JPH06285350A - Closed kneader - Google Patents

Abstract

PURPOSE:To sufficiently micronize and knead a material by exerting an optimum shearing force on the material and to improve the biting capacity when the material is fed. CONSTITUTION:A couple of two bladed rotors 4 parallel to each other are rotatably inserted into a chamber 3 having a material inlet 5 and an outlet 7, and the blades 10 of the rotors 4 are engaged with each other to constitute a closed kneader 1. A constant clearance C is kept between the operating surfaces 10A of both engaged blades 10 on a straight line G connecting the axial centers O of both rotors.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blade type meshing type (batch type) kneader used for kneading a polymer material such as a rubber material.

[0002]

2. Description of the Related Art Generally, a polymer material, which is a raw material for tire products and general industrial products, is mixed with a compounding agent such as carbon or an oil during a process called a masterbatch for uniform physical properties of different materials. A closed kneader is used. There are a tangential type and an intermeshing type in this kind of closed type kneader, and as the intermeshing type kneader, those exemplified in FIGS. 7 to 10 are known.

A kneading machine (conventional example 1) shown in FIG. 7 is disclosed in Japanese Utility Model Laid-Open No. 63-136908, and has a kneading chamber 22 inside which is closed by a casing 21 and an end frame (not shown). A pair of bladed rotors 23 are arranged in the chamber 22 so as to be parallel to each other and rotatable in opposite directions, and a communicating portion 24 is formed between the rotors 23 over the entire length of the chamber 22. , In the center of the chamber 22 corresponding to the communication portion 24,
The material supply popper 25 is formed on the upper side so that the material pushing ram 26 can be freely inserted and removed, and the discharge port 2 for the kneaded material is provided on the lower side.
7 is provided so that the door 28 can be inserted and removed freely.

Although not shown, the rotor 23 is provided with a main wing and an auxiliary wing, and the auxiliary wing is arranged at the center of the rotor so as to be able to synchronize with the main wing of the counterpart rotor. The kneading machine (conventional example 2) shown in FIG.
The main configuration is the same as that of the conventional example 1 in FIG. 7, but a plurality of pins 29 are arranged on the body blades of both rotors 23 to take in the material into the chamber 22. I try to increase the ability (feeding ability).

A kneading machine shown in FIGS. 9 and 10 (conventional example 3)
Is disclosed in Japanese Examined Patent Publication No. 63-1093, and its main configuration is the same as that of the conventional example 1 in FIG.
The ratio of the length L to the chamber inner diameter D is 1.25 ± 0.1,
The ratio of the length 1 of the main wing 30 to the rotor length L is 0.5 to 0.
7. The ratio of the length a of the bladeless part to the rotor length L is 0.1.
5 to 0.35, the blade twist angle θ is 55 ° ± 5 °, and the ratio between the tip clearance S and the chamber inner diameter D is 0.0275.
It is set to ± 0.0075, and it is intended to make the temperature distribution uniform and accelerate the heat transfer by accelerating the movement of the material.

It is said that the intermeshing type kneading machine is inferior in productivity to the tangential kneading machine, and is designed based on the ratio (S / D) of the tip clearance S and the chamber inner diameter D. Therefore, the material shearing force between the rotors 23 is restricted by the ratio (S / D).

[0007]

In the above-mentioned prior art, the material digging ability is inferior to that of the tangential type kneader. This is due to the small gap between the rotors, but it is necessary for the material digging. If the time, that is, the ram sheet time is increased, there is a problem that the time for kneading all the input materials in the chamber is shortened and the variation between batches is increased. To overcome this problem, it is necessary to subdivide the material faster between the rotor and the chamber or between both rotors.

In Conventional Example 1, since the rotors have a small number of meshing portions that rotate with clearance, the subdivision capability between the rotors is poor. Further, in Conventional Example 2, pin 2
Since 9 is provided, the biting ability of the material can be improved to some extent, but the pin 29 causes the material to flow in the axial direction and the direction of the mating rotor in the subdivision of the material after the biting of the material and the carbon dispersion process. Hinders the formation of stagnant parts,
There is a great possibility that the material kneading becomes non-uniform due to partial internal heat generation.

Further, in Conventional Example 3, since the blade portion has a large helix angle, the material flow between the left and right chambers is small, and the ratio (S / D) between the tip clearance S and the chamber inner diameter D cannot be reduced. , A large shear force between the rotor and the chamber cannot be expected, and it is not possible to reduce the clearance between the blade and the opposing rotor due to the need to secure the ability to bite the material. Is small, and the material subdivision ability is poor.

