JP5638626B2 - OA roller manufacturing method and OA roller - Google Patents

OA roller manufacturing method and OA roller Download PDF

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JP5638626B2
JP5638626B2 JP2012548815A JP2012548815A JP5638626B2 JP 5638626 B2 JP5638626 B2 JP 5638626B2 JP 2012548815 A JP2012548815 A JP 2012548815A JP 2012548815 A JP2012548815 A JP 2012548815A JP 5638626 B2 JP5638626 B2 JP 5638626B2
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roller
shaft
elastic layer
roller material
cylindrical
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JPWO2012081626A1 (en
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亨 益山
亨 益山
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Bridgestone Corp
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/08—Details of powder developing device not concerning the development directly
    • G03G2215/0855—Materials and manufacturing of the developing device
    • G03G2215/0858—Donor member
    • G03G2215/0863—Manufacturing
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/16—Transferring device, details
    • G03G2215/1604—Main transfer electrode
    • G03G2215/1614—Transfer roll
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/20—Details of the fixing device or porcess
    • G03G2215/2003—Structural features of the fixing device
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2221/00—Processes not provided for by group G03G2215/00, e.g. cleaning or residual charge elimination
    • G03G2221/0005—Cleaning of residual toner

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Electrophotography Configuration And Component (AREA)
  • Dry Development In Electrophotography (AREA)
  • Cleaning In Electrography (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)

Description

本発明は、ＯＡローラの製造方法及びＯＡローラに関する。   The present invention relates to an OA roller manufacturing method and an OA roller.

オフィスオートメーション機器（ＯＡ機器）のなかで、複写機やプリンタ、ファクシミリ等のような電子写真方式を用いた画像形成装置においては、転写ローラ、トナー供給ローラ、クリーニングローラ等の各種のローラが用いられている。これらのローラを総称したＯＡローラは、回転軸としてのシャフトの外周に、樹脂発泡体、例えばポリウレタン発泡体よりなる弾性層が円柱形状に形成された基本構造を備えている。   Among office automation equipment (OA equipment), various types of rollers such as transfer rollers, toner supply rollers, and cleaning rollers are used in electrophotographic image forming apparatuses such as copying machines, printers, and facsimiles. ing. The OA roller, which is a collective term for these rollers, has a basic structure in which an elastic layer made of a resin foam, for example, a polyurethane foam, is formed in a cylindrical shape on the outer periphery of a shaft serving as a rotating shaft.

ＯＡローラの製造方法は、大別すると３種の方法がある。第一の方法は、金属製等のシャフトに必要に応じて接着剤等を塗布し、そのシャフトの外周に樹脂発泡体からなる弾性層材料を取りつけて固定し、その後に、弾性層材料を所望のサイズの円柱形状になるように研磨等をする方法である（特許文献１、特許文献２）。第二の方法は、第一の方法と同様にシャフトの外周に樹脂発泡体からなる弾性層材料を取りつけて固定した後、弾性層材料を所望のサイズの円柱形状になるように熱線で加工する方法である。第三の方法は、金型のキャビティに予めシャフトを配置しておき、このキャビティ内にゴム又は樹脂発泡体材料を射出してＯＡローラを得る方法である。   The OA roller manufacturing method is roughly classified into three types. The first method is to apply an adhesive or the like to a shaft made of metal, etc., if necessary, attach and fix an elastic layer material made of a resin foam on the outer periphery of the shaft, and then the elastic layer material is desired (Patent Document 1, Patent Document 2). In the second method, an elastic layer material made of a resin foam is attached and fixed to the outer periphery of the shaft in the same manner as in the first method, and then the elastic layer material is processed with a hot wire so as to have a cylindrical shape of a desired size. Is the method. The third method is a method in which a shaft is arranged in advance in a cavity of a mold, and rubber or resin foam material is injected into the cavity to obtain an OA roller.

しかしながら、弾性層材料を研磨、研削又は切削により加工する第一の方法は、加工の際に弾性層の表面にケバ立ちが生じていた。また、弾性層材料を熱線で加工する第二の方法は、ローラの周面を均一に仕上げることが難しく、しかも熱線加工である故にローラの表面が熱により硬化したり、表面の発泡セルが破れたりする不具合があった。更に、射出成形で加工する第三の方法は、金型等の製作をする必要があることから製造コストが嵩み、かつ、金型内で発泡体の発泡状態を調整するのが難しいため、ローラの表面を低硬度で平滑な状態に均一にするのが難しかった。   However, in the first method of processing the elastic layer material by polishing, grinding, or cutting, the surface of the elastic layer is rubbed during processing. In addition, the second method of processing the elastic layer material with heat rays makes it difficult to uniformly finish the peripheral surface of the roller, and because of the heat ray processing, the surface of the roller is hardened by heat or the foam cells on the surface are torn. There was a malfunction. Furthermore, since the third method of processing by injection molding requires the production of a mold or the like, the manufacturing cost is high, and it is difficult to adjust the foaming state of the foam in the mold, It was difficult to make the surface of the roller uniform in a smooth state with low hardness.

ケバ立ちや熱硬化やコスト上昇を招かないＯＡローラの製造方法に関して、所望のローラ径よりも大きい径のローラ材を作製したのち、そのローラ材の外径よりも小径の円筒状成形具に当該ローラ材を挿入してローラの弾性層を圧縮してから加熱する、ローラの製造方法がある（特許文献３）。この製造方法により得られたローラは、弾性層の樹脂発泡体のセルがローラの径方向に圧縮された形状で、表面におけるセル数がローラ径方向内部のセル数よりも多くなっていて、ローラ表面のケバ立ちがなく、平滑なローラとなっている。   Regarding a method for manufacturing an OA roller that does not cause fluffing, thermal curing, or cost increase, after producing a roller material having a diameter larger than a desired roller diameter, the cylindrical molding tool having a diameter smaller than the outer diameter of the roller material There is a method for manufacturing a roller in which a roller material is inserted and the elastic layer of the roller is compressed and then heated (Patent Document 3). The roller obtained by this manufacturing method has a shape in which the cells of the resin foam of the elastic layer are compressed in the radial direction of the roller, and the number of cells on the surface is larger than the number of cells inside the roller radial direction. The surface is free from flaking and is a smooth roller.

