JP2018051785A - Operation method for rubber extruder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an operation method for a rubber extruder which enables smooth switchover from a first rubber material to a second rubber material.SOLUTION: An operation method for a rubber extruder includes: a first extrusion process S1 for supplying a first rubber material G1 and extruding the first rubber material G1 with a rotary screw 3; a second extrusion process S4 for supplying a second rubber material G2 and extruding the second rubber material G2 with a rotary screw 3; and a rubber material switchover process S3 for switching the material G that is extruded with the screw 3 from the first rubber material G1 to the second rubber material G2 between the first extrusion process S1 and the second extrusion process S4. The switchover process S3 includes a first detection process S32C for detecting whether the first rubber material G1 remains at the slot 2A, and a first rotation process S32 for rotating the screw 3 for a first given length of time (t1) with no first rubber material G1 remaining at the slot 2A after confirmation of no first rubber material G1 remaining at the slot 2A.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a method of operating a rubber extruder including a screw for extruding unvulcanized rubber material.

  As a rubber extruder for extruding an unvulcanized rubber material while kneading, a rubber extruder having a screw inside is known. A conventional rubber extruder of this type extrudes unvulcanized rubber, which has been input from an input port, from the output port while kneading with a screw.

  Such a rubber extruder can, for example, extrude a second rubber material different from the first rubber material after extruding the first rubber material. However, when the second rubber material is introduced after the first rubber material, a mixed portion in which the first rubber material and the second rubber material are mixed is generated.

  However, the mixed portions of both rubber materials cause defective quality or breakage of the rubber materials, and thus need to be discarded. For this reason, when the rubber material to be extruded is changed from the first rubber material to the second rubber material, if there are many mixed portions of both rubber materials, the rubber material to be discarded increases and the productivity is lowered. It was.

  In order to prevent the formation of the above-described mixed portion, the second rubber material has been supplied after the first rubber material is completely discharged from the rubber extruder. This includes, for example, a method of mechanically disassembling the rubber extruder to discharge the first rubber material, and a method of discharging the first rubber material by idling the rubber extruder without adding the rubber material. is there.

  However, when the rubber extruder is disassembled, much time and labor are required for disassembling and assembling the rubber extruder. In addition, when the rubber extruder is operated idle, it is necessary to operate at a low speed in order to suppress the wear of the screw due to the idle operation, and it takes a lot of time to discharge the first rubber material and is unnecessary. In order to prevent idling, it was necessary for the operator to constantly monitor.

  Therefore, in Patent Document 1 below, a connecting portion is provided between the rubber extruder and the gear pump, and the first rubber material is concentrated on the connecting portion, and the first rubber material is discharged outside the device. Proposed driving method.

JP 2005-324395 A

  The rubber extruder disclosed in Patent Document 1 requires a connecting portion and has a problem that the rubber extruder becomes large. Furthermore, in the rubber extruder of patent document 1, the discharge valve and discharge cylinder for discharging | emitting the 1st rubber material concentrated on the connection part were required.

  The present invention has been devised in view of the actual situation as described above, and is a rubber extruder capable of smoothly changing from the first rubber material to the second rubber material without increasing the size of the rubber extruder. The main purpose is to provide driving methods.

  The present invention relates to a barrel having an inlet for charging unvulcanized rubber material and an extrusion port for extruding the rubber material, and capable of being rotationally driven for extruding the rubber material disposed in the barrel. A first extrusion method in which a first rubber material is supplied into the barrel from the charging port and the first rubber material is pushed out from the extrusion port by the rotating screw. A second extruding step of supplying a second rubber material into the barrel from the charging port, and extruding the second rubber material from the extruding port with the rotating screw, the first extruding step, and the second A rubber material changing step of changing the rubber material extruded by the screw from the first rubber material to the second rubber material during the extrusion step, and the rubber material changing step includes the first rubber material changing step. The first rubber material when it is determined in the first detection step and whether or not the first rubber material remains in the first detection step. Including a first rotation step of rotating the screw for a predetermined first time in a state where the screw does not remain in the insertion port.

