Crosshead apparatus for jacketing wire core

  • US 5,358,570 A
  • Filed: 03/16/1994
  • Issued: 10/25/1994
  • Est. Priority Date: 07/22/1993
  • Status: Expired due to Term
First Claim
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1. Crosshead apparatus for dispensing a tubular section of polymeric plastic composition comprising in combination;

  • a) a generally annular body having an inlet at which to receive a continuous flow of at least partially molten polymer plastic composition of which said section is to be formed, said body having an internal bore extending axially therethrough;

    b) a manifold having a bore and disposed coaxially within the internal bore of said body for at least a partial length of said body;

    c) die means disposed coaxially within the internal bore of said body downstream of said manifold and defining a relatively narrow aperture having an inlet and an outlet in flow communication with the bore of said manifold;

    d) means defining a flow path between said body and said manifold for conducting flow of the plastic composition received at said body inlet to near the inlet of said die means and including a pair of matching primary flow channels, each effecting an intersection with a tri-directional splitter for diverting the flow to oppositely oriented secondary channels and over a ramped diversion dam, a substantially annular distribution path defined between said manifold and said body and at least a partially frusto-conical path downstream from said annular path in flow communication between said annular path and the inlet of said die means for said composition to emerge as a tubular section from the outlet of said die means; and

    e) temperature controlled heating means operable to maintain the plastic composition in said flow path means in a molten state until reaching at least the aperture inlet of said die means.

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