JP2001132732A - Method of manufacturing conductive roller and conductive roller obtained by the same - Google Patents
Method of manufacturing conductive roller and conductive roller obtained by the sameInfo
- Publication number
- JP2001132732A JP2001132732A JP31417199A JP31417199A JP2001132732A JP 2001132732 A JP2001132732 A JP 2001132732A JP 31417199 A JP31417199 A JP 31417199A JP 31417199 A JP31417199 A JP 31417199A JP 2001132732 A JP2001132732 A JP 2001132732A
- Authority
- JP
- Japan
- Prior art keywords
- average particle
- coating film
- silica
- coating
- roll
- 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.)
- Granted
Links
Landscapes
- Dry Development In Electrophotography (AREA)
- Rolls And Other Rotary Bodies (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、複写機やプリンタ
ー等の電子写真装置に用いられる現像ロール等の導電ロ
ールの製造方法およびそれにより得られる導電ロールに
関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a conductive roll such as a developing roll used in an electrophotographic apparatus such as a copying machine or a printer, and a conductive roll obtained by the method.
【0002】[0002]
【従来の技術】一般に、電子写真複写装置による複写は
つぎのようにして行われる。すなわち、軸中心に回転す
る感光ドラムの外周面に原稿像を静電潜像として形成
し、これにトナーを付着させてトナー像を形成すること
により行われる。このようにして感光ドラム表面に形成
された静電潜像にトナー像を形成させる方法の一例とし
て、現像ロールを用いた方式が採られている。すなわ
ち、現像ロール表面に付着したトナーを摩擦帯電させ、
感光ドラム表面の静電潜像に対して、電気的吸引力を応
用して移行させることにより、感光ドラム表面にトナー
像を形成することが行われる。このトナー像が、複写紙
上に定着されることにより複写が行われる。2. Description of the Related Art Generally, copying by an electrophotographic copying machine is performed as follows. That is, the image formation is performed by forming a document image as an electrostatic latent image on the outer peripheral surface of the photosensitive drum rotating about the axis, and attaching toner to the image to form a toner image. As an example of a method of forming a toner image on the electrostatic latent image formed on the surface of the photosensitive drum in this manner, a method using a developing roll is employed. That is, the toner adhering to the developing roll surface is frictionally charged,
A toner image is formed on the surface of the photosensitive drum by transferring the electrostatic latent image on the surface of the photosensitive drum by applying an electric attraction force. Copying is performed by fixing the toner image on copy paper.
【0003】上記現像ロールは、これまでは、芯金から
なる軸体と、その外周に形成されたゴム層とから構成さ
れており、ゴム層の表面をショットブラスト,研磨等で
疎面化することが行われていた。しかし、近年、現像ロ
ールの低硬度化の要求が高まり、ゴム層が低硬度化した
ことから、ゴム層に対するショットブラスト加工等が難
しくなり、上記ゴム層の上に、粗さ形成用の充填材を含
有した塗膜を形成することが行われている。Conventionally, the above-mentioned developing roll is composed of a shaft made of a metal core and a rubber layer formed on the outer periphery thereof, and the surface of the rubber layer is roughened by shot blasting, polishing or the like. That was being done. However, in recent years, there has been an increasing demand for lowering the hardness of the developing roll, and since the rubber layer has become lower in hardness, it becomes difficult to perform shot blasting or the like on the rubber layer, and a filler for forming a roughness is formed on the rubber layer. It has been performed to form a coating film containing.
【0004】特に、最近では、上記塗膜に関し、現像ロ
ール自体の耐圧性を高めるため、カーボンブラック等の
導電剤を用いずに電気抵抗を高くする要求がある。この
ため、粗さ形成用の充填材として非導電性粒子を用い、
この粒子を調整し、表面粗さを調整することが行われ
る。このような非導電性粒子を含む塗膜は、例えば、ロ
ールコート法により、つぎのようにして形成される。す
なわち、図5に示すように、軸体の外周にゴム層が形成
されたベースロール31を垂直にし、それを周方向に回
転させながらその外周面に、非導電性粒子入りの塗膜形
成用溶液をもつ塗布ローター(図示せず)を接しさせ、
上方から下方に向かって相対的に移動させることによ
り、塗布部32を形成する。この状態で、しばらく放置
すると、螺旋状塗布部と塗布部の間の地肌の部分33
に、それより上方の塗布部の溶液が、液垂れし塗布部化
する。ついで乾燥を行う。このようにしてベースロール
31の外周の全体に塗膜面が形成される。In particular, recently, with respect to the above-mentioned coating film, there is a demand for increasing the electric resistance without using a conductive agent such as carbon black in order to increase the pressure resistance of the developing roll itself. For this reason, using non-conductive particles as a filler for forming the roughness,
The particles are adjusted to adjust the surface roughness. The coating film containing such non-conductive particles is formed, for example, by a roll coating method as follows. That is, as shown in FIG. 5, a base roll 31 having a rubber layer formed on the outer periphery of a shaft body is made vertical, and the base roll 31 is rotated in the circumferential direction to form a coating film containing non-conductive particles on its outer peripheral surface. A coating rotor (not shown) having a solution is brought into contact therewith,
The application section 32 is formed by relatively moving from above to below. If left in this state for a while, the background portion 33 between the spiral coating portion and the coating portion
Then, the solution in the application section above it drips and becomes an application section. Then, drying is performed. In this way, the coating surface is formed on the entire outer periphery of the base roll 31.
【0005】[0005]
【発明が解決しようとする課題】このようにして塗膜を
形成すると、場合によって、螺旋状塗布部と塗布部の間
の地肌の部分の塗膜の膜厚と、塗布部の塗膜の膜厚と、
に差が生じ、塗膜全体が均一厚にならず、塗膜が凹凸に
なり、その結果、塗膜表面の粗面も均一にならないとい
う問題が生じた。When the coating film is formed in this manner, the thickness of the coating film on the background portion between the spiral coating portion and the coating portion may be reduced depending on the case. Thick and
, The entire coating film does not have a uniform thickness, and the coating film has irregularities. As a result, there is a problem that the rough surface of the coating film is not uniform.
【0006】本発明は、このような事情に鑑みなされた
もので、ロール外周面の塗膜の膜厚が均一で、しかも表
面粗さも均一な導電ロールの製造方法およびそれにより
得られる導電ロールの提供をその目的とする。The present invention has been made in view of such circumstances, and a method of manufacturing a conductive roll having a uniform coating film thickness on the outer peripheral surface of the roll and a uniform surface roughness, and a conductive roll obtained by the method. Its purpose is to provide.
