Process and apparatus for the manufacture of objects of crystall

Details Process and apparatus for the manufacture of objects of crystall Process and apparatus for the manufacture of objects of crystall

1981-11-09

1983-10-11

Czaja, Donald E.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

2642101, 264294, 425143, 425325, 425376R, D01D 512

Patent

active

044091737

ABSTRACT:
Crystalline polystyrene is thermoformed by extruding molten material into a temperature controlled roller press having press rollers and draw rollers separated by a support roller. The buildup of sheet between the support and draw roller is controlled. The edges of the sheet are heated and then gripped by a first set of sprockets and a second set positioned past the thermoforming device. The gripped sheet passes through a heating device where both sides of the sheet are heated before the intermittent action of the press. The formed objects are removed and the second sprockets feed the sheet to a grinder

REFERENCES:
patent: 3161915 (1964-12-01), Thiel
patent: 3931383 (1976-01-01), Erlewine et al.
patent: 4083914 (1978-04-01), Schippers et al.
patent: 4086045 (1978-04-01), Thiel et al.
patent: 4105386 (1978-08-01), Thiel et al.
patent: 4118454 (1978-10-01), Miki et al.

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