JP2004113841A

JP2004113841A - Fluidized bed type grinding classifier

Info

Publication number: JP2004113841A
Application number: JP2002276543A
Authority: JP
Inventors: Nobuyasu Makino; 牧野　信康; Tetsuya Tanaka; 田中　哲也
Original assignee: Ricoh Co Ltd
Current assignee: Ricoh Co Ltd
Priority date: 2002-09-24
Filing date: 2002-09-24
Publication date: 2004-04-15

Abstract

<P>PROBLEM TO BE SOLVED: To enhance a grinding capacity and a classifying capacity by suppressing the whirling-up of a material to be ground toward a classification rotor to stagnate the material to be ground in the vicinity of a grinding nozzle until reaching grinding not only to wait the accelerated collision due to jet streams but also to prevent the unnecessary material to be ground from approaching the classification rotor. <P>SOLUTION: This fluidized bed type grinding classifier (counter jet mill type) is provided with a fluidized bed adjusting fixture which efficiently guides the material to be ground (target particle size approximate powder) ground by the mutual collision due to the jet streams of opposed grinding nozzles to a classifier arranged to an upper part and has a function for controlling the behavior (whirling-up) of the powder in a fluidized bed in order to enhance classifying and grinding capacities. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、トナー粉砕分級方法に関し、微粒子粉砕分級手段に応用される。
【０００２】
【従来の技術】
粉砕室周囲の複数の粉砕ノズルからジェットの噴流を室内中央に向けて水平に噴射して噴流を衝突させ、その中に含まれる被粉砕材料を粉砕させると共に流動層を形成し、この流動層の上昇流中から粉砕された材料を室上部に設けられた分級機により分級するタイプの流動層式粉砕分級機が従来より知られている。例えば、流動層式粉砕機方法として、特開平０６−２８５３８６号公報には、最適条件を手軽に設定できる手段が記載され、特開平０７−４７２９８号公報には、粉砕エネルギーの有効活用（マルチノズル）が記載され、特開平０８−２１５５９９号公報には、粉砕粒度の均一化、シャープな分布を得る手段が記載され、特開平１１−７０３４０号公報には、粉砕効率を向上させる手段（速度差、乱流制御）が記載され、特許第２５３１０２８号公報には、粉砕効率を向上させる手段（粉砕ノズル衝突効率）が記載され、特許第２９０４４０４号公報には、粉砕効率を向上させる手段（原材料供給制御）が記載され、特許第２９５８４０４号公報には、粉砕効率を向上させる手段（流動層内の固形物濃度の均一）が記載されている（特許文献１〜７参照。）。
【０００３】
【特許文献１】
特開平０６−２８５３８６号公報（第１頁左欄第３行目〜第４行目、目的）
【特許文献２】
特開平０７−４７２９８号公報（第２頁第２欄第４４行目〜末行目）
【特許文献３】
特開平０８−２１５５９９号公報（第１頁左欄第３行目〜第６行目、目的）
【特許文献４】
特開平１１−７０３４０号公報（第３頁第３欄第３１行目〜第３８行目）
【特許文献５】
特許第２５３１０２８号公報（第２頁第４欄第７行目〜第１３行目）
【特許文献６】
特許第２９０４４０４号公報（第３頁第５欄第９行目〜第１３行目）
【特許文献７】
特許第２９５８４０４号公報（第１頁第１欄第２行目〜第１４行目、
請求項１，２）
【０００４】
図１に示されるように、従来のカウンタージェットミルは、粉砕ノズル（１）より噴出するジェット噴流に被粉砕物（２）を導き、粉砕物（３）は流動化して舞上がり上部分級ロータ（４）によって分級され、粉砕上り（７）は排出管（５）より次工程に搬出される。その際、流動層内はジェット噴流の勢いによって被粉砕物の一部までもが舞上がり、分級ロータ廻りの粉体密度を必要以上に上昇させるため、分級精度が低下し粉砕上り品への粗大粒子混入および本来ならば回収されるべき粉砕粒径が再び粉砕の戻され過粉砕による微粉発生量の増加によって品質の低下や粉砕処理能力の低下が課題になっていた。
【０００５】
【発明が解決しようとする課題】
本発明の課題は、分級ロータ側への舞上がりを抑制し被粉砕物は粉砕に至るまで粉砕ノズル近傍に滞留しジェット噴流による加速衝突を待つと共に分級ロータ側への不必要な被粉砕物を接近させないことで粉砕能力と分級性能を向上させることである。
【０００６】
【課題を解決するための手段】
上記課題は、本発明の（１）「流動層式粉砕分級装置（カウンタージェットミル方式）において、対向する粉砕ノズルのジェット噴流で相互衝突し粉砕された被粉砕物（目的粒度近似粉）を効率良く上部に設置された分級装置に導き分級及び粉砕性能を高めるため流動層内に粉体の挙動（舞上り）を制御する機能を有する流動層調整治具を装着することを特徴とする流動層式粉砕分級装置」、（２）「装着する流動層調整治具の中心部コーンの径（Ｄｂ）は、流動層の内径（Ｄａ）に対し下記式（化１）を形成することを特徴とする前記第（１）項に記載の流動層式粉砕分級装置；
【０００７】
【化５】
１／１０×Ｄａ≦Ｄｂ≦５／１０×Ｄａ　　　　　…（化１）
」、（３）「装着する流動層調整治具の中心部コーンの高さ（Ｈｃ）は流動層の低部から分級ロータ下部までの高さ（Ｈａ）に対し下記式（化２）を形成することを特徴とする前記第（１）項または第（２）項に記載の流動層式粉砕分級装置；
【０００８】
【化６】
１／３０×Ｈａ≦Ｈｃ≦１０／３０×Ｈａ　　　　　…（化２）
」、（４）「装着する流動層調整治具の設置高さ（Ｈｂ）は流動層の低部から分級ロータ下部までの高さ（Ｈａ）に対し下記式（化３）を形成することを特徴とする前記第（１）項乃至第（３）項の何れかに記載の流動層式粉砕分級装置；
【０００９】
【化７】
１／１０×Ｈａ≦Ｈｂ≦５／１０×Ｈａ　　　　　…（化３）
」、（５）「装着する流動層調整治具の設置の上面に堆積防止コーン（６ｄ）を形成し頂角θが下記式（化４）を形成することを特徴とする前記第（１）項乃至第（４）項の何れかに記載の流動層式粉砕分級装置；
