Apparatus for vacuum thermoforming polymeric sheet material

Details Apparatus for vacuum thermoforming polymeric sheet material Apparatus for vacuum thermoforming polymeric sheet material

1980-07-14

1981-08-18

Flint, Jr., J. Howard

Plastic article or earthenware shaping or treating: apparatus

Plural reshaping means or plural vulcanizing means including...

Including means for contacting work by fluid pressure

425343, 425388, 425397, 425DIG48, B29C 1704

Patent

active

042843960

ABSTRACT:
Apparatus for vacuum molding a plurality of three dimensional geometrical shapes in a thermoplastic polymeric sheet having a molding plate, the surface of which has a plurality of three dimensional geometrical shapes, with said molding plate having an enclosing border, a molding face and a non-molding face; a gas orifice extending through the molding plate so that a gas can flow from one face of the molding plate to the other face; a mechanism to move the molding plate along a predetermined path; a mechanism to maintain a thermoplastic polymeric sheet, heated to a plastic condition, adjoining the moving molding plate molding face; a mechanism to releasably seal the heated polymeric sheet to and all around the molding plate border; a vacuum source to remove gas, from between the heated polymeric sheet and the molding face of the molding plate, through the gas orifice whereby exterior pressure can force the heated sheet against the molding face surface; and a mechanism for removing the molded sheet, after it cools to a non-plastic condition, from contact with the moving molding plate face.

REFERENCES:
patent: 2761490 (1956-09-01), Walton
patent: 2776451 (1957-01-01), Chavannes
patent: 2902718 (1959-09-01), Martelli et al.
patent: 2935828 (1960-05-01), Mabaffy et al.
patent: 3181202 (1965-05-01), Martelli
patent: 3265265 (1966-08-01), Levi
patent: 3314110 (1967-04-01), Mirsbach
patent: 3562859 (1971-02-01), McIntyre
patent: 3632252 (1972-01-01), Amberg et al.
patent: 3954368 (1976-05-01), Kawakami

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