特開２００８−２９９００６号公報JP 2008-299006 A 特開２００１−２２５２０１号公報JP 2001-225201 A 特開平９−２９７５１２号公報JP-A-9-297512

しかしながら、特許文献３に記載の製造方法により得られたローラは、弾性層表面のケバ立ち抑制を改善することができるが、円筒状成形具に一方向からローラを挿入することにより、弾性層を構成する樹脂発泡体のセルに、ローラのシャフト軸方向に歪が生じていた。この歪が生じていると、例えばＯＡローラがトナー供給ローラに適用される場合には、所定量でのトナー供給ができなかったり、トナーの詰まりが発生したりして、このトナー供給ローラを組み込んだ画像形成装置における画像不具合を引き起こすおそれがあり、また、転写ローラやクリーニングローラ等においても、不具合を引き起こすおそれがある。したがって、ＯＡローラに要求される特性として、なお改善の余地があった。   However, the roller obtained by the manufacturing method described in Patent Document 3 can improve the suppression of the fluffing on the surface of the elastic layer, but the elastic layer is removed by inserting the roller into the cylindrical forming tool from one direction. In the resin foam cell to be formed, distortion occurred in the axial direction of the roller shaft. When this distortion occurs, for example, when an OA roller is applied to the toner supply roller, the toner supply at a predetermined amount cannot be performed or the toner is clogged. However, there is a risk of causing an image defect in the image forming apparatus, and also in a transfer roller, a cleaning roller, or the like. Therefore, there is still room for improvement as a characteristic required for the OA roller.

本発明は、上記の問題を有利に解決するものであり、ケバ立ちのなく表面が平滑で、シャフト軸方向のセル歪が生じていないＯＡローラ製造することのできるＯＡローラの製造方法及びこの製造方法を用いて得られたＯＡローラを提供することを目的とする。   The present invention advantageously solves the above-described problem, and a method of manufacturing an OA roller capable of manufacturing an OA roller that is smooth and has a smooth surface and is free from cell distortion in the shaft axial direction. An object is to provide an OA roller obtained by using the method.

上記課題を解決する、本発明のＯＡローラの製造方法は、シャフトと、このシャフトの外周に形成された樹脂発泡体よりなる円柱形状の弾性層と、を有し、この弾性層が最終の外径よりも大きな外径を有しているローラ材を用意する工程と、このローラ材の弾性層の外径よりも小さな内径を有する円筒状成形具内に、ローラ材の弾性層を圧縮させながら当該ローラ材を挿入する工程と、この円筒状成形具内のローラ材の弾性層に生じたシャフト軸方向の歪を除去するようにシャフトを挿入方向とは逆方向に移動させる工程と、ローラ材を円筒状成形具と共に加熱する工程と、加熱後のローラ材を円筒状成形具から取り外すことで最終の外径の弾性層を有するローラを得る工程とを備えることを特徴とする。   The manufacturing method of the OA roller of the present invention that solves the above-described problem has a shaft and a cylindrical elastic layer made of a resin foam formed on the outer periphery of the shaft, and the elastic layer is the final outer layer. A step of preparing a roller material having an outer diameter larger than the diameter, and while compressing the elastic layer of the roller material in a cylindrical forming tool having an inner diameter smaller than the outer diameter of the elastic layer of the roller material A step of inserting the roller material, a step of moving the shaft in a direction opposite to the insertion direction so as to remove distortion in the shaft axial direction generated in the elastic layer of the roller material in the cylindrical molding tool, and the roller material And a step of heating together with the cylindrical forming tool and a step of obtaining a roller having an elastic layer having a final outer diameter by removing the heated roller material from the cylindrical forming tool.

本発明のＯＡローラの製造方法は、シャフトを挿入方向とは逆方向に移動させる工程において、ローラ材のシャフトを、円筒状成形具内のローラ材の弾性層に生じたシャフト軸方向の歪み量で定められる量で移動させることが好ましい。樹脂発泡体は、ウレタンフォームであることが好ましく、また、加熱する工程の際は、ローラ材のシャフトの少なくとも一端を保持部材により保持することが好ましい。   In the method for manufacturing an OA roller according to the present invention, in the step of moving the shaft in the direction opposite to the insertion direction, the amount of strain in the axial direction of the shaft of the roller material generated in the elastic layer of the roller material in the cylindrical forming tool. It is preferable to move by an amount determined by The resin foam is preferably urethane foam, and in the heating step, it is preferable to hold at least one end of the shaft of the roller material by the holding member.

本発明のＯＡローラは、本発明のＯＡローラの製造方法により製造されるものであって、シャフトと、このシャフトの外周に形成された樹脂発泡体よりなる円柱形状の弾性層と、を備え、この弾性層の表面近傍の樹脂発泡体のセルがローラの径方向に圧縮変形され、シャフトの軸方向の歪が除去された形状を有することを特徴とする。   The OA roller of the present invention is manufactured by the manufacturing method of the OA roller of the present invention, and includes a shaft and a cylindrical elastic layer made of a resin foam formed on the outer periphery of the shaft, The resin foam cell in the vicinity of the surface of the elastic layer is compressed and deformed in the radial direction of the roller, and has a shape in which the axial strain of the shaft is removed.

本発明のＯＡローラの製造方法によれば、円筒状成形具にローラ材を挿入したときに弾性層に生じるシャフト軸方向の歪を、挿入方向とは逆方向にシャフトを移動させることにより除去することができる。これにより、弾性層を構成する発泡体のセルにローラのシャフト軸方向の歪が生じていない、良好な特性のＯＡローラを製造することができる。   According to the manufacturing method of the OA roller of the present invention, the distortion in the shaft axial direction generated in the elastic layer when the roller material is inserted into the cylindrical forming tool is removed by moving the shaft in the direction opposite to the insertion direction. be able to. As a result, it is possible to manufacture an OA roller having good characteristics in which the foam cell constituting the elastic layer is not distorted in the shaft axial direction of the roller.

本発明の製造方法の実施形態を説明する時系列順の模式図である。It is a schematic diagram of the time series order explaining embodiment of the manufacturing method of this invention. ローラ材の弾性層の先後端近傍の形状を示す模式図である。It is a schematic diagram which shows the shape of the front-rear end vicinity of the elastic layer of a roller material. 発泡体セル形状の顕微鏡写真である。It is a microscope picture of a foam cell shape. ローラ材の弾性層の先後端近傍の形状を示す模式図である。It is a schematic diagram which shows the shape of the front-rear end vicinity of the elastic layer of a roller material. 発泡体セル形状の顕微鏡写真である。It is a microscope picture of a foam cell shape. 歪み量の測定方法の一例の説明図である。It is explanatory drawing of an example of the measuring method of distortion amount. 保持部材の説明図である。It is explanatory drawing of a holding member. 実施例の振れ特性を示すグラフである。It is a graph which shows the shake characteristic of an Example. 実施例の外径を示すグラフである。It is a graph which shows the outer diameter of an Example.

