JP7073903B2 - Kneading method and system of rubber material - Google Patents

Description

The present invention relates to a method and system for kneading a rubber material, and more specifically, a rubber material capable of stably producing a kneaded rubber of a predetermined quality and suppressing quality variation due to a difference in a kneading machine. It is about the kneading method and system of.

Rubber products such as tires and rubber hoses are manufactured by vulcanizing a molded product molded from an unvulcanized rubber material. To produce an unvulcanized rubber material, for example, a primary kneaded rubber is first produced by kneading a raw rubber and a non-vulcanized compounding agent such as carbon black, filler, and oil with a closed kneader. .. Then, a vulcanized compounding agent such as sulfur is mixed with the primary kneaded rubber and kneaded to produce a final kneaded rubber, which is used as an unvulcanized rubber material.

In the kneading step, the rubber material is kneaded by applying a shearing force by a rotating rotor. Conventionally, in order to grasp the kneading state, the amount of electric power required to drive the rotor to rotate is detected (see, for example, Patent Document 1). However, the detected electric energy includes a loss in the drive motor that rotationally drives the rotor. Further, since a transmission or the like is interposed between the drive motor and the rotor, the loss of such an intervening mechanism is also included in the detected electric energy. Therefore, it is difficult to accurately grasp the shearing force applied to the rubber material by the rotor. In particular, the magnitude of the shearing force applied to the rubber material and the magnitude of the temperature change of the rubber material generated at that time greatly affect the dispersed state of the compounding agent in the produced kneaded rubber. Therefore, there is room for improvement in the stable production of kneaded rubber of a predetermined quality. Further, even in the kneading process in which the same kneading conditions are set for the rubber materials having the same specifications, the amount of electric power detected differs depending on the kneading machine used, so that the quality of the kneaded rubber varies. Is a concern.

Japanese Unexamined Patent Publication No. 2005-246785

An object of the present invention is to provide a method and system for kneading a rubber material, which can stably produce kneaded rubber of a predetermined quality and suppress variations in quality due to differences in kneading machines. ..

In order to achieve the above object, in the method of kneading a rubber material of the present invention, a rubber material composed of a raw material rubber and a compounding agent is mixed in batches in a kneading chamber of a closed type kneader, and a rotor installed in the kneading chamber is rotated. In the method of kneading a rubber material for producing a kneaded rubber having a target physical property by kneading the rubber material, the shearing force data of the stirring blade constituting the rotor in the kneading step of the rubber material is obtained from the blade tip of the stirring blade or the above. Sequential detection is performed by a strain sensor installed on the inner wall surface facing the blade tip portion of the kneading chamber, and when grasping the kneading state of the rubber material based on the detected shear force data, from the start of the kneading step. The period until the end is set as one evaluation period or a plurality of divided evaluation periods, and the shear force integration target value obtained by integrating the shear force data required for producing the kneaded rubber having the target physical properties in each evaluation period. Is set in advance, and the shear force actual measurement integrated value obtained by accumulating the shear force data in each of the evaluation periods detected sequentially is compared with the shear force integrated target value corresponding to the shear force actual measurement integrated value. It is characterized in that the kneaded state of the rubber material is grasped based on the above .

The rubber material kneading system of the present invention includes a kneading chamber in which a rubber material composed of raw rubber and a compounding agent is charged, a rotor arranged in the kneading chamber, a drive motor for rotationally driving the rotor, and the rotor. The rotor is configured in a rubber material kneading system including a closed kneader including a transmission interposed between the and the drive motor and a control unit for controlling the movement of the closed kneader. A strain sensor installed on the blade tip of the stirring blade or the inner wall surface of the kneading chamber facing the blade tip to sequentially detect the shear force data of the stirring blade, and a calculation unit for sequentially inputting the shear force data. The period from the start to the end of the kneading step is one evaluation period or a plurality of divided periods in which the kneading state of the rubber material is determined by the calculation unit based on the shearing force data. As the evaluation period, the shear force integration target value obtained by integrating the shear force data required for manufacturing the kneaded rubber having the target physical properties in each evaluation period is input to the calculation unit in advance, and the strain sensor is used. The calculation unit is based on a comparison between the shear force actual measurement integrated value obtained by integrating the shear force data in each of the evaluation periods sequentially detected by the above and the shear force integrated target value corresponding to the shear force actual measurement integrated value. The kneaded state of the rubber material is determined by the above method .

