|Publication number||US3825379 A|
|Publication date||23 Jul 1974|
|Filing date||10 Apr 1972|
|Priority date||10 Apr 1972|
|Publication number||US 3825379 A, US 3825379A, US-A-3825379, US3825379 A, US3825379A|
|Inventors||D Lohkamp, J Keller|
|Original Assignee||Exxon Research Engineering Co|
|Export Citation||BiBTeX, EndNote, RefMan|
|Referenced by (200), Classifications (21)|
|External Links: USPTO, USPTO Assignment, Espacenet|
United States Patent Lohkamp et al.
[ MELT-BLOWING DIE USING CAPILLARY TUBES  Inventors: Dwight T. Lohkamp; James P. Keller, both of Baytown, Tex.
 Assignee: Exxon Research and Engineering Company, Linden, NJ.
 Filed: Apr. 10, 1972 21 Appl. No.: 242,504
 US. Cl. 425/72, 425/464  Int. Cl. D0ld 3/00, D01d 7/00  Field of Search 425/464, 72; 264/176 F,
 References Cited UNITED STATES PATENTS 1,310,509 7/1919 Specht ..425/464 [111- 3,825,379 [451 July 23,1974
Ladisch 264/176 F Hartmann et al 425/464 X Primary Examiner-Robert D. Baldwin Attorney, Agent, or Firm-David A. Roth [5 7] ABSTRACT A melt-blowing die which has capillary tubes rather than drilled orifices is more easily fabricated and operates more effectually. Preferably, one end of each capillary tube is machined so as to terminate in an apex having an included angle within the range of 30 to- 90. Or the tubes can have conical ends with the same angle. The inside diameter of these tubes range from 0.010 to 0.025 inch and they connect with a chamber in the die. Preferably the die is a two-piece assembly and is fabricated by bolting the two pieces and including the capillary tubes in a solder layer.
16 Claims, 11 Drawing Figures SHEET 2 BF 2 gain FIG. 4.
1 MELT-BLOWING DIE USING CAPILLARY TUBES BACKGROUND OF THE INVENTION DESCRIPTION OF THE PREFERRED EMBODIMENTS During the course of the research project leading to this invention, it was found that dies for use in a meltblowing process require very close tolerances. This has ent invention relates to a die having a plurality of capill lary tubes to produce a line of die openings having internal diameters which are uniform and are precisely aligned as required for the melt-blowing process. 2. Prior Art Melt-blowing and suitable dies therefor are disclosed in the following publications and patents:
l. Naval Research Laboratory Report 4364, Manufacture of Superfine Organic Fibers, Apr. '15, 1954.
2. Wente, Van A., Industrial and Engineering Chemistry, 48, No. 8 (1956, PP. 1342-1346).
3. Naval Research Laboratory Report 5265, An Im- I proved Device for the Formation of Superfine, Thermoplastic Fibers, Feb. 11, 1959.
4. British Pat. No. 1,055,187.
5. US. Pat. No. 3,379,811.
6. Japanese Pat. 25871/69, published Oct. 30, 1969.
SUMMARY OF THE INVENTION A die apparatus for melt-blowing thermoplastic materials having a plurality of capillary tubes as the die openings. The die is a two piece assembly and the capillary tubes are included in the solder layer between the two pieces to form the die apparatus.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 5 is a sectional view taken across 5-5 of FIG. 4 showing a top view of one portion of the die with the capillary tubes in position before soldering;
FIG. 6 is a cross sectional view taken across 66 of FIG. 4 showing one capillary tube in position before soldering on one piece of the die;
FIG. 7 is a view in cross section similar to FIG. 6 wherein the two pieces making up the die are bolted together and packed in preparation for heating the solder;
FIG. 8 is a view in cross section of the die as the die would be positioned in the oven or being heated, with a reservoir for the solder attached;
FIG. 9 is a top view of the die with the reservoir for the solder attached before machining;
FIG. 10 is a cross sectional view of thedie after machining whereby a preferred embodiment of the present invention is produced; and
FIG. 11 is a cross sectional view of another embodiment of a die of the present invention.
made their fabrication very difficult and costly. One requirement which is responsible for the high cost is the large number of very small holes which must be drilled. A second requirement which was'found, that fabricators have difficulty adhering to, is that all holes must emerge on a sharp (chisel) edge and that this line of holes must be accurately in line over long distances. The center of each tube must not be offset from a straight line by more than 3 mils.
A method has been found of fabricating this type of die which overcomes some of the above difficulties and reduces the cost of the die. This method uses capillary tubes to replace drilled holes in the die. By using capillary tubes, the problems associated with precise drilling or electrical discharge machining of very small holes are avoided. Of greater importance, it is possible to align the row of capillary tubes very precisely so that the holes follow a straight line accurately.
In general the method used to demonstrate the principles of using capillary tubes follows. Two metal blocks which will each form one-half of the die are machined with the desired melt cavity. The melt cavity distributes the flow of thermoplastic fluid to. the inlets of the orifices. Slots are then milled accurately in the areas where the capillaries are to be packaged. Each block has an identical slot with a depth equal to or slightly less than the radius of a capillary tube. Channels are then milled in the end blocks (outside of the area which will contain holes) and along the slots at the mid-point of the tube location. These channels are filled with solder and then the solder is machined smooth. The capillary tubes are then packed into one slot and the two halves are matched and carefully aligned. The clamped halves are placed in a nitrogen oven where the soldering is completed. The soldered die is then finally machined.
Other methods of soldering can also be used. The advantages of using a capillary die include the following:
1. Holes can be longer since they do not have to be drilled.
2. Hole diameters are very uniform.
3. Holes do not have burrs or jagged interiors.
4. It is easier to achieve the precise alignment required to make superior webs by the melt-blowing process.
5. Machining of a melt channel is easier since this can be done on split halves, as compared to a single piece assembly.
6. Fabrication costs are greatly reduced.
A 2-inch die has been made using the capillary tube method. This die has performed satisfactorily on the melt-blowing process.
Since melt-blowing in general and dies therefore have been described as indicated above this specification will be devoted to the details of the novel die apparatus of the invention. 9
This can be best accomplished with the aid of the drawings.
