JP2004275935A - Counter jet mill type pulverizing classifier - Google Patents
Counter jet mill type pulverizing classifier Download PDFInfo
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Abstract
Description
【０００１】
【発明の属する技術分野】
本発明は、電子写真用トナーの製造過程において、トナー原材料を混合、混練、冷却、粗粉砕した後の微粉砕工程に使用されるカウンタージェットミル方式粉砕分級機に関する。また、前記カウンタージェットミル方式粉砕分級機は、電子写真用トナーの製造過程のみならず、トナー製造工程に限らず、タルク、石灰、セラミック、樹脂、化粧品、染料、漢方薬等の鉱物原料、化学製品、薬品の等の材料に対する粉砕システムに対し採用可能である。
【０００２】
【従来の技術】
【特許文献１】
特開２０００−１０７６２６号公報
【特許文献２】
特開２０００−１１７１３７号公報
【特許文献３】
特許第２５２８３４８号公報
【０００３】
少なくとも、中心軸を有する粉砕室、該粉砕室内部に設置される衝突部材、および該衝突部材に向かって高速ガスを噴射するノズルからなる流動層型ジェット粉砕機であって、ノズルが多段に設置され、ノズルを真上からみたとき卜段のノズルと下段のノズルが重ならないことを特徴とする流動層型ジェット粉砕機が提案されている（特許文献１）。
【０００４】
少なくとも、中心軸を有する粉砕室、該粉砕室内部に設置され、粉砕室中心軸に中心を有する衝突部材、および該衝突部材に向かって高速ガスを噴射するノズルからなる流動層型ジェット粉砕機であって、粉砕室の断面積をＳ（ｍｍ２）、ノズルの断面積をＮ（ｍｍ２）としたときのＳ／Ｎが５０００〜１５０００であるノズルが６本以上設置されていることを特徴とする流動層型ジェット粉砕機が提案されている（特許文献２）。
【０００５】
粉砕室の側壁に原料供給管を設けるとともに、該供給管の下方に粉砕ノズルを複数個設けた気流式粉砕機において、前記粉砕ノズルを前記粉砕室の水平面内において略中心方向に向けて配設するとともに、前記粉砕室の中心位置に質量の大なるセンタコアを立設し、該粉砕ノズルから噴出するジェット気流により前記粉砕室内の原料を加速し、前記センタコアに衝突させて粉砕するようにしたことを特徴とする気流式粉砕装置が提案されている（特許文献３）。
【０００６】
【発明が解決しようとする課題】
従来のカウンタージェットミル式の粉砕分級機は、流動層内下部において、吐出し向かい合うノズルからジェット気流を吐出する際に、ノズル周辺の被粉砕物を同伴して加速し、被粉砕物同士を中央部で衝突させることで粉砕を行い、粉砕された被粉砕物は上部に配置された遠心分離式の分級機構により小粒径のものは機外の排出され、大粒径のものは機内に残されて、再度下部の粉砕部により再粉砕される構造となっている。しかしながら、現在の粉砕分級気においては、下部で粉砕され、小粒径化された被粉砕物が流動層内の対流の乱れにより、効率よく分級部に移動しておらず、分級部まで到達しないことから、機外へ排出すべき粒径に達しても適正に排出できず、この結果また粉砕部に戻り、過粉砕となってしまう。この結果、生産能力の低下、適正粒径の歩留まり低下となっている。
【０００７】
【課題を解決するための手段】
本発明は、粉砕室内に、対向し設置された粉砕ジェットノズル、および分級ローターを少なくとも有して構成されるカウンタージェットミル式粉砕分級機において、粉砕室内に内筒を設けることにより、前記課題を解決することができた。
すなわち、前記粉砕室内に前記内筒を設けることにより、該内筒は流動層内の気流の乱れを防ぎ、対流をうながすという作用効果を奏することが出来るので、被粉砕物が効率よく分級部に移動し、分級処理を受ける事ができるため、過粉砕の低減、生産効率を向上できる。
【０００８】
前記粉砕ジェットノズル、および分級ローターとしては、カウンタージェットミル式粉砕分級機で従来用いられてものが使用される。
