Plastic container, preform for and method of making same

Details Plastic container, preform for and method of making same Plastic container, preform for and method of making same

1988-09-16

1989-12-26

Weaver, Sue A.

Bottles and jars

Ejecting

Siphon type

215 31, 428 357, 4285428, 264 25, 264235, 264346, 264521, 264532, 264535, B65D 102, B65D 2300, B29C 4908, B29C 4964

Patent

active

048892475

ABSTRACT:
In the blow molding of a container from a preform in a heated blow mold wherein the container has formed as part of the preform a neck portion which remains unoriented, there is a tendency for the neck portion to distort relative to the body so that there is a perpendicularity problem. In accordance with this invention, the problem has been solved by either crystallizing that portion of the preform which remains unoriented in the blow molding of the container so as to both provide a clear line of demarcation between the unoriented and biaxially oriented portion of the container and to increase the glass temperature of the preform portion so as to prevent shrinkage due to conductive heating. In accordance with another form of the invention, that portion of the preform immediately below the neck portion is provided with an exterior weakening ring or notch which also provides a clear line of demarcation between the oriented and unoriented portion of the container so as to eliminate differential radial shrinkage and existing perpendicularity problems.

REFERENCES:
patent: 4179488 (1979-12-01), Nishikawa et al.
patent: 4379099 (1983-04-01), Ota et al.
patent: 4431398 (1984-02-01), Aoki
patent: 4572811 (1986-02-01), Ota et al.
patent: 4589559 (1986-05-01), Hayashi et al.
patent: 4590021 (1986-05-01), Ota et al.

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