JPH09228286A - Paper machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper machine capable of arbitrarily changing the formation of a paper layer to give the optimal formation physical properties. SOLUTION: An endless upper wire 2 and an endless lower wire 1 are disposed in an overlapped state. A lead-in-roll 7 on the side of the upper wire 2 is faced to a forming roll 3 on the side of the lower wire 1. A lap angle αbetween the upper and lower wires 2, 1 is formed at the part of the forming roll 3. The lead-in-roll 7 can be moved to change the lap angle α. Thereby, the dehydration degree of the forming roll 3 can be adjusted to control the amount of water brought into the paper layer-constituting part 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper machine in which dewatering in a plow net can be adjusted arbitrarily.

[0002]

2. Description of the Related Art There are many types of paper machines currently in use, but it is said that a fourdrinier paper machine is preferable in order to obtain high-quality paper with good formation.

In such a Fourdrinier paper machine, an outline of an example thereof is shown in FIG. 2, in which a stock b after passing through a screen is passed from a head box c onto a running lower wire a in a plowed mesh portion. The wet paper web is formed by pouring it as a uniform thin film, entangled with fibers to form a paper layer, and removing most of the water to form a wet paper web. Since 85% of water can be dehydrated, and most of the remaining water can be dehydrated by the forming box f of the upper wire e on the downstream side, the formation of the paper layer can be stabilized. .

[0004] However, recently, the moving speed of the wire is 1
Since the speed is increased to 200 to 1300 m / min, when the stock b moves on the lower wire a from the head box c to the upper wire e where the forming box f is located, The air located near the surface of the paper layer b is so-called entrained flow together with the stock b, and the entrained air is stopped by the upper wire e downstream, so that the surface of the paper layer is wavy. However, problems have been raised that seriously affect the formation of paper layers.

For this reason, a paper machine without a pre-dewatering zone is required in the mesh portion, and in recent years, a paper machine called a gap former in which upper and lower wires are arranged side by side has been developed. It is being used in place of a paper machine.

As shown in FIG. 3, an example of a conventional gap former is an endless endless roller which is wound around a forming roll 3, a suction scooter roll 4, a stretch roll 5, and a guide roll 6 which are sequentially arranged. And an endless upper wire 2 that is wound around a lead-in roll 7, a lead-out roll 8, a stretch roll 9, and a guide roll 10 which are sequentially arranged.
And the forming roll 3 and the lead-in roll 7
In a gap G between the wire 1 of the forming roll 3 and the wire 2 of the lead-in roll 7 so that they overlap each other so that a required wrap angle α is formed in the part of the forming roll 3. The head box 14 is arranged so that the paper stock can be supplied to the lower wire 1 and
The suction box 1 at a position downstream of the forming roll 3 such that the suction box 1 and the upper wire 2 face each other with an overlapping portion therebetween.
1 is provided, a forming box 12 is provided at a position downstream of the lead-in roll 7, and a paper net forming portion 13 is formed to have a mesh portion.

[0007]

However, in the case of the above gap former, the wrap angle α suitable for the paper to be finally obtained is preset and the relationship between the forming roll 3 and the lead-in roll 7 is determined and fixed. Therefore, the lap angle α cannot be changed. In the present situation where the maximum width of paper is 10 m, it is possible to obtain a good texture according to the target paper if the degree of texture can be arbitrarily changed as a future paper machine that is becoming faster and faster. become.

Therefore, according to the present invention, the wrap angle of the upper and lower wires in the forming roll section is changed according to the target paper so that the dehydration amount can be adjusted, so that the optimum physical properties are obtained. It is the one that tries to be obtained.

