JP2549869Y2 - Paper passing machine for paper machine press part - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a paper passing device in a press part of a paper machine.

(Prior Art) Conventionally, the configuration of a paper passing section in a press part has been described as follows.
The wet paper web squeezed by the press roll 2 and the center roll 1 travels in close contact with the center roll 1 and is peeled off by the paper peeling doctor 10 as shown in the figure. In order to transfer the wet paper to the next step, the paper roll 16 is swung to the position indicated by a dashed line to open a gap for paper passing, and then the end of the wet paper is peeled off from the point G on the center roll by an air nozzle. The paper is skipped toward the next press nip A. After passing the edge, return the paper roll 16 to the solid line position.
A proper tension is given to the paper passing, and the paper is spread over the entire width to complete the paper passing operation. The passed paper is the next press bottom felt 7
After being moved to the felt side by the felt suction roll 6, it travels to the next-stage press nip portion A.

(Problems to be Solved by the Invention) However, the above-described paper passing apparatus has the following problems.

In other words, in the paper passing technology from the press center roll to the next press, since the crepe is attached to the tail that is peeled off by the paper peeling doctor, the paper is stably blown to the nip portion A while directly peeling the paper from the center roll with air. That required skill that required skill.

Also, the open draw roller determined by the paper separation point D of the center roll and the point F of the next press bottom felt is long.
% (At 1000 ^m / min), and it was necessary to increase the draw value as the papermaking speed increased. Further, the wet paper web on the next press bottom felt is liable to cause a problem of blowing due to entrainment of air from an end portion or fluttering due to wake air, and cause problems such as paper breakage or wrinkling.

The present invention has been proposed to solve the above-mentioned conventional problems.

(Means for Solving the Problems) For this reason, the present invention relates to an open draw sheet passing section of a press part section in which a stock material that has been subjected to pre-stage dewatering by a paper machine multi-stage press dewatering apparatus is transferred to a next-stage press via a felt. Is disposed so as to be in contact with the paper peeling point (D) of the center roll (1) and the nip point (B) of the transfer felt (5),
A suction transfer roll (3) having a vacuum chamber between the points (D) and (B) and capable of adjusting a gap (C) between the center roll and the transfer felt;
A doctor blade (11) having a small rake angle and sharpened so as to peel off the paper running in close contact with the center roll, and three vacuum chambers for the suction transfer roll (3) are provided. The chambers on both sides of the transfer box have a high vacuum and the middle section has a low vacuum, and a suction box (14) for guiding a bottom felt (7) below the return roll (4) of the transfer felt (5). ) Is provided as a means for solving the problem.

(Function) The transfer suction roll and transfer top felt are placed in the open draw paper passing section, and the center roll section paper peeling doctor tip is sharpened, so that the open draw roller from the center roll to the next press can be shortened, and the paper breaks. Can be prevented. Further, since the open draw is short, the tensile force of the paper can be reduced, and the quality can be improved. Further, since the doctor tip is sharp, the paper can be easily peeled off the center roll, and the crepe of the paper tail can be reduced.

(Embodiment) The present invention will be described below with reference to the embodiment of the drawings.
The figure shows a first embodiment of the present invention. As shown in the figure, a felt loop 5 including a suction transfer roll 3 is disposed after the center roll 1. The suction transfer roll 3 provided in the felt loop 5 is provided with three vacuum chambers, and each vacuum chamber can apply a vacuum value corresponding to a use. That is, when a high vacuum is applied to the first chamber, the paper from the center roll can be held near the paper separation point,
Open draw roller can be shortened (no open draw is also possible). Also, slightly wrap the transfer suction roll and the next-stage press bottom felt, and
When a high vacuum is applied to the vacuum chamber, a nip portion necessary for paper passing can be formed.
Further, the vacuum chamber between the first and third vacuum chambers is a low vacuum chamber so that a suction force can be applied to the paper so that the paper can be held against the centrifugal force. Further, the position of the suction transfer roll 3 is adjustable in the direction of the arrow, so that the nip B can be formed between the suction transfer roll 3 and the felt 7 and the gap C between the suction transfer roll 3 and the center roll 1 can be adjusted. I have. The felt loop 5 runs together with the felt 7 from the part B to the felt suction roll 6 and wraps a little on the felt suction roll 6 (shown by a solid line) or on the felt suction roll 6 (1).
It is later returned upward by the felt roll 4 (indicated by the dash-dotted line).

