JPH04316698A - Method for controlling blade coater - Google Patents

Abstract

PURPOSE:To eliminate the problems such as meandering motion and breakage of paper caused by the attaching and detaching of a blade in a coating process by using a specific method for the instantaneous control of the slow-down of a backing roll caused by the pressing of a blade against the backing roll. CONSTITUTION:A pressing signal i1 is inputted to a backing roll 2 to accelerate the rotation of the backing roll immediately before pressing a blade 5 against the backing roll 2 of a blade coater. Concretely, the stationary rotational speed 3 of the backing roll 2 and the stationary rotational speed 4 of a dancer roll are inputted to an automatic speed regulator(ASR) 1 and a pressing signal i1 is transmitted from the ASR 1 to the backing roll 2 immediately before the pressing of the blade 5 against the backing roll 2 to detect the slow-down of the rotation of the backing roll 2 caused by the pressing with the blade 5 and to accelerate the rotation of the backing roll corresponding to the slow- down of the roll.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a method for controlling a blade coater in a coated paper manufacturing process, and more specifically, a method for controlling a blade coater in a coated paper manufacturing process.
This invention relates to a blade coater control method that enables smooth and stable coating work by eliminating delays in roll rotation during the papermaking process, paper sagging, roll slippage when the blade is released, etc.

0002

2. Description of the Related Art In the coated paper manufacturing process, as shown in FIG. I am working on it. Note that FIG. 3 shows a coating process consisting of four coating steps.

[0003] In the conventional coating process described above, 1. When the blade 31 is pressurized at the beginning of operation and after blade replacement (that is, when applying paint), the torque of the motor for driving the backing roll 32 increases and instantaneously Speed decreases. 2. When coating with blade pressure, the paper S stretches after the backing roll 32, so if the speed remains the same as before coating, the paper will sag and the tension of the paper will change instantaneously.

Conventionally, in order to improve the above-mentioned drawbacks, dancer rolls 34 for correcting the tension of the paper S are provided at various locations during the coating process, and fluctuations in paper tension are corrected by adjusting the dancer rolls 34.

[0005]

[Problems to be Solved by the Invention] The control method using dancer rolls corrects paper tension fluctuations after they occur, but the response is slow and is not effective against instantaneous fluctuations. do not have.

[0006]Also, attempts have been made to increase the sensitivity of the drive motor's speed control device to reduce instantaneous speed fluctuations, but this control method has its limitations because hunting occurs due to gear backlash, etc. There is.

On the other hand, when the blade 31 is released when replacing the blade, the binding force between the backing roll 32 and the paper S is lost, causing slippage, the dancer roll 34 is displaced, and even if an attempt is made to correct it, the paper is pulled by the backing roll 32. This has the drawback that the speed of the backing roll 32 increases.

As mentioned above, a control method for suppressing instantaneous tension fluctuations in the coating process or slipping of paper on the backing roll has not yet been developed, and meandering caused by blade attachment and detachment during the coating process has not yet been developed. , paper shortages, etc. have not been resolved yet.

An object of the present invention is to provide a control method that can prevent meandering and paper breakage caused by fluctuations in paper tension by predicting in advance fluctuations in paper speed caused by attachment and detachment of blades in a blade coater as described above.

0010

[Means for Solving the Problems] A first invention is a blade coater in a coated paper manufacturing process, in which a pressure signal is input to the backing roll immediately before applying pressure to the backing roll to speed up the rotation of the backing roll. This is a method for controlling a blade coater that includes correction.

[0011] The second invention is a blade coater in a coated paper manufacturing process, and immediately before applying pressure to the backing roll with the blade, a pressure signal is input to the backing roll to make a correction to speed up the rotation of the backing roll, and
This is a blade coater control method that predicts paper elongation caused by coating on a backing roll and inputs a correction signal to a pull roll or cylinder dryer in the rear part to make corrections to speed up the rotation.

