Paper-machine felt

D - Textiles – Paper – 01 – F

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Details

D01F 11/08 (2006.01) D04H 1/42 (2006.01) D04H 1/60 (2006.01) D04H 13/00 (2006.01) D21F 7/08 (2006.01)

Patent

CA 2156294

The invention relates to postcondensed paper machine felts com- prising a polyamide base fabric and a polyamide coating needled thereon, the paper machine felts having a relative solution viscosity in sulfuric acid in accordan- ce with the DIN 53,727 standard of 5 or more. The invention further relates to a method of increasing the molecular weight of paper machine felts which comprises impregnating the paper machine felts with a solution of postcondensation catalysts, followed by drying and ther- mally postcondensing the felts below the melting point of the polyamide in a solid phase by the exclusion of oxygen.

La présente invention concerne un feutre recondensé pour machines à papier, se composant d'un tissu de base en polyamide et d'une couche de couverture de polyamide épinglée, ce feutre possédant une viscosité de dissolution relative dans l'acide sulfurique de 5 au moins selon la norme DIN 53 727. Cette invention concerne également un procédé pour l'augmentation du poids moléculaire des feutres pour machine à papier, selon lequel on imprègne le feutre d'une solution catalytique de recondensation, on le séche ensuite, puis on le recondense thermiquement à l'état solide, en l'absence d'oxygène, au-dessous du point de fusion du polyamide.

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