Method of making a rotationally molded container rim

Details Method of making a rotationally molded container rim Method of making a rotationally molded container rim

1997-06-25

1999-07-13

Aftergut, Karen

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

B29C 4106

Patent

active

059222670

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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