【0007】[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、本発明は、外周にゴム層が形成された軸体および塗
膜形成用溶液を準備する工程と、上記ゴム層付きの軸体
を略垂直にした状態でゴム層の外周面に塗膜形成用溶液
を螺旋状に塗布する工程と、上記塗膜形成用溶液を塗布
したゴム層付きの軸体を乾燥し、軸体のゴム層の外周面
に上記塗膜形成用溶液からなる塗膜層を形成する工程と
を備え、上記塗膜形成用溶液が塗膜形成用のマトリック
ス成分、下記の(A)および(B)成分を含有している
導電ロールの製造方法を第1の要旨とし、それによって
得られた導電ロールを第2の要旨とする。 (A)平均粒径1〜12μmの範囲に設定されている非
導電性大径粒子。 (B)平均粒径0.1μm以上1μm未満の範囲に設定
されている非導電性小径粒子。In order to achieve the above object, the present invention provides a shaft having a rubber layer formed on the outer periphery thereof and a step of preparing a coating film forming solution, and a shaft having the rubber layer. Spirally applying the coating film forming solution to the outer peripheral surface of the rubber layer in a state where the rubber layer is substantially vertical, and drying the shaft body with the rubber layer coated with the coating film forming solution, Forming a coating film layer comprising the coating film forming solution on the outer peripheral surface of the layer, wherein the coating film forming solution comprises a matrix component for forming a coating film, the following components (A) and (B): The method for producing the conductive roll contained therein is referred to as a first subject, and the conductive roll obtained thereby is referred to as a second subject. (A) Non-conductive large-diameter particles whose average particle size is set in the range of 1 to 12 μm. (B) Non-conductive small-diameter particles having an average particle size of not less than 0.1 μm and less than 1 μm.
【0008】すなわち、本発明者らは、上記塗膜の厚み
むらの発生について一連の研究を重ねた。その結果、上
記塗膜の厚みむらの発生は、螺旋状塗布部形成後の液垂
れと密接な関係があることを突き止め、さらに研究を重
ねた。この研究の過程で、上記液垂れに際し、塗布に用
いる溶液中の粒子の粒径が大きく影響し、塗膜の粗面を
形成する特定粒径の大径粒子とそれよりも小径の粒子と
を組み合わせると、液垂れが円滑に行われ、その過程で
上記大径粒子の周りに小径粒子が配位して大径粒子の偏
在が防止されることとなるため、均一厚の塗膜が得られ
るようになることを見出し、本発明に到達した。That is, the present inventors have conducted a series of studies on the occurrence of unevenness in the thickness of the coating film. As a result, the inventors have found that the occurrence of the unevenness in the thickness of the coating film has a close relationship with the dripping after the formation of the spiral coating portion, and further studied. In the course of this research, during the dripping, the particle size of the particles in the solution used for coating greatly affected, and large particles having a specific particle size and particles having a smaller diameter than the specific particles forming the rough surface of the coating film were formed. When combined, the dripping is performed smoothly, and in the process, the small-sized particles are coordinated around the large-sized particles to prevent uneven distribution of the large-sized particles, so that a coating film having a uniform thickness is obtained. The inventors have found that the present invention has been made, and have reached the present invention.
【0009】[0009]
【発明の実施の形態】つぎに、本発明の実施の形態を説
明する。Next, an embodiment of the present invention will be described.
【0010】本発明に係る現像ロールは、例えば、図1
に示すように、芯金(軸体)1aの外周面にベースゴム
層1bが形成され、上記ベースゴム層1bの外周面に、
特定粒径の非導電性粒子とそれよりも小径の非導電性粒
子とを含み、膜厚が均一で表面が粗面になっている塗膜
層5が形成されて構成されている。The developing roll according to the present invention is, for example, shown in FIG.
As shown in the figure, a base rubber layer 1b is formed on the outer peripheral surface of a cored bar (shaft) 1a, and on the outer peripheral surface of the base rubber layer 1b,
A coating layer 5 having non-conductive particles having a specific particle size and non-conductive particles having a smaller diameter than the non-conductive particles and having a uniform thickness and a rough surface is formed.
【0011】上記芯金1aは特に制限するものではな
く、例えば、金属製の中実体からなる芯金や、内部を中
空にくり抜いた金属製の円筒体等が用いられる。そし
て、その材質としては、ステンレス、アルミニウム等が
あげられる。上記芯金1a上に、必要に応じて、接着
剤、プライマー等を塗布してもよく、また上記接着剤、
プライマー等は必要に応じて導電化してもよい。The core 1a is not particularly limited, and may be, for example, a metal core made of a solid metal, or a metal cylindrical body having the inside hollowed out. And, as its material, stainless steel, aluminum and the like can be mentioned. An adhesive, a primer, or the like may be applied on the cored bar 1a, if necessary.
The primer and the like may be made conductive as needed.
【0012】上記芯金1aの外周面に形成されるベース
ゴム層1bの形成材料としては、例えばエチレン−プロ
ピレン−ジエンゴム(EPDM)、スチレン−ブタジエ
ンゴム(SBR)、シリコーンゴム、ポリウレタン系エ
ラストマー等があげられる。この材料には、導電剤やシ
リコーンオイル等の各種の添加剤が適宜に配合される。
導電剤としては、カーボンブラック、グラファイト、チ
タン酸カリウム、酸化鉄、c−TiO2 、c−ZnO、
c−SnO2 (ここで「c−」は導電性を有するという
意味)等の各種のものがあげられる。また、シリコーン
オイルとしては、ジメチルシリコーンオイル等の各種の
ものがあげられる。なかでも、上記ベースゴム層1bの
形成材料としては、低硬度でへたりが少ないという点か
ら、導電性シリコーンゴムを用いることが好ましい。As a material for forming the base rubber layer 1b formed on the outer peripheral surface of the cored bar 1a, for example, ethylene-propylene-diene rubber (EPDM), styrene-butadiene rubber (SBR), silicone rubber, polyurethane elastomer and the like are used. can give. Various additives such as a conductive agent and silicone oil are appropriately mixed with this material.
As the conductive agent, carbon black, graphite, potassium titanate, iron oxide, c-TiO 2 , c-ZnO,
Various types such as c-SnO 2 (here, “c-” means having conductivity) are exemplified. Examples of the silicone oil include various oils such as dimethyl silicone oil. Above all, it is preferable to use a conductive silicone rubber as a material for forming the base rubber layer 1b from the viewpoint of low hardness and low set.
【0013】上記ベースゴム層1b(図1)の外周面に
形成される塗膜層5の形成材料としては、マトリックス
成分と、平均粒径が特定の範囲に設定されている非導電
性大径粒子と、非導電性小径粒子とがあげられる。As a material for forming the coating layer 5 formed on the outer peripheral surface of the base rubber layer 1b (FIG. 1), a matrix component and a non-conductive large particle having an average particle diameter set in a specific range are used. Particles and non-conductive small diameter particles.
【0014】上記マトリックス成分材料としては、特に
限定はなく、例えば、ウレタン樹脂、ポリアミド樹脂等
の樹脂材料やゴム材料があげられ、これらは単独でもし
くは2種以上併せて用いられる。なかでも、耐摩耗性の
点で、ウレタン樹脂が好適に用いられる。The matrix component material is not particularly limited and includes, for example, resin materials such as urethane resins and polyamide resins and rubber materials, and these may be used alone or in combination of two or more. Among them, urethane resin is preferably used in terms of abrasion resistance.
【0015】上記非導電性大径粒子および非導電性小径
粒子としては、シリカ、ウレタン粉末、ポリアミド粉
末、フッ素樹脂粉末等があげられる。これらは、単独で
用いてもよいし、2種以上併用してもよい。なかでも、
トナーを高帯電化させる等のできるシリカが好適に用い
られる。The non-conductive large-diameter particles and the non-conductive small-diameter particles include silica, urethane powder, polyamide powder, fluororesin powder and the like. These may be used alone or in combination of two or more. Above all,
Silica that can make the toner highly charged is preferably used.
