USRE34929E - Plastic bag for vacuum sealing - Google Patents
Plastic bag for vacuum sealing Download PDFInfo
- Publication number
- USRE34929E USRE34929E US08/007,850 US785093A USRE34929E US RE34929 E USRE34929 E US RE34929E US 785093 A US785093 A US 785093A US RE34929 E USRE34929 E US RE34929E
- Authority
- US
- United States
- Prior art keywords
- receptacle
- protuberances
- panel
- layer
- define
- 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.)
- Expired - Lifetime
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
- B65D31/02—Bags or like containers made of paper and having structural provision for thickness of contents with laminated walls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
- B65D81/18—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient
- B65D81/20—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient under vacuum or superatmospheric pressure, or in a special atmosphere, e.g. of inert gas
- B65D81/2007—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient under vacuum or superatmospheric pressure, or in a special atmosphere, e.g. of inert gas under vacuum
- B65D81/2023—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient under vacuum or superatmospheric pressure, or in a special atmosphere, e.g. of inert gas under vacuum in a flexible container
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
- B65D81/18—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient
- B65D81/20—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient under vacuum or superatmospheric pressure, or in a special atmosphere, e.g. of inert gas
- B65D81/2007—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient under vacuum or superatmospheric pressure, or in a special atmosphere, e.g. of inert gas under vacuum
- B65D81/2038—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient under vacuum or superatmospheric pressure, or in a special atmosphere, e.g. of inert gas under vacuum with means for establishing or improving vacuum
Definitions
- a tubular receptacle adapted to be formed into an evacuated and sealed bag comprising first and second superimposed plastic panels, each having a uniform thickness and defining inner and outer surfaces thereon, joined together at opposite lateral sides thereof to define a chamber adapted to have a product disposed therein.
- Each of the first and second panels comprises a uniform inner layer, defining one of said inner surfaces thereon, composed of a heat sealable material, and a uniform outer layer composed of a gas impermeable material.
- a plurality of raised protuberances having said uniform thickness and formed in a generally regular and waffle-like pattern on the inner surface of at least one of the first and second panels, project outwardly therefrom towards the inner surface of the other panel to define a plurality of intercommunicating channels entirely around and between the protuberances.
- an intermediate layer is bonded between the inner and outer layers of at least one of the first and second panels and is composed of a material exhibiting a stiffness greater than each of the inner and outer layers.
- the protuberances have a width and length substantially greater than the width of each channel portion disposed between each adjacent pair of protuberances and each protuberance has an exposed surface area on a distal end thereof, directly facing the inner surface of the other panel, that is substantially larger than the channel portion when the protuberances and channels are viewed in plan view. .Iaddend.
- the present invention relates to packaging materials and, in particular, to a plastic bag for vacuum packaging of perishable items.
- the bag is both heat sealable as well as capable of preventing the later reentry of gases, particularly oxygen, into the interior of the bag.
- the entire process of creating the vacuum and sealing the bag is simple enough to be applicable to both a home or a commercial appliance.
- the present invention meets the above-mentioned objects by providing a plastic bag which comprises an inner layer of heat sealable thermoplastic material and an outer layer of gas-impermeable material.
- the thermoplastic material incorporates interconnected air channels on its inner surface to permit air to flow from all areas of the bag when suction is applied.
- the inner layer and the outer layer are joined together over their entire adjacent surfaces such that no air pockets exist between the layers.
- one or more intermediate layers may be "sandwiched" between the inner heat sealable layer and the outer gas-impermeable layer to provide additional characteristics to the bag as desired, a criteria being that each of the layers comprising the bag be joined such that no air pockets exist between the inner layer and the outer layer.
- FIG. 1 is a perspective view illustrating a plastic bag in accordance with the present invention
- FIG. 2 is an enlarged perspective view illustrating the inner structure of a bag in accordance with the present invention
- FIG. 3 is a cross-sectional view illustrating the structure of a plastic bag in accordance with the present invention.
- FIG. 4 is a top view illustrating the inside layer of a plastic bag in accordance with the present invention.
- FIG. 5 is a cross-sectional view illustrating the structure of a plastic bag in accordance with the present invention.
- FIG. 6 is an enlarged perspective view illustrating the inner structure of a bag panel that has an intermediate layer in accordance with the present invention.
- FIG. 7 is a cross-sectional view illustrating the structure of a plastic bag with an intermediate layer in accordance with the present invention. .Iaddend.
- FIG. 1 shows a plastic bag 10 with a nozzle 12 from a vacuum pump inserted into its open end.
