JP3685582B2 - Coating amount profile control method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a control method of a coating amount automatic adjusting device for controlling a coating amount profile of a web in a blade coater.
[0002]
[Prior art]
As shown in FIG. 1, the blade coater is coated with the coating solution 5 blown from the applicator unit 1 on the web 2 continuously running on the backing roll 3, and the coated coating solution is required by the pressing pressure of the blade 4. It is a device that adjusts the amount of coating to a coating amount and is used in a relatively high speed range where productivity is emphasized. The line speed is operated at 1000 m / min or more, and recently it is operated at 1500 m / min or more. There are also places.
[0003]
Conventionally, when adjusting the coating amount profile of the web, the operator manually pushes and pulls the profile adjustment screw by an amount corresponding to the coating amount profile after viewing the profile screen of the BM meter on the coater unit. However, it was not easy to adjust the profile in the coater head of 5 m or more in the width direction, and it took time and labor.
[0004]
[Problems to be solved by the invention]
Recently, a coating amount profile automatic control device that adjusts the coating amount profile in conjunction with the BM meter has been developed. However, the stability of the coating amount in the interlock control of the BM meter, moisture meter, latex meter, etc. There are still insufficient points.
As control methods for stabilizing the coating amount, methods such as JP-A-7-265774, JP-A-8-207121, and JP-A-8-299881 have been devised, but all of them easily reflect fine profile variations. It is necessary to suppress variations.
In particular, with respect to the profile of the edge portion of the web, it is difficult to correct the coating amount simply by moving the adjustment block corresponding to the edge portion. Sometimes, in the case of interlocking control with the BM meter, the adjustment block is excessively pushed. This causes drawing and causes loss of paper such as uneven coating and streaks.
[0007]
[Means for Solving the Problems]
The present invention provides a drive motor in which a push-pull of a coating amount adjustment block is connected to an adjustment block in response to a coating amount signal sent from a BM meter as an adjustment means for a width direction coating amount profile of a blade coater. In the apparatus that automatically controls the coating amount in the web width direction by interlocking the webs, as a method of controlling the coating amount of the edge portion of the web, a portion that protrudes outside the web on the basis of one adjustment block corresponding to the edge portion This is a coating amount control method for adjusting the coating amount of the edge portion by pushing and pulling the block corresponding to.
[0009]
[Action]
When using the coated amount profile control device in a blade coater, and Tsu Do facilitates application amount control of the web edge.
[0010]
【Example】
The present invention will be described in more detail with reference to examples.
[0011]
Example 1
In the blade coater, the coating amount adjustment block 6 is located on the opposite side of the backing roll 3 through the web 2, and the interval between the adjustment blocks is generally 5 to 10 cm. In the present invention, the interval is 5 cm. I used something. Further, the stroke of pushing and pulling the adjustment block is generally within 5 cm in the front and rear, but there is also a device having a large stroke of about 10 cm in the front and rear.
[0012]
The blade coater has a line speed of 1000 m / min or more in the bevel coating method and 600 m / min or more in the vent coating method, but recently, the speed has increased and the bevel coating method has a speed of 1500 m / min or more. The operation case is not uncommon. The present invention is not particularly limited to speed, coating method, coating amount, and coating liquid property, and can be used in any case.
[0013]
In the present invention, the BM meter 7 is used as the measurement system, but any on-line instrumentation device that can measure the application amount in the width direction of the web at a constant interval such as a moisture meter and a latex meter can be used without any problem.
[0014]
The application amount measurement signal from the BM meter is transmitted to the control computer. In this case, generally, when an existing BM meter is used, a signal subjected to smoothing processing is transmitted as shown in Equation 1. In the present invention, the data not applied with the smoothing coefficient, that is, the value in the case of SF = 1 in the formula is used. However, there is no problem even if the data obtained by processing the smoothing coefficient with an arbitrary value is used.
[0015]
[Expression 1]
d2 = SF * d2old + (SF-1) * d1
