JPH063554B2 - Ferrite carrier - Google Patents
Ferrite carrierInfo
- Publication number
- JPH063554B2 JPH063554B2 JP60177814A JP17781485A JPH063554B2 JP H063554 B2 JPH063554 B2 JP H063554B2 JP 60177814 A JP60177814 A JP 60177814A JP 17781485 A JP17781485 A JP 17781485A JP H063554 B2 JPH063554 B2 JP H063554B2
- Authority
- JP
- Japan
- Prior art keywords
- particle size
- carrier
- ferrite
- magnetic force
- carrier particles
- 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.)
- Expired - Lifetime
Links
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G9/00—Developers
- G03G9/08—Developers with toner particles
- G03G9/10—Developers with toner particles characterised by carrier particles
- G03G9/107—Developers with toner particles characterised by carrier particles having magnetic components
- G03G9/108—Ferrite carrier, e.g. magnetite
- G03G9/1085—Ferrite carrier, e.g. magnetite with non-ferrous metal oxide, e.g. MgO-Fe2O3
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G9/00—Developers
- G03G9/08—Developers with toner particles
- G03G9/10—Developers with toner particles characterised by carrier particles
- G03G9/107—Developers with toner particles characterised by carrier particles having magnetic components
- G03G9/1075—Structural characteristics of the carrier particles, e.g. shape or crystallographic structure
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Developing Agents For Electrophotography (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は安定した画像を与えるとともに付着、飛散のな
い二成分系現像用キャリアに関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a two-component developing carrier which gives a stable image and is free from adhesion and scattering.
［従来技術及び問題点］ 静電潜像現像剤として、キャリアとトナーとからなる二
成分系現像剤が広範に利用されている。キャリアは鉄粉
やフェライト粒子等の磁性体で形成され、例えば磁気ブ
ラシ式現像機に使用する場合、他極着磁磁気ロールの磁
束によりブラシ状となり、その表面にトナーを静電的に
担持する。磁気ブラシが静電潜像を保持する回転ドラム
と接触することにより、トナーのみドラム上に静電潜像
に沿って付着し、画像を形成する。一方キャリアは磁気
ロール上に残留し、新しいトナーを担持して再び現像に
利用される。このようにしてトナーのみ消費される。[Prior Art and Problems] As an electrostatic latent image developer, a two-component developer composed of a carrier and a toner is widely used. The carrier is made of a magnetic material such as iron powder or ferrite particles, and when used in a magnetic brush type developing machine, for example, it becomes a brush shape due to the magnetic flux of another pole magnetized magnetic roll, and electrostatically carries toner on its surface. . When the magnetic brush comes into contact with the rotating drum holding the electrostatic latent image, only the toner adheres to the drum along the electrostatic latent image to form an image. On the other hand, the carrier remains on the magnetic roll, carries new toner, and is reused for development. In this way, only the toner is consumed.
かかる二成分系現像剤用キャリアとして、フェライトキ
ャリアが広範に使用されている。フェライトは一般に三
価の酸化鉄と金属酸化物との化合物であり、組成に応
じ、種々の磁力のものがある。このようなフェライトを
して、例えば、Ｂａ−Ｎｉ−Ｚｎ−フェライト、Ｍｎ−
Ｚｎ−フェライト、Ｎｉ−Ｚｎ−フェライト、Ｌｉ−Ｚ
ｎ−フェライト、Ｃｕ−Ｚｎ−Ｍｇ−フェライト、Ｍｇ
−Ｚｎ−フェライト等がある。Ferrite carriers are widely used as carriers for such two-component developers. Ferrite is generally a compound of trivalent iron oxide and metal oxide, and has various magnetic forces depending on the composition. By using such ferrite, for example, Ba-Ni-Zn-ferrite, Mn-
Zn-ferrite, Ni-Zn-ferrite, Li-Z
n-ferrite, Cu-Zn-Mg-ferrite, Mg
-Zn-ferrite and the like.