  In the operation method of the rubber extruder according to the present invention, the first rotation step is performed after the screw is rotated for the predetermined first time in a state where the first rubber material does not remain in the charging port. It is desirable to stop the screw.

  In the operation method of the rubber extruder according to the present invention, it is preferable that in the first detection step, the first rubber material is detected by a photoelectric sensor disposed at a lower portion of the charging port.

  In the operation method of the rubber extruder according to the present invention, the rubber material changing step includes a second rotating step of rotating the screw after the first rotating step, and the second rotating step includes the second rubber. It is desirable to include a second rubber charging step for supplying material into the barrel.

  In the operation method of the rubber extruder according to the present invention, in the second rotation step, the second rubber material is supplied into the barrel, and after rotating the screw for a predetermined second time, It is desirable to stop the screw.

  In the operation method of the rubber extruder according to the present invention, in the second rotation step, when the screw stops, a boundary surface between the first rubber material and the second rubber material is located inside the barrel. It is desirable to do.

  In the method of operating a rubber extruder according to the present invention, the rubber extruder further includes an openable / closable head connected to the extrusion port, and the first rotation step and the second rotation step are respectively It is desirable that the operation be performed with the head closed.

  In the operation method of the rubber extruder according to the present invention, the rubber material changing step includes a step of opening the head after the second rotation step, and a predetermined screw in the state in which the head is opened. A third rotation step for rotating the screw for a third time, and the third rotation step preferably stops the screw after the screw has been rotated for the predetermined third time.

  In the operation method of the rubber extruder according to the present invention, in the third rotation step, when the screw stops, a boundary surface between the first rubber material and the second rubber material is pushed out of the barrel. It is desirable that

  In the operation method of the rubber extruder according to the present invention, the rubber material changing step includes a first detection step of detecting whether or not the first rubber material remains in the inlet. Such a 1st detection process can detect the supply state of 1st rubber material reliably, and can prevent the unnecessary idle driving | operation of a rubber extruder.

  In the operation method of the rubber extruder according to the present invention, in the rubber material changing step, when it is determined in the first detection step that the first rubber material does not remain, the first rubber material remains in the inlet. A first rotation step in which the screw is rotated for a predetermined time without being included.

  Such a 1st rotation process can supply all the 1st rubber materials in a slot into a barrel. Moreover, the 1st rotation process can concentrate the 1st rubber material in a barrel to the extrusion port side. For this reason, the operation method of the rubber extruder according to the present invention can separate the first rubber material and the second rubber material in the barrel or make their boundary surfaces clear.

  Accordingly, when the first rubber material is changed to the second rubber material, for example, only the vicinity of the boundary surface between the first rubber material and the second rubber material needs to be discarded. Therefore, it is possible to reduce the discarded rubber material. In addition, the operation method of the rubber extruder according to the present invention can smoothly change from the first rubber material to the second rubber material.

It is sectional drawing which shows one Embodiment of the rubber extruder with which the operating method of this invention is performed. It is a flowchart which shows one Embodiment of the driving | running method of this invention. It is a flowchart of a rubber material change process. It is a flowchart of a 1st rotation process. It is sectional drawing of the rubber extruder which shows a 1st rotation process. It is a flowchart of a 2nd rotation process. It is sectional drawing of the rubber extruder which shows a 2nd rotation process. It is a flowchart of a 3rd rotation process. It is sectional drawing of the rubber extruder which shows a 3rd rotation process.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view showing a rubber extruder 1 in which the operation method of the present embodiment is performed. As shown in FIG. 1, a rubber extruder 1 used in the present embodiment extrudes an unvulcanized rubber material G while kneading, and is arranged in a substantially cylindrical barrel 2 and a barrel 2. The screw 3 and the head 4 which can be opened and closed are included.

  The barrel 2 of the present embodiment has an input port 2A for inputting the rubber material G and an extrusion port 2B for extruding the rubber material G. The inlet 2A is preferably formed on a side surface on one end side of the barrel 2, for example, an upper surface. The extrusion port 2B is preferably formed on the other end side of the barrel 2.

