Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1993-07-02
1995-04-25
Cannon, James C.
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
2901, 128849, 156 731, 422 34, 428286, 4283155, 4283157, 4283159, 428340, A41D 1312, A61B 1908, B32B 532, B32B 704, B32B 3120
Patent
active
054097614
ABSTRACT:
A breathable non-woven composite 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 of biological liquid when the composite fabric is subjected to contact with synthetic blood under the dictates of testing procedure ASTM ES 21 92 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 having a breaking strength of at least about 14 pounds. A process is provided for forming 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 bum-through degradation of the film and webs.
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Cannon James C.
Croskell Henry
Kappler Safety Group
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