JPH0639112B2 - Method of controlling bank amount between rolls of calendar - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] This invention uses a multi-stage roll (3 or more rolls)
The present invention relates to a method for controlling the amount of banks between rolls in a calendar for molding a sheet or film of plastic or the like.

[Conventional technology]

A calender for forming a sheet or film of rubber, plastic or the like is usually constituted by combining 3 to 4 rolls in parallel, and a raw material is continuously rolled 2 to 3 times to form a sheet or film.

In the calendar, it is necessary to pay attention to the amount of banks, that is, the amount of material accumulated between rolls. That is, if the amount of bank is too large (the bank is thick), air may be entrained and a flaw called skip may occur, and since the bank does not rotate smoothly, the material may not be kneaded uniformly, resulting in uneven quality. There is a drawback that occurs. On the other hand, if the bank amount is too small (the bank is thin), problems such as cutting into a sheet or a film and a large thickness variation may occur.

In the past, there was a system that automatically controls the bank amount of the first bank, but there is no system that automatically controls the bank amount of the downstream bank, and the bank amount is controlled by the operator's visual inspection of the bank and manual adjustment based on experience. Was there.

[Problems to be Solved by the Invention]

The method of controlling the bank amount of the downstream bank by manual adjustment has the following problems.

(A) When the materials are switched, it takes time for the bank amount to stabilize and to reach steady operation, and the amount of recycled material is large. (B) In continuous operation, the raw material blending state and the ambient temperature Since the bank amount changes gradually even with a slight change, it is necessary to constantly monitor the bank height (width) and adjust the bank.

The present invention solves the above-mentioned problems in the prior art, automates the control of the bank amount of the downstream bank, reduces the labor of the operator, and takes time to reach the steady operation when the material is switched. It is intended to provide a method for controlling the amount of bank between rolls of a calendar by shortening the time and reducing the amount of recycling of raw materials.

[Means for Solving the Problems]

The present invention relates to a calendar in which a film or sheet-like member is formed while forming banks of a plurality of stages by using three or more rolls, and a bank amount excess / deficiency amount calculated based on detection of the bank amount by a bank sensor, and Expected increase or decrease in the amount of molding material outflow from the bank calculated from the average roll speed of the two rolls forming the bank, or expected increase or decrease in the amount of molding material outflow from the bank calculated from the two roll gaps, or the sum of both , The expected increase or decrease in the amount of molding material inflow into the bank calculated from the average roll speed of the two rolls forming the immediately preceding upstream bank, or the expected increase or decrease in the amount of molding material inflow into the bank calculated from the two roll gaps, or these Calculate the sum of both, and synthesize these bank amount excess / deficiency amount, molding material outflow amount increase / decrease expected amount, molding material inflow amount increase / decrease expected amount Based on the above, the increase / decrease of the material supply amount from each upstream bank to be set for each control cycle time is calculated by the roll gap adjustment motor operation amount of the two rolls forming the upstream bank, the roll cross motor operation amount, and the roll bending pressure. It is provided by controlling any one or a plurality of the roll speed and the stock guide width.

[Work]

According to the present invention, the bank sensor detects the bank amount, obtains the bank excess / deficiency amount, and performs feedback control, predicts the increase / decrease in the amount of molding material consumed from the bank, and predicts the increase / decrease in the consumption amount of the molding material from the bank. Feedforward control is performed in which a control element that influences the inflow amount is controlled by predicting an increase or decrease in the inflow amount of the molding material. This allows
Since the responsiveness and stability of the bank control of the downstream bank can be improved, the labor of the operator is reduced, and the time until the steady operation is reached when the material is switched, etc. Reduction etc. can be achieved.

〔Example〕

An embodiment of the present invention is shown in FIG. This calendar 10
Is configured by combining the first to fourth rolls 12 to 15 in an inverted L shape. The raw material 18 extruded from the extruder 16 is charged by the feed conveyor 20 between the first roll 12 and the second roll 13, and between the first and second rolls 12 and 13, and the second and third rolls 13 and 14. , Each roll gap g1 between the third and fourth rolls 14 and 15
It is formed into a sheet by sequentially passing through g3, stretched by a tick-off roll 24, solidified by a cooling roll (not shown), and wound as a product sheet. First to third banks 26 are provided between the rolls 12 to 15.
~ 28 are formed.

