Preparation of molecularly oriented containers using reheat proc

Details Preparation of molecularly oriented containers using reheat proc Preparation of molecularly oriented containers using reheat proc

1975-04-09

1977-07-19

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 25, 264 89, 264 98, 264237, 264348, 425526, B29C 1707

Patent

active

040369277

ABSTRACT:
Molecularly oriented containers are formed from molded preforms made of an amorphous thermoplastic resin and having a finished neck tubular portion and a body portion which method includes subjecting the preform body to a thermoforming orienting step while at a temperature at which substantial molecular orientation occurs, said temperature being arrived at by first overheating the outside of said preform body using external heating means to an average outside temperature greater than the substantial molecular orientation temperature range thereby creating a temperature gradient across the thickness of said preform body and then cooling said headed preform body until the average outside temperature is within said,substantial molecular orientation temperature range and the entire preform body is at a temperature within said substantial molecular orientation temperature range and whereas said temperature gradient is significantly reduced.

REFERENCES:
patent: 3445096 (1969-05-01), Seefluth
patent: 3715109 (1973-02-01), Gilbert
patent: 3754851 (1973-08-01), Reilly et al.
patent: 3787170 (1974-01-01), Gilbert
patent: 3830893 (1974-08-01), Steingiser
patent: 3894835 (1975-07-01), Berggren et al.
patent: 3963399 (1976-06-01), Zavasnik
patent: 3995990 (1976-12-01), Dwyer et al.
Derwent Publications, LTD., Belgium Patent No. 791,444 - 3/16/73, No. 29856U.

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