一般に高磁力フェライトのキャリアを使用すると、磁気
ブラシは高くなりキャリア飛散はないが、磁気ブラシは
硬くなり、はけ筋が生じやすい。一方、低磁力フェライ
トのキャリアを使用すると、磁気ブラシは柔かくなり、
ハーフトーンの良好な画像が得られるが、キャリアの付
着や飛散が起りやすい。In general, when a carrier of high magnetic force ferrite is used, the magnetic brush becomes high and the carrier does not scatter, but the magnetic brush becomes hard and the streak tends to occur. On the other hand, if you use a carrier of low magnetic force ferrite, the magnetic brush becomes softer,
Images with good halftones can be obtained, but carrier adhesion and scattering easily occur.
またキャリア粒径の大小によっても現像に差ができる。
一般に大粒径のキャリアは流動性がよく飛散もないが、
ハーフトーンの画質は不十分である。一方、小粒径のキ
ャリアはハーフトーンの良好な画像を与えるが、付着、
飛散が起りやすく、また流動性も低い。Further, the development may differ depending on the size of the carrier particle size.
Generally, carriers with large particle size have good fluidity and do not scatter,
Halftone image quality is poor. On the other hand, a carrier with a small particle diameter gives a good halftone image, but adhesion,
It is easily scattered and has low fluidity.
特開昭58-140753号は平均粒径が10〜40μｍの小粒径キ
ャリアと平均粒径が40〜200μｍの大粒径キャリアとを
混合してなる二成分系現像剤用キャリアを開示してい
る。かかる混合キャリアは改善された流動性を有し、現
像装置の位置や内部構造等の制約が少なくなるが、単一
組成であるので、画像の改善は必ずしも満足すべきもの
ではなかった。Japanese Patent Application Laid-Open No. 58-140753 discloses a carrier for a two-component developer, which is a mixture of a small particle size carrier having an average particle size of 10 to 40 μm and a large particle size carrier having an average particle size of 40 to 200 μm. There is. Such a mixed carrier has improved fluidity and less restrictions on the position and internal structure of the developing device, but since it has a single composition, the improvement of the image is not always satisfactory.
従って、本発明の目的は流動性が良く、付着、飛散がな
く、良好な画質を与える二成分系現像剤用キャリアを提
供することである。Therefore, an object of the present invention is to provide a carrier for a two-component developer, which has good fluidity, does not adhere or scatter, and gives good image quality.
［問題点を解決するための手段］ 上記目的に鑑み鋭意研究の結果、本発明者は、高磁力−
小粒径のフェライトキャリアと低磁力−大粒径のフェラ
イトキャリアとを混合することにより上記目的を満足す
るキャリアを得ることができることを発見し、本発明を
完成した。[Means for Solving Problems] As a result of earnest research in view of the above object, the present inventor has found that
The present invention has been completed by discovering that a carrier satisfying the above object can be obtained by mixing a ferrite carrier having a small particle diameter and a ferrite carrier having a low magnetic force and a large particle diameter.
本発明の二成分系現像剤用キャリアは、65emu／ｇ以上
の飽和磁化を有し、平均粒径が10〜80μｍの高磁力−小
粒径フェライトキャリア粒子20〜80重量％と、65emu／
ｇ以下の飽和磁化を有し、平均粒径80μｍ〜200μｍの
低磁力−大粒径フェライトキャリア粒子80〜20重量％と
からなり、前記飽和磁化の差が少なくとも5emu／ｇであ
ることを特徴とする。The two-component developer carrier of the present invention has a saturation magnetization of 65 emu / g or more and an average particle size of 10 to 80 μm and a high magnetic force-small particle size ferrite carrier particles of 20 to 80% by weight, and 65 emu / g.
80% to 20% by weight of low magnetic force / large particle size ferrite carrier particles having a saturation magnetization of g or less and an average particle size of 80 μm to 200 μm, and the difference in saturation magnetization is at least 5 emu / g. To do.
高磁力フェライトキャリア粒子と低磁力フェライトキャ
リア粒子と飽和磁化の差は少なくとも5emu／ｇ、好まし
くは少なくとも7emu／ｇである。飽和磁化の差が5emu／
ｇ未満であると本発明の効果は十分でない。The difference in saturation magnetization between the high magnetic force ferrite carrier particles and the low magnetic force ferrite carrier particles is at least 5 emu / g, preferably at least 7 emu / g. Difference in saturation magnetization is 5emu /
If it is less than g, the effect of the present invention is not sufficient.
