US20100000170A1 - Pre-Applied Waterless Adhesive On HVAC Facings With Sealable Flange - Google Patents
Pre-Applied Waterless Adhesive On HVAC Facings With Sealable Flange Download PDFInfo
- Publication number
- US20100000170A1 US20100000170A1 US12/167,285 US16728508A US2010000170A1 US 20100000170 A1 US20100000170 A1 US 20100000170A1 US 16728508 A US16728508 A US 16728508A US 2010000170 A1 US2010000170 A1 US 2010000170A1
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- US
- United States
- Prior art keywords
- thin
- waterless
- facing
- fibrous
- layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials
- F16L59/026—Mattresses, mats, blankets or the like
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B11/00—Layered products comprising a layer of bituminous or tarry substances
- B32B11/04—Layered products comprising a layer of bituminous or tarry substances comprising such bituminous or tarry substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B11/06—Layered products comprising a layer of bituminous or tarry substances comprising such bituminous or tarry substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material of paper or cardboard
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- B32B11/10—Layered products comprising a layer of bituminous or tarry substances next to a fibrous or filamentary layer
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- B32B15/14—Layered products comprising a layer of metal next to a fibrous or filamentary layer
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- B32B19/06—Layered products comprising a layer of natural mineral fibres or particles, e.g. asbestos, mica next to a fibrous or filamentary layer
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- B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
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- B32B3/06—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by features of form at particular places, e.g. in edge regions for securing layers together; for attaching the product to another member, e.g. to a support, or to another product, e.g. groove/tongue, interlocking
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
- D04H1/4209—Inorganic fibres
- D04H1/4218—Glass fibres
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/02—Ducting arrangements
- F24F13/0263—Insulation for air ducts
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Definitions
- the present invention relates generally to rotary fiberglass insulation, and more particularly, to fibrous insulation products faced with one or more facing materials having thereon a waterless, pre-applied thin-film adhesive, including UVAC product facings with a sealable flange.
- Ducts and conduits are used to convey air in building heating, ventilation, and air conditioning (HVAC) systems. Often these ducts are formed of sheet metal, and, as a result, do not possess good thermal or acoustical properties. In order to enhance these properties, the ducts are lined with a flexible thermal and sound insulating material.
- Duct insulation used in HVAC systems typically includes a facing layer adhered to an insulation layer. Often the facing layer acts as, or is, a vapor barrier.
- the fibrous duct insulation is typically formed of a suitable organic or inorganic material such as fiberglass.
- Typical fiberglass duct boards or duct liners are constructed of a fiberglass insulation layer having a density from about 1.0 to about 7.0 pounds per cubic foot (pcf) and a thickness from about 0.5 to about 3.0 inches.
- the facing material is commonly affixed to the fibrous insulation by an adhesive.
- adhesive materials used in conjunction with fibrous insulation are set forth below.
- U.S. Pat. No. 4,738,998 to Uffner, et al. discloses thermal insulating articles that include a laminate of thermal insulation and a flexible jacket material. The insulation and the jacket material are adhered to each other by a hot melt adhesive that consists essentially of an asphalt an ethylene-vinyl acetate copolymer, and a wax.
- U.S. Pat. No. 5,106,446 to DiRado, et al. teaches a hot melt adhesive for insulation assemblies for HVAC systems that includes (1) 10-50% of an isotactic thermoplastic polybutylene-1/ethylene copolymer containing from about 5.5-10% by weight ethylene, (2) 20-50% of a tackifier, (3) 15-50% of an amorphous diluent having a softening point greater than 90° C., (4) 0-2% of an antioxidant, and (5) 0-5% of a wax.
- U.S. Pat. No. 5,277,955 to Schelhorn, et a. discloses an insulation assembly for insulating buildings.
- the insulation assembly includes a low density, binderless mineral fiber batt enclosed by an exterior layer or cover.
- the exterior layer is a heated polyethylene layer that is applied directly to the fibrous glass batt.
- the heated polyethylene serves as an adhesive layer that joins the film to the mineral fiber batt.
- U.S. Pat. No. 6,986,367 to Toas, et al. discloses an insulation product for installing around ducts that includes a fibrous insulation board and a reinforcement fabric.
- the insulation board and reinforcement fabric are laminated together using an adhesive material.
- the adhesive material may be a removable adhesive, a permanent adhesive, or a repositionable adhesive.
- suitable adhesives include water-based adhesives, hot melt glues, a liquid adhesive, or a tape.
- U.S. Patent Publication No. 2005/0031819 to Mankell, et al discloses a duct board or duct liner that is formed of (1) a fibrous material bound by a resinous binder, (2) an outer facing layer adhered to an outer surface of the insulating layer, and (3) a water repellant mat facer adhered to an interior surface of the insulating layer opposite the outer surface.
- a liquid adhesive is utilized to adhere the outer facing layer and the mat facer to the insulation layer.
- U.S. Patent Publication No. 2005/0272338 to Shaffer teaches a faced fibrous insulation product that has a mat on one or more surfaces of a fibrous insulation.
- the mat facing includes a pre-applied adhesive that is heat activated to provide adhesion to the fibrous insulation.
- a low melting point adhesive and a relatively higher temperature melting point adhesive are distributed on a surface of the mat facing and heated to a temperature above the melting point of the low melting adhesive to adhere the high melting point adhesive to the mat facing.
- Suitable low melting point adhesives include polyethylene, ethylene vinyl acetate, and other polymer adhesives.
- Examples of high melting point adhesives include polyamide adhesives and phenolic powders.
- U.S. Patent Publication No. 2005/0272338 to Shaffer discloses a faced fibrous insulation product that has a fibrous web on one or more surfaces of a fibrous insulation layer.
- the mat facing includes a pre-applied adhesive that is heat activated to provide adhesion to the fibrous insulation layer. Particles of the adhesive are distributed on a surface of the fibrous web and heated to a temperature above the temperature of the melting point of the adhesive to adhere the adhesive powder to the fibrous nonwoven web.
- suitable adhesives include polyethylene, polypropylene, ethylene vinyl acetate, polyamides, epoxies, urethane, melamine, and phenolic powders.
- U.S. Patent Publication No. 2006/0083889 to Schuckers discloses a duct board that is formed of a fibrous duct board layer, an adhesive material, and a second insulating board layer.
- the adhesive material may be any adhesive material that adheres the fibrous duct board and the second insulating board layer.
- suitable adhesives include a hot melt glue or a water-based adhesive.
- water-based adhesives are conventionally utilized to adhere the facing layer to the fibrous insulation.
- water-based adhesives present numerous problems, such as surface foil corrosion and the stimulation of trimethylamine (TMA), which produces an undesirable odor.
- TMA trimethylamine
- an enormous amount of energy is required to remove the water and cure the water-based adhesive. Accordingly, there exists a need in the art for a fibrous insulation product that can be utilized as a duct liner and which is formed using an adhesive that is easy to use, is inexpensive, requires minimal energy to cure, and eliminates the need for expensive foil tape.
- a faced insulation product that includes at least one facing layer adhered to a major surface of an insulation layer.
- the facing layer is formed of a facing material that has thereon a pre-applied waterless, thin-film adhesive.
- the waterless, thin-film adhesive is thermoplastic and heat activated.
- the waterless, thin-film adhesive is a polyethylene copolymer. Due to the thermoplastic nature of the waterless, thin-film adhesive, the facing material may advantageously be repositioned or repaired in the field by the application of heat.
- the facing material may be any facing material that is suitable for a fibrous insulation product, such as a nonwoven mat, web, or veil, or a vapor barrier.
- the waterless, thin-film adhesive reduces the time associated with curing the adhesive.
- the waterless, thin-film adhesive requires much less energy to cure than conventional water-based adhesives, which, in turn, may result in a reduction in manufacturing costs.
- the lack of water in the waterless, thin-film adhesive helps to reduce or eliminate detrimental effects to the insulation product typically caused by water-based adhesives, such as surface foil corrosion and the stimulation of trimethylamine (TMA) and its associated odor.
- TMA trimethylamine
- a first facing material is a vapor barrier positioned on a first major surface of a fibrous insulation layer and a second facing material is a non-woven fibrous web positioned on a second, opposing major surface of the fibrous insulation layer.
- the first facing layer is wider than the insulation layer and projects beyond the insulation layer along a transverse edge thereof to form a sealing flange.
- the first facing layer may be applied to the fibrous insulation layer in an offset manner such that a transverse edge of the first facing layer extends beyond a corresponding transverse edge of the fibrous insulation layer to form a male shiplap edge, from which the sealing flange extends.
- the facing materials have thereon a pre-applied waterless, thin-film adhesive.
- the waterless, thin-film adhesive is a polyethylene copolymer.
- the waterless, thin-film adhesive seals the sealing flange and thus reduces, or even eliminates, the need for foil tape or staples, which are conventionally used in the industry. Because foil tape is expensive and time consuming to apply, the use of the waterless, thin-film adhesive saves both time and money.
- the sealing flange may be securely and easily bonded in the field, such as with a hot iron, and may be repositioned due to the thermoplastic nature of the waterless, thin-film adhesive.
- a waterless, thin-film adhesive is pre-applied to a facing material to form a facing layer.
- the facing layer having the pre-applied waterless, thin-film adhesive thereon is adhered to a major surface of a fibrous insulation layer by heating the facing material and the fibrous insulation layer to a temperature at or above the melting point of the waterless, thin-film adhesive for a time sufficient to adhere the facing to the fibrous insulation layer.
- a first facing layer is adhered to a first major surface of the fibrous insulation layer and a second facing layer is adhered to a second major surface of the fibrous insulation layer.
- the first facing layer may be wider than the insulation layer to project beyond the insulation layer along a transverse edge thereof to form a sealing flange.
- the waterless, thin-film adhesive is thermoplastic and heat activated.
- the waterless, thin-film adhesive is a polyethylene copolymer.
- the waterless, thin-film adhesive may be pre-applied to a sealing flange of a duct board and sealed by the application of heat without the use of tape or staples.
- the waterless, thin-film adhesive may reduce or eliminate the use of foil tape conventionally used to seal duct sealing flanges.
- the waterless, thin-film adhesive reduces surface foil corrosion and permits a better adhesion of foil tape and duct board foil if such foil tape is utilized.
- the waterless, thin-film adhesive may be evenly or substantially evenly applied to the facer material.
