JPH0435323B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a dewatering device in a fourdrinier paper machine used to manufacture inorganic building boards, etc., and more specifically, to a dewatering device for a fourdrinier paper machine used to manufacture inorganic building boards, etc. The present invention relates to a dewatering device that suctions and dehydrates paper while transporting it on a papermaking net.

[Conventional technology]

In a conventional fourdrinier paper making machine, a paper making net 2 is placed between the front and rear roll bodies 1, 1, as shown in FIG.
The paper-making felt 3 is stretched around the outer periphery of the paper-making net 2. Slurry is supplied from the inlet side 4, and a green sheet 5 is formed and transported by the paper-making net 2. ing. The paper-made net 2 is a wire mesh made of wires. When the green sheet 5 is conveyed through the papermaking net 2, the green sheet 5 is suction-dehydrated in a suction-dehydration box 6'. This suction dehydration box 6' is depressurized by evacuation or the like, and has an elongated rectangular dehydration port 8' on a suction plate 7' on the top surface, as shown in FIG.

[Problem to be solved by the invention]

In such a conventional example, when suction dewatering is performed, the suction force causes the papermaking net 2 to move as shown in FIG.
The paper net 2 gets stuck in the dewatering port 8', and the paper net 2 is strongly pressed against the suction plate 7' and moves, causing problems such as abrasion of the surface of the suction plate 7' and problems of the paper net 2 being worn and cut. Ta.

The present invention has been made in view of the above points, and an object of the present invention is a fourdrinier paper making machine in which the paper making net moves smoothly and there is no risk of the paper making net being worn out or breaking. We provide dehydration equipment.

[Means to solve the problem]

In order to achieve the above object, the dewatering device of the fourdrinier paper machine of the present invention is equipped with a suction dewatering means that suction dehydrates the green sheet while supporting the paper making net by rolling it into contact with the paper making net.

As a means of suction dewatering while supporting the papermaking net, a cylindrical dehydration roll having a large number of dehydration holes is rolled into contact with the papermaking net to support the papermaking net, and the green sheet is suction-dehydrated from the dehydration holes of the dewatering roll. It is preferable to connect a suction pipe to the dewatering roll so as to

In addition, as a means for suction dewatering while supporting the papermaking net, a suction dehydration box with an open top surface is placed below the papermaking net, and the papermaking net is supported by a large number of balls rotatably arranged within the suction dehydration box. It is also preferable to do so.

Furthermore, for the same purpose, a suction dehydration box with an open top surface was placed below the papermaking net, and a rotary endless band that contacted the papermaking net and rotated in the same direction as the papermaking net was placed inside the suction dehydration box. The paper-made net may be supported by a rotating endless band, and a large number of dewatering holes may be provided in the rotating endless band.

Furthermore, for the same purpose, a suction dewatering box having dewatering holes on the upper surface is placed below the papermaking net, and a coating device applies a slippery material with good lubricity to the papermaking net before the papermaking net passes through the suction dewatering box. may be provided.

[Effect]

The dewatering device of the Fourdrinier paper machine constructed as described above can suction dehydrate the green sheet by moving it while supporting and in rolling contact with the paper making net.

Further, a cylindrical dehydration roll having a large number of dehydration holes is rolled into contact with the papermaking net to support the papermaking net, and a suction pipe is connected to the dehydration roll so as to suck and dewater the green sheet from the dehydration holes of the dehydration roll. The green sheet can be dehydrated by suction through the dewatering hole of the dewatering roll while moving the papermaking net in rolling contact with the dewatering roll.

Furthermore, if a suction dewatering box with an open top surface is placed below the papermaking net, and the papermaking net is supported by a large number of balls rotatably arranged within the suction dehydration box, the papermaking net is brought into contact with the balls and the papermaking net is rolled. The green sheet can be suction-dehydrated by suction from the suction-dehydration box while moving the green sheet.

Furthermore, a suction dewatering box with an open top surface is placed below the papermaking net, and a rotating endless band that contacts the papermaking net and rotates in the same direction as the papermaking net is placed inside the suction dewatering box to form a rotating endless band. When the paper net is supported by the rotating endless belt and a large number of dewatering holes are provided in the rotating endless band, the paper making net is moved together with the rotating endless band while supporting the paper making net in contact with the rotating endless band. Green sheets can be dehydrated by suction through the dehydration hole in the suction dehydration box.

Further, a suction dewatering box having a dewatering hole on the upper surface is disposed below the papermaking net, and an application device is provided for applying a lubricating material with good lubricity to the papermaking net before the papermaking net passes through the suction dehydration box.
A slippery material is applied to the paper-made net to impart lubricity to the paper-made net, so that the paper-made net can be smoothly brought into sliding contact with the suction dewatering box and moved.