高磁力キャリア粒子は小粒径であり、低磁力キャリア粒
子は大粒径であるのが本発明の重要な特徴である。これ
により、キャリア粒子の磁力および粒径が画像に及ぼす
悪影響が緩和され、良好な画像が得られる。すなわち、
高磁力−小粒径キャリア粒子は付着、飛散なしに高い磁
気ブラシを生じ、鮮明な画像を与え、低磁力−大粒径キ
ャリア粒子はハーフトーンが良好な画像を与えるととも
に、大きな粒径により付着、飛散がない。かかる性質を
有する２種類のキャリア粒子を混合することにより、キ
ャリア付着、飛散がなく、磁気ブラシが十分高く、鮮明
かつハーフトーンが良好な画像を与える。これに対し
て、上記キャリア粒子−種類だけであると、上記特性の
満足な組合せを得ることができない。また反対に高磁力
−大粒径キャリア粒子と低磁力−小粒径キャリア粒子と
の組合せとすると、キャリア付着、飛散が顕著になるの
みならず、ハケスジが生じ、またハーフトーンも不十分
になる等、好ましくない。It is an important feature of the present invention that the high magnetic force carrier particles have a small particle size and the low magnetic force carrier particles have a large particle size. This alleviates the adverse effects of the magnetic force and particle size of the carrier particles on the image, and a good image can be obtained. That is,
High magnetic force-small particle size carrier particles produce a high magnetic brush without sticking and scattering, giving a clear image, and low magnetic force-large particle size carrier particles give a good halftone image and sticking due to large particle size. , There is no scattering. By mixing two kinds of carrier particles having such properties, carrier adhesion and scattering do not occur, the magnetic brush is sufficiently high, and a clear and good halftone image is provided. On the other hand, if only the above-mentioned carrier particles are used, a satisfactory combination of the above characteristics cannot be obtained. On the other hand, when a combination of high magnetic force-large particle size carrier particles and low magnetic force-small particle size carrier particles is used, not only carrier adhesion and scattering become noticeable, but also brush marks occur and halftone becomes insufficient. Etc. are not preferable.
なお上記キャリア粒子において小粒径とは10〜80μｍの
平均粒径をいい、大粒径とは80〜200μｍの平均粒径を
いう。好ましい組合せは30〜80μｍの平均粒径の小粒径
キャリア粒子と80〜150μｍの平均粒径の大粒径キャリ
ア粒子である。In the carrier particles, the small particle size means an average particle size of 10 to 80 μm, and the large particle size means an average particle size of 80 to 200 μm. A preferred combination is small particle size carrier particles having an average particle size of 30 to 80 μm and large particle size carrier particles having an average particle size of 80 to 150 μm.
高磁力−小粒径のキャリア粒子と低磁力−大粒径キャリ
ア粒子との混合比率は重量で20：80〜80：20である。上
記混合比率が20：80未満であると画像濃度が低く、また
80：20より高いとハーフトーンが不十分な画像が得られ
る。The mixing ratio of the high magnetic force-small particle size carrier particles and the low magnetic force-large particle size carrier particles is 20:80 to 80:20 by weight. When the mixing ratio is less than 20:80, the image density is low, and
When it is higher than 80:20, an image with insufficient halftone is obtained.
本発明のキャリア粒子は一般に以下の方法により得るこ
とができる。The carrier particles of the present invention can be generally obtained by the following method.
まずフェライトの原料を適当な配合比で混合する。First, the ferrite raw materials are mixed in an appropriate mixing ratio.
混合した原料を900℃〜1000℃の温度で0.5〜3.0時間仮
焼する。フェライト原料中にＢａＣＯ3等の炭酸化物が
ある場合、仮焼によりＣＯ2が除去される。仮焼はバッ
チ式及びロータリーキルン等による連続式のいずれによ
っても行なうことができる。The mixed raw materials are calcined at a temperature of 900 ° C to 1000 ° C for 0.5 to 3.0 hours. If there is a carbonate such as BaCO 3 in the ferrite raw material, calcination removes CO 2 . The calcination can be performed by either a batch system or a continuous system such as a rotary kiln.