以下、本発明のＯＡローラの製造方法及びＯＡローラの実施の形態について、図面を用いつつ具体的に説明する。   Hereinafter, the manufacturing method of the OA roller and the embodiment of the OA roller according to the present invention will be described in detail with reference to the drawings.

図１に、本発明の製造方法の実施形態を説明する時系列順の模式図を示す。図１（ａ）に示すように、まずローラ材１０を用意する。このローラ材１０は、シャフト１１と、このシャフト１１の外周に形成された樹脂発泡体よりなる円柱形状の弾性層１２とから構成されている。シャフト１１は、本発明で製造するＯＡローラにおける回転軸となるものであり、形状、材料、サイズ等について特に限定されるものではなく、通常のＯＡローラに適用されるものとすることができる。例えば、材料は金属製であってもよく、樹脂製であってもよい。また、シャフト１１は中実形状であってもよいし、中空形状であってもよい。   In FIG. 1, the schematic diagram of the time-sequential order explaining embodiment of the manufacturing method of this invention is shown. As shown in FIG. 1A, a roller material 10 is first prepared. The roller material 10 includes a shaft 11 and a cylindrical elastic layer 12 made of a resin foam formed on the outer periphery of the shaft 11. The shaft 11 serves as a rotation axis in the OA roller manufactured in the present invention, and is not particularly limited in shape, material, size, and the like, and can be applied to a normal OA roller. For example, the material may be made of metal or resin. Further, the shaft 11 may be a solid shape or a hollow shape.

このシャフト１１の外周に形成された弾性層１２は、本発明で製造するＯＡローラにおける弾性層に対応するものである。弾性層１２は、必要に応じて接着剤によりシャフト１１と固着される。   The elastic layer 12 formed on the outer periphery of the shaft 11 corresponds to the elastic layer in the OA roller manufactured in the present invention. The elastic layer 12 is fixed to the shaft 11 with an adhesive as necessary.

弾性層１２の材料の樹脂発泡体は、特に限定されるものではないが、ウレタンフォームとすることができる。ウレタンフォームに用いるポリウレタン樹脂としては、従来公知の材料を適宜選択して用いることができ、特に制限されるものではない。また、ポリウレタン発泡体の発泡倍率としては、特に制限されるものではないが、１．２〜５０倍、特には１０〜２５倍程度が好ましく、フォーム密度は、０．０４〜０．１ｇ／ｃｍ３程度が好ましい。The resin foam of the material of the elastic layer 12 is not particularly limited, but can be urethane foam. As the polyurethane resin used for the urethane foam, a conventionally known material can be appropriately selected and used, and is not particularly limited. The foaming ratio of the polyurethane foam is not particularly limited, but is preferably 1.2 to 50 times, particularly preferably about 10 to 25 times, and the foam density is 0.04 to 0.1 g / cm. About 3 is preferable.

弾性層１２の外径は、本発明の製造方法による得られるＯＡローラの外径、すなわち最終の外径よりも大きな外径を有しているものとする。弾性層１２は、ＯＡローラの円柱形状と相似する円柱形状とすることが好ましい。このような円柱形状は、樹脂発泡体のシートから方形又は多角形断面のブロックを切り出してシャフト１１に取り付け固定したのち、公知の方法、例えば研磨、研削、切削等により樹脂発泡体を円柱形状に加工することにより得られる。もっとも、場合によっては、円柱形状ではなく、方形又は多角形断面形状とすることもできる。   It is assumed that the outer diameter of the elastic layer 12 has an outer diameter larger than the outer diameter of the OA roller obtained by the manufacturing method of the present invention, that is, the final outer diameter. It is preferable that the elastic layer 12 has a cylindrical shape similar to the cylindrical shape of the OA roller. Such a columnar shape is obtained by cutting a block having a square or polygonal cross section from a sheet of resin foam and attaching and fixing the block to the shaft 11, and then converting the resin foam into a columnar shape by a known method such as polishing, grinding, cutting, or the like. It is obtained by processing. However, depending on the case, it may be a rectangular or polygonal cross-sectional shape instead of a cylindrical shape.

次に、図１（ｂ）に示すように、円筒状成形具ｍを用意する。円筒状成形具ｍは、円筒形状であり、中心軸方向の長さは、ローラ材１０の弾性層１２よりも長い。内径は製造するＯＡローラの外径とほぼ同じ径で、ＯＡローラの外径との隙間を考慮して、わずかに大きな内径とするのがよい。ＯＡローラの外径にもよるが、例えばＯＡローラの外径よりも０．１ｍｍ大きな内径とすることができる。   Next, as shown in FIG. 1B, a cylindrical forming tool m is prepared. The cylindrical forming tool m has a cylindrical shape, and the length in the central axis direction is longer than the elastic layer 12 of the roller material 10. The inner diameter is substantially the same as the outer diameter of the OA roller to be manufactured, and it is preferable to make the inner diameter slightly larger in consideration of the gap with the outer diameter of the OA roller. Depending on the outer diameter of the OA roller, for example, the inner diameter can be 0.1 mm larger than the outer diameter of the OA roller.

円筒状成形具ｍは、樹脂製又は金属製とすることができるが、後工程で円筒状成形具ｍと共に加熱することから、耐熱性があり、かつ熱伝導性が良好な金属製であることが好ましい。なかでも、アルミニウム、銅、鉄等が好ましい。円筒状成形具の内面には、摩擦係数を低下させるために、フッ素コーティング等の、樹脂発泡体を汚染しない潤滑性皮膜を形成させることもできる。   The cylindrical molding tool m can be made of resin or metal, but is heated with the cylindrical molding tool m in a later process, so that it is made of metal having heat resistance and good thermal conductivity. Is preferred. Of these, aluminum, copper, iron and the like are preferable. In order to reduce the coefficient of friction, a lubricating film that does not contaminate the resin foam, such as fluorine coating, can be formed on the inner surface of the cylindrical molding tool.

