Apparatus and method for forming a plastic sheet

Details Apparatus and method for forming a plastic sheet Apparatus and method for forming a plastic sheet

1989-06-16

1991-03-12

Chiesa, Richard L.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Production of continuous or running length

26421112, 264556, 264571, 425362, 425363, 425388, B29C 3914

Patent

active

049991523

ABSTRACT:
A method and apparatus for forming a continuous extrudate of a heated soft thermoplastic material into a continuous sheet of a cooled rigid thermoplastic material having a plurality of recesses formed in one surface thereof and a plurality of projections formed on the other surface thereof by feeding successive portions of a heated soft extruded thermoplastic material onto successive portions of a forming cylinder having a generally cylindrical outer peripheral surface having a plurality of recesses formed therein and applying a vacuum through the recesses to draw areas of successive portions opposite to the recesses into conformation with the recesses and cooling the thermoplastic material by moving a cooling fluid over the inner peripheral surface of the forming cylinder and removing the successive portions to form a continuous sheet of a rigid thermoplastic material having a plurality of recesses formed in one surface thereof and a plurality of projections formed on the other surface thereof.

REFERENCES:
patent: 3205837 (1965-09-01), Fay
patent: 3208898 (1965-09-01), Chavannes et al.
patent: 3314110 (1967-04-01), Missbach
patent: 3346438 (1967-10-01), Chavannes
patent: 3416984 (1968-12-01), Chavannes et al.
patent: 3655486 (1972-04-01), Hagino et al.
patent: 3756884 (1973-09-01), Hagino
patent: 3837973 (1974-09-01), Asakura et al.
patent: 3954368 (1976-05-01), Kawakami
patent: 3999928 (1976-12-01), Asakura et al.

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