JP2006257602A - Papermaking machine and method for recovery of papermaking/conveyer belt of papermaking machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a papermaking machine recovering belt performance such as a reduced wet paper releasing performance caused by repeated use in running operation of the conveyer belt without stopping operation of the papermaking machine or properly adjusting/recovering roughness of the belt surface in operation, and to provide a method for recovering the conveyer belt by using the papermaking machine. <P>SOLUTION: The invention relates to the papermaking machine comprising a pressing machine comprising a paper making/conveying belt composed of a pair of endless belts, and a grinding machine installed on a return side of the papermaking/conveying belt to grind the wet paper contacting surface of the belt, and the machine adjusts surface flatness of the reduced wet paper releasing performance or properly adjusting roughness of the belt surface in operation by grinding the wet paper contacting surface of the papermaking/conveying belt with a grinding body. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a paper machine and a paper recycling belt recycling method. More specifically, a belt for recovering the performance of a paper transport belt whose wet paper peelability has deteriorated during operation of the paper machine, or for appropriately correcting and regenerating the surface roughness of the belt in the use state of the paper machine. The present invention relates to a paper machine provided with the above polishing apparatus, and a method for regenerating a paper transport belt using the paper machine.

  In general, a paper machine includes a wire part, a press part, and a dryer part. These wire part, press part, and dryer part are arranged along the conveyance direction of the wet paper in the order of this process. The wet paper is transported one after another to the paper transport equipment arranged in the wire part, press part, and dryer part, and the water is squeezed out by the press part (squeezed). The paper is dried on a dryer canvas which is a paper transporting tool in the dryer part. The press device disposed in the press part includes a plurality of press mechanisms disposed in series along the conveyance direction of the wet paper web.

  There are two types of press mechanisms: a roll press mold that presses a paper transport belt with wet paper sandwiched between rolls and a roll, and a shoe press mold that presses while sandwiched between a roll and a shoe. In this method, the wet paper transported in the same direction at approximately the same speed by the paper transport belt is pressed with the roll and roll or the roll and shoe together with the paper transport belt to remove moisture from the wet paper. While squeezing water, the paper transport belt made of water-absorbing felt absorbs the water.

  In particular, the shoe press type paper machine has a wider press zone in the pressurizing part (nip) of the press than a more general roll press type paper machine, which can increase the pressurization time. Excellent in water.

  The paper transport belt has different functions required for each press part used. For example, in a press device having a first press mechanism and a second press mechanism, a belt (felt) having excellent water absorption for absorbing water squeezed from wet paper on the top side and the bottom side of the first press mechanism. Is used. Further, in the press part, the paper transporting belt of the second press mechanism disposed on the downstream side in the wet paper transport direction is required to smooth the wet paper contact surface of the belt in order to smooth the wet paper surface in particular. .

  On the other hand, between the wire part and the press part, between the press mechanisms such as the first press area and the second press area of the press device, and between the press part and the dryer part, the wet paper is transported in the next process. For example, it is necessary to deliver to a dryer canvas. Therefore, especially for paper transport belts in press machines, not only the wet paper squeezing function and wet paper transport function, but also paper separation that smoothly separates the wet paper from the paper transport belt when passing wet paper to the next process. Function (wet paper peelability) is required.

Explaining the wet paper releasability: In general, a transport belt having a very high surface smoothness forms a water film with a uniform thickness between the wet paper and the belt, which strongly adheres the wet paper and the belt. Therefore, there is a tendency that paper separation becomes worse. In particular, as described above, the conveyor belt arranged on the downstream side in the conveyance direction of the press part is required to have a smoothing function, and therefore smoothing of the belt for smoothing the wet paper surface and improvement of paper separation It is a conflicting issue, and it is not easy to solve it all at once.

  For paper transport belts that improve wet paper peelability during delivery of wet paper, a hydrophobic material is applied to a part of the wet paper carrying surface (wet paper contact surface) on which wet paper is placed and transported. An arrangement is known (Patent Document 1). More specifically, this paper transport belt is made of a wetted paper placing surface and either a polymer elastic member having a wet paper web placement surface or a surface layer forming body disposed in the polymer elastic member as a hydrophobic material. Distribute the water on the paper placement surface and the water condensing portion in a dispersed manner, and destroy the water film formed between the wet paper placement surface and the wet paper to improve wet paper peelability. It is a thing.