  A detecting means 5 for detecting the rubber material G is provided in the charging port 2A of the present embodiment. The detection means 5 is, for example, a pair of transmissive photoelectric sensors 5A each composed of a light projecting unit and a light receiving unit. It is desirable that the photoelectric sensor 5A be disposed below the insertion port 2A. In the insertion port 2A, for example, a pair of transmission holes 2a through which the light projected from the photoelectric sensor 5A can be transmitted is formed.

  When the rubber material G remains in the insertion port 2A, the photoelectric sensor 5A cannot receive the light from the light projecting unit because the light receiving unit is blocked by the rubber material G (see FIG. 1). On the other hand, in the photoelectric sensor 5A, when the rubber material G is supplied into the barrel 2 and disappears from the insertion port 2A, the light receiving unit can receive light from the light projecting unit (see FIG. 4 described later). Thereby, the photoelectric sensor 5A can detect that the rubber material G does not remain in the insertion port 2A.

  The screw 3 has a structure that can be rotationally driven for extruding the rubber material G in the barrel 2. The screw 3 preferably includes a screw shaft 3A and a spiral blade 3B that protrudes radially outward of the screw 3 from the screw shaft 3A. The screw shaft 3A is driven by, for example, a driving device M located on the end surface of the barrel 2 on the side of the insertion port 2A. It is desirable that the driving state of the driving device M is controlled by a control device (not shown) based on information from the detection means 5 and the like.

  The head 4 is preferably connected to the extrusion port 2B of the barrel 2. The head 4 of this embodiment includes a base end portion 4A connected to the barrel 2, a pair of open / close portions 4B connected to the base end portion 4A so as to be freely opened and closed, and a die 4C attached to the open / close portion 4B. It is out. It is desirable that the opening / closing part 4B is rotatably connected to the base end part 4A via the fulcrum shaft 4a. The die 4C of this embodiment is mounted on the open / close part 4B in a closed state, and a rubber material G is molded into a predetermined shape.

Next, an embodiment of a method for operating the rubber extruder 1 of the present invention will be described with reference to FIG.
FIG. 2 is a flowchart showing the operation method of the present embodiment. As shown in FIG. 2, the operation method of the present embodiment is a method for changing the rubber material G extruded by the rubber extruder 1 from the first rubber material G1 to the second rubber material G2 (shown in FIG. 7). It is. Here, the first rubber material G1 and the second rubber material G2 are of different types.

<Operation method of rubber extruder>
In the present embodiment, first, a first extrusion step S1 for extruding the first rubber material G1 is performed. 1st extrusion process S1 is a process normally performed when extruding 1st rubber material G1 using the rubber extruder 1. As shown in FIG. In the first extrusion step S1 of the present embodiment, the first rubber material G1 is supplied into the barrel 2 from the charging port 2A, and the first rubber material G1 is extruded from the extrusion port 2B with the rotating screw 3.

  The first extrusion step S1 is performed in a state where the head 4 is closed, and the first rubber material G1 pushed out from the barrel 2 to the head 4 is discharged from the die 4C attached to the head 4. In such a first extrusion step S1, the first rubber material G1 charged from the charging port 2A can be molded into a predetermined shape defined by the die 4C and discharged.

  The first extrusion step S1 can continue to extrude the first rubber material G1 until the rubber change request S2 is made. The rubber change request S2 is made, for example, according to an operator instruction.

  When the rubber change request S2 is made, a rubber material changing step S3 is performed. The rubber material changing step S3 is a step of changing the rubber material G pushed out by the screw 3 from the first rubber material G1 to the second rubber material G2. Details of the rubber material changing step S3 will be described later.

  After the rubber material changing step S3, a second extrusion step S4 for extruding the second rubber material G2 is performed. That is, the rubber material changing step S3 is performed between the first extrusion step S1 and the second extrusion step S4. 2nd extrusion process S4 is a process normally performed when extruding the 2nd rubber material G2 using the rubber extruder 1. FIG. In the second extrusion step S4 of the present embodiment, the second rubber material G2 is supplied into the barrel 2 from the charging port 2A, and the second rubber material G2 is extruded from the extrusion port 2B with the rotating screw 3.

