JPH0627742A - Manufacture of carrier for electrostatic charge development - Google Patents
Manufacture of carrier for electrostatic charge developmentInfo
- Publication number
- JPH0627742A JPH0627742A JP4204472A JP20447292A JPH0627742A JP H0627742 A JPH0627742 A JP H0627742A JP 4204472 A JP4204472 A JP 4204472A JP 20447292 A JP20447292 A JP 20447292A JP H0627742 A JPH0627742 A JP H0627742A
- Authority
- JP
- Japan
- Prior art keywords
- slurry
- magnetic powder
- carrier
- particles
- pts
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 239000002245 particle Substances 0.000 claims abstract description 31
- 239000002002 slurry Substances 0.000 claims abstract description 19
- 239000006247 magnetic powder Substances 0.000 claims abstract description 16
- 238000005245 sintering Methods 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000005520 cutting process Methods 0.000 claims abstract description 5
- 239000011230 binding agent Substances 0.000 claims description 7
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 abstract description 7
- 239000004372 Polyvinyl alcohol Substances 0.000 abstract description 4
- 239000003795 chemical substances by application Substances 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract description 4
- 229920002451 polyvinyl alcohol Polymers 0.000 abstract description 4
- 238000002156 mixing Methods 0.000 abstract description 3
- 238000004898 kneading Methods 0.000 abstract 2
- 239000000969 carrier Substances 0.000 abstract 1
- 229910000859 α-Fe Inorganic materials 0.000 description 10
- 239000000203 mixture Substances 0.000 description 5
- 239000000843 powder Substances 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 3
- 238000001694 spray drying Methods 0.000 description 2
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Landscapes
- Developing Agents For Electrophotography (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、静電荷現像用キャリア
の製造方法に関し、特に粒径の揃ったキャリアを効率よ
く製造する方法である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a carrier for electrostatic charge development, and particularly to a method for efficiently producing a carrier having a uniform particle size.
【０００２】[0002]
【従来の技術】従来フェライトキャリアは、特公昭５３
−１５０４０号公報、特公昭５６−５２３０５号等に開
示されるように、スプレードライ法により製造されてい
た。すなわち、フェライト形成酸化物の水スラリーを造
り、それに分散剤を加えた後、高圧で射出器の口径０．
５〜１．０ｍｍのノズルから高温熱気流中に噴霧して、
造粒乾燥していた。次に得られた粒子は１２５０〜１３
５０℃で３〜５時間燒結した。その後、クラッシャ等に
より解砕し、粒径の分級を行って希望粒径のキャリアを
得ていた。2. Description of the Related Art A conventional ferrite carrier is disclosed in Japanese Patent Publication Sho 53.
As disclosed in Japanese Patent Publication No. 15040, Japanese Patent Publication No. 56-52305, etc., it was produced by a spray dry method. That is, after making a water slurry of a ferrite-forming oxide and adding a dispersant thereto, the caliber of the injector is set to 0.
Spray from a nozzle of 5 to 1.0 mm into high temperature hot air,
It was granulated and dried. The particles obtained are then 1250-13
Sintered at 50 ° C. for 3-5 hours. After that, it was crushed by a crusher or the like and the particle size was classified to obtain a carrier having a desired particle size.
【０００３】[0003]
【発明が解決しようとする課題】従来のスプレードライ
法により製造されるフェライトキャリアでは、フェライ
トスラリーを高温熱気流中に噴霧する際、気相中ではス
ラリーの霧状粒子の集合度が種々異なり、生成する粒子
の粒径が不揃いとなり均一な粒径のキャリアを得ること
ができなかった。通常この方法で、例えば７０μｍの粒
径のフェライトキャリアを得ようとすると、できる粒子
の粒径分布は１０〜３００μｍと広範に亙り、これを分
級して７０μｍのキャリアを得ようとしても歩留が悪く
なるという間題があつた。In the ferrite carrier manufactured by the conventional spray dry method, when the ferrite slurry is sprayed in a high temperature hot air stream, the degree of aggregation of atomized particles of the slurry is different in the gas phase, The generated particles were not uniform in particle size, and a carrier having a uniform particle size could not be obtained. Usually, when it is attempted to obtain a ferrite carrier having a particle size of 70 μm by this method, the particle size distribution of the particles formed is as wide as 10 to 300 μm, and even if the particles are classified to obtain a carrier of 70 μm, the yield is high. There was a problem of getting worse.