In the first bank 26 between the first and second rolls 12 and 13,
A raw material (molding material) 18 is supplied from a feed conveyor 20, a bank width (or height) of the first bank 26 is detected by a first bank sensor 30 (for example, a television camera), and a first bank controller 32 is provided. The deviation of the bank amount with respect to the reference value is obtained with, and the rotation number of the extruder motor 36 is increased or decreased by the extruder motor control device 34 according to the deviation, and the bank amount is automatically controlled or manually adjusted so as to maintain the reference value. .

Various control devices and control methods for automatically controlling the first bank 26 have already been put into practical use (for example, see Japanese Patent Laid-Open No. 52-132072).

In the second bank 27 between the second and third rolls 13 and 14 and the third bank 28 between the third and fourth rolls 14 and 15,
Second and third bank sensors 38, 40 (for example, TV cameras, reflection type optical sensors, ultrasonic sensors, etc.) for measuring the bank width (or height) are usually provided in each bank. . When a television camera is used, the bank width can be measured by detecting the area of the bank on the television screen by pattern recognition, for example. Also, when using a reflection type optical sensor, it is possible to illuminate the bank and measure the height of the bank by the amount of light (when the bank is high, the distance from the sensor to the bank is short, so the amount of light is large). . When the ultrasonic sensor is used, the height to the bank can be measured because the distance to the bank is detected.

Regarding the mounting positions of the second and third bank sensors 38 and 40, one is in the central part and the other two are in the left zone and the right zone, and the position where the change of the bank width (or height) is detected most is the best. Optimal. In this embodiment, the second and third bank sensors 38, 40 are provided at six locations (2L, 2C, 2R, 3L, 3).
C, 3R).

Normally, three bank sensors are used for one bank, but when using a TV camera, one bank sensor is provided in the center, and this allows the entire three positions of the central part, the left and the right zones to be covered. A method of measuring as desired may be adopted. Also,
Depending on the control method, the number of sensors may be one or two, and the point is that the number of sensors should correspond to the control method (therefore, the number of actuators) as follows.

1 unit: control of average bank width (or height) only 2 units: control of average bank width and left / right balance 3 units: left (L), center (C), right (R) bank width (or Control of height) The second and third bank sensors 38 and 40 detect the bank width (or height) that changes from moment to moment, and the second and third bank controllers 42 detect cycles (for example, 3 to 5 seconds). The average bank width (or height) is calculated for each time, and the change in the bank width (or height) is detected.

Also, sensors for detecting the position of each roll are attached to both ends of each roll. In this embodiment, the rotational position detectors PGG1L, PGG1R, PGG2 are attached to the shafts of the gap adjusting mechanism at both ends of the first, second and fourth rolls 12, 13, 15.
L, PGG2R, PGG4L, and PGG4R are attached, and rotary position detectors PGC1L, PGC1R, and PGC3L are attached to the shafts of the roll cross adjusting mechanisms at both ends of the first and third rolls 12 and 14.
, PCC3R is installed. The second roll 13
Pressure gauges Pb for detecting the bending pressure P2 of the roll bending cylinders 44 at both ends of the pressure gauge are attached.
In this way, the roll gap position, roll cross position, roll bending pressure, etc. of each roll are measured moment by moment.

On the other hand, the roll speeds V1, V2, V of the rolls 12 to 15
3, V4 are roll drive motors M1, M2, M3, M4
Speedometers TG1, TG2, TG3, T mounted on the shaft of
It is measured by G4.

The bank controller 42 controls each roll speed V1 to V4 and each roll gap motor position M1L, M1R, M2L, M2R, M4L,
M4L, roll cross motor positions Mc1, Mc3 and roll bending pressure P2 are constantly detected (for example, 3 to 5).
Every second) to check for these changes. It should be noted that the roll cross motor position is detected only at either the left or right position because the left and right motor positions are controlled to the same position.

