JP2019093585A - Method and apparatus for kneading rubber material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and an apparatus for kneading a rubber material which can more evenly disperse a powdery compounding agent in a raw material rubber by using a closed type kneader without excessively compressing the powdery compounding agent. SOLUTION: Phase data due to rotation of a set of rotors 3 is input to a control unit 12, and the control unit 12 sequentially calculates an area S of a gap 5c between a set of rotors 3 in a top view based on the phase data. Then, based on the size of the area S of the gap 5c calculated sequentially, the raw material rubber G charged into the kneading chamber 5 is adjusted by the control unit 12 while adjusting the vertical position of the ram 6 detected by the position sensor 14. The kneaded product R containing the powdery compounding agent N and the powdered compounding agent N is kneaded by a set of rotating rotors 3. [Selection diagram] Fig. 3

Description

  The present invention relates to a method and an apparatus for kneading a rubber material, and more specifically, a rubber which can disperse a powdery compounding agent more uniformly to a raw rubber without excessive compression using a closed-type kneader The present invention relates to a method and apparatus for kneading materials.

  In manufacturing rubber products such as tires, various rubber members are used. A closed-type kneader (so-called Banbury mixer) is known as an apparatus for kneading a rubber material to be a material of a rubber member. The closed-type kneader has a specification provided with a meshing type rotor in which a pair of rotors are arranged so as to mesh with each other in a kneading chamber (see, for example, Patent Document 1).

  The raw material rubber and the powdery compounding agent introduced into the kneading chamber are kneaded by the rotating rotors while being pressed downward by the ram in a state of closing the upper end opening of the kneading chamber. In the case of meshed rotors, the phase due to the rotation of a pair of rotors causes relatively large fluctuations in the clearance between the rotors and the volume of the receiving space above the rotors. Therefore, if the ram pressure is increased when the gap between the rotors narrows, the powdery compounding agent may be excessively compressed between the rotors. Along with this, the powdery compounding agent solidifies firmly to become a non-breakable mass, and there arises a problem that the raw material rubber can not be uniformly dispersed. Even if they are not meshed rotors, the phase due to the rotation of a pair of rotors causes similar problems if the gap between the rotors and the volume of the receiving space above each other are relatively large.

Unexamined-Japanese-Patent No. 2003-277861

  An object of the present invention is to provide a kneading method and apparatus of a rubber material which can be uniformly dispersed in a raw rubber without excessively compressing a powdery compounding agent by using a closed type kneader. is there.

  A method of kneading a rubber material according to the present invention for achieving the above object comprises a set of a rotor disposed inside a kneading chamber, a kneaded material containing a raw material rubber and a powdery compounding agent, and In a kneading method of a rubber material to be kneaded using a closed type kneader including a ram capable of vertically moving upward and closing an upper end opening of the kneading chamber, phase data by rotation of the pair of rotors is The area of the gap between the pair of rotors is sequentially calculated by the controller based on the phase data, and the area of the gap is sequentially calculated based on the phase data, and the space is calculated based on the size of the sequentially calculated gap. It is characterized in that while adjusting the position in the vertical direction of the ram by the control unit, the kneaded material introduced into the kneading chamber is kneaded by the pair of rotating rotors.

  The apparatus for kneading a rubber material according to the present invention comprises: a kneading chamber into which a kneaded material containing raw material rubber and a powdery compounding agent is introduced; a pair of rotors disposed inside the kneading chamber; In a rubber material kneading apparatus having a closed type kneader including a ram capable of vertically moving upward and closing an upper end opening of the kneading chamber, phase data by rotation of the pair of rotors is input The controller has a control unit and a position sensor for detecting the vertical position of the ram, and based on the phase data, the area of the gap in a top view between the pair of rotors is sequentially calculated by the controller. The kneaded material introduced into the kneading chamber rotates while the vertical position of the ram detected by the position sensor is adjusted by the control unit on the basis of the size of the clearance area sequentially calculated. By the set of rotors Characterized by being configured to be kneaded.

