Process of making dimensionally stable polyester yarn for high tenacity treated cords

  • US 5,630,976 A
  • Filed: 09/12/1995
  • Issued: 05/20/1997
  • Est. Priority Date: 07/05/1988
  • Status: Expired due to Fees
First Claim
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1. A process for production of a drawn polyethylene terephthalate yarn which translates to a high tenacity dimensionally stable tire cord, comprising:

  • (A) extruding a molten melt-spinnable polyethylene terephthalate having an intrinsic viscosity of 0.8 or greater through a shaped extrusion orifice having a plurality of openings to form a molten spun yarn,(B) solidifying the spun yarn gradually by passing the yarn through a solidification zone which comprises (a) a retarded cooling zone and (b) a cooling zone adjacent said retarded cooling zone wherein said yarn is rapidly cooled and solidified in a blown air atmosphere,(C) withdrawing the solidified yarn at sufficient speed to form a crystalline, partially oriented yarn with a crystallinity of 3 to 13% and a melting point elevation of 2°

    to 10°

    C., and(D) hot drawing the yarn to a total draw ratio between 1.5/1 and 2.5/1.

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