【００１０】
【化８】
３０°≦θ≦１２０°　　　　　…（化４）
」、（６）「装着する流動層調整治具の表面は耐磨耗性材料で形成されていることを特徴とする前記第（１）項乃至第（５）項の何れかに記載の流動層式粉砕分級装置」により達成される。
【００１１】
以下に、本発明を詳細に説明する。
本発明の第（１）項を解決する手段として、少なくとも図２に示す粉砕トナーの流動化時に発生する分級ロータ側への舞上がりを抑制し被粉砕物は粉砕に至るまで粉砕ノズル近傍に滞留しジェット噴流による加速衝突を待つと共に分級ロータ側への不必要な被粉砕物を接近させないことで粉砕能力と分級性能を向上させる機能を有し、拡大図に示すような流動層調整治具（６）を内部に装着することを特徴とする。流動層調整治具の一例構成も図２に示した。
即ち、この調整治具は、粉砕処理されたものを効率よく分級機に導くもので、粉砕処理され製品粒度に近いもの（目的粒度近似粉）以外は未粉砕あるいは粗大粒子を必要以上に上昇させることを防ぐものであり、未粉砕物（目的粒度に近似しないもの）は分級ローターへの接近を防ぐものである。
【００１２】
本発明の第（２）項に記載の流動式粉砕分級装置は、被粉砕物の割れ特性や要求粉砕粒径に応じて常に最適な舞上がりを保ち粉砕を行なうために、装着する流動層調整治具の中心部コーン（６ｃ）の上面径（Ｄｂ）は形態の変更が可能で、内径（Ｄａ）に対し下記式（化１）を形成することを特徴とする前記第（１）項に記載の流動層式粉砕分級装置である。
【００１３】
【化９】
１／１０×Ｄａ≦Ｄｂ≦５／１０×Ｄａ　　　　　…（化１）
【００１４】
本発明の第（３）項に記載の流動式粉砕分級装置は、装着する流動層調整治具の中心部コーン高さ（Ｈｃ）は被粉砕物の割れ特性や要求粉砕粒径に対して形態の変更を可能とし、被粉砕物の舞上がりの防止と同時に粉砕ノズルへの誘導をし易くするために流動層の低部から分級ロータ下部までの高さ（Ｈａ）に対し下記式（化２）を形成することを特徴とする前記第（１）項または第（２）項に記載の流動層式粉砕分級装置である。
【００１５】
【化１０】
１／３０×Ｈａ≦Ｈｃ≦１０／３０×Ｈａ　　　　　…（化２）
【００１６】
本発明の第（４）項に記載の流動式粉砕分級装置は、装着する流動層調整治具の設置高さ（Ｈｂ）は被粉砕物の割れ特性や要求粉砕粒径に対して舞上がり制御ができ最適な粉砕分級が行なえるように流動層の低部から分級ロータ下部までの高さ（Ｈａ）に対し下記式（化３）を形成することを特徴とする前記第（１）項乃至第（３）項の何れかに記載の流動層式粉砕分級装置である。
【００１７】
【化１１】
１／１０×Ｈａ≦Ｈｂ≦５／１０×Ｈａ　　　　　…（化３）
【００１８】
本発明の第（５）項の流動層式粉砕機は、装着する流動層調整治具の設置の上面に分級ロータ（４）で分級され再度粉砕されるべき粗粉あるいは被粉砕物の堆積防止を防止し安定した流動状態の中で粉砕分級を継続させるためにコーン（６ｄ）を形成し頂角θが下記式（化４）を形成することを特徴とする前記第（１）項乃至第（４）項の何れかに記載の流動層式粉砕分級装置である。
【００１９】
【化１２】
３０°≦θ≦１２０°　　　　　…（化４）
【００２０】
本発明の第（６）項に記載の流動層式粉砕分級装置は、装着する流動層調整治具の表面は粉砕分級による粉砕あるいは被粉砕物による磨耗や劣化を防止する手段として少なくとも耐磨耗性材料で形成されている耐磨耗性材料としてセラミック（アルミナ・炭化ケイ素）、溶射、焼入れ、タングステンカーバイト、タフライト、ステライト、ハードクロムメッキ、侵炭等を用いたことを特徴とする前記第（１）項乃至第（５）項の何れかに記載の流動層式粉砕分級装置である。
【００２１】
【実施例】
以下、実施例により詳細に説明する。
（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％の混合物をロールミルにて溶融混練し、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、図２のフローで拡大図に示す流動層調整治具を装着し、粉砕エアー圧力０．６Ｍｐａ分級ローター（３）で周速４５ｍ／ｓで粉砕したところ重量平均粒径６．５μｍで４μｍ以下微粉含有率が個数平均で４８ＰＯＰ．％、１６μｍ以下粗粉含有率が重量平均で０．７Ｖｏｌ％のトナー粒径を１２ｋｇ／ｈｒ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。
【００２２】
（比較例１）
請求項１と同一の混練品と粉砕分級条件を用いて図１に示す工程フローで図１に示す従来型で粉砕をおこなったところ、重量平均粒径６．７μｍで４μｍ以下微粉含有率が個数平均で４８ＰＯＰ．％、１６μｍ以下粗粉含有率が重量平均で１．０Ｖｏｌ％のトナー粒径を１０ｋｇ／ｈｒ得ることができた。
【００２３】
（実施例２）
請求項１の混練品と粉砕分級条件を用いて中心部コーン６ｃの上面径ＤｂをＤｂ＝２／１０×Ｄａで粉砕したところ重量平均粒径６．５μｍで４μｍ以下微粉含有率が個数平均で４７ＰＯＰ．％、１６μｍ以下粗粉含有率が重量平均で０．６Ｖｏｌ％のトナー粒径を１３ｋｇ／ｈｒ得ることができた。
【００２４】
（実施例３）
請求項１の混練品と粉砕分級条件を用いて中心部コーン高さＨｃをＨｃ＝３／３０×Ｈａで粉砕したところ重量平均粒径６．５μｍで４μｍ以下微粉含有率が個数平均で４７ＰＯＰ．％、１６μｍ以下粗粉含有率が重量平均で０．５Ｖｏｌ％のトナー粒径を１３ｋｇ／ｈｒ得ることができた。
【００２５】
（実施例４）
請求項１の混練品と粉砕分級条件を用いて流動層調整治具の高さＨｂをＨｂ＝２／１０Ｈａで粉砕したところ重量平均粒径６．５μｍで４μｍ以下微粉含有率が個数平均で４６ＰＯＰ．％、１４μｍ以下粗粉含有率が重量平均で０．４Ｖｏｌ％のトナー粒径を１４ｋｇ／ｈｒ得ることができた。
【００２６】
（実施例５）
請求項１の混練品と請求項４の粉砕分級条件を用いて装着する流動層調整治具の設置の上面に堆積防止コーン６ｄを装着し、その頂角をθ＝６０°で１５００ｋｇ粉砕処理した重量平均粒径６．５μｍで４μｍ以下微粉含有率が個数平均で４６ＰＯＰ．％、１６μｍ以下粗粉含有率が重量平均で０．４Ｖｏｌ％のトナー粒径を１５ｋｇ／ｈｒ得ることができ終了後、流動層調整治具にトナーの堆積、付着の形跡はなかった。
【００２７】
（実施例６）
請求項５の粉砕分級条件を用いて流動層調整治具にタングステンカーバイトを施し１５００ｋｇ粉砕処理したところ重量平均６．５μｍで４μｍ以下微粉含有率が個数平均で４６ＰＯＰ．％、１６μｍ以下粗粉含有率が重量平均で０．４Ｖｏｌ％のトナー粒径を１５ｋｇ／ｈｒ得ることができ終了後、流動層調整治具に損傷あるいは磨耗の形跡はなかった。
【００２８】
【発明の効果】
以上、詳細かつ具体的な説明から明らかなように、本発明の請求項１〜４により、従来法と比べジェット噴流中の被粉砕物は流動層調整治具によって分級ロータ廻りへの被粉砕物の舞上がりが減少し、粉砕粒径への粗大粒子飛込みの減少ならびに舞上がり分級ロータ廻りの粉体密度を抑制できるため分級性能が向上し粉砕処理能力の向上ならびに微粉の発生量が減少する。
また、本発明の請求項５により、流動層調整治具に堆積防止コーンを装着したことで流動層内部の流動が安定し、粉砕処理能力の向上ならびに微粉の発生量が長期にわたって減少する。
また、本発明の請求項６により、流動層調整治具ならびに堆積防止コーンリングノズルの耐磨耗処理によって高処理能力を長期にわたって持続させることが可能となる。
