Assembly of injection molding manifold, nozzles and mold

  • US 5,227,179 A
  • Filed: 07/16/1991
  • Issued: 07/13/1993
  • Est. Priority Date: 07/11/1988
  • Status: Expired due to Fees
First Claim
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1. Injection molding apparatus including a mold having multiple cavities and multiple nozzles for injecting fluid resin into said cavities and a manifold having an inlet port and a metal duct structure providing passages for fluid resin from the inlet port to the nozzles, said duct structure having mutually opposite first and second surfaces,said duct structure including at least a first channel in said first surface of the duct structure, said first channel having opposite-side surfaces and a bottom and having greatly elongated undercuts in said opposite-side surfaces thereof, said undercuts being recessed from said first surface of the duct structure,said duct structure further including:

  • a first greatly elongated electric heating member in said first channel, anda first preformed greatly elongated heater cover disposed in said first channel and covering at least part of the length of said elongated electric heating member,said first heater cover and the bottom of said first channel having respective surfaces that conform to opposite sides of said first heating member,said first heater cover having elongated portions projecting into and extending along said undercuts, said projecting portions being positioned for snugly confining said first heating member between all of the length of said first heater cover and the bottom of said first channel so as to constitute a mechanical assembly which provides excellent heat transfer from said first elongated heating member to said duct structure, said first heater cover being of a metal adapted to flow into said undercuts in response to an applied flow-inducing force, said portions of said first heater cover that project into said undercuts being developed by flow-inducing force applied to said preformed heater cover that initially lacks said projecting portions, said flow-inducing force causing the heater cover to bear against said first elongated heating member which consequently bears against the bottom of said first channel.

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