Referring to FIG. 1 of the drawings, a melt-blowing process is carried out by introducing into hopper l pellets of one or more thermoplastic materials, i.e. resins, and which may include dyes, additives or other modifiers with the thennoplastic resins. These are conveyed into extruder 2.
With some thermoplastic resins it is necessary to degrade them to a considerably lower viscosity by either thermally treating the resin before introducing the resin into the extruder 2, or thermally treating the resin in the extruder 2 and/or die assembly 3.
For example, if polypropylene is to be melt-blown, the polypropylene is added into hopper 1 and heated in extruder 2 at temperatures in excess of 550 F., and preferably within the range of 620 to 800 F. The degree of thermal treatment necessary varies with the molecular weight of the polypropylene.
Resin is forced through extruder 2 into die head 3 by drive 4 which turns the extruder screw (not shown). Die head 3 usually contains heating plate 5 which may also be used in the thermal treatment of the thermoplastic resin before it is melt-blown.
The fluid resin is then forced out of a row of capillary tubes 6 rigidly mounted within die assembly 3, where it is impinged by a gas stream which attenuates the resin into continuous fibers 7 which are collected ona moving collecting device 8 such as drum 9 to form a continuous mat 10.
The hot gas stream, preferably air, which attenuates block 16. The dimensions of troughs l9 and 20 are selected so that when in operating position they just hold the desired number of capillary tubes 6 as determined by the outer diameter (O.D.) of capillary tubes 6.
Troughs 19 and 20 extend into the upper and lower die blocks and 16 ending near shoulder 29 in upper die block 15 and near shoulder 30 in lower die block 16. The height of shoulders 29 and 30 should preferably not exceed the outer diameter tubes 6.
FIG. 4 illustrates the relationship of the various parts prior to final assembly and prior to the actual soldering operation. Solder reservoirs 31 and 32 are seen in cross sectional view. A solder reservoir 31 is in the upper block plate 15 and a solder reservoir 32 is in the lower block 15 where die reservoir 31 and slot 31a are milled.
- For assembly, solder reservoirs 31 and 32 are filled with solder 21. After it has hardened the solder is machined flat so that it does not extend out of the reservolts. The desired number of capillary tubes are then the thermoplastic resin-is supplied through gas jets or The resin is forced into chamber 18 between the upper and lower die blocks 15 and 16, respectively.
According to the present invention, upper and lower die blocks 15 and 16 have been milled beyond chamber 18 to form troughs 19 and 20 to provide a seating cavity for capillary tubes 6. Capillary tubes are rigidly positioned in troughs 19 and 20between die blocks 15 and 16 by solder 21.
In this embodiment, the tubes 6 terminate exterior to chamber 18 in a sharp-angled point indicated as A. Die nose 22 is of generally triangular cross section and can be formed by machining the exterior surfaces of die blocks 15 and 16 as will be described in more detail hereinafter. The point A of the tubes 6 are formed in the machining operation. The angle of the point is within the range of 30 to 90, preferably 55 to 65, most preferably 60.
An upper gas cover plate 23 and a lower gas cover plate 24 are connected to upper and lower die blocks 15 and 16. Hot gas is supplied by inlet 25 in gas plate 23 and inlet 26 in gas plate 24. Suitable baffling means (not shown) can be provided in both upper gas chamber 27 and lower gas chamber 28 to provide a uniform flow of gas through the gas slot 11 and 12.
FIG. 3 shows the relationship of the tubes 6 to each other after having been aligned and soldered into a preferred configuration.
Referring to FIGS. 4-10, inclusive, there isillustrated a technique for making the inventive die. An identical groove or trough 19 is machined in die blocks 15 and 16 and a groove or trough 20 is machined in lower die 'placed in trough 20 of lower die block 16. Upper die block 15 and lower die block 16 are then bolted together. I
As shown in FIG. 7, the two are bolted together by bolts 33 so as to hold capillary tubes 6 firmly within troughs 19 and 20 with the inner ends of capillarytubes 6 abutting shoulders 29 and 30 of the upper die block 15 and lower die block 16. Die blocks 15 and 16 are usually machined to provide the chamber 18 necessary for the introduction of thermoplastic resin to the capillary tubes 6.-
Prior to the heating operation for heating the-solder 21 and introducing more solder 21 to securely hold the capillary tube 6, insulating packing 34 (shown in FIG. 7) is packed in the chamber 18 so that solder 21 will not flow into chamber 18 while the die is heated for soldering. I
In FIGS. 8 and 9, external solder reservoir 35 is shown attached to die blocks 15 and 16 which is bolted to said blocks with screws 36 and 37. The solder reservoir 35 serves to provide a pressure head of solder to replenish solder.
After die blocks 15 and 16 are securely clamped with bolts 33 and tubes 6 are firmly in troughs 19 and 20 and one end of each tube abuts shoulders 29 and 30, die assembly 3 is placed in an oven to heat the solder 21.
When die assembly 3 is placed in the oven, solder 21 melts and flows through solder reservoirs 31 and 32 completely contacting the capillary tubes 6 and filling the space between the capillary tubes 6 in the trough 19 and 20, as shown in FIG. 3. Upon cooling, tubes 6 are rigidly placed between die blocks 15 and 16. It is preferred that the position of the die blocks 15 and 16 be that as shown in FIG. 8 while in the oven or while being heated. Insulating packing 34 prevents flow of solder 21 into the capillary tubes 6 or chamber 18.
It is apparent that the heating must allow solder 21 to completely fill the space around the capillary tubes 6 and provide a complete barricade in troughs 19 and 20 to any possible flow of thermoplastic resin.
Preferably tubes 6 have a length that permits one end of each tube to extend exteriorly past the ends of the die blocks 15 and 16 and lower die block 16 before they are machined.
In the final machining operation, die blocks 15 and 16 are machined to provide a die nose 22 of a triangular cross section which terminates in an angular cross sectional tip A. The angle or as shown in FIG. 10 is between 30 and 90, preferably between 55 and 65, and
most preferably about 60.
In one embodiment, die blocks and 16, and tubes 6 are machined so that tubes 6 have surfaces which are integral with surface 38 of upper die block 15 and 39 of lower die block 16, to form the included angle a. See FIG. 10.
