JP5571221B1 - Roller head extruder and control method thereof - Google Patents

Abstract

A sheet-like member is stably fed out in a roller head extruder.
A screw 16 provided inside an extruder body 12 is rotated to extrude a polymer material from a material outlet 30, and a pair of calendar rolls 20 and 22 provided at the tip of the extruder and a material outlet 30 are provided. In the roller head extruder 10 that forms the extruded polymer material 100 into a sheet shape with a pair of calendar rolls 20 and 22 while forming the bank 38 between them, the screw 16 is rotated by the extrusion drive motor 18, A load current value of the extrusion drive motor 18 is detected by the extrusion drive motor detector 34, and when the detected load current value becomes equal to or greater than the first set value X1, the roll drive motor 24 is turned on and a pair of calendars are turned on. The rotation of the rolls 20 and 22 is started.
[Selection] Figure 3

Description

  The present invention relates to a roller bed extruder provided with a calendar roll at the tip of an extruder.

  A roller head extruder is provided with a pair of calender rolls in the vicinity of the material outlet of the extruder main body, and a polymer material such as rubber extruded from the material outlet of the extruder main body is formed into a sheet shape by the calender roll. Yes (see, for example, Patent Document 1).

  In such a roller head extruder, a material pool called a bank is formed between the material outlet and the calender roll, and in order to stably feed the sheet-like member, a predetermined portion is placed in this part during the operation of the extruder. It is required to secure the bank amount. For example, if the bank amount is too small, a problem such as cutting of a sheet fed from the calendar roll occurs.

  Therefore, in Patent Document 2, a load cell that detects the head pressure of the bank received by the roll housing is attached to the frame in order to stabilize the amount of the bank in which the calendar roll is fitted into the frame via the roll housing. It has been proposed. Further, it has been proposed to control the number of rotations of the screw and calendar roll of the extruder body based on the detection result. However, in this case, since a load cell as pressure detecting means is required, it is necessary to cope with the failure, and maintenance is poor. In this case, since the bank amount is detected by the displacement of the roll housing pressed through the rubber in the bank, the control has a first-order lag element, and the productivity is poor.

  On the other hand, Patent Document 3 discloses a bank amount detector that directly detects a bank amount, a screw current detector that detects a current value of a motor that drives a screw, and a roll that detects a current value of a motor that drives a calendar roll. It is disclosed that a current detector is provided, and feedback control is performed based on the detection results so that the rotational speed of the screw is constant.

  Patent Document 4 detects the current value of the motor for the calendar roll, compares the detected value with a preset setting value, and adjusts the rotational speed of the screw or the calendar roll, It is disclosed that the bank amount is stabilized.

  Thus, the cited document 3 discloses that the rotational speed of the screw is controlled using the current value of the motor that drives the screw or the calendar roll, and the cited document 4 discloses that the motor that drives the calendar roll. It is disclosed that the rotational speed of a screw or calendar roll is controlled based on a current value. However, there is no disclosure of controlling on / off of the calendar roll rotation based on the current value of the motor that drives the screw.

JP-A-1-123720 JP-A-7-156176 JP-A-10-44221 JP-A-11-314261

  The present invention has been made in view of the above points, and controls on / off of a roll drive motor that rotates a calendar roll using a load current value of an extrusion drive motor that rotates an extrusion member such as a screw. Accordingly, an object of the present invention is to provide a roller head extruder that can stably feed out a sheet-like member and a control method thereof.

  A roller head extruder according to the present invention includes an extruder main body, an extrusion member that is provided inside the extruder main body and that rotates to extrude a polymer material from a material outlet of the extruder main body, and the extrusion member. A push drive motor to be rotated, a push drive motor detector for detecting a load current value of the push drive motor, and a bank formed between the material outlets provided at the tip of the extruder, and the extruded high When the load current value detected by the pair of calender rolls for forming the molecular material into a sheet, the roll drive motor for rotating the calender roll, and the extrusion drive motor detector is equal to or higher than the first set value. And a control unit that controls to turn on the roll drive motor and start rotation of the calendar roll.