  According to the present invention, the control unit sequentially calculates the area of the gap between the pair of rotors in top view based on the phase data of the rotation of the pair of rotors, and the size of the sequentially calculated gap area The vertical position of the ram can be properly adjusted based on the As a result, when the area of the gap is small, the ram can be moved upward to reduce the ram pressure applied to the kneaded material, and the kneaded material can be passed between the rotors. Therefore, the powdery compounding agent is not excessively compressed between the narrowed rotors, and it is possible to suppress the formation of a firmly solidified lump. Along with this, it becomes advantageous to disperse the powdered compounding agent more uniformly in the raw rubber.

BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing which illustrates the closed type kneader by the longitudinal cross-sectional view of the kneading apparatus of this invention. It is explanatory drawing which expands and illustrates the inside of the kneading chamber of FIG. It is explanatory drawing which illustrates one set of rotors of FIG. 2 by top view. It is a graph which illustrates the phase data of a set of rotors of FIG. 1, and the up-down direction position of a ram. It is explanatory drawing which illustrates the state which knead | mixes a kneaded material by the kneading apparatus of FIG.

  Hereinafter, the method and apparatus for kneading a rubber material of the present invention will be described based on the embodiments shown in the drawings.

  The rubber material kneading apparatus 1 (hereinafter referred to as the kneading apparatus 1) of the present invention illustrated in FIGS. 1 to 3 knead a kneaded material R containing a raw material rubber G and a compounding agent N. In this kneading step, the compounding agent N is uniformly dispersed in the raw rubber G to produce an unvulcanized rubber material having an appropriate viscosity.

  The raw material rubber G and the compounding agent N are appropriately selected depending on the type (characteristics) of the rubber material to be produced. 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), nitrile rubber (acrylonitrile rubber, Hydrogenated nitrile rubber), ethylene propylene diene rubber and the like can be exemplified. These are used individually by 1 type or in combination of 2 or more types. As the compounding agent N, non-vulcanized compounding agents N such as silica and a silane coupling agent, fillers such as carbon black, zinc oxide and stearic acid are appropriately selected and used. An oil is also used as compounding agent N.

  The kneading apparatus 1 has a closed type kneading machine 2. The closed-type kneader 2 includes a kneading chamber 5 into which a kneaded material R containing raw rubber G and a compounding agent N is charged, a pair of rotors 3 disposed inside the kneading chamber 5, and an upper end of the kneading chamber 5. A ram 6 capable of closing the opening 5a, a control unit 12, and a position sensor 14 are provided. The control unit 12 receives phase data by rotation of the rotor 3 and detection data from the position sensor 14. The control unit 12 controls the rotational drive of the rotor 3.

  An oil inlet 7 is provided on the side of the kneading chamber 5, and an outlet door 11 is provided on the bottom. A ram chamber 6 a is connected to the upper end opening 5 a of the kneading chamber 5 and extends upward. The ram 6 moves up and down inside the ram chamber 6 a to apply pressure (ram pressure) to the kneaded material R in the kneading chamber 5. The ram 6 can close the upper end opening 5a of the kneading chamber 5 by moving downward. On the side portion of the ram chamber 6a, a feeding mechanism 8 having a conveying conveyor and the like, and a combination agent feeding unit 10 for feeding the non-vulcanized compounding agent N from the hopper 9 are provided. The feeding mechanism 8 is controlled by the control unit 12 and feeds the raw material rubber G into the kneading chamber 5.

  The kneading apparatus 1 of this embodiment further has a temperature sensor 13. The temperature sensor 13 is provided in the kneading chamber 5 with its tip exposed. The temperature sensor 13 sequentially detects the temperature of the kneaded material R (raw rubber G) being kneaded in the kneading chamber 5, and the detection data is input to the control unit 12.

  The position sensor 14 installed in the ram 6 sequentially detects the vertical position of the ram 6, and the detection data is input to the control unit 12. When the ram 6 is positioned further downward, the ram pressure applied to the kneaded material R (raw material rubber G) in the kneading chamber 5 becomes larger, and when the ram 6 is positioned further upward, the kneaded material R in the kneading chamber 5 (raw material The ram pressure applied to the rubber G) is smaller.