Some even more specific details of preferred embodiments follow. In FIG. 6, trough extends into the lower die block 16 for about A inch to about 1 inch, preferably about 7% inch (as indicated by the dimension x).
The capillary tubes 6 have internal diameters of between about 0.010 to about 0.025 inch, and may have outside diameters of between 0.025 and 0.050 inch, preferably 0.03 to 0.04 inch.
Capillary tubes 6 actually used to construct an embodiment of the invention were 316 stainless steel seamless tubes. This type of steel has the ability to resist the temperatures used in the soldering operation. The tubes were 0.015 t 0.0005 inside diameter x .031 inch outside diameter by 1.0 inch long.
Although capillary tubes having circular cross sections are illustrated, the cross section may be square or rectangular, or any other shape.
It is to be understood that the outside diameter (O.D.) of the capillary tubes controls the spacing of the die openings. This distance is preferably within the range of to 40 mil from center to center.
. The dimensions of the shoulder 30 and depth of the trough 20 in the lower die block 16 will vary depending on the size and shape of the capillary tubes 6 used.
Usually, the dimensions are such that die block 15 and die block 16 when in operating position will snugly hold the capillary tubes in the troughs 19 and 20. Hence, if the dimensions of troughs 19 and 20 are identical, depth Z will be one-half the CD. of the capillary tube used, and-the height Y of the shoulder will be equal to or less than the wall thickness of the capillary tube used.
A suitable solder when capillary tubes of 316 stainless steel are used is Eutectic 1801 silver solder having a composition of 51 percent silver, 22 percent copper, 19 percent zinc, 7 percent cadmium, and 1 percent tin. The flux used with such a solder is Eutectic 1801-8 flux. This particular solder melts at l,l00 F. and bonds at l,l F., according to the manufacturer. While other solder and fluxes may be utilized, if such a solder is used, the clamped upper die block 15 and lower die block 16 would be placed in an oven or otherwise suitably heated to temperatures in excess of the bonding temperature of the solder used. Accordingly, a temperature of at least l,l35 F. is used when Eutectic 1801 solder is employed.
FIG. 11 illustrated a die head embodiment which does not require machining of the die block or capillaries to obtain the desired angular cross sectional tip of each of the capillaries. In contrast it utilizes capillary tubes with conical shaped tips.
Thus, die head 40 is made up of an upper die block 42 and a lower die block 43. Upper die block 42has'a groove or trough 44 and die block 43 also has a groove or trough machined therein for receiving capillary tubes 41. Troughs 44 and 45 end in shoulders 46 and 47. Capillary tubes 41 abut these shoulders.
In operation thermoplastic resin is introduced into the back of the die head 40 through an inlet 48 which enters into a chamber 49 which supplies the resin to the capillaries of the capillary tubes 41.
In this embodiment, capillary tubes 41 project outwardly from the die blocks 42 and 43 at a distance up to about half the length of the tube without requiring any external support other than said die blocks. Upper gas cover plate 50 and a lower gas cover plate 51 forms an upper air or gas chamber 52 and a lower gas chamber 53.
The capillary tubes 41 have a conically formed apex A having an included angle within the range of 30 to 90, and preferably within the range of to 65.
' Tips 54 and 55 of the upper air plate 50 and lower air plate 51, respectively, have an angle which is the same as that of the apex A of the capillary tubes 41. Furthermore, tips 54 and 55 of the air plate can be positioned so that they are positioned essentially opposite the taper of capillary tubes 41 within the range of l to 5 mils.
The die of the present invention has several fabrication and operational advantages over other dies which are in the art or have been developed for the meltblowing process. Since the tolerances in dimensions are critical in a melt-blowing die, the dies of the present invention allow melt-blowing dies to be made having the uniform small die openings which extend for large widths (40 inches to inches or more, i.e., requiring 500 to 2,000 or more capillary tubes) without the high fabrication cost of the methods before suggested.
Furthermore, as has been discovered by another in the research project the die openings must be in line over a long distance.
Accordingly, by the fabricating method of the present invention, a novel die apparatus is produced wherein the machining operations are all relatively simple, can be carried out to very close tolerances, and still provide a die having the tolerances necessary for use in the melt-blowing process. Still further, the dies of the present invention are more readily cleaned and can be used to produce larger outputs of melt-blown materials.
It is also an advantage of the apparatus of the present invention that the hole length can be much longer than those obtained by the drilling approach.
What is claimed is: l. A melt-blowing die having a generally triangular cross-section which comprises in combination:
a die block having a chamber for thermoplastic material, and g a plurality of discrete smooth bore, uniform diameter, capillary tube means, having an internal diameter of from 0.010 to 0.025 inches and an external diameter of 0.025 to 0.050 inches each having one end and another end, rigidly held within said die block, and each of said tube means in a touching essentially planar relationship with each of said another ends in a precise alignment defining a sharp edge,
said one end of said tube means in fluid connection with said chamber and said another end of said tube means having a shaped tip with a cross sectional angle within the range of 30 to 90 in fluid communication with the exterior of said die, and
upper and lower gas slots defined by gas plates with tip means adjacent to said shaped tip in a spaced, parallel planar relationship to said shaped tip whereby said air plates form the same angle as said shaped tip.
2. A die according to claim 1 wherein said tip is triangular in cross section.
3. A die according to claim 1 wherein said tip is conical.
4. A die according to claim 1 wherein the centers of said tube means are aligned in substantially a single plane.
5. A die according to claim 1 wherein said angle is within the range of 55 to 65. l
6. A die according to claim 1 wherein said die block comprises an upper die block and a lower die block.
7. The die of claim 1 wherein said tube means are of circular cross section.
8. The die of claim 4 wherein the center of each tube means is offset from a straight line no more than 3 mils.
9. The die of claim 1 wherein said tube means are stainless steel capillary tubes aligned in a bed of solder.
10. The die of claim 9 wherein said die block has two discrete components and said tubes are rigidly mounted between said components.