  Also known is a transport belt having a structure in which a fibrous body is protruded from the wet paper web side surface of the paper transport belt (Patent Document 2). In this conveyor belt, moisture is held in the fibrous body protruding from the wet paper side surface by capillary action, and the wet paper sticks to the belt, but does not form a water film with strong adhesive force, so proceed to the next step. Delivery is done smoothly.

JP 2001-89990 A JP 2004-120274 A

  However, even with a conveyor belt with improved wet paper releasability in this way, paper transport belts generally used in paper machine presses are subject to wet paper contact by receiving high pressure for a long time. The surface is densified, and the water permeability is reduced and smoothed. Alternatively, the surface roughness of the belt may be corrected and regenerated as appropriate in the use of the paper machine. For example, the paper transport belt may become dirty, or the paper quality may be improved (when the wet paper surface is roughened or a bulky paper quality is required). In the former case, removing the belt whose wet paper web releasability has deteriorated due to smoothing of the wet paper web contact surface after use from the paper machine and renewing it, or replacing it with a new belt is high in cost and availability. It becomes a big factor of decline.

  In order to solve the above-described problems, the object of the present invention is to recover the performance of a belt whose wet paper peelability has been reduced by use while the conveyor belt is running without stopping the operation of the paper machine. Another object of the present invention is to provide a paper machine capable of appropriately correcting and regenerating the surface roughness of the belt in the usage state of the paper machine, and a method of regenerating the paper transport belt using such a paper machine.

That is, the present invention is a paper machine characterized by the matters described in (1) below.
(1) A press mechanism that pressurizes wet paper to squeeze water from the wet paper, and a pair of endless belt-like paper transport belts that sandwich and convey the wet paper and absorb the water squeezed from the wet paper The wet paper web contact surface of the belt at a position where the wet paper web contact surface of the running belt can be polished on the return side of at least one of the paper transport belts A paper machine provided with a polishing device having a polishing body for polishing the wet paper web contact surface in order to adjust the surface smoothness of the paper.

Furthermore, the paper machine of the present invention can be implemented in the following embodiments (2) to (5).
(2) In the paper machine configured as described in (1) above,
The polishing body is rotatably provided in the polishing apparatus, and polishes the wet paper web contact surface while rotating.
(3) In the paper machine configured as described in (1) or (2) above,
The polishing apparatus has a moving device for moving the polishing body in the width direction of at least one paper transporting belt among the paper transporting belts in parallel with the wet paper web contact surface; and Polishing the wet paper web contact surface with the polishing body while moving in the width direction by the moving device.
(4) In the paper machine configured as described in (3) above,
The movable body is movable by the moving device between a polishing operation position where the polishing body polishes the wet paper web contact surface and a retracted position separated from the wet paper web contact surface.

Further, according to the present invention, the paper transport belt can be regenerated during traveling by the method (5) below using the paper machine.
(5) The wet paper web contact surface of the paper transport belt is polished during the belt return run by the polishing device disposed on the belt return side. The surface smoothness of the wet paper web contact surface of the belt is adjusted, and / or the roughness of the belt surface is appropriately corrected and regenerated in the usage state of the paper machine.

Further, in the above method (5) for regenerating a paper transport belt, a preferred embodiment can be carried out by the following method (6) or (7).
(6) The polishing of (5) is performed by rotational polishing.
(7) The rotational polishing of (6) is performed by rotational polishing in the width direction of the paper transport belt.

  The paper machine of the present invention is equipped with a polishing device on the return side of the paper transport belt that returns from the wet paper transport end point to the wet paper transport start point, and polishes the wet paper contact surface of the belt so that the wet paper can be used. By adjusting the surface smoothness of the wet paper web contact surface of the paper transport belt with reduced paper peelability, the performance can be restored, or the surface roughness of the belt can be corrected and regenerated as appropriate in the paper machine usage. it can. As a result, the paper machine itself can recover the wet paper peelability of the paper transport belt, which has been smoothed over a long period of use and the wet paper peelability has deteriorated. The delivery of the wet paper is performed smoothly. Further, when the belt is soiled in the usage state of the paper machine, or in order to improve the paper quality, the belt surface can be roughened to remove the belt dirt, or to meet the demands for bulky paper quality.