図１（ｂ）に示すように、このような円筒状成形具ｍの一端の開口からローラ材１０を挿入する。この際、ローラ材１０の弾性層１２の外径は、円筒状成形具ｍの内径よりも大きいため、弾性層１２を径方向中心に向けて圧縮させながら挿入する。弾性層の圧縮率（％）は、挿入前のローラ材１０の弾性層１２の厚さをＲとし、挿入後の圧縮された弾性層１２の厚さをｒとするとき｛（Ｒ−ｒ）／Ｒ｝×１００として表されるものであり、好適な圧縮率は、５〜５０％程度とすることが好ましい。圧縮率が下限値よりも大きいことにより、弾性層の表面近傍のセル密度を高くし、ＯＡローラ表面でトナー詰まり等を抑制することができる。圧縮率が上限値よりも小さいことにより、過度の圧縮を防止して、弾性層の弾性が損なわれることを防ぐことができる。   As shown in FIG.1 (b), the roller material 10 is inserted from the opening of one end of such a cylindrical shaping | molding tool m. At this time, since the outer diameter of the elastic layer 12 of the roller material 10 is larger than the inner diameter of the cylindrical forming tool m, the elastic layer 12 is inserted while being compressed toward the radial center. The compression rate (%) of the elastic layer is determined when R is the thickness of the elastic layer 12 of the roller material 10 before insertion, and r is the thickness of the compressed elastic layer 12 after insertion {(R−r). / R} × 100, and a preferable compression ratio is preferably about 5 to 50%. When the compression rate is larger than the lower limit, the cell density near the surface of the elastic layer can be increased, and toner clogging or the like can be suppressed on the surface of the OA roller. When the compression ratio is smaller than the upper limit value, excessive compression can be prevented and the elasticity of the elastic layer can be prevented from being impaired.

ローラ材１１を円筒状成形具ｍに挿入するための手段は、特に限定されない。適切な挿入装置を用いてもよいし、また人力により挿入してもよい。なお、ローラ材１１を円筒状成形具ｍに対して捩じりながら挿入するのは避けることが好ましい。   The means for inserting the roller material 11 into the cylindrical forming tool m is not particularly limited. An appropriate insertion device may be used, or it may be inserted manually. It is preferable to avoid inserting the roller material 11 while twisting it with respect to the cylindrical forming tool m.

挿入直後の円筒状成形具ｍの外観を図１（ｃ）に示す。また、このときの円筒状成形具ｍ内に挿入されたローラ材１１の弾性層１２の先端側の端部近傍及び後端側の端部近傍の形状を模式的に図２に示す。弾性層１２は、径方向に圧縮されるばかりでなく、円筒状成形具ｍ内に圧縮されながら挿入されるので、シャフト１１の軸方向に変形し、先端側の端部はコーン形に膨らみ、後端側の端部はカップ形に窪む形状となる。この形状のままで後工程の加熱を行うと、発泡体のセルは、図３に弾性層１２のシャフト軸方向に平行な方向における中央部において、弾性層１２表面からシャフト１１に向かう半径方向断面における発泡体セル形状の顕微鏡写真を示すように、弾性層１２の半径方向ばかりでなく、シャフト１１の軸方向に歪が加わって、発泡体セルが図の斜め方向に変形している。   The appearance of the cylindrical forming tool m immediately after insertion is shown in FIG. Moreover, the shape of the vicinity of the end part of the elastic layer 12 of the roller material 11 inserted in the cylindrical forming tool m at this time and the vicinity of the end part of the rear end side are schematically shown in FIG. The elastic layer 12 is not only compressed in the radial direction but also inserted while being compressed into the cylindrical forming tool m, so that it deforms in the axial direction of the shaft 11 and the end on the tip side swells in a cone shape, The end on the rear end side is recessed in a cup shape. When the subsequent heating is performed in this shape, the foam cell has a radial cross section from the surface of the elastic layer 12 toward the shaft 11 in the central portion in the direction parallel to the shaft axis direction of the elastic layer 12 in FIG. As shown in the micrograph of the foam cell shape in FIG. 1, not only the radial direction of the elastic layer 12 but also the axial direction of the shaft 11 is distorted, and the foam cell is deformed in the oblique direction of the figure.

そこで、本発明の製造方法の実施形態では、円筒状成形具ｍ内のローラ材１０の弾性層１２に生じたシャフト軸方向の歪を除去するように、シャフト１１を挿入方向とは逆方向に移動させる。移動後の円筒状成形具ｍの外観を図１（ｄ）に示す。また、このときの円筒状成形具ｍ内に挿入されたローラ材１１の弾性層１２の先端側の端部近傍及び後端側の端部近傍の形状を模式的に図４に示す。図４から分かるように、弾性層１２は、先端側の端部及び後端側の端部のいずれも、ほぼ平坦な形状となる。この形状を維持して後工程の加熱を行うと、発泡体のセルは、図５に弾性層１２のシャフト軸方向に平行な方向における中央部において、弾性層１２表面からシャフト１１に向かう半径方向断面における発泡体セル形状の顕微鏡写真を示すように、発泡体セルはシャフト１１の軸方向に歪が除去されて、半径方向に変形している。   Therefore, in the embodiment of the manufacturing method of the present invention, the shaft 11 is moved in the direction opposite to the insertion direction so as to remove the distortion in the shaft axial direction generated in the elastic layer 12 of the roller material 10 in the cylindrical forming tool m. Move. The appearance of the cylindrical forming tool m after movement is shown in FIG. Moreover, the shape of the vicinity of the end part of the elastic layer 12 of the roller material 11 inserted in the cylindrical forming tool m at this time and the vicinity of the end part of the rear end side are schematically shown in FIG. As can be seen from FIG. 4, the elastic layer 12 has a substantially flat shape at both the end on the front end side and the end on the rear end side. When heating is performed in the subsequent process while maintaining this shape, the foam cell is in the radial direction from the surface of the elastic layer 12 toward the shaft 11 in the central portion of the elastic layer 12 in the direction parallel to the axial direction of the shaft in FIG. As shown in the micrograph of the foam cell shape in the cross section, the foam cell is deformed in the radial direction with strain removed in the axial direction of the shaft 11.