Further, in the prior art, in order to realize the low temperature kneading, the width of the blade is increased to design the cooling area of the rotor to be large, and the ratio of the tip clearance S to the chamber inner diameter D (S / D). Is increased and the generation of shearing force is decreased to suppress power consumption, and dispersibility is difficult even when kneading at low temperature is possible. The present invention has been made in view of the above circumstances, and an object thereof is to give an optimum shearing force to a material to enable subdivision and a sufficient kneading action, and also to prevent the feeding at the time of feeding the material. An object is to provide a closed kneading machine capable of improving the mixing capacity.

[0011]

In order to achieve the above object, the present invention takes the following technical means. That is, according to the present invention of claim 1, a chamber having a material supply port in an upper part and a discharge port in a lower part, each port being closed and hermetically sealed, and a chamber capable of being parallel to each other and rotatable. In a hermetic kneader comprising two pairs of bladed rotors arranged in a pair, the blades of the rotors meshing with each other, the blades of the rotors face each other when meshing with each other. It is characterized in that the working surface is formed so as to maintain a constant gap on a straight line connecting the shaft centers of both rotors.

Further, the invention of claim 2 has a chamber having a material supply port in the upper part and a discharge port in the lower part, and each port is closed so as to be hermetically sealed; A hermetically-sealed kneading machine comprising a pair of rotatably arranged bladed rotors, the blades of both rotors meshing with each other, and facing the peripheral surface of the blades of each rotor. The distance between the facing surfaces on the straight line connecting the rotor body and the rotor body peripheral surface is constant, and the ratio of the distance between the facing surfaces and the distance between the rotor shafts is 0.01 to.
It is characterized in that it is set within the range of 0.04.

[0013]

According to the present invention, a constant optimum shearing force acts on the material even between the two rotors, and the kneading performance of the material is improved. In addition, when materials that are not introduced into the chamber at the material supply port of the chamber and the lower part of the chamber at the time of material introduction are sequentially taken in and appropriately subdivided at the meshing parts of both rotors, a compounding agent other than the main material However, it adheres more quickly to the finer main material, speeds kneading, greatly improves the material feeding ability, and shortens the material uptake time.

Therefore, the time for simultaneously kneading all the input materials in the chamber becomes longer than the kneading time required for one kneading step, that is, the time for which the material is taken into the chamber becomes short, and each batch (one step) There is no variation in the kneading state, and the kneading performance is improved. Also,
According to the second aspect of the present invention, the distance between the facing surfaces of the rotors and the distance between the rotor shafts are set so that a required physical property value (for example, Mooney value) can be obtained according to the type of the material to be kneaded. Optimum shearing force can be set by arbitrarily selecting the ratio with the distance within the range of 0.01 to 0.04, and the shearing force acting part due to the tip clearance between the blade tip and the chamber wall surface, The ratio of the shear force between the rotors and the acting portion can be optimally changed.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of the present invention according to claim 1, which is a kneading machine 1
Is a kneading chamber 3 closed by a casing 2 and an end frame (not shown), and a pair of bladed rotors 4 fitted in the chamber 3 so as to be rotatable in parallel and in opposite directions. A material pushing ram 6 which can be inserted into and removed from a material supply port 5 provided in the upper center of the chamber 3, and an opening and closing door 8 which can be inserted into and removed from a kneaded material discharge port 7 provided in the lower center of the chamber 3. Consisting of the ram 6 and the door 8
The chamber 3 can be closed or opened by.

The casing 2 is provided with a communicating portion 9 so that both rotors 4 communicate with each other over the entire length of the casing 2, and between the outer peripheral end surface 11 of the blade portion 10 of each rotor 4 and the inner wall surface of the chamber 3. A constant gap, that is, a tip clearance S is formed. Each rotor 4
As described above, the wing portion 10 (also referred to as a tip portion)
Of the rotor shaft of the opposing action surface 10A when the blades 10 are meshed with each other while protruding from each other with a predetermined twist angle and arranged in the chamber 3 in parallel with each other. The gap C between the facing surfaces on the straight line G connecting the centers O is designed to be constant.

