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Injection/compression molding method, a die for injection/compression molding and an injection/compression molding machine

  • US 5,340,528 A
  • Filed: 02/16/1993
  • Issued: 08/23/1994
  • Est. Priority Date: 02/21/1992
  • Status: Expired due to Term
First Claim
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1. An injection molding die comprising:

  • a fixed half die;

    a movable half die having a core surface for forming a surface of a molding to be formed, said movable half die being joined to the fixed half die to form a cavity in the injection molding die;

    ejector pins axially movably supported on the movable half die; and

    a compressing mechanism which holds some of the ejector pins respectively at positions where the extremities of said some of the ejector pins are retracted from the core surface of the movable half die to form recesses corresponding to compression allowances int he core surface, said compressing mechanism advancing the ejector pins toward the cavity after a molten resin has been injected into the injection molding die and fills the cavity and the recesses,wherein said some of said ejector pins are fixed to a first ejector plate, ad the rest of the ejector pins are fixed to a second ejector plate, and wherein said compressing mechanism controls the first ejector plate to compress the resin in the recesses corresponding to the compression allowances with said some of sad ejector pins and subsequently both ejector plates to advance the ejector pins thereon to eject the molding from said cavity.

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