JP3188115B2 - Press machine for paper machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper machine press apparatus for improving paper passing performance.

[0002]

2. Description of the Related Art The role of a press part in a papermaking process is to squeeze water by depressing a wet paper web dehydrated to a concentration of 15 to 18% in a wire part in an upstream process by inserting it into a felt or placing it on the felt and pressing it with a roll or the like. Then, the concentration is further increased to about 40 to 45% through a plurality of press stages, and is transferred to the dryer part in the next step. One example of the overall configuration of a press device in a conventional paper machine will be described with reference to FIG. 3. A wet paper 1 having a density of about 15 to 18% on which a paper layer is formed by a wire part is sucked by a suction pickup roll 2. This is called a double felt press formed by the felt, the 1P bottom felt 4, the suction roll 5, and the grooved roll 6a.
In the number press 1P, water is squeezed through the felts 3 and 4. Further, after the wet paper is held on the surface of the pickup felt 3 while being sucked by the vacuum of the suction roll 5, a second press 2P called a single felt press formed by a center roll 6 and a grooved roll 6b having smooth surfaces is used. Water is removed.

Here, the wet paper 1 is made up of a pickup felt 3
After being transferred onto the press center roll 6 having a denser surface, the third press 3P formed by the roll 6 and the third grooved roll 6c further squeezes water toward the 3P felt 7 side, and the concentration is 35 to 40. %. The wet paper web 1 attached to the surface of the center roll 6 and conveyed is scraped off by the doctor 17 and pulled by only the rotation speed difference of the roll in a situation where the wet web called an open draw is not supported. The 4P top roll 10 and the grooved roll 6 ride on the 4P bottom felt 8 which winds and runs the suction transfer roll 18.
After the water is pressed by the fourth press 4P formed by d, the water is transferred to the dryer part including the dryer roll 11 and the like in the next step.

[0004]

In the above-mentioned conventional press machine for a paper machine, a wet paper web 1 called an open draw is used.
The paper roll 9 and the 4th press 4 which travel from the position away from the center roll 6 until it comes into contact with the paper roll 9 and with the wet paper 1 riding on the 4P bottom felt 8
Between P, the wet paper web 1 was pulled only by the difference in rotation speed of the rolls, and the binding force of the wet paper web 1 running at high speed was insufficient. Therefore, when a wet paper called a tail having a paper width of about 100 mm is passed between the third press 4P and the fourth press 4P, the wet paper is easily broken due to a slight change in the tensile force because the wet paper strength is weak, Passing between the third press 3P and the fourth press 4P required a high degree of skill. Furthermore, when the full width paper is fed, there is a problem called a flapping phenomenon, that is, both ends of the wet paper are lifted from the felt, and the papermaking speed cannot be increased due to running instability due to flapping or the like. An object of the present invention is to provide a press machine for a paper machine that can prevent paper breakage, improves running performance, and enables automatic paper feeding by adopting a configuration that eliminates open draw. .

[0005]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a press part of a paper machine for sequentially passing wet paper through a No. 1 to No. 4 press nip to squeeze water .
Pick-up felt passing through the first press nip composed of
Default , a center roll and a second grooved roll.
The second press nip formed downstream of the first press nip and the pin passing through the first press nip.
Backup felt , the center roll and a third glue.
Squeezing fel, which is composed of a closed roll and passes through a third press nip located downstream of the second press nip
And the door, consists of top roll and the fourth groove Dror
And a second bottom felt passing through a fourth press nip located downstream of the third press nip,
The running route of the felt for water squeezing is referred to as the center roll.
After passing through the gap between the third grooved roll and the wet paper, the paper is once separated from the wet paper and the center roll, and passed again through the dewatering means between the center roll and the roll rotating in contact with the center roll. A path that travels across the wet paper together with the second bottom felt that is wound around a suction transfer roll that rotates in contact with the roll, and that separates from the wet paper in front of the fourth press nip portion This is a means for solving the problem.

[0006]

According to the present invention, water is passed through the third press nip.
Second bottom passing through the felt and the 4th press nip
Since the wet paper is sandwiched between the felts and transferred to the next press nip, the wet web runability (Runability) during high-speed papermaking is greatly improved, the number of paper breaks during high-speed papermaking operation is reduced,
Productivity is improved. The third moisture in the felt for squeezing water which was increased by squeezing water in the press 3P, the fourth Puresuni'
Before sandwiching the wet paper between the second bottom felt passing up, since the removed by vacuum suction the water from the dewatering felts surface by dehydration unit, it is squeezed water exploitation
The wet (rewetting) phenomenon that flows backward from the water felt to the wet paper can be controlled, and the wet paper dryness does not decrease.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a first embodiment of the present invention. This first embodiment is different from the conventional press roll arrangement shown in FIG.
The P felt 7 is once separated from the center roll 6 and the wet paper 1, and after removing moisture from the felt 7, the P felt 7 is brought into contact with the wet paper 1 again. There is a great feature in transferring the wet paper web 1 to the fourth press nip. Concentration 15- formed in wire part
The wet paper 1 of about 18% is vacuum-sucked by the suction pickup roll 2, adhered to the surface of the pickup felt 3 and carried, and formed by the felt 3, the 1P bottom felt 4, the suction roll 5, and the group roll 6a. In a first press 1P called a double felt press, water is squeezed through felts 3 and 4.

