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Method and apparatus for insulating electrical conductor

  • US 4,708,837 A
  • Filed: 04/09/1986
  • Issued: 11/24/1987
  • Est. Priority Date: 04/09/1986
  • Status: Expired due to Fees
First Claim
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1. Apparatus for insulating an electrical conductor wire comprising an extruder cross-head having an extrusion die defining a die orifice, internal wall means defining a flow passage for directing molten polymeric dielectric material to the die orifice, a core tube within the cross-head and upstream from the die orifice, the core tube defining a guide passage for directing the conductor wire through the die orifice as it moves along a passline, mounting means for the core tube to render it adjustable into any desired position along the passline, drive means operably connected to the core tube to controllably adjust the distance between the core tube and the wall means and thereby adjust the cross-sectional area of the flow passage, a monitoring means downstream from the cross-head for monitoring a parameter indicative of the thickness of the conductor wire when covered with the insulation layer, and an analyzing and control means to analyze monitored values received from the monitoring means and for controlling the position of the core tube along the passline, said means operable upon a monitored value differing from that required for a desired thickness of conductor wire to actuate the driving means and move the core tube in the appropriate direction to change the conductor wire thickness towards that desired.

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