According to the present invention, the shear force data in the stirring blade in the kneading step of the rubber material is sequentially detected by the strain sensor installed on the inner wall surface facing the blade tip portion of the stirring blade or the blade tip portion of the kneading chamber. The shear force data detected sequentially does not include the loss in the drive motor and the loss in the transmission etc. intervening between the drive motor and the rotor, and should be regarded as the shear force data given to the rubber material in the kneading process. Can be done. Therefore, since the kneaded state of the rubber material can be grasped more accurately based on the shearing force data, it is advantageous to stably manufacture the kneaded rubber of a predetermined quality. Further, by using this shear force data, it is possible to largely eliminate the influence of the difference in the kneading machine on the kneading state of the rubber material, so that it is possible to suppress the variation in the quality of the kneaded rubber due to the difference in the kneading machine.

It is explanatory drawing which illustrates the kneading system of this invention in a vertical cross-sectional view of a closed type kneader. It is explanatory drawing which illustrates the closed type kneader of FIG. 1 in a plan view. FIG. 1 is a cross-sectional view taken along the line AA of FIG. It is a graph which illustrates the time-dependent change of the shear force data and the temperature data of a rubber material. It is explanatory drawing which illustrates the state which the rubber material is kneaded using the kneading system of FIG. It is explanatory drawing which illustrates another embodiment of a kneading system in a vertical cross-sectional view of a closed type kneader.

Hereinafter, the method and system for kneading the rubber material of the present invention will be described based on the embodiment shown in the figure.

An embodiment of the rubber material kneading system of the present invention exemplified in FIGS. 1 to 3 includes a closed kneader 1 (hereinafter referred to as a kneader 1), a control unit 12 for controlling the movement of the kneader 1, and predetermined embodiments. It is provided with a calculation unit 13 for inputting the data of the above and performing calculation processing. The control unit 12 and the calculation unit 13 are connected to each other so as to be communicable by wire or wirelessly.

The kneader 1 kneads the unvulcanized rubber material R. The rubber material R is composed of a raw material rubber G and a plurality of types of non-vulcanized compounding agents N, and by kneading the rubber material R, the compounding agent N is evenly dispersed in the raw material rubber G so that the kneaded rubber RF having the target physical properties is obtained. Manufactured. Viscosity can be exemplified as this target physical property.

The raw material rubber G includes natural rubber (NR), isoprene rubber (IR), butadiene rubber (BR), 1,2-polybutadiene, chloroprene rubber, butyl rubber, styrene-butadiene rubber (SBR), and nitrile rubber (acrylic nitrile rubber, (Hydronylated nitrile rubber), ethylene propylene diene rubber and the like can be exemplified. These may be used alone or in combination of two or more. As the non-vulcanized compounding agent N, for example, carbon black, silica, a silane coupling agent, zinc oxide, stearic acid and the like are appropriately used.

The kneading machine 1 includes a kneading chamber 5a, a ram chamber 5b connected to the upper end opening of the kneading chamber 5a and extending upward, a pair of rotors 2 (2A, 2B) arranged in the kneading chamber 5a, and a ram chamber. It has a ram 6 located at 5b. An oil charging section 7 is connected to the kneading chamber 5a, and a rubber charging section 8 and a compounding agent charging section 10 are connected to the ram chamber 5b. A hopper 9 is connected to the upper end of the compounding agent charging section 10. A discharge door 11 that opens and closes is provided on the bottom surface of the kneading chamber 5a.

Each of the rotors 2A and 2B has a rotor shaft 2c and a stirring blade 2d projecting from the rotor shaft 2c. The rotors 2A and 2B (rotor shafts 2c) are arranged to face each other, and the rotor shafts 2c are connected to the drive motors 3 (3A and 3B) via the transmission 4. Each rotor shaft 2c is rotationally driven by drive motors 3A and 3B. It is also possible to configure each rotor shaft 2c to be rotationally driven by the same drive motor 3. The rotation drive and stop of the rotors 2A and 2B (rotor shaft 2c), the rotation speed, and the like are controlled by the control unit 12.