  Also, a paper transporter with reduced wet paper peelability due to use while continuing the paper making work by polishing the wet paper contact surface without stopping the paper machine operation by placing a polishing device on the belt return side The performance of the belt can be regenerated, and the roughness of the belt surface can be appropriately corrected and regenerated in the usage situation of the paper machine. Thereby, the paper making work and the polishing work can be performed in parallel to improve the work efficiency.

  Further, in the paper machine of the present invention having the configuration of (2) above, the wet paper web contact surface of the paper transport belt is brought into contact with the wet paper web contact surface of the paper transport belt while the polishing body of the grinding device rotates, and the wet paper web contact surface is polished. The paper contact surface can be processed to a uniform surface roughness with little variation.

  Further, in the paper machine of the present invention having the configuration of (3) above, polishing is performed while moving the polishing body in the width direction of the paper transport belt and in parallel with the wet paper contact surface by a moving device incorporated in the polishing device. Since the wet paper web contact surface of the paper transport belt can be polished by the body, the wet paper web contact surface can be easily polished with the same polishing equipment from narrow paper transport belts to wide paper transport belts. be able to.

  Further, according to the paper machine configured as described in (4) above, the polishing body can be moved between the polishing operation position for polishing the wet paper web contact surface and the retracted position separated from the wet paper web contact surface by the moving device. Therefore, when making paper, the polishing body can be kept in the retracted position, and when necessary, the polishing body can be moved from the retracted position to the polishing operation position to polish the wet paper web contact surface. Thereby, it can prevent that a grinding | polishing apparatus becomes an obstacle of papermaking work at the time of papermaking. Further, when the wet paper web contact surface is polished, the wet paper web contact surface can be easily polished by simply moving the polishing device from the retracted position to the polishing operation position. Therefore, the paper transport belt can be polished efficiently.

  Further, according to the paper transporting belt recycling method of the present invention using the paper machine, the wet paper web contact surface is polished while continuing the paper making operation without stopping the paper machine operation, and the wet paper web is used by use. By adjusting the surface smoothness of the paper transporting belt with reduced peelability, the performance can be regenerated and recovered as needed, and the roughness of the belt surface can be appropriately corrected and regenerated in the usage state of the paper machine. As a result, the paper transport belt can be used without reducing the wet paper peelability during the operation of the paper machine.

  Furthermore, according to the paper transporting belt regeneration method of (6) above, the wet paper web contact surface of the paper transport belt is rotationally polished in the polishing step, so that the wet paper web contact surface is a uniform surface with little variation. It can be processed to roughness.

  According to the paper transporting belt regeneration method of the above (7), since the wet polishing paper contact surface is rotationally polished in the width direction of the paper transporting belt in the polishing step, the width from the narrow paper transporting belt is widened. The wet paper web contact surface can be easily polished up to the paper transport belt.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a plan view showing a schematic configuration of a paper machine according to the present invention, and FIG. 2 is an enlarged perspective view of a polishing apparatus which is a main part of the paper machine of FIG.

  As shown in FIGS. 1 and 2, a shoe press type paper machine 1 that is an example of a paper machine according to the present invention includes a press device 30 and a polishing device 40.

  The press device 30 is a so-called closed draw type press in which two press mechanisms including a first press mechanism 11 and a second press mechanism 12 are arranged in series along the conveyance direction (arrow A direction) of the wet paper web W. Device. In each press mechanism, the wet paper W is sandwiched between a pair of belts 10 (first press mechanism) composed of papermaking transport belts 10a and 10b and a pair of belts 20 (second press mechanism) composed of 20a and 20b. By using a closed draw type shoe press type paper machine that is conveyed in a state and pressurized, the wet paper web W can be stably conveyed at a high speed of, for example, 1200 to 1000 m / min. As a result, paper can be made with extremely high efficiency as compared with an open draw type shoe press type paper machine.

