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Polymer fiber tubular structure having kinking resistance

  • US 7,276,271 B2
  • Filed: 03/19/2002
  • Issued: 10/02/2007
  • Est. Priority Date: 12/19/2000
  • Status: Expired due to Fees
First Claim
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1. An apparatus for forming a tubular structure having improved kinking resistance from a liquefied polymer, the apparatus comprising:

  • (a) a dispenser for dispensing the liquefied polymer;

    (b) a precipitation electrode being at a first potential relative to said dispenser, said precipitation electrode being designed and constructed for generating a fibrous polymeric shell thereupon; and

    (c) a pressing mechanism for increasing a local density of said polymeric shell in a plurality of predetermined sub-regions of said polymeric shell, thereby to provide a tubular structure having an alternating density in a longitudinal direction, wherein the alternating density regions formed comprises compressed sub-regions and non-compressed sub-regions in a longitudinal direction of the tubular structure, wherein a basis weight of said compressed sub-regions is larger than a basis weight of said non-compressed sub-regions.

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