Method of making a rotationally molded container rim
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United States of America Patent
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-
Jul 13, 1999
Issued Date -
N/A
app pub date -
Jun 25, 1997
filing date -
Dec 5, 1995
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A rotationally molded container rim and method for fabrication thereof. The inventive method includes rotationally molding a container while at the same time integrally molding a circumferential rim having an enclosed interior void. Molten plastic and unmelted particles flow from a primary portion of the mold through a gap of uniform width into a secondary mold portion to form the rim. During molding, air is vented from the enclosed void to ambient air outside the mold through a vent opening. The vent opening preferably includes a hollow tube. The rotationally molded container rim that is formed according to the inventive method preferably includes walls that form an enclosed polygonal section. The walls enclose the interior void and at least one vent opening leads from the interior of the rim to the outside of the container.
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