[0009]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a forming roll arranged at required intervals, a suction couch roll, and a lower wire sequentially wound around other required rolls, and a required interval. So that the forming roll and the lead-in roll face each other and a wrap angle is formed in the forming roll portion, with the lead-in roll, the lead-out roll, and the upper wire sequentially wound around other required rolls arranged in And a head box for supplying the paper material into a gap formed between the wire of the forming roll part and the wire of the lead-in roll part, and the downstream of the forming roll and the lead-in roll. A paper layer forming section is provided at the position, and the lead-in roll is moved to change the wrap angle. It is equipped with the lead-in roll moving device configured to have a wire cloth section formed by.

When the lead-in roll moving device is operated to displace the lead-in roll, the wrap angle of the upper and lower wires is changed, and the dehydration amount by the forming roll is adjusted based on the change, so that the moisture is brought into the paper layer forming section. As a result of the amount being adjusted, the formation of the paper layer is changed.

If a head box moving device for moving the head box is provided, the head box can be displaced to an optimum posture in accordance with the change in the gap accompanying the change in the wrap angle.

Further, by forming the suction zone of the forming roll into a plurality of divided structures, it becomes possible to perform fine dewatering adjustment.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. In a paper machine having a woven mesh portion having the same structure as shown in FIG. 3, a plurality of suction zones 3a are provided as forming rolls 3 (see FIG. A lead-in roll moving device 15 for moving the lead-in roll 7 in an arcuate locus around the axis of the forming roll 3 is used. By displacing the lead-in roll 7 by the operation of the roll moving device 15, the wrap angle α of the upper and lower wires 2, 1 in the forming roll 3 part can be changed, and further, the head box 14 is moved to an arbitrary position. A head box moving device 16 for operating the head box moving device 16 is provided.
Is adjusted to the optimum position according to the position of the lead-in roll 7.

The lead-in roll moving device 15 has its upper end attached to the upper fixed portion 18 by a hinge 17 so as to be rotatable in the left-right direction which is a direction orthogonal to the axis of the lead-in roll 7. Lead-in roll 7 at the bottom
An operation frame 20 in which the support frame 19 of FIG.
And a hydraulic cylinder 21 obliquely interposed between the fixed portion 18 and the operation frame 20, and a hydraulic cylinder 22 obliquely interposed between the operation frame 20 and the support frame 19.

Further, the head box moving device 16 is
Head box 14 left and right lower end and the base 23 therebelow
Hydraulic jack 24 interposed at a required inclination angle between
And 25, and a hydraulic jack 26 interposed between one side portion of the head box 14 and a side fixed portion 27.

The paper material is supplied from the head box 14 into the gap G formed between the wire 1 passing through the forming roll 3 part and the wire 2 passing through the lead-in roll 7 part, and the paper layer forming portion 13 is supplied with the paper material. In an operating state in which the paper layer is formed by the operation, when the formation of the paper layer is changed and, for example, it is necessary to make an adjustment to reduce the amount of water brought into the paper layer forming unit 13, The lead-in roll moving device 15 is operated to displace the lead-in roll 7 downward as shown by the chain double-dashed line, and the wrap angle α of the upper and lower wires 2, 1 in the forming roll 3 is adjusted to be large. With the displacement of the lead-in roll 7, the head box moving device 16 is actuated to displace the head box 14 as shown by the chain double-dashed line.

In this case, the lead-in roll moving device 15
When the hydraulic cylinder 21 is expanded and contracted, the operation frame 20 can be rotated in the left-right direction, and when the hydraulic cylinder 22 is expanded and contracted, the support frame 19 can be rotated in the vertical direction.
Also, the lead-in roll 7 can be moved to a position on an arcuate locus around the axial center of the suction roll 3 through the displacement of the support frame 19. The tension fluctuation of the upper wire 2 due to the displacement of the lead-in roll 7 can be absorbed by adjusting the position of the stretch roll 9.
Further, since the head box 14 can be displaced to an arbitrary posture by appropriately adjusting the expansion / contraction operation amounts of the hydraulic cylinders 24, 25, 26 in the head box moving device 16, the forming roll 3 and the lead-in roll 7 can be displaced. According to the change of the gap G between and, it is possible to stably supply the paper material from the optimum direction.

