JP2004169245A - Shoe press for paper-making machine and press device for paper-making machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shoe press and press device for a paper-making machine, stabilizing the conveyance of wet paper by absorbing and holding the wet paper at a discharging side of a nip of the shoe press for the paper-making machine to realize a high speed operation of the paper-making machine while suppressing a re-wetting phenomenon and reducing an equipment cost as well. <P>SOLUTION: This shoe press for the paper-making machine for squeezing water by compressing wet paper 1 with a top press roll and bottom press roll while traveling in a state of nipping the wet paper with felts 3, 5 is provided with that one of the top press roll and bottom press roll is a shoe press module 10 building the press shoe in it, and another one of the top press roll and bottom press roll is a suction roll 12 having a posture of facing a sucking part 12a toward the discharging side of nip part of the shoe press module. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a shoe press for a paper machine and a press machine for a paper machine, which are used to squeeze water from wet paper in a press section of the paper machine.
[0002]
[Prior art]
2. Description of the Related Art A paper machine is provided with a paper machine press device (hereinafter, also simply referred to as a press device) that presses and squeezes paper web (wet paper) formed in a paper layer forming section.
As a press machine, a so-called no-open draw type press machine, in which wet paper is run while being always supported by a press felt, an impermeable transfer belt, etc., with the progress of high-speed operation of the paper machine, has been developed. Proposed. There is no "open draw", that is, there is no "wet paper running in the air in a free state where nothing is supported", and the resistance to the wet paper running is received from the air is minimized Therefore, the occurrence of paper breakage can be sufficiently suppressed even during high-speed operation.
[0003]
Such a no-open draw type press device is configured, for example, as shown in FIG. This press device is a dual shoe press type device having a shoe press 201 as a first press and a shoe press 202 as a second press as shown in the figure. The wet paper web 1 formed by dehydration in the paper layer forming section is adsorbed and held on the lower surface of the top felt 3 by the suction pickup roll 2a at the outlet of the paper layer forming section, and then between the top felt 3 and the bottom felt 5 Is transported to the first shoe press 201 composed of the first shoe press module 10 and the first press roll (grooved roll) 50, and pressed by the nip of the first shoe press 201 to be squeezed.
[0004]
Next, after the wet paper web 1 is transferred to the bottom felt 5 (from a state where the wet felt web 1 is conveyed in cooperation with the two felts 3 and 5 to a state where the wet felt web 1 is conveyed alone), suction is performed. After being sucked and held on the lower surface of the top felt 4 by the pickup roll 2b, the pick-up roll 2b is sandwiched between the top felt 4 and the bottom felt 6 and is separated from the second shoe press module 11 and the second press roll (groove roll) 51. The second shoe press 202 is pressed and pressed by the nip of the second shoe press 202 to squeeze water. After being transferred to the bottom felt 6, the wet paper web 1 is adsorbed and held on the lower surface of the canvas 7 by the suction force of the suction roll 2c, and is transferred to the first dryer roll 14 by the canvas 7 to be transferred to the dryer section. The drying process is started.
[0005]
Here, as described above, the wet paper web 1 is transferred to the bottom felt 5 after passing through the nip of the first shoe press 201, and is transferred to the bottom felt 6 after passing through the nip of the second shoe press 202. However, since the transfer is unstable, the increase in the running speed of the wet paper web and, consequently, the operating speed of the paper machine has been limited. That is, the wet paper 1 that has passed through the shoe presses 201 and 202 is determined to be attached to the top felt or the bottom felt depending on the felt surface properties of the top felts 3 and 4 or the bottom felts 5 and 6, particularly the surface roughness. If the difference in the properties of the felt surface is small, the felt to which the wet paper web 1 adheres may change and the delivery to the bottom felts 5 and 6 may not be performed promptly, and high-speed operation is performed in such a situation. Therefore, there is a risk of wasting paper, and thus, an increase in operating speed has been limited.
