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Method and apparatus for manufacturing magnet wire

  • US 4,826,706 A
  • Filed: 04/21/1988
  • Issued: 05/02/1989
  • Est. Priority Date: 04/29/1981
  • Status: Expired due to Fees
First Claim
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1. A method of manufacturing magnet wire in which a flowable but hardenable material is applied to an elongated conductor to a desired thickness in a single pass whereby a conductor may be drawn, or otherwise formed, coated and spooled in a continuous operation comprising the steps of:

  • a. passing said conductor through a stationary entrance die at a speed in excess of 100 feet per minute, said entrance die being small enough to prevent leakage of said material from said die chamber while said conductor is passing therethrough and large enough to allow said leakage when said conductor is stationary in said entrance die,b. passing said conductor through a stationary exit die at a speed in excess of 100 feet per minute, said exit die having a throat portion, an entrance opening larger than said throat portion interconnected by a converging interior wall thereby defining a die cavity between said throat portion and said opening and said conductor and said wall, said entrance die and exit die defining and partially enclosing a die chamber therebetween, said conductor being spaced from said dies, said exit and entrance dies being spaced apart by said die chamber, said entrance die diameter being larger than said exit die diameter,c. filling said die chamber with a flowable material including less than about 5% by weight of solvent at a temperature above the melting point thereof,d. raising the pressure of said material within said die chamber above atmospheric pressure,e. passing said conductor through said die chamber thereby applying said flowable material onto said conductor,

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