The shaft portion 4A of each rotor 4 is rotatably and liquid-tightly supported by an end plate (not shown) through a seal material and a bearing. In the first embodiment, the fixed amount of the material and the compounding agent fed from the material supply port 5 are pushed by the pushing ram 6 between the rotors 4 rotating in opposite directions, and taken into the chamber 3.
When all the materials have been pushed into the chamber 3 by the ram 6, the blades 10 of both rotors 4 start uniform kneading of the entire material. A certain optimum shearing force acts on the material between the tip clearance S with the chamber 3 of the rotor 4 and the working surface 10A of the blade 10 that meshes with the material.
The kneading performance of the material is improved by the subdivision.

Further, the material supply port 5 of the chamber 3 at the time of material introduction and the material below it, which has not been taken into the chamber 3, are sequentially taken in and appropriate at the meshing portion between the rotors 4 (between the working surfaces 10A). When subdivided into, the compounding agent other than the main material (for example, rubber) adheres more quickly to the finely divided main material, speeds kneading, and significantly improves the material feeding ability, which is necessary for material intake. The time gets shorter.

Therefore, the entire amount of the input material is supplied to the chamber 3.
The time for kneading at the same time is longer than the kneading time required for 1 step (1 batch) of kneading, and 1 batch (1 step)
The kneading state does not vary and the kneading performance is improved. When the kneading operation is completed, the door 8 is opened, the pushing ram 6 is extracted, and the kneaded material, that is, the kneaded material is taken out from the discharge port 7.

FIGS. 2 and 3 show the results of kneading tests of the rubber material (NBR) and carbon by the kneading machine 1 of the above-mentioned example and the conventional kneading machine. The filling rate and the ram sheet time ( As is clear from the relationship diagram with the time required to take all the materials into the chamber), the ram sheet time of the embodiment of the present invention is shortened over the filling rate of substantially the entire region. In addition, the Mooney viscosity HS with respect to the filling rate shown in FIG.
At 1 + 4 (100 ° C.), when the same specific energy was applied, the example of the present invention was lower than the conventional example over the filling rate of the entire region, and good results were obtained.

FIG. 4 shows the second embodiment of the present invention, which has the same structure as the kneading machine shown in FIG. 1, but the rotor body portion which faces the outer peripheral end surface 11 of the blade portion 10 of each rotor 4, respectively. The distance d between the facing surfaces on the straight line G connecting the rotor shaft center O with the circumferential surface 4A is constant, and the ratio (d / A) between the distance d between the facing surfaces and the shaft distance A of both rotors 10 is 0.01-0.0
The difference is that it is set within the range of 4.

According to the embodiment, the ratio (d / A) is 0.01 to 0.01 in correspondence with the required physical properties of the kneading material.
By arbitrarily selecting and setting within the range of 0.04, the blade outer peripheral end face 11 has a large width for the reason that the cooling efficiency is increased in the meshing type. A good kneading action of the material can be expected by the optimal shearing force and subdivision between the peripheral surfaces 4A.

Therefore, the ratio of the kneading action between the blade portion 10 and the inner peripheral wall surface of the chamber 3 and between the rotor body peripheral surface 4A and the outer peripheral end surface 11 of the blade portion is arbitrarily and optimally changed according to the kneading purpose. Since it is possible and the material can be subdivided by obtaining the optimum shearing force, improvement in the biting property (ability) of the material can be expected. The ratio (d / A) is 0.01 to 0.0.
The reason for setting to 4 is that when (d / A) is 0.01 or less, the biting property of the material becomes poor and the distance d between the facing surfaces is d.
Is smaller, heat generation becomes larger, and the characteristic of the meshing type kneading machine capable of kneading materials sensitive to temperature rise due to expected shearing force cannot be utilized, and (d /
When A) is 0.04 or more, the distance d between the facing surfaces, that is, the space becomes large, so that a material retention portion may occur, and further, the shearing force becomes small and the kneading becomes insufficient.

5 and 6 show the rubber material (NBR) and carbon in the ratio (d / A) of 0.018 and 0.03.
The results of a kneading test using the respective kneaders of 0 and 0.045 are shown. FIG. 5 shows the relationship between the specific energy and the Mooney viscosity MS1 + 4 (100 ° C.), and it is clear that a kneaded product having a low Mooney value can be obtained, and it is also appropriate from the relationship between the filling rate and the lamb sheet time shown in FIG. It is clear that a good biting property is obtained.

The present invention is not limited to the above-mentioned embodiment, and for example, the present invention of claim 1 can be applied to the present invention of claim 1.

