JP2007320184A - Kneader - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve, in a closed-type kneader equipped with a jacket-type cooling means, productivity and quality by enhancing the cooling efficiency and thus restraining the temperature rise of a material to be kneaded and preventing the burning of the green material and the like from being generated and also by enabling one-stage kneading. <P>SOLUTION: In the kneader comprising the outer wall of the kneading chamber in which a pair of rotors rotate, the cover body forming a closed space between it and the above outer wall and the cooling medium supplied to the closed space, the closed space forms a plurality of cooling chambers partitioned to the axial direction by a plurality of partition plates, the above partition plates are each provided with the communication hole whose circumferential position is different alternately, and the inflow hole and the outflow hole for the cooling medium are connected. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a kneader.
The present invention also relates to a closed kneader used for kneading materials to be kneaded such as rubber.

  As shown schematically in FIGS. 3 and 4, this type of closed kneader is arranged in a chamber 11, a kneading chamber 100 formed in the chamber 11, and the kneading chamber 100. A pair of rotors 500, a casing 12 extending to the upper part of the kneading chamber 100, a floating weight 13 disposed in the casing 12 so as to be movable up and down, and a material temperature detecting unit 14 located at the lower part of the kneading chamber 100. And.

The kneading chamber 100 has a shape in which two cylindrical spaces whose axis centers are parallel to each other are communicated with each other in a part of the circumferential direction.
In addition, the rotors 500 and 500 are rotated in different directions by motors (not shown) via rotary shafts 15 and 15 arranged concentrically with the cylindrical spaces.

  That is, in this closed kneader, a material to be kneaded such as a rubber material charged into the casing 12 from an upper charging port (not shown) is press-fitted into the kneading chamber 100 by the lowering of the floating weight 13, and the rotor in the kneading chamber 100 It is kneaded for a required time by rotation of 500,500 and discharged from the material discharge section.

By the way, in the process of kneading, the material to be kneaded generates heat due to continuous shearing. In particular, since the heat generation is remarkable in the rubber material kneading, the kneading becomes insufficient due to a decrease in viscosity, or if the vulcanization accelerator is added and kneading at once (one-stage kneading), the temperature of the rubber material to be kneaded is increased. A vulcanization reaction occurs, and subsequent molding with a mold becomes impossible.
Therefore, in order to suppress the temperature rise due to such shearing heat generation, the closed kneader is provided with a cooling means, and as this cooling means, a jacket type is adopted.

However, as shown in FIG. 3 and FIG. 4, the conventional jacket-type cooling means forms a cover body 400 that surrounds the outer wall 200 of the kneading chamber 100 in the chamber 11. A flow path meandering by a required number of partition plates 600, 600 is formed in the formed gap 300, and cooling is performed from an inlet 900 opened at one end of the flow path toward an outlet 1000 opened at the other end. The medium X is continuously flowed.
However, since the outer wall 200 between the kneading chamber 100 and the outer wall 200 has a considerable thickness in terms of strength calculation, the cooling rate is slow.

According to this conventional jacket system, when kneading is started, the temperature of the material to be kneaded rises due to shearing heat generation.
Therefore, since the temperature rise is remarkable, the material to be kneaded is first kneaded (Kneading A) without adding the vulcanization accelerator, and then the vulcanization accelerator is added to this material and kneaded (B kneading). 2 stage kneading is performed.

  In the two-stage kneading, after kneading A with a closed kneader, the material to be kneaded is once discharged and cooled for a predetermined time, and then kneaded again with a closed kneader. After kneading, there is a method in which B is kneaded continuously with a roll. In either case, however, many man-hours are required as compared with one-stage kneading.

  Moreover, since the upper limit of the material temperature which can add a vulcanization accelerator is 100-120 degreeC in many cases, in the conventional jacket-type cooling means, the cooling rate per minute is about 20 degreeC, for example. Even in the process of kneading A, for example, when the material temperature rises to 140 to 160 ° C., a waiting time of 1 to 3 minutes is required for cooling to a temperature at which the vulcanization accelerator can be added. In addition, since the material to be kneaded is in a large block shape, the internal temperature does not easily drop even when the waiting time elapses.

