Thermally apertured nonwoven product

Details Thermally apertured nonwoven product Thermally apertured nonwoven product

1994-06-15

1996-10-22

Nakarani, Dhirajlal

Stock material or miscellaneous articles

Structurally defined web or sheet

Including aperture

428286, 428287, 428302, 604365, 604366, 604370, 604372, 604373, 604379, 604383, B32B 310, B32B 2308, B32B 2732, B32B 3120

Patent

active

055675018

ABSTRACT:
A process for producing an apertured nonwoven fabric combines one or two outer nonwoven layer(s) with a layer of polymeric material having a lower melting temperature and a property of shrinking when melted. Heat and pressure are applied through a calendar roll such that the polymeric material becomes bonded to the fibers of the nonwoven layer(s) and simultaneously shrinks and takes back the fibers away from the calendaring points, thereby generating apertures through the nonwoven fabric. Preferably, the fibers are polyethylene or polypropylene fibers, and the layer of polymeric material is a thin plastic film of polyethylene stretch-wrap, elastomeric, or heat shrink material. One outer nonwoven layer may be combined with the plastic film layer to form a bi-laminate product, or two outer nonwoven layers may be combined with an intermediate plastic film to form a tri-laminate product. Low denier polypropylene/polyethylene bi-component fibers or a blend of higher and lower melting fibers may also be used. Apertured products can also be obtained with non-thermoplastic outer layers and an intermediate plastic film layer.

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Encyclopedia of Polymer Science and Engineering vol. 7 p. 98 .COPYRGT.1987.

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