[0006]
Therefore, for example, a press device as shown in FIG. 6 has been disclosed (see Patent Document 1). In this press device, a suction box is provided on the nip exit side (downstream in the wet paper web transfer direction) of the shoe press 201 in order to reliably transfer the wet paper web 1 and to stably transport the wet web web 1. A suction box 60 is provided on the bottom felt 5 side, and a suction box 61 is similarly provided on the bottom felt 6 side on the nip exit side of the shoe press 202. Thereby, the wet paper web 1 is adsorbed to the bottom felts 5 and 6 at the respective nip exit sides, so that the delivery can be reliably performed.
[0007]
Since the other components are the same as those of the press device shown in FIG. 5, the same reference numerals as those in FIG.
[0008]
[Patent Document 1]
U.S. Pat. No. 5,389,205 (FIG. 2)
[0009]
[Problems to be solved by the invention]
However, in the press apparatus shown in FIGS. 6 and 7, suction devices such as suction boxes 60 and 61 and suction rolls 80 a to 80 c are arranged. In the press device in FIG. Up to the devices 60 and 61, there is no binding force of the wet paper web 1 to the bottom felts 5 and 6, and there is a possibility that the same trouble as the press device of FIG. It was not.
[0010]
Therefore, the present inventors have studied a configuration as shown in FIG. 7 in the process leading to the present invention.
In the press device shown in FIG. 7, suction rolls 80b and 80c are provided instead of the suction boxes 60 and 61 on the nip exit side of each shoe press 201 and 202, and a suction roll 80a is installed on the upstream side of the shoe press 201. Thus, the wet paper web 1 can be transported stably. The other components are the same as those of the press device shown in FIG. 5, and thus the same reference numerals as those in FIG.
[0011]
However, in this arrangement, between the nip of the shoe press 201 and the suction roll 80b, the wet paper web 1 travels in a state of being narrowed to the felts 3 and 5, and similarly, the nip of the shoe press 202 and the suction roll 80c Since the wet paper web 1 travels in a state where the wet paper web 1 is narrowed by the felts 4 and 6, the water once squeezed from the wet paper web 1 in the nip is wet between the nip and the suction rolls 80b and 80c. There is a problem that the so-called re-wetting phenomenon, which returns to paper, is inevitable and the water-squeezing effect is reduced by half.
[0012]
In addition, in the press apparatus shown in FIGS. 6 and 7, there is a problem that the equipment cost is increased by a suction device such as a suction box or a suction roll. In particular, the suction roll requires a large number of suction holes formed through the thickness of the roll body to apply suction force to the wet paper web on the roll peripheral surface. The increase in cost is large.
[0013]
The present invention has been made in view of such problems, and suppresses the re-wetting phenomenon and reduces the equipment cost as compared with the conventional apparatus, while adsorbing and holding the wet paper at the nip exit side of the shoe press for a paper machine. It is therefore an object of the present invention to provide a shoe press for a paper machine and a press machine for a paper machine, which can stabilize the conveyance of a wet paper and thereby realize a high speed operation of the paper machine.
[0014]
[Means for Solving the Problems]
In order to achieve the above object, a shoe press for a paper machine of the present invention (Claim 1) is configured to allow a wet paper web formed in a paper layer forming section to run while being sandwiched between two felts from above and below. In a shoe press for a paper machine, the top press roll and the bottom press roll disposed below the traveling path of the wet paper web pressurize and squeeze water. One of the bottom press rolls is a shoe press module having a built-in pressure shoe, and the other of the top press roll and the bottom press roll has a suction position in which a suction unit faces a nip exit side with the shoe press module. It is characterized by being a roll.
[0015]
In this case, it is preferable to set the travel path of the two felts so that the two felts are separated from each other immediately downstream of the nip (claim 2). Preferably, the shoe press module is used for the top press roll.