【0016】上記非導電性大径粒子は、主として塗膜層
の表面を粗面にする目的で用いられるものであり、その
平均粒径は、1〜12μmの範囲に設定される。より好
ましくは、4〜6μmの範囲である。また、非導電性小
径粒子は、上記大径粒子の周りを埋め大径粒子の偏在を
防ぐ作用をすると考えられるもので、その平均粒径が
0.1μm以上1μm未満の範囲に設定される。より好
ましくは、0.2〜0.4μmの範囲である。すなわ
ち、上記大径粒子と小径粒子の粒径が上記の範囲を外れ
ると、螺旋状塗布部の液垂れが円滑に行われず、得られ
る塗膜層の膜厚が均一にならず凹凸を生じ、それによっ
て塗膜層表面の粗面も均一にならなくなるからである。
なお、上記大径および小径粒子の形状としては球状が好
ましいが、楕円状であっても差し支えない。また、上記
両径粒子の形状が球状ではなく、楕円状や偏平状等のよ
うに一律に粒径が定まらない場合には、母集団から任意
にとりだした試料について、各粒子の最長径と最短径の
単純平均値を平均粒径とする。The non-conductive large-diameter particles are mainly used for the purpose of roughening the surface of the coating layer, and the average particle size is set in the range of 1 to 12 μm. More preferably, it is in the range of 4 to 6 μm. Further, the non-conductive small-diameter particles are considered to have a function of burying the periphery of the large-diameter particles and preventing uneven distribution of the large-diameter particles, and the average particle diameter is set in a range of 0.1 μm or more and less than 1 μm. More preferably, it is in the range of 0.2 to 0.4 μm. That is, when the diameters of the large-diameter particles and the small-diameter particles deviate from the above range, the dripping of the spiral coating portion is not performed smoothly, and the resulting coating layer does not have a uniform film thickness and unevenness occurs. As a result, the rough surface of the coating film layer becomes non-uniform.
The large and small particles are preferably spherical, but may be elliptical. In addition, when the shape of the above both-diameter particles is not spherical, but the particle size is not uniformly determined such as elliptical or flat, for a sample arbitrarily taken from the population, the longest diameter and the shortest The simple average value of the diameter is defined as the average particle diameter.
【0017】上記非導電性大径粒子の配合割合は、上記
マトリックス成分100重量部(以下「部」と略す)に
対して5〜20部の範囲に設定することが好ましい。よ
り好ましくは8〜15部の範囲である。この範囲を外れ
ると、所望の表面粗さの塗膜層が得られなくなる傾向が
みられるからである。また、非導電性小径粒子の配合割
合は、上記マトリックス成分100部に対して5〜15
0部の範囲に設定されていることが好ましい。より好ま
しくは20〜80部の範囲である。すなわち、上記両径
粒子の配合割合が上記の範囲を外れると、螺旋状塗布部
の液垂れが非円滑的になるとともに大径粒子の周りに配
位する小径粒子の量が過不足になり、均一な塗膜厚およ
び粗面の塗膜層が得られにくくなる傾向がみられるから
である。The mixing ratio of the non-conductive large-diameter particles is preferably set in the range of 5 to 20 parts with respect to 100 parts by weight (hereinafter abbreviated as "part") of the matrix component. It is more preferably in the range of 8 to 15 parts. If the ratio is out of this range, it tends to be difficult to obtain a coating layer having a desired surface roughness. The mixing ratio of the non-conductive small-diameter particles is 5 to 15 parts per 100 parts of the matrix component.
Preferably, it is set in the range of 0 parts. It is more preferably in the range of 20 to 80 parts. That is, when the mixing ratio of the both-diameter particles deviates from the above range, the amount of the small-diameter particles coordinated around the large-diameter particles while the dripping of the spiral coating portion becomes non-smooth becomes excessive or insufficient, This is because it tends to be difficult to obtain a coating layer having a uniform coating thickness and a rough surface.
【0018】そして、上記の塗膜層形成材料は、有機溶
媒と共に混合され、塗膜形成用溶液(通常、懸濁液)と
して使用に供される。上記有機溶媒としては、メチルエ
チルケトン(MEK)、メタノール、トルエン、イソプ
ロピルアルコール、メチルセロソルブ、ジメチルホルム
アミド等があげられる。これらは単独でもしくは2種以
上併せて用いられる。特にメチルエチルケトンを用いる
ことがマトリックス成分の溶解性の点で好ましく、この
ような塗膜形成用溶液は粘度を0.05〜0.06Pa
・sにすることが、塗工性等の点で好ましい。The material for forming a coating layer is mixed with an organic solvent and used as a coating solution (usually a suspension). Examples of the organic solvent include methyl ethyl ketone (MEK), methanol, toluene, isopropyl alcohol, methyl cellosolve, dimethylformamide and the like. These may be used alone or in combination of two or more. Particularly, it is preferable to use methyl ethyl ketone from the viewpoint of the solubility of the matrix component. Such a coating film forming solution has a viscosity of 0.05 to 0.06 Pa.
S is preferred in terms of coatability and the like.
【0019】上記図1に示した本発明に係る導電ロール
は、例えば、つぎのようにして製造することができる。
すなわち、まず、上記ベースゴム層1b形成材料用の各
成分をニーダー等の混練機で混練し、ベースゴム層1b
形成材料を作製する。ついで、円筒状金型の中空部に、
金属製芯金1aをセットし、上記円筒状金型と芯金1a
との空隙部に、上記ベースゴム層1b形成材料を注型し
た後、金型を蓋し、加熱して、ベースゴム層1b形成材
料を架橋させる。その後、上記円筒状金型から脱型する
ことにより、芯金1aの外周面にベースゴム層1bが形
成されてなるベースロールを製造する。The conductive roll according to the present invention shown in FIG. 1 can be manufactured, for example, as follows.
That is, first, the respective components for the material for forming the base rubber layer 1b are kneaded with a kneader such as a kneader, and the base rubber layer 1b is kneaded.
A forming material is prepared. Then, in the hollow part of the cylindrical mold,
A metal core 1a is set, and the cylindrical mold and the core 1a are set.
After the material for forming the base rubber layer 1b is cast into the gap between the above, the mold is covered and heated to crosslink the material for forming the base rubber layer 1b. Thereafter, by removing the mold from the cylindrical mold, a base roll having the base rubber layer 1b formed on the outer peripheral surface of the cored bar 1a is manufactured.
【0020】他方、上記塗膜層形成用の各材料を準備
し、これらを、ボールミル,ロール等の混練機を用いて
混練し、この混合物に有機溶剤を加えて混合、攪拌する
ことにより、塗膜形成用溶液を作製する。On the other hand, the above-mentioned materials for forming the coating layer are prepared, kneaded with a kneader such as a ball mill or a roll, and an organic solvent is added to the mixture, followed by mixing and stirring. A solution for forming a film is prepared.
【0021】そして、図2に示すように、ベースロール
1を軸体中心に円周方向に回転させながら、その外周面
に、軸中心に回転するペイントロール25を接しさせ、
その状態でペイントロール25を矢印のように下方に移
動させ、ベースロール1の外周面に螺旋状に塗膜形成溶
液を塗布する。Then, as shown in FIG. 2, while rotating the base roll 1 in the circumferential direction around the shaft body, a paint roll 25 rotating around the shaft is brought into contact with the outer peripheral surface thereof.
In this state, the paint roll 25 is moved downward as shown by the arrow, and the coating film forming solution is spirally applied to the outer peripheral surface of the base roll 1.
