Method of lengthwise folding thermoplastic strip material and ap

Details Method of lengthwise folding thermoplastic strip material and ap Method of lengthwise folding thermoplastic strip material and ap

1987-01-08

1988-10-25

Spitzer, Robert

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Reshaping running or indefinite-length work

264295, 264339, B29C 5300

Patent

active

047802618

ABSTRACT:
A flat stock strip of thermoplastic material is passed through a heating station in contact with the edges of longitudinally oriented heated knife blades to heat soften the stock strip along narrow longitudinal lines to define localized fold lines for the stock strip. The strip is fed sequentially through prebending device and a chilled forming die to set the reformed strip at the fold lines. Preferably the knife blades and any strip contact surfaces of the prebending device and the chilled forming die are TEFLON covered to eliminate scratching of the thermoplastic stock strip material during heating, reforming and cooling.

REFERENCES:
patent: 2779388 (1957-01-01), Quoss
patent: 2848751 (1958-08-01), Vernon
patent: 2892217 (1959-06-01), Luboshez
patent: 3913774 (1975-10-01), Vajtay
patent: 3986659 (1976-10-01), Vajtay
patent: 4064206 (1977-12-01), Seufert
patent: 4329307 (1982-05-01), Westcott et al.
patent: 4485059 (1984-11-01), Krutchen et al.
patent: 4530729 (1985-07-01), Fuchs et al.
patent: 4601689 (1986-07-01), Finkle et al.
patent: 4649008 (1987-03-01), Johnstone et al.

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