Further, a strain sensor 15 is installed (embedded) in the blade tip portion (radial outer portion) of each stirring blade 2d. The strain sensor 15 and the arithmetic unit 13 are connected to each other so as to be communicable by wire or wirelessly. The strain sensor 15 detects the shearing force generated in the stirring blade 2d from the start to the end of the kneading step based on the deformation of the stirring blade 2d. As the strain sensor 15, a strain gauge or the like that detects rotational strain (torsional strain) of the stirring blade 2d can be used. The shear force data Sf detected by the strain sensor 15 is sequentially input to the calculation unit 13.

In this embodiment, a temperature sensor 14 is further installed (embedded) in the vicinity of the strain sensor 15 at the blade tip portion of the stirring blade 2d. The temperature sensor 14 and the calculation unit 13 are connected to each other so as to be communicable by wire or wirelessly. The temperature sensor 14 sequentially detects the temperature of the rubber material R kneaded in the kneading chamber 5a. More specifically, the temperature change of the rubber material R when the rubber material R is sheared and deformed is detected. Therefore, the separation distance between the strain sensor 15 and the temperature sensor 14 is set to, for example, 10 cm or less, more preferably 5 cm or less. The temperature data Tm detected by the temperature sensor 14 is sequentially input to the calculation unit 13.

Although the control unit 12 and the calculation unit 13 are separately provided in this embodiment, the control unit 12 can also be used as the calculation unit 13. That is, one computer may be configured to function as a control unit 12 and a calculation unit 13.

As illustrated in FIG. 4, the kneading step is composed of a rubber kneading step (S1), a compounding agent uptake step (S2), and a uniform dispersion step (S3). The shear force data Sf and the temperature data Tm in the kneading step are sequentially changed as illustrated in FIG.

A power meter 12a and a tachometer 12b are attached to the control unit 12. The instantaneous electric power required to drive the rotor 2 to rotate is sequentially detected by the wattmeter 12a. The instantaneous electric energy data P1 detected by the wattmeter 12a is input to the control unit 12. The control unit 12 calculates the integrated electric energy amount obtained by integrating the instantaneous electric energy amount, and can grasp the integrated electric energy amount data P2 required for rotationally driving the rotor 2 in an arbitrary kneading period. The rotation speed of the rotor 2 is sequentially detected by the tachometer 12b and input to the control unit 12.

The ram 6 that moves up and down inside the ram chamber 5b can close the upper end opening of the kneading chamber 5a when it moves downward to a predetermined position. The ram 6 is moved up and down by an elevating mechanism such as a hydraulic cylinder. By controlling the vertical movement (vertical position) of the ram 6 by the control unit 12, the ram pressure applied by the ram 6 to the rubber material R charged into the kneading chamber 5a is adjusted.

In order to manufacture the kneaded rubber RF having the target physical characteristics, it is necessary to apply a predetermined amount of shearing force to the rubber material R by each rotor 2. Therefore, in the kneading step, the target value of the required amount of the shear force data Sf for obtaining the kneaded rubber RF having the target physical properties is known. In addition, this shearing force mainly causes the rubber material R to be sandwiched between the blade tip portion of the stirring blade 2d of the rotating rotor 2 and the arcuate wall surface of the kneading chamber 5a (inner wall surfaces on both the left and right sides in FIG. 1). It is given when kneading in a state of being kneaded.

Therefore, the period from the start to the end of the kneading process is set as one evaluation period or a plurality of divided evaluation periods, and the shear force data Sf required to manufacture the kneaded rubber RF having the target physical properties is integrated in each evaluation period. The shear force integration target value ST is set in advance. This shear force integration target value ST is input to and stored in the calculation unit 13. That is, by kneading so that the integrated value of the detected shear force data Sf (shear force actual measurement integrated value SR) reaches the shear force integration target value ST, the kneaded rubber RF having the target characteristics can be obtained.

When the period from the start to the end of the kneading process is set as one evaluation period, the shear force integration target value ST from the start to the end of the kneading process is set. When the period from the start to the end of the kneading step is divided into a plurality of evaluation periods, for example, the rubber kneading step (S1), the compounding agent uptake step (S2), and the uniform dispersion step (S3) are performed. There are three corresponding evaluation periods. That is, the shear force integration target value ST in each of the stages S1, S2, and S3 is set.