  Although various sensors can be used for the position sensor 14, for example, various sensors such as an optical sensor or a laser sensor that detects the vertical distance between the lower surface of the ram 6 and the uppermost position of the kneaded material R of the kneading chamber 5 Can be used. Alternatively, the vertical distance between the upper surface of the ram 6 and the upper surface of the ram chamber 6a, the vertical distance between the lower surface of the ram 6 and the upper opening 5a of the kneading chamber 5, or the amount of vertical movement of the column connected to the upper surface of the ram 6. Various sensors can be used to detect

  A power meter 12 a is attached to the control unit 12. The instantaneous power P required for the rotational driving of the rotor 3 is sequentially detected by the power meter 12 a, and the detection data is input to the control unit 12. The control unit 12 calculates the integrated power amount obtained by integrating the instantaneous power, and can grasp the power amount (load acting on the rotor 3) required for the rotational drive of the rotor 3 in an arbitrary kneading period. The rotational speed (rotational speed) of the rotor 3 and the like are also input to the control unit 12, and the vertical movement of the ram 6, the rotational speed of the rotor 3 and the like are controlled by the control unit 12.

  Each of the rotors 3 has a rotating shaft 4a disposed in parallel with each other, and a stirring blade 4b provided so as to protrude from the outer peripheral surface of the rotating shaft 4a. A so-called meshing type rotor 3 is disposed so that the outer peripheral surfaces of the rotors 3 mesh with each other. The specifications (the shape and the like of the outer peripheral surface) of the outer peripheral surface of each rotor 3 are appropriately set according to the type of the kneaded material R and the like.

  The above-mentioned phase data is data of the rotation angle (the rotated position) of each rotor 3. When each rotor 3 makes one rotation (360 ° rotation), as illustrated in FIG. 4, the volume V of the receiving space 5 b in the upper part between the rotors 3 (curve V shown by a solid line) and the clearance in top view between the rotors 3 The area S of 5c (curve S shown by a broken line) fluctuates. The fluctuation of the volume V of the receiving space 5 b and the area S of the gap 5 c is repeated for each rotation of the respective rotors 3.

  The receiving space 5 b is located above the rotor 3 and is a space in which the kneaded material R introduced into the kneading chamber 5 is disposed first. As illustrated in FIG. 2, a space between the rotors 3 and surrounded by the upper end opening 5 a of the kneading chamber 5 and the outer peripheral surface of each of the rotors 3 is a receiving space 5 b.

  The area S of the gap 5c between the rotors 3 in a top view is the area of the top view between the outer peripheral surfaces of the respective rotors 3A and 2B in the kneading chamber 5. In FIG. 3, the area S of the gap 5c is illustrated by the hatched portion.

  In this embodiment, as illustrated in FIG. 4, the volume V of the receiving space 5b becomes the minimum value Vn (minimum volume) when the rotor 3 rotates 90 ° from a certain position, and the receiving space 5b rotates 180 °. Becomes the maximum value Vx (maximum volume). The area S of the gap 5c becomes the maximum value Sx (maximum area) when the respective rotors 3 rotate 30 degrees from the position, and becomes the minimum value Sn (minimum area) when the rotor 3 rotates 110 degrees. When the volume V of the receiving space 5b reaches the maximum value Vx due to the rotation of the respective rotors 3, the area S of the gap 5c is in an increasing state and then reaches the maximum area. Such fluctuation of the volume V and the area S is repeated every half rotation (180 ° rotation) of each rotor 3. The variation of the volume V of the receiving space 5b and the area S of the gap 5c varies depending on the specifications of the outer peripheral surface of the respective rotors 3 and is not limited to that illustrated in FIG. The present invention can also be applied to cases where the volume V and the area S change in various ways other than that illustrated in FIG.

  Since the specifications (the outer peripheral surface shape and the like) of each rotor 3 are known, if the phase of each rotor 3 is known, it is possible to grasp the volume V of the receiving space 5b and the area S of the gap 5c at any time. Therefore, in the present invention, phase data by rotation of a set of rotors 3 is input to the control unit 12, and the control unit 12 sequentially calculates the area S of the gap 5c based on the input phase data. Further, in this embodiment, the volume V of the receiving space 5b is sequentially calculated by the control unit 12 based on the input phase data.

