Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1995-01-10
1996-10-01
Cannon, James C.
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
2901, 128849, 156 731, 156291, 422 34, 428286, 4283155, 4283157, 4283159, 428340, A41D 1312, A61B 1908, B32B 532, B32B 704, B32B 3120
Patent
active
055609740
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 ES21-92 and ES22-92 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 adhesively bonded by unwinding and contacting at least one continuous thermoplastic non-woven web to at least one side of a continuous thermoplastic microporous film with spot adhesive or pattern adhesive applications between the film and webs, continuously transporting said contacted webs and film through a bonding and curing zone and bonding the webs and film at multiple spaced-apart locations, said bonding zone having a dwell time sufficient to cure the adhesive bond of the composite while avoiding degradation of the film and webs.
REFERENCES:
patent: 5409761 (1995-04-01), Langley
Cannon James C.
Croskell Henry
Kappler Safety Group, Inc.
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