Two-step injection molding

Details Two-step injection molding Two-step injection molding

1976-07-07

1977-11-22

Lazarus, Richard B.

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

Mold having movable core or movable pin

425414, 425437, B29F 106

Patent

active

040593843

ABSTRACT:
A method and apparatus 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: 3470284 (1969-09-01), Hartmann
patent: 3671159 (1972-06-01), Greenberg et al.
patent: 3737272 (1973-06-01), Segmuller
patent: 3767742 (1973-10-01), Robin
patent: 3825637 (1974-07-01), Robin

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