Process for using a contoured assist plug for thermoforming orie

Details Process for using a contoured assist plug for thermoforming orie Process for using a contoured assist plug for thermoforming orie

1975-01-07

1976-06-29

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 89, 264 92, 264292, 425387R, 425388, B29C 1704

Patent

active

039668606

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 ocur as the plug advances to stretch the sheet.

REFERENCES:
patent: 3167104 (1965-01-01), Wiley et al.
patent: 3291874 (1966-12-01), Negoro
patent: 3461503 (1969-08-01), Dockery
patent: 3470281 (1969-09-01), Knowles
patent: 3499188 (1970-03-01), Johnson

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