- the facing material having thereon the pre-applied waterless, thin-film adhesive may advantageously be repaired or repositioned in the field with the use of a hot applicator.
- the waterless, thin-film adhesive exhibits a constant or nearly constant weight distribution across the facing.
- the waterless, thin-film adhesive is thermoplastic and heat activated.
- facing materials having thereon a pre-applied layer of the waterless, thin-film adhesive may be adhered to one or more surfaces of a fibrous insulation layer.
- the waterless, thin-film adhesive may be positioned on the facing material and adhered thereto via the application of heat.
- FIG. 1 is a schematic illustration of a facing layer formed of a fibrous web having thereon a waterless, thin-film adhesive according to one embodiment of the present invention
- FIG. 2 is a schematic illustration of a manufacturing line for producing a faced fibrous insulation product in which the faced insulation product is rolled by a roll-up device according on an exemplary embodiment of the present invention
- FIG. 3 is a schematic illustration similar to that of FIG. 2 , but showing an alternate embodiment of the manufacturing line of FIG. 2 where the faced insulation product is cut into panels according to another exemplary embodiment of the present invention
- FIG. 4 is a schematic illustration depicting an alternate embodiment of the manufacturing line of FIG. 3 in which the facer is applied to a top surface of an uncured pack of glass fibers;
- FIG. 5 is a perspective view, partially cut away, of a faced insulation product having a facing material on one major surface thereof according to at least one embodiment of the present invention
- FIG. 6A is a schematic illustration of a faced fibrous insulation product having a sealing flange extending beyond a transverse edge of the fibrous insulation layer;
- FIG. 6B is a schematic illustration of the insulation product depicted in FIG. 6A being folded and used as a duct wrap;
- FIG. 6C is a schematic illustration of a faced fibrous insulation product similar to that of FIG. 6A , but having a thinner insulation layer;
- FIG. 6D is a schematic illustration of the insulation product depicted in FIG. 6C being folded into a duct liner
- FIG. 7 is a schematic illustration of a manufacturing line for producing a faced fibrous insulation product in which the faced insulation product has a facing material on a first and second major surface according on one exemplary embodiment of the present invention
- FIG. 8 is a perspective view, partially cut away, of a faced insulation product having a facing material on two major surfaces thereof according to at least one embodiment of the present invention
- FIG. 9 is a schematic illustration depicting an alternate embodiment of the manufacturing line of FIG. 7 in which the faced insulation product is bisected and rolled into two separate rolls by roll-up devices;
- FIG. 10A is schematic illustration depicting an alternative process of forming a faced fibrous insulation product in a post-curing oven or off-line process using a heated platen to adhere the facing material to the fibrous insulation;
- FIG. 10B is a schematic illustration of an alternative process of forming a faced fibrous insulation product in a post-curing oven or off-line process using a heated roller to adhere the facing material to the fibrous insulation;
- FIG. 11 is a schematic illustration of an alternative process of forming the faced fibrous insulation product in a post-curing oven or off-line process using a heated caterpillar to adhere the facing to the fibrous insulation;
- FIG. 12 is a perspective view of a duct board according to at least one exemplary embodiment of the present invention.
- FIG. 13 is a schematic illustration of a duct board similar to that of FIG. 12 but including grooves to permit folding of the duct board into a predetermined shape according to at least one exemplary embodiment of the present invention
- FIG. 14 is a schematic illustration of a duct board folded into an air duct according to at least one exemplary embodiment of the present invention.
- FIG. 15 is a perspective view of a duct board according to at least one exemplary embodiment of the present invention, the duct board incorporating male and female shiplap edges and a sealing flange;
- FIG. 16 is a schematic illustration of a duct board similar to that shown in FIG. 15 but incorporating grooves to facilitate folding of the duct board into a predetermined shape;
- FIG. 17 is a schematic illustration of a duct board as depicted in FIG. 16 but folded into an air duct with the shiplap edges engaging at the joint between the opposing ends of the duct board.
- the present invention relates to a waterless, thin-film adhesive that is pre-applied to a facing material.
- the facing with the pre-applied adhesive may subsequently be adhered to surfaces of fibrous insulation materials to form duct boards for HVAC systems.
- the waterless, thin-film adhesive may be placed on a sealing flange of a duct board and heat sealed without the use of hand applied foil tape.
- the waterless, thin-film adhesive reduces odor potential, improves fiberglass recovery, and reduces manufacturing and production costs.
- the facing material is not particularly limited, and may be any facing material that is suitable for a fibrous insulation product, such as a nonwoven mat, web, or veil, or a vapor barrier such as a foil/skrim/Kraft (FSK), Kraft/asphalt, or polymer and foil/scrim/Kraft layers.
- FIG. 1 depicts a facer with a waterless, thin-film adhesive adhered thereto according to one embodiment of the present invention.
- the facer 12 may include a fibrous web 5 and a waterless, thin-film adhesive 7 adhered to a major surface of the fibrous web 5 .
- the fibrous web 5 may be formed from fibers such as, but not limited to, glass fibers, mineral wool, rock wool, polymer fibers, synthetic fibers, and/or natural fibers.
- fibers such as, but not limited to, glass fibers, mineral wool, rock wool, polymer fibers, synthetic fibers, and/or natural fibers.
- natural fiber is meant to indicate plant fibers extracted from any part of a plant, including, but not limited to, the stein, seeds, leaves, roots, or bast.
- the fibrous web 5 is formed of organic fibers such as rayon, polyethylene, polypropylene, nylon, polyester, and mixtures thereof. Continuous fibers and/or multi-component fibers such as bicomponent or tricomponent polymer fibers may also be utilized in forming the web 5 .
- the bicomponent fibers may be formed in a sheath-core arrangement in which the sheath is formed of first polymer fibers that substantially surround a core formed of second polymer fibers.
- the web 5 is preferably a non-woven web formed by conventional dry-laid processes, other materials such as point bonded, woven, and other non-woven materials such as needled, spunbonded, or meltblown webs may be used.
- a binder, flame-retardants, pigments, and/or other conventional additives may also be included in the fibrous web 5 .
- the web 5 may be treated with a fungicide and/or bactericide either during or after manufacturing.
- the waterless, thin-film adhesive may be heat bonded to a vapor barrier (e.g., FSK layer) and subsequently applied to a fibrous insulation product.
- a vapor barrier e.g., FSK layer
- the waterless, thin-film adhesive is thermoplastic and heat activated.
- the thickness of the waterless, thin-film adhesive is desirably as small as possible so long as the adhesive has sufficient bond strength and meets such required standards such as ASTM E84 Flame and Smoke certifications.
- the waterless, thin-film adhesive has a thickness less than or equal to about 60 microns, from about 6.0 to about 30.0 microns, or from about 10 microns to about 15 microns.
- the waterless, thin-film adhesive is applied to the facing material via the application of heat.
- the waterless, thin-film adhesive may be positioned on the facing material and then adhered to the facing material by heating the facing material with a hot plate or other suitable heating device (e.g., an oven).
- the facing material may similarly be adhered to a fibrous insulation layer by heating the facing material and the fibrous insulation to a temperature at or above the melting point of the waterless, thin-film adhesive for a time sufficient to adhere the facing to the fibrous insulation layer.
- suitable adhesives include an ethylene copolymer, polyturethane, ethylene vinyl acetate (EVA), amorphous polyolefin, polyethylene, low density polyethylene (LDPE), cellophane, polyethylene terephthalate (PETP), polyvinyl chloride (PVC) nylons, polypropylene, polystyrene, polyamides, and cellulose acetate.
- EVA ethylene vinyl acetate
- PVC polyvinyl chloride
- the waterless, thin-film adhesive may incorporate pre-engineered components to address requirements set forth according to ASTM E184 (Flame and Smoke certification), color pigmentation, static guards, and/or pre-designed scavengers.
- the lack of water in the thin-film adhesive helps to reduce odors that commonly occur with water-based, liquid adhesives. Because the thin-film adhesive is thermoplastic and heat activated, the facing may advantageously be repaired or repositioned in the field with the use of a hot applicator. Conventional adhesives are thermoset and do not allow for easy re-application of the facing layer(s). In addition, the thin-film adhesive may be evenly or substantially evenly applied to the facing material, unlike conventional liquid adhesives which are commonly unevenly applied to the facing material. Further, there is a reduction in down time due to the optimization of the application of the waterless, thin-film adhesive. Unlike the waterless, thin-film adhesive, water-based adhesives require constant monitoring. Further, the waterless, thin-film adhesive may reduce or eliminate the use of foil tape conventionally used to seal duct sealing (closing) flanges.
- the facing with the pre-applied waterless, thin-film adhesive may be applied to one or more surfaces of a fibrous insulation layer to form a faced insulation product.
- the facing provides improved surface quality, high and controlled adhesion, and is easily manufactured.
- the pre-applied facing may be input into the glass fiber forming section of a fibrous insulation production line as shown in FIG. 2 .
- Fibrous glass insulation products are generally formed of matted glass fibers bonded together by a cured thermoset polymeric material. The manufacture of glass fiber insulation products may be carried out in a continuous process by fiberizing molten glass and immediately forming a fibrous glass batt on a moving conveyor.
- glass may be melted in a tank (not shown) and supplied to a fiber forming device such as a fiberizing spinner 15 .
- the spinners 15 are rotated at high speeds. Centrifugal force causes the molten glass to pass through the holes in the circumferential sidewalls of the fiberizing spinners 15 to form glass fibers.
- Single component glass fibers of random lengths may be attenuated from the fiberizing spinners 15 and blown generally downwardly, that is, generally perpendicular to the plane of the spinners 15 , by blowers 20 positioned within a forming chamber 25 .
- the blowers 20 turn the fibers downward to form a veil or curtain 30 .
- Non-limiting examples of glass fibers that may be utilized in the present invention are described in U.S. Pat. No. 6,527,014 to Aubourg; U.S. Pat. No. 5,932,499 to Xu et al.; U.S. Pat. No. 5,523,264 to Mattison; and U.S. Pat. No. 5,055,428 to Porter, the contents of which are expressly incorporated by reference in their entirety.
- the glass fibers while in transit in the forming chamber 25 and while still hot from the drawing operation, are sprayed with an aqueous binder composition by suitable spray applicators 35 so as to result in a distribution of the binder composition throughout the formed uncured pack 40 .
