JP3553260B2 - Closed kneader - Google Patents

Closed kneader Download PDF

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Publication number
JP3553260B2
JP3553260B2 JP02526996A JP2526996A JP3553260B2 JP 3553260 B2 JP3553260 B2 JP 3553260B2 JP 02526996 A JP02526996 A JP 02526996A JP 2526996 A JP2526996 A JP 2526996A JP 3553260 B2 JP3553260 B2 JP 3553260B2
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Japan
Prior art keywords
rotor
short
long
kneaded
wing
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Expired - Lifetime
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JP02526996A
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Japanese (ja)
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JPH09216224A (en
Inventor
高司 森部
彌十郎 清家
敏和 庄島
修一 花田
洋文 今村
俊介 丸山
雅博 黒沢
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Mitsubishi Heavy Industries Ltd
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Mitsubishi Heavy Industries Ltd
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Priority to JP02526996A priority Critical patent/JP3553260B2/en
Publication of JPH09216224A publication Critical patent/JPH09216224A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
    • B29B7/06—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices
    • B29B7/10—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary
    • B29B7/18—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary with more than one shaft
    • B29B7/183—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary with more than one shaft having a casing closely surrounding the rotors, e.g. of Banbury type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
    • B29B7/06—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices
    • B29B7/10—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary
    • B29B7/18—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary with more than one shaft
    • B29B7/183—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary with more than one shaft having a casing closely surrounding the rotors, e.g. of Banbury type
    • B29B7/186—Rotors therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
    • B29B7/22—Component parts, details or accessories; Auxiliary operations
    • B29B7/26—Component parts, details or accessories; Auxiliary operations for discharging, e.g. doors
    • B29B7/263—Component parts, details or accessories; Auxiliary operations for discharging, e.g. doors from the underside in mixers having more than one rotor and a a casing closely surrounding the rotors
    • B29B7/266—Component parts, details or accessories; Auxiliary operations for discharging, e.g. doors from the underside in mixers having more than one rotor and a a casing closely surrounding the rotors using sliding doors

