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Flash Free Compression Molding Process

IP.com Disclosure Number: IPCOM000073357D
Original Publication Date: 1970-Dec-01
Included in the Prior Art Database: 2005-Feb-22
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Zykoff, FB: AUTHOR

Abstract

In compression molding of parts having a hole therethrough, the flash in the holes must be removed by a secondary bench operation. The present process of compression molding eliminates the flash in the cored holes and also provides a hole of more uniform dimensions.

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Flash Free Compression Molding Process

In compression molding of parts having a hole therethrough, the flash in the holes must be removed by a secondary bench operation. The present process of compression molding eliminates the flash in the cored holes and also provides a hole of more uniform dimensions.

A core pin 10 is provided which is forced in the upward direction by a spring
12. The core pin 10 extends above the bulk factor of the molding compound 14. As the top mold 16 closes, it contacts the top of core pin 10. Further closing causes the core pin spring 12 to be compressed as well as the plastic compound
14. It will be appreciated that the molding compound 14 cannot flash over the core hole since the core pin 10 contacts the top part of the mold 16 before the compression takes place.

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