【図面の簡単な説明】
【図１】従来の流動層式粉砕装置を示す図である。
【図２】本発明における流動層式粉砕装置及び流動層調整治具の一部構成を示した図である。
【図３】本発明における流動層式粉砕装置を示した別の図である。
【図４】本発明における流動層調整治具の一部構成を示した別の図である。
【符号の説明】
１　粉砕ノズル
２　原料粒子
３　粉砕物
４　分級ロータ
５　排出管
６　流動層調整治具
６ａ　固定ネジ（流動層調整治具）
６ｂ　流動層調整リング（流動層調整治具）
６ｃ　コーン（流動層調整治具）
６ｄ　堆積防止コーン
７　粉砕上り
Ｄａ　流動層の内径
Ｄｂ　コーンの径
Ｈａ　高さ
Ｈｂ　高さ
Ｈｃ　高さ[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a toner pulverization and classification method, and is applied to a fine particle pulverization and classification means.
[0002]
[Prior art]
A plurality of pulverizing nozzles around the pulverizing chamber jet a jet jet horizontally toward the center of the chamber to collide the jet, pulverize the material to be pulverized contained therein and form a fluidized bed. 2. Description of the Related Art A fluidized bed pulverizing classifier of a type in which a material pulverized from an ascending flow is classified by a classifier provided at an upper part of a chamber is conventionally known. For example, as a fluidized bed pulverizer method, Japanese Patent Application Laid-Open No. 06-285386 describes means for easily setting optimum conditions, and Japanese Patent Application Laid-Open No. 07-47298 describes an effective use of pulverization energy (multi-nozzle). Japanese Patent Application Laid-Open No. 08-215599 describes means for obtaining uniform and sharp distribution of the pulverized particle size, and Japanese Patent Application Laid-Open No. 11-70340 discloses a means for improving the pulverization efficiency (speed difference). Japanese Patent No. 2531028 describes means for improving the grinding efficiency (crush nozzle collision efficiency), and Japanese Patent No. 2904404 describes a means for improving the grinding efficiency (raw material supply). And Japanese Patent No. 2958404 describes a means for improving the pulverizing efficiency (uniform solid matter concentration in a fluidized bed). To 7 reference.).
[0003]
[Patent Document 1]
JP-A-06-285386 (page 1, left column, third line to fourth line, purpose)
[Patent Document 2]
JP-A-07-47298 (page 2, column 2, line 44 to last line)
[Patent Document 3]
Japanese Patent Application Laid-Open No. 08-215599 (3rd line to 6th line, left column on page 1)
[Patent Document 4]
JP-A-11-70340 (page 3, column 3, line 31 to line 38)
[Patent Document 5]
Japanese Patent No. 2531028 (page 2, column 4, line 7 to line 13)
[Patent Document 6]
Japanese Patent No. 2904404 (page 3, column 5, line 9 to line 13)
[Patent Document 7]
Japanese Patent No. 2958404 (page 1, column 1, line 2 to line 14,
Claims 1 and 2)
[0004]
As shown in FIG. 1, the conventional counter-jet mill guides an object (2) to be jetted into a jet jet ejected from a pulverizing nozzle (1). Classified by 4), and the pulverized product (7) is carried out to the next step from the discharge pipe (5). At this time, even the part of the material to be crushed rises in the fluidized bed due to the force of the jet jet, and the powder density around the classification rotor increases more than necessary. The mixing and the size of the crushed particles that would otherwise be recovered were crushed again, and an increase in the amount of fine powder generated due to over-grinding had a problem of lowering the quality and lowering the crushing capacity.
[0005]
