Method for the removal of a mold core from an injection molded p

Details Method for the removal of a mold core from an injection molded p Method for the removal of a mold core from an injection molded p

1974-07-11

1976-10-19

White, Robert F.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

264336, 425DIG58, B29C 114, B29C 700, B29C 1100

Patent

active

039871444

ABSTRACT:
In the injection molding of undercut and continuously slotted duct sections from a plastic material where a multi-part mold structure including a core is used, the core of the mold structure is removed, after the injection molding operation, by cooling the plastic material used to a temperature below its softening temperature, releasing the bearing contact of the mold supporting the lateral exterior of the duct section and the exterior base of the duct section, providing a bearing contact with the surface of the duct section upwardly from its base with the bearing contact affording a force restraining the duct section from movement in the direction outwardly from the slotted opening of the duct, and pulling the core outwardly through the continuous slot while the bearing contact with the duct section holds it against displacement due to the pulling action.

REFERENCES:
patent: 1989724 (1935-02-01), Villanyi
patent: 3020594 (1962-02-01), Makowski
patent: 3325576 (1967-06-01), Kessler

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