本実施形態の製造方法は、上述のように円筒状成形具ｍ内のローラ材１０の弾性層１２に生じたシャフト軸方向の歪を除去するように、シャフト１１を挿入方向とは逆方向に移動させることから、得られたＯＡローラは、弾性層を構成する発泡体のセルにローラのシャフト軸方向の歪が解消される。そのため、ＯＡローラによって搬送されるトナー等の詰まりを防止することでき、また、弾性層の長さ方向で歪の大きさがローラの長さ方向に変動することもないので、ＯＡ機器にＯＡローラを組み込んだ場合に良好な画像形成特性が得られる。   In the manufacturing method of the present embodiment, the shaft 11 is placed in the direction opposite to the insertion direction so as to remove the distortion in the shaft axial direction generated in the elastic layer 12 of the roller material 10 in the cylindrical forming tool m as described above. Since the obtained OA roller is moved, the distortion in the shaft axial direction of the roller is eliminated in the foam cell constituting the elastic layer. Therefore, clogging of toner or the like conveyed by the OA roller can be prevented, and the magnitude of strain does not vary in the length direction of the elastic layer. Good image forming characteristics can be obtained when the is incorporated.

シャフト１１を挿入方向とは逆方向に移動させる量は、円筒状成形具ｍ内のローラ材１０の弾性層１２に生じたシャフト１１軸方向の歪み量により定められる量、より具体的には、当該歪み量と同じ量又は実質的に同じ量とすることが好ましい。実質的に同じ量とは、歪み量±１ｍｍ以内の量のことをいう。シャフト１１の移動量を、このような歪み量により定められる量とすることにより、弾性層１２に生じたシャフト軸方向の歪を、より効果的に除去することができる。シャフト１１の好ましい移動量の具体的範囲は、２〜１０ｍｍであり、より好ましい範囲は、２〜４ｍｍである。   The amount by which the shaft 11 is moved in the direction opposite to the insertion direction is an amount determined by the amount of strain in the axial direction of the shaft 11 generated in the elastic layer 12 of the roller material 10 in the cylindrical forming tool m, more specifically, The amount is preferably the same or substantially the same as the amount of distortion. “Substantially the same amount” means an amount within ± 1 mm of distortion. By setting the movement amount of the shaft 11 to an amount determined by such a strain amount, the strain in the shaft axis direction generated in the elastic layer 12 can be more effectively removed. A specific range of a preferable moving amount of the shaft 11 is 2 to 10 mm, and a more preferable range is 2 to 4 mm.

円筒状成形具ｍ内のローラ材１０の弾性層１２に生じたシャフト１１軸方向の歪み量は、次のようにして測定することができる。図６に示す、当該歪み量の測定方法の一例の説明図において、まず、ナイフｋを用いて、ローラ材１０の弾性層１２の表面から中心に向かう半径方向の切り込みｃを、シャフト１１の軸方向に沿って形成する（図６（ａ））。この切り込みｃは、図示した例ではローラ材１１の弾性層１２の先端側の端部近傍、後端側の端部近傍及び軸方向中央部近傍の合計３か所に形成されているが、３か所である場合に限定されない。なお、図６（ａ）に示したローラ材１０は、本発明の理解を容易にするために模式的に描かれており、ローラ材の寸法形状、切り込みｃのサイズは、図示した例に限定されるものではない。   The amount of strain in the axial direction of the shaft 11 generated in the elastic layer 12 of the roller material 10 in the cylindrical forming tool m can be measured as follows. In the explanatory view of an example of the measurement method of the distortion amount shown in FIG. 6, first, using a knife k, a radial cut c from the surface of the elastic layer 12 of the roller material 10 toward the center is formed on the axis of the shaft 11. It forms along a direction (Fig.6 (a)). In the illustrated example, the cuts c are formed at a total of three locations in the vicinity of the end portion on the front end side of the elastic layer 12 of the roller material 11, the vicinity of the end portion on the rear end side, and the vicinity of the central portion in the axial direction. It is not limited to a place. Note that the roller material 10 shown in FIG. 6A is schematically drawn for easy understanding of the present invention, and the dimensional shape of the roller material and the size of the notch c are limited to the illustrated example. Is not to be done.

次に、図６（ｂ）に弾性層１２の切り込みｃの１つについての、当該弾性層１２の半径方向断面を示すように、切り込みｃ内に、シャフト１１の軸方向に対して垂直な方向の直線Ｌを描く。この直線Ｌを描く手段は特に限定されないが、本発明の製造方法において実施される加熱工程で直線Ｌが消えないような手段とする。例えば油性インクのペンを用いることができる。   Next, a direction perpendicular to the axial direction of the shaft 11 in the notch c is shown in FIG. 6B, so that one of the notches c in the elastic layer 12 shows a radial section of the elastic layer 12. A straight line L is drawn. The means for drawing the straight line L is not particularly limited, but means for preventing the straight line L from disappearing in the heating step performed in the manufacturing method of the present invention. For example, an oil-based ink pen can be used.

次に、直線Ｌが描かれた切り込みｃを弾性層１２に有するローラ材１０を、円筒状成形具ｍに挿入する。挿入後は、ローラ材１０のシャフト１１を、挿入方向とは逆方向に移動させないで、又は所定量で移動させて、ローラ材１０を円筒状成形具ｍと共に加熱する。   Next, the roller material 10 having the cut c in which the straight line L is drawn in the elastic layer 12 is inserted into the cylindrical forming tool m. After the insertion, the roller material 10 is heated together with the cylindrical forming tool m without moving the shaft 11 of the roller material 10 in a direction opposite to the insertion direction or by a predetermined amount.

加熱後はローラ材１０を円筒状成形具ｍから取り外す。得られたローラの弾性層２に形成されている切り込みｃの１つについての、当該弾性層２の半径方向断面を、ローラ材１０のシャフト１１を、挿入方向とは逆方向に移動させなかった場合について図６（ｃ）に示す。この図６（ｃ）から分かるように、ローラ材１０のシャフト１１を、挿入方向とは逆方向に移動させなかった場合には、弾性層２はシャフト軸方向に歪み、この歪みにより切り込みｃに描かれた直線Ｌは、シャフト１１の軸方向に対して垂直な方向に対して傾斜している。このような直線Ｌのシャフト軸方向の変位量ｄを、弾性層２の先端側の端部近傍、後端側の端部近傍及び軸方向中央部近傍の合計３か所の切り込みでそれぞれ測定する。測定された値の平均値を、円筒状成形具ｍ内にローラ材１０を挿入したときの当該ローラ材１０の弾性層１２に生じたシャフト１１軸方向の歪み量とする。このようにして、円筒状成形具ｍ内のローラ材１０の弾性層１２に生じたシャフト１１軸方向の歪み量を測定することができる。   After heating, the roller material 10 is removed from the cylindrical forming tool m. For one of the cuts c formed in the elastic layer 2 of the obtained roller, the radial section of the elastic layer 2 was not moved in the direction opposite to the insertion direction of the shaft 11 of the roller material 10. The case is shown in FIG. As can be seen from FIG. 6C, when the shaft 11 of the roller material 10 is not moved in the direction opposite to the insertion direction, the elastic layer 2 is distorted in the axial direction of the shaft. The drawn straight line L is inclined with respect to a direction perpendicular to the axial direction of the shaft 11. The displacement d in the shaft axial direction of the straight line L is measured by a total of three incisions in the vicinity of the end portion on the front end side, in the vicinity of the end portion on the rear end side and in the vicinity of the central portion in the axial direction. . The average value of the measured values is defined as the amount of strain in the axial direction of the shaft 11 generated in the elastic layer 12 of the roller material 10 when the roller material 10 is inserted into the cylindrical forming tool m. In this way, the amount of strain in the axial direction of the shaft 11 generated in the elastic layer 12 of the roller material 10 in the cylindrical forming tool m can be measured.

