Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1997-03-26
1998-03-17
Lee, Helen
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
156290, B32B 2714
Patent
active
057284512
ABSTRACT:
A breathable non-woven fabric having barrier capabilities to biological liquids comprised of at least one non-woven layer bonded to at least one surface of a thermoplastic microporous film, the non-woven composite fabric providing a barrier to passage: (a) of biological liquid when the composite fabric is subjected to contact with synthetic blood under the dictates of testing procedure ASTM ES21-92; and (b) to viral penetration when the composite fabric is subject to contact with .phi.X174 bacteriophage suspension at a titer of 10.sup.3 PFU/mL for 5 minutes with no applied pressure, 1 minute at 13.8 kPa (2.0 PSIG), and 54 minutes with no applied pressure while maintaining a moisture of vapor transmission rate of greater than about 450 grams per square meter for 24 hours at about 75.degree. F. and about 65% relative humidity, the non-woven composite fabric which has been thermally bonded by unwinding and contacting at least one continuous thermoplastic non-woven web to at least one side of a continuous thermoplastic microporous film, continuously transporting said contacted webs and film through a thermal bonding zone and thermally bonding the webs and film at multiple spaced-apart locations, said bonding having a dwell time sufficient to thermally bond said composite while avoiding burn-through degradation of the film and webs.
REFERENCES:
patent: 3634184 (1972-01-01), Wang
patent: 3770537 (1973-11-01), Elton
patent: 4041203 (1977-08-01), Brock et al.
patent: 4308303 (1981-12-01), Mastroianni et al.
patent: 4379192 (1983-04-01), Wahlquist et al.
patent: 4539256 (1985-09-01), Shipman
patent: 4828556 (1989-05-01), Braun et al.
patent: 4867881 (1989-09-01), Kinzer
patent: 5169712 (1992-12-01), Tapp
patent: 5208098 (1993-05-01), Stover
patent: 5409761 (1995-04-01), Langley
Hinkle Barry Scott
Langley John D.
Croskell, Esq. Henry
Lee Helen
LandOfFree
Breathable non-woven composite viral penetration barrier fabric does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Breathable non-woven composite viral penetration barrier fabric , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Breathable non-woven composite viral penetration barrier fabric will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-955845