Manufacture of plastics material articles

Details Manufacture of plastics material articles Manufacture of plastics material articles

1979-01-30

1980-04-01

Hoag, W. E.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

264544, 264553, 264554, 264555, 264292, 264280, 2642902, B29C 1703, B29D 724, B29F 500

Patent

active

041961641

ABSTRACT:
This invention pertains to a method for thermoforming thin-walled plastics articles from an elongated polyolefin web which is manufactured so as to have minimum orientation so that it will expand lengthwise and widthwise when passed through a heating zone prior to thermoforming, which method comprises moving the web both laterally and longitudinally in a co-ordinated manner whereby the normal inclination of the web to sag because of the longitudinal and lateral expansion of the web due to heating is effectively eliminated.

REFERENCES:
patent: 2490781 (1949-12-01), Cloud
patent: 2728941 (1956-01-01), Alles et al.
patent: 2851733 (1958-09-01), Pangonis et al.
patent: 3014234 (1961-12-01), Koppehele
patent: 3046599 (1962-07-01), Nicholas et al.
patent: 3055048 (1962-09-01), Koppehele
patent: 3217073 (1965-11-01), Olson et al.
patent: 3231561 (1967-05-01), Brown
patent: 3238565 (1966-03-01), Jacobs

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