JPH01139890A - Press apparatus of papermaking machine - Google Patents

Abstract

PURPOSE: To obtain paper that has reduced difference in the surface smoothness and strength between the front face and the back face by arranging the first through third presses, the transfer belt, the groove roller and the counter roller to the specific positions. CONSTITUTION: When passing through a nipping part of a first press 1P, a web 2 is dehydrated via a felt 5 to both sides of the web 2. In a second press 2P, the web is nipped by a counter roller 22 and dehydrated by a groove roller 7b toward the front side. The web is accompanied by a transfer belt 21 having the smooth surface to pass via a hard roller 8 of high hardness surface and is reversed with a third press 3P and then dehydrated on the back side on the contrary of the dehydration side of the second press 2P.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a paper machine press device that can be used as a means for arranging dewatering rolls in a high-speed paper machine.

(Prior Art) Conventionally, presses without open draw (unsupported tension section) have been put into practical use in high-speed paper machines. Here, three examples of conventional configurations of the press will be explained with reference to FIGS. 4, 5, and 6.

First, as shown in FIG. 4, the paper web 2 formed into a wet paper by the wire part 1 is sucked by the pickup roll 4, transferred to the pickup felt 3, and transported to the felt 5.
When passing through the nip of the first press IP formed by the saxilan roll 6 and the group roll 7a, the double felt part made of Dehydrated.

Further, a second press 2P of the single felt is carried and formed by the hard roll 8 and the group roll 7b, and a third press 3P of the single felt is formed by the hard roll 8 and the group roll 7c, respectively, to form the front side 1.
It is dehydrated on the same side as the front side, passes through an open drying section 10, and is dried in a dryer 9. In this way, the paper web 2 is dehydrated on the front side in the first press IP and on the back side in the second press 2P, and on the front side in the third press 3P.

Next, to explain the case shown in FIG. 5, in the same manner as explained in FIG. The second press 2P and the third press 3P are single felt group rolls 7b and 7c.
Therefore, water is dehydrated from the back side to the back side, respectively.

In both FIGS. 4 and 5, the paper web 2 is dehydrated on the same side in the second press and the third press, so that differences in surface strength, smoothness, etc. occur between the front and back sides. FIG. 6 shows a fourth brace 4P installed to prevent this. As shown in FIG. The 2nd and 3rd presses are the same as the example in FIG. 3rd press 3P dehydrates the front side → the same side as the front side, and 4th press 4P dehydrates the opposite side.

(Problems to be Solved by the Invention) In a conventional press device of this type, the first to third presses
When a press is provided, as mentioned above, water is often removed from one side of the paper, and there are problems such as differences in surface strength, smoothness, etc. between the front and back sides.

In addition, if all the stages from the first press to the fourth press are used as shown in Figure 6, the bulk (thickness) of the paper may decrease, and the difference between the front and back sides cannot be completely eliminated, and the drive and vacuum There were problems such as increased operating costs due to the electricity costs, felt cleaning, replacement costs, and other maintenance costs. Furthermore, if the third press is bypassed (not used) to control the bulk (thickness) of the paper web, the open draw will essentially come after the second press, resulting in poor high-speed operation. There were other drawbacks.

The present invention was proposed to solve these problems.

(Means for solving the problem) For this reason, the present invention involves transporting a paper web attached to felt,
In a paper machine press device, in which a first press, a second press, and a third press are sequentially arranged on the same transfer path to dewater the front side and the back side, a transfer surface with a smooth surface is placed on the opposite side of the felt in the second press. In addition to providing a belt, a mating roll is provided that contacts the group roll on the felt side via the belt, and in the next third press, the paper web is transferred with the side to be dewatered reversed. This is a means to solve problems.

(Function) When the paper passes through the nip section of the first press, water is dehydrated on both sides of the paper web through the felt, and in the second press, it is nipped by a mating roll and dehydrated on the front side by the group roll. The paper web follows the transfer belt, which has a smoother surface than the felt, and the paper web follows the roll, which is harder than the soft transfer belt, and is reversed in the third press so that it is on the back side opposite to the dewatering side of the second press. Dehydrated.

(Embodiments) The present invention will be described below with reference to embodiments of the drawings. FIGS. 1 to 3 show embodiments of the present invention.

First, a first embodiment will be described with reference to FIG.

In addition, in FIGS. 1 to 3, the same parts as in the conventional FIGS. 4 to 5 are indicated by the same reference numerals. In the figure, a pink up roll 4 is in contact with a wire belt 23 of a wire part 1 via a pickup felt 3.

Further, it is held by a plurality of felt rolls 24 and the like to form a continuous ring. Inside the felt 3 facing the felt 5, a suction roll 6 of the first press IP, followed by a group roll 7b of the second press 2P are arranged, and the rotation of the rolls causes the felt 3.5 to move in the direction of the arrow. linked to direction.

