JP2022032464A - Control system, manufacturing apparatus, and manufacturing method - Google Patents

Abstract

To shorten a control time.SOLUTION: In the production of a resin film including the step of conveying a resin material discharged from a gear pump 23 by pushing the resin material into the gear pump 23 and the step of forming the resin film from the resin material, a control system 10 controls a pressure of the resin material extruded into the gear pump 23, a rotation speed of the gear pump 23, and a conveying speed of the resin film, the control system having: a target value acquisition unit 11 for acquiring a target value of a conveying speed, a measured value acquisition part 12 for acquiring measured values of the conveying speed; a calculation part 13 that calculates a set value for the conveying speed based on the acquired measured values and the target value; and a control part 14 that controls the rotation speed of the gear pump 23 and the conveying speed of the resin film in an order based on a relationship between the measured values of the conveying speed and the calculated set value of the conveying speed after first controlling the pressure of the resin material.SELECTED DRAWING: Figure 1

Description

The present invention relates to a control system, a manufacturing apparatus, and a manufacturing method for manufacturing a resin film.

Conventionally, a resin raw material is extruded into a gear pump and discharged, and the discharged resin raw material is conveyed to form a resin film for production (see, for example, Patent Document 1). For example, acrylic protective films, which are members for polarizing plates, are manufactured using acrylic resin as a resin raw material.

Japanese Unexamined Patent Publication No. 4-125123

When starting the production of a resin film, or when starting the production of different resin films (for example, those having different thicknesses) in the line being manufactured, usually, the rotation speed of the gear pump, the transport speed of the resin film, etc. It is necessary to gradually adjust the conditions of the manufacturing equipment to the newly molded resin film. Since what is manufactured until the conditions of the manufacturing apparatus are adjusted to the new resin film is wasted, it is required to shorten the control time.

The present invention has been made in view of the above, and an object of the present invention is to provide a control system, a manufacturing apparatus, and a manufacturing method capable of shortening a control time.

In order to achieve the above object, the control system according to the present invention has a step of pushing out a resin raw material into a gear pump and discharging the resin raw material to convey the resin raw material discharged from the gear pump, and a step of forming a resin film from the resin raw material. A control system that controls the pressure of the resin raw material extruded into the gear pump, the rotation speed of the gear pump, and the transport speed of the resin film in the manufacture of the resin film containing the resin film. Calculation to calculate the set value of the transport speed based on the means, the measured value acquisition means for acquiring the measured value of the transport speed, the measured value acquired by the measured value acquisition means, and the target value acquired by the target value acquisition means. After first controlling the pressure of the means and the resin raw material, the rotation speed of the gear pump and the transport speed of the resin film are determined in order based on the magnitude relationship between the measured value of the transport speed and the set value of the transport speed calculated by the calculation means. It is provided with a control means for controlling.

In the control system according to the present invention, after the pressure of the resin raw material is first controlled, the rotation speed of the gear pump and the transport speed of the resin film are determined in the order based on the magnitude relationship between the measured value of the transport speed and the set value of the transport speed. Be controlled. According to the control system according to the present invention, the control time until the transport speed reaches the target value can be shortened. That is, the supply of the resin raw material and the transportation of the resin film can be stabilized in a short time.

The control means may repeatedly control the pressure of the resin raw material, the rotation speed of the gear pump, and the transport speed of the resin film. According to this configuration, even when the measured value of the transport speed and the target value of the transport speed are far apart from each other, the transport speed can be surely set to the target value.

When the measured value acquired by the measured value acquiring means is smaller than the set value of the transport speed, the control means may control the pressure of the resin raw material, the rotation speed of the gear pump, and the transport speed of the resin film in this order. good.

When the measured value acquired by the measured value acquiring means is larger than the set value of the transport speed, the control means may control the pressure of the resin raw material, the transport speed of the resin film, and the rotation speed of the gear pump in this order. good.

The manufacturing apparatus according to the present invention is a resin film manufacturing apparatus including the above control system.

