Plastic article or earthenware shaping or treating: apparatus – Distinct means to feed – support or manipulate preform stock... – Opposed registering coacting female molds
Patent
1995-07-07
1997-07-22
Nguyen, Khanh P.
Plastic article or earthenware shaping or treating: apparatus
Distinct means to feed, support or manipulate preform stock...
Opposed registering coacting female molds
425121, 425183, 425190, 425544, 425588, 425DIG228, 20427217, 2491141, 249115, 249135, B29C 4502, B29C 4514, B29C 4526
Patent
active
056501773
ABSTRACT:
A gate portion constituting a gate of a resin molding die is made of a hard alloy having a hardness greater than the predetermined hardness in the iron-based hard alloy used to form a cavity block and a center block. Opposing surfaces of the cavity block halves include a polytetrafluoroethylene layer at least at the portions thereof which contact portions of the lead frame in a semiconductor encapsulation molding apparatus.
REFERENCES:
patent: 4779835 (1988-10-01), Fukushima et al.
patent: 4872825 (1989-10-01), Ross
patent: 5061164 (1991-10-01), Sabado et al.
patent: 5252051 (1993-10-01), Miyamoto et al.
patent: 5336272 (1994-08-01), Tsutsumi et al.
patent: 5468141 (1995-11-01), Iwami et al.
Fukasawa Hiroyuki
Hayashi Tsuneyuki
Kojima Akira
Saito Takashi
Nguyen Khanh P.
Sony Corporation
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