Thermoplastic preform and heated mandrel constructions

Details Thermoplastic preform and heated mandrel constructions Thermoplastic preform and heated mandrel constructions

1975-03-03

1976-06-01

Van Balen, William J.

Stock material or miscellaneous articles

Hollow or container type article

Cellular material derived from plant or animal source

264 92, 264 94, 264DIG66, 425387B, 425388, 425393, 425403, 425DIG203, 428 98, 428167, 428542, B65D 2100

Patent

active

039611132

ABSTRACT:
A preform of generally elongate conical configuration from the open end thereof to the opposite smaller end closed, as by a rounded tip portion, with a smooth interior surface throughout the major portion thereof from the tip portion to an area adjacent the open end; and the telescopic association of the preform with a heated complementally shaped smooth surfaced mandrel; the area of the preform adjacent the open end thereof having internal circumferentially spaced surface portions providing passages therealong for vacuum withdrawal of air to conform the inner surface of the major portion of the preform in intimate thermal contact with the mandrel prior to conformation of the passaged area of the preform with the adjacent surface of the mandrel under heating of the preform to molding temperature and subsequent association of the mandrel and preform in a female mold for re-shaping the preform under applied differential pressure.

REFERENCES:
patent: 3341893 (1967-09-01), Edwards
patent: 3398428 (1968-08-01), Fuerst et al.
patent: 3420924 (1969-01-01), Mason et al.
patent: 3696987 (1972-10-01), Schuff et al.
patent: 3719735 (1973-03-01), Valyi
patent: 3770860 (1973-11-01), Amberg et al.
patent: 3787547 (1974-01-01), Stephan
patent: 3882212 (1975-05-01), Edwards
patent: 3892830 (1975-07-01), Hudson et al.

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