フェライトの仮焼粉を約2.0μｍ以下の平均粒度を有す
るように微粉砕する。これにはスチールボールを粉砕媒
体とする湿式粉砕等の装置を用いる。The calcined powder of ferrite is pulverized to have an average particle size of about 2.0 μm or less. For this, a device such as wet crushing using a steel ball as a crushing medium is used.
フェライト微粉末を約10〜200μｍの粒度に造粒する。
造粒方法として、スプレードライヤー法、粉末をバイン
ダーとともにニーダで転動圧縮した後整粒する方法、押
出し法、振動又は流動層中でバインダーを噴霧して会合
する方法、回転パン上で転動する方法等がある。The ferrite fine powder is granulated to a particle size of about 10 to 200 μm.
As a granulation method, a spray dryer method, a method of rolling and compressing powder with a binder in a kneader and then sizing, an extrusion method, a method of spraying and associating a binder in a vibration or fluidized bed, and rolling on a rotating pan There are ways.
造粒粉を次に焼成する。焼成は1250℃〜1350℃の温度で
3〜5時間行なう。前述した温度で均一焼成を行なうには
匣鉢詰造粒粉を比較的長時間の保持時間で行なうのが適
当である。The granulated powder is then fired. Firing at a temperature of 1250 ℃ to 1350 ℃
Do for 3-5 hours. In order to carry out uniform firing at the above-mentioned temperature, it is appropriate to carry out the box-filled granulated powder for a relatively long holding time.
焼成したフェライトはロールクラッシャ等により解砕
し、適当な粒度分布を有するように分級する。The fired ferrite is crushed by a roll crusher or the like and classified so as to have an appropriate particle size distribution.
得られたキャリア粒子は必要に応じ樹脂被覆を施すこと
ができる。好ましい樹脂としてスチレン−アクリル系樹
脂（例えばスチレン−メチルメタクリレート、スチレン
−ブチルメタクリレート等）、エポキシ樹脂、スチレン
−ブタジエン樹脂、ブチラール樹脂、セルロース樹脂等
がある。The obtained carrier particles can be coated with a resin if necessary. Preferred resins include styrene-acrylic resins (for example, styrene-methyl methacrylate, styrene-butyl methacrylate, etc.), epoxy resins, styrene-butadiene resins, butyral resins, cellulose resins and the like.
［実施例］ 本発明を以下の実施例によりさらに詳細に説明する。[Examples] The present invention will be described in more detail by the following examples.
実施例１ ＮｉＯ0.4・ＺｎＯ0.6・Ｆｅ2Ｏ3の組成を有するＮｉ−
Ｚｎ系フェライトキャリアを準備し、その特性を測定し
たところ、飽和磁化σｓ＝75emu／ｇ、保磁力IＨｃ＝8
Ｏｅ及び電気抵抗＝7×108Ω・cmであった。また平均粒
径は70μｍであり、実質粒径範囲は37〜105μｍかつ88
μｍ以下の粒子は全体の85重量％であった。これを試料
Ａとする。Having the composition of Example 1 NiO0.4 · ZnO0.6 · Fe 2 O 3 Ni-
A Zn-based ferrite carrier was prepared and its characteristics were measured. Saturation magnetization σs = 75 emu / g, coercive force IHc = 8
Oe and electric resistance = 7 × 10 8 Ω · cm. The average particle size is 70 μm, and the real particle size range is 37 to 105 μm and 88.
85% by weight of the total particles were less than μm. This is designated as Sample A.
また、ＢａＯ0.13・ＮｉＯ0.17・ＺｎＯ0.33・Ｆｅ2Ｏ3
の組成を有するＢａ・Ｎｉ・Ｎｎ系フェライトキャリア
を準備し、その特性を測定したところ、飽和磁化σｓ＝
58emu／ｇ、保磁力IＨｃ＝25Ｏｅ及び電気抵抗＝8×108
Ω・cmであった。また平均粒径は100μｍであり、実質
粒径範囲は74〜149μｍ、かつ74μｍ以上の粒子は全体
の93重量％であった。これを試料Ｂとする。In addition, BaO0.13 · NiO0.17 · ZnO0.33 · Fe 2 O 3
A Ba.Ni.Nn-based ferrite carrier having the composition of was prepared and its characteristics were measured.