11. The die of claim 1 wherein said gas plate tips are positioned essentially opposite said shaped tips.
12. The die of claim 1 which is at least 40 inches-long and has at least 500 tube means.
13. In a melt-blowing apparatus comprising:
extruder means in combination with die means,
said die means having gas attenuating means and fiber collecting means the improvement which comprises said die means having a generally triangular cross-section which comprises in combination:
a die block having a chamber for thermoplastic material, and
a plurality of discrete smooth bore, uniform diameter, capillary tube means, having an internal diameter of from 0.010 to 0.025 inches and an external diameter of 0.025 to 0.050 inches each having a one end and another end, rigidly held within said die block, and each of said tube means in a touching essentially planar relationship with each of said another ends in a precise alignment defining a sharp edge.
said one end of said tube means in fluid connection with said chamber and said another end of said tube means having a shaped tip with a cross sectional angle within the range of 30 to in fluid communication with the exterior of said die, and
upper and lower gas slots defined by gas plates with tip means adjacent to said shaped tip in a spaced, parallel planar relationship to said shaped tip whereby said air plates form the same angle as said shaped tip.
14. The melt-blowing apparatus of claim 13 wherein the die has an angle within the range of 55 to 65.
15. The melt-blowing apparatus of claim 13 wherein the tube means in said die are of circular cross-section.
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US3888610 *||24 Aug 1973||10 Jun 1975||Rothmans Of Pall Mall||Formation of polymeric fibres|
|US3942723 *||24 Apr 1974||9 Mar 1976||Beloit Corporation||Twin chambered gas distribution system for melt blown microfiber production|
|US3954361 *||23 May 1974||4 May 1976||Beloit Corporation||Melt blowing apparatus with parallel air stream fiber attenuation|
|US3970417 *||24 Apr 1974||20 Jul 1976||Beloit Corporation||Twin triple chambered gas distribution system for melt blown microfiber production|
|US3981650 *||16 Jan 1975||21 Sep 1976||Beloit Corporation||Melt blowing intermixed filaments of two different polymers|
|US3985481 *||24 Sep 1975||12 Oct 1976||Rothmans Of Pall Mall Canada Limited||Extrusion head for producing polymeric material fibres|
|US4073850 *||9 Dec 1974||14 Feb 1978||Rothmans Of Pall Mall Canada Limited||Method of producing polymeric material|
|US4295809 *||14 Sep 1979||20 Oct 1981||Toa Nenryo Kogyo Kabushiki Kaisha||Die for a melt blowing process|
|US4380570 *||8 Apr 1980||19 Apr 1983||Schwarz Eckhard C A||Apparatus and process for melt-blowing a fiberforming thermoplastic polymer and product produced thereby|
|US4486161 *||12 May 1983||4 Dec 1984||Kimberly-Clark Corporation||Melt-blowing die tip with integral tie bars|
|US4526733 *||17 Nov 1982||2 Jul 1985||Kimberly-Clark Corporation||Meltblown die and method|
|US4631013 *||29 Feb 1984||23 Dec 1986||General Electric Company||Apparatus for atomization of unstable melt streams|
|US4774001 *||13 Oct 1987||27 Sep 1988||Pall Corporation||Supported microporous membrane|
|US4774109 *||21 Jul 1987||27 Sep 1988||Nordson Corporation||Method and apparatus for applying narrow, closely spaced beads of viscous liquid to a substrate|
|US4785996 *||23 Apr 1987||22 Nov 1988||Nordson Corporation||Adhesive spray gun and nozzle attachment|
|US4815660 *||16 Jun 1987||28 Mar 1989||Nordson Corporation||Method and apparatus for spraying hot melt adhesive elongated fibers in spiral patterns by two or more side-by-side spray devices|
|US4818463 *||20 Nov 1987||4 Apr 1989||Buehning Peter G||Process for preparing non-woven webs|
|US4826415 *||21 Oct 1987||2 May 1989||Mitsui Petrochemical Industries, Ltd.||Melt blow die|
|US4844004 *||26 Apr 1988||4 Jul 1989||Nordson Corporation||Method and apparatus for applying narrow, closely spaced beads of viscous liquid to a substrate|
|US4934433 *||15 Nov 1988||19 Jun 1990||Polysar Financial Services S.A.||Devolatilization|
|US4969602 *||29 Sep 1989||13 Nov 1990||Nordson Corporation||Nozzle attachment for an adhesive dispensing device|
|US4983109 *||14 Jan 1988||8 Jan 1991||Nordson Corporation||Spray head attachment for metering gear head|
|US4987854 *||12 Dec 1988||29 Jan 1991||Nordson Corporation||Apparatus for gas-aided dispensing of liquid materials|
|US5017112 *||22 Mar 1989||21 May 1991||Mitsui Petrochemical Industries, Ltd.||Melt-blowing die|
|US5026450 *||13 Oct 1989||25 Jun 1991||Nordson Corporation||Method of applying adhesive to the waist elastic material of disposable garments|
|US5030303 *||28 Jul 1989||9 Jul 1991||Nordson Corporation||Method for forming disposable garments with a waste containment pocket|
|US5065943 *||6 Sep 1990||19 Nov 1991||Nordson Corporation||Nozzle cap for an adhesive dispenser|
|US5075068 *||11 Oct 1990||24 Dec 1991||Exxon Chemical Patents Inc.||Method and apparatus for treating meltblown filaments|
|US5080569 *||29 Aug 1990||14 Jan 1992||Chicopee||Primary air system for a melt blown die apparatus|
|US5114752 *||21 Dec 1990||19 May 1992||Nordson Corporation||Method for gas-aided dispensing of liquid materials|