  The first press mechanism 11 includes a pair of endless belt-like paper transporting belts 10 and a first shoe 12 and a first roll 13 which are disposed to face each other so as to form a first nip (first pressurizing unit) therebetween. (First shoe press). The pair of paper transporting belts 10 are arranged so as to be looped around the plurality of rollers 31 and circulate between the first shoe 12 and the first roll 13. The first press mechanism 11 uses the first shoe 12 and the first roll 12 while sandwiching and transporting the wet paper W supplied from a wire part (not shown) as a previous process by a pair of papermaking transport belts 10. After squeezing the water, it is transferred to the second press mechanism 21 (then, the pair of paper transporting belts 10 is circulated so as to return to the original position through the respective return paths).

  Further, the second press mechanism 21 includes a pair of endless belt-like paper transporting belts 20 and a second shoe 22 and a second shoe disposed so as to face each other so as to form a second nip (second pressurizing portion) therebetween. A roll 23 (second shoe press). The pair of paper transport belts 20 are stretched over a plurality of rollers 31 and passed between the second shoe 22 and the second roll 23 in the same manner as the pair of paper transport belts 10 of the first press mechanism 11. It arrange | positions so that it may circulate. The second press mechanism 21 receives the wet paper W supplied from the first press mechanism 11 by the pair of papermaking transport belts 20 at the transport start point SP, and holds the second paper transporting belt 20 while transporting the paper. After the water is squeezed by the shoe 22 and the second roll 23, the wet paper web W is supplied to the dryer part (not shown) as the next process at the transport end point EP (then, the pair of paper transport belts 20 are connected to each other). Cycle through the return path to return to the original position).

  The polishing apparatus 40 is for polishing the wet paper web contact surface S of the paper transport belt 10 and / or 20, and in the example of FIG. 1, the roll of the paper transport belt used in the second press mechanism 21. A polishing device is disposed on the return side of the side belt 20b. Here, in the case of the papermaking transport belt 20, the return side is a path that returns from the transport end point EP of the wet paper W to the transport start point SP of the wet paper W.

  As shown in FIG. 2, the polishing apparatus 40 is fixed to the lower surfaces of a pair of guide rails 55 and a base 59 arranged in parallel with the width direction of the paper transporting belt 20 and is slidably engaged with the guide rails 55. A moving device 53 having a sliding body 57 is provided. On the support base 61 fixed to the base 59, a rotating shaft 63 having a polishing body 51 fixed at one end is rotatably supported. An endless belt 71 is wound around a driven pulley 65 fixed to the other end of the rotating shaft 63 and a driving pulley 69 of a driving motor 67. The polishing body 51 is a brush-like member in which a large number of wire-like members 73 that are abrasives are radially implanted in the boss 75. Each wire-like member 73 is made of brass, but may be made of nylon with abrasive grains instead of brass.

  As shown in FIG. 2, the base 59 is driven by a moving mechanism 77 made of a drive motor or the like and can move on the guide rail 55 in the direction of the arrow B or C. Therefore, the polishing body 51 is made of paper. It is freely movable between a polishing operation position WP facing the conveying belt 20 and a retracted position RP (indicated by a one-dot chain line) separated from the papermaking conveying belt 20. Further, when polishing the paper transport belt 20, the moving mechanism 77 reciprocates the polishing device 40 in the width direction of the paper transport belt 20.

  The rotational force of the drive motor 67 is transmitted to the polishing body 51 via the endless belt 71, and the wet paper on the paper transport belt 20 while the polishing body 51 rotates in the direction of arrow D or the opposite direction (see FIG. 1). Polishing is performed so as to contact the contact surface S and adjust the surface smoothness of the wet paper web contact surface S. That is, the polishing body 51 rotates and polishes the wet paper web contact surface S of the paper transport belt 20 over the entire surface while moving in the width direction of the paper transport belt 20.