In the detection cycle, the gap motor, the cross motor, and the roll bending control device 44 detect the excess / deficiency of the second and third banks 27, 28 obtained from the bank sensors 38, 40, the roll speeds V1 to V4, and the roll speeds V1 to V4. Roll gap motor position M1L, M1R, M2L, M2R, M4L, M4
R, each roll cross motor position Mc1, Mc3, and the sum of the expected bank increase / decrease amount between the control cycles Tc (for example, 10 to 60 seconds) based on the deviation amount of the roll bending pressure P2 from the standard value exceeds a certain limit. When it is determined that the roll gap adjustment motors MG1L, MG1R, MG2L, MG2R, MG4L, MG4R, roll cross adjustment motors MC1L, MC1R, MC3L, MC3R, and roll drive motors M1, M2, M3, M4 are controlled, The motor position and roll cross motor position and roll speed are controlled so that the bank amount returns to a predetermined amount at the end of the control cycle.

When the operating state changes (for example, when there is a disturbance) in the middle of the control cycle (for example, when the operator changes the roll speed), the change occurs in each detection cycle as shown in FIG. Amount, that is, the manipulated variable, is detected, and the residual cycle time (Te
The control items are compensated and controlled according to the amount of increase / decrease of the bank that is expected to occur every second so that the bank does not change significantly at the end of the next control cycle.

Next, the second bank 27 and the third bank 2 by the gap motor, the cross motor, and the roll bending control device 44.
The bank control of No. 8 will be described. The control amount in this bank control is obtained from the following three elements A to C.

(A) Bank excess / deficiency ΔQ ° 3L, ΔQ ° 3C, ΔQ ° 3R, ΔQ ° 2R, ΔQ ° 2C, ΔQ ° 2R bank sensor 40, on the left side, center, and right side of the third and second banks 28, 27. Average bank width (or height) W3L, W3C, W3R, W2L, W2C, W2R obtained from 38 and standard bank width or height W ° 3L, W ° 3C, W ° 3R, W ° 2L,
Due to the difference between W ° 2C and W ° 2R, this bank amount excess / deficiency ΔQ °
3L, ΔQ ° 3C, ΔQ ° 3R, ΔQ ° 2R, ΔQ ° 2C, ΔQ °
Ask for 2R.

The amount of bank (cm ³ ) accumulated between each roll is these 2
It is roughly determined by the roll size of the book and the bank width (or height), and the bank amount near a certain bank width (or height) is the bank width (or height) as shown in FIG. 4 (b).
It is close to the quadratic function of. That is, since the resin is normally completely melted in the second bank 27 and thereafter, the bank rotates. For this reason, the cross section has a circular shape on the upper side as shown in FIG. 4 (a). The roll gap length is usually 0.2 to 1.0 mm, and the bank width is 20 to 50 mm.
The resin accumulation amount in the bank can be considered as a quadratic curve of the bank width.

If the above relationship is applied to each zone of each path, the bank excess / deficiency of each path is ΔQ ° 3L = [f3 (W ° 3L) -f3 (W3L)] × SW3 / 3≈ [f3 '(W ° 3L) × (W ° 3L-W3L)] × SW3 / 3 ... (1) ΔQ ° 3C = [f3 (W ° 3C) -f3 (W3C)] × SW3 / 3 ≒ [f3 '(W ° 3C) × (W ° 3C-W3C)] × SW3 / 3 (2) ΔQ ° 3R = [f3 (W ° 3R) -f3 (W3R)] × SW3 / 3 ≈ [f3 '(W ° 3R) × (W ° 3R-W3R)] × SW3 / 3 (3) ΔQ ° 2L = [f2 (W ° 2L) -f2 (W2L)] × SW2 / 3 ≒ [f2 '(W ° 2L) × (W ° 2L-W2L )] × SW2 / 3 ... (4) ΔQ ° 2C = [f2 (W ° 2C) -f2 (W2C)] × SW2 / 3 ≈ [f2 '(W ° 2C) × (W ° 2C-W2C)] × SW2 / 3 ... (5) ΔQ ° 2R = [f2 (W ° 2R) -f2 (W2R)] × SW2 / 3 ≈ [f2 ′ (W ° 2R) × (W ° 2R-W2R)] × SW2 / 3 (6) Here, f2: The bank width (or height) of the second bank 27 is W ° 2
Function representing the amount of bank accumulation in the vicinity of L, W ° 2C and W ° 2R f2 ': Gradient of f2 in bank width (eg W ° 2L) f3: Bank width (or height) of the third bank 28 is W゜ 3
Function representing the amount of bank accumulation in the vicinity of L, W ° 3C and W ° 3R f3 ': Gradient of f3 in bank width (eg W ° 3L) W3L, W3C, W3R: Third at the left, center and right positions Bank width (or height) of bank 28 W2L, W2C, W2R: Bank width (or height) of second bank 27 at left, center, and right positions W ° 3L, W ° 3C, W ° 3R, W ° 2L, W ° 2C, W ° 2R: Target (setting) bank width (or height) at each position of each bank 28, 27 for optimum operating condition SW2, SW3: Length of second and third banks (B) The amount of resin (Q ^out ) passing through each pass during the control cycle Tc (second) for increasing / decreasing the amount of outflow from each bank 27, 28 is as shown in FIG. It is represented by.