また、カウンタージェットミル式粉砕分級機では、前記のように内筒を設けることにより、被粉砕物がより強制的に分級部に搬送されるが、これにより分級ローターに対し初速をもって突入する被粉砕物が多くなり、分級精度を悪化させることとなる。このため分級ローター下部に遮蔽板を設置するのが好ましい。前記遮蔽板を設置することにより、流動層下部での対流から、分級ローター中心に向かう流れを低減し、この結果、分級精度が向上し未粉砕粒径（大粒径）粉の排出を低減させることができ、生産効率が向上する。
前記遮蔽板は分級ローターの下部に設置されるが、各ローターに対応して前記遮蔽板を設けるのが好ましい。例えば、該遮蔽板は４ロータータイプの粉砕分級機では４枚、３ロータータイプの粉砕分級機では３枚となる。
また、カウンタージェットミル式粉砕分級機の構造をシンプルにするため、前記遮蔽板は内筒設置の保持具を兼ねていることが好ましい。
【０００９】
さらに、前記カウンタージェットミル式粉砕分級機は、下式（１）〜（５）の要件を満足するものが好ましい。
第１に、前記内筒が前記ノズル上部に設置され、該内筒の長さＨ２は、下式（１）の要件を満足するものである。
１／３ Ｈ１≦Ｈ２≦２／３ Ｈ１・・・・・・・・・・・（１）
（Ｈ１：分級ローター中心線Ｃ−Ｄと粉砕ノズル中心線Ａ−Ｂ間の高さ）
本発明のカウンタージェットミル式粉砕分級機は、前記要件（１）満足することにより、粉砕された被粉砕物をより正確に分級部に到達させ、効率よく分級処理を受ける事ができるため、過粉砕の低減、生産効率を向上できるという効果が奏される。
【００１０】
第２に、前記内筒の下部と粉砕ノズル中心線Ａ−Ｂ間までの距離Ｈ３が、下式（２）の要件を満足するものである。
５０ｍｍ≦Ｈ３≦１５０ｍｍ・・・・・・・・・・・・・・（２）
本発明のカウンタージェットミル式粉砕分級機は、前記要件（２）満足することにより、粉砕された被粉砕物をより正確に分級部に到達させ、効率よく分級処理を受ける事ができるため、過粉砕の低減、生産効率を向上できるという効果が奏される。
【００１１】
第３に、前記内筒の径Ｈ５が下式（３）の要件を満足するものである。
１／３ Ｈ４≦Ｈ５≦２／３ Ｈ４・・・・・・・・・・・（３）
（Ｈ４：粉砕機本体の内径）
本発明のカウンタージェットミル式粉砕分級機は、前記要件（３）満足することにより、粉砕された被粉砕物をより正確に分級部に到達させ、効率よく分級処理を受ける事ができるため、過粉砕の低減、生産効率を向上できるという効果が奏される。
【００１２】
第４に、遮蔽板の幅Ｈ６が、下式（４）の要件を満足するものであることを特徴とするカウンタージェットミル式粉砕分級機。
１／３ Ｈ７≦Ｈ６≦Ｈ７・・・・・・・・・・・・・・・・（４）
（Ｈ７：分級ローターの直径）
本発明のカウンタージェットミル式粉砕分級機は、前記要件（４）満足することにより、分級ローター中心に向かう突入流れを低減し、分級精度を向上させ、未粉砕粒径（大粒径）粉の排出を低減、生産効率を向上するという効果が奏される。
【００１３】
第５に、分級ローター下限と遮蔽板間の距離Ｈ８が、下式（５）の要件を満足するものであることを特徴とするカウンタージェットミル式粉砕分級機。
１／４ Ｈ７≦Ｈ８≦Ｈ７・・・・・・・・・・・・・・・・（５）
（Ｈ７：分級ローターの直径）
本発明のカウンタージェットミル式粉砕分級機は、前記要件（５）満足することにより、遮蔽板が内筒の保持具をかねる事で、カウンタージェットミル式粉砕分級機の構造をシンプル化できるという効果が奏される。
【００１４】
【実施例】
以下、本発明を実施例により、さらに具体的に説明する。
実施例１
ポリエステル樹脂７５重量％とスチレンアクリル共重合樹脂１０重量％とカーボンブラック１５重量％の混合物を２軸混練機にて溶融混練し、冷却固化した後ハンマーミルで粗粉砕したトナー原料を請求項１記載のカウンタージェットミル式粉砕分級機において、粉砕ノズルへ供給する圧縮エア圧力：０．５Ｍｐａ、分級ロータ周速：４０ｍ／ｓ、流動層内圧力：−５ｋｐａの条件で粉砕した結果、重量平均粒径：６．５μｍ、４μｍ以下微粉含有率（個数平均）：５８ｐｏｐ．％、１６μｍ以上粗粉含有率（重量平均）：１．２ｗｔ．％のトナーを１３ｋｇ／ｈの生産能力で得ることができた。この粒径測定に際しては、コールターカウンター社のマルチサイザーを用いた。
【００１５】
比較例１