【0022】上記図2の塗布装置を図3でより詳しく説
明する。図3において、10は基台9に立設された保持
プレート、11は溝付きガイドレール、12はスライド
体、13はガイドレール11の溝に沿って移動する左右
一対の嵌合凸部、14はスライド体12から延びる突出
片、14aはそこに設けられた雌ねじ穴、15はそれら
に螺合する雄ねじ軸、17は保持プレート10の支持体
16に設けられ雄ねじ軸15を駆動する変速モータ、1
9はスライド体12に設けられたモータ、19aはその
モータ19の回転軸であり、ベースロール1の芯金の上
端部に連結する構造になっている。18はセンターピン
で、その先端部でベースロール1の芯金の下端部を回転
自在に支持する。18aはセンターピンを上下にスライ
ドさせベースロール1を着脱するねじである。これらに
よりベースロール1が周方向に回転しながら上下(軸方
向)に移動するようになっている。21は塗膜形成用溶
液タンク、22はモータでペイントロール25を回転駆
動する。23は支持台、24は支持脚である。この装置
は先に述べたように、ベースロール1を周方向に回転さ
せながら、その外周面にペイントロール25を接しさ
せ、その状態でペイントロール25を下方に移動させて
その外周面に螺旋状に塗膜形成用溶液を塗布する。The coating apparatus of FIG. 2 will be described in more detail with reference to FIG. 3, reference numeral 10 denotes a holding plate erected on the base 9, reference numeral 11 denotes a grooved guide rail, reference numeral 12 denotes a slide body, reference numeral 13 denotes a pair of right and left fitting protrusions which move along the groove of the guide rail 11, reference numeral 14 denotes Is a projecting piece extending from the slide body 12, 14a is a female screw hole provided therein, 15 is a male screw shaft screwed to them, 17 is a speed change motor provided on the support 16 of the holding plate 10 and driving the male screw shaft 15, 1
Reference numeral 9 denotes a motor provided on the slide body 12, and reference numeral 19 a denotes a rotation shaft of the motor 19, which is connected to an upper end portion of the core of the base roll 1. A center pin 18 rotatably supports the lower end of the core of the base roll 1 at its tip. 18a is a screw for sliding the center pin up and down to attach and detach the base roll 1. Thus, the base roll 1 moves vertically (axially) while rotating in the circumferential direction. Reference numeral 21 denotes a coating film forming solution tank, and reference numeral 22 drives a paint roll 25 by a motor. 23 is a support stand, and 24 is a support leg. As described above, this apparatus brings the paint roll 25 into contact with the outer peripheral surface of the base roll 1 while rotating the base roll 1 in the circumferential direction. Is applied with a coating film forming solution.
【0023】この螺旋状塗布部を図4(a)に示す。図
において、1はベースロール(図では、その要部を拡大
している)、2は螺旋状塗布部、3はベースロール1の
地肌部(塗膜形成用溶液の塗布されていないベースゴム
層の表面部分)、4は小径粒子、6は大径粒子である。
そして、この状態で暫く放置すると、螺旋状塗布部の溶
液が液垂れし、図4(b)のように地肌部3を被覆し全
体に均一な状態となる。そして、この状態で上記塗布装
置から外し乾燥することにより、目的とする塗膜層5が
形成される。この場合、上記液垂れにより、大径粒子6
の周囲に小径粒子4が配位し大径粒子6の偏在を防ぐこ
とから、塗膜層5全体が均質になり、表面の粗さも均一
になる。このようにして得られた導電ロールの塗膜層5
の体積抵抗率は、1.0×108 〜1.0×1014Ω・
cmの範囲に設定されていることが好ましい。FIG. 4A shows the spiral coating portion. In the figure, 1 is a base roll (the main part is enlarged in the figure), 2 is a spiral coating portion, 3 is a background portion of the base roll 1 (a base rubber layer on which a coating film forming solution is not applied). 4) are small-diameter particles and 6 are large-diameter particles.
Then, if left in this state for a while, the solution in the spiral application portion drips and covers the background portion 3 as shown in FIG. Then, in this state, the target coating film layer 5 is formed by removing from the coating device and drying. In this case, the large particles 6
, The small-sized particles 4 are coordinated to prevent uneven distribution of the large-sized particles 6, so that the entire coating layer 5 is uniform and the surface roughness is also uniform. The coating layer 5 of the conductive roll thus obtained
Has a volume resistivity of 1.0 × 10 8 to 1.0 × 10 14 Ω ·
cm.
【0024】そして、上記導電ロールにおいて、上記両
径の粒子はいずれも非導電性粒子であるため、得られる
塗膜層5は、高抵抗層となる。そのため、上記塗布層が
形成された現像ロール等の導電ロールの耐圧性は上が
る。したがって、上記ロールを電子写真複写機に組み込
んで使用すると、上記塗膜層5との作用と相まってトナ
ー搬送量にむらがなくなり、均一な濃度の画像を得るこ
とができる。In the conductive roll, since the particles having both diameters are non-conductive particles, the coating layer 5 obtained is a high resistance layer. Therefore, the pressure resistance of a conductive roll such as a developing roll on which the coating layer is formed increases. Therefore, when the roll is incorporated in an electrophotographic copying machine and used together with the action of the coating layer 5, there is no unevenness in the amount of toner transported, and an image having a uniform density can be obtained.
【0025】つぎに、この発明を現像ロールに応用した
実施例について比較例と併せて説明する。Next, examples in which the present invention is applied to a developing roll will be described together with comparative examples.
【0026】[0026]
【実施例1】〔ベースロールの作製〕まず、芯金として
アルミニウム製芯金を準備し、上記芯金の外周面に接着
剤を塗布した。ついで、円筒状金型の中空部に、上記芯
金をセットし、円筒状金型と芯金との空隙部に、シリコ
ーンゴムコンパウンドを注型した後、金型に蓋をし、こ
れを加熱(180℃×15分)して、シリコーンゴムコ
ンパウンドを加硫し、その後脱型して、ベースゴム層付
き芯金(ベースロール)を作製した。Example 1 [Production of Base Roll] First, an aluminum core was prepared as a core, and an adhesive was applied to the outer peripheral surface of the core. Next, the above-mentioned core metal was set in the hollow part of the cylindrical mold, and after the silicone rubber compound was cast in the gap between the cylindrical mold and the core metal, the mold was covered and heated. (180 ° C. × 15 minutes), the silicone rubber compound was vulcanized, and then demolded to produce a core metal (base roll) with a base rubber layer.
【0027】〔塗膜形成用溶液の作製〕つぎに、市販の
ウレタン樹脂100部と、市販の平均粒径1.5μmの
シリカ10部と、平均粒径0.3μmのシリカ5部と
を、混練機(ロール)を用いて混練し、この混合物にM
EK200部を加えて混合、攪拌することにより、塗膜
形成用溶液を作製した。上記溶液の粘度は、0.05P
a・sに調製された。[Preparation of Coating Solution] Next, 100 parts of a commercially available urethane resin, 10 parts of a commercially available silica having an average particle diameter of 1.5 μm, and 5 parts of a silica having an average particle diameter of 0.3 μm were mixed with each other. The mixture is kneaded using a kneader (roll).
200 parts of EK was added, mixed and stirred to prepare a coating film forming solution. The viscosity of the above solution is 0.05P
as prepared.