The allowable range AS for the preset shear force integration target value ST is also input to and stored in the calculation unit 13. If the shear force actual measurement integrated value SR is within the allowable range AS with respect to the shear force integrated target value ST, the kneaded rubber RF within the allowable range of the target characteristic can be obtained. The shear force integration target value ST and the allowable range AS are grasped by performing a kneading step in advance. The allowable range AS is, for example, about ± 5% of the shear force integration target value ST.

When a shearing force is applied to the rubber material R, the rubber material R undergoes shear deformation. The temperature data Tm of the rubber material R changes with the shear deformation of the rubber material R. The larger the shear deformation (shear force), the larger the change in the temperature data Tm. Therefore, in the kneading step, the target value of the required change amount of the temperature data Tm of the rubber material R due to the shear deformation in order to obtain the kneaded rubber RF having the target physical properties is also known to some extent.

Therefore, the period from the start to the end of the kneading process is set as one evaluation period or a plurality of divided evaluation periods, and the amount of change in the temperature data Tm required to manufacture the kneaded rubber RF having the target physical properties in each evaluation period. The temperature change integrated target value TT, which is the integrated temperature change, is set in advance. This temperature change integration target value TT is input to and stored in the calculation unit 13. That is, the kneaded rubber RF having the target characteristics can be obtained by kneading so that the integrated value of the detected change in the temperature data Tm (temperature change measured integrated value TR) reaches the temperature change integrated target value TT. can.

When the period from the start to the end of the kneading process is set as one evaluation period, the temperature change integrated target value TT from the start to the end of the kneading process is set. When the period from the start to the end of the kneading step is divided into a plurality of evaluation periods, for example, the rubber kneading step (S1), the compounding agent uptake step (S2), and the uniform dispersion step (S3) are performed. There are three corresponding evaluation periods. That is, the temperature change integration target value TT in each of the stages S1, S2, and S3 is set.

The allowable range AT for the preset temperature change integrated target value TT is also input to and stored in the calculation unit 13. If the temperature change measured integrated value TR is within the allowable range AT with respect to the temperature change integrated target value TT, the kneaded rubber RF within the allowable range of the target characteristic can be obtained. The temperature change integration target value TT and the allowable range AT are grasped by performing a kneading step in advance. The permissible range AT is, for example, about ± 5% of the temperature change integration target value TT. Since the change in the temperature data Tm of the rubber material R is the result of the applied shear force, the index for determining the kneading state of the rubber material R is the shear force applied rather than the change amount of the temperature data Tm. It is desirable to preferentially use the amount.

Next, an example of the procedure for kneading the rubber material R by the method for kneading the rubber material of the present invention will be described.

In the kneading step, a predetermined amount of rubber material R (raw rubber G, non-vulcanized compounding agent N, oil, etc.) for one batch is charged into the kneading chamber 5a of the kneading machine 1 of FIG. 1, and the target physical properties (shearing) are charged. The kneaded rubber RF is manufactured by kneading under predetermined kneading conditions (for example, the rotation speed of the rotor 2, the ram pressure, the kneading time, etc. are controlled) so as to set the force integration target value ST).

In the rubber kneading step (S1), as illustrated in FIG. 1, in a state where the ram 6 is held at the standby position at the upper end of the ram chamber 5b, a predetermined amount of the raw material rubber G set in advance is put into the rubber charging section. It is put into the kneading chamber 5a through 8. After that, the ram 6 is moved downward to the lower end of the ram chamber 5b. In this state, the rotor 2 is rotationally driven to knead the raw rubber G and the oil while charging the oil into the kneading chamber 5a through the oil charging section 7.

In the compounding agent uptake stage (S2), the ram 6 is moved to the standby position at the upper end of the ram chamber 5b, and a predetermined amount of the compounding agent N (filler or the like) of a preset type is charged from the hopper 9. It is charged into the kneading chamber 5a through the part 10. After that, the ram 6 is moved downward to the lower end of the ram chamber 5b. In this state, the rotor 2 is rotationally driven to knead the rubber material R as illustrated in FIG.

In the compounding agent uptake stage (S2), the compounding agent N placed on the raw rubber G kneaded with rubber is largely stirred to gradually form a small mass of rubber. Then, the lumps of small rubber gradually grow in size and finally become lumps. In the compounding agent uptake step (S2), the rubber material R is inverted by rotating the rotor 2 with the ram 6 raised to the upper end of the ram chamber 5b several times.