実施例１と同一の混練品と粉砕分級条件を用いて、図６に示す従来のカウンタージェットミル式粉砕分級にて粉砕を行なった結果、重量平均粒径：６．５μｍ、４μｍ以下微粉含有率（個数平均）：６１ｐｏｐ．％、１６μｍ以上粗粉含有率（重量平均）：１．２ｗｔ．％のトナーを１０ｋｇ／ｈの生産能力で得ることができた。
【００１６】
実施例２
実施例１と同一の混練品と粉砕分級条件を用いて、図２に示す内筒長さＨ２を、分級ローター中心線Ｃ−Ｄと粉砕ノズル中心線Ａ−Ｂ間の高さＨ１に対し、Ｈ２＝１／２Ｈ１で装着したカウンタージェットミル式粉砕分級機で粉砕した結果、重量平均粒径：６．５μｍ、４μｍ以下微粉含有率（個数平均）：５９ｐｏｐ．％、１６μｍ以上粗粉含有率（重量平均）：１．２ｗｔ．％のトナーを１２ｋｇ／ｈの生産能力で得ることができた。
【００１７】
実施例３
実施例１と同一の混練品と粉砕分級条件を用いて、図２に示す内筒下部と粉砕ノズル中心線Ａ−Ｂ間までの距離Ｈ３を１００ｍｍで装着したカウンタージェットミル式粉砕分級機で粉砕した結果、重量平均粒径：６．５μｍ、４μｍ以下微粉含有率（個数平均）：５９ｐｏｐ．％、１６μｍ以上粗粉含有率（重量平均）：１．２ｗｔ．％のトナーを１３ｋｇ／ｈの生産能力で得ることができた。
【００１８】
実施例４
実施例１と同一の混練品と粉砕分級条件を用いて、図２に示す内筒径Ｈ５を粉砕機本体内径Ｈ４に対しＨ５＝１／２Ｈ４で装着したカウンタージェットミル式粉砕分級機で粉砕した結果、重量平均粒径：６．５μｍ、４μｍ以下微粉含有率（個数平均）：５８ｐｏｐ．％、１６μｍ以上粗粉含有率（重量平均）：１．２ｗｔ．％のトナーを１３ｋｇ／ｈの生産能力で得ることができた。
【００１９】
実施例５
実施例１と同一の混練品と粉砕分級条件を用いて、図３に示す遮蔽板を装着したカウンタージェットミル式粉砕分級機で粉砕した結果、重量平均粒径：６．５μｍ、４μｍ以下微粉含有率（個数平均）：５７ｐｏｐ．％、１６μｍ以上粗粉含有率（重量平均）：０．８ｗｔ．％のトナーを１４ｋｇ／ｈの生産能力で得ることができた。
【００２０】
実施例６
実施例１と同一の混練品と粉砕分級条件を用いて、図４に示す遮蔽板幅Ｈ６を分級ローターの直径Ｈ７に対しＨ６＝１／２Ｈ７で装着したカウンタージェットミル式粉砕分級機で粉砕した結果、重量平均粒径：６．５μｍ、４μｍ以下微粉含有率（個数平均）：５７ｐｏｐ．％、１６μｍ以上粗粉含有率（重量平均）：０．９ｗｔ．％のトナーを１４ｋｇ／ｈの生産能力で得ることができた。
【００２１】
実施例７
実施例１と同一の混練品と粉砕分級条件を用いて、図４に示す分級ローター下限と遮蔽板間距離Ｈ８を分級ローターの直径Ｈ７に対しＨ８＝１／２Ｈ７で装着したカウンタージェットミル式粉砕分級機で粉砕した結果、重量平均粒径：６．５μｍ、４μｍ以下微粉含有率（個数平均）：５７ｐｏｐ．％、１６μｍ以上粗粉含有率（重量平均）：０．８ｗｔ．％のトナーを１５ｋｇ／ｈの生産能力で得ることができた。
【００２２】
実施例８
実施例１と同一の混練品と粉砕分級条件を用いて、図５に示す内筒を遮蔽板にて保持したカウンタージェットミル式粉砕分級機で粉砕し、重量平均粒径：６．５μｍ、４μｍ以下微粉含有率（個数平均）：５７ｐｏｐ．％、１６μｍ以上粗粉含有率（重量平均）：０．８ｗｔ．％のトナーを１５ｋｇ／ｈの生産能力で得ることができた。
【００２３】
【発明の効果】
本発明のカウンタージェットミル式粉砕分級機は、粉砕された被粉砕物をより正確に分級部に到達させ、効率よく分級処理を受ける事ができるため、本発明により過粉砕の低減、生産効率を向上できるカウンタージェットミル式粉砕分級機を提供することができた。
【図面の簡単な説明】
【図１】本発明のカウンタージェットミル式粉砕分級機の断面図である。
【図２】本発明のカウンタージェットミル式粉砕分級機の構成要件であるＨ１、Ｈ２およびＨ３を説明したカウンタージェットミル式粉砕分級機の断面図である。
【図３】本発明の遮蔽板を設けたカウンタージェットミル式粉砕分級機の断面図である。
【図４】本発明のカウンタージェットミル式粉砕分級機の構成要件であるＨ６とＨ７を説明した断面図である。
【図５】本発明のカウンタージェットミル式粉砕分級機の構成要件である遮蔽板と分級ローターのローターとの対応関係を説明した断面図である。
【図６】内筒を設けていない従来のカウンタージェットミル式粉砕分級の断面図である。
【符号の説明】
Ｈ１ 分級ローター中心線Ｃ−Ｄと粉砕ノズル中心線Ａ−Ｂ間の高さ
