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T-shaped film extrusion die

  • US 5,395,231 A
  • Filed: 11/12/1993
  • Issued: 03/07/1995
  • Est. Priority Date: 08/06/1993
  • Status: Expired due to Fees
First Claim
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1. A T-shaped film extrusion die for use in extrusion forming a film of a synthetic resin, comprising (1) a manifold for distributing a molten synthetic resin introduced into said die, in the lengthwise direction of said die, said manifold extending in the lengthwise direction of said die and having two sides, two ends and two end portions in the vicinity of said ends, (2) a slot land through which said molten resin is passed from said manifold to lips having a discharge orifice therebetween, said slot land extending in the lengthwise direction of said die and having two sides, two ends and two end portions in the vicinity of said ends, (3) said lips for controlling the thickness of a film to be obtained by regulating the width of said discharge orifice, (4) inner deckles provided in both said end portions of said manifold and land, said inner deckles being movable in the lengthwise direction of said die and adapted to restrict the width of a flow of said molten resin, (5) inner deckle rods provided in both said end portions of said slot land and located in the vicinity of said discharge orifice, movable in conjunction with said inner deckles and in parallel therewith, and used to control the width of the film to be obtained, and (6) heat pipes each having an outer side surface provided on both said sides of said manifold so as to extend in parallel with each other in the lengthwise direction of said T-shaped die, and at least a part of the outer side surface of each of said heat pipes is exposed to the interior of said manifold over the entire length of said manifold.

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