JPH0685900B2 - Initial value setting device for operating end of coating machine - Google Patents

Description

The present invention relates to an initial value setting device for a coating amount operation output and a moisture content operation output at the start of coating in a coating amount control device.

<Prior Art> An outline of a coating control device will be described with reference to FIG. Reference numeral 1 is a base paper roll, 2 is a base paper pulled out for coating, and 3 is a take-up roll of a paper 2 which has been coated on both sides.

Reference numeral 4 is a first coating means for applying a paint on one surface of the paper 2, 5 is a first B / M meter for measuring the moisture content and basis weight of the paper before coating, 6
Is a first dryer for drying the paper that has passed through the coating means 4.

7 is a second for applying paint to the other surface of the paper 2 that has passed through the dryer 6
A coating means, 8 is a second B / M meter for measuring the moisture content and basis weight of the paper before coating, and 9 is a second dryer for drying the paper which has passed through the coating means 4.

A third B / M meter 10 measures the moisture content and basis weight of the paper 2 that has passed through the second dryer 9.

Reference numeral 11 is a measured value calculation means, which is the first, second, and third B / M meters 5,8,1.
By inputting the measured values M ₁ , M ₂ and M ₃ of 0, the difference between the measured value on the downstream side and the measured value on the upstream side concerning the basis weight and the moisture content is calculated, and the coating amount by the first coating means 4 is calculated. The measured value PV ₁₁ and the moisture content measured value PV ₁₂ on the output side of the dryer 6, the coating amount measured value PV ₂₁ by the second coating means 7 and the moisture content measured value PV ₂₂ on the output side of the dryer 9 are output. The coating amount and the water content are controlled to the target set values based on these measured values.

FIG. 6 is an enlarged view of the coating means 4 and the first dryer 6, and the applicator roll 15 whose lower portion is dipped in the paint 14 in the fan ten 13 with respect to the paper 2 run by the backing roll 12. Are operated to contact with each other, the paint is adhered to the paper via the applicator roll, and a part of the adhered paint is scraped off by the blade 16 to control the coating amount.

17 is an actuator for operating the blade angle, 18 is a coating amount controller, and the coating amount measured value PV ₁₁ and the coating amount setting value SV
₁₁ actuator operation output MV ₁₁ which deviation has a control operation of the
Call 17.

The moisture content is controlled by manipulating the amount of hot air supplied to each dryer. Reference numeral 19 is a supply line of hot air H to the first dryer 6, 20 is a control valve for the hot air supply amount, and 21 is a moisture content controller, which controls and calculates the deviation between the measured moisture content value PV ₁₂ and the set value SV _12. The control valve 20 is operated by the operated output MV ₁₂ .

<Problems to be solved by the invention> With such a configuration, the coating amount and the water content in the steady state can be controlled well, but the initial value of each operation output at the start of coating changes the coating speed. Therefore, it is difficult to control automatically, and the operator sets the empirically determined proper initial value for each product by manual intervention to operate.

That is, when the coating is started, the coating amount operation output and the moisture content operation are fixed by manual operation with a fixed initial value, and after the coating amount is stabilized, the control is switched to the steady control.

Therefore, there is a problem that the setting operation by the operator at the start is complicated and requires experience, and the controllability of the coating amount and the water content at the start is poor and a loss time is generated.

Fig. 7 is a characteristic diagram showing changes in the measured coating amount until the steady state is reached when the initial value setting is not optimal. The coating speed is from start time t ₀ to time t _1. As the coating amount setting value SV ₁₁ also increases as the
PV ₁₁ does not settle to the target coating amount even after the set value reaches the steady state, and requires time t ₂ and the time during this period is the loss time.

It is an object of the present invention to provide an operating end initial value setting device capable of solving such a problem.

<Means for Solving Problems> In the present invention which achieves such an object, a coating amount operation end is controlled by an operation output obtained by controlling and calculating a deviation between a measured value of a coating amount sensor and a coating amount set value. In addition, in the coating machine control device that controls the moisture content operation end by the operation output that controls and calculates the deviation between the measurement value of the moisture content sensor and the moisture content setting value, before the start of coating and when the preparation for coating is completed. The initial value (b ₁ ) of the operation start set from the outside is corrected by the coating speed (S) at the start of coating and before the steady value is reached to obtain the control output (X ₁ ). First calculation means (23) for setting an initial value to the coating amount operation end by the corrected first initial value (X ₁ ) and externally set before starting coating and when preparation for coating is completed Initial value of starting operation (b ₂ )
Is calculated at the start of coating and before the steady value is reached, and the correction output is calculated to obtain the control output (X ₂ ).
It is characterized by having a second calculation means (24) for setting an initial value at the moisture content operating end by the corrected second initial value (X ₂ ).

<Operation> First, an operation start initial value that is often empirically determined for each product is prepared. Next, the initially set operation start initial value is corrected by the coating speed that can be regarded as the coating speed at the start of coating, and the corrected first initial value is given to the coating amount operation end, The initial value is given to the water content control end. As a result, the transient control of the coating amount and the water content until the coating speed is increased to the steady value can be performed relatively stably.

<Example> An example of the present invention will be described with reference to FIG. Fig. 5,
Description of the same elements as those described in FIG. 6 will be omitted, and description of the characteristic portion will be added.

DCS indicates the controller side, and P indicates the process side. Reference numeral 22 is a coating speed sensor provided on the process side, and its measured value PV _S is commonly input to the first calculating means 23 and the second calculating means 24 on the control device side.