- Water may also be applied to the glass fibers in the forming chamber 25 , such as by spraying, prior to the application of the binder composition to at least partially cool the glass fibers.
- the binder is desirably a low formaldehyde binder composition, such as a polycarboxylic based binder, a polyaciylic acid glycerol (PAG) binder, or a polyaciylic acid triethanolamine (PAT binder).
- Suitable polycarboxy binder compositions for use in the instant invention include a polycarboxy polymer, a crosslinking agent, and, optionally, a catalyst.
- Such binders arc known for use in connection with rotary fiberglass insulation. Examples of such binder technology are found in U.S. Pat. Nos.
- the binder may be present in an amount from about 2% to about 25% by weight of the total product, and preferably from about 5% to about 20% by weight of the total product, and most preferably from about 10% to about 18% by weight of the total product.
- the glass fibers having the uncured resinous binder adhered thereto may be gathered and formed into an uncured pack 40 on the facer 12 on an endless forming conveyor 45 within the forming chamber 25 with the aid of a vacuum (not shown) drawn through the insulation pack 40 from below the forming conveyor 45 .
- facers 12 , 16 are facing materials having thereon a pre-applied waterless, thin-film adhesive as described herein.
- the facer 12 is supplied to the conveyor 45 by roll 90 .
- the residual heat from the glass fibers and the flow of air through the insulation pack 40 and facer 12 during the forming operation are generally sufficient to volatilize a majority of the water from the binder before the glass fibers exit the forming chamber 25 , thereby leaving the remaining components of the binder on the fibers as a viscous or semi-viscous high-solids liquid.
- the coated uncured pack 40 which is in a compressed state due to the flow of air through the pack 40 in the forming chamber 25 , and the facer 12 are then transferred out of the forming chamber 25 under exit roller 50 to a transfer zone 55 where the insulation pack 40 vertically expands due to the resiliency of the glass fibers.
- the expanded uncured pack 40 and facer 12 are then heated, such as by conveying the pack 40 through a curing oven 60 where heated air is blown through the insulation pack 40 and facer 12 to evaporate any remaining water in the binder, cure the binder and the adhesive, rigidly bond the fibers together in the insulation pack 40 , and adhere the facer 12 to the insulation pack 40 .
- the facer 12 and the insulation pack 40 are heated to a temperature at or above the temperature of the above the waterless, thin-film adhesive for a time period sufficient to at least partially melt the waterless, thin-film adhesive and bond the adhesive to the insulation pack 40 .
- heated air is forced though a fan 75 through the lower oven conveyor 70 , the insulation pack 40 and the facer 12 , the upper oven conveyor 65 , and out of the curing oven 60 through an exhaust apparatus 80 .
- the cured binder imparts strength and resiliency to the faced insulation product 10 . It is to be appreciated that the drying and curing of the binder and the waterless, thin-film adhesive may be carried out in either one or two different steps.
- the uncured pack 40 may be compressed by upper and lower foraminous oven conveyors 65 , 70 to form the faced fibrous insulation product 10 having a predetermined thickness.
- the faced fibrous insulation 10 then exits the curing oven 60 and may be rolled by roll-up device 82 for storage and/or shipment.
- the faced fibrous insulation product 10 may subsequently be unrolled and cut or die pressed to form fibrous insulation parts (e.g., duct boards).
- the faced fibrous insulation product 10 may be cut to a predetermined length by a cutting device such as a blade or knife 83 to form panels 84 of the faced fibrous insulation.
- the panels 84 may be stacked or bagged by a packaging apparatus 86 If desired, channels or grooves, such as v-shaped grooves, may be formed in the inner surface of the fibrous insulation product 10 for folding or bending the fibrous insulation product 10 into a duct liner, as is discussed in more detail below.
- an uncured pack 40 is formed as described in detail above with respect to FIG. 2 .
- a facer 12 is applied to a top surface of the uncured pack 40 from roll 90 .
- the facer 12 and the uncured pack 40 enter the curing oven 60 where heated air is forced though a fan 75 through the lower oven conveyor 70 , the insulation pack 40 and the facer 12 , the upper oven conveyor 65 , and out of the curing oven 60 through an exhaust apparatus 80 .
- the faced fibrous insulation product 10 exits the oven 60 , it may be cut into panels 84 by the cutting device 83 and collected by the gathering apparatus 86 .
- the faced fibrous insulation product 10 may be rolled by a roll-up device (not illustrated) for storage and/or shipment.
- the faced insulation product 10 formed by the processes depicted in FIGS. 2 , 3 , and 4 include a fibrous insulation layer 14 and a facing material 12 affixed to a major surface of the insulation layer 14 .
- the facer 12 may be applied to one surface of the fibrous insulation 14 where the facer 12 is larger than the fibrous insulation 14 and drapes over the edges of the insulation layer 14 to face one or more of the minor surfaces of the fibrous insulation 14 .
- the faced insulation product 10 may be utilized as a duct liner or duct wrap.
- a duct liner or duct wrap may be formed from the insulation products described above where the insulation layer 14 has thereon a single facer 12 that is wider than the insulation layer 14 along a transverse edge to form a flange 134 .
- the facer 12 is a foil/scrim/Kraft layer.
- the duct wrap 145 may be formed of a facer 12 including a flange 134 adhered to an insulation layer 14 by a waterless, thin-film adhesive 125 .
- the duct wrap 145 may be wrapped around a sheet metal duct 137 and the edges of the duct wrap 145 sealed by the seating flange 134 .
- the sealing flange 134 may be adhered or bonded to the adjoining surface of the facing layer 12 (e.g., a foil/scrim/Kraft layer) by heat and pressure due to the pre-applied waterless, thin-film adhesive 125 .
- the flange 134 is depicted at the middle of a wall of the metal duct 137 , one skilled in the art will recognize that the location of the sealing flange 134 on the final assembly, including the duct liner 147 described below, could be at a corner of the duct 137 , or at other locations, depending on the location of the grooves 144 within the insulation product 10 .
- a duct liner 147 having a facing 12 with a flange 134 adhered to a fibrous insulation layer 14 is illustrated.
- the duct liner 147 may be folded into a shape substantially similar to the shape of the duct into which it is to be inserted (e.g. a substantially square shape as shown in FIG. 6 d ) and inserted into a sheet metal to form a duct assembly (not illustrated).
- the duct wrap 145 and duct liner 147 enhance the thermal efficiency of duct work in a building and reduce noise associated with the movement of air through the air duct.
- facing materials may be applied to both major surfaces of the fibrous insulation 14 , as shown in FIG. 7 .
- molten glass (not illustrated) is supplied to fiberizing spinners 15 that are rotated at high speeds to force the molten glass through holes in the circumferential sidewalls of the fiberizing spinners 15 and form glass fibers.
- Blowers 20 direct a gas stream in a substantially downward direction to impinge the attenuated fibers, turning them downward, to form a veil or curtain 30 .
- the fibers may be sprayed with an aqueous binder by suitable spray applicators 35 .
- the glass fibers having the uncured resinous binder adhered thereto may then be gathered and formed into an uncured pack 40 on a perforated endless conveyor 45 within the forming chamber 25 .
- the coated uncured pack 40 which is in a compressed state due to the flow of air through the pack 40 in the forming chamber 25 is then transferred out of the forming chamber 25 under exit roller 50 to a transfer zone 55 where the insulation pack 40 vertically expands due to the resiliency of the glass fibers.
- facing materials 12 , 16 are positioned on the top and bottom major surface of the uncured pack.
- the facing materials 12 , 16 may be the same or different.
- one of the facing layers may be a fibrous web and the other facing layer may be a vapor barrier.
- the facing materials 12 , 16 are fed to the uncured pack 40 from rolls 90 and 92 , respectively.
- the expanded uncured pack 40 and facers 12 , 16 are then heated in a curing oven 60 where heated air is blown through the insulation pack 40 and facers 12 , 16 .
- facer 12 may alternatively be supplied to the conveyor 45 prior to the formation of the uncured pack 40 such that the fibers formed from the spinners 15 are deposited onto the facer 12 .
- Heated air is forced though a fan 75 through the lower oven conveyor 70 , the insulation pack 40 and the facers 12 , 16 , the upper oven conveyor 65 , and out of the curing oven 60 through an exhaust apparatus 80 .
- the uncured pack 40 may be compressed by upper and lower foraminous oven conveyors 65 , 70 to form a faced fibrous insulation product 10 having a predetermined thickness.
- the double-faced fibrous insulation product 10 then exits the curing oven 60 and may be rolled by roll-up device 82 for storage and/or shipment.
- the faced fibrous insulation product 10 may subsequently be unrolled and cut or die pressed to form fibrous insulation parts.
- Channels or grooves, such as v-shaped grooves, may optionally be formed in the inner surface of the fibrous insulation product 10 for folding or bending the fibrous insulation product 10 into a duct liner.
- FIG. 8 depicts such a double-faced fibrous insulation product 10 in which a facer 12 is positioned on a first major surface of the fibrous insulation 14 and a second facing material 16 is positioned on a second major surface of the fibrous insulation 14 .
- the presence of water, dust, and/or other microbial nutrients in the faced insulation product 10 may support the growth and proliferation of microbial organisms. Bacterial and/or mold growth in the insulation product may cause odor and discoloration of the insulation product and deterioration of the vapor barrier properties of Kraft paper.
- the facing materials 12 , 16 and/or the fibrous insulation 14 may be treated with one or more anti-microbial agents and/or biocides.
- the anti-microbial agents and/or biocides may be added during manufacture or in a post manufacture process of the fibrous insulation product.
- flame retardants, pigments, colorants, and/or other conventional additives may be included in the faced insulation product 10 .
- waterless, thin-film adhesive to the first and second facing layers 12 , 16 reduces the time associated with drying and bonding (curing) the adhesive, both to the facing layers 12 , 16 and to the fibrous insulation product 10 .
- Conventional adhesives are water-based and require an enormous amount of heat energy to flash off the water during the curing of the adhesive.
- the waterless, thin-film adhesive requires much less energy to cure, which may result in a reduction in manufacturing costs.
- the lack of water in the waterless, thin-film adhesive helps to reduce or eliminate the detrimental effects to the insulation typically caused by water-based adhesives, such as, but not limited, to surface foil corrosion and the stimulation of trimethylamine (TMA) and its associated odor.