Ｈ２ 内筒の長さ
Ｈ３ 前記内筒の下部と粉砕ノズル中心線Ａ−Ｂ間までの距離
Ｈ４ 粉砕機本体の内径
Ｈ５ 内筒の径
Ｈ６ 遮蔽板の幅
Ｈ７ 分級ローターの直径
Ｈ８ 分級ローター下限と遮蔽板間の距離[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a counter jet mill type pulverizing classifier used in a fine pulverizing step after mixing, kneading, cooling, and coarsely pulverizing toner raw materials in a process of producing an electrophotographic toner. Further, the counter-jet mill type pulverizer and classifier are used not only in the production process of the toner for electrophotography, but also in the production process of the toner, mineral raw materials such as talc, lime, ceramics, resins, cosmetics, dyes, and herbal medicines, and chemical products. It can be applied to a crushing system for materials such as chemicals.
[0002]
[Prior art]
[Patent Document 1]
JP 2000-107626 A [Patent Document 2]
JP 2000-117137 A [Patent Document 3]
Japanese Patent No. 2528348 [0003]
A fluidized bed jet pulverizer comprising at least a pulverizing chamber having a central axis, a collision member provided inside the pulverization chamber, and a nozzle for injecting high-speed gas toward the collision member, wherein the nozzle is provided in multiple stages. In addition, a fluidized bed jet pulverizer has been proposed in which, when the nozzle is viewed from directly above, the lower nozzle and the lower nozzle do not overlap (Patent Document 1).
[0004]
At least a pulverizing chamber having a central axis, a collision member installed inside the pulverization chamber and having a center at the central axis of the pulverizing chamber, and a fluidized bed jet pulverizer comprising a nozzle for injecting high-speed gas toward the collision member. In addition, six or more nozzles having an S / N of 5,000 to 15000 when the sectional area of the crushing chamber is S (mm 2 ) and the sectional area of the nozzle is N (mm 2 ) are provided. (Patent Document 2).
