Multiaxial pin seamed papermaker's press felt

Abstract

A multilayer papermaker's press felt fabric comprising in combination a woven first fabric layer, typically a double layer fabric, has a cross machine direction pin seam. A second fabric layer is located on the paper side face of the first fabric layer, and a layer of needled batt is applied to the paper side face of the second layer binding the layers together. A flap comprising a short length of the second fabric layer with attached batt overlays the pin seam area in the first layer. The second layer comprises a plurality of relatively narrow strips, which are located with a lateral edge at a first cant angle of from more than 1° to less than 20° to the machine direction. A third layer, similar to the second layer, can be included on the machine side of the first layer; the strip widths, the cant angles, and the direction of the cant angle relative to the machine direction for each of the two strips need not be the same. The fabric is assembled using a spiral winding technique.

1. A multilayer papermaker's press felt fabric comprising in combination:
 a woven first fabric layer incorporating therein a cross machine direction pin seam,  
 a second fabric layer on the paper side face of the first fabric layer,  
 a layer of needled batt applied to the paper side face of the second layer which penetrates into the first fabric layer thereby binding the first and second layer together, and  
 a flap comprising a short length of the second fabric layer with attached batt overlaying the pin seam in the first layer, wherein: 
 (a) the second layer comprises a plurality of relatively narrow strips, and  
 (b) the strips of the second layer are located with a lateral edge at a first cant angle to the machine direction, and  
 (c) the first cant angle has a value of from more than 1° to less than 20°.  
 
 
     
     
       2. A fabric according to  claim 1  further including a third layer on the machine side of the first layer wherein:
   (a) the third layer comprises a plurality or relatively narrow strips, and    (b) the strips of the third layer are located with a lateral edge at a second cant angle to the machine direction, and    (c) the second cant angle has a value of from more than 1° to less than 20°.    
 
     
     
       3. A fabric according to  claim 1  wherein the first cant angle has a value of from more than 1° to less than 10°. 
     
     
       4. A fabric according to  claim 2  wherein the first cant angle for the second fabric layer has a value of from more than 1° to less than 10°. 
     
     
       5. A fabric according to  claim 1  wherein the second cant angle for the third fabric layer has a value of from more than 1° to less than 10°. 
     
     
       6. A fabric according to  claim 2  wherein the cant angles of the second and third fabric layers are the same. 
     
     
       7. A fabric according to  claim 2  wherein the cant angles of the second and third fabric layers are not the same. 
     
     
       8. A fabric according to  claim 2  wherein the cant angles of the second and third fabric layers are in the same sense relative to the machine direction. 
     
     
       9. A fabric according to  claim 2  wherein the cant angles of the second and third fabric layers are not in the same sense relative to the machine direction. 
     
     
       10. A fabric according to  claim 1  wherein the ratio of the widths of the first and second layers  layer and the strips of the second layer is at least 2:1. 
     
     
       11. A fabric according to  claim 2  wherein the ratio of the widths of the first and second layers  layer and the strips of the second layer is at least 2:1. 
     
     
       12. A fabric according to  claim 2  wherein the ratio of the widths of the first and third layers  layer and the strips of the third layer is at least 2:1. 
     
     
       13. A fabric according to  claim 2  wherein the widths of the second and third layers are the same. 
     
     
       14. A fabric according to  claim 2  wherein the widths of the second and third layers are not the same. 
     
     
       15. A fabric according to  claim 1  wherein the batt is oriented in a desired direction. 
     
     
       16. A fabric according to  claim 1  wherein the second fabric layer is of woven or knitted construction. 
     
     
       17. A fabric according to  claim 2  wherein the batt is oriented in a desired direction. 
     
     
       18. A fabric according to  claim 2  wherein the second fabric layer is of woven or knitted construction. 
     
     
       19. A fabric according to  claim 2  wherein the third fabric layer is of woven or knitted construction. 
     
     
       20. A fabric according to  claim 1  wherein the first layer is woven as a double layer fabric. 
     
     
       21. A fabric according to  claim 2  wherein the first layer is woven as a double layer fabric. 
     
     
       22. A fabric according to  claim 1  wherein the ratio of the widths of the first and second layers  layer and the strips of the second layer is from at least 2:1 to 20:1. 
     
     
       23. A fabric according to  claim 2  wherein the ratio of the widths of the first and second layers  layer and the strips of the second layer is from at least 2:1 to 20:1. 
     
     
       24. A fabric according to  claim 2  wherein the ratio of the widths of the first and third layers  layer and the strips of the third layer is from at least 2:1 to 20:1.