[Problems to be solved by the invention]
The object of the present invention is to suppress the rise to the classifying rotor side, the object to be crushed stays near the crushing nozzle until crushing, waits for accelerated collision by a jet jet, and approaches unnecessary crushed objects to the classifying rotor side. Not doing so is to improve the crushing ability and the classification performance.
[0006]
[Means for Solving the Problems]
The object of the present invention is to provide a fluidized bed pulverizing and classifying apparatus (counter jet mill method) of the present invention, which efficiently crushes and pulverizes the pulverized material (powder having a target particle size approximating) by mutually colliding with jet jets of opposing pulverizing nozzles. A fluidized bed equipped with a fluidized bed adjusting jig having a function of controlling the behavior (rising) of the powder in the fluidized bed in order to improve the classification and pulverization performance by guiding to a classifier installed well on the top. (2) "The diameter (Db) of the central cone of the fluidized bed adjusting jig to be attached is defined by the following formula (Formula 1) with respect to the inner diameter (Da) of the fluidized bed." Fluidized bed pulverizing and classifying apparatus according to the above (1),
[0007]
Embedded image
1/10 × Da ≦ Db ≦ 5/10 × Da (Formula 1)
(3) "The height (Hc) of the center cone of the fluidized bed adjusting jig to be mounted is expressed by the following formula (Formula 2) with respect to the height (Ha) from the lower part of the fluidized bed to the lower part of the classifying rotor. The fluidized bed pulverizing and classifying apparatus according to the above (1) or (2),
[0008]
Embedded image
1/30 × Ha ≦ Hc ≦ 10/30 × Ha (Formula 2)
And (4) "The installation height (Hb) of the fluidized bed adjusting jig to be attached is to form the following formula (Formula 3) with respect to the height (Ha) from the lower part of the fluidized bed to the lower part of the classification rotor. The fluidized bed pulverizing and classifying apparatus according to any one of the above items (1) to (3);
[0009]
Embedded image
1/10 × Ha ≦ Hb ≦ 5/10 × Ha (Formula 3)
(5) "(1) wherein the deposition preventing cone (6d) is formed on the upper surface of the installation of the fluidized bed adjusting jig to be mounted, and the apex angle θ forms the following formula (Formula 4). Item: A fluidized bed pulverizing and classifying apparatus according to any one of Items to (4);
[0010]
Embedded image
30 ° ≦ θ ≦ 120 ° (Formula 4)
(6) The flow according to any one of (1) to (5), wherein the surface of the fluidized bed adjusting jig to be mounted is formed of a wear-resistant material. A layer type pulverizing and classifying apparatus.
[0011]
Hereinafter, the present invention will be described in detail.
As means for solving the item (1) of the present invention, at least the rising of the pulverized toner shown in FIG. 2 toward the classifying rotor, which is generated at the time of fluidization, is suppressed, and the material to be pulverized stays near the pulverizing nozzle until pulverization. It has a function of improving the pulverizing ability and the classification performance by waiting for the acceleration collision by the jet jet and preventing unnecessary objects to be pulverized from approaching the classification rotor side. ) Is mounted inside. FIG. 2 also shows an example of the configuration of the fluidized bed adjusting jig.