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、ゴム、プラスチック等の混練に使用する密閉式混練機に関するものである。
【０００２】
【従来の技術】
従来の密閉式混練機を図５及び図６により説明すると、６が密閉されたミキシングチャンバー、１が同ミキシングチャンバー６の内部に平行に配設された２つのロータ、２が同各ローラ１に設けた２つの長翼、３が回転方向上流側の長翼２の後方及び回転方向下流側の長翼２の後方に各ロータ１の一端部側及び他端部側を始点として設けた短翼、４が各ロータ１の回転方向、７がフローティングウェイト、８がドロップドアで、各ロータ１を逆方向に回転させる一方、ホッパー（図示せず）から投入した被混練物をフローティングウェイト７を下降させることにより、ミキシングチャンバー６内へ圧入させて混練する。
【０００３】
そして混練を終了したら、ミキシングチャンバー６下部のドロップドア８を開いて、ミキシングチャンバー６外へ排出する。
【０００４】
【発明が解決しようとする課題】
密閉式混練機に求められる性能は、混練品質及び生産性の向上である。これらの要求性能を向上させるためには、被混練物に対する剪断性や流動性が重要であり、特にゴムの混練においては、配合剤であるカーボンブラックやオイル等との十分な混練が必要である。
【０００５】
しかし最近のゴムの高品質化に伴い、配合剤としてのオイル投入量が増加することにより、オイルが潤滑剤になって、チャンバー壁との間でゴムの滑りが生じることがある。
この場合、配合剤が十分に混練されなくて、品質が低下するとともに、スリップにより混練時間が長くなって、生産性が低下するという問題があった。
【０００６】
本発明は前記の問題点に鑑み提案するものであり、その目的とする処は、混練品質、生産性を向上できる密閉式混練機を提供しようとする点にある。
【０００７】
【課題を解決するための手段】
上記の目的を達成するために、本発明は、密閉されたミキシングチャンバーの内部に平行に配設されて互いが逆方向に回転する２つのロータを有し、各ロータのそれぞれに２つの長翼を設けた密閉式混練機において、前記各長翼のうち、回転方向上流側の長翼の後方にロータの両端部側を始点とする短翼を設け、回転方向下流側の長翼の後方にロータの両端部側を始点とする短翼を設けている（請求項１）。またこの密閉式混練機において、各長翼の両端部を切り欠いて、そこに被混練物の流路を形成してもよい（請求項２）。またこの密閉混練機において、各ロータの回転により被混練物をロータの両端部側からロータの内側に向かって流動させるように各短翼をロータ上に配設してもよい（請求項３）。
【０００８】
【発明の実施の形態】
次に本発明の密閉式混練機を図１及び図２に示す実施形態により説明する。
図１は、同密閉式混練機のロータの第１実施形態を示す展開図、図２は、同ロータの第２実施形態を示す展開図である。
図１の６が密閉されたミキシングチャンバー、１が同ミキシングチャンバー６の内部に平行に配設された２つのロータ、２が各ロータ１に設けた２つの長翼、４が各ロータ１の回転方向である。また３Ａ、３Ｂが回転方向上流側の長翼２の後方のロータ１上にロータ１の一端部側及び他端部側を始点として設けた短翼、３Ｃ、３Ｄが回転方向下流側の長翼２の後方に各ロータ１の一端部側及び他端部側を始点として設けた短翼である。
【０００９】
なお短翼３Ａ、３Ｄは、従来の短翼３の設置位置付近に設けられるが、翼数の増大に伴い、翼長さ、形状等は最適形状に調整される。また翼数の増加により、チャンバー６内空間が減少するので、投入バッチ量の低下が問題になるような場合には、図２に示すように長翼２の両端部を切り欠いて、そこに被混練物の流路を形成してもよい（請求項２参照）。
【００１０】
次に前記図１及び図２に示す密閉式混練機の作用を具体的に説明する。
各長翼２のうち、回転方向上流側の長翼２の後方にロータ１の両端部側を始点とする短翼３Ａ、３Ｂを設け、回転方向下流側の長翼２の後方にロータ１の両端部側を始点とする短翼３Ｃ、３Ｄを設けており、長翼２によりロータ１の端部の方向へ分岐した被混練物が、これらの短翼３Ａ、３Ｂ及び３Ｃ、３Ｄにより、ロータ１の内側に向かい流動して、ミキシングチャンバー内部での混練作用が向上する。
【００１１】
このとき、被混練物は、ロータ１が１回転する間に、長翼２及び短翼３Ａ〜３Ｄにより、強力な剪断作用を周方向で少なくとも２回以上受けることになり、被混練物が短時間で分散して、混練品質、生産性が向上する。５は被混練物の流れ方向を示している。
本発明の密閉混練機の作用を確認するため、チャンバー径φ１２８のラボミキサーを用いて、ゴム混練試験を実施した。
【００１２】
図３は、ゴムが一定品質（ここではムーニ粘度を用いて評価した）になるのに必要な混練時間を示している。図３により、本発明の密閉式混練機のロータは、従来のものに比較して混練品質が短時間で向上することが明らかであり、生産性も向上することが明らかである。
またゴムにカーボンブラックやオイル等を添加して混練する場合、通常は、図４に示すような電力の経時変化を示す。添加剤としてオイルを投入した場合、オイルが潤滑油となって、チャンバー壁との間でゴムの滑りを生じるが、このとき、電力は一旦低下した後、再び上昇するので、混練時間が長くなる等の問題が発生する。このようなオイル添加時のゴム混練試験を行った結果、本発明の密閉式混練機では、スリップ時間が従来の約５０％に短縮されることが確認された。
【００１３】
【発明の効果】
本発明の密閉式混練機は前記のように各長翼のうち、回転方向上流側の長翼の後方にロータの端部側を始点とする短翼を設け、回転方向下流側の長翼の後方にロータの端部側を始点とする短翼を設けており、各長翼によりロータの両端部の方向へ分岐した被混練物をこれらの短翼によりロータの内側に向かい流動させるので、ミキシングチャンバー内部での被混練物の混練作用が向上する。このとき、被混練物は、ロータが１回転する間に、長翼及び短翼により強力な剪断作用を周方向で少なくとも２回以上受けることになり、被混練物を短時間で分散できる上に、オイル投入時のスリップ時間も短縮できて、混練品質、生産性を向上できる。
【図面の簡単な説明】
【図１】本発明の密閉式混練機のロータの第１実施形態を示す展開図である。
【図２】同ロータの第２実施形態を示す展開図である。
【図３】混練品質（ムーニ粘度）と混練時間との関係を示す説明図である。
【図４】電力−時間チャート図である。
【図５】従来の密閉混練機の縦断側面図である。
【図６】同密閉式混練機のロータの展開図である。
【符号の説明】
１ ロータ
２ 長翼
３Ａ、３Ｂ 回転方向上流側の長翼２の後方に設けた短翼
３Ｃ、３Ｄ 回転方向下流側の長翼２の後方に設けた短翼
４ 回転方向
５ 被混練物の流れ方向
６ ミキシングチャンバー
７ フローティングウェイト
８ ドロップドア[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to an internal mixer used for kneading rubber, plastic, and the like.
[0002]
[Prior art]
5 and 6, a conventional closed kneader will be described. Referring to FIG. 5, reference numeral 6 denotes a closed mixing chamber, 1 denotes two rotors arranged in parallel in the mixing chamber 6, and 2 Short wings provided with the two long wings 3 provided behind the long wing 2 on the upstream side in the rotational direction and behind the long wing 2 on the downstream side in the rotational direction with the one end side and the other end side of each rotor 1 as starting points. Reference numeral 4 denotes a rotation direction of each rotor 1, 7 denotes a floating weight, and 8 denotes a drop door. Each of the rotors 1 is rotated in the opposite direction, and the material to be kneaded from a hopper (not shown) is lowered by the floating weight 7. By doing so, it is pressed into the mixing chamber 6 and kneaded.
[0003]
When the kneading is completed, the drop door 8 at the lower part of the mixing chamber 6 is opened, and the mixture is discharged out of the mixing chamber 6.
[0004]
[Problems to be solved by the invention]
The performance required of the closed kneader is to improve kneading quality and productivity. In order to improve these required performances, shearability and fluidity with respect to the material to be kneaded are important, and in the kneading of rubber in particular, sufficient kneading with a compounding agent such as carbon black or oil is necessary. .
[0005]
However, with the recent improvement in quality of rubber, an increase in the amount of oil added as a compounding agent causes the oil to become a lubricant, which may cause slippage of the rubber with the chamber wall.
In this case, there is a problem that the compounding agent is not sufficiently kneaded, the quality is reduced, and the kneading time is prolonged due to slip, and the productivity is reduced.
[0006]
The present invention has been made in view of the above problems, and has as its object to provide a closed kneader capable of improving kneading quality and productivity.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention comprises two rotors arranged in parallel in a closed mixing chamber and rotating in opposite directions, each having two long blades. In the closed kneader provided with, among the long wings, short wings starting at both ends of the rotor are provided behind the long wing on the upstream side in the rotation direction, and behind the long wing on the downstream side in the rotation direction. Short wings are provided starting from both ends of the rotor (claim 1). Further, in this closed kneader, both ends of each long blade may be cut out to form a flow path for the material to be kneaded therein (claim 2). Further, in this closed kneader, each short blade may be arranged on the rotor so that the material to be kneaded flows from both ends of the rotor toward the inside of the rotor by the rotation of each rotor. .