  The second extrusion step S4 is performed in a state where the head 4 is closed, and the second rubber material G2 pushed out from the barrel 2 to the head 4 is discharged from the die 4C attached to the head 4. In such a second extrusion step S4, the second rubber material G2 charged from the charging port 2A can be molded into a predetermined shape defined by the die 4C and discharged. The die 4C may be the same as that used in the first extrusion step S1, or may be different.

<Rubber material change process S3>
FIG. 3 is a flowchart of the rubber material changing step S3. As shown in FIG. 3, in the rubber material changing step S3 of the present embodiment, first, a first rubber charging interruption step S31 for interrupting the charging of the first rubber material G1 is performed. The first rubber charging interruption step S31 is performed, for example, by cutting the first rubber material G1 that is continuously charged. The first rubber charging interruption step S31 may be performed by stopping the charging of the first rubber material G1 that is intermittently charged.

  After the first rubber charging interruption step S31, a first rotation step S32 of rotating the screw 3 in a state where the charging of the first rubber material G1 is interrupted is performed. In the first rotation step S32, the first rubber material G1 remaining in the charging port 2A can be supplied into the barrel 2. As in the first extrusion step S1, the first rotation step S32 is preferably performed with the head 4 closed.

<< First Rotation Step S32 >>
FIG. 4 is a flowchart of the first rotation step S32. As shown in FIG. 4, in the first rotation step S32 of the present embodiment, first, a first rotation start step S32A for starting the rotation of the screw 3 is performed. In the first rotation start step S32A, when the screw 3 is rotating in the first extrusion step S1, the rotation of the screw 3 is continued. On the other hand, when the screw 3 is stopped in the first extrusion step S1 or the rubber change request S2, the screw 3 is rotated again.

  In the first rotation step S32, preparation for charging the second rubber material G2 is started after the first rotation start step S32A (step S32B). Preparation for charging the second rubber material G2 may be performed in a second rubber preparation step S32G described later.

  After step S32B, a first detection step S32C for detecting whether or not the first rubber material G1 remains in the charging port 2A is performed. The first detection step S32C is performed, for example, by detecting the first rubber material G1 by the photoelectric sensor 5A disposed at the lower portion of the insertion port 2A. It is desirable that the first detection step S32C is continuously performed during the first rotation step S32.

  In the first detection step S32C, after the introduction of the first rubber material G1 is interrupted in the first rubber charging interruption step S31, the first rubber material G1 remaining in the charging port 2A is supplied into the barrel 2, and the charging port It is detected that the first rubber material G1 does not remain in 2A. Such 1st detection process S32C can detect the supply state of the 1st rubber material G1 reliably, and can prevent the unnecessary idle driving | operation of the rubber extruder 1. FIG.

  In the first rotation step S32, when it is determined in the first detection step S32C that the first rubber material G1 does not remain, the screw 3 is determined in advance in a state where the first rubber material G1 does not remain in the charging port 2A. During the first time t1, the rotation is performed (step S32D). In such a first rotation step S32, all of the first rubber material G1 in the charging port 2A can be supplied into the barrel 2. That is, the first time t1 for rotating the screw 3 in the first rotation step S32 is a time for supplying at least all of the first rubber material G1 in the charging port 2A into the barrel 2. The first time t1 is desirably a time sufficient to push the first rubber material G1 closer to the driving device M than the charging port 2A to the extrusion port 2B.

  FIG. 5 is a cross-sectional view of the rubber extruder 1 showing the first rotation step S32. As shown in FIG. 5, in the first rotation step S32, since the screw 3 is rotated in a state where the first rubber material G1 does not remain in the charging port 2A, the charging port 2A and the charging port 2A side in the barrel 2 are provided. The first rubber material G1 is extruded toward the extrusion port 2B.

  For this reason, a space V is formed on the inlet 2 </ b> A side in the barrel 2. Such 1st rotation process S32 can concentrate the 1st rubber material G1 in the barrel 2 to the extrusion port 2B side.

  As shown in FIG. 4, in the first rotation step S <b> 32 of the present embodiment, after it is determined that the first rubber material G <b> 1 does not remain, the second rubber material G <b> 2 is passed after a predetermined first time t <b> 1 has elapsed. It is determined whether or not preparation for charging is completed (step S32E).