【0028】〔現像ロールの作製〕上記ベースロールを
図3に示す装置に掛けて、ベースゴム層の外周面に、塗
膜形成用溶液を螺旋状に塗布した後、乾燥および加熱処
理を行ない、ベースゴム層の外周面に塗膜層を形成し
た。このようにして、芯金の外周面にベースゴム層が形
成され、さらにその外周面に塗膜層が形成されてなる現
像ロールを作製した。[Preparation of Developing Roll] The above-mentioned base roll is set on the apparatus shown in FIG. 3, and a coating film forming solution is spirally applied to the outer peripheral surface of the base rubber layer, followed by drying and heat treatment. A coating layer was formed on the outer peripheral surface of the base rubber layer. In this manner, a developing roll having a base rubber layer formed on the outer peripheral surface of the cored bar and a coating film layer formed on the outer peripheral surface was produced.
【0029】[0029]
【実施例2】平均粒径0.3μmのシリカの配合割合を
20部とする以外は実施例1と同様にして、塗膜形成用
溶液を作製した。そして、実施例1と同様にして、現像
ロールを作製した。Example 2 A coating film forming solution was prepared in the same manner as in Example 1 except that the mixing ratio of silica having an average particle diameter of 0.3 μm was changed to 20 parts. Then, a developing roll was produced in the same manner as in Example 1.
【0030】[0030]
【実施例3】平均粒径0.3μmのシリカの配合割合を
50部とする以外は実施例1と同様にして、塗膜形成用
溶液を作製した。そして、実施例1と同様にして、現像
ロールを作製した。Example 3 A coating film forming solution was prepared in the same manner as in Example 1 except that the mixing ratio of silica having an average particle diameter of 0.3 μm was changed to 50 parts. Then, a developing roll was produced in the same manner as in Example 1.
【0031】[0031]
【実施例4】平均粒径0.3μmのシリカの配合割合を
80部とする以外は実施例1と同様にして、塗膜形成用
溶液を作製した。そして、実施例1と同様にして、現像
ロールを作製した。Example 4 A coating film forming solution was prepared in the same manner as in Example 1 except that the mixing ratio of silica having an average particle diameter of 0.3 μm was changed to 80 parts. Then, a developing roll was produced in the same manner as in Example 1.
【0032】[0032]
【実施例5】平均粒径0.3μmのシリカの配合割合を
100部とする以外は実施例1と同様にして、塗膜形成
用溶液を作製した。そして、実施例1と同様にして、現
像ロールを作製した。Example 5 A coating film forming solution was prepared in the same manner as in Example 1 except that the mixing ratio of silica having an average particle diameter of 0.3 μm was changed to 100 parts. Then, a developing roll was produced in the same manner as in Example 1.
【0033】[0033]
【実施例6】平均粒径0.3μmのシリカに代えて、平
均粒径0.8μmのシリカ20部を配合する以外は実施
例1と同様にして、塗膜形成用溶液を作製した。そし
て、実施例1と同様にして、現像ロールを作製した。Example 6 A coating film forming solution was prepared in the same manner as in Example 1 except that 20 parts of silica having an average particle diameter of 0.8 μm was used instead of silica having an average particle diameter of 0.3 μm. Then, a developing roll was produced in the same manner as in Example 1.
【0034】[0034]
【実施例7】平均粒径0.3μmのシリカに代えて、平
均粒径0.8μmのシリカ50部を配合する以外は実施
例1と同様にして、塗膜形成用溶液を作製した。そし
て、実施例1と同様にして、現像ロールを作製した。Example 7 A coating solution was prepared in the same manner as in Example 1 except that 50 parts of silica having an average particle size of 0.8 μm was used instead of silica having an average particle size of 0.3 μm. Then, a developing roll was produced in the same manner as in Example 1.
【0035】[0035]
【実施例8】平均粒径0.3μmのシリカに代えて、平
均粒径0.8μmのシリカ80部を配合する以外は実施
例1と同様にして、塗膜形成用溶液を作製した。そし
て、実施例1と同様にして、現像ロールを作製した。Example 8 A coating film forming solution was prepared in the same manner as in Example 1 except that 80 parts of silica having an average particle size of 0.8 μm was used instead of silica having an average particle size of 0.3 μm. Then, a developing roll was produced in the same manner as in Example 1.
【0036】[0036]
【実施例9】平均粒径1.5μmのシリカに代えて、平
均粒径5μmのシリカ10部を配合する以外は実施例1
と同様にして、塗膜形成用溶液を作製した。そして、実
施例1と同様にして、現像ロールを作製した。Example 9 Example 1 was repeated except that 10 parts of silica having an average particle size of 5 μm was used instead of silica having an average particle size of 1.5 μm.
In the same manner as in the above, a coating film forming solution was prepared. Then, a developing roll was produced in the same manner as in Example 1.
【0037】[0037]
【実施例10】平均粒径1.5μmのシリカに代えて、
平均粒径5μmのシリカ10部を配合し、かつ、平均粒
径0.3μmのシリカの配合割合を20部とする以外は
実施例1と同様にして、塗膜形成用溶液を作製した。そ
して、実施例1と同様にして、現像ロールを作製した。Example 10 Instead of silica having an average particle size of 1.5 μm,
A coating film forming solution was prepared in the same manner as in Example 1 except that 10 parts of silica having an average particle diameter of 5 μm was mixed and the mixing ratio of silica having an average particle diameter of 0.3 μm was changed to 20 parts. Then, a developing roll was produced in the same manner as in Example 1.
【0038】[0038]
【実施例11】平均粒径1.5μmのシリカに代えて、
平均粒径5μmのシリカ10部を配合し、かつ、平均粒
径0.3μmのシリカの配合割合を50部とする以外は
実施例1と同様にして、塗膜形成用溶液を作製した。そ
して、実施例1と同様にして、現像ロールを作製した。Example 11 Instead of silica having an average particle size of 1.5 μm,
A coating film forming solution was prepared in the same manner as in Example 1 except that 10 parts of silica having an average particle diameter of 5 μm was mixed and the mixing ratio of silica having an average particle diameter of 0.3 μm was changed to 50 parts. Then, a developing roll was produced in the same manner as in Example 1.
【0039】[0039]
【実施例12】平均粒径1.5μmのシリカに代えて、
平均粒径5μmのシリカ10部を配合し、かつ、平均粒
径0.3μmのシリカの配合割合を80部とする以外は
実施例1と同様にして、塗膜形成用溶液を作製した。そ
して、実施例1と同様にして、現像ロールを作製した。Example 12 Instead of silica having an average particle size of 1.5 μm,
A coating film forming solution was prepared in the same manner as in Example 1 except that 10 parts of silica having an average particle diameter of 5 μm was mixed and the mixing ratio of silica having an average particle diameter of 0.3 μm was changed to 80 parts. Then, a developing roll was produced in the same manner as in Example 1.
【0040】[0040]
【実施例13】平均粒径1.5μmのシリカに代えて、
平均粒径5μmのシリカ10部を配合し、かつ、平均粒
径0.3μmのシリカの配合割合を100部とする以外
は実施例1と同様にして、塗膜形成用溶液を作製した。
そして、実施例1と同様にして、現像ロールを作製し
た。Example 13 Instead of silica having an average particle size of 1.5 μm,
A coating film forming solution was prepared in the same manner as in Example 1 except that 10 parts of silica having an average particle diameter of 5 μm was mixed and the mixing ratio of silica having an average particle diameter of 0.3 μm was changed to 100 parts.
