Method of molding plastic workpieces about slender permanent ins

Details Method of molding plastic workpieces about slender permanent ins Method of molding plastic workpieces about slender permanent ins

1982-02-25

1984-05-15

Hoag, Willard E.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

To produce composite, plural part or multilayered article

264254, 264275, B29D 300, B29D 1202, B29C 602

Patent

active

044487410

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.

REFERENCES:
patent: 2604661 (1952-07-01), Karns
patent: 3381736 (1968-05-01), Ford et al.
patent: 4201209 (1980-05-01), Leveen et al.
patent: 4348348 (1982-09-01), Bennett et al.

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