Two-step injection molding

Details Two-step injection molding Two-step injection molding

1975-01-20

1976-12-07

Kucia, Richard R.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Plural sequential shaping or molding steps on same workpiece

264328, 264335, B29F 114

Patent

active

039963292

ABSTRACT:
A method for injection molding plastic articles which have a relatively thin wall portion is disclosed. A primary core is inserted into a cavity to form the basic mold, and molten plastic is injected into the mold. A secondary core is projected partially into the mold at the section of the mold adapted to form the thin wall portion of the article before the plastic is fully cured to thin the plastic at that section. The plastic is then allowed to fully cure to form the article, and it is removed from the mold.

REFERENCES:
patent: 2706308 (1955-04-01), Lorenz
patent: 3183292 (1965-05-01), Dvoracek
patent: 3196485 (1965-07-01), Battenfeld
patent: 3492387 (1970-01-01), Larson
patent: 3737272 (1973-06-01), Segmuller
patent: 3773888 (1973-11-01), Ruekberg
patent: 3825637 (1974-07-01), Robin

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