Further, below the suction roll 6 of the first press IP,
There is a group roll 7a through the ring-shaped felt 5,
A nip portion is formed opposite to the suction roll 6. Further, below the group roll 7b of the second press 2P, a mating roll 2 is connected via an annular transfer belt 21.
2, and forms a nip portion facing the group roll 7b. The transfer belt 21 has a smooth surface, and can be made by coating the surface of a fabricator with polyurethane.
As another example, a dense felt with a scratched surface may be used, and is interlocked with the rotation of the mating roll 22 in the direction of the arrow.

Further, the inner transfer roll 26 is in light contact with the hard roll 8 via a belt. As in the conventional case, the group roll 7c faces the hard roll 8 via the felt 27 to form a nip portion, thereby forming the third press 3P.

Now, in the press device with the above configuration, wire part 1
The paper web 2 is sucked by the pick-and-roll 4, transferred to the pick-up felt 3, and carried through the porous felt when passing through the nip of the first press IP.
The suction roll 6 dehydrates the front side as shown by the arrow, and the group roll 7a dehydrates the back side.

Further, in the second press 2P, the material is nipped by the mating roll 22, and dehydrated to the front side by the group roll 7b. The paper web 2 follows the transfer belt 21 which is denser than the pink up felt 3, but the paper web 2 also has the characteristic of following a hard roll rather than a soft transfer belt or dense felt, and is transferred by the transfer roll 26. The image is transferred to a hard roll 8 by applying a light nip as necessary. Further, in the third press 3P, water is dehydrated on the back side using a group roll 7c.

With this series of configurations and operations, the side of the paper web 2 to be dewatered is reversed between the second press 2P and the third press 3P, and the first press IP is operated from both the front side and the back side of the second press 2.
In P, it is the front side, and in the third press 3P, it is the back side, and average dehydration is possible in the first press IP to the third press 3P without the fourth press 4P.

Next, a second embodiment of the apparatus of the present invention will be explained with reference to FIG. 2.The embodiment shown in FIG. The pick-up felt 3 from the suction roll 6 of the 1-press IP is bent upward, a group roll 7b is arranged above the roll, and a mating roll 22, a transfer belt 21, etc. are arranged on the side of the roll 7b. second
A press 2P is formed. The rest is almost the same as the first embodiment shown in FIG. 1, and the operation is also the same.
In the second press 2P, it is the front side, and in the third press 3P, it is the back side.

Next, a third embodiment of the present invention will be explained with reference to FIG. 3. This third embodiment is configured and arranged with the top and bottom of the first embodiment shown in FIG. Similarly, the side of the paper web 2 to be dehydrated is the front side and back side in the first press IP, the back side in the second press 2P, and the front side in the third press 3P. Press 3P
Although the results are reversed, there is no difference in effect. It should be noted that the present invention is not limited only to the above embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

(Effects of the Invention) As explained in detail above, according to the arrangement of the paper machine press device of the present invention, there is no open draw from the first press to the exit side of the third press, and high-speed operation is possible.
In addition, in the second and third presses, the felt is brought into contact with the opposite side of the paper and dehydrated, so there is little difference in smoothness and surface strength between the two sides, and control is easy, and there is no need to install a fourth press. Since it can also be pressed by the first to third presses, the bulk (thickness) of the gi can be maintained to the maximum. In addition, since the linear pressure in the second press is not high, the transfer belt does not need to be replaced regularly and can be used for a long period of time just like rolls.Moreover, as mentioned above, only the third press is required, so equipment costs are reduced. It has great practical effects, such as reduced electricity costs for driving and vacuum, energy savings, and lower maintenance costs.

[Brief explanation of the drawing]

1, 2, and 3 are side views showing the roll arrangement structure of the paper machine press device in the first, second, and third embodiments of the present invention, and FIGS. 4, 5, and 6 respectively. The figures are side views showing three examples of roll arrangement structures of a conventional paper machine press device. Explanation of the main parts of the diagram IP... 1st press 2P - - 2nd press 3P - 3rd press 2... Paper web 3 -
-Pickup felt 4-・Pickup roll 5-・-Felt 6-・
・Suction rolls 7a, 7b, 7c, 7d --Group roll 8
・-hard roll

Claims (1)

[Claims] A paper machine press device comprising a first press, a second press, and a third press, which transport the paper web attached to felt and dehydrate the front side and the back side on the same transfer path, a second press, and a third press, wherein the second press A transfer belt with a smooth surface is provided on the opposite side of the felt, and a mating roll is provided that contacts the group roll on the felt side through the belt, and in the next third press, the side of the paper web to be dehydrated is reversed. A paper machine press device characterized in that the paper machine press device is adapted to be transferred by moving the paper machine.