58emu / g, coercive force IHc = 25 Oe and electric resistance = 8 × 10 8
It was Ω · cm. The average particle size was 100 μm, the actual particle size range was 74 to 149 μm, and the particles having a particle size of 74 μm or more accounted for 93% by weight of the whole. This is designated as Sample B.
試料Ａ及びＢを種々の比率で混合し、これに負帯電型日
立金属製トナー（ＫＤＴ100）を４重量％の割合で混合
して、リコーのＦＴ4030型複写機により現像試験を行な
った。結果を以下の表１に示す。Samples A and B were mixed at various ratios, and a negatively charged type Hitachi Metals toner (KDT100) was mixed at a ratio of 4% by weight, and a development test was carried out by a Ricoh FT4030 type copying machine. The results are shown in Table 1 below.
実施例２ 実施例１の試料Ａ及びＢと同一組成で平均粒径が異なる
ものを作成し、Ａ／Ｂの比率（重量％）が50：50となる
ように混合した。このようにして得られたフェライトキ
ャリアを使用し、実施例１と同一の条件で現像試験を行
なった。結果を表２に示す。 Example 2 Samples A and B of Example 1 having the same composition but different average particle sizes were prepared and mixed so that the A / B ratio (% by weight) was 50:50. Using the ferrite carrier thus obtained, a development test was conducted under the same conditions as in Example 1. The results are shown in Table 2.
参考例 実施例２の試料Ａ及びＢをそれぞれ単独で使用し、実施
例１と同一の条件で現像試験を行なった。結果を表３
（ａ）及び表３（ｂ）に示す。 Reference Example A development test was performed under the same conditions as in Example 1, using the samples A and B of Example 2 respectively. The results are shown in Table 3.
It shows in (a) and Table 3 (b).
［発明の効果］ 本発明の二成分系現像剤用キャリアは、高磁力−小粒径
キャリアと低磁力−大粒径キャリア粒子とからなるの
で、キャリア付着や飛散がなく、鮮明かつハーフトーン
の良好な画像を与える。 [Advantages of the Invention] The carrier for two-component developer of the present invention is composed of high magnetic force-small particle size carrier and low magnetic force-large particle size carrier particles, so that there is no carrier adhesion or scattering and it is clear and halftone. Gives a good image.
Claims (1)
径80μｍ以下の高磁力−小粒径フェライトキャリア粒子
20〜80重量％と、65emu／ｇ以下の飽和磁化を有し、平
均粒径80μｍ以上の低磁力−大粒径フェライトキャリア
粒子80〜20重量％とからなり、前記飽和磁化の差が少な
くとも5emu／ｇであることを特徴とする二成分系現像剤
用キャリア。1. High magnetic force-small particle size ferrite carrier particles having a saturation magnetization of 65 emu / g or more and an average particle size of 80 μm or less.
20 to 80% by weight and 80 to 20% by weight of low magnetic force-large particle size ferrite carrier particles having an average particle size of 80 μm or more and having a saturation magnetization of 65 emu / g or less, and the saturation magnetization difference is at least 5 emu. A carrier for a two-component developer, wherein the carrier is / g.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60177814A JPH063554B2 (en) | 1985-08-13 | 1985-08-13 | Ferrite carrier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60177814A JPH063554B2 (en) | 1985-08-13 | 1985-08-13 | Ferrite carrier |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6238476A JPS6238476A (en) | 1987-02-19 |
| JPH063554B2 true JPH063554B2 (en) | 1994-01-12 |
Family
ID=16037555
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60177814A Expired - Lifetime JPH063554B2 (en) | 1985-08-13 | 1985-08-13 | Ferrite carrier |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH063554B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02130558A (en) * | 1988-11-11 | 1990-05-18 | Tomoegawa Paper Co Ltd | Two-component developer for dry processing for electrophotography |
| JP2006091183A (en) | 2004-09-21 | 2006-04-06 | Fuji Xerox Co Ltd | Developing device and image forming apparatus |
| JP6269526B2 (en) * | 2015-02-16 | 2018-01-31 | 京セラドキュメントソリューションズ株式会社 | Method for producing two-component developer |
-
1985
- 1985-08-13 JP JP60177814A patent/JPH063554B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6238476A (en) | 1987-02-19 |
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