Manufacture of thin walled plastics material articles

Details Manufacture of thin walled plastics material articles Manufacture of thin walled plastics material articles

1977-12-27

1980-04-01

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

264544, 264DIG65, 425384, B29C 1704

Patent

active

041961587

ABSTRACT:
A plastics material web produced by extrusion or calendering and having a small thermoforming temperature range is located in two stages; a first stage in which radiant heaters heat the web approximately to thermoforming temperature and a second stage in which the temperature variations in the web due to thickness variations and heating variations are compensated by passing the web round rollers heated to the thermoforming temperature. The heated web is passed step by step to a thermoforming machine which operates cyclically on the web to form articles therein.

REFERENCES:
patent: 2888787 (1959-06-01), Cloud
patent: 2905969 (1959-09-01), Gilbert et al.
patent: 2929153 (1960-03-01), Fry, Jr. et al.
patent: 2999675 (1961-09-01), Erhardt, Jr. et al.
patent: 3084389 (1963-04-01), Doyle
patent: 3235639 (1966-02-01), Knowles
patent: 3318017 (1967-05-01), Smith, Jr.
patent: 3554504 (1971-01-01), Parkes
patent: 3667889 (1972-06-01), Martelli

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