【０００４】そこで本発明は、粒径の揃った静電荷現像
用キャリアを効率よく製造できるようにすることを目的
とした。Therefore, the present invention has an object to efficiently manufacture a carrier for electrostatic charge development having a uniform particle size.
【０００５】[0005]
【課題を解決するための手段】本発明は上記目的を達成
するために、磁性粉を用いた静電荷現像用キャリアの製
造方法において、主成分として磁性粉を４０〜９０重量
部と水を１０〜６０重量部とを混合して磁性粉のスラリ
ーを作成し、スラリー１００重量部に対して粘結剤１〜
２０重量部を混練し、この混練物を口径３０〜１５０μ
ｍの射出ノズルから細い線状に押し出し、この線状物を
前記口径とほぼ同一の長さに切断し、切断した粒子を燒
結した。燒結条件としては、１１００〜１４００℃で
０．５〜３時間保持して燒結するとよい。磁性粉４０〜
９０重量部に対して水を１０〜６０重量部の混合比でス
ラリーを作成したのは、好適な条件で水中に磁性粉が分
散するためである。さらに、スラリー１００重量部に対
して粘結剤１〜２０重量部の混合比としたのは、射出ノ
ズルから生成される混練物中のフェライト粒子の結着性
が十分に得られ、しかも粘結剤が多くなって磁気特性や
トナーの付着性にバラツキが生じるのを防ぐためであ
る。射出ノズルの口径を３０〜１５０μｍとしたのは、
最大トナー濃度を高くし、かつ耐久性を向上させ、画質
のキメを細かくするために、キャリア粒子の粒径を１５
０μｍ以下にして比表面積を増やす必要があるためであ
る。また、線状の混練物をノズル口径とほぼ同一の長さ
に切断したのは、線状物の外径と同一にして球状化し易
くするためである。燒結条件を１１００〜１４００℃、
０．５〜３時間としたのは、切断片の実部を溶融して十
分に球状化させるためであり、高温であれば加熱時間は
短くしてよい。In order to achieve the above object, the present invention provides a method of manufacturing a carrier for electrostatic charge development using magnetic powder, wherein 40 to 90 parts by weight of magnetic powder and 10 parts of water are used as main components. To 60 parts by weight to prepare a slurry of magnetic powder, and the binder 1 to 100 parts by weight of the slurry.
20 parts by weight is kneaded, and the kneaded product is calibrated with a diameter of 30 to 150 μ
A thin linear product was extruded from an m injection nozzle, the linear product was cut into a length substantially the same as the above-mentioned diameter, and the cut particles were sintered. As a sintering condition, it is preferable to hold at 1100 to 1400 ° C. for 0.5 to 3 hours and then to sinter. Magnetic powder 40 ~
The reason why the slurry was prepared with a mixing ratio of 10 to 60 parts by weight of water with respect to 90 parts by weight is that the magnetic powder is dispersed in water under suitable conditions. Further, the mixing ratio of 1 to 20 parts by weight of the binder with respect to 100 parts by weight of the slurry is that the binding property of the ferrite particles in the kneaded material produced from the injection nozzle can be sufficiently obtained, and This is to prevent variations in magnetic properties and toner adhesion due to an increase in the amount of the agent. The diameter of the injection nozzle is set to 30 to 150 μm.
In order to increase the maximum toner density, improve the durability, and make the image quality fine, the carrier particle size is set to 15
This is because it is necessary to increase the specific surface area to 0 μm or less. Further, the reason why the linear kneaded material was cut into a length substantially the same as the nozzle diameter is to make the linear kneaded material the same as the outer diameter of the linear material to facilitate spheroidization. Sintering conditions are 1100 to 1400 ° C,
The time of 0.5 to 3 hours is for melting the real part of the cut piece to be sufficiently spherical, and the heating time may be shortened at a high temperature.