That is, this adjusting jig guides the pulverized product to a classifier efficiently, and raises unpulverized or coarse particles more than necessary except those that are pulverized and close to the product particle size (approximate target particle size powder). The unground material (which does not approximate the target particle size) prevents access to the classification rotor.
[0012]
The fluidized-pulverizing and classifying apparatus described in the item (2) of the present invention is equipped with a fluidized-bed adjusting jig to be mounted in order to always carry out the pulverization in accordance with the cracking characteristics of the material to be pulverized and the required pulverized particle size. The upper surface diameter (Db) of the central cone (6c) of the tool can be changed in form, and the following formula (Formula 1) is formed with respect to the inner diameter (Da). Fluidized-bed pulverizer / classifier.
[0013]
Embedded image
1/10 × Da ≦ Db ≦ 5/10 × Da (Formula 1)
[0014]
In the fluidized pulverizing and classifying apparatus according to the above mode (3), the height of the center cone (Hc) of the fluidized bed adjusting jig to be mounted is determined by the cracking characteristics of the material to be pulverized and the required particle size. The height (Ha) from the lower part of the fluidized bed to the lower part of the classifying rotor is expressed by the following formula (Formula 2) in order to prevent the rising of the material to be crushed and to easily guide the material to the crushing nozzle at the same time. The fluidized-bed pulverizing and classifying apparatus according to the above (1) or (2), wherein
[0015]
Embedded image
1/30 × Ha ≦ Hc ≦ 10/30 × Ha (Formula 2)
[0016]
In the fluidized-type pulverizing and classifying apparatus described in the item (4) of the present invention, the installation height (Hb) of the fluidized-bed adjusting jig to be mounted can be controlled so as to control the cracking characteristics of the object to be pulverized and the required pulverized particle size. The following formulas (1) to (3) are characterized by forming the following formula (3) with respect to the height (Ha) from the lower part of the fluidized bed to the lower part of the classification rotor so that the most suitable pulverization classification can be performed. (3) A fluidized bed pulverizing and classifying apparatus according to any one of the above (3).
[0017]
Embedded image
1/10 × Ha ≦ Hb ≦ 5/10 × Ha (Formula 3)
[0018]
In the fluidized bed pulverizer according to the above mode (5), the coarse powder or the material to be pulverized to be classified and reground by the classifying rotor (4) on the upper surface of the installation of the fluidized bed adjusting jig to be mounted is prevented. (1) to (4), wherein a cone (6d) is formed and the apex angle θ forms the following formula (Formula 4) in order to prevent crushing and continue pulverization and classification in a stable fluidized state. (4) A fluidized bed pulverizing and classifying apparatus according to any one of the above (4).