そして、測定に用いたのと寸法、材料が同じローラ材を、同じ寸法、材料の円筒状成形具ｍを用いて本発明に従ってＯＡローラを製造する際は、シャフトを挿入方向とは逆方向に移動させる工程において、シャフトの移動量を、上述した、ローラ材１０のシャフト１１を、挿入方向とは逆方向に移動させなかった場合における、測定された歪み量と同じ又は実質的に同じ量とすることができる。これによりローラ材の弾性層に生じたシャフト軸方向の歪を効果的に除去することができる。   When an OA roller is manufactured according to the present invention using a cylindrical molding tool m having the same size and material as that of the same size and material as that used for the measurement, the shaft is set in the direction opposite to the insertion direction. In the moving step, the movement amount of the shaft is the same as or substantially the same as the measured distortion amount when the shaft 11 of the roller material 10 described above is not moved in the direction opposite to the insertion direction. can do. Thereby, the distortion of the shaft axial direction which arose in the elastic layer of roller material can be removed effectively.

次に図１（ｅ）に示すように、ローラ材を円筒状成形具ｍと共に加熱する。加熱手段は、特に限定されない。図１（ｅ）では、既存の加熱装置ｔを用いている。また、加熱温度、加熱時間も特に限定されない。もっとも、ローラ材１０の弾性層１２表面に生じていたケバ立ちを防止するためには、当該ケバ立ちを防止し得る加熱温度、加熱時間の条件があるので、その条件にしたがって加熱すればよい。加熱条件の一例として、弾性層１２の樹脂発泡体がウレタンフォームである場合に、１５０℃以上、６０分以上加熱することにより、ケバ立ちを防止することができる。より好ましい温度範囲は１５０℃以上２５０℃以下である。加熱時間は、あまりに長くしてもケバ立ち防止の効果が飽和するので、省エネルギーの観点から２４０分以下とすることが好ましい。   Next, as shown in FIG. 1E, the roller material is heated together with the cylindrical forming tool m. The heating means is not particularly limited. In FIG.1 (e), the existing heating apparatus t is used. Further, the heating temperature and the heating time are not particularly limited. However, since there are heating temperature and heating time conditions that can prevent the flaking from occurring in order to prevent the flaking from occurring on the surface of the elastic layer 12 of the roller material 10, heating may be performed according to the conditions. As an example of the heating condition, when the resin foam of the elastic layer 12 is urethane foam, it is possible to prevent fluffing by heating at 150 ° C. or more for 60 minutes or more. A more preferable temperature range is 150 ° C. or higher and 250 ° C. or lower. The heating time is preferably set to 240 minutes or less from the viewpoint of energy saving, since the effect of preventing flashing is saturated even if the heating time is too long.

上記加熱後は、円筒状成形具ｍ内のローラ材１０は、その弾性層の表面のセル密度が高く、ケバ立ちのない、平滑な表面が得られている。したがって、円筒状成形具ｍからローラ材１０を取り外すことにより、弾性層に対して別途に減径加工を施すことなく最終の外径の弾性層を有するＯＡローラが得られる（図１（ｆ））。この加熱後に、ローラ材１０の温度が高い状態でローラ材１０を取り外すと、弾性層の外径が所望の径よりも大きくなる場合があり、また、円筒状成形具ｍから取り外す際にシャフト軸方向の歪が弾性層に加わるおそれがある。したがって、ローラ材１０は充分に降温させてから取り外すことが好ましく、例えば、５０℃〜室温程度まで降温させてから、取り外すことが好ましい。この降温は、大気中放冷でもよいし、加熱装置内で緩冷してもよいし、また、処理時間短縮のために冷却装置を用いて冷却してもよい。   After the heating, the roller material 10 in the cylindrical forming tool m has a high cell density on the surface of the elastic layer, and a smooth surface free from flaking is obtained. Therefore, by removing the roller material 10 from the cylindrical forming tool m, an OA roller having an elastic layer having a final outer diameter can be obtained without separately reducing the diameter of the elastic layer (FIG. 1 (f)). ). After the heating, if the roller material 10 is removed while the temperature of the roller material 10 is high, the outer diameter of the elastic layer may be larger than the desired diameter, and the shaft shaft may be removed when the roller material 10 is removed from the cylindrical forming tool m. Directional strain may be applied to the elastic layer. Therefore, it is preferable to remove the roller material 10 after sufficiently lowering the temperature. For example, it is preferable to remove the roller material 10 after lowering the temperature to about 50 ° C. to about room temperature. This temperature drop may be allowed to cool in the atmosphere, may be slowly cooled in the heating device, or may be cooled using a cooling device in order to shorten the processing time.

