Process and apparatus for vacuum forming

Details Process and apparatus for vacuum forming Process and apparatus for vacuum forming

1990-12-10

1992-07-07

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Producing multilayer work or article

264257, 264571, 425504, 425112, 425388, B29C 6712, B29C 5110

Patent

active

051280906

ABSTRACT:
A vacuum forming process, and an apparatus for carrying out the same, for imparting a predetermined shape to a sheet material. The process includes the steps of placing a thermally softened sheet material onto a molding surface of a mold and evacuating air remaining between the molding surface of the mold and the sheet material, thereby bringing the sheet material into a close contact with the molding surface of the surface of the mold. The vacuum forming process and apparatus is adapted for giving a predetermined shape to a sheet material having a low elongation ratio. In particular, when giving a predetermined shape to the sheet material, part of the sheet material is pressed with a pressing member against the molding surface of the mold, a peripheral portion of the sheet material is held with a holding member, and holding forces exerted by a plurality of holding portions of the holding member are varied in order to control movement amounts of the sheet material resulting from a pressing force of the pressing member. In this manner, a predetermined shape can be given to a sheet material without causing wrinkles thereto, even when the sheet material has a low elongation ratio.

REFERENCES:
patent: 4116736 (1978-09-01), Sanson et al.
patent: 4276346 (1981-06-01), Bramwell
patent: 4327052 (1982-04-01), Sauer
patent: 4381278 (1983-04-01), Ingraffea
patent: 4801347 (1989-01-01), Garwood

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