JPH04326962A - Start-up controller of painting apparatus - Google Patents

Abstract

PURPOSE:To make start-up control easy by previously preparing a line speed estimation curve for each-brand, estimating the painting amount alteration at the start-up time according to the aiming painting amount and the aiming line speed as well as the line speed estimation curve read out of a brand file corresponding to the designated brand, and controlling to obtain the desired painting amount. CONSTITUTION:A brand file 30 to store line speed estimation curves sets a line speed for each brand, for example, of 30 brands. The painting amount alteration is estimated by a painting amount alteration estimating means 40 based on the aiming line speed 44, a line speed estimation curve 46 read out of the brand file 30 according to a designated brand, and the line delay between estimating meters 12, 20 on upper-and down- stream sides for the given aiming painting amount 42. The deviation between the synchronous measurement output of the estimating meters 12, 20 on the upper and down-stream sides and the output of the painting amount alteration estimating means 40 is computed by an operation amount controlling modulator 60 and a blade 16 is so operated to make both values the same. In the case that the brand is changed next time, the line speed estimation curve 46 is transfered and set by an estimation curve and brand control part 50.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a coating device used in the paper manufacturing industry, and more particularly to an improvement in a start-up control device responsible for control at the start of operation.

0002

2. Description of the Related Art The present applicant has proposed a start-up control device for a coating device in Japanese Patent Laid-Open No. 62-201668 and other publications. FIG. 4 is a diagram for explaining the control state, with the vertical axis representing the line speed (machine speed) and the horizontal axis representing the elapsed time. Operation starts when paper runs out, blades are replaced, paper brands are changed, etc. The blade here is an actuator that adjusts the amount of coating, and scrapes off the coating once it has been applied to the paper. The coating amount is determined as a change in the measured value of basis weight meters installed before and after the coating machine. The basis weight meter basically scans back and forth in the width direction of the paper, and this scanning period is called the measurement period T.
It's called s. Since the coated amount cannot be measured until the leading edge of the paper reaches the basis weight meter located after the coating machine, this time delay is called transportation delay time. The line speed increases as shown by the solid line, and the line speed observed with the basis weight meter located after the coating machine is shown as the broken line. line spies
The speed is gradually increased, and the later the position, the greater the slope.

FIG. 5 is a file of line speed changes as seen from the basis weight meter, where the line speed Vt,i (0≦i≦49) at the time i·Ts has elapsed since the start-up control command.
is recorded. Using this file value, the coating amount setting CDs,i is given by the following equation. CDs,i =CDs(Vt,i-1 +Vt,i
)/2V (1) However, when Vt,i ≧Vt, Vt,i =Vt. Here, Vt is the final target setting value of the line speed, and CDs is the coating target value. The calculation formula for the operation output for the blade is given by the following formula. ΔMi={Kp(Ei −Ei−1 )+KIEi
}/K (2) Here ΔMi
is the amount of change in the manipulated output at the time i/Ts has elapsed since the startup control command, Kp is the proportional gain, KI is the integral gain,
K is a gain, Ei is CDi-CDs,i, and independent upper and lower limit dead zones are provided. CDi is the average coating amount measured at the time i・Ts has elapsed since the startup control command, and CDs,i is the i・Ts since the startup control command.
This is the coating amount setting value at the elapsed time point.

0004

[Problem to be Solved by the Invention] However, when observing the actual operation mode, the predicted line speed curve (Fig. 4)
is not uniform. Sometimes the line speed rises steeply, sometimes slowly. Changes in these speed-up patterns are determined depending on the change in coating amount that occurs when changing the brand and the material of the material to be coated. Therefore, the operator had to rewrite the line speed change file (Figure 5) every time the brand was changed, making the process of changing brands complicated.

The present invention has solved this problem, and even if the speed increase pattern of the line speed of the coating machine is changed when changing the brand, the line speed change file can be saved by the operator. The purpose of the present invention is to provide a device that can perform startup control without rewriting.

[0006]

[Means for Solving the Problems] The present invention achieves the above object by controlling the coating amount control operation end using the measured values of the basis weight meters disposed on the upstream and downstream sides of the coating device. The device for controlling the coating amount at startup has the following configuration.

That is, a brand file that stores a line speed prediction curve provided for each brand, a given target coating amount, a target line speed, a line speed prediction curve, and the above-mentioned upstream curve determined by the line speed. A method for predicting coating amount changes based on line transport delays between basis weight gauges located on the side and downstream side, and a means for predicting line speed prediction curves corresponding to a specified brand from the relevant brand file. The prediction curve brand management unit sets as the line speed prediction curve of the work amount change prediction means, and the deviation between the synchronized measurement output of the basis weight meters located on the upstream and downstream sides and the output of this coating amount prediction means. The control means is provided with an adjusting means for calculating and transmitting an operation output to the operation end so that the two coincide.

