Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – To produce composite – plural part or multilayered article
Patent
1975-09-24
1977-03-15
Kucia, Richard R.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
To produce composite, plural part or multilayered article
264294, 264325, 264328, 273 82R, B29C 106, B29F 1022
Patent
active
040123863
ABSTRACT:
A method of making a bowling pin is disclosed, incorporating both injection molding and compression molding. The pin is formed in a split cavity, into which a core pin is extendable. The disclosed method includes the steps of first injecting a quantity of high density plastic material through a gate in such fashion as to cause it to strike a specially formed, concave distal end of a core pin while the core pin is slightly retracted. The molding operation is "programmed" in such fashion as to further insert the core pin following injection of a predetermined quantity of the plastic material, whereby the core pin compresses the previously injected material. A special form of the core pin assures the distribution and compression of the injected material in such fashion as to apply, in every area of the molding cavity taken longitudinally thereof, a compressive force selected in relation to the bowling pin body wall thickness and diameter occurring in that area, thus to control voids, sink marks, and warpage in the finished product.
REFERENCES:
patent: 2964319 (1960-12-01), Berry
patent: 3052925 (1962-09-01), Bronnenkant
patent: 3159701 (1964-12-01), Herter
patent: 3511845 (1970-05-01), Scalora
patent: 3632729 (1972-01-01), Bielfeldt
Kucia Richard R.
Stokes-Trenton, Inc.
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