JP2007130953A - Sealed type kneader, and kneading method for rubber material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealed type kneader which can increase the cooling (or heating) efficiency by preventing a heat medium from taking a short path within a passage for the heat medium of a rotor blade, and at the same time, by raising the flowing velocity of the heat medium which circulates through the passage. <P>SOLUTION: The ratio R<SB>R</SB>/R<SB>C</SB>of the radius R<SB>R</SB>of a rotor shaft 31 and the internal surface radius R<SB>C</SB>of a chamber 1 is 0.65 or higher (in the case of the operation, the ratio is approximately 0.7). The ratio H<SB>W</SB>/R<SB>C</SB>of the height H<SB>W</SB>in the diametrical direction of the rotor blade 32 and the internal surface radius R<SB>C</SB>of the chamber 1 is 0.35 or lower (in the case of the operation, the ratio is approximately 0.3). The passage 42 for the heat medium of the rotor blade 32 is constituted of one piece of the passage which has an approximately similar shape as the outer shape of the rotor blade 32. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a hermetic kneader for kneading high viscosity materials such as rubber and plastic and a kneading method for rubber material, and in particular, hermetically forming a heat medium flow path on a rotor shaft and rotor blades of a rotor. The present invention relates to a kneading machine and a rubber material kneading method.
Here, the “heat medium” includes a heating medium in addition to a cooling medium, and the medium also includes a gas such as a vapor in addition to a liquid.

Conventionally, as a closed kneading machine for kneading high-viscosity materials such as rubber and plastic, as shown in FIG. 6, a chamber 1 for storing the kneaded material and a pressure lid for closing the upper portion of the chamber 1 2 and a pair of rotors 3 having rotor blades 32 rotatably mounted in the chamber 1, cooling medium flow paths 41 and 42 are formed in the rotor shaft 31 and the rotor blades 32 of the rotor 3, respectively. A closed kneader has been put into practical use (for example, see Patent Document 1).
In this hermetic kneader, the coolant shafts 41 and 42 are formed in the rotor shaft 31 and the rotor blades 32 of the rotor 3, respectively, so that the surface of the rotor shaft 31 of the rotor 3 is efficiently cooled and the kneaded material The temperature rise was kept low, the material did not stick to the rotor 3 after the kneading was completed, and the kneaded material could be easily taken out.
However, this internal mixer, the rotor shaft radius _{R R} and the chamber inner surface radius _{R C} of the ratio _R R / _{R C} and the height in the radial direction of the rotor blade 32 _{H W} and the chamber inner surface radius _{R C} of the ratio _H W / R _C are both about 0.5, the ratio _a W / a of the cross-sectional area _{a R} of the rotor shaft 31 the rotor blade 32 as compared becomes large (the one rotor blade of the cross-sectional area _{a W} and the rotor shaft _R is also about 0.5 to 0.7) for (where the chamber inner surface radius _{R C,} the rotor shaft radius _{R R,} the radial height _{H W} of the rotor blades 32, the cross-sectional area _{a R} of the rotor shaft the meaning of the cross-sectional area a _W of the rotor blade, see FIGS. 1 and 2), the cross-sectional area of the cooling medium flow passage 42 of the rotor blade 32 also increases in accordance with this, the cooling medium in the flow channel 42 The short path causes non-uniformity in the cooling effect, and the flow path 42 By reducing the flow rate of the circulating cooling medium, the cooling effect by the rotor blade 32 is difficult to obtain in the vicinity of the outer surface of the rotor blade 32 where heat generation is most likely to occur when the material is kneaded, so the kneading efficiency does not increase, In the case of a highly viscous material or a material that easily generates heat, there is a problem that kneading cannot be performed sufficiently or the kneaded material cannot be easily taken out due to the material sticking to the rotor 3 after the kneading is completed. there were.

