Process for the manufacture of an oriented container

Details Process for the manufacture of an oriented container Process for the manufacture of an oriented container

1971-11-24

1976-09-07

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

425DIG208, 425DIG209, B29C 1707

Patent

active

039794911

ABSTRACT:
Method for molding plastic articles by forming a parison on a core within an injection mold, cooling the internal and external walls of the parison thus formed by heat transfer through the core and the injection mold, transferring said core to a delay position for permitting redistribution of heat from the interior of the parison to the exposed walls to obtain a more uniform temperature just above the material's glass transition temperature, and subsequently transferring said core to an expansion mold for expanding same, the cooling and heat redistribution permitting a greater degree of orientation of the polymer chains of the formed articles. Preferably, the apparatus for practicing the process includes injection and expansion molds supported in such a relation as to permit a substantial time interval between injection and expansion of the parison.

REFERENCES:
patent: 2331687 (1943-10-01), Hobson
patent: 2331702 (1943-10-01), Kopitke
patent: 3470282 (1969-09-01), Scalora

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