次に、本発明の別の実施形態について説明する。本実施形態は、図１（ａ）〜（ｆ）を用いて説明した上記実施形態の要件を全て含み、かつ、図７に示すように、加熱工程の前にローラ材１０のシャフト１１の少なくとも一端を保持部材ｈにより保持し、この保持した状態でローラ材１０を円筒状成形具ｍと共に加熱する。保持部材ｈは、円筒状成形具ｍと同心でシャフト１１を挿通可能な貫通孔（図に表れず）を有しており、この保持部材ｈを円筒状成形具の少なくとも一端に、より好ましくは両端に、円筒状成形具ｍと同心に取り付け、このシャフト１１の貫通孔にシャフト１１の一端を挿入させて保持する。保持部材ｈの材料は、特に限定されず、耐熱性のある樹脂や金属を用いることができる。保持部材ｈの取り付けは、加熱前であれば、ローラ材１０を円筒状成形具ｍ内に挿入するとき（図１（ｂ）参照）でもよいし、シャフト１１を挿入方向とは逆方向に移動させるとき（図１（ｃ）参照）でもよいし、加熱直前（図１（ｄ））でもよい。   Next, another embodiment of the present invention will be described. This embodiment includes all the requirements of the above-described embodiment described with reference to FIGS. 1A to 1F, and as shown in FIG. 7, at least the shaft 11 of the roller material 10 before the heating step is included. One end is held by the holding member h, and the roller material 10 is heated together with the cylindrical forming tool m in this held state. The holding member h has a through-hole (not shown in the figure) that is concentric with the cylindrical forming tool m and allows the shaft 11 to be inserted. More preferably, the holding member h is at least one end of the cylindrical forming tool. At both ends, it is attached concentrically with the cylindrical forming tool m, and one end of the shaft 11 is inserted into the through hole of the shaft 11 and held. The material of the holding member h is not particularly limited, and heat-resistant resin or metal can be used. The holding member h may be attached when the roller material 10 is inserted into the cylindrical forming tool m (see FIG. 1B), or the shaft 11 is moved in the direction opposite to the insertion direction, if it is before heating. (See FIG. 1C) or just before heating (FIG. 1D).

保持部材ｈによりシャフト１１の少なくとも一端を保持することより、シャフト１１を円筒状成形具ｍの内径中心に位置させ、その位置で固定することができる。したがって、ローラ材１０を円筒状成形具ｍ内に挿入するときに（図１（ｂ）参照）、シャフト１１が円筒状成形具の内径中心に位置していなかった場合でも、保持部材ｈを用いることにより、シャフト１１が円筒状成形具の内径中心に位置させることができる。つまり、保持部材ｈにより、円筒状成形具ｍとシャフト１１との位置決めをすることができる。更に、保持部材ｈを円筒状成形具ｍの両端に取り付けることにより、シャフト１１の軸方向の位置決めもすることができる。   By holding at least one end of the shaft 11 by the holding member h, the shaft 11 can be positioned at the center of the inner diameter of the cylindrical forming tool m and fixed at that position. Therefore, when the roller material 10 is inserted into the cylindrical forming tool m (see FIG. 1B), the holding member h is used even when the shaft 11 is not positioned at the center of the inner diameter of the cylindrical forming tool. Thus, the shaft 11 can be positioned at the center of the inner diameter of the cylindrical forming tool. In other words, the cylindrical molding tool m and the shaft 11 can be positioned by the holding member h. Furthermore, the shaft 11 can be positioned in the axial direction by attaching the holding member h to both ends of the cylindrical forming tool m.

また、シャフト１１を挿入方向とは逆方向に移動させるときに、保持部材ｈを用いることにより、シャフト軸方向に生じる歪の大きさが、シャフトの周方向で変動することがないので、弾性層の歪の解消を、弾性層の全体にわたって均質に行うことができ、より均質な弾性層を有するＯＡローラを得ることができる。更に、加熱時に保持部材ｈを用いてシャフト１１を保持することにより、その後に得られたＯＡローラは、シャフト１１が弾性層１２の回転中心に位置している。したがって、ＯＡローラ使用時に弾性層厚さの変動がなく、良好な画像形成特性が得られる。   Further, when the shaft 11 is moved in the direction opposite to the insertion direction, the use of the holding member h prevents the magnitude of strain generated in the shaft axial direction from fluctuating in the circumferential direction of the shaft. This strain can be uniformly removed over the entire elastic layer, and an OA roller having a more uniform elastic layer can be obtained. Furthermore, the shaft 11 is positioned at the center of rotation of the elastic layer 12 in the OA roller obtained by holding the shaft 11 using the holding member h during heating. Therefore, there is no fluctuation of the elastic layer thickness when using the OA roller, and good image forming characteristics can be obtained.

本発明の実施形態のＯＡローラは、本発明の実施形態の製造方法により得られたローラである（図１（ｆ）参照）。シャフト１１と、このシャフト１１の外周に形成された樹脂発泡体よりなる円柱形状の弾性層２と、を備え、この弾性層２の表面近傍の樹脂発泡体のセルがローラの径方向に圧縮変形され、シャフト１１の軸方向の歪が除去された形状を有している。樹脂発泡体のセルがローラの径方向に圧縮変形されているから、弾性層２の表面は平滑で、かつ表面のセル密度（表面から１ｍｍの部分で測定）が、内部のセル密度よりも大きい（例えば１．０５倍〜３．００倍）。また、円筒状成形具ｍと共に加熱されることから、弾性層２の表面のケバ立ちが抑制されている。更に、樹脂発泡体のセルは、シャフト１１の軸方向の歪が除去されているため、トナー等を安定供給、搬送することができ、トナー等の詰まりを抑制することができ、良好で均質な画像形成特性を得ることができる。なお、本発明のＯＡローラの用途は、トナー供給ローラに限られず、転写ローラやクリーニングローラ等の各種のローラにも用いることができる。   The OA roller according to the embodiment of the present invention is a roller obtained by the manufacturing method according to the embodiment of the present invention (see FIG. 1 (f)). A shaft 11 and a cylindrical elastic layer 2 made of a resin foam formed on the outer periphery of the shaft 11 are provided, and a cell of the resin foam near the surface of the elastic layer 2 is compressed and deformed in the radial direction of the roller. Thus, the shaft 11 has a shape in which the axial distortion is removed. Since the cell of the resin foam is compressed and deformed in the radial direction of the roller, the surface of the elastic layer 2 is smooth and the cell density on the surface (measured at 1 mm from the surface) is larger than the internal cell density. (For example, 1.05 times to 3.00 times). Moreover, since it heats with the cylindrical shaping | molding tool m, the flaking of the surface of the elastic layer 2 is suppressed. Further, since the resin foam cell is free from distortion in the axial direction of the shaft 11, it can stably supply and transport toner and the like, and can suppress clogging of toner and the like. Image forming characteristics can be obtained. The use of the OA roller of the present invention is not limited to the toner supply roller, and can be used for various rollers such as a transfer roller and a cleaning roller.