The paper passing method in the apparatus configured as described above will be described. The wet paper web squeezed by the center roll 1 and the press roll 2 travels in close contact with the center roll 1, and then the paper stripping doctor 10 Stripped off. At this time, as shown in FIG. 3, the rake angle θ of the doctor blade 11 of this embodiment is
Is small and sharp, so that the paper is easily peeled off from the tip of the doctor blade, and crepe (wrinkle-like shrinkage) generated on the paper is reduced. Subsequently, an air nozzle (not shown) is inserted between the paper tail 12 and the doctor blade 11, and the tail 12 of the paper passing is jumped to the nip portion B, and the tail 12 is caught by the nip portion B. That is, the paper is continuously slit at the upstream portion by a water jet or the like. Next is paper passing, but the cut tail
Blow off the tip of 12 parts toward suction transfer roll 3. As a result, only the tail 12 first enters a normal paper threading state. At this time, since the nip point formed by the third vacuum chamber of the suction transfer roll 3 and the bottom felt is close to the tip of the paper peeling doctor blade 11, the paper is short due to the draw difference between the center roll and the next press roll 8. As the paper is stretched in time, tension is generated in the paper, and the tail 12 peels off from the tip of the doctor blade. The peeling point moves in the direction opposite to the rotation direction of the center roll 1 and stabilizes at the final peeling point D. Once the paper is peeled and expanded to the full width, the absorbing effect of the high vacuum applied to the first vacuum chamber enables the paper to be always held near the paper separation point, and the paper separation state changes. Even when it occurs, the reaction to return to the original position is quick, and the paper separation is stabilized. In addition, since the open draw is short, a draw difference can be reduced (the draw can be reduced by 0.5% by applying a vacuum), and the wet paper can be transferred to the next step without being stretched more than necessary. By applying a vacuum only to the vacuum chamber and setting the drive line between B and D, it is possible to prevent a sudden tension from acting on the tail 12.

On the other hand, the paper tail 12 runs between the felt 5 and the felt 7, is transferred onto the felt 7 by the vacuum of the felt suction roll 6, and enters the next-stage press nip A. Therefore, entrainment of air from the paper edge can be prevented between the center roll and the next-stage press, and wake air can be cut. Thereafter, the paper is spread over the entire width, and a vacuum is applied to the first and second vacuum chambers to complete the paper passing.

FIG. 2 shows a second embodiment. In FIG. 2, a felt suction box 14 is provided instead of the felt suction roll 6 in FIG. The felt suction box 14 is rotatably supported around the center of curvature E at the upstream end thereof, and is configured such that the position of the downstream end thereof can be adjusted by the position adjusting device 15. Also, the paper transferred onto the felt suction box 14 is held in vacuum and transferred to the next press roll 8, so that the possibility of blowing is further reduced.

In FIG. 1, a suction felt roll 6 is provided to draw the paper toward the felt 7 side. Therefore, the roll 6 needs to be provided at a division where the felt 5 and the felt 7 are separated. For this reason, a state where there is no press between the suction felt roll 6 and the nip point A occurs.

Sakunyon felt roll 6 and press bottom roll 9
Even if they are ideally approached, they cannot be approached more than the sum of the radii of the rolls 6 and 9. In large paper machines, the rolls 6 and 9 have a diameter of more than 1 m, so that this free state is considerably long.

Blowing (lifting) easily occurs in the free portion as described in the specification, and when this occurs, it causes wrinkles and the like. The purpose of the felt suction box 14 is to provide a box-shaped suction device in order to make the length of this free state as short as possible, and to convey the sheet in a suction state as close to the nip point A as possible.

The position adjusting device (15) is for performing fine adjustment on the entry side of the nip A portion and for opening a gap with the roll when the felt 7 is replaced.

