Method and apparatus for interdigitally stretching polymer films and nonwoven webs
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United States of America Patent
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app pub date -
Jul 23, 2001
filing date -
Jul 29, 1998
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Abandoned
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Abstract
The method and apparatus prevent the formation of pin-holes or other breakage during stretching of polymeric films, non-woven fibrous webs or laminates in the cross machine direction. Pin-holes and other breakage are prevented by creating slack areas along the length of the product where the edges of the non-woven strips meet with the polymer film, pressing the slack areas into the interdigital stretching rollers without stretching the slack areas, and stretching the remainder of the web in a typical manner. The slack regions are formed prior to interdigitation by, for example, formation of a furrow, a fold or a corrugation.
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