In the uniform dispersion step (S3), the compounding agent N is uniformly dispersed over the entire raw material rubber G. At this stage, the shear force is large at the beginning, but gradually decreases.

When the uniform dispersion step (S3) is completed and the kneading step of the rubber material R for one batch is completed, the discharge door 11 is opened and the kneaded rubber RF is discharged from the bottom surface of the kneading chamber 5a. After that, the same kneading step is sequentially performed on a new batch of rubber material R, and the rubber material R for a plurality of batches is continuously kneaded.

In a series of kneading steps S1 to S3, the shear force data Sf is sequentially detected by the strain sensor 15, and the detected data is sequentially input to and stored in the calculation unit 13. The calculation unit 13 calculates the shear force actual measurement integrated value SR in which the sequentially input shear force data Sf is integrated in each set evaluation period. Then, the kneaded state of the rubber material R is grasped based on the comparison between each shear force measured integrated value SR and the shear force integrated target value ST in the evaluation period corresponding to each shear force measured integrated value SR.

For example, if the shear force actual measurement integrated value SR is within the allowable range AS with respect to the shear force integrated target value ST, the kneading state is good (the rubber material R is sufficiently kneaded at this point) and the calculation unit. It is judged by 13. On the other hand, if the measured shear force integrated value SR is out of the allowable range AS of the shear force integrated target value ST, the kneading state is poor (the rubber material R is not sufficiently kneaded at this point), and the calculation unit 13 Judged by. When the evaluation period is divided into a plurality of parts, for example, if there is at least one evaluation period determined to be in a bad kneading state, the kneading process for one batch is in a bad kneading state. Is judged.

When the shear force data Sf in the kneading process is sequentially detected based on the deformation of the stirring blade 2d, the sequentially detected shear force data Sf is intervened between the drive motor 3 and the rotor 2 due to the loss in the drive motor 3. The loss in the transmission 4 and the like is not included. Therefore, this shear force data Sf can be considered to correspond to the shear force applied to the rubber material R by the rotor 2. Therefore, it becomes possible to more accurately grasp the kneaded state of the rubber material R based on the shearing force data Sf. Along with this, it becomes easy to determine that the rubber material R is in a good kneaded state (a state in which the compounding agent N is widely and evenly dispersed), and in order to stably produce a kneaded rubber RF of a predetermined quality. It will be advantageous.

Further, by using this shear force data Sf, it is possible to largely eliminate the influence of the difference in the kneading machine 1 on the kneading state of the rubber material R. Therefore, it is possible to suppress variations in the quality of the kneaded rubber RF due to the difference in the kneading machine 1. As the shear force data Sf, for example, the average value generated in the stirring blade 2d of each rotor 2 may be adopted, or the higher one of the data may be adopted.

Further, the kneading condition can be controlled by the control unit 12 so that the shear force actual measurement integrated value SR is within the allowable range AS of the shear force integration target value ST corresponding to the shear force actual measurement integrated value SR. That is, in each evaluation period of the kneading process, the rotation speed, ram pressure, kneading time, etc. of the rotor 2 are controlled so that the measured shear force integrated value SR is within the allowable range AS with respect to the shear force integrated target value ST. Then, the kneaded rubber RF having the target characteristics is manufactured.

The temperature data Tm can also be used in the same manner as the shear force data Sf used for grasping the kneading state of the rubber material R and controlling the kneading conditions described above. That is, the temperature data Tm can also be used when grasping the kneading state of the rubber material R and to assist in controlling the kneading conditions.

Therefore, in the series of kneading steps S1 to S3, the temperature data Tm is sequentially detected by the temperature sensor 14, and the detected data is sequentially input to and stored in the calculation unit 13. The calculation unit 13 calculates the temperature change actual measurement integrated value TR in which the sequentially input temperature data Tm is integrated in each set evaluation period. Then, the kneaded state of the rubber material R is grasped based on the comparison between each temperature change measured integrated value TR and the temperature change integrated target value TT in the evaluation period corresponding to each temperature change measured integrated value TR.

