JPH0665574B2 - Thickness correction method in interleaf paper winding process - Google Patents

Description

TECHNICAL FIELD The present invention relates to a thickness correction method in a process of winding interleaving paper.

The "interleaving paper" referred to in the present specification refers to paper inserted between plates for the purpose of protecting the plate surface of a plate-shaped product such as a stainless steel plate, an aluminum plate, a plate glass, and a decorative plate. This slip sheet is strongly required to be flat without harmful projections that physically damage the plate surface of the product.

The interleaving paper, which has been made through the plowing mesh section, the pressing section and the drying section of the paper machine, is usually once wound up by a winder and then sent to a secondary process such as cutting and rewinding.

The present invention relates to a method of winding a slip sheet before it is fed to a secondary step, that is, a method of winding interleaving paper in a winder provided at the finish of a paper machine.

[Prior Art] Conventionally, in a winding machine, a shaft-type reel that rotates a winding shaft to wind a paper and a paper wound on the winding shaft contacts a surface of a rotating drum (also called a pop reel). There are surface type reels that can be wound up.

A conventional example of this surface type reel will be described with reference to FIG.

Reference numeral 1 is an interleaf paper made by a paper machine, 2 is a rotary drum, 3 is a winding shaft, 4 is a winding arm, and 5 is a pneumatic cylinder. The winding arm 4 is tiltably supported, and the pneumatic cylinder 5
Thus, the interleaving paper roll 1a on the winding shaft 3 is brought into contact with the rotary drum 2. The interleaving paper 1 is wound around the winding shaft 3 by frictional transmission due to this contact. Then, as the winding diameter of the interleaf paper roll 1a increases, the winding arm 4 tilts from the state shown by the solid line to the state shown by the chain line. During this period, the air in the rod-side chamber 5a of the pneumatic cylinder 5 is appropriately discharged and the piston-side chamber 5b is supplied with air, so that the contact pressure on the rotary drum 2 is kept substantially constant. ing.

[Problems to be Solved by the Invention] However, in the conventional winding machine, since the contact pressure is constant,
There were the following problems.

When making paper with a paper machine, the thickness of the paper is not always uniform, and thick and thin portions may occur. The reason for this is that the fibers are oriented in the longitudinal direction of the paper (the same paper traveling direction as when the paper is made by a paper machine), but unevenness occurs in the amount of orientation due to various circumstances. it is conceivable that. As a result, a thick portion extends in the longitudinal direction on the paper being wound, and unevenness called a so-called bone is observed.

When this bone is formed, the roll is wrinkled, and the wrinkles gradually become larger as the winding layers are piled up.

As described above, the interleaving paper is a protective sheet that is inserted between the sheet-shaped materials, but if the interleaving paper has irregularities in thickness, it will rather damage the sheet-shaped product, which is not preferable.

In view of such circumstances, it is an object of the present invention to provide a winding method for correcting the thickness of the slip sheet.

[Means for Solving the Problem] The thickness correcting method in the winding step of the present invention uses a step of winding the interleaving paper by bringing the interleaving paper roll body on the winding shaft into contact with the surface of the rotary drum, that is, using a pop reel. In the winding step, the contact pressure of the interleaf paper roll on the winding shaft with respect to the rotary drum is increased according to an increase in the winding diameter.

In the present invention, the increase in contact pressure includes a linear relationship with the winding diameter and a non-linear relationship with the winding diameter. Moreover, what increases linearly includes what increases continuously.

[Function] Usually, when a paper having a non-uniform thickness is wound up in multiple layers, the unevenness gradually becomes worse as the winding diameter increases. However, in the case of the present invention, as the winding diameter increases, the contact pressure increases, so that the tension applied to the interleaving paper to be wound increases. Then, as the tension increases, the interleaving paper roll body is forcibly tightened so as to even out unevenness. As a result, the thickness of the interleaf sheet is corrected, and the interleaf sheet that is sufficiently flat in practical use can be obtained.

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic diagram of a winding control device that executes a thickness correcting method in a winding step of the present invention.

Reference numeral 1 denotes an interleaving paper made by a paper machine, and only a portion which passes through the plow net portion, the press portion and the drying portion of a known paper machine and is supplied to the winder is shown.

Reference numeral 2 denotes a rotary drum, which is usually a cast iron cylinder. Then, it is connected to an appropriate prime mover and rotated in the direction of arrow a.

A winding shaft 3 is usually made of steel pipe. Then, the interleaving paper 1 is wound around the winding shaft 3 with its end fixed with a tape or the like. This wound roll is coded
Shown by 1a.

Reference numeral 4 denotes a winding arm, the upper end of which is formed in a fork shape and supports the winding shaft 3. Further, its base end is rotatably supported by a bracket 6 on the floor by a pin 6.

A pneumatic cylinder 5 has a piston rod 8 pin-connected to the winding arm 4 and a cylinder 9 pin-connected to a bracket 10 on the floor. The pneumatic cylinder 5 presses the paper 1 on the take-up shaft 3 against the rotary drum to obtain an appropriate contact pressure P.

