Method for operating a shoe press, shoe press, machine comprising a shoe press, and use of an ink in a lubricant for a shoe press

Abstract

A shoe press has a shoe on which a radial inner surface of a press jacket slides. In a method of operating the shoe press, lubricating fluid is introduced between the shoe and the press jacket for lubricating purposes. The press jacket has at least one polymer layer into which a reinforcing structure is integrated, the reinforcing structure including at least one reinforcing thread. The lubricating fluid, the at least one polymer layer, and/or the at least one reinforcing thread is/are designed such that the lubricating fluid reaches the at least one reinforcing thread of the reinforcing structure and produces a color change in same in the event the polymer layer breaks. There is also described a shoe press, the inclusion of a press jacket in such a shoe press, and a machine with such a shoe press.

1 - 15 . (canceled) 
     
     
         16 . A method for operating a shoe press, the method comprising providing a press cover with at least one polymer layer having a reinforcing structure embedded therein, the reinforcing structure including at least one reinforcing thread, and the press cover having a radially inner surface for gliding on a shoe of the shoe press;
 introducing a lubricating fluid between the shoe and the press cover for lubrication;   providing the lubricating fluid, the at least one polymer layer, and/or the at least one reinforcing thread such that, in the event of a breakage of the polymer layer, the lubricating fluid reaches the at least one reinforcing thread of the reinforcing structure and brings about a color change of the reinforcing thread.   
     
     
         17 . The method according to  claim 16 , which comprises adding a dye to the lubricating fluid, wherein the dye changes a color of the reinforcing threads of the reinforcing structure in the event of a breakage of the polymer layer. 
     
     
         18 . The method according to  claim 17 , which comprises choosing the dye from the group of luminescent dyes selected from the group consisting of a fluorescent dye and a phosphorescent dye and configured to emit light as a result of energy supplied from outside. 
     
     
         19 . The method according to  claim 17 , which comprises adding a luminescent dye responding to ultraviolet light. 
     
     
         20 . A shoe press, comprising:
 a press cover having at least one polymer layer and a reinforcing structure embedded therein, said reinforcing structure including at least one reinforcing thread, and said press cover having a radially inner surface;   a shoe disposed to have the radially inner surface of said press cover glide thereon;   a lubricant reservoir with lubricating fluid for introducing the lubricating fluid between said shoe and said press cover;   wherein at least one of said lubricating fluid or said at least one reinforcing thread is configured such that, in the event of a breakage of said polymer layer, said lubricating fluid reaches said at least one reinforcing thread of said reinforcing structure and brings about a color change of said at least one reinforcing thread.   
     
     
         21 . The shoe press according to  claim 20 , which comprises dye added to said lubricating fluid, said dye being configured to change a color of the reinforcing threads of said reinforcing structure in the event of a breakage of said polymer layer. 
     
     
         22 . The shoe press according to  claim 21 , wherein the dye is a luminescent dye chosen from the group consisting of fluorescent dye and phosphorescent dye and configured to emit light as a result of energy supplied from outside. 
     
     
         23 . The shoe press according to  claim 21 , wherein the dye is a luminescent dye responding to ultraviolet light. 
     
     
         24 . The shoe press according to  claim 20 , wherein the lubricating fluid is an oil. 
     
     
         25 . The shoe press according to  claim 20 , wherein said at least one polymer layer is produced from polyurethane or comprises a polyurethane, and said at least one reinforcing thread is produced from a polymer or comprises a polymer, and said polymer is selected from the group consisting of polyester, polyethylene naphthalate, and polyamide. 
     
     
         26 . The shoe press according to  claim 20 , wherein said polymer is aramid. 
     
     
         27 . The shoe press according to  claim 20 , wherein a material of said reinforcing structure and a material of said at least one polymer layer have mutually different levels of transmittance for visible light. 
     
     
         28 . The shoe press according to  claim 27 , wherein the transmittance of the material of said at least one polymer layer is higher than the transmittance of said reinforcing structure by more than 1.1-1.5 times. 
     
     
         29 . The shoe press according to  claim 20 , wherein a material of said reinforcing structure and a material of said at least one polymer layer are chosen such that a transmittance of the entire press cover for visible light lies between 5% and 100%. 
     
     
         30 . The shoe press according to  claim 29 , wherein the transmittance of the press cover lies between 15% and 35%. 
     
     
         31 . The shoe press according to  claim 29 , wherein the transmittance of the press cover corresponds to a total transmission according to ASTM D 1003-00 and is measured in a radial direction of the press cover. 
     
     
         32 . The shoe press according to  claim 20 , wherein said at least one polymer layer is undyed. 
     
     
         33 . The shoe press according to  claim 20 , wherein said at least one reinforcing thread is one of a plurality of longitudinal reinforcing threads extending in a longitudinal direction of the press cover, over a circumference of the press cover, and at a spacing distance and parallel to one another. 
     
     
         34 . The shoe press according to  claim 33 , wherein at least one further reinforcing thread is provided as a circumferential thread that extends helically in the circumferential direction of the press cover within said polymer layer, and wherein said longitudinal reinforcing threads and said at least one further reinforcing thread that is formed as a circumferential thread together form a laid fabric, with said longitudinal reinforcing threads being arranged radially within said at least one circumferential thread, viewed in relation to the longitudinal axis of the press cover. 
     
     
         35 . The shoe press according to  claim 20 , wherein said at least one polymer layer is one of a plurality of polymer layers and said at least one polymer layer, viewed in relation to the longitudinal axis of the press cover, is a radially inner or innermost polymer layer and said plurality of polymer layers includes a radially outermost polymer layer. 
     
     
         36 . The shoe press according to  claim 35 , wherein the plurality of polymer layers are exactly two polymer layers with the radially inner polymer layer simultaneously being the radially innermost polymer layer of the press cover. 
     
     
         37 . A machine, comprising a shoe press according to  claim 20 . 
     
     
         38 . In a shoe press having a shoe, a press cover with a radially inner surface disposed to glide on the shoe, and a lubricant reservoir for introducing a lubricating fluid between the shoe and the press cover, the improvement which comprises:
 the press cover having at least one polymer layer and a reinforcing structure embedded in the polymer layer, with the reinforcing structure including at least one reinforcing thread;   the lubricating fluid containing a dye; and   the lubricating fluid and/or the at least one reinforcing thread being configured such that, on occasion of a breakage of the polymer layer, lubricating fluid and the dye reach the at least one reinforcing thread of the reinforcing structure and bring about a color change of the at least one reinforcing thread.   
     
     
         39 . The improvement according to  claim 38 , wherein the dye is a luminescent dye chosen from the group consisting of fluorescent dye and phosphorescent dye and configured to emit light as a result of energy supplied from outside. 
     
     
         40 . The improvement according to  claim 38 , wherein the dye is a luminescent dye responding to ultraviolet light. 
     
     
         41 . The improvement according to  claim 38 , wherein the lubricating fluid is an oil.