Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1994-02-23
1996-03-19
Bell, James J.
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
428131, 428296, 428299, 428913, 1563082, 1563086, 1563088, 1563096, 156285, 264123, 264126, 28104, D04H 158
Patent
active
055002811
ABSTRACT:
An absorbent, flushable, bio-degradable, and medically-safe nonwoven fabric suitable for use as wraps, wipes, absorbent pads, etc., is composed of from 2% to 10% by weight of untreated, water-soluble polyvinyl alcohol (PVA) fibers that are heat-bonded to a matrix of absorbent fibers. The use of PVA fibers in low amounts provides softness, while sufficient wet strength is provided by heat bonding the PVA fibers completely to the other fibers in a two-stage heating process. The resulting nonwoven fabric has a high wet-to-dry tensile strength ratio, good drape softness, and high fluid absorptive capacity. In a method for producing the nonwoven fabric, the PVA fibers are blended with the absorbent fibers, the blended fibers are carded onto a moving web, sufficient water is added to wet the PVA fibers while maintaining web integrity, then the web is heated in two stages, the first with heating cylinders at 40.degree. C. to 80.degree. C., then the second with heating cylinders of 60.degree. C. to 100.degree. C. The fiber web may also be hydroentangled and patterned for enhanced strength and textural properties.
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Bottomley James
Coslett W. Andrew
Srinivasan Ramesh
Bell James J.
International Paper Company
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