Then, a developing roll was produced in the same manner as in Example 1.
【0041】[0041]
【実施例14】平均粒径1.5μmのシリカに代えて、
平均粒径5μmのシリカ10部を配合し、かつ、平均粒
径0.3μmのシリカに代えて、平均粒径0.8μmの
シリカ20部を配合する以外は実施例1と同様にして、
塗膜形成用溶液を作製した。そして、実施例1と同様に
して、現像ロールを作製した。Example 14 Instead of silica having an average particle size of 1.5 μm,
In the same manner as in Example 1 except that 10 parts of silica having an average particle diameter of 5 μm was blended, and instead of silica having an average particle diameter of 0.3 μm, 20 parts of silica having an average particle diameter of 0.8 μm was blended,
A solution for forming a coating film was prepared. Then, a developing roll was produced in the same manner as in Example 1.
【0042】[0042]
【実施例15】平均粒径1.5μmのシリカに代えて、
平均粒径5μmのシリカ10部を配合し、かつ、平均粒
径0.3μmのシリカに代えて、平均粒径0.8μmの
シリカ50部を配合する以外は実施例1と同様にして、
塗膜形成用溶液を作製した。そして、実施例1と同様に
して、現像ロールを作製した。Example 15 Instead of silica having an average particle size of 1.5 μm,
In the same manner as in Example 1 except that 10 parts of silica having an average particle diameter of 5 μm was blended, and instead of silica having an average particle diameter of 0.3 μm, 50 parts of silica having an average particle diameter of 0.8 μm was blended,
A solution for forming a coating film was prepared. Then, a developing roll was produced in the same manner as in Example 1.
【0043】[0043]
【実施例16】平均粒径1.5μmのシリカに代えて、
平均粒径5μmのシリカ10部を配合し、かつ、平均粒
径0.3μmのシリカに代えて、平均粒径0.8μmの
シリカ80部を配合する以外は実施例1と同様にして、
塗膜形成用溶液を作製した。そして、実施例1と同様に
して、現像ロールを作製した。Example 16 Instead of silica having an average particle size of 1.5 μm,
In the same manner as in Example 1 except that 10 parts of silica having an average particle diameter of 5 μm was blended, and instead of silica having an average particle diameter of 0.3 μm, 80 parts of silica having an average particle diameter of 0.8 μm was blended,
A solution for forming a coating film was prepared. Then, a developing roll was produced in the same manner as in Example 1.
【0044】[0044]
【実施例17】平均粒径1.5μmのシリカに代えて、
平均粒径11μmのシリカ10部を配合する以外は実施
例1と同様にして、塗膜形成用溶液を作製した。そし
て、実施例1と同様にして、現像ロールを作製した。Example 17 Instead of silica having an average particle size of 1.5 μm,
A coating film forming solution was prepared in the same manner as in Example 1 except that 10 parts of silica having an average particle size of 11 μm was blended. Then, a developing roll was produced in the same manner as in Example 1.
【0045】[0045]
【実施例18】平均粒径1.5μmのシリカに代えて、
平均粒径11μmのシリカ10部を配合し、かつ、平均
粒径0.3μmのシリカの配合割合を20部とする以外
は実施例1と同様にして、塗膜形成用溶液を作製した。
そして、実施例1と同様にして、現像ロールを作製し
た。Example 18 Instead of silica having an average particle size of 1.5 μm,
A coating film forming solution was prepared in the same manner as in Example 1, except that 10 parts of silica having an average particle diameter of 11 μm was mixed and the mixing ratio of silica having an average particle diameter of 0.3 μm was changed to 20 parts.
Then, a developing roll was produced in the same manner as in Example 1.
【0046】[0046]
【実施例19】平均粒径1.5μmのシリカに代えて、
平均粒径11μmのシリカ10部を配合し、かつ、平均
粒径0.3μmのシリカの配合割合を50部とする以外
は実施例1と同様にして、塗膜形成用溶液を作製した。
そして、実施例1と同様にして、現像ロールを作製し
た。Example 19 Instead of silica having an average particle size of 1.5 μm,
A coating film forming solution was prepared in the same manner as in Example 1 except that 10 parts of silica having an average particle diameter of 11 μm was mixed and the mixing ratio of silica having an average particle diameter of 0.3 μm was changed to 50 parts.
Then, a developing roll was produced in the same manner as in Example 1.
【0047】[0047]
【実施例20】平均粒径1.5μmのシリカに代えて、
平均粒径11μmのシリカ10部を配合し、かつ、平均
粒径0.3μmのシリカの配合割合を80部とする以外
は実施例1と同様にして、塗膜形成用溶液を作製した。
そして、実施例1と同様にして、現像ロールを作製し
た。Example 20 Instead of silica having an average particle size of 1.5 μm,
A coating film forming solution was prepared in the same manner as in Example 1 except that 10 parts of silica having an average particle diameter of 11 μm was mixed and the mixing ratio of silica having an average particle diameter of 0.3 μm was changed to 80 parts.
Then, a developing roll was produced in the same manner as in Example 1.
【0048】[0048]
【実施例21】平均粒径1.5μmのシリカに代えて、
平均粒径11μmのシリカ10部を配合し、かつ、平均
粒径0.3μmのシリカの配合割合を100部とする以
外は実施例1と同様にして、塗膜形成用溶液を作製し
た。そして、実施例1と同様にして、現像ロールを作製
した。Example 21 Instead of silica having an average particle size of 1.5 μm,
A coating film forming solution was prepared in the same manner as in Example 1 except that 10 parts of silica having an average particle diameter of 11 μm was mixed and the mixing ratio of silica having an average particle diameter of 0.3 μm was changed to 100 parts. Then, a developing roll was produced in the same manner as in Example 1.
【0049】[0049]
【実施例22】平均粒径1.5μmのシリカに代えて、
平均粒径11μmのシリカ10部を配合し、かつ、平均
粒径0.3μmのシリカに代えて、平均粒径0.8μm
のシリカ20部を配合する以外は実施例1と同様にし
て、塗膜形成用溶液を作製した。そして、実施例1と同
様にして、現像ロールを作製した。Example 22 Instead of silica having an average particle size of 1.5 μm,
10 parts of silica having an average particle diameter of 11 μm is blended, and instead of silica having an average particle diameter of 0.3 μm, an average particle diameter of 0.8 μm is used.
A coating film forming solution was prepared in the same manner as in Example 1 except that 20 parts of silica was blended. Then, a developing roll was produced in the same manner as in Example 1.
【0050】[0050]
【実施例23】平均粒径1.5μmのシリカに代えて、
平均粒径11μmのシリカ10部を配合し、かつ、平均
粒径0.3μmのシリカに代えて、平均粒径0.8μm
のシリカ50部を配合する以外は実施例1と同様にし
て、塗膜形成用溶液を作製した。そして、実施例1と同
様にして、現像ロールを作製した。Example 23 Instead of silica having an average particle size of 1.5 μm,
10 parts of silica having an average particle diameter of 11 μm is blended, and instead of silica having an average particle diameter of 0.3 μm, an average particle diameter of 0.8 μm is used.
A solution for forming a coating film was prepared in the same manner as in Example 1 except that 50 parts of silica was blended. Then, a developing roll was produced in the same manner as in Example 1.
