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Injection mold and partial compression molding method

  • US 7,722,792 B2
  • Filed: 01/30/2008
  • Issued: 05/25/2010
  • Est. Priority Date: 02/05/2007
  • Status: Expired due to Fees
First Claim
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1. An injection mold comprising:

  • a stationary mold section;

    a movable mold section disposed opposite to the stationary mold section, with a cavity formed between the movable mold section and the stationary mold section;

    a compression pin extending through the movable mold section and having a front end face that forms a part of a cavity surface;

    a biasing member providing a biasing force against the compression pin, wherein the front end face of the compression pin can retreat from the cavity by pressure of resin filling the cavity and forming a compression boss; and

    a driving unit configured to advance the retreating front end face of the compression pin toward the cavity to compress the formed compression boss before cavity opening, with the driving unit independent from the biasing member.

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