  If it is determined in step S32E that the preparation for charging the second rubber material G2 is not completed, the screw 3 is automatically stopped after the screw 3 is rotated for a predetermined first time t1. It is desirable that the rotation stopping step S32F be performed. In this case, after the first rotation stop step S32F, a second rubber preparation step S32G for preparing to input the second rubber material G2 with the screw 3 stopped is performed.

  Such 1st rotation process S32 can prevent the unnecessary idle driving | operation of the rubber extruder 1 even if the operator does not always monitor. For this reason, the operating method of this embodiment can change the rubber material G of the some rubber extruder 1 with one operator, for example.

  Further, when it is determined in step S32E that preparation for charging the second rubber material G2 is completed, the second rotation step S33 described later is performed without stopping the screw 3.

<Rubber material change process S3>
As shown in FIG. 3, in the present embodiment, after the first rotation step S32, the second rotation step S33 for rotating the screw 3 is performed in a state where the preparation for charging the second rubber material G2 is completed. As in the first rotation step S32, the second rotation step S33 is desirably performed with the head 4 closed.

<< Second Rotation Step S33 >>
FIG. 6 is a flowchart of the second rotation step S33. As shown in FIG. 6, in the second rotation step S33 of the present embodiment, first, a second rotation start step S33A for starting the rotation of the screw 3 is performed. In the second rotation start step S33A, when the screw 3 is stopped in the first rotation step S32, the screw 3 is rotated again. On the other hand, in the second rotation start step S33A, when the screw 3 is rotating in the first rotation step S32, the rotation of the screw 3 is continued.

  After the second rotation start step S33A, a second rubber charging step S33B for supplying the second rubber material G2 into the barrel 2 is performed. In the second rubber charging step S33B, for example, the second rubber material G2 prepared in the first rotating step S32 is supplied into the barrel 2 from the charging port 2A while the screw 3 is rotated.

  FIG. 7 is a cross-sectional view of the rubber extruder 1 showing the second rotation step S33. As shown in FIG. 7, in the second rubber charging step S33B of the second rotation step S33, when the second rubber material G2 is supplied into the barrel 2, the first rubber material G1 and the second rubber are separated by the space V. The material G2 is separated. For this reason, there is no possibility that the first rubber material G1 and the second rubber material G2 are mixed in the second rubber charging step S33B.

  As shown in FIG. 6, after the second rubber charging step S33B, a second detection step S33C for detecting the second rubber material G2 in the charging port 2A is performed. In the second detection step S33C, for example, the second rubber material G2 is detected by the photoelectric sensor 5A disposed at the lower portion of the insertion port 2A. It is desirable that the second detection step S33C be continuously performed during the second rotation step S33. Such a second detection step S33C can reliably detect whether or not the second rubber material G2 is in a state of being supplied into the barrel 2.

  In the second rotation step S33, when the second rubber material G2 is detected in the second detection step S33C, the second rubber material G2 is supplied into the barrel 2 and the screw 3 is set for a predetermined second time. Rotate for t2 (step S33D). In the second rotation step S33, the screw 3 is rotated for t2 for a second time, whereby the first rubber material G1 whose discharge amount on the extrusion port 2B side is limited by the closed head 4 and the newly supplied second The space V between the rubber material G2 is reduced. Thereby, 2nd rotation process S33 can fill the inside of the barrel 2 with the 1st rubber material G1 and the 2nd rubber material G2.

  Such a second rotation step S33 can clarify the boundary surface GS between the first rubber material G1 and the second rubber material G2. For this reason, the operation method of the present embodiment, when changing the first rubber material G1 to the second rubber material G2, only discards the vicinity of the boundary surface GS between the first rubber material G1 and the second rubber material G2. Since it is good, the rubber material G discarded can be decreased.