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, the internal mixer according to the present invention will be described with reference to the embodiment shown in FIGS.
FIG. 1 is a development view showing a first embodiment of the rotor of the internal mixer, and FIG. 2 is a development view showing a second embodiment of the rotor.
In FIG. 1, 6 is a closed mixing chamber, 1 is two rotors arranged in parallel inside the mixing chamber 6, 2 is two long blades provided on each rotor 1, and 4 is the rotation of each rotor 1. Direction. Short wings 3A and 3B are provided on the rotor 1 behind the long wing 2 on the upstream side in the rotation direction with one end side and the other end side of the rotor 1 as starting points, and 3C and 3D are long wings on the downstream side in the rotation direction. 2 are short blades provided starting from one end and the other end of each rotor 1.
[0009]
The short wings 3A and 3D are provided near the installation position of the conventional short wing 3, but as the number of wings increases, the wing length, shape, and the like are adjusted to optimal shapes. In addition, since the space in the chamber 6 is reduced due to the increase in the number of blades, if the decrease in the amount of the batch to be charged becomes a problem, the both ends of the long blade 2 are cut off as shown in FIG. A channel for the material to be kneaded may be formed (see claim 2).
[0010]
Next, the operation of the internal mixer shown in FIGS. 1 and 2 will be specifically described.
Of each long wing 2, short wings 3 </ b> A and 3 </ b> B starting from both ends of the rotor 1 are provided behind the long wing 2 on the upstream side in the rotation direction, and the rotor 1 is provided behind the long wing 2 on the downstream side in the rotation direction. Short blades 3C and 3D starting from both ends are provided, and the material to be kneaded branched by the long blade 2 toward the end of the rotor 1 is rotated by the short blades 3A, 3B and 3C and 3D. 1, and the kneading action inside the mixing chamber is improved.
[0011]
At this time, the material to be kneaded receives a strong shearing action at least twice in the circumferential direction by the long blades 2 and the short blades 3A to 3D during one rotation of the rotor 1, and the material to be kneaded is short. Dispersing over time improves kneading quality and productivity. 5 indicates the flow direction of the material to be kneaded.
In order to confirm the operation of the closed kneader of the present invention, a rubber kneading test was performed using a laboratory mixer having a chamber diameter of φ128.
[0012]
FIG. 3 shows the kneading time required for the rubber to reach a constant quality (evaluated here using Mooney viscosity). FIG. 3 clearly shows that the kneading quality of the rotor of the hermetic kneader of the present invention is improved in a shorter time than that of the conventional rotor, and that the productivity is also improved.
In addition, when carbon black, oil, or the like is added to rubber and kneaded, the power usually shows a temporal change as shown in FIG. When oil is added as an additive, the oil becomes a lubricating oil, causing rubber to slide between the chamber walls. At this time, since the power once decreases and then increases again, the kneading time becomes longer. And other problems occur. As a result of a rubber kneading test performed when such an oil was added, it was confirmed that the slip time was reduced to about 50% of the conventional kneader of the present invention.
[0013]
【The invention's effect】
The closed kneader of the present invention, as described above, among the long blades, the short blades starting from the end side of the rotor are provided behind the long blades on the upstream side in the rotation direction, and the long blades on the downstream side in the rotation direction are provided. A short wing is provided at the rear end starting from the end of the rotor, and the material to be kneaded branched toward both ends of the rotor by the long wings is caused to flow toward the inside of the rotor by these short wings. The kneading action of the material to be kneaded inside the chamber is improved. At this time, the material to be kneaded is subjected to strong shearing action by the long blades and short blades at least twice in the circumferential direction during one rotation of the rotor, and the material to be kneaded can be dispersed in a short time. Also, the slip time at the time of oil supply can be shortened, and the kneading quality and productivity can be improved.
[Brief description of the drawings]
FIG. 1 is a development view showing a first embodiment of a rotor of an internal mixer of the present invention.
FIG. 2 is a development view showing a second embodiment of the rotor.
FIG. 3 is an explanatory diagram showing a relationship between kneading quality (Mouni viscosity) and kneading time.
FIG. 4 is a power-time chart.
FIG. 5 is a vertical sectional side view of a conventional closed kneader.
FIG. 6 is a development view of a rotor of the internal mixer.
[Explanation of symbols]
Reference Signs List 1 rotor 2 long blades 3A, 3B short blades 3C, 3D provided behind long blade 2 on the upstream side in the rotation direction short blades 4 provided behind long blade 2 on the downstream side in the rotation direction 4 rotation direction 5 flow of material to be kneaded Direction 6 Mixing chamber 7 Floating weight 8 Drop door