As a result, when B kneading is started, the material temperature rises in a short period of time, which may cause a dough burning phenomenon.
Therefore, in order to increase the cooling efficiency as much as possible, a mode in which a heat radiating plate is provided on the outer peripheral surface of the cover body has been proposed (JP 2001-170470 A).

However, even with this aspect, the cooling efficiency could not be sufficiently increased.
Further, the conventional one has a relatively thick outer wall, so that the heat efficiency is poor and the productivity is not improved.
For this reason, since the temperature of the cooling medium also needs to be relatively low, dew condensation occurs, which adversely affects the material to be kneaded.
JP 2001-170470 A Japanese Patent Publication No. 7-301

  The present invention has been made in view of the problems as described above, and the main technical problem thereof is to improve the cooling efficiency in a closed kneader equipped with a jacket-type cooling means, and to be kneaded. An object is to prevent the occurrence of baking of the dough by suppressing the temperature rise of the material and to enable one-stage kneading to improve productivity and quality.

  The kneading machine of the present invention comprises a kneading machine comprising an outer wall of a kneading chamber in which a pair of rotors rotate, a cover body forming a sealed gap between the outer walls, and a cooling medium supplied to the sealed gap. The sealing gap forms a plurality of cooling chambers partitioned in the axial direction by a plurality of partition plates, and the partition plates are provided with communication holes having different circumferential positions, respectively, The hole and the outflow hole are communicated with each other.

  According to the closed type kneader according to the present invention, the temperature rise due to shear heat generation during kneading can be suppressed lower than before, so that the waiting time for cooling the chamber to the temperature at which the next kneading can be started can be shortened. In particular, the improvement of the cooling efficiency enables one-stage kneading, and in this case, the number of steps is significantly reduced and the productivity is improved.

In addition, since the increase in temperature is suppressed, the decrease in the viscosity of the material to be kneaded with the increase in temperature is also suppressed, so that a greater shearing force is applied to improve the kneading efficiency, and as a result, the quality of the material can be improved. it can.
Moreover, since the thickness of the outer wall of the present invention is relatively thin, the thermal efficiency is good and the productivity is improved.
For this reason, since it is not necessary to make the temperature of a cooling medium so low compared with the past, there is no fear of condensation and it does not have a bad influence on the material to be kneaded.

  Further, according to the kneader of the invention of claim 1, in the two-stage kneading, when the vulcanizing agent system is introduced into the kneaded material after kneading with a roll and the kneading is performed, While there was a risk of variations in the introduction of the vulcanizing agent system, by allowing one-stage kneading, the vulcanizing agent system could be introduced in the closed kneader, It is possible to automate the charging and kneading work and reduce the variation in quality.

According to the kneading machine of the invention described in claim 2, the thickness of the outer wall can be reduced, and the cooling efficiency of the kneading chamber can be increased.
Furthermore, according to the kneading machine of the invention described in claim 3, since both the inflow hole and the outflow hole are provided below the kneading chamber, maintenance work is easy.

Furthermore, according to the kneading machine of the invention of claim 4, the cooling efficiency of the kneading chamber is good.
Furthermore, according to the kneader of the invention described in claim 5, the entire surface of the kneading chamber can be efficiently cooled.

Furthermore, according to the kneader of the invention described in claim 6, the work efficiency of kneading is good.
Furthermore, according to the kneader of the invention described in claim 7, the cooling medium can be easily handled.

Furthermore, according to the kneader of the invention of claim 8, the rubber compound can be kneaded efficiently.
Furthermore, according to the kneader of the invention described in claim 9, one-stage kneading is possible.

1 and 2 show a schematic structure of a closed kneader according to the present invention.
That is, the closed kneader includes an outer wall 2 of the kneading chamber 1 in which the pair of rotors 5 and 5 rotate, and a cover body 4 that forms a sealed gap 3 between the outer wall 2.
A cooling medium X such as water is supplied to the sealed gap 3.

