Smoothing Press Apparatus

Abstract

In order to provide a smoothing press apparatus suitable to be applied to a closed draw type paper machine for allowing the surface of the wet paper to be smoothed and papermaking to be performed in a high speed, [Means for Achieving the Object] the smoothing press apparatus 100 is mounted on a last stage of the press part 11 of the closed draw type paper machine, and includes a smoothing press 17 having a pair of press rolls 23 and 25 , a smoothing belt 27 interposed between the smoothing press 17 together with the wet paper W to smooth the surface of the wet paper, and a wet paper conveyer felt 21 for conveying the wet paper W and passing over it to the smoothing belt 27.

1 . A smoothing press apparatus mounted in a press device provided in a press part of a closed draw type paper machine, the smoothing press apparatus comprising:
 a first press roll having a smooth surface;   a second press roll having a smooth surface and facing the first press roll to each other;   a smoothing belt interposed between the first and second press rolls together with wet paper to smooth a surface of the wet paper; and   a wet paper conveyer felt for conveying the wet paper and passing over it to the smoothing belt,   wherein the wet paper conveyer felt has a wet paper contact fiber layer that includes at least a splittable fiber and directly makes contact with the wet paper, and   wherein the smoothing belt includes a base body and a polyurethane layer that directly makes contact with the wet paper.   
     
     
         2 . The smoothing press apparatus of  claim 1 , wherein polyurethane included in the polyurethane layer of the smoothing belt contains a non-reactive polydimethylsiloxane liquid and has a hardness degree of 90° to 98° in a JIS A hardness standard. 
     
     
         3 . The smoothing press apparatus of  claim 1 , wherein polyurethane included in the polyurethane layer of the smoothing belt is a mixture of polyurethane having a hardness degree of 90° to 95° in a JIS A hardness standard and containing a non-reactive polydimethylsiloxane liquid and polyurethane having a hardness degree of 95° to 98° in a JIS A hardness standard and not containing a non-reactive polydimethylsiloxane liquid. 
     
     
         4 . The smoothing press apparatus of  claim 1 , wherein polyurethane included in the polyurethane layer of the smoothing belt is formed by curing a mixture of urethane polymer, a curing agent, and a non-reactive polydimethylsiloxane liquid having a weight percentage of 0.5 to 25 wt % with respect to a summed amount of the urethane polymer and the curing agent. 
     
     
         5 . The smoothing press apparatus of  claim 4 , wherein the curing agent is dimethylthiotoluenediamine or methylene-bisorthochloroaniline. 
     
     
         6 . The smoothing press apparatus of  claim 1 , wherein the wet paper conveyer felt comprises:
 a base body;   a first batt layer formed on a surface of the wet paper side of the base body;   a second batt layer formed on a surface of the roll side of the base body; and   a wet paper contact fiber layer including a splittable fiber and formed on a surface of the wet paper side of the first batt layer to directly make contact with the wet paper.   
     
     
         7 . The smoothing press apparatus of  claim 1 , wherein the wet paper conveyer felt comprises:
 a base body;   a first batt layer formed on a surface of the wet paper side of the base body;   a second batt layer formed on a surface of the roll side of the base body;   a wet paper contact fiber layer including a plurality of splittable fibers split into filaments and a polymer elastic material impregnated into intervals of the filaments, the wet paper contact fiber layer being formed on a surface of the wet paper side of the first batt layer so that the filaments and the polymer elastic material directly make contact with the wet paper; and   a hydrophilic non-woven layer disposed between the first batt layer and the wet paper contact fiber layer.   
     
     
         8 . The smoothing press apparatus of  claim 7 , wherein the polymer elastic material contained in the wet paper contact fiber layer has a weight percentage of 1 to 10 wt %. 
     
     
         9 . The smoothing press apparatus of  claim 6 , wherein the fiber contained in the wet paper contact fiber layer is composed of a splittable fiber having a weight percentage of 15 to 100 wt % and a non-splittable fiber occupying the remaining portion. 
     
     
         10 . The smoothing press apparatus of  claim 6 , wherein the splittable fiber has a fiber fineness of 3.3 dtex or less before splitting. 
     
     
         11 . A smoothing press apparatus mounted in a press device provided in a press part of a closed draw type paper machine, the smoothing press apparatus comprising:
 a first press roll having a smooth surface;   a second press roll having a smooth surface and facing the first press roll to each other;   a smoothing belt interposed between the first and second press rolls together with wet paper to smooth a surface of the wet paper; and   a wet paper conveyer felt for conveying the wet paper and passing over it to the smoothing belt,   wherein the wet paper conveyer felt has a 3-dimensional woven structure including a base body, a batt layer, two stitch grounds, and interlink yarns for interlinking the two stitch grounds, part of the interlink yarns being crosslinked diagonally, and   wherein the smoothing belt includes at least a wet paper contact fiber layer that includes a splittable fiber and directly makes contact with the wet paper.   
     
