Contoured assist plug for thermoforming oriented articles

Details Contoured assist plug for thermoforming oriented articles Contoured assist plug for thermoforming oriented articles

1976-04-19

1977-08-02

Lazarus, Richard B.

Plastic article or earthenware shaping or treating: apparatus

Female mold and means to shape parison directly by internal...

Including means to prepare parison

425412, 425397, 425398, 425469, B29C 1704

Patent

active

040392716

ABSTRACT:
Oriented articles such as jars and the like having wall sections of exceptional uniformity are thermoformed from sheet by heating the sheet to orientation temperature and stretching it with a plug assist which has a concave surface with a flat face around the periphery thereof terminating in a radius of 1/64 to 1/4-inch. This configuration allows a controlled amount of slippage to occur as the plug advances to stretch the sheet.

REFERENCES:
patent: 2990581 (1961-07-01), Rowe, Jr.
patent: 3167104 (1965-01-01), Wiley et al.
patent: 3173174 (1965-03-01), Edwards
patent: 3291874 (1966-12-01), Negoro
patent: 3338997 (1967-08-01), Tigner
patent: 3342914 (1967-09-01), Edwards
patent: 3433862 (1969-03-01), Weber
patent: 3461503 (1969-08-01), Dockery
patent: 3470281 (1969-09-01), Knowles
patent: 3499188 (1970-03-01), Johnson

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