Claims (3)

密閉されたミキシングチャンバーの内部に平行に配設されて互いが逆方向に回転する２つのロータを有し、各ロータのそれぞれに２つの長翼を設けた密閉式混練機において、
前記各ロータには、回転方向順に、長翼、２つの短翼、長翼、２つの短翼が各々配設されているとともに、前記各々の２つの短翼のうち一方の短翼は、前記ロータの一端部を始点として設けられているとともに、他方の短翼は前記ロータの他端部を始点として設けられていることを特徴とする密閉式混練機。In a closed kneader having two rotors arranged in parallel in a sealed mixing chamber and rotating in opposite directions to each other, and each rotor is provided with two long blades,
In each of the rotors, a long wing, two short wings, a long wing, and two short wings are respectively disposed in the order of rotation, and one of the two short wings is the short wing, A closed kneader, wherein one end of the rotor is provided as a starting point, and the other short blade is provided starting from the other end of the rotor. 前記各長翼の両端部を切り欠いて、そこに被混練物の流路を形成した請求項１記載の密閉式混練機。 The internal mixer according to claim 1, wherein both ends of each of the long blades are cut off to form a flow path for the material to be kneaded therein . 前記各短翼は、前記各ロータの回転により、前記ロータの前記一端部あるいは前記他端部から中央部に向かって被混練物が流動するように配置されていることを特徴とする請求項１または２記載の密閉式混練機。The said each short wing is arrange | positioned so that an object to be kneaded may flow toward the center part from the said one end part or the said other end part of the said rotor by rotation of each said rotor. Or the internal mixer according to 2 above.
JP02526996A 1996-02-13 1996-02-13 Closed kneader Expired - Lifetime JP3553260B2 (en)

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JP02526996A JP3553260B2 (en) 1996-02-13 1996-02-13 Closed kneader

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JPH09216224A JPH09216224A (en) 1997-08-19
JP3553260B2 true JP3553260B2 (en) 2004-08-11

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JP4781725B2 (en) * 2005-06-09 2011-09-28 三菱重工業株式会社 Continuous kneader
JP4568785B2 (en) * 2009-01-19 2010-10-27 株式会社神戸製鋼所 Kneading rotor
JP4542605B1 (en) * 2009-04-15 2010-09-15 株式会社神戸製鋼所 Closed kneading machine and kneading rotor
JP5792650B2 (en) * 2012-01-31 2015-10-14 株式会社神戸製鋼所 Kneading rotor and hermetic kneading machine including the same

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