[0012] Furthermore, in a blade coater in the coated paper manufacturing process, the third invention transmits a correction signal to a pull roll or a cylinder dryer in a later part in order to suppress an increase in the speed of the backing roll that occurs when the blade is released from the backing roll. In this configuration, the paper is pulled by a pull roll or cylinder roll, and paper sag and backing roll speed increase are corrected.

[0013]

[Operations] The first to third inventions are constructed as described above, and their functions will be explained in detail next. The first invention is to input a pressure signal to the backing roll and pressurize the blade immediately before pressing the blade on the backing roll.The delay in the rotation of the backing roll that occurs when the blade is pressed is changed from a preset steady state rotation speed. By detecting this and inputting a pressure signal to the backing roll just before pressurization to speed up its rotation, it is possible to instantaneously control the delay in rotation caused by pressurization of the blade.

At this time, since there is a slight time lag in the rotation of the backing roll, the actual rotation is adjusted with a timer so that it rotates slightly later than when the pressure signal is input, and the rotation of the backing roll is If the rotation speed of the backing roll continues to be accelerated, it will interfere with the rotation of the rear part, so a timer is used to adjust the rotation speed so that it returns to the originally set rotation speed after the rotation of the backing roll stabilizes.

That is, the first invention can eliminate the delay in the rotation of the backing roll due to blade pressure by correcting the delay in the rotation of the backing roll that occurs when the blade is pressurized. In addition, the time required to slightly delay the time after inputting the pressure signal to the backing roll is about 0.5 to 1.5 seconds, and the time required to speed up the rotation of the backing roll until it stabilizes after that is approximately 0.5 to 1.5 seconds. Just adjust the timer to about 4-6 seconds.

Even when the delay in rotation that occurs when pressure is applied to the backing roll is controlled instantaneously as described above, the paper stretches when the paint is applied to the paper, and the paper stretches at the rear part of the backing roll. There is a risk of paper sagging due to The second invention corrects the delay in the rotation of the backing roll in the first invention, and also removes the sagging caused by the elongation of the paper that occurs when coating the paint with the backing roll. In order to make a correction to speed up the rotation of the pull roll or cylinder dryer roll, the elongation of the paper is predicted, and the correction signal is input to the pull roll or cylinder dryer roll in the rear part to speed up the rotation and the elongation of the paper is compensated for by the rotation of the backing roll. It is faster and can eliminate paper sagging. In this case, the correction of the rotational force of the rear part is approximately 0.5 to 1.0
Paper sagging can be eliminated by speeding up the process by about %.

Furthermore, in the third invention, when the blade is released from the backing roll, the binding force of the blade is released;
Paper sag occurs due to slipping of the backing roll.
Paper sagging can be prevented by inputting a correction signal for backing roll slippage to the pull roll or cylinder dryer to speed up the rotation of the pull roll or cylinder dryer. In this case, the rotation correction amount is approximately 0.5
~1.0% is sufficient.

The various correction signals described above can be easily generated by feeding the respective detection signals to an automatic speed regulator (ASR), which conventionally performs driving speed setting and dancer roll correction. Further, the first to third inventions may be applied alone or simultaneously, and thereby eliminate the delay in response to paper tension fluctuations caused by the conventional dancer roll, and provide instantaneous adjustment control. This makes it possible to eliminate paper sagging, paper breakage, etc. in the blade coater.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows one embodiment of the present invention. Next, the present invention will be specifically explained with reference to the drawings. In FIG. 1, the steady-state rotational speed 3 of the backing roll 2 and the steady-state rotational speed 4 of the dancer roll are set in advance in the ASR 1, and the blade 5 is pressed against the backing roll 2 (that is, the paint is applied). Immediately before, a pressure signal i1 is input from the ASR 1 to the backing roll 2. Note that when the pressure signal i1 is input to the backing roll 2, there is a slight time lag in the rotation of the backing roll 2, so it is necessary to rotate the backing roll 2 with a slight delay using a timer after inputting the pressure signal i1. be.