  The control method of the roller head extruder according to the present invention is such that a polymer material is extruded from the material outlet of the extruder body by rotating an extrusion member provided inside the extruder body, and is provided at the tip of the extruder. A method for controlling a roller head extruder, which forms a bank between a pair of calender rolls and the material outlet, and forms the extruded polymer material into a sheet shape by the pair of calender rolls. The push member is rotated by the motor, the load current value of the push drive motor is detected by the push drive motor detector, and the roll drive motor is turned on when the detected load current value exceeds the first set value. Turn on to start rotation of the pair of calendar rolls.

  According to the present invention, since the roll drive motor that drives the calendar roll is controlled using the load current value of the extrusion drive motor that rotates the extrusion member, the sheet-like member is stabilized without using a load cell. Can be sent out.

It is a longitudinal cross-sectional view of the roller head extruder which concerns on embodiment. It is a cross-sectional view of the roller head extruder according to the embodiment. It is a flowchart which shows an example of control of the roller head extruder. FIG. 4 is a continuation of the flowchart of FIG. 3. It is a graph which shows the load electric current value and calendar roll speed of an extrusion drive motor when controlling according to the flowchart of FIG.3 and FIG.4. It is a flowchart which shows an example of the control at the time of a change of stage.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  The roller head extruder 10 according to one embodiment is a twin screw extruder (more specifically, a twin screw conical extruder) having a roller head. As shown in FIGS. 1 and 2, the extruder 10 includes an extruder body 12 having a chamber 14 therein, a screw 16 as an extrusion member rotatably provided in the chamber 14, and a screw 16. An extrusion drive motor 18 that rotationally drives, a pair of upper and lower calendar rolls 20 and 22 provided at the tip of the extruder 10, and a roll drive motor 24 that rotationally drives the calendar rolls 20 and 22 are provided.

  The extruder body 12 is formed of a cylindrical housing that holds a screw 16 in an inner chamber 14, and a shooter 26 for supplying a polymer material such as a rubber material into the chamber 14 is provided on the upper surface thereof. ing.

  The screw 16 rotates in the chamber 14, thereby conveying the polymer material supplied from the shooter 26 to the distal end side thereof and pushing it out from the material outlet 30 provided on the distal end surface 28 of the extruder body 12. In this example, as shown in FIG. 2, a pair of left and right screws 16, 16 are arranged obliquely to constitute a biaxial conical extruder.

  The extrusion drive motor 18 is connected to the rear end side of the screw 16 via a speed reducer or a coupling (not shown). The extrusion drive motor 18 is electrically connected to a control device 32 as a control unit of the extruder 10, and the screw 16 is rotated at an arbitrary rotational speed by driving and controlling the extrusion drive motor 18 by the control device 32. It is configured to be able to.

  The extrusion drive motor 18 is provided with an extrusion drive motor detector 34 as a current sensor for detecting the load current value. The extrusion drive motor detector 34 is electrically connected to the control device 32, detects the current value (load current value) of the extrusion drive motor 18 based on the signal output from the control device 32, and detects the detected current value. A signal indicating the value is given to the control device 32.

  The pair of upper and lower calendar rolls 20 and 22 are rotatably provided by a support frame 36 in the vicinity of the front of the material outlet 30. Between the calendar rolls 20 and 22 and the material outlet 30, a bank 38 is formed as a material reservoir where the polymer material pushed out from the material outlet 30 is accumulated. In this example, the bank 38 is between the pair of left and right side guides 40 and 40 and the upper and lower leakage prevention walls 42 and 42 between the front end surface 28 of the extruder body 12 and the pair of upper and lower calendar rolls 20 and 22. Is formed.

  The calendar rolls 20 and 22 are for forming a polymer material extruded from the material outlet 30 into a sheet shape. That is, the polymer material 100 extruded from the material outlet 30 and existing in the bank 38 passes through the gap between the rolls 20 and 22 as the pair of calendar rolls 20 and 22 rotates, and is thereby formed into a sheet shape. Then, the sheet-like member 102 is fed forward (left side in FIGS. 1 and 2).

  The roll drive motor 24 is connected to the calendar rolls 20 and 22 via a reduction gear, a coupling, etc. (not shown). The roll drive motor 24 is electrically connected to the control device 32 of the extruder 10, and the calendar drive 20, 22 is rotated at an arbitrary rotational speed by driving and controlling the roll drive motor 24 by the control device 32. It is configured to be able to.

