Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Reshaping running or indefinite-length work
Patent
1976-07-30
1979-05-08
Woo, Jay H.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Reshaping running or indefinite-length work
264282, 264DIG47, B29G 700
Patent
active
041536649
ABSTRACT:
A process for differentially drawing films and non-woven fiberous webs for increased drapability and strength of webs including at least in part cold drawable polymeric materials or blends thereof including incompatible polymer blends and polymeric matrixes having inorganic fillers draws portions of the web and leaves other portions undrawn. The process involves the subjecting of the web to two or more pairs of meshing toothed rollers to produce a fabric having a pattern of spaced apart undrawn quadrilateral shaped islands bounded fully on each of their four sides by an axially drawn area. Each undrawn island is contiguous at each of its four apices to a biaxially drawn area. The preferred tooth form for the rollers is involute or cycloidal. The processed film or web is larger in area than the original, has a lower basis weight, and has greatly enhanced strength, softness, bulk, texture and drapability.
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