With the above mechanical structure, the interleaving paper 1 wound around the winding shaft 3
Is brought into contact with the rotary drum 2, and frictional transmission at the time of contact causes
The interleaving paper 1 is sequentially wound on the winding shaft 3. And
As the winding progresses, the winding shaft 3 is rotated by the rotary drum 2
Although it moves away from the position close to, this movement is guided by a guide rail (not shown).

Next, the control unit will be described.

Reference numeral 11 denotes a sensor for detecting the tilt angle θ of the winding arm 4, which can be constructed by attaching a known potentiometer or the like to the pin 6. The tilt angle θ
Of course, it may be detected. Since this tilt angle θ changes according to the change of the winding diameter D on the winding shaft 3, the detected value is a variable indicating the winding diameter D. Then, the detected value θ is input to the controller 17. This controller 17
Details of will be described later.

On the other hand, an air supply line 12 is connected to the rod side compartment 5a and an air supply line 13 is connected to the piston side compartment 5b of the pneumatic cylinder 5, and each of the supply lines 12 and 13 is switched between two positions in four directions. Air is supplied and discharged through a solenoid valve 14 of the mold.

Further, the air supply line 12 has an electropneumatic converter 15 and a pressure reducing valve.
16 are installed. The electro-pneumatic converter 15 changes the air pressure on the output side according to the electric signal from the controller 17. For example, if the input pressure is 5 kgf / cm ² , 0.1-5 kgf / cm
^The one that can change the output pressure within the range of ² is used. The pressure reducing valve 16 is provided to set an upper limit value of the secondary pressure of the supply line 12.

A publicly known programmable controller or the like is preferably used as the controller 17, and FIG. 2 shows an example of a controller using a microcomputer.
The controller 17 includes a ROM that stores the cylinder output of the pneumatic cylinder 5 corresponding to an appropriate contact pressure P, a CPU, a RAM, and the like that are necessary to execute the calculation. Then, when the detection value θ of the sensor 11 is fetched from the input port, a required calculation is executed, and the electric signal E is output from the output port. Then, in the electropneumatic converter 15, the air pressure is adjusted to a pressure corresponding to the electric signal E, and the air is supplied to the rod side compartment 5a of the pneumatic cylinder 5.

As described above, if the pressure of the air supplied to the rod side compartment 5a is adjusted, the contact pressure P for pressing the paper 1 on the take-up shaft 3 against the rotary drum 2 can be adjusted, as is clear from FIG. You can do it. It should be noted that how to change the output of the pneumatic cylinder 5 in order to obtain the change in the contact pressure described below depends on the angle of the winding arm 4, the mounting direction of the pneumatic cylinder 5, the presence or absence of a guide rail, and the like. Although it depends on the configuration of the device, contact pressure P shown below for each device
It is only necessary to select a curve of the output change that obtains the above and store it in the controller 17.

Next, the control content of the contact pressure P will be described.

The thickness correcting method in the winding step of the present invention is characterized in that the contact pressure P is substantially increased as the winding diameter D is increased. These can be considered, and they are appropriately selected depending on the type of paper of the interleaving paper 1, the initial value and the final value of the winding diameter D, and further parameters such as the mechanical configuration of the winding device.

The typical pattern is illustrated below.

In the example shown in FIG. 3, in the initial region ID of the winding diameter D, the contact pressure remains constant at the initial pressure IP, linearly increases in the intermediate region MD, and again in the latter region FD at the final pressure FP. It changes constantly. That is, in this example, two break points of the output pressure P are set.

The example shown in FIG. 4 is one in which the break points in FIG. 3 are eliminated so that they change continuously.

The example shown in FIG. 5 has a linear increase from the beginning to the end of winding.

In the example shown in Fig. 6, only the initial area ID of the winding is the initial pressure IP.
, And then linearly increases until the final winding.

The example shown in FIG. 7 is the initial area ID and the intermediate area MD of the winding.
Is linearly increased, and the final pressure FP changes in the latter half FD.

In each of the above examples, the linearly changing portion may be increased non-linearly so as to draw a curve.
The break points in FIG. 7 may be changed continuously.

[Advantages of the Invention] According to the present invention, it is possible to correct the thickness of the slip sheet during winding, and to obtain a flat slip sheet. Therefore, this interleaving paper does not damage the surface of the sheet-shaped product.

[Brief description of drawings]

FIG. 1 is a schematic view of a winding control device for executing a thickness correction method in the winding step of the present invention, FIG. 2 is a block diagram showing an example of a controller, and FIGS. 3 to 7 are control of the present invention. FIG. 8 is a schematic view of a conventional winding machine, showing a winding diameter-contact pressure relationship diagram showing the contents. (Main symbols in the drawing) 1: Sheet paper 2: Rotating drum 3: Take-up shaft 4: Take-up arm 5: Pneumatic cylinder 11: Sensor 12, 13: Air supply circuit 15: Electro-pneumatic converter 17: Controller

Claims (1)

[Claims] 1. In the step of winding the interleaving paper by bringing the interleaving paper roll on the take-up shaft into contact with the surface of the rotary drum, the contact pressure of the interleaf paper roll on the take-up shaft to the rotary drum is increased. A method of correcting the thickness in the interleaving paper winding process, which is characterized by increasing the thickness according to.