[0005]
A raw material supply pipe is provided on the side wall of the pulverizing chamber, and in an airflow type pulverizer provided with a plurality of pulverizing nozzles below the supply pipe, the pulverizing nozzle is disposed substantially in the horizontal plane of the pulverizing chamber in a substantially central direction. In addition, a center core having a large mass is erected at the center position of the pulverizing chamber, and the raw material in the pulverizing chamber is accelerated by a jet stream ejected from the pulverizing nozzle, and is crushed by colliding with the center core. An air-flow type pulverizer characterized by the following has been proposed (Patent Document 3).
[0006]
[Problems to be solved by the invention]
In the conventional counter jet mill type pulverizer, when a jet stream is discharged from the nozzles facing each other in the lower part of the fluidized bed, the pulverized substances around the nozzles are accelerated together and accelerated, and the pulverized substances are centered. The crushed material is discharged outside the machine by the centrifugal classification mechanism arranged at the top, and the crushed material is left inside the machine by the centrifugal classification mechanism. Then, it is structured to be crushed again by the lower crushing unit. However, in the current pulverized classification air, the material to be pulverized at the lower part and reduced in particle size is not efficiently moved to the classification part due to disturbance of convection in the fluidized bed and does not reach the classification part. For this reason, even if the particle diameter to be discharged to the outside of the machine is reached, it cannot be discharged properly, and as a result, it returns to the pulverizing section and is over-pulverized. As a result, the production capacity is reduced, and the yield of the appropriate particle size is reduced.
[0007]
[Means for Solving the Problems]
The present invention solves the above-described problems by providing an inner cylinder in a grinding chamber, in a counter jet mill-type grinding classifier configured to include at least a grinding jet nozzle and a classifying rotor that are installed facing each other in a grinding chamber. Could be solved.
That is, by providing the inner cylinder in the pulverizing chamber, the inner cylinder can prevent the turbulence of the air flow in the fluidized bed and have the effect of promoting convection. Since it can be moved and subjected to a classification process, excessive pulverization can be reduced and production efficiency can be improved.
[0008]
As the pulverizing jet nozzle and the classifying rotor, those conventionally used in a counter jet mill type pulverizing classifier are used.
Also, in the counter jet mill type pulverizing classifier, by providing the inner cylinder as described above, the pulverized material is more forcibly conveyed to the classification unit. The number of objects increases, and the classification accuracy deteriorates. For this reason, it is preferable to provide a shielding plate below the classifying rotor. By installing the shielding plate, the flow from the convection at the lower part of the fluidized bed toward the center of the classification rotor is reduced, and as a result, the classification accuracy is improved and the discharge of the unmilled particle size (large particle size) powder is reduced. Can improve production efficiency.
The shielding plate is installed below the classifying rotor, and it is preferable to provide the shielding plate for each rotor. For example, the number of the shielding plates is four in a four-rotor type pulverizer and classifier, and three in a three-rotor type pulverizer and classifier.
In addition, in order to simplify the structure of the counter jet mill type pulverizer and classifier, it is preferable that the shielding plate also serves as a holder for installing the inner cylinder.
[0009]
Further, it is preferable that the counter jet mill type pulverizing classifier satisfy the requirements of the following formulas (1) to (5).
First, the inner cylinder is installed above the nozzle, and the length H2 of the inner cylinder satisfies the requirement of the following equation (1).
1/3 H1 ≦ H2 ≦ 2/3 H1 (1)
(H1: height between the classification rotor center line CD and the grinding nozzle center line AB)
According to the counter jet mill type pulverizing classifier of the present invention, by satisfying the requirement (1), the pulverized material can more accurately reach the classification unit and can be efficiently subjected to the classification treatment. This has the effect of reducing pulverization and improving production efficiency.
[0010]
Second, the distance H3 between the lower portion of the inner cylinder and the center line AB of the crushing nozzle satisfies the requirement of the following expression (2).
50mm ≦ H3 ≦ 150mm (2)
According to the counter jet mill type pulverizing classifier of the present invention, by satisfying the requirement (2), the pulverized material can more accurately reach the classification unit and can be efficiently subjected to the classification process. This has the effect of reducing pulverization and improving production efficiency.
[0011]
Third, the diameter H5 of the inner cylinder satisfies the requirement of the following expression (3).