〔Example〕

First, the embodiments shown in FIGS. 1 and 2 will be described. A paper-made felt 3 is laminated on a paper-made net 2,
The paper-made green sheet 5 is placed on the paper-made felt 3 and conveyed in the direction of the arrow. The paper-made net 2 is, for example, a wire mesh made of vertical and horizontal wires. A cylindrical dewatering roll 10 is placed below the papermaking net 2 to form a green sheet 5.
A plurality of dewatering rolls 10 are rotatably supported, and each dewatering roll 10 is rotatably supported.
A papermaking net 2 is connected to 0. The dewatering roll 10 may be a free roll that rotates freely or a drive roll that is driven in synchronization with the papermaking net 2. A large number of dehydration holes 8 are perforated over the entire surface of the dewatering roll 10, and suction holes 11 are perforated on the end surface of the dewatering roll 10, and a suction pipe 12 is connected to a vacuum pump or the like. It is communicated with the suction hole 11. When the papermaking net 2 is moved, the dewatering roll 10 rotates in sync with the papermaking net 2, and the papermaking net 2 is supported by the dewatering roll 10 and moves. At this time, dehydration hole 8
The green sheet 5 is suction-dehydrated. When the papermaking net 2 moves, it is supported by a rotating dewatering roll 10, and the papermaking net 2 moves smoothly with almost no wear.

Next, the embodiment shown in FIGS. 3 and 4 will be described. A suction dewatering box 6 in the shape of a flat rectangular parallelepiped with an open upper surface is arranged below the papermaking net 2. The inside of this suction dehydration box 6 is designed to be suctioned by a vacuum pump or the like. Inside the suction dehydration box 6, a large number of balls 13 made of a material such as hard ceramics are housed over the entire surface. 13 is in contact with the papermaking net 2. In this case, as the papermaking net 2 moves, the ball 13 rolls and the papermaking net 2
is supported. At this time, the green sheets 5 are sucked into the suction dehydration box 6 through the gaps between the balls 13, and the green sheets 5 are suction dehydrated. When the paper-made net 2 moves, it is supported by rolling balls 13, and the paper-made net 2 moves smoothly with almost no wear.

Next, the embodiment shown in FIG. 5 will be described. A large number of support rolls 14 are arranged in a row at a middle height position in the suction dewatering box 6.
A large number of balls 13 are placed on the net 4, and the balls 13 are brought into rolling contact with the papermaking net 2. At this time, the ball 13 is supported by the support roll 14, so that the ball 13 rotates smoothly and the papermaking net 2 moves more smoothly. Further, a passage for dehydrated water can be secured below the suction dehydration box 6.

Note that instead of the paper-made net 2 woven with vertical wires 15 and horizontal wires 16 as shown in FIG. 6a, a large number of through holes 18 are punched in the metal plate 17 as shown in FIGS. 6b and c. When a punched metal is used, the surface smoothness increases, and the papermaking net 2 can be moved more smoothly.

Next, the embodiment shown in FIGS. 7 and 8 will be described. Rotating rolls 19 are arranged at the front and rear of the suction dewatering box 6, and a rubber belt 20 is stretched between the rotating rolls 19 as an endless belt. This rubber belt 20 is exposed from the upper opening of the suction dewatering box 6 and is brought into contact with the papermaking net 2. At least one of the front and rear rotating rolls 19 is driven, and the rubber belt 20 rotates in synchronization with the speed at which the papermaking net 2 moves. The rubber belt 20 is provided with a large number of dewatering holes 8 over its entire surface, and is supported by a plurality of support rolls 21 that support the rubber belt 20 so as to be in close contact with the paper-made net 2. Thus, the rubber belt 20 moves in synchronization with the movement of the paper net 2 to support the paper net 2, and the paper net 2 moves without friction, thereby preventing the paper net 2 from being worn out. At this time, the green sheet 5 is sucked into the suction dehydration box 6 through the dehydration hole 8 of the rubber belt 20, and the green sheet 5 is suction dehydrated. At this time, the rubber belt 20 is in close contact with the papermaking net 2 and is sucked through the dehydration hole 8, so that there is almost no leakage during suction, and the suction dewatering can be carried out effectively and the water content of the green sheet 5 can be quickly reduced.

Note that the rubber belt 20 may be replaced with a crawler belt in which a plurality of synthetic resin crawler elements having dehydration holes are endlessly connected.

Next, the embodiment shown in FIG. 9 will be described. A suction dewatering box 6' similar to the conventional example is arranged below the papermaking net 2. A coating device 22 is disposed below the papermaking net 2 before the papermaking net 2 passes through the suction dewatering box 6'. Such a coating device 22 is a spray nozzle, a roll coater, or the like. The coating device 22 is adapted to apply a slippery material to the paper-made net 2. Examples of the slippery material to be applied include paraffin, grease, and bead-like fine powder. As a result, the slippery material adheres to the papermaking net 2 to which it is applied by the applicator 22, making it easier to slide against the suction dewatering box 6', and the papermaking net 2 and the suction plate 7 of the suction dewatering box 6'. ' can be prevented from being worn out.

〔Effect of the invention〕

Since the present invention is configured as described above, it has the following effects.

The apparatus according to claim 1 is provided with a suction dewatering means for sucking and dewatering the green sheet while supporting the papermaking net by being in contact with the papermaking net. It can be dewatered by suction, and when the papermaking net is moved, it does not come into close contact with the papermaking net and rub against it as in the conventional case, and the wear of the papermaking net can be prevented.