[0019]
Embedded image
30 ° ≦ θ ≦ 120 ° (Formula 4)
[0020]
In the fluidized bed pulverizing and classifying apparatus according to the above mode (6), the surface of the fluidized bed adjusting jig to be mounted is at least abrasion resistant as a means for preventing abrasion or deterioration by pulverization or pulverized material. A ceramic (alumina / silicon carbide), thermal spraying, quenching, tungsten carbide, tafflite, stellite, hard chrome plating, carburizing, etc., as the wear-resistant material formed of a conductive material. The fluidized bed pulverizing and classifying apparatus according to any one of (1) to (5).
[0021]
【Example】
Hereinafter, an embodiment will be described in detail.
(Example 1)
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 is melt-kneaded by a roll mill, cooled, solidified, and coarsely ground by a hammer mill. The jig shown in the figure was attached, and pulverization was performed at a peripheral speed of 45 m / s with a pulverizing air pressure of 0.6 Mpa using a classifying rotor (3). When the weight average particle diameter was 6.5 μm, the fine powder content was 4 μm or less. 48 POP. %, 16 μm or less A toner particle diameter of 12 vol / hr having a coarse powder content of 0.7 Vol% in weight average was obtained. In measuring the particle size, a Multisizer manufactured by Coulter Counter was used.
[0022]
(Comparative Example 1)
Using the same kneaded product as in claim 1 and pulverization and classification conditions, the conventional type shown in FIG. 1 was pulverized according to the process flow shown in FIG. 1, and the fine powder content was 4 μm or less with a weight average particle size of 6.7 μm. On average 48 POP. %, 16 μm or less A toner particle diameter of 10 vol / hr having a coarse powder content of 1.0 Vol% in weight average was able to be obtained.
[0023]
(Example 2)
When the upper surface diameter Db of the central cone 6c is pulverized with Db = 2/10 × Da using the kneaded product of claim 1 and the pulverization classification condition, the weight average particle diameter is 6.5 μm and the fine powder content is 4 μm or less in number average. 47 POP. %, 16 μm or less. A toner particle diameter of 13 kg / hr having a coarse powder content of 0.6 Vol% in weight average was able to be obtained.
[0024]
(Example 3)
Using the kneaded product of claim 1 and the pulverization classification conditions, the center cone height Hc was pulverized at Hc = 3/30 × Ha. When the weight average particle diameter was 6.5 μm and the fine powder content was 4 μm or less, the number of fine particles was 47 POP. %, 16 μm or less A toner particle diameter of 13 kg / hr having a coarse powder content of 0.5 Vol% in weight average was obtained.
[0025]
(Example 4)
When the height Hb of the fluidized bed adjusting jig was crushed with Hb = 2/10 Ha using the kneaded product of claim 1 and crushing classification conditions, the weight average particle diameter was 6.5 μm, the fine powder content was 4 μm or less, and the fine powder content was 46 POP in number average. . %, 14 μm or less A toner particle diameter of 14 vol / hr having a coarse powder content of 0.4 Vol% in weight average was obtained.
[0026]
(Example 5)