Here, G: Roll gap between two rolls Va + Vb: Two roll speeds Tc: Control cycle of bank control Coefficient: An experimentally obtained coefficient of 1.2 to 1.3 for each pass Sheet width: Sheet width with two roll gaps Considering the increase / decrease in the outflow amount in the steady operation state, the factor that gives the change is the roll gap G (first to third roll gaps g1 to g3).
Each roll gap of g3 is set to G1 to G3)
And the change of the two roll speeds Va and Vb and the change of the sheet width, the increase / decrease amount (ΔQ ° out) of the amount of resin passing through is In this equation, the first term represents the influence when the roll gap G changes. The second term represents the influence when the roll speeds Va and Vb change. The third term represents the effect of changing the sheet width, and normally it should be considered only when changing the width of the stock guide of the first bank 26.

If the equation (8) is applied to the three zones of the banks 27 and 28, the following is obtained. Here, a case where the width between the stock guides 8 and 9 of the first bank is not changed will be described.

In the formulas (12) to (14), the sheet width is the sheet width between the third roll 14 and the fourth roll 15, but this is approximately the sheet width SW3 on the fourth roll 15.
Since it can be regarded as equal to, the sheet width is approximately SW3. Similarly, in equations (9) to (11), the sheet width is approximately SW2.

(C) The amount of change of the resin flowing into each bank 27, 28 during the control cycle Tc (second) for increasing / decreasing the amount of inflow to each bank 27, 28 is as follows.

The roll gap in the formulas (9) to (14) and (18) to (20) can be calculated from the following continuous conditions.

Also, the deviation amount Δ from the roll gap standard value in each zone
It is difficult to directly measure the values of G1L, ΔG1C, ΔG1R, ..., but the roll gap motor movement amount (ΔM1L,
ΔM1R, ΔM2L, ΔM2R, ΔM4L, ΔM4R) and roll cross motor movement amount (or roll bending pressure movement amount) (ΔM1c, ΔM3C) values, and a matrix with the following calendar structure and molding material characteristic values (K1, K2, K3) It can be indirectly obtained by a calculation formula.

Where, M1: material hardness coefficient in the first roll gap (TON
/ Mm) K1: Calendar rigidity including the frame, roll, etc. in the first roll gap (TON / mm) γ1: Bank sensor when the roll position is moved 1 mm at the L side screw position by the first roll gap motor (MG1L). Roll gap change at no load at position 2L (mm
/ Mm) and is equal to 12 / L.

η1: Gap change amount (mm / mm) under no load at bank sensor position 2C when the roll cross amount is moved 1 mm at the roll cross screw position by the first roll cross motor (MC1) ξ1: First roll cross motor (MC1) The roll gap change amount at the bank sensor position 2R when the roll cross amount is moved by 1 mm at the roll cross screw position (mm / mm) Further, the coefficient of the above matrix is the gap adjustment motor of each path, The coefficient varies depending on the type of actuator such as the cross adjustment motor and roll bending cylinder.

Control of the bank supply amount by the above-described three elements A to C will be described. Increase / decrease amount Δ of the supply amount to the second and third banks 27, 28 required during the control cycle Tc (second)
Q is the above three components A to E as shown in the following equations (23) and (24).
It is calculated by the total value of C. This supply amount can be controlled by controlling each roll speed or by controlling the roll gap (eg, ΔG2L, ΔG2C, ΔG2R, ...) In the upper pass.