On the other hand, as shown in FIG. 7, in the kneading rotor having the rotary shafts 51 and 71 and the rotor main bodies 52 and 72 provided on the outer periphery of the rotary shafts 51 and 71, the rotor main bodies 52 and 72 are formed on the outer surface. The inner members 53 and 73 in which the wing portions 55 and 75 are formed and the grooves 56 and 76 are formed at least in the formation portion of the wing portions 55 and 75 on the outer surface, and the outer surfaces of the inner members 53 and 73 are copied. The outer members 54 and 74 covering the outer surface are provided, and a passage space through which the cooling medium flows is formed by the grooves 56 and 76 and the outer members 54 and 74, thereby preventing the cooling medium from short-passing, There has been proposed one that can improve the cooling efficiency and reduce the time required for kneading (see, for example, Patent Document 2).
However, since this kneading rotor requires two members, the inner members 53 and 73 and the outer members 54 and 74, there is a problem that the structure becomes complicated and the manufacturing cost of the apparatus increases.
Japanese Patent Publication No. 7-301 JP 2005-144716 A

  In view of the problems of the above conventional closed kneader, the present invention prevents the heat medium from short-circuiting in the flow path of the heat medium of the rotor blade and increases the flow rate of the heat medium flowing through the flow path. An object of the present invention is to provide a closed kneader capable of improving cooling (or heating) efficiency.

In order to achieve the above object, a closed kneader according to the present invention includes a chamber for storing a kneaded material, a pressure lid for closing the upper portion of the chamber, and a pair of rotors having rotor blades attached in the chamber. And a ratio R _R / _RC of the rotor shaft radius R _R and the chamber inner surface radius R _C is 0.65 or more in a closed kneader in which a heat medium flow path is formed on the rotor shaft and rotor blades of the rotor, The ratio H _W / _RC of the radial height H _W of the rotor blade to the chamber inner surface radius _RC is 0.35 or less, and the flow path of the heat medium of the rotor blade is substantially similar to the outer shape of the rotor blade It is characterized by comprising one flow path forming the following.

In this case, the ratio _A W / _{A R} of the cross-sectional area _{A R} of the cross-sectional area of the rotor blade _{A W} and the rotor shaft is 0.02-0.12, the cross-sectional area of the flow path of the heat medium formed in the rotor blade _{A F2} The ratio A _F2 / A _{W of the} rotor blade cross-sectional area A _W can be set to 0.1 to 0.5.

  Also, the heat medium flow paths formed on the rotor blades are connected in series so that all the heat medium introduced into the rotor shaft flows through the heat medium flow paths formed on the rotor blades connected in series. Can be.

  Moreover, the flow path of the heat medium formed on the rotor shaft can be divided into a plurality in the circumferential direction, and the flow paths can be connected in series.

The ratio A _F2 / A _F1 between the cross-sectional area A _F2 of the flow path of the heat medium formed on the rotor blade and the cross-sectional area A _F1 of one flow path of the heat medium formed on the rotor shaft is 0.2-2. It can be set to zero.

  Furthermore, rubber and filler can be kneaded using the above-mentioned closed kneader.

According to the closed kneading machine of the present invention, the rotor includes a chamber for storing the kneaded material, a pressure lid for closing the upper portion of the chamber, and a pair of rotors having rotor blades attached in the chamber. In a hermetic kneader in which a heat medium flow path is formed on the rotor shaft and rotor blades, the ratio R _R / _RC of the rotor shaft radius R _R and the chamber inner surface radius R _C is 0.65 or more, and the radial direction of the rotor blades the ratio H _{W /} R _C of the height H _W and the chamber inner surface radius R _C is 0.35 or less, one of the flow paths of the heat medium of the rotor blades forming the outer shape substantially similar shape of the rotor blade Since the cross-sectional area of the rotor blade is smaller than that of the rotor shaft, the cross-sectional area of the flow path of the heat medium of the rotor blade is increased without increasing the thickness of the rotor blade. The heat can be reduced in the heat medium flow path of the rotor blade. While preventing the medium from short-circuiting, the flow velocity of the heat medium flowing through the flow path can be increased. As a result, the cooling (or heating) efficiency can be improved, and in particular, the cooling effect by the rotor blades can be easily obtained in the vicinity of the outer surface of the rotor blades where heat generation is most likely to occur when the materials are kneaded. Even in the case of a highly viscous material or a material that is likely to generate heat, the efficiency can be improved and kneading can be sufficiently performed. Can be taken out reliably.

