Method of manufacturing a container with improved wall uniformit

Details Method of manufacturing a container with improved wall uniformit Method of manufacturing a container with improved wall uniformit

1996-08-29

1998-08-11

Timm, Catherine

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Differential temperature conditioning

264536, 264540, 425525, 425532, B29C 4904

Patent

active

057924147

ABSTRACT:
A method of manufacturing a container, wherein less material is required to produce the container, the container has a more uniform wall thickness, and malformations around the neck of the container are significantly reduced. The method includes forming plastic into a parison and blowing it into a mold having a tapered neck portion and a body portion, which join to form an annular corner for contacting the parison. A blow pin blows air into the mold and parison, causing the parison to expand and conform to the inner contour of the mold. The taper of the neck portion and the annular corner thereby formed, cool the plastic at that point and more uniformly form the parison into the container, the amount of material wasted and required in manufacturing the container is substantially reduced, as is malformations and warping which usually occur about the neck of the finished container.

REFERENCES:
patent: 3410937 (1968-11-01), Winchester, Jr.
patent: 3531556 (1970-09-01), Mehnert
patent: 3949034 (1976-04-01), Uhlig
patent: 4540542 (1985-09-01), Weiler

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