  The polishing machine of the paper machine according to the present invention is not limited to the brush type described above, and may be of other types. For example, the milling apparatus shown in FIG. 3 may be used. FIG. 3 is a schematic side view of the milling apparatus. As shown in FIG. 3, the polishing body 51 of the milling apparatus 50 has a plurality of blades 83 implanted in the circumferential direction on the outer peripheral surface of a boss 75 that is rotationally driven by a drive motor 67. Yes. Then, the milling device 50 rotates and polishes the wet paper web contact surface S by contacting the wet paper web contact surface S of the paper transport belt 20 while rotating the blade 83. For each blade 83, for example, SKH (high speed tool steel): SK (carbon tool steel) or the like is used for JIS. Since the other parts are the same as those of the polishing apparatus 40 already described, the same parts are denoted by the same reference numerals or the corresponding reference numerals, and the description will be simplified or omitted.

  FIG. 4 is a schematic side view of a film polishing apparatus which is another type of polishing apparatus. As shown in FIG. 4, the film polishing apparatus 60 is configured such that a polishing film 91 supplied from a supply roll 85 is wound around a collection roll 89 through a backup roller 87, and the back surface of the polishing film 91 While being pressed by the backup roller 87, the wet paper web contact surface S of the paper transport belt 20 is brought into contact with the wet paper web contact surface S to be polished. The polishing film 91 is formed by fixing particles such as aluminum oxide, silicon carbide, chrome oxide, diamond, etc. as an abrasive on the surface of a belt-like base material such as polyester. Examples of such a film polishing apparatus 60 include model number SP-50 manufactured by Matsuda Seiki Co., Ltd.

  In addition, the polishing apparatus may be of any form as long as the wet paper web contact surface of the paper transport belt can be uniformly polished. For example, the surface of the endless belt-like base material is polished with gold and sand. It may be a so-called sandpaper polishing machine that runs and polishes sandpaper to which particles are fixed, a polisher that manually operates an apparatus having a rotating polishing body, and the like.

  In addition, this polishing apparatus is usually used for the purpose of roughening the contact surface of the belt with the wet paper and reducing the adhesion to the wet paper, but in the case of a belt that requires smoothness, It can be smooth. In this case, it can be smoothed by attaching an abrasive that wears the belt surface. On the other hand, a method of correcting and regenerating the belt surface roughness as appropriate in the use situation of the paper machine, that is, changing the belt surface roughness appropriately and freely, for example, by roughening the belt surface in addition to smoothness, The paper quality may be improved or the wet paper surface may be roughened or the paper quality may be increased.

  The paper transport belts 10 and 20 can be used in various forms and compositions, and an example is shown in FIG. The paper transporting belt 10; 20 shown in FIG. 5 includes a base layer 25, a butt layer 26 (first butt layer 26A and second butt layer 26B), and a wet paper contact fiber layer having a wet paper contact surface S on the surface. 27. More specifically, the first butt layer 26A is formed on the wet layer side surface of the base layer 25, the second butt layer 26B is formed on the press side surface of the base layer 25, and the wet sheet side surface of the first butt layer 26A. A wet paper contact fiber layer 27 is formed on the substrate. The base layer 25, the first butt layer 26A, the second butt layer 26B, and the wet paper web contact fiber layer 27 are intertwined and integrated by needling.

The invention relating to a method for regenerating a paper transport belt is a method of polishing a paper transport belt having reduced wet paper peelability during travel using the paper machine of the present invention equipped with a polishing device, This is a method of adjusting the surface smoothness of the contact surface.
As shown in FIG. 1, the wet paper W carried out from the wire part (not shown) and passed to the first press mechanism 11 is conveyed while being sandwiched between a pair of paper making belts 10a and 10b. The water is squeezed by being pressurized by the first shoe 12 and the first roll 13, and the squeezed water is absorbed by the paper transporting belt 10. Next, the wet paper W is transferred to the second pressing mechanism 21 and conveyed while being sandwiched between a pair of papermaking conveying belts 20a and 20b, and is pressurized by the second shoe 22 and the second roll 23. The water is further squeezed, and the squeezed water is absorbed by the paper transport belt 20. Thereafter, the wet paper W is passed to a dryer part (not shown) and dried.

