Method of forming reducing formation of impressions from the for

Details Method of forming reducing formation of impressions from the for Method of forming reducing formation of impressions from the for

1989-03-02

1990-08-14

Heitbrink, Jill L.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Differential temperature conditioning

264548, 264336, B29C 5142

Patent

active

049485482

ABSTRACT:
In forming operations on plastic sheets, plates, strips, or tubes (particularly, having highly glossy surfaces) by molding or forming tools, the surface qualities, particularly the gloss, remains undamaged if; (a) the tool is maintained at a temperature in the thermoelastic state region of the plastic until disengagement of the plastic from the tool; and (b) the formed plastic is cooled at its rear side to below the softening temperature, and is disengaged from the forming tool while said tool is hot.

REFERENCES:
patent: 4584157 (1986-04-01), Sweig
patent: 4704081 (1987-11-01), Puehler

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