     
         12 . The smoothing press apparatus of  claim 11 , wherein the smoothing belt comprises:
 a base body;   a first batt layer formed on a surface of the wet paper side of the base body;   a second batt layer formed on a surface of the roll side of the base body; and   a wet paper contact fiber layer including a splittable fiber and formed on a surface of the wet paper side of the first batt layer, the wet paper contact fiber layer to directly make making contact with the wet paper.   
     
     
         13 . The smoothing press apparatus of  claim 11 , wherein the smoothing belt comprises:
 a base body;   a first batt layer formed on a surface of the wet paper side of the base body;   a second batt layer formed on a surface of the roll side of the base body; and   a wet paper contact fiber layer including a plurality of splittable fibers split into filaments and a polymer elastic material impregnated into intervals of the filaments, the wet paper contact fiber layer being formed on a surface of the wet paper side of the first batt layer so that the filaments and the polymer elastic material directly make contact with the wet paper; and   a hydrophilic non-woven layer disposed between the first batt layer and the wet paper contact fiber layer.   
     
     
         14 . The smoothing press apparatus of  claim 13 , wherein the polymer elastic material contained in the wet paper contact fiber layer has a weight percentage of 1 to 10 wt %. 
     
     
         15 . The smoothing press apparatus of  claim 11 , wherein the fiber contained in the wet paper contact fiber layer is composed of a splittable fiber having a weight percentage of 15 to 100 wt % and a non-splittable fiber occupying the remaining portion. 
     
     
         16 . The smoothing press apparatus of  claim 11 , wherein the splittable fiber has a fiber fineness of 3.3 dtex or less before splitting. 
     
     
         17 . A smoothing press apparatus mounted in a press device provided in a press part of a closed draw type paper machine, the smoothing press apparatus comprises:
 a first press roll having a smooth surface;   a second press roll having a smooth surface and facing the first press roll to each other;   a smoothing belt interposed between the first and second press rolls together with wet paper to smooth a surface of the wet paper; and   a wet paper conveyer felt for conveying the wet paper and passing over it to the smoothing belt,   wherein the wet paper conveyer felt has a wet paper contact fiber layer that includes at least a meltable fiber and directly makes contact with the wet paper, and   wherein the smoothing belt includes a base body and a polyurethane layer that directly makes contact with the wet paper.   
     
     
         18 . The smoothing press apparatus of  claim 17 , wherein the wet paper conveyer felt comprises:
 a base body;   a first batt layer formed on a surface of the wet paper side of the base body;   a second batt layer formed on a surface of the roll side of the base body; and   a wet paper contact fiber layer including a meltable fiber and formed on a surface of the wet paper side of the first batt layer, the wet paper contact fiber layer to directly make making contact with the wet paper.   
     
     
         19 . The smoothing press apparatus of  claim 17 , wherein the wet paper conveyer felt comprises:
 a base body;   a first batt layer formed on a surface of the wet paper side of the base body and including the meltable fiber;   a second batt layer formed on a surface of the roll side of the base body and including the meltable fiber; and   a wet paper contact fiber layer formed on a surface of the wet paper side of the first batt layer, the wet paper contact fiber layer to directly makemaking contact with the wet paper.   
     
     
         20 . The smoothing press apparatus of  claim 17 , wherein the wet paper conveyer felt comprises:
 a base body;   a first batt layer formed on a surface of the wet paper side of the base body;   a second batt layer formed on a surface of the roll side of the base body and including the meltable fiber; and   a wet paper contact fiber layer formed on a surface of the wet paper side of the first batt layer, the wet paper contact fiber layer to directly makemaking contact with the wet paper.   
     
     
         21 . The smoothing press apparatus of  claim 17 , wherein the wet paper conveyer felt comprises:
 a base body;   a first batt layer formed on a surface of the wet paper side of the base body and including the meltable fiber;   a second batt layer formed on a surface of the roll side of the base body and including the meltable fiber; and   a wet paper contact fiber layer including the meltable fiber and formed on a surface of the wet paper side of the first batt layer, the wet paper contact fiber layer to directly makemaking contact with the wet paper.   
     
     
         22 . The smoothing press apparatus of  claim 17 , wherein the wet paper conveyer felt comprises:
 a base body;   a first batt layer formed on a surface of the wet paper side of the base body;   a second batt layer formed on a surface of the roll side of the base body; and   a wet paper contact fiber layer including the meltable fiber melted with a thermal work and formed on a surface of the wet paper side of the first batt layer so that the meltable fiber directly can make directly contact with the wet paper.   
     
     
         23 . The smoothing press apparatus of  claim 17 , wherein the fiber for forming the first batt layer, the second batt layer and the wet paper contact fiber layer containing the meltable fiber includes a meltable fiber having a weight percentage of 15 to 100 wt % and a non-meltable fiber occupying the remaining portion.