Transfer molding apparatus with a cull-block having protrusion
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United States of America Patent
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Aug 22, 2000
Grant Date -
N/A
app pub date -
Sep 24, 1998
filing date -
Dec 16, 1997
priority date (Note) -
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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.
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