【０００６】[0006]
【作用】本発明の製造方法では、磁性粉のスラリーと粘
結剤のポリビニルアルコールとを混練し、この混練物を
口径３０〜１５０μｍのノズルから、圧力を加えて細長
い線状に押し出し、この線状物をノズル口径とほぼ同一
の長さに切断して粒状化する。また、ノズル口径及び切
断する長さは、希望する粒径に合わせて設定できるた
め、これによって粒径の揃ったキャリア粒子を得ること
ができる。さらに、この粒子を１１００〜１４００℃で
０．５〜３時間燒結することにより、粒子を丸めて球状
化することができる。また、上記スラリー混練物中の粘
結剤のポリビニルアルコールは、この段階で除去され
る。In the manufacturing method of the present invention, a slurry of magnetic powder and polyvinyl alcohol as a binder are kneaded, and the kneaded product is extruded into a slender linear shape by applying pressure from a nozzle having a diameter of 30 to 150 μm. The material is cut into granules by cutting it into a length approximately the same as the nozzle diameter. Further, since the nozzle diameter and the cutting length can be set according to the desired particle size, carrier particles having a uniform particle size can be obtained. Further, by sintering the particles at 1100 to 1400 ° C. for 0.5 to 3 hours, the particles can be rounded and spheroidized. Further, polyvinyl alcohol as a binder in the slurry kneaded product is removed at this stage.
【０００７】[0007]
【実施例】本発明の製造方法に用いるフェライト粉末
は、次のように調製する。フェライト粉末の組成原料と
して、ＢａＯ：１５モル％、ＺｎＯ：１５モル％、Ｎｉ
Ｏ：１０モル％、Ｆｅ2 Ｏ3 ：６０モル％の割合でそれ
ぞれ秤量し、ボールミルで混合する。その後この混合物
を９００℃で２時間仮焼し、さらに湿式ボールミルで上
記フェライト粉末１００重量部に対して水を３０重量部
加えて５時間混合し、１μｍ以下になるように粉砕し
て、粉砕スラリーをつくる。このようにして得られた粉
砕スラリーに対して、粉砕スラリー１００重量部に対し
て粘結剤のポリビニルアルコールを３重量部加え、さら
に混練する。この混練物を口径１００μｍのノズルを有
する射出器に入れ、６０Ｋｇ／ｃｍ2 の圧力を加えて細
い線状に押し出す。押し出された線状物は、順次ワイヤ
ーカットで１００μｍの長さに切断し、希望粒径の粒子
にする。この粒子を１３００℃で２時間燒結し球状化す
る。これによって、粒径１００±２０μｍのフェライト
キャリアが得られる。EXAMPLES The ferrite powder used in the manufacturing method of the present invention is prepared as follows. As the composition raw material of the ferrite powder, BaO: 15 mol%, ZnO: 15 mol%, Ni
O: 10 mol% and Fe 2 O 3 : 60 mol% are weighed and mixed by a ball mill. After that, this mixture was calcined at 900 ° C. for 2 hours, 30 parts by weight of water was added to 100 parts by weight of the above ferrite powder in a wet ball mill, and the mixture was mixed for 5 hours, pulverized to 1 μm or less, and pulverized slurry. To make. To 100 parts by weight of the pulverized slurry, 3 parts by weight of polyvinyl alcohol as a binder is added to the pulverized slurry thus obtained, and the mixture is further kneaded. The kneaded product is put into an injector having a nozzle having a diameter of 100 μm, and a pressure of 60 Kg / cm 2 is applied to the kneaded product to be extruded into a thin linear shape. The extruded linear material is sequentially cut into pieces of 100 μm in length by wire cutting to obtain particles having a desired particle size. The particles are sintered at 1300 ° C. for 2 hours to make them spherical. As a result, a ferrite carrier having a particle size of 100 ± 20 μm can be obtained.
【０００８】さらに、本発明の製造方法によるキャリア
と従来の方法によるキャリアとでトナー濃度を３％にし
てそれぞれの現像剤を調製し、市販の電子写真複写機
（小西六社製ＵＢＩＸ−３０００機）にて作像し、得ら
れた画像の比較評価を行なった。その結果を表１に示
す。Further, each developer was prepared by adjusting the toner concentration to 3% by using the carrier according to the present invention and the carrier according to the conventional method, and a commercially available electrophotographic copying machine (UBIX-3000 machine manufactured by Konishi Rokusha Co., Ltd.) was prepared. ) And the obtained images were compared and evaluated. The results are shown in Table 1.
【表１】 上記表１から本発明の製造方法によるキャリアは、従来
法によるキャリアと比較して、画像上の諸特性で特に、
濃度、解像度、及び中間調で良好な結果が得られ、その
有効性が確認された。[Table 1] From Table 1 above, the carrier according to the manufacturing method of the present invention has various characteristics on an image, as compared with the carrier according to the conventional method.
Good results were obtained in density, resolution, and halftone, and their effectiveness was confirmed.