  The means for acquiring phase data is not particularly limited. For example, the rotational speed (rotational position) of the rotation shaft 4a of each rotor 3 can be detected by a known sensor or the like, and phase data can be obtained (calculated) based on the detection data.

  Hereinafter, an example of the kneading method of the rubber material of the present invention will be described.

  As illustrated in FIG. 1, when the raw material rubber G and the powdery compounding agent N are put into the kneading chamber 5 and the kneaded material R is kneaded, the ram 6 is held at the standby position at the upper end of the ram chamber 6a. In the above state, a predetermined amount of raw material rubber G set in advance is introduced into the kneading chamber 5 using the introduction mechanism 8. A predetermined amount of compounding agent N (filler and the like) of a predetermined type is introduced from the hopper 9 into the kneading chamber 5 through the compounding agent introduction unit 10. Further, the oil is appropriately introduced into the kneading chamber 5 through the oil introduction unit 7.

  Thereafter, as illustrated in FIG. 5, the ram 6 is moved to the lower side of the ram chamber 6a to close the upper end opening 5a. In this state, the respective rotors 3 are rotationally driven to adjust the vertical position of the ram 6, the number of rotations of the rotor 3 and the like, and the kneading is performed while detecting the temperature of the kneaded material R, the vertical direction position of the ram 6 and the electric energy. Knead thing R. As a result, the compounding agent N is uniformly dispersed in the raw rubber G to produce an unvulcanized rubber material having an appropriate viscosity. The unvulcanized rubber material produced is discharged from the open discharge door 11 to the outside of the internal mixer 2. In the next step, the discharged rubber material is compounded and kneaded at a predetermined ratio with a vulcanizing compounding agent such as sulfur and a vulcanization accelerator.

  In the present invention, when kneading the kneaded material R, phase data of the rotating pair of rotors 3 is sequentially detected and input to the control unit 12. The control unit 12 sequentially calculates the area S of the gap 5c in top view between the rotors 3 based on the input phase data. The control unit 12 sequentially receives the vertical position of the ram 6 detected by the position sensor 14. Therefore, the kneaded material R is kneaded while adjusting the vertical position (vertical position detected by the position sensor 14) of the ram 6 by the control unit 12 based on the size of the area S of the clearance 5c calculated sequentially.

  As exemplified in FIG. 4, when the area S of the gap 5c calculated sequentially is in an increasing state (the curve S in FIG. 4 is in the upper right), as illustrated by the dashed dotted line P in FIG. Move 6 further downward to adjust to increase ram pressure. On the other hand, when the area S of the gap 5c which is sequentially calculated is in a decreasing state (the curve S in FIG. 4 is in the downward sloping state), the ram 6 is moved upward as illustrated by the one-dot chain line P in FIG. Make adjustments to reduce ram pressure.

  In this manner, control is performed such that the ram 6 is disposed at the lower position as the area S of the gap 5c calculated successively is larger, and the ram 6 is arranged at the upper position as the area S of the gap 5c calculated successively is smaller. Thereby, when the area S of the clearance 5c calculated sequentially is the largest area Sx, the ram pressure is maximized by arranging the ram 6 at the lowermost position. On the other hand, when the area S of the gap 5c calculated sequentially is the minimum area Sn, the ram 6 is moved upward as much as possible to minimize the ram pressure. For example, when the area S of the gap 5c calculated sequentially is the minimum area Sn, the ram 6 is moved upward to a position not in contact with the mixture R in the mixing chamber 5.

  According to the present invention, by sequentially calculating the area S of the gap 5c between the pair of rotors 3 in top view between the pair of rotors 3 based on the phase data, the size of the area S of the gap 5c sequentially calculated The vertical position (ram pressure) of the ram 6 can be appropriately adjusted based on the height. Thus, when the area S of the gap 5c is small, the ram pressure applied to the kneaded material R can be reduced, and the kneaded material R can be passed between the rotors 3.