  In the second rotation step S33, a second rotation stop step S33E for automatically stopping the screw 3 is performed after the screw 3 has been rotated for a predetermined second time t2. In the second rotation step S33, the boundary surface GS between the first rubber material G1 and the second rubber material G2 is located inside the barrel 2 when the screw 3 is stopped in the second rotation stop step S33E. Is desirable. That is, the second time t2 in which the screw 3 is rotated in the second rotation step S33 is a time during which the boundary surface GS is located inside the barrel 2.

  In such a second rotation stop step S33E, the boundary surface GS of the rubber material G can be located inside the barrel 2 even if the operator is not constantly monitoring, so the boundary surface GS becomes unclear. There is no fear. Thereby, in the operation method of the present embodiment, even when the mixed portion of the first rubber material G1 and the second rubber material G2 is discarded, it is only necessary to discard only the vicinity of the clear boundary surface GS. For this reason, the operating method of this embodiment can reduce the rubber material G discarded even if one worker changes the rubber material G of the plurality of rubber extruders 1.

<Rubber material change process S3>
As shown in FIG. 3, in the present embodiment, an opening step S34 for opening the head 4 is performed after the second rotation step S33. In the opening step S34, for example, the die 4C is removed by an operator, and then the head 4 is opened by rotating the pair of opening / closing portions 4B around the respective fulcrum shafts 4a. Since the opening step S34 can be performed in a state where the screw 3 is stopped, the safety of the operator can be ensured.

  After the opening step S34, a third rotation step S35 for rotating the screw 3 for a predetermined third time t3 with the head 4 opened is performed. In such a third rotation step S35, the screw 3 is rotated with the head 4 opened, so that the rubber material G in the barrel 2 can be pushed out in a short time.

<< 3rd rotation process S35 >>
FIG. 8 is a flowchart of the third rotation step S35. As shown in FIG. 8, in the third rotation step S35 of the present embodiment, first, a third rotation start step S35A for starting the rotation of the screw 3 is performed. Thereafter, in the third rotation step S35, the screw 3 is rotated for a predetermined third time t3 with the head 4 being opened (step S35B).

  FIG. 9 is a cross-sectional view of the rubber extruder 1 showing the third rotation step S35. As shown in FIG. 9, in the third rotation step S35, the head 4 is opened and the discharge amount on the extrusion port 2B side is not limited, so that no large pressure is applied to the first rubber material G1 and the second rubber material G2. . For this reason, 3rd rotation process S35 can be extruded, without making the interface GS of the 1st rubber material G1 and the 2nd rubber material G2 unclear.

  As shown in FIG. 8, in the third rotation step S35, after the screw 3 is rotated for a predetermined third time t3, a third rotation stop step S35C for automatically stopping the screw 3 is performed. In the third rotation step S35, it is desirable that the boundary surface GS between the first rubber material G1 and the second rubber material G2 is pushed out of the barrel 2 when the screw 3 is stopped. That is, the third time t3 in which the screw 3 is rotated in the third rotation step S35 is a time during which the boundary surface GS is pushed out of the barrel 2.

  In such a third rotation step S35, the screw 3 stops when the boundary surface GS of the rubber material G is pushed out of the barrel 2 even if the operator is not constantly monitoring, so an unnecessary second rotation step S35. Extrusion of the rubber material G2 can be prevented. For this reason, the operating method of this embodiment can change the rubber material G of the some rubber extruder 1 with one operator, for example.

<Rubber material change process S3>
As shown in FIG. 3, a closing step S36 for closing the head 4 is performed after the third rotation step S35. In the closing step S36, for example, the operator closes the head 4 by rotating the pair of opening / closing parts 4B around the respective fulcrum shafts 4a by the operator, and then attaches the die 4C. Since the closing step S36 can be performed in a state where the screw 3 is stopped, the safety of the operator can be ensured.

  After the closing step S36, a fourth rotation step S37 for rotating the screw 3 is performed. In the fourth rotation step S37, the second rubber material G2 is extruded from the die 4C of the head 4 with the rotating screw 3.

  In such a fourth rotation step S37, even if the discharge amount is larger than the supply amount of the second rubber material G2 in the third rotation step S35 and the space V is generated in the barrel 2, the barrel 2 The inside can be filled with the second rubber material G2. Further, following the fourth rotation step S37, the second extrusion step S4, which is a normal operation when the second rubber material G2 is extruded using the rubber extruder 1, can be performed.