  In the apparatus of FIG. 1, the wet paper web contact surface S is polished during the belt return travel by the polishing device 40 provided on the return side of the paper transport belt 20b of the second press mechanism 21, and the wet paper peelability is restored. Possible. Specifically, the polishing mechanism 51 is moved from the retracted position RP separated from the paper transporting belt 20 to the polishing operation position WP facing the paper transporting belt 20 by the moving mechanism 77 shown in FIG. Then, the polishing body 51 is rotated by the drive motor 67 in the direction of arrow D or in the opposite direction so as to come into contact with the wet paper web contact surface S of the paper transport belt 20 for polishing. An uneven surface is formed to adjust the surface smoothness. At this time, the polishing device 40 polishes the wet paper web contact surface S of the paper transport belt 20 while swinging and moving in the width direction of the paper transport belt 20, so that the entire surface of the wet paper contact surface S has a uniform surface roughness. Can be polished.

As described above, by using the paper machine of the present invention, the wet paper web contact surface S of the paper transport belt 20 is polished, thereby recovering the wet paper peel property for paper transport, which has deteriorated during use. Alternatively, since the roughness of the belt surface can be appropriately corrected and regenerated in the use situation of the paper machine, the use period of the paper transport belt 20 is significantly longer than the conventional period, and the long life of the paper transport belt 20 Can be achieved. The polishing operation of the wet paper web contact surface S of the paper transport belt 20 by the polishing apparatus 40 may be performed at regular intervals during the paper manufacturing operation or while the paper manufacturing operation is stopped, or may be performed constantly. When paper separation failure occurs at SP and / or EP (in many cases, the paper transport felt 20 at the SP causes a blowing phenomenon, or wet paper adheres to the paper transport felts 10 and 20 and does not leave the next process) When the phenomenon of paper theft occurs), the polishing operation of the polishing apparatus 40 may be started.

In the above-described embodiment, the polishing apparatus has been described as being disposed on the return side of the paper transport belt of the second press mechanism. However, the polishing apparatus may be disposed on the return side of the paper transport belt of the first press mechanism, or both. It can also be placed on the return side. However, in particular the downstream part thereof in the press mechanism of a paper machine, i.e. the roll side paper conveying belt of the second press mechanism (20b in FIG. 1) Since the wet paper smoothness is required, smoothness in the belt itself Therefore, the effect of applying the present invention having a large wet paper peelability improvement effect is great. The paper machine is not limited to a shoe press type paper machine, and may be a roll press type paper machine. Furthermore, although the press apparatus has been described as a press apparatus having a two-stage press mechanism, it may be a press apparatus having a single press mechanism or a press apparatus in which a large number of press mechanisms are arranged in series. Needless to say, also in this case, the polishing apparatus can be provided in a specific press mechanism or in all press mechanisms.

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. In addition, the material, shape, dimension, numerical value, form, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.

  The wet paper peelability of the paper transport belt can be determined by the degree of difficulty in transferring the wet paper to the next step after passing through the press roll. An apparatus for measuring wet paper peelability is shown in FIG.

In the measuring apparatus 100 of FIG. 6, a press unit 110 is configured by a pair of press rolls 112 and 113 and a pair of wet paper web transfer belts 111 sandwiched between the press rolls. The wet paper web transfer belt 111 includes a plurality of guide rolls. 115 is supported while maintaining a constant tension, and is driven by the rotation of the press rolls 112 and 113.
A suction roll 121 for delivery to the dryer part 120 is installed in the downstream part of the press part, the belt is stretched endlessly, supported by the guide roll, and driven.

  A doctor device 130 and a polishing device 140 are installed on the return side of the roll-side wet paper web transfer belt 111 in the press section. In order to reproduce the state of the belt in use (smoothing due to use), the doctor device 130 cleans the wet paper web transfer belt surface that has passed through the press roll with the shower 132, and then applies the doctor terminal 131 to the belt for smoothness. Turn into. The polishing apparatus 140 adjusts the surface smoothness by polishing the smoothed wet paper web transfer belt surface with the polishing body 141.