Next, while the suction roll 5 is being sucked by the vacuum, the wet paper web 1 is held on the surface of the pick-up felt 3 and then called a single felt press formed by a center roll 6 and a grooved roll 6b having smooth surfaces. Water is pressed by the second press 2P. Further, the wet paper web 1 squeezed by the second press 2P is transferred to a press center roll 6 having a surface denser than that of the pickup felt 3, and separated from the pickup felt 3. On the other hand, the wet paper web 1 adhered to the center roll 6 is subjected to a 3P felt 7 by a third press 3P formed by the roll 6 and the third grooved roll 6c.
Water is squeezed to the side. The wet paper web 1 squeezed and adheres to the surface of the center roll 6 and moves as it is, but the 3P felt 7 is provided so as to separate from the center roll 6 and the wet paper web 1 after the 3P nip and come into contact with the surface of the felt 7. The water pressed by the third press 3P is removed from the felt surface by vacuum suction in the provided yule box 12.

The 3P felt 7 from which water has been removed is rolled (for example, a suction roll or a grub roll) 13
After contact with the wet paper web 1 again at the nip portion of the center roll 6
The wet paper web 1 is further separated, and the wet paper web 1 is wound around a suction transfer roll 18 and runs on a 4P bottom felt 8.
It runs between the 3P felt 7 and. Also, the 3P felt 7 separates immediately before the next press nip 4P from the wet paper web 1 sandwiched between the two felts 7, 8, and the wet paper web 1 is further squeezed by the 4P nip of the single felt press. 4
Wet paper 1 squeezed with a P single felt press is 4P
After adhering to the top roll 10 and running, the suction roll 14 sucks the vacuum again onto the transfer felt 15, is sandwiched between the transfer canvas 16, and is transferred to the dryer part which is the next drying step.

FIG. 2 shows that the wet paper web 1 shown in FIG. 1 does not entrain between the first press 1P and the second press 2P running along with the felt 3, and the wet paper web 1 squeezed by the first press 1P is suctioned. This shows a second embodiment of the press roll arrangement of the type in which water is squeezed between the roll 5 and the center roll 6. In the arrangement of the press rolls of the second embodiment, there is no difference from the first embodiment after the third press 3P.
The roll 13 is also shown in FIG.
It is sufficient that the wet paper 1 can be peeled off together with the P felt 7, and a grooved roll, a solid roll, or the like may be used.

[0011]

As has been described above in detail According to the present invention, the third
Pressing felt and No. 4 Presni through the Presnip
The wet paper web is transported to the next press nip with the wet paper sandwiched between the second bottom felts passing through the nip.
)), the number of paper breaks during high-speed papermaking operation is reduced and productivity is improved. In addition, from the viewpoint of productivity improvement, technical development for each part of the paper machine is being advanced to cope with high speed, and the limitation of increasing the paper making speed is becoming one of the main factors mainly due to paper breakage in the press part. .
In other words, the paper passing from the center roll to the next No. 4 press 4P or the dryer part has been a bottleneck. However, in the present invention, the wet paper web is separated from the center roll by the suction roll and immediately after the wet paper web is peeled off and sandwiched between two felts. By
Driving performance is greatly improved, and it becomes possible to make the operator less skilled in paper passing and automatic paper passing.

[Brief description of the drawings]

FIG. 1 is a flow chart of a wet paper web in a press machine of a paper machine according to a first embodiment of the present invention.

FIG. 2 is a flow chart of wet paper in a press machine of a paper machine according to a second embodiment of the present invention.

FIG. 3 is a flow chart of wet paper showing an example of a conventional press machine of a paper machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wet paper 2 Suction pick-up roll 3 Pick-up felt 4 1P bottom felt 5 Suction roll 6 Center roll 6a, 6b, 6c, 6d Groove roll 7 3P felt 8 4P bottom felt 9 Paper roll 10 Top roll 11 Dryer roll 12 Yule box 13 roll 14 Suction roll 15 Transfer felt 16 Dryer canvas 17 Doctor 18 Suction transfer roll 19,20 Felt roll

Claims (1)

(57) [Claims] 1. A press part of a paper machine for sequentially passing wet paper through a first to fourth press nip to squeeze water, comprising a suction roll and a first grooved roll.
Pickup Fell passing through the No. 1 press nip to be
And a first bottom felt , a center roll and a second grooved roll, the second press nip located downstream of the first press nip, and the pick-up passing through the first press nip.
And a center roll and a third grooved roll.
A fourth press, which is composed of a water-sucking felt that passes through a third press nip located downstream of the second press nip, a top roll and a fourth grooved roll, and that is located downstream of the third press nip. comprising a second bottom felt passing through the nip, and a travel route of felt for the dewatering, the center
After passing between the roll and the third grooved roll together with the wet paper, the paper is once separated from the wet paper and the center roll, and the roll between the center roll and the roll rotating again through the dewatering means. And the second bottom felt, which is wound around a suction transfer roll that rotates in contact with the roll, travels with the wet paper sandwiched therebetween, and in front of the fourth press nip portion. A press machine for a paper machine, wherein the press machine is configured to be separated from the wet paper web.