Although various control methods are used to obtain ΔQ3L, ΔQ3C, ..., ΔQ2R, depending on the structure of the calendar, there are various possibilities. For example, the operating positions of the roll gap motors MG1L, MG1R, MG2L, MG2R, MG4L, MG4R and the operating positions of the roll cross motors MC1L (= MC1R), MC3L (= MC3R) (the positions of the cross motors are usually the same on the left and right). Alternatively, a method of adjusting the roll bending pressure P2 may be used, and the operation position of the roll gap motors on one side, for example, MG1L, MG2L, MG4L, and the roll speed V.
The method of adjusting the speed of 1 to V4 and the operating position (or roll bending pressure P2) of the roll cross motors MC1L (= MC1R) and MC3L (= MC3R), and the control of the second bank 27 is limited to the first roll cross. Instead of adjusting the operation position of the motor MC1L (= MC1R), a method of changing the stock guide width of the first bank 26 may be used.

Further, when a disturbance due to an operator operation occurs in the middle of the control cycle, the remaining cycle time (Te) is used instead of Tc, and compensation control may be performed with Tc = Te (see FIG. 3). That is, in equations (23) and (24), ΔQ ° 3L = ΔQ ° 3C = ΔQ ° 3R = ΔQ ° 2L = ΔQ ° 2C = ΔQ ° 2R = 0 and formulas (9) to (11), (12) ~ (14) Expression, (1
8) to (20), the roll speed change amount (ΔV1, ΔV2, ΔV3, Δ) with respect to the operator operation (disturbance)
V4) or roll gap change amount (ΔG1L, ΔG1C,
ΔG1R, ΔG2L, ΔG2C, ΔG2R, ΔG4L, ΔG4C, ΔG4R), and T
Control as c = Te.

As described above, in the present invention, not only the feedback control of the bank width (or height) but also the increase / decrease in the outflow amount from the bank (gap) and the increase / decrease in the inflow amount from the upstream bank are controlled for the bank to be controlled. Predict the effect of amount on bank width (or height) (feed forward)
Since the bank control is performed by using the bank control, remarkably stable control can be obtained as compared with simple feedback control. Further, since the compensation control is also performed for the disturbance caused by the operator's operation, there is no problem in the followability.

A specific example of bank control of the apparatus shown in FIG. 1 will be described.
The control elements are the second roll gap motors MG2L and MG2R and the roll bending cylinder 44 for the third bank 28, and the first roll gap motors MG1L and MG1R and the roll cross motor MC1L (= for the second bank 27).
MC1R). The disturbance elements are roll speeds V1 to V4, operating positions (M4L, M4R) of the fourth roll gap motors MG4L and MG4R, and cross motor MC3L (= MC3).
It is the operation position (M3C) of R). These are the second mentioned later
It is indicated by a thick line in the figure.

(1) Control of the third bank 28 The increase / decrease in the amount of supply to the left, center, and right zones required during the control cycle Tc (seconds) is indicated by ΔQ3L, ΔQ3C, and ΔQ3R. Motor MG2L, MG2R, 3rd roll cross motor MC
3L (MC3R) operation (operation amount Δ2L, Will be supplied by.

These relational expressions are as follows.

Here, ΔG2L, ΔG2C, and ΔG2R are required gap movement amounts at the time of load, but since this is difficult to measure, they are indirectly calculated from the equation (26) by the motor operation amount (Δ2L, Δ2C, Δ2R).

From these equations, the required manipulated variables Δ2L, Δ2C, Δ2R
Can be calculated by the following formula.

Here M2: Material hardness coefficient in the second roll gap (TON
/ Mm) K2: Calendar rigidity including the frame, roll, etc. in the second roll gap (TON / mm) γ2: Bank sensor when the roll position is moved 1 mm at the L side screw position by the second roll gap motor (MG2L). Roll gap change (mm / mm) without load at position 2L, which is equal to 13 / L.

η 2: The second roll bending pressure (P2) is a unit amount (1
kg / cm ² ) Gap change amount under no load at the bank sensor position 2C when changed (mm / kg / cm ² ) ξ2: The second roll bending pressure (P2) is a unit amount (1
kg / cm ² ) Unloaded roll gap change amount at bank sensor position 2R when changed (mm / kg / cm ² ) (2) Control of the second bank 27 The control of the second bank 27 can also be calculated by the following equation, considering the same as the third bank 28.

