Dryer Fabric

Abstract

A dryer filtration fabric for use in a drying section of a machine for producing and/or processing a fibrous web, in particular paper, cardboard, tissue or non-woven, has machine direction threads interwoven with machine cross direction threads to form a single-ply woven fabric having an air permeability between 40 cfm and 330 cfm. The machine direction threads and the machine cross direction threads have a flattened cross-sectional shape with a width-to-height ratio of more than 1. Each of the machine direction threads runs over and/or under a maximum of three, preferably a maximum of two, machine cross direction threads that are disposed directly beside one another. The number of the machine direction threads per 10 cm, viewed in the machine cross direction, lies in the range from 170 to 200, and the filling level of the machine direction threads lies in the range from 90% to 110%.

1 - 14 . (canceled) 
     
     
         15 . A dryer fabric for use in a drying section of a machine for producing and/or processing a fibrous web, the fabric comprising:
 machine direction threads that are disposed beside one another in a machine cross direction and interwoven with machine cross direction threads that are disposed beside one another in the machine direction to form a single-ply woven fabric having an air permeability in the range from 40 cfm to 330 cfm;   said machine direction threads and said machine cross direction threads having a flattened cross-sectional shape with a width-to-height ratio of greater than 1;   each of said machine direction threads, when interwoven with said machine cross direction threads, running over and/or under a maximum of three directly adjacent machine cross direction threads;   wherein a number of machine direction threads per 10 cm, viewed in the machine cross direction, lies in a range from 160 to 185, and a filling level of the machine direction threads lies in a range from 90% to 115%.   
     
     
         16 . The dryer fabric according to  claim 15 , wherein each of said machine direction threads runs over and/or under a maximum of two said machine cross direction threads that lie directly next to one another. 
     
     
         17 . The dryer fabric according to  claim 15 , wherein the filling level of said machine direction threads lies in a range from 95% to 111%. 
     
     
         18 . The dryer fabric according to  claim 15 , wherein said machine cross direction threads have a cross-sectional shape selected from the group consisting of bone-shaped and lenticular. 
     
     
         19 . The dryer fabric according to  claim 15 , wherein the width-to-height ratio of said machine direction threads is in a range from 1.7 to 1.9. 
     
     
         20 . The dryer fabric according to  claim 19 , wherein said machine direction threads have a height of 0.4 mm and a width of 0.6 mm. 
     
     
         21 . The dryer fabric according to  claim 15 , wherein said machine direction threads form groups of groups of machine direction threads that are disposed directly beside one another, and said machine direction threads of a respective group in a side-by-side manner, following the same weaving path, are interwoven with said machine cross direction threads. 
     
     
         22 . The dryer fabric according to  claim 15 , wherein each of said machine direction threads, when interwoven with said machine cross direction threads, runs over and/or under a single machine cross direction thread. 
     
     
         23 . The dryer fabric according to  claim 21 , wherein said machine direction threads and said machine cross direction threads are interwoven in a plain weave. 
     
     
         24 . The dryer fabric according to  claim 15 , wherein the number of machine cross direction threads per 10 cm, viewed in the machine direction, lies in a range from 15 to 55. 
     
     
         25 . The dryer fabric according to  claim 15 , wherein said machine cross direction threads have a height in a range from 0.7 mm to 0.8 mm, and a width of 1.6 mm. 
     
     
         26 . The dryer fabric according to  claim 15 , wherein said machine direction threads and said machine cross direction threads consist essentially of polyethylene terephthalate (PET). 
     
     
         27 . The dryer fabric according to  claim 15 , wherein:
 between 40% and 60% of said machine direction threads essentially consist of polyethylene terephthalate (PET), between 60% and 40% of said machine direction threads essentially consist of polyphenylene sulfide (PPS); and   said machine cross direction threads essentially consist of PET; or   between 40% and 60% of said machine cross direction threads essentially consist of PET and between 60% and 40% of said machine cross direction threads essentially consist of PPS.   
     
     
         28 . The dryer fabric according to  claim 15 , wherein:
 between 40% and 60% of said machine direction threads essentially consist of polyphenylene sulfide (PPS) and between 60% and 40% of said machine direction threads essentially consist of PCTA; and   said machine cross direction threads essentially consist of PCTA; or   between 40% and 60% of said machine cross direction threads essentially consist of PCTA, and between 60% and 40% of said machine cross direction threads essentially consist of PPS.   
     
     
         29 . The dryer fabric according to  claim 15 , wherein said machine direction threads are substantially from PPS, and said machine cross direction threads essentially consist of PPS or PCTA.