Method of forming and removing thin walled plastic articles from

Details Method of forming and removing thin walled plastic articles from Method of forming and removing thin walled plastic articles from

1997-11-18

1999-08-10

Heitbrink, Jill L.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Starting material is nonhollow planar finite length preform...

264335, 4254031, 425437, 425444, B29C 5110

Patent

active

059355115

ABSTRACT:
A method of forming and removing thin walled plastic articles from a plurality of dies in a thermoforming apparatus is described. In the method, a plurality of articles are formed and trimmed in a plurality of dies of a thermoforming apparatus. The apparatus includes a flat movable extractor plate. After the articles are formed they are removed from the apparatus by opening the dies sufficient to permit entrance of the flat movable extractor plate between the dies. The extractor plate has a non-porous top plate and a bottom plate having a plurality of spaced holes. A suction chamber is formed by the top and bottom plates with that suction chamber connected to the outlet end of a vacuum source and the inlet end of the vacuum is connected to a pressure control valve with a vent valve between the inlet end of the vacuum source and the pressure control valve. The extractor plate is moved between the plurality of dies, a vacuum is applied from the vacuum source to the suction chamber controlled by the pressure control valve and vent valve to provide suction sufficient to hold the articles formed in the plurality of dies to the extractor plate without deformation of the articles. The extractor plate is withdrawn from between the dies, carrying the articles formed in the plurality of dies. The suction is released and air pressure is applied to the suction chamber for rapid release of the formed articles.

REFERENCES:
patent: 3161915 (1964-12-01), Thiel
patent: 4477243 (1984-10-01), Wallsten
patent: 4560339 (1985-12-01), Padovani
patent: 4872826 (1989-10-01), Padovani

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