A deposition prevention cone 6d is mounted on the upper surface of the installation of the kneaded product of claim 1 and the fluidized bed adjustment jig to be mounted using the pulverization classification condition of claim 4, and the agglomeration angle is set to θ = 60 ° and 1500 kg of pulverization processing is performed. Weight average particle size 6.5 μm, 4 μm or less Fine powder content is 46 POP. %, 16 μm or less A toner particle diameter of 15 kg / hr with a coarse powder content of 0.4 Vol% in weight average was obtained, and after the completion, there was no evidence of toner accumulation or adhesion on the fluidized bed adjusting jig.
[0027]
(Example 6)
According to the pulverization classification condition of claim 5, the fluidized bed adjusting jig is subjected to 1500 kg of tungsten carbide by a tungsten carbide pulverization method. As a result, the weight average particle size is 6.5 μm and the fine powder content is 4 μm or less. %, 16 μm or less A toner particle diameter of 15 kg / hr with a coarse powder content of 0.4 Vol% in weight average was obtained, and after completion, there was no evidence of damage or abrasion in the fluidized-bed adjusting jig.
[0028]
【The invention's effect】
As is apparent from the detailed and specific description above, according to claims 1 to 4 of the present invention, the object to be ground in the jet stream can be reduced by the fluidized bed adjusting jig around the classifying rotor. In this case, the size of the particles is reduced, the amount of coarse particles falling into the crushed particle size is reduced, and the powder density around the classifying rotor is reduced, so that the classification performance is improved, the pulverization processing capacity is improved, and the amount of fine powder generated is reduced.
Further, according to the fifth aspect of the present invention, by mounting the accumulation preventing cone on the fluidized bed adjusting jig, the flow inside the fluidized bed is stabilized, the pulverization processing capacity is improved, and the amount of generated fine powder is reduced over a long period of time.
Further, according to the sixth aspect of the present invention, it is possible to maintain a high processing capacity for a long period of time by abrasion resistant treatment of the fluidized bed adjusting jig and the deposition preventing cone ring nozzle.
[Brief description of the drawings]
FIG. 1 is a diagram showing a conventional fluidized bed pulverizer.
FIG. 2 is a view showing a partial configuration of a fluidized bed pulverizer and a fluidized bed adjusting jig according to the present invention.
FIG. 3 is another diagram showing a fluidized bed pulverizer according to the present invention.
FIG. 4 is another diagram showing a partial configuration of a fluidized bed adjusting jig according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pulverization nozzle 2 Raw material particles 3 Pulverized material 4 Classification rotor 5 Discharge pipe 6 Fluidized bed adjusting jig 6a Fixing screw (fluidized bed adjusting jig)
6b Fluidized bed adjusting ring (fluidized bed adjusting jig)
6c cone (fluidized bed adjustment jig)
6d Deposition prevention cone 7 Grinding up Da Fluidized bed inner diameter Db Cone diameter Ha Height Hb Height Hc Height

