Method for weaving a filter fabric belt for pressure filter apparatus

  • US 5,615,713 A
  • Filed: 09/29/1995
  • Issued: 04/01/1997
  • Est. Priority Date: 07/08/1994
  • Status: Expired due to Term
First Claim
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1. A method of forming a belt filter medium by machine weaving a dimensionally stable controlled permeability woven fabric for use as a belt filter medium in a pressure filter machine, said woven fabric having warp yarns in the direction of said machine and weft yarns in a cross direction of said machine and being adapted for repeated use as a belt filter medium in said pressure filter machine, comprising the steps of:

  • a) in a weaving loom machine establishing a plurality of individual parallel sized warp yarns with the axis of said warp yarns being in the machine direction of said machine, each of said warp yarns having a total density of about 2,000 denier,b) placing each warp yarn under equal tension in said machine direction with resulting tension on said woven fabric being about 200 to about 5,000 pounds,c) weaving a plurality of sized weft yarns through said warp yarns with the axis of said weft yarns being in a cross direction of said machine and placing each of said weft yarns under equal tension in said cross machine direction to produce said woven fabric,d) transporting said woven fabric from said weaving loom while maintaining said woven fabric under tension by uniformly pulling said warp yarns,e) passing said woven fabric with tensioned warp yarns through a heating means having a temperature range of about 200°

    F. to about 400°

    F. to heat set and crimp said warp and weft yarns of said woven fabric, the size of said weft yarns and said warp yarns being related to each other to cause said warp yarns and said weft yarns to become crimped during said heat set step to produce said dimensional stability in said woven fabric,f) maintaining said tension on said woven fabric as said fabric is accumulated as a continuous woven fabric,g) and forming said woven fabric as a continuous belt filter medium for use in said pressure filter machine by joining the ends of the woven fabric.

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