US4898761A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Barrier fabric and method
Assignee: Fiberweb LLC
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Filing: 1988-12-07
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Granted: 1990-02-06
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Expires: 2008-12-07
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
US
Data Source
google_patents
Last Synchronized
2026-11-04 00:34
CPC Classifications
D; D06; D06N; D06N3/00; D06N3/0043; D06N3/0054; B; B32; B32B; B32B27/00; B32B27/02; D06N3/0052; D06N3/04; D06N3/045; D06N2209/00; D06N2209/10; D06N2209/103; D06N2209/12; D06N2209/121; D06N2209/123; D06N2209/126; D06N2209/128; D06N2211/00; D06N2211/06; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24273; Y10T428/24322; Y10T428/249921; Y10T428/249953; Y10T428/249978; Y10T442/00; Y10T442/60; Y10T442/659; Y10T442/66; Y10T442/662
Claims Analysis
Total Claims: 16
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 needl.ing 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 needl.ing 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
56 words
A barrier fabric comprising a porous fibrous layer, a moisture impermeable film laminated to 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 the transmission of water vapor and of a size insufficient to allow substantial penetration of liquid water.
Claim 11
Dependent Claim
56 words
A barrier fabric comprising a porous fibrous layer, a moisture impermeable film laminated to 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 the transmission of water vapor and of a size insufficient to allow substantial penetration of liquid water.
Claim 12
Dependent Claim
22 words
the barrier fabric of claim 9 wherein said film is polypropylene having a thickness of from about 0.3 to about 1 mil.
Claim 13
Dependent Claim
53 words
Method of producing a fabric with limited permeability, 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.
Claim 14
Dependent Claim
53 words
Method of producing a fabric with limited permeability, 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.
Claim 15
Independent Claim
63 words
A method for transporting rolls of fabric comprising the steps of first assembling a plurality of rolls of fabric into a bundle around a hollow tube which is coextensive with the rolls and wherein the rolls are arranged in a stable geometrical pattern around the tube, securing the bundle, and lifting and transporting the bundle by inserting a support into the hollow tube.
Claim 16
Independent Claim
63 words
A method for transporting rolls of fabric comprising the steps of first assembling a plurality of rolls of fabric into a bundle around a hollow tube which is coextensive with the rolls and wherein the rolls are arranged in a stable geometrical pattern around the tube, securing the bundle, and lifting and transporting the bundle by inserting a support into the hollow tube.
References Cited (Backward Citations)
US4582750A
Cited
US4684568A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-02-05 | 1993-08-07 | 1994-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-05 | 1997-08-07 | 1998-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-05 | 2001-08-07 | 2002-02-06 | $7700.00 | Window Closed / Lapsed |