Seamed press felt of multilayered base-fabric structure for papermaking and process for producing the same

Abstract

A single-seam felt which employs a base fabric of a multilayer structure and which, despite this, is excellent in wet-web surface smoothness and has satisfactory batt adhesion. It is free from wrap protrusion and weft fraying in the seamed part of the layered base fabric.

1 . Seamed papermaking press felt comprising a woven base material having seam loops at both ends and a batt layer, wherein
 said base material comprises a first base fabric having seam loops at both ends which is joined into an endless form by passing a pintle wire through said seam loops and one or more second base fabric(s) having seam loops at both ends, through which a pintle wire is not passed, which is (are) stacked onto said first base fabric,   said batt layer, which is disposed at least on the wet paper side of said base material and is entangled with said base material, is cut in the widthwise direction in the vicinity of the seam loop part of said second base fabric.   
     
     
         2 . Seamed papermaking press felt according to  claim 1 , wherein the weight per area unit of the second base fabric is lower than the weight per area unit of the first base fabric. 
     
     
         3 . Seamed papermaking press felt according to  claim 1 , wherein the opening formed by the seam loops of the second base fabric is smaller than the opening formed by the seam loops of the first base fabric. 
     
     
         4 . Seamed papermaking press felt according to  claim 1 , wherein the loop length and loop height of the seam loops of the second basic fabric are respectively smaller than the loop length and loop height of the first base fabric. 
     
     
         5 . Seamed papermaking press felt according to  claim 1 , wherein, in the vicinity of the seam loop part of the second base fabric, yarns are further disposed to reduce the opening formed by the seam loop of the second base fabric. 
     
     
         6 . Seamed papermaking press felt according to  claim 5 , wherein the yarns are multi-filaments, bulky yarns or spun yarns. 
     
     
         7 . A kit comprising a seamed papermaking press felt, which comprises a woven base material having seam loops at both ends and a batt layer, and only one pintle wire to be passed through the seam loops, wherein
 said base material comprises a first base fabric having seam loops at both ends and one or more second base fabric(s) having seam loops at both ends which is (are) stacked onto said first base fabric,   said batt layer, which is attached by entanglement at least to the wet paper side of said base material, is cut in the widthwise direction at the seam loop part of said second base fabric or in the vicinity thereof,   said pintle wire joins said first base fabric into an endless form on the papermaking machine by being passed through the seam loops of said first base fabric.   
     
     
         8 . A method for producing a seamed papermaking press felt comprising a woven base material having seam loops at both ends and a batt layer, comprising
 a process for making said base material by stacking one or more second base fabric(s) having seam loops at both ends onto a first base fabric having seam loops at both ends,   a process for making endless forms by joining the seam loops of one end of said first base fabric with the seam loops of the other end via a pintle wire and by joining the seam loops of one end of said second base fabric with the seam loops of the other end via a pintle wire,   a process for entangling a batt layer with said base material by disposing it on the wet paper side of said base material which comprises said first base fabric and said second base fabric which have been made into endless forms,   a process for making open-ended forms of said first base fabric and said second base fabric by withdrawing the pintle wires from the seam loops of both said first base fabric and said second base fabric,   a process for making an open-ended felt by cutting said batt layer in the widthwise direction at the seam loop part of said second base fabric or in the vicinity thereof, and   a process for making an endless form on the papermaking machine by re-inserting a pintle wire only into said first base fabric.   
     
     
         9 . A method for producing a seamed papermaking press felt according to  claim 8 , further comprising a process for weaving yarns in the vicinity of the seam loop part of said second base fabric, when said second base fabric is woven, to reduce the opening formed by the seam loops of said second base fabric. 
     
     
         10 . A method for producing a seamed papermaking press felt according to  claim 8 , further comprising a process for inserting yarns in the vicinity of the seam loop part of said second base fabric, after weaving the second base fabric and before entangling the batt part with the base material, to reduce the opening formed by the seam loops of said second base fabric.