- TMA trimethylamine
- the waterless, thin-film adhesive exhibits a constant or nearly constant weight distribution across the facing, unlike conventional water-based adhesives which commonly have inconsistent weight across the facing material due to equipment malfunction or the inherent uneven application of the water-based adhesive.
- the reduction of surface foil corrosion permits a better adhesion of tape and duct board foil, if such tape is utilized.
- an uncured pack 40 is formed as described in detail above with respect to FIG. 7 .
- facers 12 , 16 are applied to a top and bottom major surface of the uncured pack 40 from rolls 90 , 92 .
- facer 12 may instead be supplied to the conveyor 45 prior to the formation of the uncured pack 40 such that the fibers formed from the spinners 15 are deposited onto the facer 12 .
- the facers 12 , 16 and the uncured pack 40 enter the curing oven 60 where heated air is forced though a fan 75 through the lower oven conveyor 70 , the insulation pack 40 and the facers 12 , 16 , the upper oven conveyor 65 , and out of the curing oven 60 through an exhaust apparatus 80 .
- the double-faced fibrous insulation product 10 may be bisected by a bisect saw 94 or other suitable cutting device and rolled into two rolls by an upper roll-up device 96 and a lower roll-tip device 98 .
- the product thus formed is an insulation product having thereon a facer 12 on one major surface thereof, such as is depicted in FIG. 5 .
- FIGS. 10A and 10B show alternate methods of forming the faced insulation product 10 in a post-curing or off-line process using a heated platen 100 ( FIG. 10A ) and a heated roller 102 ( FIG. 10B ).
- the facing material 12 is unrolled from roll 90 onto the cured insulation layer 14 .
- the heated platen 100 or heated roller 102 at least partially melts the waterless, thin-film adhesive that has been pre-applied to the facing material as described above to adhere the facer 12 onto the insulation layer 14 .
- FIG. 11 illustrates an alternative post-cure method of forming the double-faced fibrous insulation product 10 utilizing a heated caterpillar 110 .
- the heated caterpillar 110 has a heated upper belt 112 that rotates around a first upper belt roller 114 and a second upper belt roller 116 to compress the fibrous insulation layer 14 against a heated lower belt 120 that rotates around a first lower belt roller 122 and a second lower belt roller 124 .
- the upper belt 112 presses facing 12 to an upper surface of the cured fibrous insulation layer 14 and the lower belt 120 presses facing 16 to a lower surface of the insulation layer 14 for a time sufficient to heat the waterless, thin-film adhesives to adhere facing layers 12 , 16 to the fibrous layer 14 and form the fibrous insulation product 10 .
- the fibrous insulation product 10 is a duct board having facing materials on first and second major surfaces of an insulation layer, a sealing flange, and optionally, male and female shiplap edges.
- the facing materials are formed of an outer surface layer, such as, but not limited to, a vapor barrier, and an inner surface layer formed of a nonwoven fibrous web, veil, or mat.
- a duct board 128 according to the present invention is depicted in FIGS. 12-14 .
- a first facing layer 130 is a vapor barrier positioned on a first major surface of the fibrous insulation layer 14 and is affixed to the first major surface by a waterless, thin-film adhesive 125 .
- a second facing layer 132 may be a fibrous web, such as the web described in detail above, which is affixed to a second major surface of the fibrous insulation layer 14 by a waterless thin-film adhesive 127 .
- the waterless, thin-film adhesives 125 , 127 may be the same or different, but are both thermoplastic in nature. It is to be appreciated that the vapor barrier and the fibrous web forming the first and second facing layers 130 , 132 each correspond to one of facer 12 or facer 16 described in detail above.
- the duct board 128 may be formed into an air duct 135 by folding the duct board 128 into a generally rectangular shape such that the second facing layer 132 faces an interior portion thereof and the first facing layer (e.g., vapor barrier) is positioned on an exterior surface of the air duct 135 .
- the air duct may be formed into a non-square shape, such as a rectangular, round, or oval air duct, as would be understood by those of skill in the art.
- the second facing layer 132 facilitates air flow through the duct and reduces or eliminates the occurrence of flyaway glass fibers from the insulation layer 14 .
- grooves 144 may be cut or otherwise formed into the duct board 128 at even intervals where the duct board 128 is to be folded to permit the duct board 128 to be folded along the grooves 144 and formed into the air duct 135 .
- the sealing flange 134 may be adhered or bonded to the adjoining surface of the first facing layer 132 (e.g., a foil/scrim/Kraft layer) by heat and pressure due to the pre-applied waterless, thin-film adhesive 125 .
- the first facing layer 130 is wider than the insulation layer 14 and projects beyond the insulation layer 14 along a transverse edge to form a sealing flange 134 extending from a male shiplap edge 140 .
- the first facing layer 130 may be applied to the fibrous layer 14 in an offset manner such that a transverse edge of the first facing layer 130 extends beyond a corresponding transverse edge of the fibrous insulation layer 14 to form the male shiplap edge 140 .
- An opposing transverse edge of the insulation layer 14 is thus formed into a female shiplap edge 142 .
- the duct board 128 may also be formed such that one or both of the longitudinal edges also form a shiplap edge (not depicted). As illustrated in FIG. 16 , grooves 144 may be cut into the duct board to facilitate bending of the duct board into an air duct 135 .
- the male and female shiplap edges 140 , 142 are mated and sealing flange 134 covers the interface of the male and female shiplap edges 140 , 142 .
- the sealing flange 134 may be adhered or bonded to the adjoining surface of the first facing layer 132 (e.g., a foil/scrim/Kraft layer) by heat and pressure due to the pre-applied waterless, thin-film adhesive 125 .
- the waterless, thin-film adhesive seals the sealing flange 134 without tape or staples and thus reduces, or even eliminates, the need for foil tape or staples, which are conventionally used in the industry. Because foil tape is expensive and time consuming to apply, the use of the waterless, thin-film adhesive saves both time and money. Additionally, the sealing flange 134 may be securely and easily bonded in the field, such as with a hot iron, and may be repositioned due to the thermoplastic nature of the waterless, thin-film adhesive.
Abstract
A fibrous insulation product having at least one facing material adhered thereto is provided. The facing includes a pre-applied waterless, thin-film adhesive that is thermoplastic and heat activated. Accordingly, the facing may be repaired or repositioned in the field with the use of a hot applicator. In at least one embodiment, the fibrous insulation product is a duct board formed of an insulation layer with a vapor barrier adhered to a first major surface and a fibrous web adhered to a second major surface. The vapor barrier is preferably wider than the insulation layer to form a sealing flange. The waterless, thin-film adhesive may be placed on a sealing flange and heat sealed without the use of hand applied foil tape. The waterless, thin-film adhesive reduces odor potential and improves fiberglass recovery. In addition, the waterless, thin-film adhesive requires less energy to cure than a water-based adhesive, thereby reducing cost.
Description
- The present invention relates generally to rotary fiberglass insulation, and more particularly, to fibrous insulation products faced with one or more facing materials having thereon a waterless, pre-applied thin-film adhesive, including UVAC product facings with a sealable flange.
- Ducts and conduits are used to convey air in building heating, ventilation, and air conditioning (HVAC) systems. Often these ducts are formed of sheet metal, and, as a result, do not possess good thermal or acoustical properties. In order to enhance these properties, the ducts are lined with a flexible thermal and sound insulating material. Duct insulation used in HVAC systems typically includes a facing layer adhered to an insulation layer. Often the facing layer acts as, or is, a vapor barrier. The fibrous duct insulation is typically formed of a suitable organic or inorganic material such as fiberglass. Typical fiberglass duct boards or duct liners are constructed of a fiberglass insulation layer having a density from about 1.0 to about 7.0 pounds per cubic foot (pcf) and a thickness from about 0.5 to about 3.0 inches. The facing material is commonly affixed to the fibrous insulation by an adhesive. Non-limiting examples of adhesive materials used in conjunction with fibrous insulation are set forth below.
- U.S. Pat. No. 4,738,998 to Uffner, et al. discloses thermal insulating articles that include a laminate of thermal insulation and a flexible jacket material. The insulation and the jacket material are adhered to each other by a hot melt adhesive that consists essentially of an asphalt an ethylene-vinyl acetate copolymer, and a wax.
- U.S. Pat. No. 5,106,446 to DiRado, et al. teaches a hot melt adhesive for insulation assemblies for HVAC systems that includes (1) 10-50% of an isotactic thermoplastic polybutylene-1/ethylene copolymer containing from about 5.5-10% by weight ethylene, (2) 20-50% of a tackifier, (3) 15-50% of an amorphous diluent having a softening point greater than 90° C., (4) 0-2% of an antioxidant, and (5) 0-5% of a wax.
- U.S. Pat. No. 5,277,955 to Schelhorn, et a., discloses an insulation assembly for insulating buildings. The insulation assembly includes a low density, binderless mineral fiber batt enclosed by an exterior layer or cover. In one embodiment, the exterior layer is a heated polyethylene layer that is applied directly to the fibrous glass batt. The heated polyethylene serves as an adhesive layer that joins the film to the mineral fiber batt.
- U.S. Pat. No. 6,986,367 to Toas, et al. discloses an insulation product for installing around ducts that includes a fibrous insulation board and a reinforcement fabric. The insulation board and reinforcement fabric are laminated together using an adhesive material. The adhesive material may be a removable adhesive, a permanent adhesive, or a repositionable adhesive. Examples of suitable adhesives include water-based adhesives, hot melt glues, a liquid adhesive, or a tape.
- U.S. Patent Publication No. 2005/0031819 to Mankell, et al discloses a duct board or duct liner that is formed of (1) a fibrous material bound by a resinous binder, (2) an outer facing layer adhered to an outer surface of the insulating layer, and (3) a water repellant mat facer adhered to an interior surface of the insulating layer opposite the outer surface. A liquid adhesive is utilized to adhere the outer facing layer and the mat facer to the insulation layer.
- U.S. Patent Publication No. 2005/0272338 to Shaffer teaches a faced fibrous insulation product that has a mat on one or more surfaces of a fibrous insulation. The mat facing includes a pre-applied adhesive that is heat activated to provide adhesion to the fibrous insulation. A low melting point adhesive and a relatively higher temperature melting point adhesive are distributed on a surface of the mat facing and heated to a temperature above the melting point of the low melting adhesive to adhere the high melting point adhesive to the mat facing. Suitable low melting point adhesives include polyethylene, ethylene vinyl acetate, and other polymer adhesives. Examples of high melting point adhesives include polyamide adhesives and phenolic powders.