As described above, when the lead-in roll 7 is displaced to the position indicated by the chain double-dashed line to increase the wrap angle α, when the stock passes through the forming roll 3, the area corresponding to the suction zone 3a ( Since the time) is increased, the water content is adjusted to increase the dehydration amount. At this time, since the suction zone 3a of the forming roll 3 is divided into a plurality of pieces, even if the wrap angle α changes, the dehydration adjustment can be performed extremely finely. As a result, the amount of water brought into the paper layer forming unit 13 can be reduced. Therefore, by appropriately selecting the wrap angle α, it is possible to obtain the optimum physical properties of the paper layer.

Incidentally, the lead-in roll moving device 15 and the head box moving device 16 may be arbitrarily configured as shown, and the suction zone 3a of the forming roll 3 may be one chamber. Further, when the displacement amount of the lead-in roll 7 is small, that is, when the change of the gap G is small, the posture of the head box 14 does not have to be changed, and other various changes are made without departing from the scope of the present invention. Of course, it is possible to add.

[0021]

As described above, according to the paper machine of the present invention, the forming rolls, the suction couch rolls, and the lower wires sequentially wound around other required rolls arranged at the required intervals, and the lower wires arranged at the required intervals are arranged. Lead-in roll,
A lead-out roll, and an upper wire sequentially wound around other required rolls, the forming roll and the lead-in roll face each other and are arranged so as to form a wrap angle at the forming roll portion, A head box for supplying a paper material is provided in a gap formed between the wire of the forming roll unit and the wire of the lead-in roll unit, and a paper layer forming unit is provided at a downstream position of the forming roll and the lead-in roll. Provided,
Since the lead-in roll moving device for moving the lead-in roll to change the wrap angle is provided with the plow net portion, the lead-in roll is displaced by the operation of the lead-in roll moving device. The wrap angle can be changed by adjusting the wrap angle, which allows the amount of dehydration on the forming roll to be adjusted and the amount of water carried into the paper layer component to be adjusted. It is possible to obtain optimal physical properties,
Further, by adopting a configuration equipped with a head box moving device, the head box can be displaced in accordance with the change in the gap accompanying the change in the wrap angle, and an optimal posture for paper supply can be obtained. Further, by dividing the suction zone of the forming roll into a plurality of portions, it is possible to achieve an excellent effect such that dewatering adjustment can be performed extremely finely.

[Brief description of drawings]

FIG. 1 is a schematic view of a plowed mesh portion showing an embodiment of a paper machine of the present invention.

FIG. 2 is a schematic view of a cross net portion showing an example of a fourdrinier type paper machine.

FIG. 3 is a schematic diagram of a cross-net portion showing an example of a gap former that replaces a fourdrinier paper machine.

[Explanation of symbols]

 1 Lower Wire 2 Upper Wire 3 Forming Roll 3a Suction Zone 4 Suction Couch Roll 7 Lead-in Roll 8 Lead-out Roll 13 Paper Layer Component 14 Headbox 15 Lead-in Roll Moving Device 16 Headbox Moving Device G Gap α Wrap Angle

Claims (3)

[Claims] 1. A forming wire, a suction couch roll, and a lower wire sequentially wound around other required rolls arranged at required intervals, and a lead-in roll, a lead-out roll, and other required rolls arranged at required intervals. The upper wire sequentially wound around the rolls is arranged so that the forming roll and the lead-in roll face each other and a wrap angle is formed at the forming roll portion. A head box for supplying a paper material is provided in a gap formed between the roll portion and the wire, and a paper layer constituting portion is provided at a downstream position of the forming roll and the lead-in roll. Plucked mesh part equipped with a lead-in roll moving device for moving and changing the lap angle A paper machine characterized by having. 2. The paper machine according to claim 1, further comprising a head box moving device for moving the head box according to a change in the gap position due to a change in the wrap angle. 3. The paper machine according to claim 1 or 2, wherein the suction zone of the forming roll has a divided structure.