A plurality of cooling chambers 7 defined in the axial direction by a plurality of partition plates 6 are formed in the sealed gap 3.
Further, in the vicinity of one end of the partition plate 6, communication holes 8 having different circumferential positions are provided.
The communication hole 8 is a through-hole that is round in the partition plate 6, and transitions to turbulent flow when the cooling medium X passes through the communication hole 8, thereby further improving the cooling efficiency.

Thus, the cooling medium X can flow from the inflow hole 9 to the outflow hole 10.
Further, since the entire inner and outer peripheral surfaces of the partition plate 6 are integrally fixed to the outer wall 2 and the cover body 4, the effect of reinforcing the outer wall 2 is high.
For this reason, the wall thickness of the outer wall 2 can be made thinner than before, and the cooling efficiency can be increased.

In addition, this effect can be further amplified by integrally fixing the end face of the partition plate 6 to the casing 12 side.
Further, since both the inflow hole 9 and the outflow hole 10 are provided below the kneading chamber 1, maintenance is easy.
In the present embodiment, the inflow hole 9 and the outflow hole 10 are provided on the lower side.

Furthermore, since the communication hole 8 is provided above the kneading chamber 1, the cooling efficiency is good.
Further, since the inflow hole 9 and the outflow hole 10 are positioned at one end and the other end in the axial direction, the entire surface of the kneading chamber 1 can be effectively cooled.

The pair of rotors 5 and 5 rotate in different directions.
The material to be kneaded that is usually kneaded in the kneading chamber 1 is a rubber compound to which a vulcanization accelerator is added, and this enables one-stage kneading.

  The present invention is not limited to the best mode for carrying out the invention described above, and various other configurations can be adopted without departing from the gist of the present invention.

Sectional drawing which shows schematic structure of the closed-type kneading machine which concerns on this invention, and was cut | disconnected by the plane orthogonal to the axial center of a rotor. The internal structure figure of the enclosed kneading machine partition plate which concerns on this invention. Sectional drawing which shows schematic structure of the conventional closed kneading machine, and was cut | disconnected by the plane orthogonal to the axial center of a rotor. FIG. 4 is an internal structure diagram of the conventional kneading machine partition plate shown in FIG. 3.

Explanation of symbols

1 Kneading chamber 2 Outer wall 3 Sealed space 4 Cover body 5 Rotor 6 Partition plate 7 Cooling chamber 8 Communication hole 9 Inlet hole 10 Outlet hole 11 ··· Chamber 12 ··· Casing 13 ··· Floating weight 15 · · · Rotating shaft

Claims (9)

  A cover body (4) forming a sealed gap (3) between the outer wall (2) of the kneading chamber (1) in which the pair of rotors (5) (5) rotates, and the outer wall (2); In the kneader comprising the cooling medium (X) supplied to the sealed gap (3), the plurality of cooling chambers (7) in which the sealed gap (3) is partitioned in the axial direction by a plurality of partition plates (6). ), And the partition plate (6) is provided with communication holes (8) having different circumferential positions alternately, and an inflow hole (9) and an outflow hole (10) for the cooling medium (X) are provided. A kneading machine characterized by being in communication.   The kneading machine according to claim 1, wherein the entire inner and outer peripheral surfaces of the partition plate (6) are integrally fixed to the outer wall (2) and the cover body (4).   The kneading machine according to claim 1 or 2, wherein both the inflow hole (9) and the outflow hole (10) are provided below or above the kneading chamber (1).   The kneading machine according to any one of claims 1 to 3, wherein the communication hole (8) is provided above the kneading chamber (1).   The kneading machine according to any one of claims 1 to 4, wherein the inflow hole (9) and the outflow hole (10) are located at one end and the other end in the axial direction.   The kneading machine according to any one of claims 1 to 5, wherein the pair of rotors (5) and (5) rotate in different directions.   The kneading machine according to any one of claims 1 to 6, wherein the cooling medium (X) is water.   The kneading machine according to any one of claims 1 to 7, wherein the material to be kneaded in the kneading chamber (1) is a rubber compound. The kneading machine according to claim 8, wherein a vulcanization accelerator is added to the rubber compound.

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