(Effects of the Invention) As described above, in the present invention, the rake angle of the doctor blade is reduced and sharpened, so that the crepe of the peeled wet tail is reduced by applying the doctor blade to the center roll surface at an acute angle, It is possible to prevent the paper from being difficult to pass. In addition, since three vacuum chambers are provided on the suction transfer roll, and the vacuum chambers on both sides are set to high vacuum, the open draw of the wet paper between the center roll and the center roll is precisely determined and stabilized by the high vacuum on the inlet side, and the outlet The high vacuum on the side can be pulled by sucking the wet paper when passing the paper, and the paper can be smoothly passed to the next roll nip. Further, since the intermediate point only prevents flyout due to centrifugal force, a low degree of vacuum is sufficient. Although there is no problem in terms of performance even if the entire region is made to be a high vacuum, energy loss is correspondingly caused.

A bottom felt is provided in contact with the lower side of the transfer felt, and the bottom felt has a function of transporting the wet paper to the roll nip point B for press dewatering. In general, when wet paper is simply placed on the bottom felt and conveyed to the roll nip, if the speed of the bottom felt is as fast as 1000 m / min or more because the wet paper is free on the upper side, running may be blurred or air In the present invention, there is a transfer felt to prevent this, and the wet paper is sandwiched between the transfer felt and the bottom felt, and stable running can be achieved. . That is, the following effects are obtained by arranging the transfer suction roll and the transfer top felt in the open draw sheet passing portion in the paper machine press part, and further sharpening the tip of the doctor blade for stripping the paper in the center roll portion. .

(1) Since the paper is peeled off by a doctor blade having a small rake angle, the paper can be easily peeled off from the center roll, and the crepe of the paper tail can be reduced.

(2) Since the open roll from the center roll to the next press is shortened (no open draw is also possible) and the paper breakage is less likely to occur, stable operation is achieved in a paper machine that goes on the road of higher speeds. .

(3) Since the open draw is short, it is possible to operate at a lower draw value and to improve the quality (the tensile strength ratio can be reduced).

(4) Since the paper passing operation is facilitated, the skill of the operator is not required.

[Brief description of the drawings]

FIG. 1 is a layout diagram of a transfer felt and each roll according to a first embodiment of the present invention, FIG. 2 is a layout diagram of a felt suction box according to a second embodiment of the present invention, and FIG. 3 is an implementation of the present invention. FIG. 4 is a detailed view of a doctor device according to an example, and FIG. 4 is an arrangement diagram of transfer felts and rolls showing a conventional paper passing method. Description of main parts in the drawing 1... Center roll, 2... Press roll, 3... Suction transfer roll, 4.
...... Transfer felt, 6 ... Suction felt roll, 7 ... Bottom felt, 8 ... Press top roll, 9 ... Press bottom roll, 10 ... Doctor device,
11… Doctor blade, 12… Tail of paper, 13… Paper after passing, 14… Felt suction box, 15… Position adjusting device, 16… Paper roll

 ──────────────────────────────────────────────────の Continuing on the front page (72) Hiroshi Masuda 5007 Itozakicho, Mihara-shi, Hiroshima Mitsubishi Heavy Industries, Ltd.Mihara Works Co., Ltd. (72) Katsuaki Suemune 5007 Itozakicho, Mihara-shi, Hiroshima Mitsubishi Heavy Industries, Ltd. (56) References JP-A-51-75102 (JP, A) JP-A-2-19589 (JP, A) JP-A-59-71495 (JP, A) JP-A-52-158102 (JP, A) , U) Jiko 61-33040 (JP, Y2)

Claims (3)

(57) [Scope of request for utility model registration] 1. A center roll (1) is peeled off in an open draw sheet passing section of a press part section in which a stock material subjected to pre-stage dewatering by a paper machine multi-stage press dewatering apparatus is transferred to a next-stage press via a felt. Point (D) and transfer felt (5)
A vacuum chamber is provided between the point (D) and the point (B), and the gap (C) between the center roll and the transfer felt can be adjusted. Paper machine press part, characterized in that a suction transfer roll (3) is provided, and a doctor blade (11) having a small rake angle and sharpened so as to peel off paper running in close contact with the center roll. Paper passing device. 2. The suction transfer roll (3).
3. The paper-passing device for a press part of a paper machine according to claim 1, wherein three vacuum chambers are provided, and the chambers on both sides thereof are set to a high vacuum and the middle is set to a low vacuum. 3. The paper machine according to claim 1, wherein a suction box (14) for guiding a bottom felt (7) is provided below the return roll (4) of the transfer felt (5). Press part paper passing device.