|US5143776 *||24 Jun 1991||1 Sep 1992||The Procter & Gamble Company||Tissue laminates having adhesively joined tissue laminae|
|US5169071 *||13 Aug 1991||8 Dec 1992||Nordson Corporation||Nozzle cap for an adhesive dispenser|
|US5171512 *||7 Mar 1991||15 Dec 1992||Mitsui Petrochemical Industries, Ltd.||Melt-blowing method having notches on the capillary tips|
|US5176952 *||30 Sep 1991||5 Jan 1993||Minnesota Mining And Manufacturing Company||Modulus nonwoven webs based on multi-layer blown microfibers|
|US5190812 *||30 Sep 1991||2 Mar 1993||Minnesota Mining And Manufacturing Company||Film materials based on multi-layer blown microfibers|
|US5196207 *||27 Jan 1992||23 Mar 1993||Kimberly-Clark Corporation||Meltblown die head|
|US5207970 *||30 Sep 1991||4 May 1993||Minnesota Mining And Manufacturing Company||Method of forming a web of melt blown layered fibers|
|US5232770 *||30 Sep 1991||3 Aug 1993||Minnesota Mining And Manufacturing Company||High temperature stable nonwoven webs based on multi-layer blown microfibers|
|US5238190 *||16 Jun 1992||24 Aug 1993||Nordson Corporation||Offset nozzle assembly|
|US5238733 *||30 Sep 1991||24 Aug 1993||Minnesota Mining And Manufacturing Company||Stretchable nonwoven webs based on multi-layer blown microfibers|
|US5240479 *||17 May 1991||31 Aug 1993||Donaldson Company, Inc.||Pleated filter media having a continuous bead of adhesive between layers of filtering material|
|US5248455 *||19 Feb 1993||28 Sep 1993||Minnesota Mining And Manufacturing Company||Method of making transparent film from multilayer blown microfibers|
|US5258220 *||30 Sep 1991||2 Nov 1993||Minnesota Mining And Manufacturing Company||Wipe materials based on multi-layer blown microfibers|
|US5286182 *||6 Jan 1992||15 Feb 1994||Mitsubishi Kasei Corporation||Spinning nozzle for preparing a fiber precursor|
|US5316838 *||26 Mar 1993||31 May 1994||Minnesota Mining And Manufacturing Company||Retroreflective sheet with nonwoven elastic backing|
|US5350624 *||5 Oct 1992||27 Sep 1994||Kimberly-Clark Corporation||Abrasion resistant fibrous nonwoven composite structure|
|US5354378 *||8 Jul 1992||11 Oct 1994||Nordson Corporation||Slot nozzle apparatus for applying coatings to bottles|
|US5382312 *||8 Apr 1992||17 Jan 1995||Nordson Corporation||Dual format adhesive apparatus for intermittently disrupting parallel, straight lines of adhesive to form a band|
|US5407619 *||6 Oct 1993||18 Apr 1995||Mitsubishi Kasei Corporation||Process for preparing a fiber precursor of metal compound, and a process for preparing a fiber of metal|
|US5409733 *||15 Jun 1994||25 Apr 1995||Nordson Corporation||Apparatus and methods for applying conformal coatings to electronic circuit boards|
|US5418009 *||8 Jul 1992||23 May 1995||Nordson Corporation||Apparatus and methods for intermittently applying discrete adhesive coatings|
|US5421921 *||8 Jul 1992||6 Jun 1995||Nordson Corporation||Segmented slot die for air spray of fibers|
|US5423783 *||29 Mar 1994||13 Jun 1995||Minnesota Mining And Manufacturing Company||Ostomy bag with elastic and heat sealable medical tapes|
|US5423935 *||8 Apr 1994||13 Jun 1995||Nordson Corporation||Methods for applying discrete coatings|
|US5429840 *||26 May 1994||4 Jul 1995||Nordson Corporation||Apparatus and methods for applying discrete foam coatings|
|US5458721 *||22 Sep 1994||17 Oct 1995||Nordson Corporation||Dual format adhesive process for intermittently disrupting parallel lines of adhesive to form adhesive bands|
|US5478224 *||4 Feb 1994||26 Dec 1995||Illinois Tool Works Inc.||Apparatus for depositing a material on a substrate and an applicator head therefor|
|US5508102 *||20 Jun 1994||16 Apr 1996||Kimberly-Clark Corporation||Abrasion resistant fibrous nonwoven composite structure|
|US5524828 *||8 Mar 1995||11 Jun 1996||Nordson Corporation||Apparatus for applying discrete foam coatings|
|US5533675 *||25 May 1995||9 Jul 1996||Nordson Corporation||Apparatus for applying discrete coatings|
|US5540804 *||7 Mar 1995||30 Jul 1996||Nordson Corporation||Dual format adhesive apparatus, process and article|
|US5582907 *||28 Jul 1994||10 Dec 1996||Pall Corporation||Melt-blown fibrous web|
|US5586997 *||16 Feb 1995||24 Dec 1996||Pall Corporation||Bag filter|
|US5591335 *||2 May 1995||7 Jan 1997||Memtec America Corporation||Filter cartridges having nonwoven melt blown filtration media with integral co-located support and filtration|
|US5607766 *||6 Jun 1995||4 Mar 1997||American Filtrona Corporation||Polyethylene terephthalate sheath/thermoplastic polymer core bicomponent fibers, method of making same and products formed therefrom|
|US5620641 *||29 Jul 1996||15 Apr 1997||American Filtrona Corporation||Polyethylene terephthalate sheath/thermoplastic polymer core bicomponent fibers, method of making same and products formed therefrom|
|US5629079 *||18 Jan 1995||13 May 1997||Minnesota Mining And Manufacturing Company||Elastic and heat sealable medical tapes|
|US5633082 *||29 Jul 1996||27 May 1997||American Filtrona Corporation||Polyethylene terephthalate sheath/thermoplastic polymer core bicomponent fibers, method of making same and products formed therefrom|
|US5652050 *||1 Mar 1996||29 Jul 1997||Pall Corporation||Fibrous web for processing a fluid|
|US5667749 *||2 Aug 1995||16 Sep 1997||Kimberly-Clark Worldwide, Inc.||Method for the production of fibers and materials having enhanced characteristics|
