Injection molding die for injection-molding base boards

Details Injection molding die for injection-molding base boards Injection molding die for injection-molding base boards

1993-09-30

1995-12-05

Mackey, James P.

Plastic article or earthenware shaping or treating: apparatus

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

With preform severing means movable relative to mold

264163, 2643287, 425553, 425590, 425810, B29C 4538

Patent

active

054723345

ABSTRACT:
To produce base boards each usable for an information recording medium such as a photoelectromagnetic disc or the like by employing an injection molding process, an injection molding die of the type comprising a die half on the stationary side and a die half on the movable side includes a cylindrical supporting member on the stationary side, a die assembly on the stationary side arranged in the cylindrical supporting member, a cylindrical supporting member on the movable side, a die assembly on the movable side arranged in the cylindrical supporting member, a cylindrical guide member located between both the cylindrical members, a first driving unit for displacing the die half on the movable side, and a second driving unit for actuating an ejector sleeve. Each injection-molding operation is achieved by way of the steps of filling a cylindrical die cavity with a pressurized molten resin, forming a center hole through a molded product of base board, holding the die cavity in the fully closed state, and then re-compressing the molded produce of base board by actuating the first driving unit. While the step of re-compressing is executed, the molded product of base board is squeezed against the die cavity and the outer peripheral surface of a cut sleeve by a high inner pressure of the molten resin with the result that a final molded product of base board has a high density and exhibits a smooth surface on the center hole formed through the molded product of base board.

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Installation and Fabrication Manual, Dow Chemical Company, pp. 20-24. No Date.
PCT Publication No. WO 89/0821. Sep. 1989.

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