The manufacturing method according to the present invention manufactures a resin film including a step of extruding a resin raw material into a gear pump and discharging the resin raw material to convey the resin raw material discharged from the gear pump, and a step of forming a resin film from the resin raw material. In the manufacturing method, a target value acquisition step for acquiring a target value of a transport speed, a measured value acquisition step for acquiring a measured value of a transport speed, a measured value acquired in the measured value acquisition step, and a target value acquisition step. The calculation step of calculating the set value of the transport speed based on the target value acquired in the above step, and the measured value of the transport speed and the set value of the transport speed calculated in the calculation step after first controlling the pressure of the resin raw material. It includes a control step for controlling the rotation speed of the gear pump and the transport speed of the resin film in the order based on the magnitude relationship. Since the manufacturing method according to the present invention includes the target value acquisition step, the measured value acquisition step, the calculation step, and the control step, the manufacturing method is to be manufactured in a stable state between the supply of the resin raw material and the transportation of the resin film. Can be done. Therefore, the resin film obtained by the production method according to the present invention has a uniform thickness.

In the control step, the pressure of the resin raw material, the rotation speed of the gear pump, and the transport speed of the resin film may be repeatedly controlled.

In the control step, when the measured value acquired in the measured value acquisition step is smaller than the set value of the transport speed, the pressure of the resin raw material, the rotation speed of the gear pump, and the transport speed of the resin film may be controlled in this order. good.

In the control step, when the measured value acquired in the measured value acquisition step is larger than the set value of the transport speed, the pressure of the resin raw material, the transport speed of the resin film, and the rotation speed of the gear pump may be controlled in this order. good.

The resin raw material may contain an acrylic resin, and the resin film may be an acrylic resin film.

According to the present invention, the control time can be shortened.

It is a figure which shows typically the structure of the control system which concerns on embodiment of this invention, and the manufacturing apparatus which includes a control system. It is a flowchart which shows the manufacturing method which is the process executed by the manufacturing apparatus which concerns on embodiment of this invention. It is a table which shows the Example and the comparative example which concerns on embodiment of this invention.

Hereinafter, embodiments of the control system, the manufacturing apparatus, and the manufacturing method according to the present invention will be described in detail together with the drawings. In the description of the drawings, the same elements are designated by the same reference numerals, and duplicate description will be omitted.

FIG. 1 schematically shows a control system 10 according to the present embodiment and a manufacturing apparatus 1 including the control system 10. The manufacturing apparatus 1 is an apparatus for manufacturing a resin film (thin film) from a resin raw material. The manufacturing apparatus 1 manufactures a resin film by carrying out a step of pushing out a resin raw material to a gear pump 23 and discharging the resin raw material to convey the resin raw material discharged from the gear pump 23 and a step of forming a resin film from the resin raw material. do. The resin raw material is not particularly limited, and examples thereof include acrylic resin. The resin film to be produced is not particularly limited, and examples thereof include an acrylic resin film such as an acrylic protective film which is a member for a polarizing plate.

The manufacturing apparatus 1 can manufacture different resin films according to these conditions by changing the pressure of the resin raw material extruded to the gear pump 23, the rotation speed of the gear pump 23, and the transport speed of the resin film. For example, resin films having different thicknesses can be produced.

As shown in FIG. 1, the manufacturing apparatus 1 includes an extruder 21, a resin pressure gauge 22, a gear pump 23, a die 24, and a transport roll 25 as an apparatus for producing a resin film. The manufacturing apparatus 1 may include a configuration other than the above, which is included in a normal resin film manufacturing apparatus.

The extruder 21 is provided with a screw for extruding the resin raw material and a raw material input port inside the extruder 21. In the extruder 21, the resin raw material charged from the raw material input port is kneaded and extruded. The extruder 21 can control the pressure of the resin raw material extruded by the rotation speed of the screw. The screw is rotated by a motor included in the extruder 21. The resin pressure gauge 22 is a sensor that measures the pressure of the resin raw material that is extruded by the extruder 21 and put into the gear pump 23. The resin pressure gauge 22 and the control system 10 are connected so that information can be transmitted and received to each other. The measured value of the pressure measured by the resin pressure gauge 22 is output from the resin pressure gauge 22 to the control system 10.

The control system 10 controls feedback control using the measured value of the pressure, specifically, control of the extruder 21 (screw) according to the measured value of the pressure of the resin raw material output from the resin pressure gauge 22. conduct.