1/3 H4 ≦ H5 ≦ 2/3 H4 (3)
(H4: inner diameter of the crusher body)
According to the counter jet mill type pulverizing classifier of the present invention, by satisfying the requirement (3), the pulverized material can reach the classifying section more accurately and can be subjected to the classifying process efficiently. This has the effect of reducing pulverization and improving production efficiency.
[0012]
Fourth, a counter jet mill type pulverizing classifier characterized in that the width H6 of the shielding plate satisfies the requirement of the following formula (4).
1/3 H7 ≦ H6 ≦ H7 (4)
(H7: diameter of classification rotor)
By satisfying the requirement (4), the counter-jet mill-type pulverizing classifier of the present invention reduces the rush flow toward the center of the classification rotor, improves the classification accuracy, and reduces the unmilled particle size (large particle size) powder. This has the effect of reducing emissions and improving production efficiency.
[0013]
Fifth, a counter jet mill type pulverizing classifier characterized in that the lower limit of the classifying rotor and the distance H8 between the shielding plates satisfy the requirement of the following formula (5).
1/4 H7 ≦ H8 ≦ H7 (5)
(H7: diameter of classification rotor)
According to the counter jet mill type pulverizing classifier of the present invention, by satisfying the requirement (5), the structure of the counter jet mill type pulverizing classifier can be simplified by the shielding plate serving as a holder for the inner cylinder. Is played.
[0014]
【Example】
Hereinafter, the present invention will be described more specifically with reference to examples.
Example 1
2. A toner material obtained by melt-kneading a mixture of 75% by weight of a polyester resin, 10% by weight of a styrene-acrylic copolymer resin and 15% by weight of carbon black by a twin-screw kneader, solidifying by cooling, and coarsely pulverized by a hammer mill. Crushed under the conditions of compressed air pressure supplied to the crushing nozzle: 0.5 Mpa, classification rotor peripheral speed: 40 m / s, and fluidized bed pressure: -5 kpa, the weight average particle size : 6.5 µm, 4 µm or less Fine powder content (number average): 58 pop. %, Coarse powder content of 16 μm or more (weight average): 1.2 wt. % Toner was obtained with a production capacity of 13 kg / h. In measuring the particle size, a Coulter Counter Multisizer was used.
[0015]
Comparative Example 1
Using the same kneaded product as in Example 1 and pulverization classification conditions, pulverization was performed by a conventional counterjet mill type pulverization classification shown in FIG. 6, and as a result, the weight average particle diameter was 6.5 μm, and the content of fine powder was 4 μm or less. (Number average): 61 pop. %, Coarse powder content of 16 μm or more (weight average): 1.2 wt. % Toner could be obtained with a production capacity of 10 kg / h.
[0016]
Example 2
Using the same kneaded product and pulverization classification conditions as in Example 1, the inner cylinder length H2 shown in FIG. 2 was changed with respect to the height H1 between the classification rotor center line CD and the pulverization nozzle center line AB. As a result of pulverization with a counter jet mill type pulverizer and classifier equipped with H2 = 1 / 2H1, the weight average particle diameter was 6.5 μm, the fine powder content was 4 μm or less (number average): 59 pop. %, Coarse powder content of 16 μm or more (weight average): 1.2 wt. % Of toner could be obtained with a production capacity of 12 kg / h.
[0017]
Example 3
Using the same kneaded product and crushing classification conditions as in Example 1, crushing was performed with a counter jet mill crushing classifier equipped with a distance H3 of 100 mm between the lower portion of the inner cylinder and the center line AB of the crushing nozzle shown in FIG. As a result, the weight average particle diameter was 6.5 μm, the content of fine powder of 4 μm or less (number average): 59 pop. %, Coarse powder content of 16 μm or more (weight average): 1.2 wt. % Toner was obtained with a production capacity of 13 kg / h.
[0018]
Example 4
Using the same kneaded product and crushing classification conditions as in Example 1, the inner cylinder diameter H5 shown in FIG. 2 was crushed by a counter jet mill type crusher equipped with a crusher body inner diameter H4 at H5 = 1 / 2H4. As a result, weight average particle diameter: 6.5 μm, fine powder content of 4 μm or less (number average): 58 pop. %, Coarse powder content of 16 μm or more (weight average): 1.2 wt. % Toner was obtained with a production capacity of 13 kg / h.
