Process for forming flexible fold lines in thermoplastic sheets

Details Process for forming flexible fold lines in thermoplastic sheets Process for forming flexible fold lines in thermoplastic sheets

1976-01-28

1977-12-20

Kucia, Richard R.

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

264 22, 264 25, 264295, 264322, B29C 1500

Patent

active

040642062

ABSTRACT:
An edge forming tool is pressed into a thermoplastic sheet which is supported on an anvil or counter tool. The edge forming tool is maintained at a temperature below the melting temperature of the thermoplastic sheet and a high frequency electric field is established between the edge forming tool and the counter tool. The high frequency electric field softens the thermoplastic sheet which is deformed by the edge forming tool, Thereafter, the softened and deformed portions of the thermoplastic sheet are allowed to cool and re-harden before the sheet is folded to form a bend therein.

REFERENCES:
patent: 3379814 (1968-04-01), Bracey
patent: 3454694 (1969-07-01), Delaire
patent: 3900550 (1975-08-01), Oliver
patent: 3953056 (1976-04-01), Roberts

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