  Therefore, excessive compression of the powdery compounding agent N between the narrowed rotors 3 is prevented, and the powdery compounding agent N can be suppressed from being firmly solidified into a lump. Along with this, it is advantageous to disperse the powdery compounding agent N more uniformly in the raw rubber G.

  On the other hand, when the area S of the gap 5c is large, the ram 6 can be moved further downward, the ram pressure applied to the kneaded material R can be further increased, and the kneaded material R can be passed between the rotors 3. Therefore, it is advantageous to perform kneading for dispersing the powdery compounding agent N more uniformly in the raw material rubber G in a shorter time without excessively compressing the powdery compounding agent N between the rotors 3.

  There is also an advantage that the load acting on the rotationally driven rotor 3 can be reduced by reducing the ram pressure applied to the kneaded material R passed between the narrowed rotors 3. Along with this, it is advantageous to reduce the amount of power required to rotationally drive the rotor 3.

  Test kneading is performed before kneading the kneaded product R in the production line, and it is possible to prevent the powdery compounding agent N passing between the rotors 3 from becoming a firmly solidified lump (vertical position of the ram 6 It is preferable to grasp the correlation between the pressure) and the size of the area S of the gap 5c. And when knead | mixing the kneaded material R and mass-producing an unvulcanized rubber material, it is desirable to adjust the up-down direction position of the ram 6 by the control part 12 using this grasped | ascertained correlation.

  The present invention is particularly useful when the pair of rotors 3 is of the meshing type, since the variation in the volume V of the gap 5c between the rotors 3 with each other and the receiving space 5b above between the rotors 3 is relatively large. However, even if one set of rotors is non-engaging, if the gap between the rotors and the variation of the volume of the receiving space above each other are relatively large due to the phase due to the rotation of the pair of rotors, The present invention can be applied.

  Powdered silica has a low bulk density, so it is likely to be over-compressed in the closed type kneader 2, and if over-compacted, it tends to solidify strongly and to become a hard crush. Therefore, when the kneaded material R contains silica as the powdery compounding agent N, the present invention is particularly advantageous.

  The present invention is also applicable to the case where a certain kneaded material R is continuously kneaded in a plurality of batches. In this case, for example, the vertical movement control of the ram 6 in the kneading can also be performed based on the vertical movement control (vertical position data) of the ram 6 in the batch kneaded before the kneading. When a certain kneaded material R is continuously kneaded in a plurality of batches, the upper end position of the kneaded material R filled in the kneading chamber 5 in each batch does not largely change. Therefore, if the kneaded material R of the batch that has been kneaded one time before the kneading, if the powdery compounding agent N is appropriately kneaded without being excessively compressed, as in the case of kneading in the batch, By controlling the vertical movement, the rubber material R can be appropriately kneaded.

  The present invention can also be applied to the case where the kneaded material R having the same composition as the kneaded material R to be kneaded this time is kneaded before. In this case, for example, vertical movement control of the ram 6 in the current kneading is performed based on vertical movement control (vertical position data) of the ram 6 in the previous kneading. If the kneaded material R is properly kneaded without excessive compression of the powdery compounding agent N by the previous kneading, the kneading is appropriately performed by controlling the vertical movement of the ram 6 in the same manner as the kneading previously. The substance R can be kneaded.

  The raw material rubber G introduced into the kneading chamber 5 is more easily bitten into the rotor 3 when the volume V of the receiving space 5 b is large. Therefore, when the volume V of the receiving space 5b sequentially calculated by the control unit 12 becomes equal to or greater than the preset reference value Vc, the control unit 12 operates the feeding mechanism 8 to load the raw material rubber G into the kneading chamber 5 It is good to do.

  In this embodiment, as illustrated in FIG. 4, when the volume V of the receiving space 5 b becomes equal to or greater than the reference value Vc (when the rotor phase is in the range indicated by the symbol T of about 180 °), the raw material rubber G is used. It is good to put in the kneading chamber 5. The raw material rubber G can be fed into the kneading chamber 5 all at once, or can be fed into the kneading chamber 5 by dividing into plural portions. In the kneading chamber 5, the input raw rubber G is placed on the rotor 3 with each other in the receiving space 5b, and while being pressed downward by the ram 6, it is gradually bitten between the rotating rotors 3 Is kneaded.

