Method for fabricating stiff polymeric plastic slats for venetia

Details Method for fabricating stiff polymeric plastic slats for venetia Method for fabricating stiff polymeric plastic slats for venetia

1988-01-11

1988-12-06

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Reshaping running or indefinite-length work

264339, 264340, B29C 5304, B29C 5318

Patent

active

047895152

ABSTRACT:
A method of producing stiff polymeric plastic slats incorporates the steps of (a) feeding a reel of planar polymeric plastic film into a roller system which includes at least one pair of rotatable entrance guide rollers; (b) guiding the polymeric plastic film through at least one pair of rotatable line marker rollers; (c) passing the film through at least one pair of truncated rollers to produce a bend in said film of 100 degrees or more; (d) passing the film through a pair of nipping rollers to convert said bend to a fold of between 120 and 180 degrees to thereby produce tension and compression in a ridge region; and, (e) flattening said film out to its final, fixed shape by drawing through a pair of soft, rotatable wheels.

REFERENCES:
patent: 2779388 (1957-01-01), Quoff
patent: 2848751 (1958-08-01), Vernon
patent: 3197536 (1965-07-01), French
patent: 4711005 (1987-12-01), Chang

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