[0008]

[Function] Each component of the present invention has the following function. The stock file has a line speed prediction curve prepared for each stock in advance. The coating amount change prediction means predicts the coating amount change at startup, and uses the target coating amount, target line speed, and line speed prediction curve as parameters. The prediction curve stock management department selects the line speed prediction curve corresponding to the current stock from the stock file. The operation amount control adjustment means provides an operation amount for operating the actuator so that a desired coating amount can be obtained.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained below with reference to the drawings. Figure 1
1 is a configuration block diagram showing an embodiment of the present invention. FIG. In the figure, a base paper 10 is a paper to be coated with a paint, and is mounted on, for example, an unwinder and sent to a coating line 14 via an upstream basis weight meter 12. A basis weight meter measures the weight per unit area of paper using beta wire, etc. Especially when moisture has been removed, it is called bone dry basis weight. Coating line 1
Reference numeral 4 includes a fountain for storing paint, an applicator roll for coating, a bagging roll for lining the applicator roll with paper, and the like. The blade 16 is installed after the applicator roll, and its pressing force and angle are adjusted by an operating end 70 in order to adjust the coating amount. The dryer 18 removes moisture contained in the paper by coating, and may be an air dryer or a cylinder dryer. The downstream basis weight meter 20 measures the basis weight after coating, and determines the final result of the product wound onto the reel 22.

[0010] The brand file 30 stores a line speed prediction curve, and this line speed is provided for each brand. The number of brands is, for example, 30, and data is collected in advance through experiments and operation records. The coating amount change prediction means 40 determines the difference between the upstream basis weight meter 12 and the downstream basis weight meter 20 determined by the given target coating amount 42, the target line speed 44, the line speed prediction curve 46, and the line speed. Predict changes in coating amount based on line transport delays. This calculation uses the above-mentioned equations (1) and (2). Note that line transport delays are based on distance, and can be expressed as transport delay time using line speed. The predicted curve brand management section 50 reads out the line speed predicted curve corresponding to the designated brand from the brand file 30 and sets it as the line speed predicted curve 46 of the coating amount change prediction means 40, for example, as shown in FIG. It has a data buffer equivalent to one file. The operation amount control regulator 60 is configured to output synchronized measurement outputs of the upstream basis weight meter 12 and the downstream basis weight meter 20 and the coating amount change prediction means 40.
The deviation from the output is calculated and an operation output is sent to the operation end 70 which moves the blade 16 so that the two coincide. Here, synchronous measurement means that the upstream basis weight meter 12 and the downstream basis weight meter 20 measure the basis weight of the same place on the paper, and the basis weight meter is adjusted so that both of them draw the same measurement locus. Controls scanning. At startup, scanning may be stopped and the position fixed.

[0011] The operation of the apparatus thus constructed will now be described. FIG. 2 is an explanatory diagram of maintenance work for brand data in the brand file 30. There are times when you want to change the line speed prediction curve for a certain stock due to changes in operating conditions, etc. In this case, enter new data for the file of the relevant brand.

FIG. 3 shows the line speed of coating amount change prediction means.
FIG. 3 is an explanatory diagram of changing a prediction curve. When the necessary data settings for manufacturing the current brand are completed, the coating machine control device calls up the next brand. Then, that fact is displayed on the CRT provided in the coating machine control device. There, they operate the CRT or touch panel to input the brand that will be manufactured next time. When a brand change occurs between this time and the next time, the predicted curve brand management section 50 transfers and sets the line speed prediction curve 46 corresponding to the brand from the brand file 30 to the coating amount change prediction means 40. As a result, smooth start-up control of the coating apparatus is achieved.

[0013]

[Effects of the Invention] As explained above, according to the present invention, since the line speed prediction curve is managed by brand, it is not necessary for the operator to set control parameters corresponding to differences in operating methods depending on the brand. It can be set up easily and is the star of coating equipment.
This has the remarkable effect of facilitating startup control.

[Brief explanation of drawings]

FIG. 1 is a configuration block diagram showing one embodiment of the present invention.

FIG. 2 is an explanatory diagram of maintenance work for brand data in a brand file 30.

FIG. 3 is an explanatory diagram of changing the line speed prediction curve of the coating amount change prediction means.

FIG. 4 is an explanatory diagram of a startup control state of the coating device.

FIG. 5 is a file of line speed changes as seen from the basis weight meter.

[Explanation of symbols]

30...Brand file 40...Coating amount change prediction means 46...Line speed prediction curve 50...Prediction Curve Stock Management Department 60...Operation amount control adjustment means

Claims (1)

[Claims] Claim 1: A device for controlling the coating amount at startup by operating a coating amount control operation end using the measured values of basis weight meters disposed on the upstream and downstream sides of the coating device. , a brand file that stores a line speed prediction curve set for each brand, a given target coating amount, target line speed, line speed prediction curve, and the above upstream and downstream sides determined by the line speed. A method for predicting changes in coating amount based on line transport delays between basis weight gauges located at The prediction curve brand management unit sets the line speed prediction curve of the means, calculates the deviation between the synchronized measurement output of the basis weight meters located on the upstream and downstream sides, and the output of this coating amount prediction means, and calculates the deviation between the output of the coating amount prediction means and 1. A start-up control device for a coating apparatus, comprising: adjusting means for transmitting an operation output to the operation end so that the operation terminals match.