Claims

流動層式粉砕分級装置（カウンタージェットミル方式）において、対向する粉砕ノズルのジェット噴流で相互衝突し粉砕された被粉砕物（目的粒度近似粉）を効率良く上部に設置された分級装置に導き分級及び粉砕性能を高めるため流動層内に粉体の挙動（舞上り）を制御する機能を有する流動層調整治具を装着することを特徴とする流動層式粉砕分級装置。In a fluidized bed type pulverizer and classifier (counter jet mill system), the objects to be pulverized (powder with approximate target particle size) that collide with each other by jet jets of opposing pulverizing nozzles are efficiently guided to a classifier installed at the top, and classified. A fluidized bed pulverizing and classifying apparatus comprising a fluidized bed adjusting jig having a function of controlling the behavior (rising) of powder in the fluidized bed in order to enhance the pulverizing performance.

装着する流動層調整治具の中心部コーンの径（Ｄｂ）は、流動層の内径（Ｄａ）に対し下記式（化１）を形成することを特徴とする請求項１に記載の流動層式粉砕分級装置。

2. The fluidized bed system according to claim 1, wherein the diameter (Db) of the central cone of the fluidized bed adjusting jig to be mounted is expressed by the following formula (Formula 1) with respect to the inner diameter (Da) of the fluidized bed. Grinding classifier.

装着する流動層調整治具の中心部コーンの高さ（Ｈｃ）は流動層の低部から分級ロータ下部までの高さ（Ｈａ）に対し下記式（化２）を形成することを特徴とする請求項１または２に記載の流動層式粉砕分級装置。

The height (Hc) of the central cone of the fluidized bed adjusting jig to be mounted is defined by the following formula (Formula 2) with respect to the height (Ha) from the lower part of the fluidized bed to the lower part of the classification rotor. The fluidized-bed pulverizing and classifying apparatus according to claim 1 or 2.

装着する流動層調整治具の設置高さ（Ｈｂ）は流動層の低部から分級ロータ下部までの高さ（Ｈａ）に対し下記式（化３）を形成することを特徴とする請求項１乃至３の何れかに記載の流動層式粉砕分級装置。

The installation height (Hb) of the fluidized bed adjusting jig to be attached is defined by the following formula (Formula 3) with respect to the height (Ha) from the lower part of the fluidized bed to the lower part of the classification rotor. 4. A fluidized bed pulverizing and classifying apparatus according to any one of claims 1 to 3.

装着する流動層調整治具の設置の上面に堆積防止コーン（６ｄ）を形成し頂角θが下記式（化４）を形成することを特徴とする請求項１乃至４の何れかに記載の流動層式粉砕分級装置。

The method according to any one of claims 1 to 4, wherein a deposition prevention cone (6d) is formed on the upper surface of the installation of the fluidized bed adjusting jig to be mounted, and the apex angle θ forms the following formula (Formula 4). Fluidized bed pulverizer and classifier.

装着する流動層調整治具の表面は耐磨耗性材料で形成されていることを特徴とする請求項１乃至５の何れかに記載の流動層式粉砕分級装置。The fluidized bed pulverizing and classifying apparatus according to any one of claims 1 to 5, wherein a surface of the fluidized bed adjusting jig to be mounted is formed of a wear-resistant material.