The gear pump 23 is a device that sucks in and discharges the resin raw material extruded by the extruder 21. The amount of the resin raw material discharged by the gear pump 23 per unit time is a constant amount according to the rotation speed per unit time of the gear pump 23 (hereinafter, the rotation speed per unit time is simply referred to as the rotation speed). As the number of revolutions increases, the amount of resin raw material discharged increases, which causes the resin film to become thicker. As the number of revolutions decreases, the amount of resin raw material discharged decreases, which makes the resin film thinner.

The gear pump 23 includes a rotation speed meter (encoder) that measures the rotation speed. The gear pump 23 is controlled so that the rotation speed becomes a set value. The control is performed, for example, based on feedback control using the measured value of the rotation speed, specifically, the above-mentioned setting value of the rotation speed transmitted from the control system 10.

The die 24 is a mold for molding the resin raw material discharged by the gear pump 23 into a resin film. The transport roll (polishing roll) 25 transports the resin film that has passed through the die 24 while cooling it. For example, as shown in FIG. 1, the transport roll 25 is configured to include a plurality of rolls. The transport roll 25 transports the resin film by rotating one of the plurality of rolls (for example, the central roll shown in FIG. 1) by a motor. As the transport speed of the resin film by the transport roll 25 increases, the resin film becomes thinner. As the transport speed decreases, the resin film becomes thicker.

The transport roll 25 includes a speedometer (encoder) for measuring the transport speed of the resin film. In the transport roll 25, the rotation is controlled so that the transport speed becomes a set value. The control is performed, for example, based on feedback control using the measured value of the transport speed, specifically, the above-mentioned set value of the transport speed output from the control system 10. The above is the configuration for manufacturing the resin film of the manufacturing apparatus 1.

The control system 10 is a device that controls the conditions for manufacturing the resin film in the manufacturing device 1. Specifically, the control system 10 has a GP pre-pressure, which is the pressure of the resin raw material extruded into the gear pump 23 (the pressure of the resin raw material measured by the resin pressure gauge 22), and a GP rotation speed, which is the rotation speed of the gear pump 23. , L / S (line speed), which is the transport speed of the resin film by the transport roll 25, is controlled. Usually, these conditions are fixed conditions depending on the thickness of the resin film to be manufactured and the like.

In the manufacturing apparatus 1, the control system 10 controls the GP prepressure, the GP rotation speed, and the L / S according to the conditions of the resin film to be manufactured.

As the control system 10, for example, a conventional computer configured to include hardware such as a processor and a memory can be used. The control system 10 may be configured as a computer system including a plurality of computers. Each function described later in the control system 10 is exhibited by operating these components by a program (software) or the like. The control system 10 is connected to the extruder 21, the resin pressure gauge 22, the gear pump 23, and the transfer roll 25 so as to be able to send and receive information to and from each other so that the above control is possible.

The function of the control system 10 according to the present embodiment will be described. As shown in FIG. 1, the control system 10 includes a target value acquisition unit 11, a measured value acquisition unit 12, a calculation unit 13, and a control unit 14.

The target value acquisition unit 11 is a target value acquisition means for acquiring the target value of the L / S. The target value of L / S corresponds to the conditions for producing a desired resin film. For example, a target value of L / S is set in advance for each resin film to be manufactured. The target value acquisition unit 11 receives, for example, an operation of inputting a target value to the control system 10 by an operator and acquires an L / S target value. The L / S in the manufacturing apparatus 1 is, for example, a value in (m / min) units, and the target value of L / S is also a value in (m / min) units.

Further, the target value acquisition unit 11 acquires the target values of the GP prepressure and the GP rotation speed in addition to the target value of L / S. The target values of the GP prepressure and the GP rotation speed also correspond to the conditions for producing a desired resin film. For example, the target value acquisition unit 11 may accept an input operation by the operator and acquire the target values of the GP prepressure and the GP rotation speed in the same manner as the target value of the L / S. Alternatively, the target value acquisition unit 11 may calculate and acquire the target values of the GP prepressure and the GP rotation speed from the acquired target values of the L / S. The calculation of the target values of the GP prepressure and the GP rotation speed from the target value of L / S can be performed by a conventional method. The GP pre-pressure in the manufacturing apparatus 1 is, for example, a value in (MPa) units, and the target value of the GP pre-pressure is also a value in (MPa) units. The GP rotation speed in the manufacturing apparatus 1 is, for example, a value in (rpm) units, and the target value of the GP rotation speed is also a value in (rpm) units.