In the apparatus of FIG. 6, the wet paper web W is placed on the wet paper web transfer belt 111 located on the upstream side of the press unit. The wet paper W reaches the suction roll 121 after passing through the press section. Here, the wet paper W is delivered to the dryer part 120 by suction of the suction roll. The wet paper peelability is determined based on the success or failure of the transfer.
That is, the wet paper peelability improving effect is determined by whether or not the wet paper web transfer belt subjected to the polishing process places the wet paper and passes through the press section, and then is delivered to the suction roll. .

A running test of the wet paper web transfer belt was performed using the apparatus shown in FIG. 6, and the improvement effect of wet paper peelability of the wet paper web transfer belt by polishing was evaluated. The experimental conditions are as follows.

(1) Operating conditions
(1) Belt running speed: 150m / min
Pressing pressure of the press part: 40 kg / cm
Suction roll vacuum: 150mmHg

(2) Consists of used wet paper kraft pulp. Basis weight 80g / m ² , dryness 38%

(3) Polishing device
(1) Polishing device: Rotary sandpaper device
(2) Polishing body: # 100 aluminum oxide sandpaper

(4) Doctor device The doctor terminal is sand paper of # 600 aluminum oxide. While rotating the wet paper web transfer belt 10, the doctor terminal is applied to the belt surface and the state of the belt in use (smoothing by use) is determined. Reproduced

(5) Structure of press felt, physical properties, and a general structure comprising a woven fabric and a butt layer entangled and integrated with the woven fabric by a needle punch.
Basis weight: 1200g / m ²
Bat fineness: 5.6dtex
Felt density: 0.45g / cm ³

[Test 1] (Standard condition)
Using the apparatus of FIG. 6, only the doctor apparatus was used (the polishing apparatus was moved to the retracted position RP), and a wet paper web transfer belt having a wet paper web contact surface roughness Rz: 10 μm was prepared. Then, a wet paper running test was carried out to evaluate the paper separation of the belt in the suction roll. As a result, the wet paper did not move to the dryer part due to suction of the suction roll SR. This state is reproduced as a standard state of the belt smoothed by use.

[Test 2]
Using the apparatus of FIG. 6, the polishing apparatus is moved to the polishing operation position WP, and the wet paper web contact surface is polished several times in the width direction at a moving speed of 100 mm / min. The surface roughness of the wet paper web contact surface is Rz: 35 μm. A wet paper web transfer belt was prepared. Then, a wet paper running test was carried out to evaluate the paper separation of the belt in the suction roll. As a result, the wet paper was transferred to the dryer part by suction of the suction roll SR.

[Test 3]
The wet paper web contact test of the wet paper web transfer belt used in Test 2 was abraded with a doctor terminal, and the surface roughness was smoothed to Rz: 10 μm. As a result, the wet paper did not transfer to the dryer part.

[Test 4]
The wet paper web transfer belt whose surface was smoothed in Test 3 was re-polished to a roughness Rz: 35 μm with a polishing device, and a wet paper running test was performed. As a result, the wet paper moved to the dryer part.

In the press part of a paper machine, in particular, the wet paper surface of the paper transport belt is required to be smooth to smooth the wet paper surface, while the wet paper releasability when transferring the wet paper to the next process is required. It was also required to be good, and it was not easy to solve both at the same time. In addition, the smoothness of the paper transport belt is further advanced by long-term use at high pressure, and the wet paper web releasability is lowered. Therefore, maintaining good wet paper web releasability for a long time is necessary for stable operation of the paper machine. This is a very important issue.
The present invention solves this problem all at once, and by installing a polishing device on the return side of the paper transporting belt, the surface smoothness of the paper transporting belt with reduced wet paper peelability can be adjusted. .

  In addition, the present invention adjusts the surface smoothness of the paper transport belt having reduced wet paper peelability by polishing the wet paper contact surface while continuing the paper making operation without stopping the operation of the paper machine, The performance can be regenerated and recovered at any time, and the surface roughness of the belt can be corrected and regenerated as appropriate in the use of the paper machine. be able to. This eliminates the need to replace the belt and temporarily stop the paper machine, and improve the work efficiency by carrying out the paper making operation and the polishing operation in parallel.

