Pin seamed press felt with base fabric with monofilament and cabled md yarns

Abstract

A press felt for a papermaking machine includes: (a) a base fabric comprising a plurality of repeat units, each of the repeat units comprising a plurality of cross machine direction (CMD) yarns and a plurality of machine direction (MD) yarns interwoven with the CMD yarns, wherein the machine direction yarns comprise a first set of MD yarns and a second set of MD yarns, wherein the first yarns include seam loops at their ends and the second yarns are devoid of seam loops at their ends; and (b) at least one batt layer overlying the base fabric.

That which is claimed is: 
     
         1 . A press felt for a papermaking machine, comprising:
 (a) a base fabric comprising a plurality of repeat units, each of the repeat units comprising a plurality of cross machine direction (CMD) yarns and a plurality of machine direction (MD) yarns interwoven with the CMD yarns, wherein the machine direction yarns comprise a first set of MD yarns and a second set of MD yarns, wherein the first yarns include seam loops at their ends and the second yarns are devoid of seam loops at their ends; and   (b) at least one bat layer overlying the base fabric.   
     
     
         2 . The press felt defined in  claim 1 , wherein the first set of MD yarns comprises monofilament yarns. 
     
     
         3 . The press felt defined in  claim 2 , wherein the second set of MD yarns comprises cabled yarns. 
     
     
         4 . The press felt defined in  claim 1 , wherein the CMD yarns comprise cabled yarns. 
     
     
         5 . The press felt defined in  claim 1 , further comprising a pintle inserted through the seam loops of the first set of MD yarns. 
     
     
         6 . The press felt defined in  claim 1 , wherein the MD yarns of the first set alternate with the MD yarns of the second set. 
     
     
         7 . A press felt for a papermaking machine, comprising:
 (a) a base fabric comprising a plurality of repeat units, each of the repeat units comprising a plurality of cross machine direction (CMD) yarns and a plurality of machine direction (MD) yarns interwoven with the CMD yarns, wherein the machine direction yarns comprise a first set of MD yarns and a second set of MD yarns, wherein the first yarns include seam loops at their ends and the second yarns are devoid of seam loops at their ends, and wherein the first yarns differ in type from the second yarns; and   (b) a batt layer overlying the base fabric.   
     
     
         8 . The press felt defined in  claim 7 , wherein the first set of MD yarns comprises monofilament yarns. 
     
     
         9 . The press felt defined in  claim 8 , wherein the second set of MD yarns comprises cabled yarns. 
     
     
         10 . The press felt defined in  claim 7 , wherein the CMD yarns comprise cabled yarns. 
     
     
         11 . The press felt defined in  claim 7 , further comprising a pintle inserted through the seam loops of the first set of MD yarns. 
     
     
         12 . The press felt defined in  claim 7 , wherein the MD yarns of the first set alternate with the MD yarns of the second set. 
     
     
         13 . A press felt for a papermaking machine, comprising:
 (a) a base fabric comprising a plurality of repeat units, each of the repeat units comprising a plurality of cabled cross machine direction (CMD) yarns and a plurality of machine direction (MD) yarns interwoven with the CMD yarns, wherein the machine direction yarns comprise a first set of MD yarns and a second set of MD yarns, wherein the first yarns include seam loops at their ends and the second yarns are devoid of seam loops at their ends, and wherein the first yarns are monofilament yarns and the second yarns are cabled yarns; and   (b) a batt layer overlying the base fabric.   
     
     
         14 . The press felt defined in  claim 13  further comprising a pintle inserted through the seam loops of the first set of MD yams. 
     
     
         15 . The press felt defined in  claim 13 , wherein the MD yarns of the first set alternate with the MD yarns of the second set.