d2old: coating amount before smoothing processing d2: coating amount after smoothing processing d1: coating amount after smoothing processing one time before the present SF: smoothing coefficient
The application amount data fetched into the control computer is obtained by calculating the difference with respect to a certain target application amount (setting value) by Equation 2, and the push-pull amount of the corresponding adjustment block is again obtained by Equation 3, and the measurement position. The operation amount is transmitted to a drive motor that moves each of the adjustment blocks corresponding to , and the application amount is adjusted at a constant cycle.
[0017]
[Expression 2]
dCDn = dPVn−dSVn
dPV: Current coating amount dSV: Target coating amount (set value)
dCD: difference value of coating amount n: arbitrary
[Equation 3]
Ln = A * dCDn + B
dCD: coating amount difference value L: adjustment block movement amount A: coefficient B: coefficient n: arbitrary
The central part of the web is controlled by the above method. Unlike the control of the central part, the control of the coating amount of the edge of the web is adjacent to one adjustment block corresponding to the BM meter or the corresponding adjustment block. Adjustment is difficult only by pushing and pulling the block. Therefore, the push / pull amount of the block to the outside of the adjustment block corresponding to the web edge by 3 blocks is obtained from Equation 4 and the adjustment block is actually moved.
[0020]
There is no problem even if the movement amount to the outside of the three blocks is the same as the adjustment block corresponding to the edge portion, but there is no problem even if it is multiplied by a certain coefficient. In the present invention, the operation amount is the same as that of the adjustment block corresponding to the edge portion without being multiplied by a coefficient.
[0021]
[Expression 4]
Le = A * dCDe + B
Le + 1 = Le
Le + 2 = Le
Le + 3 = Le
e: code of edge adjustment block e + 1: code one outside the edge adjustment block e + 2: code two outside the edge adjustment block e + 3: code three outside the edge adjustment block L: adjustment block movement amount A: Coefficient B: Coefficient
FIG. 2 shows a coating amount profile and a movement amount profile of the adjustment block shown by the BM meter. The conventional control method in which the adjustment block outside the web edge is not operated has little influence on the web edge portion and stabilizes the profile of the edge portion. Although not connected ((1) in FIG. 2 and (2) in FIG. 2), the application amount of the edge portion can be smoothly stabilized by using the control method according to the present invention ((3) and FIG. 2). (4) of FIG. In addition, it is considered that the movement to the outside by about 3 blocks with respect to the adjustment block corresponding to the edge portion is considered to be most effective, but there is no particular limitation even if it is changed depending on the web width, coating amount, coating liquid property, etc. is not.
[0023]
As a result of the above efforts, as shown in FIG. 2, it is possible to easily correct the coating amount profile of the web edge portion, which has been difficult in the past, and a stable coating amount profile is obtained.
[0037]
【The invention's effect】
When using the coated amount profile control device in a blade coater, and Tsu Do facilitates application amount control of web edge portion.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of a blade coater.
FIG. 2 is a graph comparing a coating amount profile and an adjustment block movement amount profile by control of a web edge portion by a conventional method and the method of the present invention.
(1) BM meter application amount profile used in the conventional method (2) Adjustment block movement amount profile used in the conventional method (3) BM meter application amount profile used in the present method (4) Adjustment block movement amount profile used in the present method

Claims (1)

  A blade for applying the coating liquid 5 blown from the applicator unit 1 to the web 2 that runs continuously on the backing roll 3, and adjusting the applied coating liquid to a required coating amount by the pressing force of the blade 4. As a means for adjusting the coating amount profile in the width direction of the coater, the drive motor 8 connected to the adjustment block is interlocked with the application amount signal sent from the BM meter 7 by pushing and pulling the application amount adjustment block 6. In the apparatus for automatically controlling the coating amount in the web width direction, as a method for controlling the coating amount of the edge portion of the web, the block of the portion protruding outside the web on the basis of one adjustment block corresponding to the edge portion The coating amount control method which adjusts the coating amount of an edge part by pushing and pulling.

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