  In the above-described embodiment, the transmissive photoelectric sensor 5A is exemplified as the detection unit 5. However, the detection unit 5 is not limited to the photoelectric sensor 5A, and a known detection unit 5 may be employed.

  In the above-described embodiment, the die 4C is removed from the head 4 in the opening step S34. However, the die 4C may be removed when the screw 3 is stopped in the first rotation step S32.

  As mentioned above, although the especially preferable embodiment of this invention was explained in full detail, this invention is not limited to embodiment of illustration, It can deform | transform and implement in a various aspect.

  Using the rubber extruder having the structure shown in FIG. 1, an operation for changing from the first rubber material to the second rubber material was performed. The embodiment shown in FIG. 2 and the second example after discharging the first rubber material in the conventional method without discharging the rubber material and discharging the first rubber material without using the rubber material. A conventional example of supplying a rubber material was performed. In each of the example and the comparative example, the time from when the supply of the first rubber material was interrupted until the head was closed was measured. The results are as follows.

<Measurement results>
Example: 120 seconds Comparative example: 330 seconds

  As is clear from the above results, the example can significantly reduce the time required when changing from the first rubber material to the second rubber material, compared with the comparative example. It was confirmed that the change work to the rubber material can be performed smoothly.

DESCRIPTION OF SYMBOLS 1 Rubber extruder 2 Barrel 2A Inlet 2B Extrusion port 3 Screw G Rubber material G1 1st rubber material G2 2nd rubber material

Claims (9)

A barrel having an input port for charging unvulcanized rubber material and an extrusion port for extruding the rubber material; and a rotatable screw arranged in the barrel for extruding the rubber material. A method of operating a rubber extruder including:
A first extrusion step of supplying the first rubber material into the barrel from the charging port and extruding the first rubber material from the extrusion port with the rotating screw;
A second extrusion step of supplying the second rubber material into the barrel from the charging port and extruding the second rubber material from the extrusion port with the rotating screw;
A rubber material changing step of changing the rubber material extruded with the screw from the first rubber material to the second rubber material between the first extrusion step and the second extrusion step;
The rubber material changing step
A first detection step of detecting whether or not the first rubber material remains in the inlet;
When it is determined in the first detection step that the first rubber material does not remain, the screw is rotated for a predetermined first time in a state where the first rubber material does not remain in the charging port. And a first rotating step. A method for operating a rubber extruder.   2. The method of operating a rubber extruder according to claim 1, wherein in the first rotation step, the screw is stopped after the screw is rotated for the first time in a state where the first rubber material does not remain in the charging port.   The operation method of the rubber extruder according to claim 1 or 2, wherein in the first detection step, the first rubber material is detected by a photoelectric sensor disposed at a lower portion of the charging port. The rubber material changing step includes a second rotating step of rotating the screw after the first rotating step,
The operation method of the rubber extruder according to any one of claims 1 to 3, wherein the second rotation step includes a second rubber charging step of supplying the second rubber material into the barrel.   5. The operation of the rubber extruder according to claim 4, wherein in the second rotation step, the screw is stopped after being rotated for a predetermined second time in a state in which the second rubber material is supplied into the barrel. Method.   6. The rubber extruder according to claim 5, wherein, in the second rotation step, a boundary surface between the first rubber material and the second rubber material is located inside the barrel when the screw is stopped. Driving method. The rubber extruder further includes an openable / closable head connected to the extrusion port,
The operation method of the rubber extruder according to any one of claims 4 to 6, wherein the first rotation step and the second rotation step are each performed in a state where the head is closed. The rubber material changing step includes an opening step of opening the head after the second rotating step, and a third rotating step of rotating the screw in a state where the head is opened,
The operation method of the rubber extruder according to claim 7, wherein the third rotation step is stopped after the screw is rotated for a predetermined third time.   9. The rubber extruder according to claim 8, wherein in the third rotating step, when the screw stops, a boundary surface between the first rubber material and the second rubber material is pushed out of the barrel. Driving method.

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