- U.S. Patent Publication No. 2005/0272338 to Shaffer discloses a faced fibrous insulation product that has a fibrous web on one or more surfaces of a fibrous insulation layer. The mat facing includes a pre-applied adhesive that is heat activated to provide adhesion to the fibrous insulation layer. Particles of the adhesive are distributed on a surface of the fibrous web and heated to a temperature above the temperature of the melting point of the adhesive to adhere the adhesive powder to the fibrous nonwoven web. Examples of suitable adhesives include polyethylene, polypropylene, ethylene vinyl acetate, polyamides, epoxies, urethane, melamine, and phenolic powders.
- U.S. Patent Publication No. 2006/0083889 to Schuckers discloses a duct board that is formed of a fibrous duct board layer, an adhesive material, and a second insulating board layer. The adhesive material may be any adhesive material that adheres the fibrous duct board and the second insulating board layer. Examples of suitable adhesives include a hot melt glue or a water-based adhesive.
- Although there are numerous types of adhesives known in the art water-based adhesives are conventionally utilized to adhere the facing layer to the fibrous insulation. However, water-based adhesives present numerous problems, such as surface foil corrosion and the stimulation of trimethylamine (TMA), which produces an undesirable odor. In addition, an enormous amount of energy is required to remove the water and cure the water-based adhesive. Accordingly, there exists a need in the art for a fibrous insulation product that can be utilized as a duct liner and which is formed using an adhesive that is easy to use, is inexpensive, requires minimal energy to cure, and eliminates the need for expensive foil tape.
- It is an object of the present invention to provide a faced insulation product that includes at least one facing layer adhered to a major surface of an insulation layer. The facing layer is formed of a facing material that has thereon a pre-applied waterless, thin-film adhesive. The waterless, thin-film adhesive is thermoplastic and heat activated. In at least one embodiment, the waterless, thin-film adhesive is a polyethylene copolymer. Due to the thermoplastic nature of the waterless, thin-film adhesive, the facing material may advantageously be repositioned or repaired in the field by the application of heat. The facing material may be any facing material that is suitable for a fibrous insulation product, such as a nonwoven mat, web, or veil, or a vapor barrier. Application of the waterless, thin-film adhesive to the facing layer(s) reduces the time associated with curing the adhesive. In particular, the waterless, thin-film adhesive requires much less energy to cure than conventional water-based adhesives, which, in turn, may result in a reduction in manufacturing costs. Additionally, the lack of water in the waterless, thin-film adhesive helps to reduce or eliminate detrimental effects to the insulation product typically caused by water-based adhesives, such as surface foil corrosion and the stimulation of trimethylamine (TMA) and its associated odor.
- It is another object of the present invention to provide a fibrous duct board that has facing materials on first and second major surfaces of an insulation layer, a sealing flange, and optionally, male and female shiplap edges. In one exemplary embodiment, a first facing material is a vapor barrier positioned on a first major surface of a fibrous insulation layer and a second facing material is a non-woven fibrous web positioned on a second, opposing major surface of the fibrous insulation layer. Desirably, the first facing layer is wider than the insulation layer and projects beyond the insulation layer along a transverse edge thereof to form a sealing flange. In addition, the first facing layer may be applied to the fibrous insulation layer in an offset manner such that a transverse edge of the first facing layer extends beyond a corresponding transverse edge of the fibrous insulation layer to form a male shiplap edge, from which the sealing flange extends. The facing materials have thereon a pre-applied waterless, thin-film adhesive. In a preferred embodiment, the waterless, thin-film adhesive is a polyethylene copolymer. The waterless, thin-film adhesive seals the sealing flange and thus reduces, or even eliminates, the need for foil tape or staples, which are conventionally used in the industry. Because foil tape is expensive and time consuming to apply, the use of the waterless, thin-film adhesive saves both time and money. Additionally, the sealing flange may be securely and easily bonded in the field, such as with a hot iron, and may be repositioned due to the thermoplastic nature of the waterless, thin-film adhesive.
- It is yet another object of the present invention to provide a method of forming a fibrous insulation product such as a duct board, duct liner, or duct wrap. A waterless, thin-film adhesive is pre-applied to a facing material to form a facing layer. The facing layer having the pre-applied waterless, thin-film adhesive thereon is adhered to a major surface of a fibrous insulation layer by heating the facing material and the fibrous insulation layer to a temperature at or above the melting point of the waterless, thin-film adhesive for a time sufficient to adhere the facing to the fibrous insulation layer. In exemplary embodiments, a first facing layer is adhered to a first major surface of the fibrous insulation layer and a second facing layer is adhered to a second major surface of the fibrous insulation layer. The first facing layer may be wider than the insulation layer to project beyond the insulation layer along a transverse edge thereof to form a sealing flange. The waterless, thin-film adhesive is thermoplastic and heat activated. In preferred embodiments, the waterless, thin-film adhesive is a polyethylene copolymer.
- It is an advantage of the present invention that the waterless, thin-film adhesive may be pre-applied to a sealing flange of a duct board and sealed by the application of heat without the use of tape or staples.
- It is another advantage of the present invention that less energy is required to cure the waterless, thin-film adhesive compared to water-based adhesives.
- It is yet another advantage of the present invention that the waterless, thin-film adhesive may reduce or eliminate the use of foil tape conventionally used to seal duct sealing flanges.
- It is also an advantage of the present invention that the waterless, thin-film adhesive reduces surface foil corrosion and permits a better adhesion of foil tape and duct board foil if such foil tape is utilized.
- It is still another advantage of the present invention that the waterless, thin-film adhesive may be evenly or substantially evenly applied to the facer material.
- It is a further advantage of the present invention that the facing material having thereon the pre-applied waterless, thin-film adhesive may advantageously be repaired or repositioned in the field with the use of a hot applicator.
- It is yet another advantage of the present invention that the waterless, thin-film adhesive exhibits a constant or nearly constant weight distribution across the facing.
- It is a feature of the present invention that the waterless, thin-film adhesive is thermoplastic and heat activated.
- It is another feature of the present invention that the lack of water in the waterless, thin-film adhesive reduces odors that commonly occur with water-based, liquid adhesives.
- It is a further feature of the present invention that facing materials having thereon a pre-applied layer of the waterless, thin-film adhesive may be adhered to one or more surfaces of a fibrous insulation layer.
- It is yet another feature of the present invention that the waterless, thin-film adhesive may be positioned on the facing material and adhered thereto via the application of heat.
- The foregoing and other objects, features, and advantages of the invention will appear more fully hereinafter from a consideration of the detailed description that follows. It is to be expressly understood, however, that the drawings are for illustrative purposes and are not to be construed as defining the limits of the invention.
- The advantages of this invention will be apparent upon consideration of the following detailed disclosure of the invention, especially when taken in conjunction with the accompanying drawings wherein:
-
FIG. 1 is a schematic illustration of a facing layer formed of a fibrous web having thereon a waterless, thin-film adhesive according to one embodiment of the present invention; -
FIG. 2 is a schematic illustration of a manufacturing line for producing a faced fibrous insulation product in which the faced insulation product is rolled by a roll-up device according on an exemplary embodiment of the present invention; -
FIG. 3 is a schematic illustration similar to that ofFIG. 2 , but showing an alternate embodiment of the manufacturing line ofFIG. 2 where the faced insulation product is cut into panels according to another exemplary embodiment of the present invention; -
FIG. 4 is a schematic illustration depicting an alternate embodiment of the manufacturing line ofFIG. 3 in which the facer is applied to a top surface of an uncured pack of glass fibers; -
FIG. 5 is a perspective view, partially cut away, of a faced insulation product having a facing material on one major surface thereof according to at least one embodiment of the present invention; -
FIG. 6A is a schematic illustration of a faced fibrous insulation product having a sealing flange extending beyond a transverse edge of the fibrous insulation layer; -
FIG. 6B is a schematic illustration of the insulation product depicted inFIG. 6A being folded and used as a duct wrap; -
FIG. 6C is a schematic illustration of a faced fibrous insulation product similar to that ofFIG. 6A , but having a thinner insulation layer; -
FIG. 6D is a schematic illustration of the insulation product depicted inFIG. 6C being folded into a duct liner; -
FIG. 7 is a schematic illustration of a manufacturing line for producing a faced fibrous insulation product in which the faced insulation product has a facing material on a first and second major surface according on one exemplary embodiment of the present invention; -
FIG. 8 is a perspective view, partially cut away, of a faced insulation product having a facing material on two major surfaces thereof according to at least one embodiment of the present invention; -
FIG. 9 is a schematic illustration depicting an alternate embodiment of the manufacturing line ofFIG. 7 in which the faced insulation product is bisected and rolled into two separate rolls by roll-up devices; -
FIG. 10A is schematic illustration depicting an alternative process of forming a faced fibrous insulation product in a post-curing oven or off-line process using a heated platen to adhere the facing material to the fibrous insulation; -
FIG. 10B is a schematic illustration of an alternative process of forming a faced fibrous insulation product in a post-curing oven or off-line process using a heated roller to adhere the facing material to the fibrous insulation; -
FIG. 11 is a schematic illustration of an alternative process of forming the faced fibrous insulation product in a post-curing oven or off-line process using a heated caterpillar to adhere the facing to the fibrous insulation; -
FIG. 12 is a perspective view of a duct board according to at least one exemplary embodiment of the present invention; -
FIG. 13 is a schematic illustration of a duct board similar to that ofFIG. 12 but including grooves to permit folding of the duct board into a predetermined shape according to at least one exemplary embodiment of the present invention; -
FIG. 14 is a schematic illustration of a duct board folded into an air duct according to at least one exemplary embodiment of the present invention; -
FIG. 15 is a perspective view of a duct board according to at least one exemplary embodiment of the present invention, the duct board incorporating male and female shiplap edges and a sealing flange; -
FIG. 16 is a schematic illustration of a duct board similar to that shown inFIG. 15 but incorporating grooves to facilitate folding of the duct board into a predetermined shape; and -
FIG. 17 is a schematic illustration of a duct board as depicted inFIG. 16 but folded into an air duct with the shiplap edges engaging at the joint between the opposing ends of the duct board. - Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the all to which the invention belongs. Although any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention, the preferred methods and materials are described herein. All references cited herein, including published or corresponding U.S. or foreign patent applications, issued U.S. or foreign patents, and any other references, are each incorporated by reference in their entireties, including all data, tables, figures, and text presented in the cited references.