- the nozzle 12 is of a flat, tapered design so that the bag 10 can be held air-tight around the nozzle by means of hard foam rubber clamps 14 which are held tightly together for this purpose.
- the .[.sides.]. .Iadd.two panels .Iaddend.of the bag 10 are .Iadd.each .Iaddend.made of at least two layers.
- An inner layer 16 is formed from a heat sealable thermoplastic material.
- An outer layer 18 is formed from a gas-impermeable material to provide a barrier against the influx of air to the interior of the bag 10 after it has been sealed.
- the inner layer 16 includes a pattern of intersecting channels 20 formed on at least one of its facing inner surfaces.
- one or more intermediate layers may be "sandwiched" between the inner layer 16 and the outer layer 18 to provide additional characteristics to the bag 10 as desired.
- an intermediate stiffener layer may be added.
- the layers of the bag must be joined together such that no air pockets exist between the heat sealable inner layer and the gas-impermeable outer layer.
- the bags 10 can be made as individual bags or as continuous bag rolls.
- FIG. 2 illustrates an example of a crisscrossing channel design of the inner layer 16.
- the inner layer 16 is embossed with a rectangular pattern 24 in such a way that the grooves between the "islands" form a distinctive inner channel pattern.
- FIG. 3 shows a pattern embossed on one surface of both layer 16 and layer 18 of the formerly flat compound film.
- FIG. 3 shows that only one side of the bag 10 may feature the channels 20, while the opposite flat side is composed of two flat layers 16' and 18' which can be made of the same materials as the layers 16 and 18. Even after the two interior surfaces of the bag 10 touch, the channels 20 remain intact for the complete evacuation of air from the bag 10.
- the receptacle preferably comprises superimposed plastic panels of uniform thickness joined together at opposite lateral sides thereof to define a chamber adapted to have a product disposed therein.
- Each of the panels comprises a uniform inner layer 16, 16' composed of a heat sealable material, and a uniform outer layer 18, 18' composed of a gas impermeable material.
- the plurality of raised protuberances comprising pattern 24 are formed in a generally regular and waffle-like pattern on the inner surface of at least one of the panels to project outwardly therefrom towards the inner surface of the other panel. As described above, this pattern thus defines the plurality of intercommunicating channels 20 entirely around and between the protuberances. As shown in FIG. 3, the protuberances may be solely formed on the inner surface of one panel with the inner surface of the other panel being flat and uninterrupted.
- the distal ends of the protuberances and the bottom surfaces defining channels 20, facing the inner surface of the other panel each define at least generally flat and exposed surface areas thereon that are co-planar relative to each other.
- Each exposed surface area is shown as being rectangular (square) and each protuberance and each channel as being trapezoidal, when viewed in cross-section.
- the protuberances are further formed in the panel to form a plurality of interconnected and raised ridges on the outer surface thereof that project outwardly therefrom to define channels 20 therein.
- the outer surface areas of the ridges are at least generally flat and co-planar relative to each other.
- FIG. 4 illustrates an alternative embossing pattern 26 in channels 20.
- the pattern is triangular, rendering a channeled pattern of three sets of parallel lines 26a, 26b and 26c which intersect at 60° angles.
- FIG. 5 shows an embodiment of the bag 10 in which the inner layer 16 .[.as.]. .Iadd.has .Iaddend.been made to carry a design created by thickness variations in such a way that channels 20 are formed in the areas of reduced thickness .[.28.]. .Iadd.17 .Iaddend.while the islands 30 form the contact area with the opposite bag side.
- the outer layer 18 is flat and joined over its entire surface with the outer flat surface of inner layer 16.
- the opposite side of the bag 10 is, in this case, a flat compound film made of corresponding layers 16' and 18'.
- the inner layer 16 is, preferably, polyethylene, which is food safe but does not constitute an oxygen barrier. It also is not by itself boilable nor has it sufficient mechanical strength.
- the plasticity temperature of the outer layer 18 typically is above 200° C., while that of the inner layer 16 is below 130°. When heat sealing clamps 22 heat the outer layer 18, heat is also transported to the inner layer 16 which is then heat sealed. Because of the substantially higher plasticity and melting temperatures of the outer layer 18, there is no danger of melting or puncturing the outer layer 18 during the heat sealing cycle which is designed for the inner layer 16.
- the wall thickness of the compound film is between 2.5 and 4.5 mils.
- the thickness of the gas impermeable outer layer 18 is approximately 0.5-1.0 mils (50-100 gauge), with the heat sealable inner layer 16 comprising the remainder of the thickness.
