Transfer molding apparatus with a cull-block having protrusion

Details Transfer molding apparatus with a cull-block having protrusion Transfer molding apparatus with a cull-block having protrusion

1998-09-24

2000-08-22

Davis, Robert

Plastic article or earthenware shaping or treating: apparatus

Distinct means to feed, support or manipulate preform stock...

Opposed registering coacting female molds

26427217, 4251291, 425544, B29C 4502

Patent

active

061062596

ABSTRACT:
A transfer molding apparatus with a specially designed cull-block can prevent the occurrence of defective molding caused by the air trapped inside the mold body. This cull-block has a cylindrical protrusion at the center of the cull-block and a circular sunken part along the perimeter of the protrusion. This new design prevents the air remaining behind the front of the fluid molding compound during molding process and finally, promotes the production of semiconductor device package free from molding defects.

REFERENCES:
patent: 4708613 (1987-11-01), Sera et al.
patent: 5123826 (1992-06-01), Baird
patent: 5204122 (1993-04-01), Konishi
patent: 5650177 (1997-07-01), Kojima et al.

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