【0051】[0051]
【実施例24】平均粒径1.5μmのシリカに代えて、
平均粒径11μmのシリカ10部を配合し、かつ、平均
粒径0.3μmのシリカに代えて、平均粒径0.8μm
のシリカ80部を配合する以外は実施例1と同様にし
て、塗膜形成用溶液を作製した。そして、実施例1と同
様にして、現像ロールを作製した。Example 24 Instead of silica having an average particle size of 1.5 μm,
10 parts of silica having an average particle diameter of 11 μm is blended, and instead of silica having an average particle diameter of 0.3 μm, an average particle diameter of 0.8 μm is used.
A coating film forming solution was prepared in the same manner as in Example 1 except that 80 parts of silica was blended. Then, a developing roll was produced in the same manner as in Example 1.
【0052】[0052]
【比較例1】平均粒径0.3μmのシリカを配合しない
以外は実施例1と同様にして、塗膜形成用溶液を作製し
た。そして、実施例1と同様にして、現像ロールを作製
した。Comparative Example 1 A coating film forming solution was prepared in the same manner as in Example 1 except that silica having an average particle diameter of 0.3 μm was not blended. Then, a developing roll was produced in the same manner as in Example 1.
【0053】[0053]
【比較例2】平均粒径1.5μmのシリカに代えて、平
均粒径5μmのシリカ10部を配合し、かつ、平均粒径
0.3μmのシリカを配合しない以外は実施例1と同様
にして、塗膜形成用溶液を作製した。そして、実施例1
と同様にして、現像ロールを作製した。Comparative Example 2 In the same manner as in Example 1 except that 10 parts of silica having an average particle diameter of 5 μm was blended instead of silica having an average particle diameter of 1.5 μm, and silica having an average particle diameter of 0.3 μm was not blended. Thus, a coating film forming solution was prepared. And Example 1
A developing roll was produced in the same manner as described above.
【0054】[0054]
【比較例3】平均粒径1.5μmのシリカに代えて、平
均粒径11μmのシリカ10部を配合し、かつ、平均粒
径0.3μmのシリカを配合しない以外は実施例1と同
様にして、塗膜形成用溶液を作製した。そして、実施例
1と同様にして、現像ロールを作製した。Comparative Example 3 In the same manner as in Example 1 except that 10 parts of silica having an average particle size of 11 μm was blended in place of silica having an average particle size of 1.5 μm, and silica having an average particle size of 0.3 μm was not blended. Thus, a coating film forming solution was prepared. Then, a developing roll was produced in the same manner as in Example 1.
【0055】このようにして得られた各現像ロールにつ
いて、下記の基準に従い、表面粗さ(Rz)、粗さの
差、軸方向うねりについて比較評価を行い、その結果
を、下記の表1〜表4に示した。For each of the developing rolls thus obtained, the surface roughness (Rz), the difference in roughness, and the waviness in the axial direction were compared and evaluated according to the following criteria. The results are shown in Table 4.
【0056】〔表面粗さ(Rz)〕現像ロール表面の表
面粗さ(周方向)を、サーフコム(東京精密社製)に
て、JIS B 0601に準拠して測定した。Rz
は、凸凹に直角な平面で切断したとき、その切り口に現
れる輪郭(これを断面曲線という)から、所定の波長よ
り長い表面うねり成分をカットオフした粗さ曲線より求
められる十点平均粗さであることを示す。なお、「密
部」および「疎部」とは、大径シリカの分散状態を示
す。[Surface Roughness (Rz)] The surface roughness (circumferential direction) of the developing roll surface was measured by Surfcom (Tokyo Seimitsu Co., Ltd.) in accordance with JIS B0601. Rz
Is a ten-point average roughness obtained from a roughness curve obtained by cutting off a surface undulation component longer than a predetermined wavelength from a contour (which is referred to as a cross-sectional curve) that appears at the cut when cut along a plane perpendicular to the unevenness. Indicates that there is. In addition, "dense part" and "sparse part" show the dispersion state of large-diameter silica.
【0057】〔粗さの差〕上記密部の表面粗さ(Rz)
から疎部の表面粗さ(Rz)を引いて算出した。[Difference in roughness] Surface roughness (Rz) of the dense portion
Was calculated by subtracting the surface roughness (Rz) of the sparse part from.
【0058】〔軸方向うねり〕軸方向における、現像ロ
ール表面の凸部から凹部までの高低差(うねり)を測定
した。[Axial Waviness] The difference in height (undulation) from the convex portion to the concave portion of the developing roll surface in the axial direction was measured.
【0059】[0059]
【表1】 [Table 1]
【0060】[0060]
【表2】 [Table 2]
【0061】[0061]
【表3】 [Table 3]
【0062】[0062]
【表4】 [Table 4]
【0063】上記表1〜表4の結果から、実施例品の現
像ロールは、軸方向うねりが小さく塗膜の膜厚が均一で
あり、また、表面粗さも、密部と粗部との差が小さく、
塗膜層表面の粗面度も均質であることがわかる。これに
対して大径シリカのみで、小径シリカとの併用をしてい
ない比較例品は、上記各項目について実施例品よりも劣
っている。From the results shown in Tables 1 to 4, the developing roll of the product of Example has a small waviness in the axial direction and a uniform thickness of the coating film, and the surface roughness shows the difference between the dense portion and the rough portion. Is small,
It can be seen that the roughness of the coating layer surface is also uniform. On the other hand, the comparative product, which is composed only of the large-diameter silica and not used in combination with the small-diameter silica, is inferior to the product of the example in each of the above items.
【0064】[0064]
【発明の効果】以上のように、本発明の導電ロールの製
法は、粗さ形成粒子として平均粒径が特定の範囲に設定
されている非導電性大径粒子(A成分)とこれよりも小
径の非導電性小径粒子(B成分)とを併用して塗膜形成
用溶液をつくり、これを、略垂直状態にした軸体外周面
に螺旋状に塗布乾燥して塗膜層を形成する。そのため、
ベースゴム層の外周面において螺旋状の塗膜形成用溶液
塗布部から塗布液の一部がその下側の地肌の部分(上記
溶液の塗布されていないベースゴム層の表面部分)に対
して円滑に液垂れして地肌上にも上記溶液が上記塗布部
と同様に塗布されることとなる。そのため、得られる塗
膜層の厚みが均一的になる。また、上記液垂れの際、大
径粒子の周りに小径粒子が配位して大径粒子の偏在が防
がれ、大径粒子の偏在にもとづく凹凸や塗膜層表面の粗
度のばらつきが防止され、塗膜層表面に均一な粗面が形
成されるようになる。そして、このようにして得られた
導電ロールは、塗膜層が均一状で粗面も均一状であるこ
とから、きわめて優れた特性を備えている。そのうえ、
上記(A)成分および(B)成分は非導電性粒子である
ため、得られる塗膜層は、高抵抗層となる。その結果、
上記塗膜層が形成された導電ロールの耐圧性は上がり、
それを、例えば現像ロールとして電子写真複写機に組み
込んで使用すると、上記塗膜層の優れた特性と相まっ
て、トナー搬送量にむらがなくなり、均一な濃度の画像
を得られるといった効果を奏するようになる。As described above, the method for producing the conductive roll of the present invention is characterized in that the non-conductive large-diameter particles (component A) whose average particle diameter is set in a specific range as the roughness-forming particles are different from the non-conductive large-diameter particles (A component). A coating film forming solution is prepared in combination with the small-diameter non-conductive small-diameter particles (component (B)), and this is spirally applied to the outer peripheral surface of the shaft in a substantially vertical state to form a coating film layer. . for that reason,
On the outer peripheral surface of the base rubber layer, a part of the coating liquid is smoothly applied from the spiral coating film forming solution application portion to the underlying background portion (the surface portion of the base rubber layer where the solution is not applied). And the solution is applied to the ground in the same manner as the application portion. Therefore, the thickness of the obtained coating layer becomes uniform. In addition, during the dripping, small-diameter particles are coordinated around large-diameter particles to prevent uneven distribution of large-diameter particles, and unevenness and unevenness in the roughness of the coating layer surface based on uneven distribution of large-diameter particles. Thus, a uniform rough surface is formed on the surface of the coating layer. The conductive roll thus obtained has extremely excellent properties because the coating layer has a uniform and rough surface. Besides,
Since the components (A) and (B) are non-conductive particles, the coating layer obtained is a high resistance layer. as a result,
The pressure resistance of the conductive roll on which the coating layer is formed is increased,
When it is used by incorporating it into an electrophotographic copying machine, for example, as a developing roll, in combination with the excellent properties of the above-mentioned coating layer, there is no unevenness in the amount of toner transported, and an effect of obtaining an image with a uniform density can be obtained. Become.