  The roll drive motor 24 is provided with a roll drive motor detector 44 as a current sensor for detecting the load current value. The roll drive motor detector 44 is electrically connected to the control device 32, detects the current value (load current value) of the roll drive motor 24 based on the signal output from the control device 32, and detects the current value. A signal indicating the value is given to the control device 32.

  The control device 32 is configured to control the on / off (ON / OFF) of the roll drive motor 24 based on the load current value of the push drive motor 18 detected by the push drive motor detector 34. . The reason for controlling the turning on / off of the calendar rolls 20 and 22 based on the load current value of the extrusion drive motor 18 is as follows.

  When the amount of the polymer material 100 in the bank 38 (that is, the bank amount) is large, it is difficult to push the polymer material into the bank 38 with the screw 16, and the torque when the screw 16 is rotated increases. As a result, the load current value of the extrusion drive motor 18 increases. Thus, there is a correlation between the load current value of the extrusion drive motor 18 and the bank amount. The larger the load current value, the larger the bank amount, and the smaller the load current value, the smaller the bank amount.

  Therefore, when the roller head extruder 10 is started, whether or not the bank 38 has reached a predetermined bank amount required for stably extruding the sheet-like member 102 is determined based on the load current value of the extrusion drive motor 18. It can be determined based on. Accordingly, when the load current value becomes larger than the set value, it is determined that the predetermined bank amount has been reached, and the rotation of the calendar rolls 20 and 22 may be started.

  Further, whether or not the predetermined amount of the bank can no longer be maintained due to a decrease in the amount of the polymer material charged in the batch manner into the chamber 14 can be determined based on the load current value of the extrusion drive motor 18. Therefore, when the load current value becomes smaller than the set value, it is determined that there is no predetermined bank amount, and the rotation of the calendar rolls 20 and 22 may be stopped.

  Specifically, the control device 32 determines that the load current value detected by the extrusion drive motor detector 34 is the first set value X1 when the extrusion drive motor 18 is on and the roll drive motor 24 is off. When the above is reached (more specifically, when the first set time continues and becomes equal to or greater than the first set value X1), the roll drive motor 24 is turned on (that is, the operation is started), and the calendar roll 20 , 22 is controlled to start rotating.

  The control device 32 is also configured such that when the extrusion drive motor 18 and the roll drive motor 24 are both on, the load current value detected by the extrusion drive motor detector 34 becomes equal to or less than the second set value X2 ( More specifically, when the second set time continues and becomes equal to or less than the second set value X2, the roll drive motor 24 is turned off (that is, the operation is stopped) to stop the rotation of the calendar rolls 20 and 22. To control. Here, the second set value X2 is set to a value smaller than the first set value X1 (X1> X2).

  In the present embodiment, the control device 32 also controls on / off of the roll drive motor 24 based on the load current value of the roll drive motor 24 detected by the roll drive motor detector 44 at the time of changeover. Is configured to do. Here, the time of changing is a step of changing the type of polymer material to be extruded by the extruder 10.

  At the time of such changeover, in order to prevent mixing of different kinds of polymer materials, it is necessary to completely remove the polymer material remaining in the extruder 10 and to empty the bank 38 as well. When the polymer material 100 exists in the bank 38 and is sent out from the calendar rolls 20 and 22, the torque for rotating the calendar rolls 20 and 22 is larger than that in the case of being empty. Therefore, it can be determined whether or not the bank 38 is empty based on the load current value of the roll drive motor 24 that drives the calendar rolls 20 and 22. That is, when the load current value becomes smaller than the set value, it is determined that the bank 38 is empty, and the rotation of the calendar rolls 20 and 22 may be stopped.

  Specifically, when the roll drive motor 24 is turned on at the time of the changeover, the control device 32 detects when the load current value detected by the roll drive motor detector 44 becomes the third set value X20 or less. (More specifically, when the third set time continues and becomes the third set value X20 or less), the roll drive motor 24 is turned off and the calendar rolls 20 and 22 are controlled to stop rotating.

  Next, operation | movement of the roller head extruder 10 which concerns on embodiment is demonstrated based on the flowchart of FIG.3 and FIG.4.

  In step S1, it is detected whether or not a rubber material as a polymer material exists in the shooter 26 of the extruder body 12. The shooter 26 is charged with an unvulcanized rubber material kneaded with a mixer (not shown) such as a Banbury mixer. The shooter 26 is provided with a material sensor 46 that detects the presence or absence of a rubber material. The material sensor 46 is electrically connected to the control device 32, and transmits a detection result to the control device 32. When the rubber material is detected, the process proceeds to step S2.

