Press cover, use thereof, and press roll, shoe press and use of a reinforcing thread in a press cover

Abstract

A press cover contains at least one polymer layer in which a reinforcing structure is embedded. The reinforcing structure contains at least one reinforcing thread, wherein the material of the reinforcing structure and that of the at least one polymer layer are selected such that the visible light transmittances thereof differ from each other.

1 - 16 . (canceled) 
     
     
         17 . A press cover, comprising:
 at least one polymer layer; and   a reinforcing structure embedded in said at least one polymer layer, said reinforcing structure having at least one reinforcing thread, wherein a material of said reinforcing structure and that of said at least one polymer layer are chosen in such a way that visible light transmittances thereof differ from one another.   
     
     
         18 . The press cover according to  claim 17 , wherein a transmittance of said material of said at least one polymer layer is higher than a transmittance of said reinforcing structure. 
     
     
         19 . The press cover according to  claim 17 , wherein a transmittance of said material of said at least one polymer layer is between 50% and 90%. 
     
     
         20 . The press cover according to  claim 17 , wherein:
 said at least one polymer layer is produced from polyurethane or contains said polyurethane; and   said at least one reinforcing thread is produced from a polymer or contains said polymer, said polymer is selected from the group consisting of a polyester, polyethylene naphthalate and polyamide.   
     
     
         21 . The press cover according to  claim 17 , wherein said at least one polymer layer is uncolored. 
     
     
         22 . The press cover according to  claim 17 , wherein said at least one reinforcing thread is provided as a longitudinal thread, which extends in a longitudinal direction of the press cover. 
     
     
         23 . The press cover according to  claim 22 , wherein said at least one reinforcing thread is one of a plurality of reinforcing threads provided as longitudinal threads which, extend in the longitudinal direction of the press cover, and are disposed parallel to one another at a distance over a circumference of the press cover. 
     
     
         24 . The press cover according to  claim 23 , further comprising at least one further reinforcing thread as a circumferential thread. 
     
     
         25 . The press cover according to  claim 24 , wherein said reinforcing threads configured as said longitudinal threads and said at least one further reinforcing thread configured as said circumferential thread form a laid fabric with one another. 
     
     
         26 . The press cover according to  claim 25 , wherein as viewed in a radial direction of the press cover, said longitudinal threads are spaced apart in the radial direction relative to said circumferential thread at crossing points. 
     
     
         27 . The press cover according to  claim 17 , wherein said at least one polymer layer is one of a plurality of polymer layers, said at least one polymer layer, viewed in relation to a longitudinal axis of the press cover, is a radially inner or innermost polymer layer and, a further polymer layer of said polymer layers is a radially outermost polymer layer of said polymer layers, viewed in relation to the longitudinal axis of the press cover. 
     
     
         28 . The press cover according to  claim 27 , wherein said plurality of polymer layers is exactly two polymer layers, and said radially inner polymer layer is at a same time the radially innermost polymer layer of the press cover. 
     
     
         29 . The press cover according to  claim 18 , wherein the transmittance of said material of said at least one polymer layer is 1.1. to 1.5 times higher than the transmittance of said reinforcing structure. 
     
     
         30 . The press cover according to  claim 19 , wherein the transmittance of said material of said at least one polymer layer is between 50% and 75%. 
     
     
         31 . The press cover according to  claim 24 , wherein said circumferential thread extends in a form of a helix in a circumferential direction of the press cover within the at least one polymer layer. 
     
     
         32 . The press cover according to  claim 25 , wherein said reinforcing threads configured as said longitudinal threads and said at least one further reinforcing thread configured as said circumferential thread form said laid fabric in such a way that said longitudinal threads are disposed radially within said circumferential thread, viewed in relation to a longitudinal axis of the press cover. 
     
     
         33 . A press roll for a shoe press for treating a fibrous web, the press roll comprising:
 at least one press cover according to  claim 17 .   
     
     
         34 . A shoe press for treating a fibrous web, the shoe press comprising:
 a press roll and an opposing roll which together form or delimit a nip, wherein said press roll containing a circulating press cover, said circulating press cover being formed according to  claim 17 .   
     
     
         35 . A method of using a press cover, which comprises the steps of:
 providing the press cover according to  claim 17  for a press for treating a fibrous web.   
     
     
         36 . A method of building a structure, which comprises the steps of:
 disposing at least one reinforcing thread, functioning as a reinforcing structure, in a press cover, the press cover having at least one polymer layer in which the reinforcing structure is embedded, wherein a material of the reinforcing structure and that of the at least one polymer layer are chosen in such a way that visible light transmittances thereof differ from one another.