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
Patent
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
Holland Charles M.
Parrack Lawrence W.
Kucia Richard R.
Misto & Gen Equipment Co.
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