- the outer layer 18' of the flat side of the bag 10 comprises polyester or nylon of a thickness of 0.5-1.0 mils.
- the inner layer 16' comprises polyethylene or polypropylene at a thickness of 1.5-3.0 mils. These films are laminated, coextruded or extrusion-coated to form a single transparent film such that the outer layer 18' and the inner layer 16' are joined together over their entire adjacent surfaces.
- the materials and the joining of the outer layer 18 and the inner layer 16 are as described with respect to the flat side; however, the thickness of the channel side layers may be different and one or both layers may be opaque white.
- the regular or irregular pattern of interconnecting air channels can be created during the co-extrusion or extrusion-coating processing of the multi-layer film, or it may be post-embossed, forming a corresponding pattern of ridges on the nylon/polyester side.
- the depth of these channels is typically not less than three times the film thickness.
- the embossing may be done on steel to steel or rubber to steel roller machines, the first being faster, but requiring very tight adjustment tolerances in order not to damage the .[.firm.]. .Iadd.film.Iaddend.. The latter is slower, but more forgiving.
- the different plasticity and melting temperatures of the two adjacent layers 16 and 18 must be taken into consideration. Temperatures have to be high enough to allow the outer layer 18 of nylon or polyester to accept the pattern without tearing or damage, but not high enough to melt the inner layer 16. The available temperature range is extremely small and must be accurately monitored. Heat may be introduced through the rollers by hot air or infrared radiation. The later is quicker to react to adjustments and, thus, particularly suited for steel to steel roller machines.
- the embossing process can be done with state of the art equipment provided special care is taken and the requirements of the multi-layer film are met.
- the two films i.e. the flat side consisting of outer layer 18' and inner layer 16' and the embossed side consisting of outer layer 18 and inner layer 16, are joined by means of heat seals along the edges of 8" or 11" wide strips with the heat sealable polyethylene layers facing each other, thus forming an open tube or an endless open bag.
- These endless bags are then cut and sealed across to any desired bag length or cut and rolled into 20" continuous bag rolls.
- the bag 10 may be constructed to include layers intermediate the heat sealable inner layer and the gas-impermeable outer layer so long as the layers are joined together over their entire adjacent surfaces such that no air pockets exist between the inner layer and the outer layer.
- the inner layer is low density, heat sealable polyethylene about 0.5-1.0 mils thick.
- An intermediate layer comprises high density polyethylene about 1.5 mils thick to impart stiffness to the bag structure.
- the outer, gas-impermeable layer is nylon about 0.5 mils thick.
- the multi-layer film which forms the bag, and which may be formed by co-extrusion of the three above-mentioned materials is about 3.0-3.5 mils total thickness.
- FIGS. 6 and 7 illustrate a bag with an intermediate layer 32 sandwiched between the inner layer 16 and the outer layer 18.
- FIG. 6 is a perspective view showing one panel formed from a three-layer film, with air channels 20 between and among the protuberances.
- FIG. 7 is a cross-sectional view of an assembled bag, where one panel is formed from a three-layer film. .Iaddend.
Abstract
Description
Claims (16)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/007,850 USRE34929E (en) | 1985-09-23 | 1993-01-22 | Plastic bag for vacuum sealing |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US77887585A | 1985-09-23 | 1985-09-23 | |
US911087A | 1987-01-28 | 1987-01-28 | |
US07/036,323 US4756422A (en) | 1985-09-23 | 1987-04-09 | Plastic bag for vacuum sealing |
US08/007,850 USRE34929E (en) | 1985-09-23 | 1993-01-22 | Plastic bag for vacuum sealing |
Related Parent Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US911087A Continuation-In-Part | 1985-09-23 | 1987-01-28 | |
US07/036,323 Reissue US4756422A (en) | 1985-09-23 | 1987-04-09 | Plastic bag for vacuum sealing |
Publications (1)
Publication Number | Publication Date |
---|---|
USRE34929E true USRE34929E (en) | 1995-05-09 |
Family
ID=27358783
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US08/007,850 Expired - Lifetime USRE34929E (en) | 1985-09-23 | 1993-01-22 | Plastic bag for vacuum sealing |
Country Status (1)
Country | Link |
---|---|
US (1) | USRE34929E (en) |
Cited By (94)
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US5592697A (en) * | 1995-04-18 | 1997-01-14 | Young; Russell | Waterproof pocket |
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US5879015A (en) * | 1992-02-10 | 1999-03-09 | Ramsey; Michael P. | Method and apparatus for receiving material |
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