Integral nip press belt

Abstract

Nip press belt of a wet press or a calender with elongated nip, in particular for a paper, cardboard or tissue machine, with a flexible elastomer or thermoplastic layer that is impermeable to liquids, one surface of which during operation serves as the sliding layer, being in contact with the pressing element, and with an integral, textile-based carrier- and function-layer that is intimately and fixedly connected to the other surface of the sliding layer and has a free superficial region that acts as water-extraction profile.

1 . Nip press belt of a wet press or a calendar with elongated nip, in particular for a paper, cardboard or tissue machine, with a flexible elastomer or thermoplastic layer that is impermeable to liquids, one surface of which during operation serves as the sliding layer, being in contact with the pressing element, characterized by an integral, textile-based carrier-and function-layer that is intimately and fixedly connected to a second opposed surface of the flexible layer and has a free superficial region that acts as water-extraction profile.  
     
     
         2 . Nip press belt according to  claim 1 , characterized in that the integral carrier-and function-layer comprises a single-lamina base fabric, in the form of a stitched-together or continuous fabric made of twisted or untwisted monofilaments.  
     
     
         3 . Nip press belt according to  claim 1 , characterized in that the integral carrier-and function-layer comprises a multiple-lamina base fabric, in the form of a stitched-together or continuous fabric made of twisted or untwisted monofilaments.  
     
     
         4 . Nip press belt according to  claim 1 , characterized in that a substantial fraction of the thickness of the integral carrier-and function-layer serves as a water-extraction profile for the object to be pressed, whereas the remaining fraction of the thickness is fixedly connected to the sliding layer.  
     
     
         5 . Nip press belt according to  claim 1 , characterized in that a surface facing toward the object to be pressed comprises none of the water-extraction structure additionally impressed onto the textile structure.  
     
     
         6 . Nip press belt according to  claim 1 , characterized in that the flexible layer is made of polyurethane or a soft-rubber material.  
     
     
         7 . Nip press belt according to  claim 1 , characterized in that the flexible layer comprises a thermoplastic resin.  
     
     
         8 . Nip press belt according to  claim 1 , characterized in that the flexible layer comprises a thermoplastic film.  
     
     
         9 . A method of manufacturing a nip press belt as defined in  claim 1 , characterized in that the flexible layer is applied to a cylindrical carrier so as to cover its circumference, and subsequently a quasi-continuous or spliced textile material with shrinkage properties is pulled onto the carrier, over the flexible layer, and flexible layer and textile carrier are together subjected to a thermal treatment in which the textile carrier shrinks onto the flexible layer and becomes intimately connected therewith.  
     
     
         10 . Method of manufacturing a nip press belt as defined in  claim 1 , characterized in that a quasi-continuous or spliced textile material is stretched onto a cylindrical carrier and stitched together to form a seam, after which a flexible-layer material is applied to the textile carrier and during the process of cross-linking/hardening becomes intimately connected therewith.  
     
     
         11 . Method according to  claim 10 , characterized in that the region of the seam is covered by a strip of plastic film before the flexible-layer material is applied.