As described above, by inputting the pressure signal i1 to the backing roll 2 to speed up the rotation of the backing roll 2, the delay in rotation that occurs when the blade 5 is momentarily applied to the backing roll 2 can be eliminated. can. In this way, after the rotation of the backing roll 2 is sped up and the rotation reaches a stable state (about 4 to 6 seconds), the rotation of the backing roll 2 can be returned to the preset steady state speed. .

The start of rotation of the backing roll 2 and the change to steady state rotation in the above should be set to ASR1 in advance, taking into consideration the paper material, type of paint, viscosity and other properties, and the pressurized state of the blade. Backing roll 2
The rotation of the backing roll 2 when pressurizing the blade 5 can be instantaneously controlled.

As described above, if the backing roll 2 is controlled instantaneously, the paper S will elongate when the paint is applied, and if this continues, sagging will occur in the rear part of the backing roll 2 due to the elongation of the paper. There is a risk that this may occur. The second invention inputs the pressure signal i1 from the ASR 1 to the backing roll 2, and also inputs the signal i2 to the pull roll (or cylinder dryer) 6 of the rear part of the backing roll 2.
By inputting , and speeding up the rotation of the pull roll 6 to take up the elongation of the paper S, it is possible to eliminate the sagging caused by the elongation of the paper.

On the other hand, from the backing roll 2 to the blade 5
When released, the binding force of the blade 5 on the backing roll 2 is removed, and the paper S sag due to the slippage of the backing roll 2. Therefore, when the blade 5 is released, slippage of the backing roll 2 is predicted from the steady state rotational speed 3 of the backing roll 2, and the correction signal i
3 to the pull roll 6 to speed up the rotation of each roll and prevent paper from sagging.

FIG. 2 shows the control electrical system. Steady state rotation speed 3 and dancer roll steady state rotation speed 4 are input to the ASR, and the ASR signal is input to the silicon rectifier (SCR). ), the motor M of the rotary roll (for example, a backing roll) is rotated, and the signal thereof is fed back to the ASR by a pulse generator (PG). The present invention provides the i1, i2 and i
3 to the ASR, it is possible to instantaneously correct delays in the backing roll due to blade pressure, sagging due to paper elongation due to paint application, and slippage of the backing roll when the blade is released.

[0025]

As described above, the present invention instantly eliminates delays in rotation of the backing roll due to blade pressure in a blade coater, sagging of paper due to elongation of paper due to paint application, and slippage of the backing roll when the blade is released. It is possible to eliminate paper breakage and paper meandering caused by complicated paper tension fluctuations.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a control electrical system.

FIG. 3 is an explanatory diagram of a blade coater.

[Explanation of symbols]

1 ASR 2 Backing roll 3 Steady state rotation speed of backing roll 4 Steady state rotation speed of dancer roll 5 Blade 6 Pull roll (or cylinder dryer) i1, i
2, i3 input signal

Claims (3)

[Claims] 1. A blade coater used in a coated paper manufacturing process, wherein immediately before applying pressure to the backing roll, a pressure signal is input to the backing roll to perform correction to speed up the rotation of the backing roll. How to control the coater. 2. In a blade coater in the coated paper manufacturing process, immediately before applying pressure to the backing roll with a blade, a pressure signal is input to the backing roll to correct the rotation of the backing roll and speed up the rotation of the backing roll. A control method for a blade coater, which comprises predicting elongation of paper caused by coating and inputting a correction signal to a pull roll or cylinder dryer in a rear part to make corrections to speed up the rotation. 3. In a blade coater in the coated paper manufacturing process, in order to suppress the speed increase of the backing roll that occurs when the blade is released from the backing roll, a correction signal is input to the pull roll or cylinder dryer in the rear part to reduce the speed of the pull roll. Alternatively, a method for controlling a blade coater, characterized in that a correction is made to speed up the rotation of a cylinder dryer.