  In step S2, the extrusion drive motor 18 is turned on to rotate the screw 16. As a result, the rubber material is conveyed toward the material outlet 30 at the tip in the chamber 14.

  Next, in step S3, the control device 32 resets the extrusion stop count T10 (that is, T10 = 0). Here, the extrusion stop count is for counting the time for turning off the extrusion drive motor 18 once turned on when the bank amount does not reach the set value due to an abnormality or the like.

  In step S4, the roll start count T1 is reset (that is, T1 = 0). Here, the roll start count is such that the load current value of the push-out drive motor 18 is equal to or greater than the first set value X1 so that the rotation of the calendar rolls 20 and 22 can be started after the bank amount is stabilized and exceeds a predetermined amount. It counts the time since becoming.

  Next, in step S5, the load current value of the extrusion drive motor 18 is detected by the extrusion drive motor detector 34, and it is determined whether the detected load current value is equal to or greater than the first set value X1. As described above, since there is a correlation between the load current value of the extrusion drive motor 18 and the bank amount, this correlation is obtained in advance, and the sheet-like member 102 is stabilized from the calendar rolls 20 and 22 in accordance therewith. Then, the load current value when the bank amount necessary for pushing out is set in the control device 32 in advance as the first set value X1. As an example, X1 = 80A is set in the example of FIG.

  When the load current value is less than the first set value X1 in step S5, the process proceeds to step S6, and 1 is added to the extrusion stop count T10 (that is, T10 = T10 + 1). In step S7, it is determined whether or not the extrusion stop count T10 has reached the set value T11. If the set value T11 has not been reached, the process returns to step S4. On the other hand, if it has reached the set value T11, it is determined that there is an abnormality, and in step S8, the extrusion drive motor 18 is turned off to stop the rotation of the screw 16, and the process is terminated.

  Here, the set value T11 can be appropriately set according to the time from when the extrusion drive motor 18 is turned on until it is determined to be abnormal. For example, the set value T11 is set to be 20.0 to 60.0 seconds. can do. In this case, the specific setting of the value of the set value T11 is determined by how many times the steps S4 to S7 are performed per second. For example, when the steps S4 to S7 are performed once per second, the setting value T11 is set. The value T11 may be set to 20-60.

  When the load current value is not less than the first set value X1 in step S5, the process proceeds to step S9, and 1 is added to the roll start count T1 (that is, T1 = T1 + 1). In step S10, it is determined whether or not the load current value is less than the first set value X1, and if it is less than the first set value X1, the process returns to step S4. On the other hand, if it is greater than or equal to the first set value X1, the process proceeds to step S11.

  In step S11, it is determined whether or not the roll start count T1 has reached the set value T2. If the set value T2 has not been reached, the process returns to step S5. If the roll start count T1 has reached the set value T2, the process proceeds to step S12.

  The processes in steps S5 and S9 to S11 are performed in order to start rotation of the calendar rolls 20 and 22 after a state in which the load current value of the extrusion drive motor 18 is equal to or more than the first set value X1 continues for a predetermined time. Yes. As shown in FIG. 5, when the extrusion drive motor 18 is turned on and the rotation of the screw 16 is started, the load current value of the extrusion drive motor 18 increases. However, since the load current value varies, In some cases, the set value X1 may be exceeded. In the present embodiment, the state where the load current value is equal to or higher than the first set value X1 continues for the first set time so that the calendar rolls 20 and 22 can be started after the bank amount is stable and exceeds the predetermined amount. The calendar rolls 20 and 22 are rotated. Such a first set time is also set in the control device 32 in advance. The first set time is not particularly limited, and can be set to 2.0 to 5.0 seconds, for example, and is set to 3 seconds in the example shown in FIG. In this case, the specific setting of the setting value T2 is determined by how many times steps S5 and S9-11 are performed per second, for example, when steps S5 and S9-11 are performed once per second. For this, the set value T2 may be set to 2-5.

  Next, in step S12, the roll drive motor 24 is turned on, and the rotation of the calendar rolls 20 and 22 is started. Thereby, as shown in FIG. 5, the speed of the calendar rolls 20 and 22 is increased, and the sheet-like member 102 is sent out from the calendar rolls 20 and 22. Then, the process proceeds to step S13.

