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US 5,240,402 AGranted
Apparatus for preparing hollow plastic article
AssigneeHusky Injection Molding Systems Ltd.
InventorRonald W. Ingram
Life of this patent
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Abstract
Apparatus includes a blow mold for forming a hollow plastic article forming a parison including at least reciprocable mold portions affixed to platens, wherein the mold portions are relatively movable from an open to a closed position including a spacing bar contacting the platens in the mold closed position operative to space apart the mold portions in the closed position thereof to form a controlled vent therebetween.
Claims10
An apparatus for preparing a hollow plastic article which comprises:
- a blow mold for forming a hollow plastic article from a parison including at least two relatively reciprocable mold portions affixed to platens, wherein said mold portions form a mold cavity therebetween having a shape of a desired hollow plastic article;
- means for holding the parison within the blow mold;
- means for relatively moving said mold portions from a first open position to a second closed position wherein the mold portions form the mold cavity therebetween having the shape of the desired hollow plastic article;
- spacing means contacting said platens in the mold closed position operative to space apart said mold portions in the closed position thereof to form a controlled vent therebetween;
- and means for introducing high pressure fluid into the parison to expand same into conformity with the mold cavity;
- whereby air trapped in the mold cavity is released via said controlled vent.
3 more elements
Dependencies are inferred from the claim text.