Method of molding plastic workpieces about slender permanent inserts
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United States of America Patent
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May 15, 1984
Issued Date -
N/A
app pub date -
Feb 25, 1982
filing date -
Dec 7, 1981
priority date (Note) -
Expired
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Abstract
In injection-molding a plastic workpiece about a prefabricated permanent insert, a first quantity of plastic material is injected into one or more first-shot cavities through which a portion of the insert extends, thereby forming a corresponding number of annular spacers around that portion. After the spacer or spacers have solidified, the spacer-carrying insert is transferred to a second-shot cavity in which each spacer holds the insert separated from the walls of adjoining cavity sections. A second quantity of plastic material is then injected into the second-shot cavity to complete the workpiece by forming a sheath around the insert incorporating the spacer or spacers which are steadying same against lateral movement due to the pressure of the injected second-shot plastic.
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