The above control is shown in a control block diagram in FIG. 2A and FIG.
It becomes the figure B. FIG. 2A shows control of the third bank 28, second B
The figure shows the control of the second bank 27. However, the amount of molding material flowing out from the second gap Is theoretically the amount of molding material flowing into the third bank However, due to control error, dead zone, backlash, etc. in actual machine control, the controlled operation amount (Δ
2L) is the actual movement amount Is different from The calculated value and the measured value are not necessarily equal. Therefore, in the case of calculation control, the deviation amount (ΔM2L) from the actual standard value of the gap motor and cross motor is actually measured, and this value is used. It is practically important to calculate and obtain. Therefore, in the above example, after waiting for the end of the control of the third bank 28 (adjustment of the second roll gap motors MG2L, MG2R, adjustment of the second roll bending pressure P2), these operating positions (M2L, M2C, M2R)
Is measured, and based on the result, control of the amount of inflow into the second bank 27 (adjustment of the operating position of the first roll gap motors MG1L and MG1R and the operating position of the first roll cross motor MC1L (= MC1R)) is performed. To do.

In order to understand the above relationship, consider the case of performing bank adjustment by manual operation in comparison with the block diagram of control.

Now, for example, the second bank 27 has target bank heights on the L, C, and R sides, but the L side of the third bank 28 is less than the target bank height, the R side is large, and the C side is the target height. (The state of FIG. 5A).

In order to increase the L side of the third bank 28 and decrease the R side thereof, the L side of the second roll gap g2 may be opened and the R side may be closed (operation of FIG. 5).

The second bank 27 maintains the target bank height at present, but if the above operation is performed, the second bank 2 will remain as it is.
The L side of 7 gradually decreases, and the R side of 7 gradually increases.

Therefore, if the operator has experience, anticipate the mutual relation between them, and at the same time with the above operation, the first roll gap g1
It is considered that the L side of R is opened by an appropriate amount and the R side is closed (5th
Figure operation). By operating in this manner, the third bank 28 can be returned to the predetermined height while keeping the second bank 27 at the predetermined height.

Then, when the third bank 28 returns to the predetermined state after the time Tc (state of FIG. 5B), the second roll gap g2
The L side is closed and the R side is opened (operation in FIG. 5 ') to return to an appropriate position and the L side of the first roll gap g1 is closed and the R side is opened (operation in FIG. 5'). The one-roll gap g1 is also returned to the original position. With this operation, it is possible to keep the second bank 27 at the target bank height and stably maintain the third bank 28 at the target bank height after the operation.

If the operation is not complete, the third bank 28 gradually deviates from the target bank height (change in broken line in FIG. 5), but at this time, the second roll gap g2 and It suffices to operate the first roll gap g1. Further, if the third bank 28 is stable but the second bank 27 changes, only the first roll gap g1 needs to be changed.

In any case, if the above operation is performed, the upper bank is not significantly affected by the gap adjustment and the cross adjustment for the lower bank adjustment, and stable bank adjustment can be performed.

In the automatic bank control according to the present invention, the above series of operations are sequentially performed for each control cycle while detecting not only the bank height but also the change in the gap position and the like, so that all bank fluctuations are small and stable. Table 1 shows the procedure of the series of manual operations in the case of automatic control in comparison with each other on the block diagrams of FIGS. 2A and 2B.

[Modifications] In the above embodiments, the present invention is applied to an inverted L-shaped four-calendar, but the present invention uses three or more rolls to form a film or sheet for rubber, plastic, etc. It can also be applied to the calendar of.

For example, FIG. 6 (a) is a three-roll calendar for rubber or plastic, (b) is a five-roll calendar for plastic, and (c) is a six-roll calendar for plastic. It is possible to provide a bank sensor in each bank other than the first bank to perform feedback control, and to perform feedforward control by the method described above.

The number of sensors provided in each bank may be one or more. For example, when the number of bank sensors in each stage is one, the number of items to be controlled may be one. Further, when there are two, only two kinds are required. When only one roll is used, the roll speed is controlled on one side only, or the left and right gaps are moved simultaneously.
Methods such as parallel control are possible.

Also, a method of interlocking control without providing the bank sensor in all the banks is conceivable. Since the bank height of the last stage is the most important in the actual operation of the calendar, it is conceivable that only the last bank is provided with a bank and the upstream of that bank is interlocked.