The target value acquisition unit 11 outputs each acquired target value to the calculation unit 13 and the control unit 14. The control by the control system 10 is performed, for example, starting from the target value acquired by the target value acquisition unit 11.

The measured value acquisition unit 12 is a measured value acquisition means for acquiring the measured value of L / S. The speedometer provided in the transport roll 25 continuously measures the L / S while the manufacturing apparatus 1 is in operation, and transmits the measured value of the L / S to the control system 10 each time. The measured value acquisition unit 12 receives the measured value of L / S transmitted from the speedometer. In this way, the measured value acquisition unit 12 acquires the measured value of L / S in real time. In addition, the measured value acquisition unit 12 also acquires the measured values of the GP prepressure and the GP rotation speed in real time. The measured value acquisition unit 12 receives the measured value of the GP pre-pressure from the resin pressure gauge 22. The measured value acquisition unit 12 receives the measured value of the GP rotation speed from the rotation speed meter provided in the gear pump 23. The measured value acquisition unit 12 outputs the acquired measured values of the L / S, GP prepressure and GP rotation speed to the calculation unit 13 and the control unit 14.

The calculation unit 13 is a calculation means for calculating the L / S set value based on the measured value acquired by the measured value acquisition unit 12 and the target value acquired by the target value acquisition unit 11. When the difference between the target value and the L / S, GP prepressure, and GP rotation speed (measured value) at the start of control is large, when trying to control up to the target value with one control, the manufacturing device 1 Problems such as damage to the devices constituting the device may occur. Therefore, the control system 10 controls the L / S, the GP prepressure, and the GP rotation speed to gradually approach the target values by controlling a plurality of times. The set value calculated by the calculation unit 13 is a value (targeted) controlled by each control. The calculation unit 13 calculates the set values of the GP prepressure and the GP rotation speed in addition to the set values of L / S.

The calculation unit 13 stores, for example, an upper limit value of one control for the GP rotation speed preset as a value that can be controlled without any problem. The upper limit of one control is, for example, 0.5 (rpm). In the calculation unit 13, target values of L / S, GP prepressure, and GP rotation speed are input from the target value acquisition unit 11. Further, in the calculation unit 13, measured values of L / S, GP prepressure and GP rotation speed are input from the measured value acquisition unit 12. The measured value used for the calculation by the calculation unit 13 is a measured value (measured value at the start of control) input immediately before the timing at which the target value is input.

The calculation unit 13 subtracts the measured value at the control start time from the target value for the GP rotation speed. The value obtained by this is a value that fluctuates the GP rotation speed by control. The calculation unit 13 divides the obtained value by the upper limit value of one control, and raises the absolute value of the obtained value. The value obtained by this is the total number of controls up to the target value.

The calculation unit 13 calculates a value obtained by subtracting the measured value at the control start time from the target value for each of the L / S, GP prepressure, and GP rotation speed, and divides the value by the total number of controls up to the target value. , The value is set to be a value to be changed by the control per control. The calculation unit 13 adds the value to be changed by the control per control × the number of controls to the L / S, the GP prepressure and the GP rotation speed (measured value) at the start of the control, and for each control count. Calculate the target value (that is, each of the first time, the second time, ..., the total number of times). Regarding the GP rotation speed, the set value of the control excluding the last one is set as the value obtained by adding the upper limit value of one control x the number of controls to the measured value at the start of control, and the last one. The control set value may be set as the target value.

In the above example, the upper limit of one control is set for the GP rotation speed, but the upper limit of one control is set for the L / S or GP pre-pressure, and the L / S or GP pre-pressure is set. The set value may be calculated in the same manner as described above based on the upper limit value of one control of the pressure. Alternatively, the upper limit value of one control is set for all of L / S, GP prepressure and GP rotation speed, and the value is set when the total number of controls up to the target value based on them is the largest. A value may be calculated. The calculation unit 13 outputs to the control unit 14 the set values for each of the calculated total number of controls and the L / S, GP prepressure, and GP rotation speed for each control count.