The press machine for a paper machine of the present invention (claim 4) is provided with a plurality of shoe presses, while running the wet paper formed in the paper layer forming section while sandwiching the felt from above and below with two felts. It is a paper machine press device which squeezes water by a plurality of shoe presses, wherein at least one of the plurality of shoe presses is the shoe press according to any one of the above claims 1 to 3. Features.
[0016]
When two shoe presses are provided, for example, one of the two shoe presses may be the shoe press according to any one of the first to third aspects. 5) Both of the two shoe presses may be the shoe press according to any one of claims 1 to 3 (claim 6).
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(1) First Embodiment FIG. 1 is a schematic side view showing a configuration of a paper machine shoe press and a paper machine press device as a first embodiment of the present invention. The same reference numerals are given to the components already described as the description of the related art, and the description thereof is partially omitted.
[0018]
As shown in FIG. 1, a press machine for a paper machine of the present embodiment (hereinafter, also simply referred to as a press machine) is provided in a press section of a paper machine, and a first shoe press 101 and a second shoe press 102 are provided. This is a dual shoe press type device.
The first shoe press 101, which is a shoe press for a paper machine according to the first embodiment of the present invention, includes an upper top press roll 10 and a lower bottom which are arranged to face each other with a pass line of the wet paper web 1 therebetween. The top press roll 10 has a felt (top felt) 3 looped around it, and the bottom press roll 12 has a felt (bottom felt) 5 looped around it. Has been passed.
[0019]
Here, the top press roll 10 is configured by a shoe press module in which a pressure shoe is built in the roll body (hereinafter, the top press roll 10 is also referred to as a first shoe press module 10).
A major feature of the present invention is that the suction roll 12 serves as the counterpart of the first shoe press module 10, that is, the bottom roll in this case. The suction roll 12 has the same configuration as the suction roll arranged on the downstream side of the shoe press in the above-described conventional press device, and has a number of suction holes connected to an external suction source on the peripheral surface of the cell (roll body). Is provided. The suction portion 12a on which suction from these suction holes acts is directed to the nip exit side as shown in the figure. In addition, the travel paths of the felts 3 and 5 are set such that the felts 3 and 5 are separated from each other immediately downstream of the nip of the first shoe press 101.
[0020]
Further, the second shoe press 102 includes a top press roll 11 and a bottom press roll 13 that are arranged to face each other across the wet paper pass line, similarly to the first shoe press 101, Felts 4 and 6 are looped around the press rolls 11 and 13, respectively. Here, the top press roll 11 is constituted by a shoe press module (hereinafter, the top press roll 11 is also referred to as a second shoe press module 11), and the bottom press roll 13 is for discharging moisture dehydrated from the wet paper. The helical groove is formed by a grooved roll whose peripheral surface is cut.
[0021]
Now, the paper web (wet paper) 1 formed by dehydration in the paper layer forming section is sucked and held on the lower surface of the felt (top felt) 3 from the outlet of the paper layer forming section by the suction roll 2a. I have. Thereafter, the wet paper web 1 is sandwiched between the felt (top felt) 3 and the felt (bottom felt) 5 via the suction roll 2b, and is made up of the first shoe press module 10 and the first suction roll 12. It is transferred to the shoe press 101 and pressed by the nip between the first shoe press module 10 and the suction roll 12 to squeeze water.
[0022]
At this time, the wet paper web 1 is delivered to the bottom felt 5 at the nip exit side, and this delivery is performed stably by the suction of the suction roll 12. The wet paper web 1 is then sandwiched between the felts 4 and 6 via the suction rolls 2b, and is transferred to the second shoe press 102 composed of the second shoe press module 11 and the second press roll (groove roll) 13. After being transported and pressed by the nip between the second shoe press module 11 and the second press roll 13 to squeeze water, it is transported via the suction roll 2c to the first dryer roll 14 at the dryer section entrance to be dried. It has become.
[0023]
In the present press apparatus, the first shoe press module 10 and the second shoe press module 11 are used as top press rolls on the upper side of the transport path of the wet paper web 1 as described above from the viewpoint of preventing vibration.
