Injection-molding dimension-control and clamp-reduction

Details Injection-molding dimension-control and clamp-reduction Injection-molding dimension-control and clamp-reduction

1989-06-05

1991-04-16

Heitbrink, Jill L.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

2643289, 26432812, 26432816, B29C 4516, B29C 4537

Patent

active

050080644

ABSTRACT:
The dimensions of an injected molded hollow plastic product are controlled and the separative force exerted against mold sections during molding of the product are reduced by injecting plastic material continuously from a gate into a mold cavity having flow channels extending through the cavity region until the mold cavity is filled with said injected plastic material, with said injection being under such conditions of injection pressure, injected plastic material temperature, mold cavity temperature, flow channel length, distance between flow channels, flow channel thickness and wall thickness in a thin-cavity region between flow channels that initially injected plastic material solidifies in the thin-cavity regions to thereby stabilize one mold section in relation to the other mold section prior to the mold cavity being filled with the injected plastic material, and to thereby reduce said separative force.

REFERENCES:
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patent: 4807775 (1989-02-01), Sorensen

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