After first controlling the GP prepressure, the control unit 14 first controls the GP rotation speed and the L / S in the order based on the magnitude relationship between the measured value of the L / S and the set value of the L / S calculated by the calculation unit 13. It is a control means for controlling. The control unit 14 may repeatedly control the GP prepressure, the GP rotation speed, and the L / S. When the measured value of L / S is smaller than the set value of L / S, the control unit 14 may control the GP prepressure, the GP rotation speed, and the L / S in this order. When the measured value of L / S is larger than the set value of L / S, the control unit 14 may control the GP prepressure, the L / S, and the GP rotation speed in this order. Specifically, the control unit 14 controls as follows.

The control unit 14 inputs the target values of L / S, GP front pressure, and GP rotation speed from the target value acquisition unit 11. Further, the control unit 14 inputs the measured values of the L / S, the GP prepressure and the GP rotation speed from the measured value acquisition unit 12. The input of the measured value is performed in real time as described above. The control unit 14 inputs from the calculation unit 13 the set values for each of the total number of controls and the L / S, GP prepressure, and GP rotation speed for each control count.

The control unit 14 controls the GP pre-pressure by transmitting the set value of the GP pre-pressure for each number of times of control to the extruder 21. For example, the set value of the first GP pre-pressure is transmitted to the extruder 21 (screw) at the start of the first control. The extruder 21 operates so that the GP pre-pressure becomes a set value. Similarly, the control unit 14 transmits the set value of the GP rotation speed for each control number to the gear pump 23 to control the GP rotation speed. Similarly, the control unit 14 transmits the set value of L / S for each number of times of control to the transport roll 25 to control the GP rotation speed. The control unit 14 monitors the measured values of GP prepressure, GP rotation speed, and L / S, and determines whether or not the measured values satisfy the conditions based on the set values for each control time.

Normally, the measured values of GP rotation speed and L / S reach the target values in an extremely short time as compared with the GP prepressure. On the other hand, the GP prepressure has a longer time to reach the target value than the GP rotation speed and L / S. Therefore, when the control of the GP pre-pressure is completed, it may be considered that the control of the GP pre-pressure, the GP rotation speed and the L / S is completed. Further, it is determined whether or not the measured value of the GP prepressure is within a predetermined range (that is, a range that can be regarded as equivalent to the set value), and the measured value is set in advance for a predetermined period of time. If it is determined that the pressure is within the range, it may be considered that the GP prepressure has reached the set value. That is, with respect to the GP pre-pressure, if the measured value is a value that is close to the set value continuously for a certain period of time or longer, it may be considered that the GP pre-pressure, the GP rotation speed, and the L / S have reached the set values, respectively ( In this case, the measured value meets the condition based on the set value). The average of the measured values of the GP prepressure may be used for the above determination. Further, not only the GP prepressure but also the GP rotation speed and L / S may be used together to determine whether or not the set value by the control unit 14 has been reached.

When the control unit 14 determines that the measured value satisfies the condition, the control unit 14 performs control in the same manner as described above using the set value of the next time. When the number of times of control reaches the total number of times, the control unit 14 determines whether or not the measured value satisfies the end condition of the entire control. For example, the control unit 14 determines whether or not the GP pre-pressure, GP rotation speed, and L / S measured values are within a predetermined range (that is, a range that can be regarded as equivalent to the target value). If it is determined that all the measured values are within the range for a predetermined period of time, it is assumed that the end condition of the entire control is satisfied. That is, if each measured value of GP prepressure, GP rotation speed, and L / S continues for a certain period of time or more and is close to each target value, it may be considered that the control is completed (in this case, the measured value is Satisfies the end condition of the entire control). In addition, the average of each measured value may be used for the above-mentioned determination. When the control unit 14 determines that the measured value satisfies the end condition of the entire control, the control unit 14 ends the control.