[0019]
Example 5
Using the same kneaded product and crushing classification conditions as in Example 1, crushing was performed with a counter jet mill crushing classifier equipped with a shielding plate shown in FIG. 3, and as a result, the weight average particle diameter was 6.5 μm, containing 4 μm or less fine powder. Rate (number average): 57 pop. %, Coarse powder content of 16 μm or more (weight average): 0.8 wt. % Toner was obtained with a production capacity of 14 kg / h.
[0020]
Example 6
Using the same kneaded product and crushing classification conditions as in Example 1, crushing was performed with a counter jet mill type crushing classifier equipped with a shielding plate width H6 shown in FIG. 4 and H6 = 1 / 2H7 with respect to the diameter H7 of the classification rotor. As a result, weight average particle diameter: 6.5 μm, content of fine powder of 4 μm or less (number average): 57 pop. %, Coarse powder content of 16 μm or more (weight average): 0.9 wt. % Toner was obtained with a production capacity of 14 kg / h.
[0021]
Example 7
Using the same kneaded product and crushing classification conditions as in Example 1, a counter-jet mill crushing with the lower limit of the classification rotor and the distance H8 between the shield plates shown in FIG. 4 attached to the diameter H7 of the classification rotor at H8 = 1 / 2H7. As a result of pulverization with a classifier, the weight average particle size was 6.5 μm, the fine powder content was 4 μm or less (number average): 57 pop. %, Coarse powder content of 16 μm or more (weight average): 0.8 wt. % Toner was obtained with a production capacity of 15 kg / h.
[0022]
Example 8
Using the same kneaded product and crushing classification conditions as in Example 1, the inner cylinder shown in FIG. 5 was crushed with a counter jet mill crushing classifier held by a shielding plate, and the weight average particle diameter was 6.5 μm, 4 μm. The fine powder content (number average): 57 pop. %, Coarse powder content of 16 μm or more (weight average): 0.8 wt. % Toner was obtained with a production capacity of 15 kg / h.
[0023]
【The invention's effect】
The counter-jet mill type pulverizing classifier of the present invention allows the pulverized material to reach the classifying section more accurately and can be subjected to the classification process efficiently. A counter-jet mill-type pulverizing classifier that can be improved can be provided.
[Brief description of the drawings]
FIG. 1 is a sectional view of a counter jet mill type pulverizing classifier of the present invention.
FIG. 2 is a cross-sectional view of a counter jet mill type pulverizing classifier illustrating H1, H2, and H3 which are constituent components of the counter jet mill type pulverizing classifier of the present invention.
FIG. 3 is a sectional view of a counter jet mill type pulverizing classifier provided with a shielding plate of the present invention.
FIG. 4 is a cross-sectional view illustrating H6 and H7 which are constituent components of the counter-jet mill-type pulverizer / classifier of the present invention.
FIG. 5 is a cross-sectional view illustrating a correspondence between a shielding plate and a rotor of a classification rotor, which are constituent components of the counter-jet mill-type pulverizing and classifying machine of the present invention.
FIG. 6 is a cross-sectional view of a conventional counter jet mill type pulverization classification without an inner cylinder.
[Explanation of symbols]
H1 Height between the center line CD of the classification rotor and the center line AB of the crushing nozzle H2 Length of the inner cylinder H3 Distance between the lower part of the inner cylinder and the center line AB of the crushing nozzle H4 Inner diameter of the crusher body H5 Diameter of inner cylinder H6 Width of shielding plate H7 Diameter of classification rotor H8 Distance between lower limit of classification rotor and shielding plate
Claims (8)
１／３ Ｈ１≦Ｈ２≦２／３ Ｈ１・・・・・・・・・・・（１）
（Ｈ１：分級ローター中心線Ｃ−Ｄと粉砕ノズル中心線Ａ−Ｂ間の高さ）2. The counter according to claim 1, wherein the inner cylinder is installed above the nozzle, and the length H2 of the inner cylinder satisfies the following expression (1). Jet mill type pulverizing classifier.