[0024]
In the shoe press for a paper machine and the press for a paper machine according to the first embodiment of the present invention, the first shoe press 101 is configured using the suction roll 12 as described above. Immediately after the nip, the wet paper web 1 is adsorbed and held by the bottom felt 5, so that the running of the wet paper web 1 can be stabilized, and the high speed operation of the paper machine can be performed stably.
[0025]
In addition, the suction roll 80b and the suction box 60 immediately downstream of the first shoe press are not required as compared with the prior art shown in FIGS. 6 and 7, and the press machine for a paper machine can be made compact and inexpensive. There is.
Furthermore, immediately after the nip of the first shoe press 101, the traveling paths of the felts 3 and 5 are set so that the felts 3 and 5 are separated from each other, so that there is an advantage that the rewetting phenomenon can be suppressed.
[0026]
Further, even if the existing press device as shown in FIG. 5 is modified to add the above-mentioned suction function for holding the wet paper web at the nip exit side, the installation space of the device is limited to the current size. However, the arrangement of a new suction roll or suction box on the nip exit side of the first shoe press as in the prior art shown in FIGS. 6 and 7 described above may not be acceptable because it increases the space. However, the configuration of the press apparatus of the present embodiment is realized without increasing the space by modifying the existing press apparatus shown in FIG. 5 by replacing the bottom press roll 50 of the first shoe press 201 with a suction roll. Can be.
[0027]
The configuration of the press apparatus of the present embodiment is such that the suction function is applied to the first shoe press 101 by using the suction roll 12 as the bottom press roll of the first shoe press 101. This has the advantage that the cost can be reduced as compared with the case where a suction roll or a suction box is provided separately from the shoe press as in the conventional press device shown in FIG.
[0028]
(2) Second Embodiment FIG. 2 is a schematic side view showing a configuration of a paper machine shoe press and a paper machine press device according to a second embodiment of the present invention. The components already described in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.
[0029]
The press machine for a paper machine according to the present embodiment (hereinafter, also simply referred to as a press machine) is configured as shown in FIG. 2, and is different from the press machine according to the first embodiment in that the bottom side of the second shoe press 102 is used. In this configuration, the grooved roll 13 is replaced with the suction roll 12. That is, in the press device of the first embodiment, the first shoe press 101 is configured to include the suction roll 12, whereas in the press device of the present embodiment, the second shoe press 101 is added in addition to the first shoe press 101. The press 102 is provided with a suction roll 12 as a counterpart of the second shoe press module 11. In addition, the travel paths of the felts 4 and 6 are set such that the felts 4 and 6 are separated from each other immediately downstream of the nip of the second shoe press 102. Other configurations are the same as those of the press device of the first embodiment.
[0030]
The shoe press for a paper machine and the press machine for a paper machine according to the second embodiment of the present invention are configured as described above. Therefore, in addition to the advantages of the first embodiment, the space required for the machine is smaller than that of the conventional press machine. In the second shoe press 102, the rewetting phenomenon at the nip exit side can be suppressed without causing an increase in the equipment cost, and the wet paper 1 is adsorbed and held on the bottom felt 6 immediately after the nip. The running of the wet paper web 1 can be stabilized.
(3) Others Although the embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and can be variously modified and implemented without departing from the gist of the present invention.
[0031]
For example, in the shoe press of each of the above-described embodiments, the shoe press modules 10 and 11 are used as top press rolls and the suction roll 12 is used as a bottom press roll in any of the shoe presses 101 and 102 from the viewpoint of preventing vibration as described above. Although it is used as a press roll, conversely, as shown in FIG. 3, the shoe press module 10 is used as a bottom press roll and the suction roll 12 is used as a top press roll, or as shown in FIG. A configuration in which the modules 10 and 11 are used for a bottom press roll and the suction roll 12 is used for a top press roll is also possible. However, in this case, the wet paper web 1 is attracted and held by the top felt, so that the wet paper web 1 is stably delivered from the top felt to the second shoe press and the dryer section. It is necessary to arrange the suction roll 2b at the entrance of the second shoe press and the suction roll 2c at the entrance of the dryer section on the bottom side.