The control unit 14 controls each time when the measured value of L / S at the time of performing control is smaller than the set value of L / S, that is, when the L / S is accelerated (the L / S is increased). In, the GP prepressure, the GP rotation speed, and the L / S can be controlled in this order. In this case, the control unit 14 transmits the set values in the order of the GP prepressure, the GP rotation speed, and the L / S to the extruder 21, the gear pump 23, and the transfer roll 25. The transmission of the set value may be sequentially performed regardless of whether or not the conditions based on the set value are satisfied for each GP prepressure, GP rotation speed, and L / S. For example, the set value of the GP pre-pressure is transmitted to the extruder 21, and the set value of the GP rotation speed is transmitted to the gear pump 23 after a preset time (for example, 1 or 2 seconds) has elapsed. Further, the set value of the GP rotation speed is transmitted to the gear pump 23, and the set value of the L / S is transmitted to the transport roll 25 after the preset time (for example, 1 or 2 seconds) has elapsed. The reason why there is a short time (for example, 1 or 2 seconds) between each control as described above is that stable control is performed by controlling the next parameter after the control of the previous parameter is started. Is.

When the measured value of L / S at the time of performing control is larger than the set value of L / S, that is, when the L / S is decelerated (the L / S is reduced), the control unit 14 controls each time. , GP prepressure, L / S and GP rotation speed are controlled in this order. Except that the order in this case has changed, the control is the same as in the case of increasing the speed of L / S.

The order of the above control may be stored in advance in the control unit 14 depending on whether the L / S is accelerated or decelerated. Alternatively, the control unit 14 may compare the measured value of L / S at the time of performing control with the set value of L / S, and perform control in an order according to the comparison result. The above is the function of the control system 10 according to the present embodiment.

Subsequently, the process by the control system 10 (operation method performed by the manufacturing apparatus 1) according to the present embodiment will be described with reference to the flowchart of FIG. At the start of this process, the manufacturing apparatus 1 is in operation, and a resin raw material is supplied to the manufacturing apparatus 1 to manufacture a resin film. This processing is an example of a case where the speed of the L / S is increased as compared with that before the start of the processing.

In this process, first, the target value acquisition unit 11 acquires the target value of the L / S, the GP prepressure, and the target value of the GP rotation (S01, target value acquisition step). Further, the measured value acquisition unit 12 acquires the measured values of the L / S, the GP prepressure, and the GP rotation speed (S02, measured value acquisition step). It should be noted that the measurement value acquisition unit 12 continuously acquires the measured value while the present processing is being performed.

Subsequently, based on the measured value acquired by the measured value acquisition unit 12 by the calculation unit 13 and the target value acquired by the target value acquisition unit 11, the total number of controls and the L / S and GP for each number of controls The set values of the front pressure and the GP rotation speed are calculated (S03, calculation step).

Subsequently, the control unit 14 performs control based on the set values of the L / S, GP prepressure, and GP rotation speed of the first control. First, control is performed to set the GP prepressure to a set value (S04, control step). Specifically, the control unit 14 transmits a set value to the extruder 21 to perform the control. Subsequently, control is performed to set the GP rotation speed to a set value (S05, control step). Specifically, the control unit 14 transmits a set value to the gear pump 23 to perform the control. Subsequently, control is performed to set the L / S to the set value (S06, control step). Specifically, the control unit 14 transmits a set value to the transport roll 25, and the control is performed.

Subsequently, the control unit 14 determines whether or not the number of times of control is the total number of times (S07, control step). When it is determined that the number of times of control is not the total number of times (NO in S07), the control unit 14 subsequently determines whether or not the measured value at that time satisfies the condition based on the set value. (S08, control step). When it is determined that the measured value does not satisfy the condition based on the set value (NO in S08), the determination is repeated until it is determined that the measured value satisfies the condition based on the set value (S08, control). Step).

When it is determined that the measured value satisfies the condition based on the set value (YES in S08), subsequently, the control unit 14 controls the L / S, GP prepressure, and GP rotation speed of the next control. The set value of (S09, control step) is used, and the same control and determination as described above (S04-S07, control step) are performed. In S07, when it is determined that the number of times of control is the total number of times (YES in S07), subsequently, the control unit 14 determines whether or not the measured value at that time satisfies the control end condition. (S10, control step). When it is determined that the measured value does not satisfy the control end condition (NO in S10), the determination is repeated until it is determined that the measured value satisfies the control end condition (S10, control step).