  In step S13, the control device 32 resets the roll stop count T3 (that is, T3 = 0). Here, the roll stop count is such that the load current value of the extrusion drive motor 18 is equal to or less than the second set value X2 so that the rotation of the calendar rolls 20 and 22 can be stopped after the bank amount continues to be equal to or less than the predetermined amount. It counts the time since becoming.

  Next, in step S14, the load current value of the extrusion drive motor 18 is detected by the extrusion drive motor detector 34, and it is determined whether the detected load current value is equal to or less than the second set value X2. In accordance with the correlation between the load current value of the extrusion drive motor 18 and the bank amount, the load current value at the bank amount at which the sheet-like member 102 cannot be stably pushed out from the calender rolls 20 and 22 is determined as the first current value. The set value X2 is set in advance in the control device 32. The second set value X2 is set to a value smaller than the first set value X1, and as an example, in the example of FIG. 5, X2 = 65A is set.

  When the load current value is larger than the second set value X2 in step S14, the process returns to step S13, and the sheet-like member 102 is stably molded until it becomes equal to or less than the second set value X2.

  When the load current value becomes equal to or smaller than the second set value X2 in step S14, the process proceeds to step S15, and 1 is added to the roll stop count T3 (that is, T3 = T3 + 1). In step S16, it is determined whether or not the load current value is larger than the second set value X2. If the load current value is larger than the second set value X2, the process returns to step S13. On the other hand, if it is less than or equal to the second set value X2, the process proceeds to step S17.

  In step S17, it is determined whether or not the roll stop count T3 has reached the set value T4. If the set value T4 has not been reached, the process returns to step S14, and if it has reached the set value T4, the process proceeds to step S18.

  The processes in steps S14 to S17 are performed to stop the rotation of the calendar rolls 20 and 22 after the state where the load current value of the extrusion drive motor 18 is equal to or less than the second set value X2 continues for the second set time. Yes. Thereby, the rotation of the calendar rolls 20 and 22 can be stopped after the bank amount is reliably equal to or less than the predetermined amount. Such a second set time is also set in the control device 32 in advance. The second set time is not particularly limited, and can be set to, for example, 2.0 to 5.0 seconds, and is set to 3 seconds in the example shown in FIG. In this case, the specific setting of the numerical value of the setting value T4 is determined by how many times the steps S14 to 17 are performed per second. For example, when the steps S14 to 17 are performed once per second, the setting value T4 is set. The value T4 may be set to 2-5.

  Next, in step S18, the roll drive motor 24 is turned off to stop the rotation of the calendar rolls 20 and 22 (see FIG. 5). Then, the process proceeds to step S19.

  In step S19, the control device 32 resets the extrusion stop count T12 (that is, T12 = 0). Here, the extrusion stop count T12 is set after the roll drive motor 24 is turned off so that the rotation of the screw 16 is stopped after the state where the bank amount is less than the predetermined amount after the calendar rolls 20 and 22 are stopped. This is a time count.

  Next, in step S20, it is determined whether or not the load current value of the extrusion drive motor 18 is equal to or greater than the first set value X1, and if it is equal to or greater than the first set value X1, it is determined that a sufficient bank amount remains. Then, returning to step S12, the roll drive motor 24 is turned on.

  On the other hand, if the load current value is less than the first set value X1 in step S20, the process proceeds to step S21, and 1 is added to the extrusion stop count T12 (that is, T12 = T12 + 1). In step S22, it is determined whether or not the extrusion stop count T12 has reached the set value T13. If the set value T13 has not been reached, the process returns to step S20. If the set value T13 has been reached, the process returns to step S23. move on.

  Here, the set value T13 can be appropriately set according to the time required to turn off the extrusion drive motor 18 after the rubber material in the chamber 14 has been sufficiently delivered to the bank 38. May be set to be 20.0 to 60.0 seconds, and in the example shown in FIG. 5, it is set to 30 seconds.

  In step S23, the rotation of the screw 16 is stopped by turning off the extrusion drive motor 18 (see FIG. 5), and the forming process of the sheet-like member 102 by the roller head extruder 10 is completed.

  Next, a control method at the time of changing the stage will be described with reference to FIG. Here, a case where a change signal is input to the control device 32 from an input unit (not shown) after completion of the molding process will be described.