[0026]

According to the first aspect of the present invention, in the hermetic kneading machine, the blades of both rotors have a constant gap on the straight line connecting the shaft centers of the rotors when the blades of the rotors are in mesh with each other. Since it is formed so that a constant shearing force can be obtained not only between the rotor blade portion and the chamber inner wall surface but also between the opposing working surfaces, the material subdivision ability and the feeding ability and the material kneading performance are improved. However, it is possible to eliminate variations in the kneading state between batch processes.

According to a second aspect of the present invention, in the hermetic kneader, the distance between the facing surfaces on the straight line connecting the rotor body peripheral surfaces facing the peripheral surfaces of the rotor blades and the rotor shaft centers is constant. Moreover, since the ratio of the distance between the facing surfaces and the distance between both rotor shafts is set within the range of 0.01 to 0.04, the kneading action by the shearing force between the rotor blade portion and the chamber inner wall surface In addition, optimum shearing force can be obtained between the rotor blade peripheral surface and the rotor body peripheral surface to improve the material subdivision, biting ability and kneading performance, and to improve the kneading state between batch processes. It can be lost.

Further, according to the present invention of claim 2, the ratio of the distance between the facing surfaces of the rotor blade peripheral surface and the rotor body peripheral surface to the rotor shaft distance is determined by the required physical property value of the kneading material. Can be arbitrarily selected in order to obtain the above, and the action part of the shear force composed of the rotor blade part and the inner wall surface of the chamber, and the action part of the shear force between the rotor blade part and the peripheral surface of the opposite rotor body part The ratio can be set optimally and the adaptability to various materials can be expanded.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention according to claim 1.

FIG. 2 is a graph showing the relationship between the material filling rate and the ram sheet time in the material kneading test of the same example and the conventional example.

FIG. 3 is a graph showing the relationship between the material filling rate and the Mooney viscosity in the material kneading test of the same example and the conventional example.

FIG. 4 is a vertical sectional view showing an embodiment of the present invention according to claim 2;

FIG. 5 is a graph showing the relationship between specific energy and Mooney viscosity showing the results of the material kneading test of the same example of claim 2.

FIG. 6 is a graph showing the relationship between the material filling rate and the ram sheet time, showing the results of the material kneading test of the same example.

FIG. 7 is a vertical sectional view showing Conventional Example 1.

FIG. 8 is a vertical sectional view showing a second conventional example.

FIG. 9 is a vertical sectional view showing Conventional Example 3.

FIG. 10 is a plan view showing a rotor of Conventional Example 3.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed kneader 3 Chamber 4 Rotor 4A Body peripheral surface 5 Material supply port 7 Discharge port 10 Wing part 10A Working surface 11 Wing part outer peripheral end surface A Rotor axis distance C Opposing surface clearance d Wing surface and rotor shell Distance between facing surfaces with peripheral surface G Straight line connecting both rotor shafts O Rotor shaft center

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Sumio Hayashida 2-3-1, Niihama, Arai-cho, Takasago-shi, Hyogo Inside Takasago Works, Kobe Steel, Ltd. (72) Katsunobu Hagiwara 2-chome, Niihama, Arai-cho, Takasago-shi, Hyogo No. 3-1 Takasago Works, Kobe Steel, Ltd.

Claims (2)

[Claims] 1. A chamber having a material supply port at an upper part and a discharge port at a lower part, each port being closed so as to be hermetically sealed, and a chamber arranged in the chamber in parallel and rotatable with each other. In a hermetic kneader comprising a pair of bladed rotors, the blades of the rotors meshing with each other, the blades of the rotors have opposing action surfaces when meshing with each other. A closed-type kneading machine, characterized in that it is formed so as to maintain a constant gap on a straight line connecting the axis of the rotor. 2. A chamber having a material supply port in the upper part and a discharge port in the lower part, each port being closed so as to be hermetically sealed, and two chambers arranged in parallel and rotatable with each other in the chamber. A hermetically-sealed kneading machine comprising a pair of bladed rotors, wherein the blades of both rotors mesh with each other, and a rotor body peripheral surface facing the peripheral surface of the rotor blades. The distance between the facing surfaces on a straight line connecting the two rotor shaft centers is constant, and the ratio of the distance between the facing surfaces and the distance between the rotor shafts is set within the range of 0.01 to 0.04. A closed type kneading machine.