Apparatus for lengthwise folding thermoplastic strip material

Details Apparatus for lengthwise folding thermoplastic strip material Apparatus for lengthwise folding thermoplastic strip material

1988-08-22

1990-01-30

Thurlow, Jeffery

Plastic article or earthenware shaping or treating: apparatus

Preform reshaping or resizing means: or vulcanizing means...

Including both heating and cooling means

219243, 264284, 264285, 264293, 264294, 264295, 264339, 264DIG46, 264DIG66, 425385, 425391, 425394, 425397, 425DIG13, 425DIG55, 425186, B29C 5306, B29C 5902

Patent

active

048970301

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 a 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 PTFE covered to eliminate scratching of the thermoplastic stock strip material during heating, reforming and cooling.

REFERENCES:
patent: 2706239 (1955-04-01), Blaser
patent: 2848751 (1958-08-01), Vernon
patent: 3245772 (1966-04-01), Cypher et al.
patent: 3281516 (1966-10-01), Southwick
patent: 3379814 (1968-04-01), Bracey, Jr.
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patent: 3900550 (1975-08-01), Oliver et al.
patent: 3953056 (1976-04-01), Roberts
patent: 4147488 (1979-04-01), Chiron
patent: 4153665 (1979-05-01), Vecchiotti et al.
patent: 4179252 (1979-12-01), Seufert
patent: 4329307 (1982-05-01), Westcott et al.

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