For example, in the example of FIG. 7, there is no bank sensor for measuring the height of the second bank. At this time, in the block diagram (FIG. 2B), control may be performed by regarding ΔQ ° 2L = ΔQ ° 2C = ΔQ ° 2R = 0.

〔The invention's effect〕

As described above, according to the present invention, in addition to the feedback control in which the bank height (or width) is measured and the excess or deficiency of the bank amount is determined and controlled, the consumption amount from the bank or the inflow into the bank Since the feedforward control system that predicts and controls the increase / decrease in the amount is also used, the control response and stability are very high, and the labor of the operator is reduced. Further, since both the inflow amount and the outflow amount to the bank are considered, there is no mutual interference (hunting due to control) between the banks. Therefore, when the materials are switched, the time required to reach the steady operation is shortened, and the recycling fee of the raw materials is reduced.

Further, according to the invention described in claims 2 and 3, it is possible to control the bank amount without providing bank sensors for all the banks.

Further, according to the invention described in claim 4, the bank amount can be appropriately controlled even with respect to the disturbance in the middle of the control cycle.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a calendar roll bank amount control device showing an embodiment of the present invention. 2A and 2B are block diagrams of the control by the control devices 42 and 44 of FIG. 1, FIG. 2A relating to the third bank, and FIG. 2B relating to the second bank. FIG. 3 is a time chart showing the control when there is a disturbance. FIG. 4 is a diagram showing the relationship between the bank width and the bank amount. FIG. 5 is a time chart showing a specific example of control by the control devices 42 and 44 of FIG. 6 and 7 are views showing various calendars to which the present invention is applied. 10 ... Calendar, 12-15 ... Roll, 26-28
...... Bank, 30, 38, 40 …… Bank sensor, 44
... Roll bending cylinders, MG1L, MG1R, M
G2L, MG2R, MG4L, MG4R ... Roll gap motor, MC1L, MC1R, MC3L, MC3R ... Roll cross motor, M1, M2, M3, M4 ... Roll drive motor.

Claims (4)

[Claims] 1. A calendar in which a film or sheet-like member is formed while forming a bank of a plurality of stages by using three or more rolls, and a bank amount excess / deficiency calculated based on the detection of the bank amount by a bank sensor, Expected increase or decrease in the amount of molding material outflow from the bank calculated from the average roll speed of the two rolls forming the bank, or expected increase or decrease in the amount of molding material outflow from the bank calculated from the two roll gaps, or the sum of both And the expected increase or decrease in the amount of molding material inflow into the bank calculated from the average roll speed of the two rolls forming the immediately preceding upstream bank, or the expected increase or decrease in the amount of molding material inflow into the bank calculated from the two roll gaps, or Calculate the sum of both of these, and synthesize the bank amount excess / deficiency amount, molding material outflow increase / decrease expected amount, molding material inflow increase / decrease expected amount Based on the above, the amount of increase / decrease in the amount of material supplied from the upstream bank during the control cycle time is calculated based on the roll gap adjustment motor operation amount, roll cross motor operation amount, roll bending pressure, and roll speed of the two rolls forming the upstream bank. A method for controlling a bank amount between rolls of a calendar, which is provided by controlling any one or more of the stock guide widths. 2. At least one bank sensor is provided at least in the final stage to perform the bank control by performing the control in the final stage, and regarding the upstream bank, the bank amount excess / deficiency amount of each bank is regarded as zero. 2. The method for controlling a bank amount between rolls of a calendar according to claim 1, wherein the control is performed based on a sum of the expected increase / decrease amount of the molding material outflow amount and the expected increase / decrease amount of the molding material inflow amount. 3. At least one bank sensor is provided in the last stage and at least one bank other than the last stage, and the bank control having the bank sensor is performed by performing the control described above, and the bank having no bank sensor is also performed. 2. The control is performed based on the sum of the expected increase / decrease amount of the molding material outflow amount and the expected increase / decrease amount of the molding material inflow amount, with the bank amount excess / deficiency amount of each bank being regarded as zero. Method for controlling bank amount between rolls of calendar. 4. The compensation control according to any one of claims 1 to 3, wherein for the disturbance in the middle of the control cycle, the bank amount excess / deficiency is set to 0 and the remaining time is set to the control cycle time. Method for controlling bank amount between rolls of calendar.