The ratio _A W / _{A R} of the cross-sectional area _{A R} of the cross-sectional area _{A W} and the rotor shaft of the rotor blades is 0.02-0.12, the cross-sectional area _{A F2} of the flow path of the heat medium formed in the rotor blade rotor By making the ratio A _F2 / A _W to the blade cross-sectional area A _W be 0.1 to 0.5, the flow rate of the heat medium flowing through the flow path of the heat medium of the rotor blade is further increased. It is possible to prevent nonuniformity in the flow rate of the heat medium in the flow path.

  Also, the heat medium flow paths formed on the rotor blades are connected in series so that all the heat medium introduced into the rotor shaft flows through the heat medium flow paths formed on the rotor blades connected in series. By doing so, the flow velocity of the heat medium flowing through the flow path of the heat medium of the rotor blades can be further increased.

  In addition, the flow path of the heat medium formed on the rotor shaft is divided into a plurality of circumferential directions, and the flow paths are connected in series so that the flow rate of the heat medium does not become uneven in the flow path. The material can be cooled (or heated) more uniformly.

The ratio A _F2 / A _F1 between the cross-sectional area A _F2 of the flow path of the heat medium formed on the rotor blade and the cross-sectional area A _F1 of one flow path of the heat medium formed on the rotor shaft is 0.2-2. By controlling the flow rate of the heat medium flowing through the flow path of the heat medium formed on the rotor shaft and the flow path of the heat medium formed on the rotor blade, the material is cooled (or heated). The state can be controlled easily and with high accuracy.

  Furthermore, by using the above-mentioned closed kneader and kneading the rubber and filler, it is possible to sufficiently knead the rubber and filler that are highly viscous and easily generate heat, thereby improving dispersibility. Quality rubber material can be obtained.

  Hereinafter, embodiments of the closed kneader of the present invention will be described with reference to the drawings.

1 to 3 show an embodiment of a closed kneader of the present invention.
This closed kneading machine is for kneading high viscosity materials such as rubber and plastic. As shown in FIG. 1, a chamber 1 for storing the kneaded material and an additive for closing the upper portion of the chamber 1 are used. A pressure lid 2 and a pair of rotors 3 having rotor blades 32 rotatably mounted in the chamber 1 are provided, and heat medium channels 41 and 42 are respectively provided on the rotor shaft 31 and the rotor blades 32 of the rotor 3. Try to form.
Here, the “heat medium” includes a heating medium in addition to a cooling medium, and the medium state includes a gas such as a vapor in addition to a liquid. In this embodiment, a case where a cooling medium is used will be described. .

Then, in this internal mixer, the radius _{R R} and the ratio _R R / _{R C} of the inner surface radius _{R C} of the chamber 1 is 0.65 or more rotor shaft 31 (in this embodiment, about 0.7), (in this example, about 0.3) the ratio _H W / _{R C} is 0.35 or less of the inner surface radius _{R C} of the radial height _{H W} and the chamber 1 of the rotor blade 32 a, a rotor blade 32 The heat medium flow path 42 is partitioned by the outer peripheral surface of the rotor shaft 31 and the rotor blades 32, and has a substantially similar shape to the outer shape of the rotor blades 32. Specifically, in this embodiment, the cross section is substantially triangular. A single flow path is formed.

  In this hermetic kneader, the cross-sectional area of the rotor blade 32 is smaller than that of the rotor shaft 31, so that the cross-sectional area of the flow path 42 of the heat medium of the rotor blade 32 is increased without increasing the thickness of the rotor blade 32. The heat medium can be prevented from short-passing in the heat medium flow path 42 of the rotor blade 32, and the flow speed of the heat medium flowing through the flow path 42 can be increased.

