Method for production of hollow articles from injection molded p

Details Method for production of hollow articles from injection molded p Method for production of hollow articles from injection molded p

1975-09-23

1977-05-24

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264235, 264346, 264DIG64, 264DIG65, 432122, B29C 1707, B29C 2500

Patent

active

040255948

ABSTRACT:
Hollow articles such as bottles and containers are formed from tubular, elongated injection molded preforms made of thermoplastic material and having a finished neck portion adjacent an open end and a closed end body portion which method comprises annealing said preform by heating the portion of the preform body adjacent the neck to a temperature just below or about the Tg (glass transition temperature) for such material while maintaining the remainder of the preform body at a significantly lower temperature, for a sufficient time to essentially relieve the internal stresses in said body portion adjacent the neck, such annealing step being applied prior to the thermoforming of said preform into the hollow article.

REFERENCES:
patent: 2373093 (1945-04-01), Baker
patent: 2896264 (1959-07-01), Natta et al.
patent: 3294883 (1966-12-01), Polka
patent: 3477700 (1969-11-01), Kinslow, Jr.
patent: 3531452 (1970-09-01), Griffith et al.
patent: 3555135 (1971-01-01), Paul
patent: 3830893 (1974-08-01), Steingiser
patent: 3862288 (1975-01-01), Cheh-Jen Su
patent: 3865912 (1975-02-01), Rosenkranz et al.
patent: 3894835 (1975-07-01), Berggren et al.
Injection Molding Theory and Practice, I. Rubin, pp. 264-267, 1973, Wiley & Sons, N.Y., N.Y.

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