When it is determined that the measured value satisfies the control end condition (YES in S10), the resin film is manufactured at the controlled L / S, GP prepressure and GP rotation speed. That is, in the manufacturing apparatus 1, the resin film is manufactured under desired conditions.

The above-mentioned processing was an example in which the speed of the L / S was increased from that before the start of the processing, but when the L / S was decelerated from before the start of the processing, the GP rotation speed control (S05) and L were performed. The process is the reverse of the order of / S control (S06). The above is the process executed by the manufacturing apparatus 1 according to the present embodiment.

The control in the manufacturing apparatus 1 may be performed by, for example, an operator of the manufacturing apparatus 1 other than the control system 10. A part of the main body that performs the manufacturing method according to the present embodiment is the operator. In this case, the manufacturing apparatus 1 may not include the control system 10.

In the present embodiment, after the GP prepressure is first controlled, the GP rotation speed and the L / S are controlled in the order based on the magnitude relationship between the measured value of L / S and the set value of L / S. By first controlling the GP prepressure, which normally takes a long time to control, according to the present embodiment, the control time until the L / S reaches the target value can be shortened.

The GP prepressure, the GP rotation speed, and the L / S may be repeatedly controlled as in the present embodiment, that is, the control may be performed a plurality of times as described above. According to this configuration, even when the measured value of L / S at the start of control and the target value of L / S are greatly separated, the L / S can be surely set as the target value. However, when the difference between the measured value of L / S at the start of control and the target value of L / S is small, the L / S may be set to the target value by one control.

When the measured value of L / S is smaller than the set value of L / S as in the present embodiment, that is, when the speed of L / S is increased, the order of GP prepressure, GP rotation speed and L / S It may be controlled to. When the speed of L / S is increased, the resin film to be conveyed is usually thinned, but the influence on the production of the resin film is reduced by controlling the GP rotation speed before increasing the speed of L / S. Can be done. As a result, it is possible to manufacture in a stable state in which the supply of the resin raw material and the transportation of the resin film are stable.

On the other hand, when the measured value of L / S is larger than the set value of L / S, that is, when the L / S is decelerated, the GP prepressure, the L / S and the GP rotation speed are controlled in this order. May be good. When the L / S is decelerated, the conveyed resin film is usually thick, but by controlling the GP rotation speed after decelerating the L / S, the influence on the production of the resin film can be reduced. As a result, the resin film can be stably produced. However, the order of controlling the GP prepressure, the GP rotation speed, and the L / S may be any order other than the above, as long as the GP prepressure is the first.

The manufacturing method according to the present invention includes a step of extruding a resin raw material into a gear pump 23 and discharging the resin raw material to convey the resin raw material discharged from the gear pump 23, and a step of forming a resin film from the resin raw material. The manufacturing method includes the above-mentioned target value acquisition step, measurement value acquisition step, calculation step, and control step.
In the present manufacturing method, each set value of GP prepressure, L / S and GP rotation speed is arbitrary, but for example, the set value of GP prepressure is 0.1 to 60 (MPa) and the set value of L / S. Is 1 to 200 (m / s), and the GP rotation speed is set within the range of 0.1 to 60 (rpm).
Since the manufacturing method according to the present invention includes the target value acquisition step, the measured value acquisition step, the calculation step, and the control step, the manufacturing method is to be manufactured in a stable state between the supply of the resin raw material and the transportation of the resin film. Can be done. Therefore, the resin film obtained by the production method according to the present invention has a uniform thickness.

Subsequently, an embodiment according to the present embodiment will be described. FIG. 3 shows an embodiment and a comparative example of the present embodiment. This embodiment is an example in which the speed of the L / S is increased and the L / S reaches the target value by three times of control. In this embodiment, Example 1 when the GP prepressure, GP rotation speed, and L / S are controlled in this order, Example 2 when the GP prepressure, L / S, and GP rotation speed are controlled in this order, and Comparative Example 1 is shown in the case where the GP rotation speed, L / S, and GP prepressure are controlled in this order (that is, when the GP prepressure is controlled in the order in which they are not first).