- In the drawings, the thickness of the lines, layers, and regions may be exaggerated for clarity. It is to be noted that like numbers found throughout the figures denote like elements. It will be understood that when an element is referred to as being “on,” another element, it can be directly on or against the other element or intervening elements may be present. The terms “facing” and “facing material” may be used interchangeably herein.
- The present invention relates to a waterless, thin-film adhesive that is pre-applied to a facing material. The facing with the pre-applied adhesive may subsequently be adhered to surfaces of fibrous insulation materials to form duct boards for HVAC systems. In addition, the waterless, thin-film adhesive may be placed on a sealing flange of a duct board and heat sealed without the use of hand applied foil tape. The waterless, thin-film adhesive reduces odor potential, improves fiberglass recovery, and reduces manufacturing and production costs.
- The facing material is not particularly limited, and may be any facing material that is suitable for a fibrous insulation product, such as a nonwoven mat, web, or veil, or a vapor barrier such as a foil/skrim/Kraft (FSK), Kraft/asphalt, or polymer and foil/scrim/Kraft layers.
FIG. 1 depicts a facer with a waterless, thin-film adhesive adhered thereto according to one embodiment of the present invention. As shown inFIG. 1 , thefacer 12 may include afibrous web 5 and a waterless, thin-film adhesive 7 adhered to a major surface of thefibrous web 5. Thefibrous web 5 may be formed from fibers such as, but not limited to, glass fibers, mineral wool, rock wool, polymer fibers, synthetic fibers, and/or natural fibers. As used in this application, the term “natural fiber” is meant to indicate plant fibers extracted from any part of a plant, including, but not limited to, the stein, seeds, leaves, roots, or bast. Desirably, thefibrous web 5 is formed of organic fibers such as rayon, polyethylene, polypropylene, nylon, polyester, and mixtures thereof. Continuous fibers and/or multi-component fibers such as bicomponent or tricomponent polymer fibers may also be utilized in forming theweb 5. The bicomponent fibers may be formed in a sheath-core arrangement in which the sheath is formed of first polymer fibers that substantially surround a core formed of second polymer fibers. Although theweb 5 is preferably a non-woven web formed by conventional dry-laid processes, other materials such as point bonded, woven, and other non-woven materials such as needled, spunbonded, or meltblown webs may be used. A binder, flame-retardants, pigments, and/or other conventional additives may also be included in thefibrous web 5. Optionally, theweb 5 may be treated with a fungicide and/or bactericide either during or after manufacturing. Similarly, the waterless, thin-film adhesive may be heat bonded to a vapor barrier (e.g., FSK layer) and subsequently applied to a fibrous insulation product. - The waterless, thin-film adhesive is thermoplastic and heat activated. The thickness of the waterless, thin-film adhesive is desirably as small as possible so long as the adhesive has sufficient bond strength and meets such required standards such as ASTM E84 Flame and Smoke certifications. In exemplary embodiments, the waterless, thin-film adhesive has a thickness less than or equal to about 60 microns, from about 6.0 to about 30.0 microns, or from about 10 microns to about 15 microns. The waterless, thin-film adhesive is applied to the facing material via the application of heat. For instance, the waterless, thin-film adhesive may be positioned on the facing material and then adhered to the facing material by heating the facing material with a hot plate or other suitable heating device (e.g., an oven). The facing material may similarly be adhered to a fibrous insulation layer by heating the facing material and the fibrous insulation to a temperature at or above the melting point of the waterless, thin-film adhesive for a time sufficient to adhere the facing to the fibrous insulation layer. Non-limiting examples of suitable adhesives include an ethylene copolymer, polyturethane, ethylene vinyl acetate (EVA), amorphous polyolefin, polyethylene, low density polyethylene (LDPE), cellophane, polyethylene terephthalate (PETP), polyvinyl chloride (PVC) nylons, polypropylene, polystyrene, polyamides, and cellulose acetate. Additionally, the waterless, thin-film adhesive may incorporate pre-engineered components to address requirements set forth according to ASTM E184 (Flame and Smoke certification), color pigmentation, static guards, and/or pre-designed scavengers.
- The lack of water in the thin-film adhesive helps to reduce odors that commonly occur with water-based, liquid adhesives. Because the thin-film adhesive is thermoplastic and heat activated, the facing may advantageously be repaired or repositioned in the field with the use of a hot applicator. Conventional adhesives are thermoset and do not allow for easy re-application of the facing layer(s). In addition, the thin-film adhesive may be evenly or substantially evenly applied to the facing material, unlike conventional liquid adhesives which are commonly unevenly applied to the facing material. Further, there is a reduction in down time due to the optimization of the application of the waterless, thin-film adhesive. Unlike the waterless, thin-film adhesive, water-based adhesives require constant monitoring. Further, the waterless, thin-film adhesive may reduce or eliminate the use of foil tape conventionally used to seal duct sealing (closing) flanges.
- The facing with the pre-applied waterless, thin-film adhesive may be applied to one or more surfaces of a fibrous insulation layer to form a faced insulation product. The facing provides improved surface quality, high and controlled adhesion, and is easily manufactured. The pre-applied facing may be input into the glass fiber forming section of a fibrous insulation production line as shown in
FIG. 2 . It is to be appreciated that although glass fiber insulation is discussed herein, mineral wool, rock wool, polymer fibers, synthetic fibers, and/or natural fibers may alternatively or additionally be utilized in forming the insulation. Fibrous glass insulation products are generally formed of matted glass fibers bonded together by a cured thermoset polymeric material. The manufacture of glass fiber insulation products may be carried out in a continuous process by fiberizing molten glass and immediately forming a fibrous glass batt on a moving conveyor. - Turning to
FIG. 2 , glass may be melted in a tank (not shown) and supplied to a fiber forming device such as afiberizing spinner 15. Thespinners 15 are rotated at high speeds. Centrifugal force causes the molten glass to pass through the holes in the circumferential sidewalls of the fiberizingspinners 15 to form glass fibers. Single component glass fibers of random lengths may be attenuated from the fiberizingspinners 15 and blown generally downwardly, that is, generally perpendicular to the plane of thespinners 15, byblowers 20 positioned within a formingchamber 25. Theblowers 20 turn the fibers downward to form a veil orcurtain 30. Non-limiting examples of glass fibers that may be utilized in the present invention are described in U.S. Pat. No. 6,527,014 to Aubourg; U.S. Pat. No. 5,932,499 to Xu et al.; U.S. Pat. No. 5,523,264 to Mattison; and U.S. Pat. No. 5,055,428 to Porter, the contents of which are expressly incorporated by reference in their entirety. - The glass fibers, while in transit in the forming
chamber 25 and while still hot from the drawing operation, are sprayed with an aqueous binder composition bysuitable spray applicators 35 so as to result in a distribution of the binder composition throughout the formeduncured pack 40. Water may also be applied to the glass fibers in the formingchamber 25, such as by spraying, prior to the application of the binder composition to at least partially cool the glass fibers. Although any conventional binder such as phenol-formaldehyde and urea-formaldehyde may be used, the binder is desirably a low formaldehyde binder composition, such as a polycarboxylic based binder, a polyaciylic acid glycerol (PAG) binder, or a polyaciylic acid triethanolamine (PAT binder). Suitable polycarboxy binder compositions for use in the instant invention include a polycarboxy polymer, a crosslinking agent, and, optionally, a catalyst. Such binders arc known for use in connection with rotary fiberglass insulation. Examples of such binder technology are found in U.S. Pat. Nos. 5,318,990 to Straus; 5,340,868 to Straus et al.; 5,661,213 to Arkens et al.; 6,274,661 to Chen et al.; 6,699,945 to Chen et al; and 6,884,849 to Chen et al., each of which is expressly incorporated entirely by reference. The binder may be present in an amount from about 2% to about 25% by weight of the total product, and preferably from about 5% to about 20% by weight of the total product, and most preferably from about 10% to about 18% by weight of the total product. - The glass fibers having the uncured resinous binder adhered thereto may be gathered and formed into an
uncured pack 40 on thefacer 12 on an endless formingconveyor 45 within the formingchamber 25 with the aid of a vacuum (not shown) drawn through theinsulation pack 40 from below the formingconveyor 45. It is to be noted that throughout this application,facers facer 12 is supplied to theconveyor 45 byroll 90. The residual heat from the glass fibers and the flow of air through theinsulation pack 40 andfacer 12 during the forming operation are generally sufficient to volatilize a majority of the water from the binder before the glass fibers exit the formingchamber 25, thereby leaving the remaining components of the binder on the fibers as a viscous or semi-viscous high-solids liquid. - The coated
uncured pack 40, which is in a compressed state due to the flow of air through thepack 40 in the formingchamber 25, and thefacer 12 are then transferred out of the formingchamber 25 underexit roller 50 to atransfer zone 55 where theinsulation pack 40 vertically expands due to the resiliency of the glass fibers. The expandeduncured pack 40 andfacer 12 are then heated, such as by conveying thepack 40 through a curingoven 60 where heated air is blown through theinsulation pack 40 andfacer 12 to evaporate any remaining water in the binder, cure the binder and the adhesive, rigidly bond the fibers together in theinsulation pack 40, and adhere thefacer 12 to theinsulation pack 40. Thefacer 12 and theinsulation pack 40 are heated to a temperature at or above the temperature of the above the waterless, thin-film adhesive for a time period sufficient to at least partially melt the waterless, thin-film adhesive and bond the adhesive to theinsulation pack 40. Specifically, heated air is forced though afan 75 through thelower oven conveyor 70, theinsulation pack 40 and thefacer 12, theupper oven conveyor 65, and out of the curingoven 60 through anexhaust apparatus 80. The cured binder imparts strength and resiliency to thefaced insulation product 10. It is to be appreciated that the drying and curing of the binder and the waterless, thin-film adhesive may be carried out in either one or two different steps. Also, in the curingoven 60, theuncured pack 40 may be compressed by upper and lowerforaminous oven conveyors fibrous insulation product 10 having a predetermined thickness. - The faced