  As described above, the timing at which the raw material rubber G is introduced into the kneading chamber 5 by the control unit 12 based on the phase data is when the volume V of the receiving space 5b becomes equal to or greater than the preset reference value Vc (that is, the volume V is Can also be controlled at relatively large times). As a result, when the raw material rubber G tends to bite into the rotor 3, the raw material rubber G can be introduced into the kneading chamber 5. The raw material rubber G is bitten into the space between the rotors 3 more quickly, which is advantageous for efficiently kneading the raw material rubber G in a shorter time. As a result, it contributes to the improvement of the productivity of the unvulcanized rubber material obtained by kneading the raw material rubber G and the compounding agent N.

  In order to make the raw rubber G introduced into the kneading chamber 5 easy to bite into the rotor 3, the reference value Vc receives 10% of the fluctuation value D obtained by subtracting the minimum volume Vn from the maximum volume Vx of the receiving space 5b. It is good to set to the value which deducted from the maximum volume Vx of the space 5b (Vc = Vx-Dx10%). The reference value Vc is more preferably set to a value obtained by subtracting 5% of the fluctuation value D from the maximum volume Vx of the receiving space 5b (Vc = Vx−D × 5%), and further preferably 1 of the fluctuation value D. % Is set to a value obtained by subtracting the maximum volume X of the receiving space 5b (Vc = Vx−D × 1%).

  Furthermore, it is preferable to charge the raw material rubber G into the kneading chamber 5 when the area S of the gap 5c calculated successively is in an increasing state. When the area S of the gap 5c is in an increasing state, the raw material rubber G in the receiving space 5b is pushed downward by the ram 6 and easily passes between the rotors 3, so It becomes easy to be swallowed, and it is more advantageous to knead the raw material rubber G efficiently in a short time.

  The raw material rubber G can be charged into the kneading chamber with the rotor 3 kept rotating, but the rotation of the rotor 3 can be stopped when the raw rubber G is charged into the kneading chamber 5. As a result, when the volume V of the receiving space 5c becomes equal to or greater than the preset reference value Vc, it is advantageous to reliably feed the raw rubber G into the kneading chamber 5.

  The present invention is also applicable to the case where the raw material rubber G and the compounding agent N, which have been previously kneaded, are added together and kneaded. The present invention can also be applied to the case where the vulcanized compounding agent N is kneaded with the kneaded product R in which the non-vulcanized compounding agent N is kneaded with the raw rubber G.

  The raw material rubber and a predetermined amount of powdery silica were put together into a kneading chamber and kneaded using a device similar to the closed type kneader illustrated in FIGS. 1 to 5. As shown in Table 1, only the presence or absence of adjustment of the vertical position of the ram (adjustment of the ram pressure applied to the raw material rubber and the mixture of silica) is made different in two ways (Cases 1 and 2). The size of the load acting on the rotating rotor was confirmed. Case 1 increases the ram pressure by moving the ram downward when the area of the gap in a top view between the rotors is in an increasing state, and the ram moves upward when the area is in a decreasing state. Adjustment was made to reduce the pressure. The ram was placed at the bottom when this area was at maximum. Case 2 was always placed at the lowermost position without adjusting the vertical position of the ram.

  The dispersibility of the silica confirmed the number of the strongly solidified and lumped silica in the raw material rubber after kneading, and in Table 1, the index was evaluated with the case 1 as the index 100 as a standard. The smaller the index value is, the smaller the number of silica lumps, and the better the dispersibility, as the silica is uniformly dispersed.

  The magnitude of the load acting on the rotor was index-evaluated in Table 1 with Case 1 as the reference index 100. The smaller the index value, the smaller the load.

  From the results in Table 1, it can be seen that Case 1 is superior to Case 2 in the dispersibility of silica. Also, it can be seen that Case 1 has a smaller load acting on the rotating rotor than Case 2 and is effective for energy reduction.