The table of FIG. 3 shows the control time (time required to complete the speed increase) until the L / S reaches the target value in each of Example 1, Example 2, and Comparative Example 1. As shown in the table of FIG. 3, the control time of Example 1 and Example 2 is shorter than that of Comparative Example 1. Further, when the first embodiment and the second embodiment are compared, the control time of the first embodiment is shorter. As described above, in this embodiment, it is shown that the control time can be shortened. Further, the table of FIG. 3 shows the control time (time required to complete the speed increase) until the stability L / S of the produced resin film reaches the target value in each of Example 1 and Example 2. .. As shown in the table of FIG. 3, the stability of the resin film in Example 1 is better than that in Example 2. As described above, in this embodiment, it is shown that high stability of the resin film can be obtained according to the order of control.

1 ... Manufacturing equipment, 10 ... Control system, 11 ... Target value acquisition unit, 12 ... Measurement value acquisition unit, 13 ... Calculation unit, 14 ... Control unit, 21 ... Extruder, 22 ... Resin pressure gauge, 23 ... Gear pump, 24 ... Die, 25 ... Conveyance roll.

Claims (10)

The pressure of the resin raw material extruded into the gear pump in the production of the resin film including the step of extruding the resin raw material into the gear pump and discharging the resin raw material to convey the resin raw material discharged from the gear pump and the step of forming the resin film from the resin raw material. A control system that controls the number of revolutions of the gear pump and the transport speed of the resin film.
Target value acquisition means for acquiring the target value of transport speed, and
A measured value acquisition means for acquiring the measured value of the transport speed, and
A calculation means for calculating a set value of a transport speed based on a measured value acquired by the measured value acquiring means and a target value acquired by the target value acquiring means, and a calculation means.
After first controlling the pressure of the resin raw material, the rotation speed of the gear pump and the transfer of the resin film are in order based on the magnitude relationship between the measured value of the transfer speed and the set value of the transfer speed calculated by the calculation means. Control means to control the speed and
Control system with. The control system according to claim 1, wherein the control means repeatedly controls the pressure of the resin raw material, the rotation speed of the gear pump, and the transport speed of the resin film. When the measured value acquired by the measured value acquisition means is smaller than the set value of the transport speed, the control means takes the order of the pressure of the resin raw material, the rotation speed of the gear pump, and the transport speed of the resin film. The control system according to claim 1 or 2. When the measured value acquired by the measured value acquisition means is larger than the set value of the transfer speed, the control means takes the order of the pressure of the resin raw material, the transfer speed of the resin film, and the rotation speed of the gear pump. The control system according to claim 1 or 2. A resin film manufacturing apparatus comprising the control system according to any one of claims 1 to 4. A manufacturing method for producing a resin film, which comprises a step of extruding a resin raw material into a gear pump and discharging the resin raw material to convey the resin raw material discharged from the gear pump, and a step of forming a resin film from the resin raw material.
The target value acquisition step to acquire the target value of the transport speed, and
The measured value acquisition step to acquire the measured value of the transport speed, and
A calculation step for calculating a set value of the transport speed based on the measured value acquired in the measured value acquisition step and the target value acquired in the target value acquisition step, and
After first controlling the pressure of the resin raw material, the rotation speed of the gear pump and the transfer of the resin film are in order based on the magnitude relationship between the measured value of the transfer speed and the set value of the transfer speed calculated in the calculation step. Control steps to control the speed and
Manufacturing method including. The manufacturing method according to claim 6, wherein in the control step, the pressure of the resin raw material, the rotation speed of the gear pump, and the transport speed of the resin film are repeatedly controlled. In the control step, when the measured value acquired in the measured value acquisition step is smaller than the set value of the transport speed, the order of the pressure of the resin raw material, the rotation speed of the gear pump, and the transport speed of the resin film. The manufacturing method according to claim 6 or 7. In the control step, when the measured value acquired in the measured value acquisition step is larger than the set value of the transport speed, the order of the pressure of the resin raw material, the transport speed of the resin film, and the rotation speed of the gear pump. The manufacturing method according to claim 6 or 7. The resin raw material contains acrylic resin and contains
The production method according to any one of claims 6 to 9, wherein the resin film is an acrylic resin film.

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