For example, if the temperature change integrated value TR is within the allowable range AT with respect to the temperature change integrated target value TT, the kneading state is good (the rubber material R is sufficiently kneaded at this point) and the calculation unit. It is judged by 13. On the other hand, if the temperature change measured integrated value TR is out of the allowable range AT of the temperature change integrated target value TT, the kneading state is poor (the rubber material R is not sufficiently kneaded at this point), and the calculation unit 13 Is judged by. When the evaluation period is divided into a plurality of parts, for example, if there is at least one evaluation period determined to be in a bad kneading state, the kneading process for one batch is in a bad kneading state. Is judged. The judgment based on the shear force data Sf is prioritized over the judgment based on the temperature data Tm.

The temperature data Tm does not include the loss in the drive motor 3 and the loss in the transmission 4 or the like interposed between the drive motor 3 and the rotor 2. Therefore, by using the temperature data Tm in this way, it becomes possible to grasp the kneaded state of the rubber material R more accurately. Along with this, it becomes easier to determine that the rubber material R is in a good kneaded state, and it becomes more and more advantageous to stably manufacture the kneaded rubber RF of a predetermined quality.

Further, by using this temperature data Tm, the influence of the difference in the kneading machine 1 on the kneading state of the rubber material R can be largely eliminated, so that the variation in the quality of the kneaded rubber RF due to the difference in the kneading machine 1 can be suppressed. It will be possible. As the temperature data Tm, for example, an average value generated in the stirring blade 2d of each rotor 2 may be adopted, or one of the higher data may be adopted.

Further, the kneading condition can be controlled by the control unit 12 so that the temperature change measured integrated value TR is within the allowable range AT with respect to the temperature change integrated target value TT corresponding to the temperature change measured integrated value TR. That is, in each evaluation period of the kneading process, the rotation speed, ram pressure, kneading time, etc. of the rotor 2 are controlled so that the temperature change measured integrated value TR is within the allowable range AT of the temperature change integrated target value TT. , Manufacture kneaded rubber RF with target characteristics. The control based on the shear force data Sf is prioritized over the control based on the temperature data Tm.

The strain sensor 15 and the temperature sensor 14 are not limited to the blade tip portion of the stirring blade 2d, but as illustrated in FIG. 6, on the inner wall surface of the kneading chamber 5a facing the blade tip portion of the stirring blade 2d of the rotating rotor 2. It can also be installed. That is, the strain sensor 15 and the temperature sensor 14 can be installed (buried) on the inner wall surfaces on both the left and right sides of the kneading chamber 5a.

When a plurality of batches of rubber materials R having the same specifications are continuously kneaded using the same kneading machine 1, the kneading conditions in the batch in which the kneaded rubber FR having the target physical characteristics is manufactured are set in the kneading step in the next batch. It can also be used as feedback.

When a rubber material R having the same specifications as the rubber material R is kneaded using the same kneading machine 1, the kneading step of the most recent predetermined batch number i in which the kneaded rubber RF having the target physical properties is manufactured using the same kneading machine 1. It is also possible to feed forward and use the kneading conditions in. The predetermined number of batches i is preferably, for example, 10 to 60, and the more preferable number of predetermined batches i is about 20 to 40. If the predetermined number of batches i is less than 10, the variation in each batch cannot be sufficiently leveled. On the other hand, when the predetermined number of batches i exceeds 60, the conditions such as the atmospheric environment (temperature and humidity) change from the rubber material R for one batch to be kneaded this time even if it is the most recently kneaded batch. It is more likely that you are there.

The present invention is applicable not only to the case where the raw material rubber G is kneaded together with the non-vulcanizing compounding agent N. For example, the kneaded rubber RF produced by kneading the raw rubber G and the non-vulcanizing compounding agent N (sulfur, vulcanization accelerator, etc.) and the vulcanizing compounding agent N are kneaded to make the final kneaded rubber. It can also be applied when manufacturing RF.