  In step S31, when a changeover signal is input to the control device 32, in step S32, the extrusion drive motor 18 is turned on to start rotation of the screw 16, and then in step S33, the roll drive motor 24 is turned on. The rotation of the calendar rolls 20 and 22 is started.

  Thereafter, in step S34, the control device 32 resets the stop count T20 (that is, T20 = 0). Here, the stop count T20 is the time from when the load current value of the roll drive motor 24 becomes X20 or less so that the rotation of the calendar rolls 20 and 22 can be stopped after the bank 38 is emptied more reliably. To count.

  Next, in step S35, the load current value of the roll drive motor 24 is detected by the roll drive motor detector 44, and it is determined whether the detected load current value is equal to or less than the third set value X20. As described above, whether or not the bank 38 has become empty can be determined based on the load current value of the roll drive motor 24. Therefore, the control device 32 uses the load current value at that time as the third set value X20. Set in advance.

  When the load current value is larger than the third set value X20 in step S35, the process returns to step S34, and the calendar rolls 20 and 22 are rotated as they are until the third set value X20 or less, and the rubber material 100 is discharged from the bank 38. I do.

  When the load current value becomes equal to or smaller than the third set value X20 in step S35, the process proceeds to step S36, and 1 is added to the stop count T20 (that is, T20 = T20 + 1). Then, in step S37, it is determined whether or not the load current value is greater than the third set value X20. If it is greater than the third set value X20, the process returns to step S34. On the other hand, if it is equal to or less than the third set value X20, the process proceeds to step S38.

  In step S38, it is determined whether or not the stop count T20 has reached the set value T21. If it has not reached the set value T21, the process returns to step S35, and if it has reached the set value T21, the process proceeds to step S39. Here, the set value T21 can be appropriately set according to the time required to turn off the roll drive motor 24 after the bank 38 is surely empty, for example, the time is 10.0 to 60.0 seconds. You may set so that.

  In step S39, the rotation of the screw 16 is stopped by turning off the extrusion drive motor 18. Thereafter, in step S40, the roll drive motor 24 is turned off to stop the rotation of the calendar rolls 20 and 22, thereby completing the discharge of the rubber material 100 in the bank 38 at the time of changing. Therefore, after that, by introducing a different rubber material into the shooter 26 and performing the processing according to the flowcharts of FIGS. 3 and 4, it becomes possible to form the sheet-like member after the change.

  In the present embodiment configured as described above, since the load start value of the extrusion drive motor 18 is used to control the timing of starting and stopping the rotation of the calendar rolls 20 and 22, the sheet shape can be used without using a load cell. The member 102 can be sent out stably. Since no load cell is required, the equipment cost can be reduced. In addition, maintenance around the load cell that is relatively easy to break down becomes unnecessary. Furthermore, since the complicated structure around the calendar roll, which is necessary when detecting the pressure with the load cell, is not required, the structure of the apparatus can be simplified.

  Further, in the present embodiment, since control is performed using the load current value of the extrusion drive motor 18, control without a first-order lag element is possible and control responsiveness is improved as compared with the case where a load cell is used. And since responsiveness improves, the time until it determines ON / OFF of the roll drive motor 24 can be shortened, and productivity improves.

  Further, according to the present embodiment, when the roller head extruder 10 is started, it is determined based on the load current value of the extrusion drive motor 18 whether or not the inside of the bank 38 has reached a predetermined bank amount. Since rotation of the rolls 20 and 22 is started, the sheet-like member 102 can be stably pushed out immediately after the start of rotation by the calendar rolls 20 and 22. Therefore, it is possible to prevent the rubber material that has not been formed into a sheet form from falling in front of the calendar rolls 20 and 22, and unmanned in the vicinity of the calendar rolls 20 and 22 from the start of the extruder 10.

  Further, even when the amount of polymer material charged into the chamber 14 in a batch system decreases and a predetermined bank amount cannot be maintained, the calender rolls 20 and 22 are determined by the determination based on the load current value of the extrusion drive motor 18. Therefore, it is possible to avoid the problem that the sheet-like member 102 is not stably fed out at the end of the molding process.

  Further, in the present embodiment, since the first set value X1 when performing these controls is set to be larger than the second set value X2, the instability from the material outlet 30 when the extruder 10 is started up. The sheet-like member 102 can be molded stably for as long as possible at the end of the molding process while more reliably avoiding the molding failure of the sheet-like member 102 due to the proper extrusion, and the rubber material can be effectively used. .