|US5681469 *||2 Jul 1996||28 Oct 1997||Memtec America Corporation||Melt-blown filtration media having integrally co-located support and filtration fibers|
|US5683036 *||10 Jun 1996||4 Nov 1997||Nordson Corporation||Apparatus for applying discrete coatings|
|US5685911 *||27 Jan 1995||11 Nov 1997||Nordson Corporation||Apparatus for intermittently applying discrete adhesive coatings|
|US5711970 *||2 Aug 1995||27 Jan 1998||Kimberly-Clark Worldwide, Inc.||Apparatus for the production of fibers and materials having enhanced characteristics|
|US5733581 *||2 Jul 1996||31 Mar 1998||Memtec America Corporation||Apparatus for making melt-blown filtration media having integrally co-located support and filtration fibers|
|US5807795 *||2 Jun 1997||15 Sep 1998||Kimberly-Clark Worldwide, Inc.||Method for producing fibers and materials having enhanced characteristics|
|US5811178 *||15 Nov 1996||22 Sep 1998||Kimberly-Clark Worldwide, Inc.||High bulk nonwoven sorbent with fiber density gradient|
|US5846438 *||20 Jan 1995||8 Dec 1998||Pall Corporation||Fibrous web for processing a fluid|
|US5863565 *||15 May 1996||26 Jan 1999||Conoco Inc.||Apparatus for forming a single layer batt from multiple curtains of fibers|
|US5882573 *||29 Sep 1997||16 Mar 1999||Illinois Tool Works Inc.||Adhesive dispensing nozzles for producing partial spray patterns and method therefor|
|US5902540 *||8 Oct 1996||11 May 1999||Illinois Tool Works Inc.||Meltblowing method and apparatus|
|US5904298 *||14 Apr 1997||18 May 1999||Illinois Tool Works Inc.||Meltblowing method and system|
|US5911224 *||1 May 1997||15 Jun 1999||Filtrona International Limited||Biodegradable polyvinyl alcohol tobacco smoke filters, tobacco smoke products incorporating such filters, and methods and apparatus for making same|
|US5913329 *||19 Mar 1997||22 Jun 1999||Kimberly-Clark Worldwide, Inc.||High temperature, high speed rotary valve|
|US5951942 *||23 Jun 1998||14 Sep 1999||Conoco Inc.||Process for forming a single layer batt from multiple curtains of fibers|
|US6022818 *||2 Apr 1996||8 Feb 2000||Kimberly-Clark Worldwide, Inc.||Hydroentangled nonwoven composites|
|US6026819 *||18 Feb 1998||22 Feb 2000||Filtrona International Limited||Tobacco smoke filter incorporating sheath-core bicomponent fibers and tobacco smoke product made therefrom|
|US6051180 *||13 Aug 1998||18 Apr 2000||Illinois Tool Works Inc.||Extruding nozzle for producing non-wovens and method therefor|
|US6074597 *||20 Feb 1999||13 Jun 2000||Illinois Tool Works Inc.||Meltblowing method and apparatus|
|US6074869 *||27 Jul 1995||13 Jun 2000||Pall Corporation||Fibrous web for processing a fluid|
|US6102039 *||1 Dec 1997||15 Aug 2000||3M Innovative Properties Company||Molded respirator containing sorbent particles|
|US6133173 *||1 Dec 1997||17 Oct 2000||3M Innovative Properties Company||Nonwoven cohesive wrap|
|US6171985||1 Dec 1997||9 Jan 2001||3M Innovative Properties Company||Low trauma adhesive article|
|US6174603||25 Aug 1999||16 Jan 2001||Filtrona International Limited||Sheath-core bicomponent fibers with blended ethylene-vinyl acetate polymer sheath, tobacco smoke filter products incorporating such fibers and tobacco smoke products made therefrom|
|US6197406||16 Mar 2000||6 Mar 2001||Illinois Tool Works Inc.||Omega spray pattern|
|US6198016||10 Jun 1999||6 Mar 2001||3M Innovative Properties Company||Wet skin adhesive article|
|US6200635||31 Aug 1998||13 Mar 2001||Illinois Tool Works Inc.||Omega spray pattern and method therefor|
|US6234171||11 May 2000||22 May 2001||3M Innovative Properties Company||Molded respirator containing sorbent particles|
|US6342561||16 Feb 2000||29 Jan 2002||3M Innovative Properties Company||Organic particulate-filled adhesive|
|US6358417||21 Apr 1999||19 Mar 2002||Osmonics, Inc.||Non-woven depth filter element|
|US6364647||8 Oct 1998||2 Apr 2002||David M. Sanborn||Thermostatic melt blowing apparatus|
|US6368687||1 Dec 1998||9 Apr 2002||3M Innovative Properties Company||Low trauma adhesive article|
|US6383958||18 Jun 1999||7 May 2002||David P. Swanson||Nonwoven sheets, adhesive articles, and methods for making the same|
|US6454096||1 Jun 2000||24 Sep 2002||3M Innovative Properties Company||Package for dispensing individual sheets|
|US6461430||16 Mar 2000||8 Oct 2002||Illinois Tool Works Inc.||Omega spray pattern and method therefor|
|US6503855||19 Nov 1999||7 Jan 2003||3M Innovative Properties Company||Laminated composites|
|US6533119||8 May 2000||18 Mar 2003||3M Innovative Properties Company||BMF face oil remover film|
|US6565344||9 Mar 2001||20 May 2003||Nordson Corporation||Apparatus for producing multi-component liquid filaments|
|US6602554||14 Jan 2000||5 Aug 2003||Illinois Tool Works Inc.||Liquid atomization method and system|
|US6635704||29 Nov 2001||21 Oct 2003||3M Innovative Properties Company||Organic particulate-filled adhesive|
|US6638611||7 Jun 2001||28 Oct 2003||3M Innovative Properties Company||Multipurpose cosmetic wipes|
|US6645611||9 Feb 2001||11 Nov 2003||3M Innovative Properties Company||Dispensable oil absorbing skin wipes|
|US6652800||12 Mar 2001||25 Nov 2003||Kimberly-Clark Worldwide, Inc.||Method for producing fibers|
|US6680021||20 Oct 2000||20 Jan 2004||Illinois Toolworks Inc.||Meltblowing method and system|