[0032]
In the first embodiment, an example in which the shoe press of the present invention is applied to the first shoe press 101 will be described. In the second embodiment, the shoe press of the present invention will be applied to the first shoe press 101 and the second shoe press 102. Has been described, but the shoe press of the present invention may be applied only to the second shoe press 102.
[0033]
【The invention's effect】
As described above in detail, according to the present invention, in a shoe press for a paper machine, a suction roll whose suction portion faces the nip exit side with a shoe press module is used as a top press roll or a bottom press roll. Therefore, it is possible to adsorb and hold the wet paper on the suction roll side felt by the suction roll at the nip exit side without providing a suction facility downstream of the paper machine shoe press as in the conventional case, and therefore, in the conventional device, On the other hand, it is possible to stabilize the conveyance of the wet paper web and to realize a high-speed operation of the papermaking machine without increasing the installation space of the apparatus and reducing the equipment cost.
[0034]
In this case, by setting the traveling path of the two felts so that the two felts are separated from the nip exit side, the rewet phenomenon on the nip exit side can be suppressed.
If the shoe press module is used for a top press roll, vibration of the top press roll and the bottom press roll can be prevented.
[Brief description of the drawings]
FIG. 1 is a schematic side view showing a configuration of a shoe press for a paper machine and a press device for a paper machine as a first embodiment of the present invention.
FIG. 2 is a schematic side view showing a configuration of a paper machine shoe press and a paper machine press device as a second embodiment of the present invention.
FIG. 3 is a schematic side view showing a configuration of a paper machine shoe press and a paper machine press device as another embodiment of the present invention.
FIG. 4 is a schematic side view showing the configuration of a paper machine shoe press and a paper machine press device as another embodiment of the present invention.
FIG. 5 is a schematic side view showing the configuration of a conventional paper machine press.
FIG. 6 is a schematic side view showing the configuration of a conventional paper machine press.
FIG. 7 is a schematic side view showing the configuration of a conventional paper machine press.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Wet paper 2a-2c Suction rolls 3-6 Felt 7 Canvas 10 No. 1 shoe press module 11 No. 2 shoe press module 12 Suction roll 12a Suction part 13 Groove roll 14 First dryer roll 101 No. 1 shoe press 102 No. 2 shoe press

Claims (6)

While running the wet paper web formed by the paper layer forming section while sandwiching the felt from above and below with two felts, a top press roll disposed above the travel path of the wet paper web and a lower press roll below the travel path In a shoe press for a paper machine, which presses and squeezes water with an arranged bottom press roll,
One of the top press roll and the bottom press roll is a shoe press module incorporating a pressure shoe,
A shoe press for a paper machine, characterized in that the other of the top press roll and the bottom press roll is a suction roll having a suction portion directed to a nip exit side with the shoe press module. The shoe press for a paper machine according to claim 1, wherein a traveling path of the two felts is set such that the two felts are separated from each other immediately downstream of the nip. The shoe press for a paper machine according to claim 1 or 2, wherein the shoe press module is used for the top press roll. A press machine for a paper machine, comprising a plurality of shoe presses, and squeezing water with the plurality of shoe presses while running the wet paper formed in the paper layer forming section while being sandwiched between two felts from above and below. So,
A press machine for a paper machine, wherein at least one of the plurality of shoe presses is the shoe press according to any one of claims 1 to 3. With two shoe presses,
The press machine for a paper machine according to claim 4, wherein one of the two shoe presses is the shoe press according to any one of the above-mentioned claims (1) to (3). With two shoe presses,
The press machine for a paper machine according to claim 4, wherein both of the two shoe presses are the shoe presses according to any one of the above-mentioned claims (1) to (3).

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