Reference numeral 25 denotes a sequence control device, and a coating amount preparation completion signal A ₁ , a moisture content preparation completion signal A ₂ , through an interface 26,
Upon receiving the coating amount initial value setting command signal B ₁ , the moisture content initial value setting command signal B ₂ and the status signal C which is not being coated, the sequence controller 25 inputs them. The sequence controller receives this input and sends a start command to each element.

27 and 28 are operation output interfaces, and 27 is the operation output MV ₁₁ of the coating amount controller 18 and the operation output X ₁ of the first operation means.
To the actuator 17. 28 is the operation output MV ₂₁ of the moisture content controller ₂₁ and the operation output X ₂ of the second operation means.
To control valve 20.

Next, the calculation contents of the first and second calculation means 23, 24 will be described. In the first calculation means 23, when the constant is a ₁ and the operation start initial value of the actuator 17 set from the outside is b ₁ , the calculation output X ₁ is X ₁ when the value of PV _S is S ₁ = A ₁ · S + b ₁ The operation of the linear expression of (1) is executed.

Similarly, in the second calculation means 24, when the constant is a ₂ and the operation start initial value of the valve opening of the control valve 20 set from the outside is b ₂ , the calculation output X ₂ is X ₂ = a ₂ · S + b ₂ (2) The linear expression is calculated.

The outputs X ₁ and X ₂ of the calculation result are guided to the interfaces 27 and 28, respectively, and are supplied to the operation output of the controller and selectively to each operation end, and the initial value is set.

The sequence controller 25 uses the signals A ₁ , A ₂ ,
At the initial value setting stage based on the input of B ₁ , B ₂ , C
After starting the calculation means 23, 24 and supplying the calculation outputs X ₁ , X ₂ to the respective operation ends, after the coating speed reaches the steady state,
Operate each controller 18, 21 and operate output MV in steady control
₁₁ and MV ₂₁ are supplied to each operation end.

FIG. 3 is a flow chart for explaining the signal processing procedure of each calculation means, in which there is a status signal C which is not being coated, and the calculation of the initial value is executed by the coating preparation completion signal A, The speed-corrected initial value is supplied to each operation end by the generation of the initial value setting command B.

FIG. 4 is a flow chart showing the procedure for generating the initial value setting command B. The timer is started after the preparation of the coater head is completed, and the command B is transmitted after a predetermined time T ₁ .

FIG. 2 is a characteristic diagram showing the control result regarding the coating amount when the present invention is applied, and the measured value PV ₁₁ accurately follows the coating amount setting value SV ₁₁ during the coating speed increasing period. The occurrence of lost time is prevented.

Although the embodiment described above is an example of control on the first coating means 4 and the first dryer 6 side, the present invention can be similarly applied to the second coating means 7 and the second dryer 9 side. It is possible.

<Effects of the Invention> As described above, according to the present invention, it becomes possible to automatically and optimally set the coating amount and the initial value setting of the water content operation end with the speed change at the start of coating,
The burden on the operator can be reduced, which contributes to reduction of wasted paper and energy saving.

Further, with respect to the initial value of each operation end corrected by the coating speed at the start of coating, the coating speed as disclosed in JP-A-62-201668 reaches a steady value. If the method of sequentially correcting the operation amount of each operation end according to the coating speed is used until the above, there is an effect that the loss of paper can be further reduced.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention, FIG. 2 is a coating amount control characteristic diagram at the time of start, FIGS. 3 and 4 are flow chart diagrams showing signal processing procedures, and FIG. 6 is a conceptual diagram of the coating machine control device, FIG. 6 is an enlarged view of the coating means and the dryer portion, and FIG. 7 is a control characteristic diagram of the coating amount at the start in the prior art. 11 …… Measured value calculation means, 17 …… Actuator 18 …… Coating amount controller, 19 …… Hot air supply conduit 20 …… Control valve, 21 …… Moisture content controller, 22 …… Coating speed sensor, 23,24 …… First and second computing means, 25 …… Sequence controller 26,27,28 …… Interface

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Nobuaki Hashimoto, Inventor No. 3 Aomori Yachi, Kawara Wood, Aomori Prefecture No. Yokogawa Electric Co., Ltd. (72) Inventor Kazushi Takano 2-9-32 Nakamachi, Musashino-shi, Tokyo Yokogawa Electric Co., Ltd. (56) Reference JP-A-63-54977 (JP, A) JP-A-SHO 62-201668 (JP, A)

Claims (1)

[Claims] 1. A coating amount operation end is controlled by an operation output which controls and calculates a deviation between a measured value of a coating amount sensor and a set value of coating amount, and a deviation between a measured value of a moisture percentage sensor and a set value of moisture percentage. In the coating machine controller that controls the moisture content control end by the operation output that controls the calculation, the initial value (b ₁ ) of the operation start set externally before the start of coating and when the preparation for coating is completed, The control output (X ₁ ) is obtained by performing a correction calculation based on the coating speed (S) at the start of coating and before the steady value is reached, and the coating is performed based on the corrected first initial value (X ₁ ). The first calculation means (23) for setting the initial value at the quantity operation end, and the start value (b ₂ ) of the operation start set externally before the start of the coating and when the preparation for the coating is completed. At some point, correction calculation is performed based on the coating speed (S) before the steady value is reached, and control is output. (X ₂₎ the determined, coating of the corrected second initial value and a second arithmetic means for performing an initial value set in the moisture content operated end by (X ₂₎ (24), characterized in that it has a Initial value setting device for machine operation end.