|US6756098||25 Jun 2002||29 Jun 2004||3M Innovative Properties Company||Pressure sensitive adhesives with a fibrous reinforcing material|
|US6814555||9 Mar 2001||9 Nov 2004||Nordson Corporation||Apparatus and method for extruding single-component liquid strands into multi-component filaments|
|US6835256||29 Oct 2002||28 Dec 2004||3M Innovative Properties Company||Laminated composites|
|US6890167||18 Mar 2000||10 May 2005||Illinois Tool Works Inc.||Meltblowing apparatus|
|US6894204||2 May 2001||17 May 2005||3M Innovative Properties Company||Tapered stretch removable adhesive articles and methods|
|US6916395||23 Oct 2002||12 Jul 2005||Osmonics, Inc.||Process for making three-dimensional non-woven media|
|US6938781||23 Oct 2002||6 Sep 2005||Osmonics, Incorporated||Three-dimensional non-woven filter|
|US6972104||23 Dec 2003||6 Dec 2005||Kimberly-Clark Worldwide, Inc.||Meltblown die having a reduced size|
|US6986427||23 Oct 2002||17 Jan 2006||Ge Osmonics, Inc.||Three-dimensional non-woven media|
|US7001555||18 Mar 2003||21 Feb 2006||Nordson Corporation||Apparatus for producing multi-component liquid filaments|
|US7018031||22 Dec 2003||28 Mar 2006||Filtrona Richmond, Inc.||Porous substrate for ink delivery systems|
|US7018188||8 Apr 2003||28 Mar 2006||The Procter & Gamble Company||Apparatus for forming fibers|
|US7078582||21 Aug 2001||18 Jul 2006||3M Innovative Properties Company||Stretch removable adhesive articles and methods|
|US7157093||4 Dec 1998||2 Jan 2007||3M Innovative Properties Company||Oil cleaning sheets for makeup|
|US7192896||15 Nov 2001||20 Mar 2007||3M Innovative Properties Company||Disposable cleaning product|
|US7316552||23 Dec 2004||8 Jan 2008||Kimberly-Clark Worldwide, Inc.||Low turbulence die assembly for meltblowing apparatus|
|US7798434||13 Dec 2006||21 Sep 2010||Nordson Corporation||Multi-plate nozzle and method for dispensing random pattern of adhesive filaments|
|US7939010||17 Nov 2005||10 May 2011||The Procter & Gamble Company||Method for forming fibers|
|US8074902||14 Apr 2008||13 Dec 2011||Nordson Corporation||Nozzle and method for dispensing random pattern of adhesive filaments|
|US8257626||7 Sep 2010||4 Sep 2012||Groz-Beckert Kg||Felt body manufacturing method|
|US8435600||3 Nov 2011||7 May 2013||Nordson Corporation||Method for dispensing random pattern of adhesive filaments|
|US8721943||17 Dec 2010||13 May 2014||3M Innovative Properties Company||Process of making dimensionally stable nonwoven fibrous webs|
|US8728960||19 Jan 2007||20 May 2014||Exxonmobil Chemical Patents Inc.||Spunbond fibers and fabrics from polyolefin blends|
|US8858986||11 Jun 2009||14 Oct 2014||3M Innovative Properties Company||Biocompatible hydrophilic compositions|
|US8882005||16 Sep 2010||11 Nov 2014||Groz-Beckert Kg||Nozzle bar for a textile processing machine|
|US8979004 *||27 Apr 2009||17 Mar 2015||Illinois Tool Works Inc.||Pneumatic atomization nozzle for web moistening|
|US9186881||27 Apr 2009||17 Nov 2015||Illinois Tool Works Inc.||Thermally isolated liquid supply for web moistening|
|US9194065||17 Dec 2010||24 Nov 2015||3M Innovative Properties Company||Dimensionally stable nonwoven fibrous webs and methods of making and using the same|
|US9382644||10 Sep 2015||5 Jul 2016||Thomas M. Tao||Die tip for melt blowing micro- and nano-fibers|
|US9416485||31 Mar 2014||16 Aug 2016||3M Innovative Properties Company||Process of making dimensionally stable nonwoven fibrous webs|
|US9487893||23 Mar 2010||8 Nov 2016||3M Innovative Properties Company||Dimensionally stable nonwoven fibrous webs and methods of making and using the same|
|US9492836||8 Feb 2013||15 Nov 2016||National Taiwan University||Coating module|
|US9611572||14 Oct 2011||4 Apr 2017||3M Innovative Properties Company||Dimensionally stable nonwoven fibrous webs, and methods of making and using the same|
|US9816216||14 Sep 2010||14 Nov 2017||Groz-Beckert Kg||Nozzle foil for a nozzle bar with connectable foil segments|
|US20020125601 *||9 Mar 2001||12 Sep 2002||Allen Martin A.||Apparatus and method for extruding single-component liquid strands into multi-component filaments|
|US20020144384 *||11 Dec 2001||10 Oct 2002||The Dow Chemical Company||Thermally bonded fabrics and method of making same|
|US20030080050 *||23 Oct 2002||1 May 2003||Osmonics, Inc.||Three-dimensional non-woven filter|
|US20030080051 *||23 Oct 2002||1 May 2003||Osmonics, Inc.||Three-dimensional non-woven media|
|US20030080464 *||23 Oct 2002||1 May 2003||Osmonics, Inc.||Process for making three-dimensional non-woven media|
|US20030091617 *||7 Jun 2001||15 May 2003||Mrozinski James S.||Gel-coated oil absorbing skin wipes|
|US20030100236 *||15 Nov 2001||29 May 2003||Jayshree Seth||Disposable cleaning product|
|US20030104746 *||29 Oct 2002||5 Jun 2003||3M Innovative Properties Company||Laminated composites|
|US20030180407 *||18 Mar 2003||25 Sep 2003||Nordson Corporation||Apparatus for producing multi-component liquid filaments|
|US20040024633 *||23 Oct 2002||5 Feb 2004||Whymark Thomas J.||Multi-market broadcast tracking, management and reporting method and system|
|US20040201127 *||8 Apr 2003||14 Oct 2004||The Procter & Gamble Company||Apparatus and method for forming fibers|
|US20050084647 *||12 Oct 2004||21 Apr 2005||3M Innovative Properties Company||Laminated composites|
