Method for producing longitudinally ribbed plastic film

Details Method for producing longitudinally ribbed plastic film Method for producing longitudinally ribbed plastic film

1983-10-06

1985-08-20

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Layered, stratified traversely of length, or multiphase...

15624411, 15624412, 264177R, 425461, 425462, B29F 304

Patent

active

045363625

ABSTRACT:
A longitudinally ribbed plastic film is produced by extruding through a pair of die lips, at least one of which is provided with slots which run at an angle to the direction of resin flow across the die lips. Impurities in the resin tend to collect in the slots, and thus in the ribs of the film. This occurs because of the shear stress field created by the slots. A high melt viscosity component of a multi-layer coextrusion behaves in a fashion similar to the impurities and is substantially extruded in the ribs.

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patent: 4217322 (1980-08-01), Sugano et al.
patent: 4322202 (1982-03-01), Martinez

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