In addition, the moving device incorporated in the polishing apparatus can polish the wet paper web contact surface of the paper transport belt with the polishing material while moving the abrasive paper in the width direction of the paper transport belt and parallel to the wet paper contact surface. Therefore, the wet paper web contact surface can be uniformly polished in the width direction, and the wet paper web contact surface can be polished by moving the polishing body from the retracted position to the polishing operation position only when necessary. There are few obstacles to papermaking work.

It is a top view which shows schematic structure of the paper machine which concerns on this invention. It is an expansion perspective view of the polisher in the paper machine of the present invention. It is a schematic side view of a milling apparatus. It is a schematic side view of a film polishing apparatus. It is a longitudinal cross-sectional view of an example of a paper transport belt. It is the schematic of the apparatus for wet paper peelability measurement of a papermaking conveyance belt.

Explanation of symbols

1 Paper machine 10 Paper transport belt (first press mechanism)
10a (Shoe press side)
10b (Roll side)
11 First Press Mechanism 12 First Shoe 13 First Roll 20 Papermaking Belt (Second Press Mechanism)
20a (Shoe press side)
20b (Roll side)
21 Second Press Mechanism 22 Second Shoe 23 Second Roll 25 Base Layer 26 Butt Layer 27 Wet Paper Contact Fiber Layer 30 Press Device 31 Roller 40 Polishing Device 40 (a) Polishing Device (Polishing Operation Position)
40 (b) Polishing device (retracted position)
50 Milling equipment (polishing equipment)
DESCRIPTION OF SYMBOLS 51 Polishing body 53 Moving apparatus 55 Guide rail 57 Sliding body 59 Base 61 Supporting base 63 Rotating shaft 65 Driven pulley 67 Drive motor 69 Driving pulley 71 Endless belt 73 Wire member 75 Boss 77 Moving mechanism 83 Blade 60 Film polishing apparatus (Polishing) apparatus)
85 Supply roll 87 Backup roller 89 Collection roll 91 Polishing film
100 Wet paper peelability measuring device
110 Wet paper transport belt
111 Press department
112 Press roll
113 press roll
115 Guide roll
120 Dryer part
121 Suction roll
130 Doctor device
131 Doctor terminal
132 shower
140 Polishing equipment
141 Polishing body S Wet paper contact surface W Wet paper WP Polishing operation position RP Retreat position EP Wet paper transport end point SP Wet paper transport start point

Claims (7)

Press consisting of a press mechanism that pressurizes wet paper and squeezes moisture from the wet paper, and a pair of endless belt-like paper transport belts that sandwich and convey the wet paper and absorb the water squeezed from the wet paper Smoothing of the wet paper web contact surface of the belt at a position where the wet paper web contact surface of the running belt can be polished on the return side of at least one paper transport belt of the apparatus and the paper transport belt. A paper machine provided with a polishing apparatus having a polishing body for polishing the wet paper web contact surface in order to adjust the properties.   The paper machine according to claim 1, wherein a polishing body is rotatably provided in the polishing apparatus and polishes the wet paper web contact surface while rotating.   The polishing apparatus has a moving device for moving the polishing body in the width direction of at least one paper transporting belt among the paper transporting belts in parallel with the wet paper web contact surface; and 3. The paper machine according to claim 1, wherein the wet paper web contact surface is polished by the polishing body while being moved in the width direction by the moving device.   4. The papermaking according to claim 3, wherein the polishing body is movable by the moving device between a polishing operation position where the wet paper web contact surface is polished and a retracted position which is separated from the wet paper web contact surface. Machine. The wet paper web contact surface of the paper transport belt is polished by a polishing device arranged on the belt return side during the belt return travel, so that the wet paper web peelability decreases due to use. A method for regenerating a paper transport belt, wherein the surface smoothness of the paper contact surface is adjusted and / or the roughness of the belt surface is appropriately corrected and regenerated in a use state of the paper machine.   6. The method for regenerating a paper transporting belt according to claim 5, wherein the polishing is performed by rotational polishing.   7. The paper transporting belt regeneration method according to claim 6, wherein the polishing is performed by rotational polishing in the width direction of the paper transporting belt.

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