|US20050118917 *||2 Jan 2003||2 Jun 2005||Ahamad Khan||Breathable non-wettable melt-blown non-woven materials and products employing the same|
|US20050133971 *||23 Dec 2003||23 Jun 2005||Haynes Bryan D.||Meltblown die having a reduced size|
|US20050151805 *||22 Dec 2003||14 Jul 2005||Ward Bennett C.||Porous substrate for ink delivery systems|
|US20060031111 *||23 Oct 2002||9 Feb 2006||Whymark Thomas J||Multi-market broadcast tracking, management and reporting method and system|
|US20060141086 *||23 Dec 2004||29 Jun 2006||Kimberly-Clark Worldwide, Inc.||Low turbulence die assembly for meltblowing apparatus|
|US20060240733 *||25 Apr 2005||26 Oct 2006||Fina Technology, Inc.||Fibers and fabrics prepared from blends of homopolymers and copolymers|
|US20060276095 *||2 Jun 2005||7 Dec 2006||Nike, Inc.||Article of footwear of nonwoven material and method of manufacturing same|
|US20070125886 *||27 Nov 2006||7 Jun 2007||3M Innovative Properties Company||Methods of spraying multi-component liquids|
|US20070125888 *||21 Nov 2006||7 Jun 2007||3M Innovative Properties Company||Multi-component liquid spray systems|
|US20080145530 *||13 Dec 2006||19 Jun 2008||Nordson Corporation||Multi-plate nozzle and method for dispensing random pattern of adhesive filaments|
|US20080172840 *||19 Jan 2007||24 Jul 2008||Smita Kacker||Spunbond fibers and fabrics from polyolefin blends|
|US20100224122 *||27 Apr 2009||9 Sep 2010||Illinois Tool Works Inc.||Low pressure regulation for web moistening systems|
|US20100224123 *||27 Apr 2009||9 Sep 2010||Illinois Tool Works Inc.||Modular nozzle unit for web moistening|
|US20100224665 *||27 Apr 2009||9 Sep 2010||Illinois Tool Works Inc.||Thermally isolated liquid supply for web moistening|
|US20100224702 *||27 Apr 2009||9 Sep 2010||Illinois Tool Works Inc.||Pneumatic atomization nozzle for web moistening|
|US20100224703 *||9 Mar 2009||9 Sep 2010||Illinois Tool Works Inc.||Pneumatic Atomization Nozzle for Web Moistening|
|US20110037194 *||13 Aug 2010||17 Feb 2011||Michael David James||Die assembly and method of using same|
|US20110067213 *||14 Sep 2010||24 Mar 2011||Groz-Beckert Kg||Nozzle foil for a nozzle bar with connectable foil segments|
|US20110067458 *||16 Sep 2010||24 Mar 2011||Groz-Beckert Kg||Nozzle bar for a textile processing machine|
|US20110092076 *||19 May 2009||21 Apr 2011||E.I. Du Pont De Nemours And Company||Apparatus and method of vapor coating in an electronic device|
|US20110151737 *||17 Dec 2010||23 Jun 2011||3M Innovative Properties Company||Dimensionally stable nonwoven fibrous webs and methods of making and using the same|
|US20110151738 *||17 Dec 2010||23 Jun 2011||3M Innovative Properties Company||Dimensionally stable nonwoven fibrous webs, melt blown fine fibers, and methods of making and using the same|
|US20110189463 *||11 Jun 2009||4 Aug 2011||Moore Eric M||Melt blown fine fibers and methods of manufacture|
|USRE33481 *||28 Apr 1989||11 Dec 1990||Nordson Corporation||Adhesive spray gun and nozzle attachment|
|CN103498202A *||29 Sep 2013||8 Jan 2014||无锡众望四维科技有限公司||Melt-blown head of melt-blown machine|
|CN103507259A *||21 Sep 2013||15 Jan 2014||北京化工大学||Efficient large pipe-extrusion forming device|
|CN103507259B *||21 Sep 2013||17 Jun 2015||北京化工大学||Efficient large pipe-extrusion forming device|
|DE19609143C1 *||8 Mar 1996||13 Nov 1997||Rhodia Ag Rhone Poulenc||Melt-blown-Vlies, Verfahren zu dessen Herstellung und dessen Verwendungen|
|DE19956368A1 *||24 Nov 1999||13 Jun 2001||Sandler C H Gmbh||Melt blown thermoplastic plastic fiber fleece production involves blowing fiber flow leaving nozzle to form angle with nozzle axis|
|DE19956368C2 *||24 Nov 1999||3 Jan 2002||Sandler C H Gmbh||Verfahren zur Herstellung von schmelzgeblasenen Vliesstoffen, daraus hergestellte schmelzgeblasene Vliesstoffe und Verwendung der schmelzgeblasenen Vliesstoffe|
|EP0334653A2 *||23 Mar 1989||27 Sep 1989||Mitsui Petrochemical Industries, Ltd.||Spinning method employing melt-blowing method and melt-blowing die|
|EP0334653A3 *||23 Mar 1989||29 Aug 1990||Mitsui Petrochemical Industries, Ltd.||Spinning method employing melt-blowing method and melt-blowing die|
|EP0701010A1||11 Oct 1991||13 Mar 1996||Exxon Chemical Patents Inc.||Meltblowing Die|
|EP2302121A1||15 Sep 2009||30 Mar 2011||Groz-Beckert KG||Felt body production method|
|WO1996039054A1||4 Jun 1996||12 Dec 1996||Filtrona International Limited|
|WO1999027880A1||3 Apr 1998||10 Jun 1999||Minnesota Mining And Manufacturing Company||Nasal dilator|
|WO2008091432A2||14 Nov 2007||31 Jul 2008||Exxonmobil Chemical Patents Inc.||Spunbond fibers and fabrics from polyolefin blends|
|WO2009026207A1||18 Aug 2008||26 Feb 2009||Exxonmobil Chemical Patents Inc.||Soft and elastic nonwoven polypropylene compositions|
|WO2012051479A1||14 Oct 2011||19 Apr 2012||3M Innovative Properties Company||Dimensionally stable nonwoven fibrous webs, and methods of making and using the same|
|WO2012078826A2||8 Dec 2011||14 Jun 2012||3M Innovative Properties Company||Adhesive article for three-dimensional applications|
|U.S. Classification||425/72.2, 264/DIG.750, 425/464, 264/211.17|
|International Classification||D01D4/02, B29C47/00, B29B7/00, D04H3/03, B29C47/20, B29C47/30, D01D5/08, B29C47/12|
|Cooperative Classification||D01D4/025, B29C47/14, B29C47/0014, B29C47/085, B29C47/0837, B29C47/0828, B29C47/30, Y10S264/75|