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Apparatus and process for polygonal melt-blowing die assemblies for making high-loft, low-density webs

  • US 5,645,790 A
  • Filed: 02/20/1996
  • Issued: 07/08/1997
  • Est. Priority Date: 02/20/1996
  • Status: Expired due to Fees
First Claim
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1. An apparatus for forming a low density fiber web, comprising:

  • a die head having a central polymer cavity supplying a molten polymer to spinnerettes,a multiplicity of spinnerettes operably joined to said polymer cavity so as to permit the spinning of polymer fibers through a multiplicity of spinnerettes in the die head, in directions that are radially outward from said polymer cavity,a central air supply operably connected to said spinnerettes so as to permit the providing of an attenuating air stream which will serve to carry said polymer fibers in a direction that is radially outward from said polymer cavity,an air ring that surrounds said apparatus and serves to project pressurized air in a direction that is contrary to the direction of the attenuating air stream so as to cause the polymer fibers carried therein to change direction approximately 90 degrees and become entangled, anda collection device positioned so as to receive the attenuating and entangled fibers and form a low density fiber web.

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