【図1】本発明の現像ロールの一例を示す断面図であ
る。FIG. 1 is a sectional view showing an example of a developing roll of the present invention.
【図2】本発明に用いる塗布装置の概略説明図である。FIG. 2 is a schematic explanatory view of a coating apparatus used in the present invention.
【図3】塗布装置の詳細を示す斜視図である。FIG. 3 is a perspective view showing details of a coating apparatus.
【図4】本発明の現像ロールの塗膜層形成状態を示す要
部拡大図であって、(a)はベースロール外周面に螺旋
状に塗膜形成用溶液を塗布した直後の状態を示す要部拡
大図であり、(b)は上記溶液が液垂れした後乾燥した
状態を示す要部拡大図である。FIG. 4 is an enlarged view of a main part showing a coating layer formation state of a developing roll of the present invention, wherein (a) shows a state immediately after a coating film forming solution is spirally applied to an outer peripheral surface of a base roll. It is a principal part enlarged view, (b) is a principal part enlarged view which shows the state which the said solution dripped and dried.
【図5】ロールコート法による、ロール表面への塗膜形
成用溶液の塗布状態を示す模式的説明図である。FIG. 5 is a schematic explanatory view showing a coating state of a coating film forming solution on a roll surface by a roll coating method.
1 ベースロール 2 塗布部 4 小径粒子 5 塗膜層 6 大径粒子 DESCRIPTION OF SYMBOLS 1 Base roll 2 Coating part 4 Small diameter particle 5 Coating layer 6 Large diameter particle
───────────────────────────────────────────────────── フロントページの続き Fターム(参考) 2H077 AD06 FA13 FA22 FA25 FA29 3J103 AA02 AA13 AA21 AA85 EA06 FA18 GA02 GA57 GA58 HA04 HA12 HA20 HA43 HA46 HA48 HA53 HA54 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H077 AD06 FA13 FA22 FA25 FA29 3J103 AA02 AA13 AA21 AA85 EA06 FA18 GA02 GA57 GA58 HA04 HA12 HA20 HA43 HA46 HA48 HA53 HA54
Claims (3)
膜形成用溶液を準備する工程と、上記ゴム層付きの軸体
を略垂直にした状態でゴム層の外周面に塗膜形成用溶液
を螺旋状に塗布する工程と、上記塗膜形成用溶液を塗布
したゴム層付きの軸体を乾燥し、軸体のゴム層の外周面
に上記塗膜形成用溶液からなる塗膜層を形成する工程と
を備え、上記塗膜形成用溶液が塗膜形成用のマトリック
ス成分、下記の(A)および(B)成分を含有している
ことを特徴とする導電ロールの製造方法。 (A)平均粒径1〜12μmの範囲に設定されている非
導電性大径粒子。 (B)平均粒径0.1μm以上1μm未満の範囲に設定
されている非導電性小径粒子。1. A step of preparing a shaft having a rubber layer formed on its outer periphery and a coating solution, and forming a film on the outer peripheral surface of the rubber layer with the shaft with the rubber layer being substantially vertical. Spirally applying the coating solution, and drying the shaft with the rubber layer coated with the coating film forming solution, and forming a coating layer comprising the coating film forming solution on the outer peripheral surface of the rubber layer of the shaft. And a method for producing a conductive roll, wherein the coating film forming solution contains a matrix component for forming a coating film, and the following components (A) and (B). (A) Non-conductive large-diameter particles whose average particle size is set in the range of 1 to 12 μm. (B) Non-conductive small-diameter particles having an average particle size of not less than 0.1 μm and less than 1 μm.
ックス成分100重量部に対して、5〜150重量部の
範囲に設定されている請求項1記載の導電ロールの製造
方法。2. The method according to claim 1, wherein the content of the component (B) is set in a range of 5 to 150 parts by weight based on 100 parts by weight of the matrix component.
造方法により得られる導電ロール。3. A conductive roll obtained by the method for producing a conductive roll according to claim 1.
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JP31417199A JP3925014B2 (en) | 1999-11-04 | 1999-11-04 | Method for producing conductive roll and conductive roll obtained thereby |
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JP31417199A JP3925014B2 (en) | 1999-11-04 | 1999-11-04 | Method for producing conductive roll and conductive roll obtained thereby |
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JP3925014B2 JP3925014B2 (en) | 2007-06-06 |
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004295052A (en) * | 2003-03-28 | 2004-10-21 | Tokai Rubber Ind Ltd | Method for manufacturing roll for electrophotographic device |
JP2007233255A (en) * | 2006-03-03 | 2007-09-13 | Tokai Rubber Ind Ltd | Developing roll |
JP2014111253A (en) * | 2012-10-29 | 2014-06-19 | Canon Inc | Coating apparatus, coating method, manufacturing apparatus of fastening member, manufacturing method of fastening member, and fastening member |
JP2014174512A (en) * | 2013-03-13 | 2014-09-22 | Shin Etsu Polymer Co Ltd | Conductive roller, developing device, and image forming apparatus |
-
1999
- 1999-11-04 JP JP31417199A patent/JP3925014B2/en not_active Expired - Fee Related
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004295052A (en) * | 2003-03-28 | 2004-10-21 | Tokai Rubber Ind Ltd | Method for manufacturing roll for electrophotographic device |
JP2007233255A (en) * | 2006-03-03 | 2007-09-13 | Tokai Rubber Ind Ltd | Developing roll |
JP2014111253A (en) * | 2012-10-29 | 2014-06-19 | Canon Inc | Coating apparatus, coating method, manufacturing apparatus of fastening member, manufacturing method of fastening member, and fastening member |
US9857739B2 (en) | 2012-10-29 | 2018-01-02 | Canon Kabushiki Kaisha | Coating apparatus, coating method, fixing member manufacturing apparatus, fixing member manufacturing method and fixing member |
JP2014174512A (en) * | 2013-03-13 | 2014-09-22 | Shin Etsu Polymer Co Ltd | Conductive roller, developing device, and image forming apparatus |
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