【０００９】上記燒結では、匣鉢中１３００℃で比較的
長時間保持することにより、均一な燒結を行うことがで
きる。また、磁性粉としてはＦｅ2 Ｏ3 の代わりにＦｅ
3 Ｏ4 で表示されるマグネタイト粉末やその他の磁性粉
を用いても構わない。さらに、本発明の製造方法により
得られたキャリアは、１０5 Ωcm以上の電気抵抗を有す
る。この抵抗は、内径３．０５ｍｍのテフロン（商品
名）製シリンダ中に試料を数１０ｍｇ充填し、１Ｋｇの
荷重下、２００Ｖ／ｃｍの直流電場を印加して測定す
る。In the above-mentioned sintering, a uniform sintering can be performed by holding it in a casket at 1300 ° C. for a relatively long time. As the magnetic powder, Fe 2 O 3 is used instead of Fe.
Magnetite powder represented by 3 O 4 or other magnetic powder may be used. Furthermore, the carrier obtained by the manufacturing method of the present invention has an electric resistance of 10 5 Ωcm or more. This resistance is measured by filling a cylinder of Teflon (trade name) having an inner diameter of 3.05 mm with several tens of mg of the sample and applying a DC electric field of 200 V / cm under a load of 1 kg.
【００１０】[0010]
【発明の効果】本発明の製造方法によれば、磁性粉末の
スラリーと粘結剤とを混練し、これを微細口径のノズル
から線状に押し出し、この線状物を希望の長さに切断し
て粒状化し、さらに燒結して球状化する。このため、粒
径の揃ったキャリアを効率よく製造することができ、ま
た、従来とは異なり製造したフェライトキャリアを最終
的に分級し、希望粒径のものを分別する必要がなくな
り、製造工程の省力化をも図ることができる。According to the manufacturing method of the present invention, a slurry of magnetic powder and a binder are kneaded, and the mixture is extruded linearly from a nozzle having a fine diameter, and the linear object is cut into a desired length. Then, it is granulated, and further sintered and spheroidized. Therefore, it is possible to efficiently manufacture a carrier having a uniform particle size, and unlike the conventional method, it is not necessary to finally classify the manufactured ferrite carrier and classify the one having a desired particle size. Labor saving can also be achieved.
Claims (2)
製造方法において、主成分として磁性粉を４０〜９０重
量部と水を１０〜６０重量部とを混合して磁性粉のスラ
リーを作成し、スラリー１００重量部に対して粘結剤１
〜２０重量部を混練し、この混練物を口径３０〜１５０
μｍの射出ノズルから細い線状に押し出し、この線状物
を前記口径とほぼ同一の長さに切断し、切断した粒子を
燒結することを特徴とする静電荷現像用キャリアの製造
方法。1. A method of manufacturing a carrier for electrostatic charge development using magnetic powder, wherein 40 to 90 parts by weight of magnetic powder and 10 to 60 parts by weight of water are mixed as main components to prepare a slurry of magnetic powder. Then, 1 part of the binder with respect to 100 parts by weight of the slurry
~ 20 parts by weight are kneaded, and the kneaded product is calibrated with a diameter of 30-150.
A method for producing a carrier for electrostatic charge development, comprising extruding a fine linear shape from an injection nozzle of μm, cutting this linear object to a length substantially the same as the above-mentioned diameter, and sintering the cut particles.
保持して燒結することを特徴とする請求項１に記載の静
電荷現像用キャリアの製造方法。2. The method for producing a carrier for electrostatic charge development according to claim 1, which is held at 1100 to 1400 ° C. for 0.5 to 3 hours to be sintered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4204472A JPH0627742A (en) | 1992-07-08 | 1992-07-08 | Manufacture of carrier for electrostatic charge development |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4204472A JPH0627742A (en) | 1992-07-08 | 1992-07-08 | Manufacture of carrier for electrostatic charge development |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0627742A true JPH0627742A (en) | 1994-02-04 |
Family
ID=16491100
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4204472A Pending JPH0627742A (en) | 1992-07-08 | 1992-07-08 | Manufacture of carrier for electrostatic charge development |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0627742A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2745848A1 (en) * | 1996-03-08 | 1997-09-12 | Honda Motor Co Ltd | Two-stroke spark ignition internal combustion engine with combustion control |
-
1992
- 1992-07-08 JP JP4204472A patent/JPH0627742A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2745848A1 (en) * | 1996-03-08 | 1997-09-12 | Honda Motor Co Ltd | Two-stroke spark ignition internal combustion engine with combustion control |
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