1/3 H1 ≦ H2 ≦ 2/3 H1 (1)
(H1: height between the classification rotor center line CD and the grinding nozzle center line AB)
５０ｍｍ≦Ｈ３≦１５０ｍｍ・・・・・・・・・・・・・・（２）3. The pulverizing classifier according to claim 1, wherein a distance H <b> 3 between a lower part of the inner cylinder and a pulverizing nozzle center line AB satisfies a requirement of the following expression (2). 4. Counter jet mill type pulverizer and classifier.
50mm ≦ H3 ≦ 150mm (2)
１／３ Ｈ４≦Ｈ５≦２／３ Ｈ４・・・・・・・・・・・（３）
（Ｈ４：粉砕機本体の内径）The pulverizing classifier according to any one of claims 1 to 3, wherein the diameter H5 of the inner cylinder satisfies the requirement of the following formula (3).
1/3 H4 ≦ H5 ≦ 2/3 H4 (3)
(H4: inner diameter of the crusher body)
１／３ Ｈ７≦Ｈ６≦Ｈ７・・・・・・・・・・・・・・・（４）
（Ｈ７：分級ローターの直径）The counter-jet mill-type classifier according to claim 5, wherein the width (H6) of the shielding plate satisfies the requirement of the following formula (4).
1/3 H7 ≦ H6 ≦ H7 (4)
(H7: diameter of classification rotor)
１／４ Ｈ７≦Ｈ８≦Ｈ７・・・・・・・・・・・・・・（５）
（Ｈ７：分級ローターの直径）The pulverizing classifier according to claim 5 or 6, wherein the lower limit of the classifying rotor and the distance H8 between the shielding plates satisfy the requirement of the following formula (5). .
1/4 H7 ≦ H8 ≦ H7 (5)
(H7: diameter of classification rotor)
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003072888A JP4287173B2 (en) | 2003-03-18 | 2003-03-18 | Counter jet mill type pulverizer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003072888A JP4287173B2 (en) | 2003-03-18 | 2003-03-18 | Counter jet mill type pulverizer |
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| Publication Number | Publication Date |
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| JP2004275935A true JP2004275935A (en) | 2004-10-07 |
| JP4287173B2 JP4287173B2 (en) | 2009-07-01 |
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| JP2003072888A Expired - Fee Related JP4287173B2 (en) | 2003-03-18 | 2003-03-18 | Counter jet mill type pulverizer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010119929A (en) * | 2008-11-18 | 2010-06-03 | Kao Corp | Powder crusher |
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| JPH02227148A (en) * | 1988-10-05 | 1990-09-10 | Messer Griesheim Gmbh | Cold crushing method and apparatus |
| JPH0619836U (en) * | 1992-03-30 | 1994-03-15 | 株式会社栗本鐵工所 | Airflow type crusher |
| JPH10109045A (en) * | 1996-10-04 | 1998-04-28 | Babcock Hitachi Kk | Vertical roller mill |
| JPH11290711A (en) * | 1998-04-10 | 1999-10-26 | Hosokawa Micron Corp | Pulverizing system of air flow type pulverizer |
| JP2000015126A (en) * | 1998-06-29 | 2000-01-18 | Minolta Co Ltd | Fluidized-bed jet crusher |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52163277U (en) * | 1976-06-05 | 1977-12-10 | ||
| JPS6048155A (en) * | 1983-08-24 | 1985-03-15 | ジエ−ムズ ハウデン アンド カンパニ− リミテツド | Crusher |
| JPH02227148A (en) * | 1988-10-05 | 1990-09-10 | Messer Griesheim Gmbh | Cold crushing method and apparatus |
| JPH0619836U (en) * | 1992-03-30 | 1994-03-15 | 株式会社栗本鐵工所 | Airflow type crusher |
| JPH10109045A (en) * | 1996-10-04 | 1998-04-28 | Babcock Hitachi Kk | Vertical roller mill |
| JPH11290711A (en) * | 1998-04-10 | 1999-10-26 | Hosokawa Micron Corp | Pulverizing system of air flow type pulverizer |
| JP2000015126A (en) * | 1998-06-29 | 2000-01-18 | Minolta Co Ltd | Fluidized-bed jet crusher |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010119929A (en) * | 2008-11-18 | 2010-06-03 | Kao Corp | Powder crusher |
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| JP4287173B2 (en) | 2009-07-01 |
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