EP0306818A2
Expired / Lapsed
EP
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Barrier fabric and method
Assignee: Reemay Inc
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Filing: 1988-08-31
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Granted: —
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Expires: 2008-08-31
Abstract
Abstract A barrier fabric is provided which is impermeable to liquids and permeable to vapor. A polymer film is laminated to a porous fibrous web. The composite web is then needled repeatedly with fine conical needles to provide micropores through the film.
Inventors
- 👤 Jerry A. Dunaway
- 👤 Leon H. Zimmerman
- 👤 Nancy T. Latondress
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 09:55
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/02; B32B27/12; B32B27/32; B32B5/00; B32B5/02; B32B5/022; D; D06; D06N; D06N3/00; D06N3/0043; D06N3/0052; D06N3/0054; D06N7/00; B32B2262/00; B32B2262/02; B32B2262/0253; B32B2307/00; B32B2307/70; B32B2307/724; B32B2307/7242; B32B2307/7246; B32B2307/726; B32B2307/7265; B32B2323/00; B32B2323/10; B32B2419/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
80 words
Method of producing a barrier fabric which is permeable to liquid vapors and impermeable to liquids, said method comprising the steps of first laminating a vapor impermeable polymer film to a reinforcing porous fibrous web to provide a composite web and then needling the film of the composite web with tapered needles to provide a plurality of micropores through said film, said micropores being sufficiently small to prevent substantial transmission of liquids and sufficiently large to permit transmission of vapors.
Claim 2
Dependent Claim
80 words
Method of producing a barrier fabric which is permeable to liquid vapors and impermeable to liquids, said method comprising the steps of first laminating a vapor impermeable polymer film to a reinforcing porous fibrous web to provide a composite web and then needling the film of the composite web with tapered needles to provide a plurality of micropores through said film, said micropores being sufficiently small to prevent substantial transmission of liquids and sufficiently large to permit transmission of vapors.
Claim 3
Dependent Claim
42 words
The method of Claim 1 wherein said film is needled by puncturing the film with a plurality of said needles, the diameter of said needles at the area of puncture being in the order of from about 0.004 to about 0.02 inches.
Claim 4
Dependent Claim
14 words
The method of Claim 1 wherein the porous fibrous web is non-woven spunbonded polypropylene.
Claim 5
Dependent Claim
10 words
The method of Claim 1 wherein said film is polypropylene.
Claim 6
Dependent Claim
23 words
The method of Claim 1 wherein the number of micropores per square inch in the film is from about 25 to about 90.
Claim 7
Dependent Claim
33 words
The method of Claim 1 wherein the web is wound into a plurality of rolls, said rolls are arranged around a hollow tube to form a bundle, and said bundle is secured together.
Claim 8
Dependent Claim
25 words
The method of Claim 1 wherein the moisture transmission rate of the composite web is from about 8 to about 20 g/100 sq. in./24 hrs.
Claim 9
Dependent Claim
26 words
The method of Claim 1 wherein the angle of said needles from the apex of the tips thereof is from about 4 to about 10 degrees.
Claim 10
Dependent Claim
8 words
The product of the process of Claim 1.
Claim 11
Dependent Claim
56 words
A barrier fabric comprising a porous fibrous layer, a moisture impermeable film secured over said fibrous layer to provide a composite fabric, and a plurality of punctures through said film, said punctures being of a size sufficient to allow th transmission of water vapor and of a size insufficient to allow substantial penetration of liquid water.
Claim 12
Dependent Claim
56 words
A barrier fabric comprising a porous fibrous layer, a moisture impermeable film secured over said fibrous layer to provide a composite fabric, and a plurality of punctures through said film, said punctures being of a size sufficient to allow th transmission of water vapor and of a size insufficient to allow substantial penetration of liquid water.
Claim 13
Dependent Claim
22 words
The barrier fabric of Claim 10 wherein said film is polypropylene having a thickness of from about 0.3 to about 1 mil.
References Cited (Backward Citations)
No citation records indexed.
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