1 Sealed kneader 2 (2A, 2B) Rotor 2c Rotor shaft 2d Stirring blade 3 (3A, 3B) Drive motor 4 Transmission 5a Kneading chamber 5b Ram chamber 6 Ram 7 Oil charging part 8 Rubber charging part 9 Hopper 10 Mixing agent Input unit 11 Discharge door 12 Control unit 12a Power meter 12b Tachometer 13 Calculation unit 14 Temperature sensor 15 Strain sensor G Raw material rubber N Blending agent R Rubber material RF Kneaded rubber

Claims (10)

A rubber material consisting of raw rubber and a compounding agent is kneaded for each batch in the kneading chamber of a closed-type kneader by rotating a rotor installed in the kneading chamber to produce kneaded rubber having the target physical characteristics. In the kneading method of
Shear force data in the stirring blades constituting the rotor in the kneading step of the rubber material is sequentially detected by a strain sensor installed on the blade tip portion of the stirring blade or the inner wall surface of the kneading chamber facing the blade tip portion. Then, when grasping the kneading state of the rubber material based on the detected shear force data, the period from the start to the end of the kneading step is set as one evaluation period or a plurality of divided evaluation periods, respectively. In the evaluation period, a shear force integration target value that integrates the shear force data necessary for manufacturing the kneaded rubber having the target physical properties is set in advance, and the shear force data in each of the evaluation periods detected sequentially. A method for kneading a rubber material, which is characterized in that the kneading state of the rubber material is grasped based on a comparison between the integrated value of the measured shear force and the target value of the integrated shear force corresponding to the integrated value of the measured shear force. .. The method for kneading a rubber material according to claim 1 , wherein the kneading conditions are controlled so that the measured shear force integrated value is within the allowable range of the shear force integrated target value corresponding to the measured integrated shear force value. 1 . The method for kneading a rubber material according to 2 . In each of the evaluation periods, a temperature integration target value that integrates the temperature data necessary for producing the kneaded rubber having the target physical properties is set in advance, and the temperature data in each of the evaluation periods detected sequentially is used. The method for kneading a rubber material according to claim 3 , wherein the kneaded state of the rubber material is grasped based on a comparison between the integrated temperature measured integrated value and the temperature integrated target value corresponding to the integrated temperature measured integrated value. The method for kneading a rubber material according to claim 4 , wherein the kneading conditions are controlled so that the temperature measured integrated value is within the permissible range of the temperature integrated target value corresponding to the temperature measured integrated value. A kneading chamber in which a rubber material composed of raw rubber and a compounding agent is charged, a rotor arranged in the kneading chamber, a drive motor for rotationally driving the rotor, and an interposition between the rotor and the drive motor. In a rubber material kneading system including a closed kneader equipped with a transmission and a control unit for controlling the movement of the closed kneader.
A strain sensor installed on the blade tip portion of the stirring blade constituting the rotor or the inner wall surface of the kneading chamber facing the blade tip portion and sequentially detecting the shear force data in the stirring blade, and the shear force data sequentially. It has a calculation unit to be input, and the kneading state of the rubber material is determined by the calculation unit based on the shear force data .
The period from the start to the end of the kneading step is regarded as one evaluation period or a plurality of divided evaluation periods, and the shearing force data required for producing the kneaded rubber having the target physical properties in each evaluation period is integrated. The shear force integration target value is input to the calculation unit in advance, and the shear force measurement integrated value obtained by integrating the shear force data in each evaluation period sequentially detected by the strain sensor and the shear force measurement measurement are performed. A rubber material kneading system, characterized in that the kneading state of the rubber material is determined by the calculation unit based on a comparison with the shearing force integration target value corresponding to the integrated value . The rubber material according to claim 6 , wherein the kneading conditions are controlled by the control unit so that the measured shear force integrated value is within the allowable range of the shear force integrated target value corresponding to the measured integrated shear force value. Kneading system. It has a temperature sensor in which the temperature data of the rubber material in the kneading step is arranged in the vicinity of the strain sensor, and the temperature data is sequentially input to the calculation unit by the calculation unit based on the temperature data. The rubber material kneading system according to claim 6 or 7 , wherein the kneading state of the rubber material is determined. In each of the evaluation periods, a temperature integration target value that integrates the temperature data necessary for manufacturing the kneaded rubber having the target physical properties is input to the unit in advance, and each evaluation is sequentially detected by the temperature sensor. Based on the comparison between the temperature measurement integrated value obtained by integrating the temperature data during the period and the temperature integrated target value corresponding to the temperature measured integrated value, the calculation unit determines the kneaded state of the rubber material. The kneading system for rubber materials according to claim 8 . The rubber material kneading system according to claim 9 , wherein the kneading conditions are controlled by the control unit so that the temperature measured integrated value is within the allowable range of the temperature integrated target value corresponding to the temperature measured integrated value.

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