Seamed Felt for Papermaking

Abstract

A papermaking seamed felt 10 of the present invention comprises a base layer 30 having a seam part, a wet paper web side batt fiber layer 20 formed on the wet paper web side surface of said base layer, and a press side batt fiber layer 21 formed on the press side surface thereof, wherein said wet paper web side batt fiber layer 20 having a core-in-sheath fiber 41 comprising a core member made of high-molecular-weight nylon with an absolute viscosity of 80 mPa·s or more and a sheath member made of nylon with a lower melting point than the core member. A net-shaped fiber layer is formed with melted sheath members of the core-in-sheath fiber 41 , which makes the wet paper web side batt fiber layer 20 dense. As a result, the wet paper web side batt fiber layer 20 works as a barrier to block water within the press side layer from moving to the wet paper web side, thereby preventing rewetting. Further, the felt acquires a balanced combination of smoothness, resistance to shedding, abrasion, and compression fatigue by providing the core member of the core-in-sheath fiber 41 with high viscosity, i.e. by using high-molecular-weight nylon.

1 . A seamed felt for papermaking comprising a base layer having a seam part, a wet paper web side batt fiber layer formed on the wet paper web side surface of said base layer, and a press side batt fiber layer formed on the press side surface thereof; characterized in that said wet paper web side batt fiber layer includes a core-in-sheath fiber comprising a core member made of high-molecular-weight nylon with an absolute viscosity of 80 mPa·s or more and a sheath member made of nylon with a lower melting point than the core member, wherein a net-shaped fiber layer is formed with melted sheath members of said core-in-sheath fiber. 
   
   
       2 . A seamed felt as claimed in  claim 1 , wherein the content rate of said core-in-sheath fiber within said wet paper web side batt fiber layer is in the range of 20-80%. 
   
   
       3 . (canceled) 
   
   
       4 . A seamed felt as claimed in  claim 1 , wherein said wet paper web side batt fiber layer is multi-layered, in which the content rate of said core-in-sheath fiber increases incrementally from the press side toward the wet paper web side thereof. 
   
   
       5 . A seamed felt as claimed in  claim 2 , wherein said wet paper web side batt fiber layer is multi-layered, in which the content rate of said core-in-sheath fiber increases incrementally from the press side toward the wet paper web side thereof.