In this case, as shown in FIG. 2, the ratio _A W / _{A R} of the cross-sectional area _{A R} of the cross-sectional area _{A W} and the rotor shaft 31 of the rotor blade 32 is 0.02 to 0.12, preferably, 0.04 .About.0.10 (about 0.06 in the present embodiment), the ratio A _F2 / A of the cross-sectional area A _F2 of the flow path 42 of the heat medium formed on the rotor blade 32 and the cross-sectional area A _W of the rotor blade 32 _It is preferable that _W is 0.1 to 0.5, preferably 0.2 to 0.4 (about 0.2 in this embodiment).
As a result, the flow rate of the heat medium flowing through the flow path 42 of the heat medium of the rotor blades 32 can be further increased, and the flow rate of the heat medium can be prevented from becoming uneven in the flow path 42.

  By the way, in the present embodiment, as shown in FIGS. 1A and 1C 1, the heat medium flow path 42 of the rotor blade 32 is partitioned by the outer peripheral surface of the rotor shaft 31 and the rotor blade 32. However, the method for forming the flow path 42 of the heat medium is not limited to this. For example, as shown in FIG. 1 (c2), a space defined by the rotor blades 32 alone is a flow path of the heat medium. 42, or as shown in FIG. 1 (c3), a space defined by the rotor blades 32 and the closing plate 32a can be used as the flow path 42 of the heat medium.

Further, in this embodiment, as shown in FIG. 3 (however, FIG. 3 schematically shows each flow path, and actually, the flow path 41 of the heat medium formed on the rotor shaft 31 is: 1, a heat medium passage 41 is formed in the vicinity of the shaft surface of the rotor shaft 31.) When one rotor 3 is viewed, the rotor shaft 31 is provided. The flow path 42 of the heat medium formed on the two rotor blades 32 is connected in series via the flow path 41 of the heat medium formed on the rotor shaft 31 and introduced into the rotor shaft 31 of one rotor 3. The flow rate of the heat medium of the rotor blades 32 is ensured by flowing all the heat medium sequentially through the flow path 42 of the heat medium formed in the rotor blades 32 connected in series. It is possible to further increase the flow rate of the heating medium.
The number of rotor blades 32 provided on the rotor shaft 31 is not limited to two in the present embodiment, and may be one or three or more.

By the way, the flow path 41 of the heat medium formed in the rotor shaft 31 can be constituted by one flow path as shown in FIG. 1, but the flow path 41 of the heat medium is divided into a plurality in the circumferential direction. It is also possible to connect the flow paths 41 formed in a divided manner in series.
As a result, the flow rate of the heat medium in the heat medium channel 41 can be prevented from becoming uneven, and the material can be cooled more uniformly.

Furthermore, the ratio A _F2 / A of the cross-sectional area A _F2 of the flow path 42 of the heat medium formed on the rotor blade 32 and the cross-sectional area A _F1 of one flow path 41 of the heat medium formed by dividing the rotor shaft 31 A _F1 may be 0.2 to 2.0, preferably 0.3 to 1.2, and more preferably 0.4 to 0.8.
Thereby, by controlling the flow rate of the heat medium flowing through the heat medium flow path 41 formed in the rotor shaft 31 and the heat medium flow path 41 formed in the rotor blade 32, the cooling state of the material can be easily and highly accurately controlled. Can be controlled.

4, the closed kneader (WD55) of the embodiment of the present invention described in FIGS. 1 to 3 and the closed kneader (D75) described in FIG. 5 (the closed kneader illustrated in FIG. 6 and Similarly, the ratio _H W / _{R C} of the rotor shaft radius _{R R} and the chamber inner surface radius _{R C} of the ratio _R R / _{R C} and radial height _{H W} and the chamber inner surface radius _{R C} of the rotor blades 32 are both 0.5 extent, one internal mixer ratio _a W / _{a R} of the cross-sectional area _{a R} of the cross-sectional area _{a W} and the rotor shaft of the rotor blades is set to about 0.5 to 0.7) and using a rubber ( The result of kneading SBR (styrene butadiene rubber)) and carbon black as a reinforcing filler is shown.
As is clear from the graph showing the relationship between the accumulated rotational speed of the rotor and the volume resistivity, the closed kneader (WD55) of the embodiment of the present invention has the same accumulated value as compared with the closed kneader (D75). The volume resistivity in the case of the rotational speed is large, and by using the closed kneader (WD55) of the embodiment of the present invention, it is possible to sufficiently knead the rubber and filler that are likely to generate heat with high viscosity, As a result, it was confirmed that a high-quality rubber material with improved dispersibility can be obtained.
Here, examples of fillers kneaded with rubber include fillers such as silica in addition to carbon black.

