Anti-contaminant treatment for papermaking fabrics
AssigneeHuyck Corporation
InventorsMohan L. Sanduja, Paul Thottathil
Life of this patent
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Abstract
A papermaking fabric having permanent resistance to adhesion of contaminants, and a method to make such a fabric by treatment of a papermakers fabric with a solution having as its primary components tetrafluoroethylene, urethane copolymer and polyacrylamide. The treatment, prepared in a solution, is coated on the fabric and cured to impart permanent anti-sticking properties to the fabric.
Claims7
A papermaking fabric comprising an endless belt woven from interwoven machine direction yarns and cross machine direction yarns, said belt coated with an anti-contaminant coating of:
- 20-30 parts by weight polytetrafluoroethylene;
- 20-30 parts by weight urethane copolymer;
- 10-15 parts by weight polyacrylamide;
- 2-4 parts by weight acrylic copolymer;
- 0.5-1.5 parts by weight methylene bisacrylamide;
- 0.5-1.5 parts by weight polyaziridine crosslinker;
- 0.5-1.5 parts by weight methyl pyrolidone;
- 0.5-1.0 parts by weight ammonium persulfate 10% solution;
- 0.5-1.0 parts by weight sodium metabisulfite 10% solution;
- 0.5-1.0 parts by weight urea peroxide 0.1% solution;
- and 0.0005-0.001 parts by weight silver nitrate 0.1% solution, diluted to 1% solids solution and dried to cure the coating to the fabric.
A method for producing a papermaking fabric having permanent anti-sticking properties:
- providing a fabric of interwoven machine direction yarns and cross machine direction yarns;
- soaking the fabric in a 1% solids solution of the composition of 20-30 parts by weight polytetrafluoroethylene;
- 20-30 parts by weight urethane copolymer;
- 10-15 parts by weight polyacrylamide;
- 2-4 parts by weight acrylic copolymer;
- 0.5-1.5 parts by weight methylene bisacrylamide;
- 0.5-1.5 parts by weight polyaziridine crosslinker;
- 0.5-1.5 parts by weight methyl pyrolidone;
- 0.5-1.0 parts by weight ammonium persulfate 10% solution;
- 0.5-1.0 parts by weight sodium metabisulfite 10% solution;
- 0.5-1.0 parts by weight urea peroxide 0.1% solution;
- and 0.0005-0.001 parts by weight silver nitrate 0.1% solution;
- and
- heating the soaked fabric at 200.degree.-400.degree. F. to cure the coating to the fabric.
Dependencies are inferred from the claim text.