fibrous insulation 10 then exits the curingoven 60 and may be rolled by roll-updevice 82 for storage and/or shipment. The facedfibrous insulation product 10 may subsequently be unrolled and cut or die pressed to form fibrous insulation parts (e.g., duct boards). Alternatively, as depicted inFIG. 3 , the facedfibrous insulation product 10 may be cut to a predetermined length by a cutting device such as a blade orknife 83 to formpanels 84 of the faced fibrous insulation. Thepanels 84 may be stacked or bagged by apackaging apparatus 86 If desired, channels or grooves, such as v-shaped grooves, may be formed in the inner surface of thefibrous insulation product 10 for folding or bending thefibrous insulation product 10 into a duct liner, as is discussed in more detail below. - In an alternate embodiment depicted in
FIG. 4 , anuncured pack 40 is formed as described in detail above with respect toFIG. 2 . Once theuncured pack 40 is formed and exits the formingchamber 25, afacer 12 is applied to a top surface of theuncured pack 40 fromroll 90. Thefacer 12 and theuncured pack 40 enter the curingoven 60 where heated air is forced though afan 75 through thelower oven conveyor 70, theinsulation pack 40 and thefacer 12, theupper oven conveyor 65, and out of the curingoven 60 through anexhaust apparatus 80. As the facedfibrous insulation product 10 exits theoven 60, it may be cut intopanels 84 by the cuttingdevice 83 and collected by thegathering apparatus 86. Alternatively, the facedfibrous insulation product 10 may be rolled by a roll-up device (not illustrated) for storage and/or shipment. As illustrated inFIG. 5 , thefaced insulation product 10 formed by the processes depicted inFIGS. 2 , 3, and 4 include afibrous insulation layer 14 and a facingmaterial 12 affixed to a major surface of theinsulation layer 14. In a related embodiment, thefacer 12 may be applied to one surface of thefibrous insulation 14 where thefacer 12 is larger than thefibrous insulation 14 and drapes over the edges of theinsulation layer 14 to face one or more of the minor surfaces of thefibrous insulation 14. - In one or more exemplary embodiment, the
faced insulation product 10 may be utilized as a duct liner or duct wrap. For example, a duct liner or duct wrap may be formed from the insulation products described above where theinsulation layer 14 has thereon asingle facer 12 that is wider than theinsulation layer 14 along a transverse edge to form aflange 134. In preferred embodiments, thefacer 12 is a foil/scrim/Kraft layer. As shown inFIGS. 6 a and 6 b, theduct wrap 145 may be formed of afacer 12 including aflange 134 adhered to aninsulation layer 14 by a waterless, thin-film adhesive 125. Theduct wrap 145 may be wrapped around asheet metal duct 137 and the edges of theduct wrap 145 sealed by theseating flange 134. Specifically, the sealingflange 134 may be adhered or bonded to the adjoining surface of the facing layer 12 (e.g., a foil/scrim/Kraft layer) by heat and pressure due to the pre-applied waterless, thin-film adhesive 125. Although theflange 134 is depicted at the middle of a wall of themetal duct 137, one skilled in the art will recognize that the location of the sealingflange 134 on the final assembly, including theduct liner 147 described below, could be at a corner of theduct 137, or at other locations, depending on the location of thegrooves 144 within theinsulation product 10. - Turning to FIGS, 6 c and 6 d, a
duct liner 147 having a facing 12 with aflange 134 adhered to afibrous insulation layer 14 is illustrated. Theduct liner 147 may be folded into a shape substantially similar to the shape of the duct into which it is to be inserted (e.g. a substantially square shape as shown inFIG. 6 d) and inserted into a sheet metal to form a duct assembly (not illustrated). Theduct wrap 145 andduct liner 147 enhance the thermal efficiency of duct work in a building and reduce noise associated with the movement of air through the air duct. - Alternatively, facing materials may be applied to both major surfaces of the
fibrous insulation 14, as shown inFIG. 7 . In one exemplary embodiment, molten glass (not illustrated) is supplied to fiberizingspinners 15 that are rotated at high speeds to force the molten glass through holes in the circumferential sidewalls of the fiberizingspinners 15 and form glass fibers.Blowers 20 direct a gas stream in a substantially downward direction to impinge the attenuated fibers, turning them downward, to form a veil orcurtain 30. The fibers may be sprayed with an aqueous binder bysuitable spray applicators 35. The glass fibers having the uncured resinous binder adhered thereto may then be gathered and formed into anuncured pack 40 on a perforatedendless conveyor 45 within the formingchamber 25. The coateduncured pack 40, which is in a compressed state due to the flow of air through thepack 40 in the formingchamber 25 is then transferred out of the formingchamber 25 underexit roller 50 to atransfer zone 55 where theinsulation pack 40 vertically expands due to the resiliency of the glass fibers. - As the
uncured pack 40 exits the formingchamber 25, facingmaterials materials materials uncured pack 40 fromrolls uncured pack 40 andfacers oven 60 where heated air is blown through theinsulation pack 40 andfacers facer 12 may alternatively be supplied to theconveyor 45 prior to the formation of theuncured pack 40 such that the fibers formed from thespinners 15 are deposited onto thefacer 12. Heated air is forced though afan 75 through thelower oven conveyor 70, theinsulation pack 40 and thefacers upper oven conveyor 65, and out of the curingoven 60 through anexhaust apparatus 80. Also, in the curingoven 60, theuncured pack 40 may be compressed by upper and lowerforaminous oven conveyors fibrous insulation product 10 having a predetermined thickness. The double-facedfibrous insulation product 10 then exits the curingoven 60 and may be rolled by roll-updevice 82 for storage and/or shipment. The facedfibrous insulation product 10 may subsequently be unrolled and cut or die pressed to form fibrous insulation parts. Channels or grooves, such as v-shaped grooves, may optionally be formed in the inner surface of thefibrous insulation product 10 for folding or bending thefibrous insulation product 10 into a duct liner. -
FIG. 8 depicts such a double-facedfibrous insulation product 10 in which afacer 12 is positioned on a first major surface of thefibrous insulation 14 and a second facingmaterial 16 is positioned on a second major surface of thefibrous insulation 14. - The presence of water, dust, and/or other microbial nutrients in the
faced insulation product 10 may support the growth and proliferation of microbial organisms. Bacterial and/or mold growth in the insulation product may cause odor and discoloration of the insulation product and deterioration of the vapor barrier properties of Kraft paper. To inhibit the growth of unwanted microorganisms such as bacteria, fungi, and/or mold in thefaced insulation product 10, the facingmaterials fibrous insulation 14 may be treated with one or more anti-microbial agents and/or biocides. The anti-microbial agents and/or biocides may be added during manufacture or in a post manufacture process of the fibrous insulation product. In addition, flame retardants, pigments, colorants, and/or other conventional additives may be included in thefaced insulation product 10. - Application of the waterless, thin-film adhesive to the first and second facing layers 12, 16 reduces the time associated with drying and bonding (curing) the adhesive, both to the facing layers 12, 16 and to the
fibrous insulation product 10. Conventional adhesives are water-based and require an enormous amount of heat energy to flash off the water during the curing of the adhesive. The waterless, thin-film adhesive requires much less energy to cure, which may result in a reduction in manufacturing costs. Additionally, the lack of water in the waterless, thin-film adhesive helps to reduce or eliminate the detrimental effects to the insulation typically caused by water-based adhesives, such as, but not limited, to surface foil corrosion and the stimulation of trimethylamine (TMA) and its associated odor. In addition, the waterless, thin-film adhesive exhibits a constant or nearly constant weight distribution across the facing, unlike conventional water-based adhesives which commonly have inconsistent weight across the facing material due to equipment malfunction or the inherent uneven application of the water-based adhesive. The reduction of surface foil corrosion permits a better adhesion of tape and duct board foil, if such tape is utilized. - In an alternative embodiment shown in
FIG. 9 , anuncured pack 40 is formed as described in detail above with respect toFIG. 7 . Once theuncured pack 40 is formed and exits the formingchamber 25,facers uncured pack 40 fromrolls facer 12 may instead be supplied to theconveyor 45 prior to the formation of theuncured pack 40 such that the fibers formed from thespinners 15 are deposited onto thefacer 12. Thefacers uncured pack 40 enter the curingoven 60 where heated air is forced though afan 75 through thelower oven conveyor 70, theinsulation pack 40 and thefacers upper oven conveyor 65, and out of the curingoven 60 through anexhaust apparatus 80. As the double-facedfibrous insulation product 10 exits theoven 60, it may be bisected by a bisect saw 94 or other suitable cutting device and rolled into two rolls by an upper roll-updevice 96 and a lower roll-tip device 98. The product thus formed is an insulation product having thereon afacer 12 on one major surface thereof, such as is depicted inFIG. 5 . -
FIGS. 10A and 10B show alternate methods of forming thefaced insulation product 10 in a post-curing or off-line process using a heated platen 100 (FIG. 10A ) and a heated roller 102 (FIG. 10B ). Here, the facingmaterial 12 is unrolled fromroll 90 onto the curedinsulation layer 14. Theheated platen 100 orheated roller 102 at least partially melts the waterless, thin-film adhesive that has been pre-applied to the facing material as described above to adhere thefacer 12 onto theinsulation layer 14. -
FIG. 11 illustrates an alternative post-cure method of forming the double-facedfibrous insulation product 10 utilizing aheated caterpillar 110. Theheated caterpillar 110 has a heatedupper belt 112 that rotates around a firstupper belt roller 114 and a secondupper belt roller 116 to compress thefibrous insulation layer 14 against a heatedlower belt 120 that rotates around a firstlower belt roller 122 and a secondlower belt roller 124. Theupper belt 112 presses facing 12 to an upper surface of the curedfibrous insulation layer 14 and thelower belt 120 presses facing 16 to a lower surface of theinsulation layer 14 for a time sufficient to heat the waterless, thin-film adhesives to adhere facinglayers fibrous layer 14 and form thefibrous insulation product 10. - In one exemplary embodiment, the
fibrous insulation product 10 is a duct board having facing materials on first and second major surfaces of an insulation layer, a sealing flange, and optionally, male and female shiplap edges. The facing materials are formed of an outer surface layer, such as, but not limited to, a vapor barrier, and an inner surface layer formed of a nonwoven fibrous web, veil, or mat. One example of aduct board 128 according to the present invention is depicted inFIGS. 12-14 . In this exemplary embodiment, a first facinglayer 130 is a vapor barrier positioned on a first major surface of thefibrous insulation layer 14 and is affixed to the first major surface by a waterless, thin-film adhesive 125. Asecond facing layer 132 may be a fibrous web, such as the web described in detail above, which is affixed to a second major surface of thefibrous insulation layer 14 by a waterless thin-film adhesive 127. The waterless, thin-film adhesives facer 12 orfacer 16 described in detail above. - Turning to