As described above, the closed-type kneader of the present invention has been described based on the examples thereof, but the present invention is not limited to the structures described in the above-described examples, and the structure is appropriately set within the scope not departing from the gist thereof. It can be changed.
In the above-described embodiments, the case where a cooling medium is used as the “heating medium” has been described. However, a heating medium can be used as the “heating medium”. In addition to the liquid, the medium can be a gas such as a vapor.

  The hermetic kneading machine of the present invention increases the flow rate of the heat medium flowing through the flow path of the heat medium of the rotor blade, and prevents the heat flow rate of the heat medium from becoming uneven in the flow path. (Or heating) The efficiency can be improved, so it can be suitably used for kneading materials with high viscosity and easily generating heat, and also for kneading materials such as rubber and plastic while cooling or heating. Can be widely used.

1 shows an embodiment of a closed kneader of the present invention, (a) is a front sectional view, (b) is an explanatory view of a rotor, and (c1) to (c3) are flow paths of a heat medium formed on a rotor blade. It is explanatory drawing which shows an example. It is explanatory drawing which shows the cross-sectional area of the rotor shaft, the cross-sectional area of a rotor blade | wing, and the cross-sectional area of the flow path of the heat medium formed in the rotor blade | wing. It is explanatory drawing which shows the distribution route of the heat medium of the rotor. It is a graph which shows the relationship between the rotation speed of a rotor, and volume resistivity. The closed kneading machine of a comparative example is shown, (a) is front sectional drawing, (b) is explanatory drawing of a rotor. It is explanatory drawing of the conventional closed kneading machine. It is explanatory drawing of the rotor for conventional kneading | mixing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Chamber 2 Pressure lid 3 Rotor 31 Rotor shaft 32 Rotor blade 41 Heat medium flow path 42 Heat medium flow path

Claims (6)

A chamber for storing the kneaded material; a pressure lid for closing the upper portion of the chamber; and a pair of rotors having rotor blades attached in the chamber; and a flow of a heat medium on the rotor shaft and the rotor blades of the rotor. In a closed kneader having a path, the ratio of the rotor shaft radius (R _R ) to the chamber inner surface radius (R _C ) (R _R / R _C ) is 0.65 or more, and the radial height of the rotor blade (H _{W 1} ) and a chamber inner surface radius (R _C ) ratio (H _W / R _C ) of 0.35 or less, and the flow path of the heat medium of the rotor blade is substantially similar to the outer shape of the rotor blade A closed kneader characterized by comprising a flow path of The ratio (A _W / A _R ) of the cross-sectional area (A _W ) of the rotor blades to the cross-sectional area (A _R ) of the rotor shaft is 0.02 to 0.12, and the cross-sectional area of the flow path of the heat medium formed on the rotor blades The closed kneading machine according to claim 1, wherein a ratio (A _F2 / A _W ) between (A _F2 ) and the cross-sectional area (A _W ) of the rotor blade is 0.1 to 0.5.   The flow path of the heat medium formed on the rotor shaft and the flow path of the heat medium formed on the rotor blade are connected in series, and all the heat medium introduced to the rotor shaft is formed on the rotor blade connected in series. The hermetic kneading machine according to claim 1 or 2, characterized in that it circulates through the flow path of the heat medium.   The hermetic kneader according to claim 1, 2, or 3, wherein the flow path of the heat medium formed on the rotor shaft is divided into a plurality of circumferential directions and the flow paths are connected in series. The ratio (A _F2 / A _F1 ) of the cross-sectional area (A _F2 ) of the flow path of the heat medium formed on the rotor blade to the cross-sectional area (A _F1 ) of one flow path of the heat medium formed on the rotor shaft is 0. The hermetic kneader according to claim 1, 2, 3 or 4, which is 2 to 2.0.   A rubber material kneading method, wherein the rubber and filler are kneaded using the closed kneader according to claim 1, 2, 3, 4 or 5.

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