In the apparatus of claim 2, a cylindrical dehydration roll having a large number of dehydration holes is brought into contact with the papermaking net to support the papermaking net, and the dewatering roll is configured to suction and dewater the green sheet from the dehydration holes of the dehydration roll. Since the suction pipe is connected to the dewatering roll, the papermaking net can be suctioned and dewatered from the green sheet by suction from the dewatering hole of the dewatering roll while moving the papermaking net in rolling contact with the dewatering roll. Can prevent wear.

In the apparatus of claim 3, a suction dewatering box with an open top surface is disposed below the papermaking net, and the papermaking net is supported by a large number of balls rotatably arranged in the suction dehydration box, so that the balls can be easily removed. The green sheet can be suction-dehydrated by suction from a suction-dehydration box while moving the paper-making net by rolling the paper-making net into contact with the paper-making net, and wear of the paper-making net can be prevented by the ball.

In the apparatus of claim 4, a suction dewatering box with an open top surface is arranged below the papermaking net, and a rotating endless band that contacts the papermaking net and rotates in the same direction as the papermaking net is arranged in the suction dehydration box. The paper net is supported by the rotating endless band, and the rotating endless band has many dewatering holes, so the paper net is supported by the rotating endless band while being in contact with the rotating endless band. The green sheets can be moved together and suction-dehydrated in a suction-dehydration box through the dewatering holes in the rotating endless belt, and wear of the papermaking net can be prevented by the rotating endless belt.

In the apparatus of claim 5, a suction dewatering box having dewatering holes on the upper surface is arranged below the papermaking net, and a lubricating material with good lubricity is applied to the papermaking net before the papermaking net passes through the suction dehydration box. Since a coating device is provided, a slippery material is applied to the paper-made net to give it lubricity so that the paper-made net can be moved by smoothly sliding into contact with the suction dewatering box. Abrasion of the papermaking net can be prevented by applying the material.

As described above, by preventing wear of the papermaking net, suction dehydration can be performed at a high degree of vacuum, and the water content of the green sheet can be significantly reduced and the production speed can be increased.

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view of one embodiment of the present invention, and FIG.
The figure is a perspective view of the same dewatering roll as above, FIGS. 3 and 4 are perspective views and schematic sectional views of other embodiments of the same as above, FIG. Figures a, b, and c are explanatory diagrams explaining the same paper-made net as above; Figures 7 and 8 are schematic sectional views and plan views of other embodiments of the same; Figure 9 is a schematic diagram of another embodiment of the same as above; 10 is a schematic sectional view of a conventional example, and FIG. 11 is a perspective view of a conventional suction dehydration box.
Figure 2 is a sectional view explaining the drawbacks of the conventional example, in which 2 is a paper-made net, 5 is a green sheet, 6 is a suction dehydration box, 8 is a dehydration hole, 10 is a dehydration roll, 12 is a suction tube, and 13 is a ball. , 20 is a rubber belt, and 22 is a coating device.

Claims (1)

[Scope of Claims] 1. In a dewatering device for a fourdrinier paper making machine that sucks and dewaters continuously produced green sheets while placing them on a paper making net and conveying them, A dewatering device for a fourdrinier paper machine, characterized in that it is equipped with suction dewatering means for suction dewatering a green sheet. 2. In the dewatering device of a fourdrinier paper machine, which suction dehydrates green sheets that are continuously made by placing them on a paper making net while conveying them, a cylindrical dewatering roll having a large number of dehydration holes is connected to the paper making net by rotation. A dewatering device for a fourdrinier paper making machine, characterized in that a suction pipe is connected to the dewatering roll so as to support the papermaking net and suction and dewater the green sheet through the dewatering hole of the dewatering roll. 3. In the dewatering device of a fourdrinier paper making machine, which carries out suction dehydration while conveying continuously made green sheets on a paper making net, a suction dehydration box with an open top is placed below the paper making net, and suction dewatering is carried out. A dewatering device for a fourdrinier paper making machine, characterized in that a paper making net is supported by a large number of balls rotatably arranged in a box. 4 In a dewatering device for a fourdrinier paper machine that suction-dehydrates continuously produced green sheets while placing them on a paper-making net and conveying them, a suction-dehydration box with an open top is placed below the paper-making net to perform suction dewatering. A rotary endless band that contacts the paper-made net and rotates in the same direction as the paper-made net is arranged in the box, the paper-made net is supported by the rotating endless band, and a large number of dewatering holes are provided in the rotating endless band. A dewatering device for a fourdrinier paper machine, which is characterized by: 5. In a dewatering device for a fourdrinier paper making machine that carries out suction dehydration while conveying continuously made green sheets on a paper making net, a suction dewatering box having dehydration holes on the top surface is arranged below the paper making net, A dewatering device for a fourdrinier paper making machine, comprising a coating device for applying a slippery material with good lubricity to a paper making net before the paper making net passes through a suction dewatering box.