  In the present embodiment, it is possible to determine whether or not the bank 38 is empty by detecting the load current value of the roll drive motor 24 at the time of changeover. Therefore, by stopping the rotation of the calendar rolls 20 and 22 based on the load current value, the changeover process can be completed promptly when the bank 38 becomes empty.

  In the above embodiment, the control method at the stage has been described for the case where the change signal is input after the molding process shown in FIGS. 3 and 4 is completed. For example, in step S18 in the flowchart shown in FIG. Before (that is, before stopping the roll drive motor 24), the presence or absence of a change signal is detected, and when there is a change signal, the processing after step S34 in FIG. 6 may be performed. .

  Moreover, although the said embodiment demonstrated the case of the twin-screw extruder, it can also apply to a single-screw extruder or a multi-screw extruder more than a triaxial. Moreover, it can apply also to the extruder which uses a gear as an extrusion member instead of a screw like a gear type extruder, and can apply to various extruders which have a roller head.

  As mentioned above, although embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 10 ... Roller head extruder 12 ... Extruder main body 16 ... Screw (extrusion member)
DESCRIPTION OF SYMBOLS 18 ... Extrusion drive motor 20,22 ... Calendar roll 24 ... Roll drive motor 30 ... Material outlet 32 ... Control apparatus (control part)
34 ... Extrusion drive motor detector 44 ... Roll drive motor detector 100 ... Polymer material (rubber material) 102 ... Sheet-like member

Claims (8)

An extruder body;
An extrusion member that is provided inside the extruder body and pushes the polymer material from the material outlet of the extruder body by rotating;
An extrusion drive motor for rotating the extrusion member;
An extrusion drive motor detector for detecting a load current value of the extrusion drive motor;
A pair of calender rolls provided at the end of the extruder, forming a bank between the material outlet and molding the extruded polymer material into a sheet;
A roll drive motor for rotating the calendar roll;
A control unit that controls to turn on the roll drive motor and start rotation of the calendar roll when a load current value detected by the extrusion drive motor detector is equal to or greater than a first set value;
A roller head extruder.   The said control part turns on the said roll drive motor, when the load current value detected by the said detector for extrusion drive motors becomes more than the said 1st setting value continuously for 1st setting time. The roller head extruder according to 1.   The controller turns off the roll drive motor when the load current value detected by the extrusion drive motor detector is equal to or smaller than a second set value that is smaller than the first set value. The roller head extruder according to claim 1, wherein the roller head extruder is controlled to stop the rotation of the roller head.   The said control part turns off the said roll drive motor, when the load current value detected by the said detector for extrusion drive motors becomes below the said 2nd setting value continuously for 2nd setting time. 3. The roller head extruder according to 3. A roll drive motor detector for detecting a load current value of the roll drive motor;
The control unit turns off the roll drive motor and stops the rotation of the calendar roll when the load current value detected by the detector for the roll drive motor becomes equal to or less than a third set value at the time of changeover. The roller head extruder according to any one of claims 1 to 4, wherein the roller head extruder is controlled to be controlled. The extrusion member provided inside the extruder body is rotated to extrude the polymer material from the material outlet of the extruder body, and between the pair of calender rolls provided at the tip of the extruder and the material outlet. A method for controlling a roller head extruder for forming a bank while forming a extruded polymer material into a sheet shape by the pair of calender rolls,
The extrusion member is rotated by an extrusion drive motor,
The load current value of the extrusion drive motor is detected by the extrusion drive motor detector,
A method for controlling a roller head extruder, comprising: turning on a roll drive motor to start rotation of the pair of calender rolls when a detected load current value is equal to or greater than a first set value.   When the load current value detected by the extrusion drive motor detector becomes equal to or smaller than a second set value smaller than the first set value, the roll drive motor is turned off and the pair of calendar rolls are rotated. The method of controlling a roller head extruder according to claim 6, wherein the control is stopped.   When the load current value of the roll drive motor detected by the roll drive motor detector is less than or equal to a third set value when the extruder is changed, the roll drive motor is turned off and the pair of calendar rolls The method of controlling a roller head extruder according to claim 6 or 7, wherein the rotation of the roller head is stopped.

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