Reference Signs List 1 kneader 2 closed type kneader 3 rotor 4a rotary shaft 4b stirring blade 5 kneading chamber 5a upper end opening 5b receiving space 5c gap 6 ram 6a ram chamber 7 oil feeding unit 8 feeding mechanism 9 hopper 10 combination agent loading unit 11 discharging door 12 Control unit 12a Power meter 13 Temperature sensor 14 Position sensor G Raw rubber N Compounding agent R Kneaded

Claims (12)

It is possible to move up and down a pair of rotors disposed inside the kneading chamber and the upper side of the kneading chamber by closing the upper end opening of the kneading chamber containing a raw material rubber and a powdery compounding agent. Method of mixing rubber materials using a closed type kneader equipped with
The phase data by rotation of the set of rotors is input to the control unit, and the area of the gap in top view between the set of rotors is sequentially calculated by the control unit based on the phase data, and the calculation is sequentially performed The kneaded material introduced into the kneading chamber is kneaded by the pair of rotating rotors while the vertical position of the ram is adjusted by the control unit based on the size of the area of the gap. Method of mixing rubber materials.   The method for kneading a rubber material according to claim 1, wherein the one set of rotors is a meshing type rotor arranged so that the outer peripheral surfaces thereof mesh with each other.   The ram is moved downward when the area of the clearance calculated sequentially is in an increase state, and the movement of the ram is performed upward when the area of the clearance calculated sequentially is in a reduction state. A method of kneading a rubber material according to claim 1.   The volume of the receiving space above the pair of rotors is sequentially calculated by the control unit based on the phase data, and the volume of the receiving space calculated sequentially becomes equal to or greater than a preset reference value. The method for kneading a rubber material according to any one of claims 1 to 3, wherein a raw material rubber and the compounding agent are introduced into the kneading chamber.   The method for kneading a rubber material according to any one of claims 1 to 4, wherein the compounding agent contains at least silica.   When a plurality of batches of the kneaded material are continuously kneaded, the up and down movement control of the ram in the kneading is performed based on the up and down movement control of the ram in the batch kneaded before the kneading. The mixing | blending method of the rubber material in any one of -5.   When a kneaded material having the same composition as the kneaded material to be kneaded this time is kneaded before, the up and down movement control of the ram in the current kneading is performed based on the up and down movement control of the ram in the previous kneading. The kneading method of the rubber material in any one of Claims 1-5. A kneading chamber into which a kneaded material containing raw material rubber and powdery compounding agents is charged, a pair of rotors disposed inside the kneading chamber, and moving up and down above the kneading chamber, the kneading chamber In a rubber material kneading apparatus having a closed type kneader provided with a ram capable of closing an upper end opening,
A control unit to which phase data due to rotation of the one set of rotors is input, and a position sensor for detecting the position of the ram in the vertical direction, and between the one set of rotors by the control unit based on the phase data The area of the gap in a top view is sequentially calculated, and the vertical position of the ram detected by the position sensor is adjusted by the control unit based on the size of the area of the gap sequentially calculated. A kneading apparatus for a rubber material, wherein the kneading material introduced into the kneading chamber is kneaded by the pair of rotating rotors.   9. The rubber material kneading apparatus according to claim 8, wherein the one set of rotors is a meshing type rotor arranged so that the outer peripheral surfaces thereof mesh with each other.   The ram is moved downward when the sequentially calculated area of the gap is in an increasing state, and the ram is moved upward when the successively calculated area of the gap is in a decreasing state. Or the kneading | mixing apparatus of the rubber material as described in 9.   When the volume of the receiving space above the pair of rotors is sequentially calculated by the control unit based on the phase data, and the volume of the receiving space calculated sequentially becomes equal to or greater than a preset reference value The rubber material kneading apparatus according to any one of claims 8 to 10, wherein the raw material rubber and the compounding agent are charged into the kneading chamber.   The rubber material kneading apparatus according to any one of claims 8 to 11, wherein at least silica is contained as the compounding agent.

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