FIGS. 13 and 14 , theduct board 128 may be formed into anair duct 135 by folding theduct board 128 into a generally rectangular shape such that the second facinglayer 132 faces an interior portion thereof and the first facing layer (e.g., vapor barrier) is positioned on an exterior surface of theair duct 135. It is to be appreciated that although a square air duct is shown, the air duct may be formed into a non-square shape, such as a rectangular, round, or oval air duct, as would be understood by those of skill in the art. Thesecond facing layer 132 facilitates air flow through the duct and reduces or eliminates the occurrence of flyaway glass fibers from theinsulation layer 14. To facilitate bending of theduct board 128,grooves 144 may be cut or otherwise formed into theduct board 128 at even intervals where theduct board 128 is to be folded to permit theduct board 128 to be folded along thegrooves 144 and formed into theair duct 135. The sealingflange 134 may be adhered or bonded to the adjoining surface of the first facing layer 132 (e.g., a foil/scrim/Kraft layer) by heat and pressure due to the pre-applied waterless, thin-film adhesive 125. - In an alternate embodiment, shown in
FIGS. 15-17 , the first facinglayer 130 is wider than theinsulation layer 14 and projects beyond theinsulation layer 14 along a transverse edge to form a sealingflange 134 extending from amale shiplap edge 140. Thefirst facing layer 130 may be applied to thefibrous layer 14 in an offset manner such that a transverse edge of the first facinglayer 130 extends beyond a corresponding transverse edge of thefibrous insulation layer 14 to form themale shiplap edge 140. An opposing transverse edge of theinsulation layer 14 is thus formed into afemale shiplap edge 142. Theduct board 128 may also be formed such that one or both of the longitudinal edges also form a shiplap edge (not depicted). As illustrated inFIG. 16 ,grooves 144 may be cut into the duct board to facilitate bending of the duct board into anair duct 135. - Once the
duct board 128 is folded, as shown inFIG. 17 , the male and female shiplap edges 140, 142 are mated and sealingflange 134 covers the interface of the male and female shiplap edges 140, 142. As with the embodiment set forth above, the sealingflange 134 may be adhered or bonded to the adjoining surface of the first facing layer 132 (e.g., a foil/scrim/Kraft layer) by heat and pressure due to the pre-applied waterless, thin-film adhesive 125. - The waterless, thin-film adhesive seals the sealing
flange 134 without tape or staples and thus reduces, or even eliminates, the need for foil tape or staples, which are conventionally used in the industry. Because foil tape is expensive and time consuming to apply, the use of the waterless, thin-film adhesive saves both time and money. Additionally, the sealingflange 134 may be securely and easily bonded in the field, such as with a hot iron, and may be repositioned due to the thermoplastic nature of the waterless, thin-film adhesive. - The invention of this application has been described above both generically and with regard to specific embodiments. Although the invention has been set forth in what is believed to be the preferred embodiments, a wide variety of alternatives known to those of skill in the art can be selected within the generic disclosure. The invention is not otherwise limited, except for the recitation of the claims set forth below.
Claims (20)
1. A faced fibrous insulation product comprising:
a fibrous insulation layer having first and second opposed major surfaces; and
a first facing layer adhered to said first major surface, said first facing layer having thereon a first pre-applied waterless, thin-film adhesive, wherein said first facing layer is adhered to said first major surface of said fibrous insulation layer by heating said fibrous insulation layer and said first facing layer to a temperature at or above the melting point of said first pre-applied waterless, thin-film adhesive.
2. The faced insulation product of claim 1 , wherein said first pre-applied waterless, thin-film adhesive is selected from the group consisting of a polyethylene copolymer, polyurethane, ethylene vinyl acetate, amorphous polyolefin, polyethylene, low density polyethylene, cellophane, polyethylene terephthalate, polyvinyl chloride, nylons, polypropylene, polystyrene, polyamides and cellulose acetate.
3. The faced insulation product of claim 1 , wherein said first facing layer is a vapor barrier and said first facing layer extends beyond said fibrous insulation layer to form a sealing flange.
4. The faced insulation product of claim 3 , wherein said insulation product contains a plurality of grooves to permit folding of said insulation product into one of a duct liner or a duct wrap.
5. The faced insulation product of claim 3 , wherein said first pre-applied thin-film adhesive is thermoplastic and said first facing layer and said sealing flange may be repaired or repositioned with the application of heat.
6. The faced insulation product of claim 3 , wherein said first pre-applied waterless, thin-film adhesive is substantially evenly applied to said fibrous insulation layer.
7. The faced insulation product of claim 1 , further comprising a second facing layer adhered to said second major surface of said fibrous insulation layer, said second facing layer having thereon a second pre-applied waterless, thin-film adhesive.
8. The faced insulation product of claim 7 , wherein said first and second facing layers are selected from the group consisting of a vapor barrier, a nonwoven mat, web and veil.
9. A fibrous duct board comprising:
a fibrous insulation layer having a first and second opposing major surfaces;
a first facing layer adhered to said first major surface, said first facing layer having thereon a first pre-applied waterless, thin-film adhesive, wherein said first facing layer is wider than said insulation layer such that said first facing layer extends beyond an edge of said fibrous insulation layer to form a sealing flange; and
a second facing layer adhered to said second major surface, said second facing layer having thereon a second pre-applied waterless, thin-film adhesive,
wherein said first and second facing layers are adhered to said fibrous insulation layer by heating said fibrous insulation layer, said first facing layer, and said second facing layer a temperature at or above the melting points of said first and second waterless, thin-film adhesive.
10. The fibrous duct board of claim 9 , further comprising male and female shiplap edges, said sealing flange extending from said male shiplap edge.
11. The fibrous duct board of claim 9 , wherein said first and second pre-applied waterless, thin-film adhesive are substantially evenly applied to said fibrous insulation layer
12. The fibrous duct board of claim 9 , wherein said first and second pre-applied waterless, thin-film adhesive is selected from the group consisting of a polyethylene copolymer, polyurethane, ethylene vinyl acetate, amorphous polyolefin, polyethylene, low density polyethylene, cellophane, polyethylene terephthalate, polyvinyl chloride, nylons, polypropylene, polystyrene, polyamides and cellulose acetate.
13. The fibrous duct board of claim 9 , wherein said first and second pre-applied thin-film adhesives are thermoplastic and said first and second facing layers may be repaired or repositioned with the application of heat.
14. The fibrous duct board of claim 9 , wherein said first facing layer is a vapor barrier and said second facing layer is selected from the group consisting of a nonwoven fibrous web, veil and mat.
15. A method of forming a faced fibrous insulation product comprising:
pre-applying a first waterless, thin-film adhesive to a first facing material to form a first facing layer;
forming a pack of fibers having an uncured binder thereon;
applying said first facing layer to a first major surface of said pack of fibers;
heating said first facing material and said pack of fibers to cure said binder and at least partially melt said first waterless, thin-film adhesive to form a faced insulation product.
16. The method of claim 15 , further comprising:
pre-applying a second waterless, thin-film adhesive to a second facing material to form a second facing layer;
applying said second facing layer to a second major surface of said pack of fibers;
at least partially melting said second waterless, thin-film adhesive to adhere said second facing layer to said pack of fibers,
wherein said first and second waterless, thin-film adhesives may be the same or different.
17. The method of claim 16 , wherein said step of applying said first facing layer positions said first facing layer to extend beyond said pack of fibers to form a sealing flange.
18. The method of claim 17 , further comprising:
forming grooves in said faced insulation product;
folding said insulation product along said grooves into a duct liner; and
heating said sealing flange to seal said sealing flange against a first portion of said insulation product to secure the formation of said duct liner.
19. The method of claim 16 , wherein said first and second waterless, thin-film adhesives are selected from the group consisting of a polyethylene copolymer, polyurethane, ethylene vinyl acetate, amorphous polyolefin, polyethylene, low density polyethylene, cellophane, polyethylene terephthalate, polyvinyl chloride, nylons, polypropylene, polystyrene, polyamides and cellulose acetate.
20. The method of claim 16 , wherein said first and second thin-film adhesives are thermoplastic and said first and second facing layers may be repaired or repositioned with the application of heat.
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/167,285 US20100000170A1 (en) | 2008-07-03 | 2008-07-03 | Pre-Applied Waterless Adhesive On HVAC Facings With Sealable Flange |
EP09774408A EP2297506A1 (en) | 2008-07-03 | 2009-07-01 | Pre-applied waterless adhesive on hvac facings with sealable flange |
PCT/US2009/049348 WO2010002958A1 (en) | 2008-07-03 | 2009-07-01 | Pre-applied waterless adhesive on hvac facings with sealable flange |
CN2009801320593A CN102124262A (en) | 2008-07-03 | 2009-07-01 | Pre-applied waterless adhesive on HVAC facings with sealable flange |
CA2729768A CA2729768A1 (en) | 2008-07-03 | 2009-07-01 | Pre-applied waterless adhesive on hvac facings with sealable flange |
MX2010014449A MX2010014449A (en) | 2008-07-03 | 2009-07-01 | Pre-applied waterless adhesive on hvac facings with sealable flange. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US12/167,285 US20100000170A1 (en) | 2008-07-03 | 2008-07-03 | Pre-Applied Waterless Adhesive On HVAC Facings With Sealable Flange |
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US20100000170A1 true US20100000170A1 (en) | 2010-01-07 |
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US12/167,285 Abandoned US20100000170A1 (en) | 2008-07-03 | 2008-07-03 | Pre-Applied Waterless Adhesive On HVAC Facings With Sealable Flange |
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EP (1) | EP2297506A1 (en) |
CN (1) | CN102124262A (en) |
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MX (1) | MX2010014449A (en) |
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CN102124262A (en) | 2011-07-13 |
EP2297506A1 (en) | 2011-03-23 |
CA2729768A1 (en) | 2010-01-07 |
WO2010002958A1 (en) | 2010-01-07 |
MX2010014449A (en) | 2011-03-29 |
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