本発明のＯＡローラの製造方法及びＯＡローラは、上述した実施の形態及び後述する実施例に基づき、本発明の趣旨を逸脱しない範囲内で幾多の変形が可能である。例えば、本発明における弾性層に好適な材料は、特に限定されないが、例えば、ポリエチレン、ポリ塩化ビニル、ポリスチレン、ポリビニルアルコール、ビスコース、アイオノマー等の熱可塑性フォーム又はウレタン、ラバーフォーム、エポキシ、フェノールユリア、ピラニル、シリコーン、アクリル等の熱硬化性フォームが挙げられるが、特にウレタンが好ましい。また、弾性層のセル形態は、単泡、連泡等の何れの形態でも使用可能だが、連泡の方が温度による寸法変化が少ないので好ましい。   The OA roller manufacturing method and the OA roller of the present invention can be modified in various ways within the scope of the present invention based on the above-described embodiment and examples described later. For example, a material suitable for the elastic layer in the present invention is not particularly limited. For example, thermoplastic foam such as polyethylene, polyvinyl chloride, polystyrene, polyvinyl alcohol, viscose, ionomer, or urethane, rubber foam, epoxy, phenol urea. And thermosetting foams such as pyranyl, silicone, and acrylic, and urethane is particularly preferable. The cell form of the elastic layer can be used in any form such as single foam, open foam, etc., however, open foam is preferable because the dimensional change due to temperature is small.

また、弾性層の材料がウレタンである場合、ポリオールとしては、特に限定されず、疎水性及び親水性のいかなるポリオールでも使用できる。イソシアネートとしては、特に限定されず、公知のものが使用できる。   Moreover, when the material of the elastic layer is urethane, the polyol is not particularly limited, and any hydrophobic or hydrophilic polyol can be used. It does not specifically limit as isocyanate, A well-known thing can be used.

弾性層は、導電性を有する材料からなる構成とすることもできる。導電性を付与するための導電性材料としては、まず粉体として例示すれば、ケッチェンブラックＥＣ、アセチレンブラック等の導電性カーボン、ＳＡＦ、ＩＳＡＦ、ＨＡＦ、ＦＥＦ、ＧＰＦ、ＳＲＦ、ＦＴ、ＭＴ等のゴム用カーボン、酸化処理等を施したカラー（インク）用カーボン、熱分解カーボン、天然グラファイト、人造グラファイト、アンチモンドープの酸化錫、酸化チタン、酸化亜鉛、ニッケル、銅、銀、ゲルマニウム等の金属及び金属酸化物、ポリアニリン、ポリピロール、ポリアセチレン等の導電性ポリマー等が挙げられる。この中で、価格が安く、少量で導電性を制御し易いものは、カーボンブラックである。通常は、これらの導電性材料の配合量は、ウレタン１００重量部に対して０．５〜５０重量部、特に１〜３０重量部の範囲で好適に用いられる。   The elastic layer can also be made of a conductive material. Examples of conductive materials for imparting conductivity include conductive carbon such as ketjen black EC and acetylene black, SAF, ISAF, HAF, FEF, GPF, SRF, FT, MT, etc. Carbon for rubber, carbon for color (ink) subjected to oxidation treatment, pyrolytic carbon, natural graphite, artificial graphite, antimony-doped tin oxide, titanium oxide, zinc oxide, nickel, copper, silver, germanium, etc. And conductive polymers such as metal oxides, polyaniline, polypyrrole, and polyacetylene. Among these, carbon black is inexpensive and easy to control conductivity with a small amount. Usually, the compounding amount of these conductive materials is suitably used in the range of 0.5 to 50 parts by weight, particularly 1 to 30 parts by weight with respect to 100 parts by weight of urethane.

イオン導電性物質を例示すれば、過塩素酸ナトリウム、過塩素酸リチウム、過塩素酸カルシウム、塩化リチウム等の無機イオン性導電物質、更にトリデシルメチルジヒドロキシエチルアンモニウムパークロレート、ラウリルトリメチルアンモニウムパークロレート、変性脂肪族・ジメチルエチルアンモニウムエトサルフェート、Ｎ，Ｎ−ビス（２−ヒドロキシエチル）−Ｎ−（３′−ドデシロキシ−２′−ヒドロキシプロピル）メチルアンモニウムエトサルフェート、３−ラウルアミドプロピル−トエイメチルアンモニウムメチルサルフェート、ステアルアミドプロピルジメチル−β−ヒドロキシエチル−アンモニウム−ジハイドロジェンフォスフェート、テトラブチルアンモニウムホウフッ酸塩、ステアリルアンモニウムアセテート、ラウリルアンモニウムアセテート等の第４級アンモニウムの過塩素酸塩、硫酸塩、エトサルフェート塩、メチルサルフェート塩、リン酸塩、ホウフッ化水素酸塩、アセテート等の有機イオン性導電物質或は電荷移動錯体が例示される。通常は、これらの導電性材料の配合量は、ウレタン１００重量部に対して０．０００１〜５０重量部の範囲で好適に用いられる。   Examples of ionic conductive substances include inorganic ionic conductive substances such as sodium perchlorate, lithium perchlorate, calcium perchlorate, lithium chloride, tridecylmethyldihydroxyethylammonium perchlorate, lauryltrimethylammonium perchlorate, Modified Aliphatic Dimethylethylammonium Ethosulphate, N, N-Bis (2-hydroxyethyl) -N- (3′-dodecyloxy-2′-hydroxypropyl) methylammonium etosulphate, 3-Lauramidopropyl-Toeimethylammonium Methyl sulfate, stearamidopropyldimethyl-β-hydroxyethyl-ammonium dihydrogen phosphate, tetrabutylammonium borofluoride, stearylammonium acetate, laur Organic ionic conductive materials or charge transfer complexes such as quaternary ammonium perchlorates such as ruammonium acetate, sulfate, ethosulphate, methyl sulfate, phosphate, borofluoride, acetate Illustrated. Usually, the blending amount of these conductive materials is suitably used in the range of 0.0001 to 50 parts by weight with respect to 100 parts by weight of urethane.

（実施例１〜３）
金属製の中実形状のシャフト（長さ２５０ｍｍ、直径６ｍｍ）の外周に、樹脂発泡体としてウレタンフォームよりなる弾性層を、外径１５ｍｍ、長さ２２０ｍｍの円柱形状に取り付け固定してなるローラ材を用意した。この弾性層のウレタンフォームは、材質がエステル系、平均セル径が２７０μｍ、硬度が８０Ａｓｋ−Ｆであった。(Examples 1-3)
Roller material in which an elastic layer made of urethane foam as a resin foam is attached and fixed to a cylindrical shape with an outer diameter of 15 mm and a length of 220 mm on the outer periphery of a metal solid shaft (length: 250 mm, diameter: 6 mm) Prepared. The urethane foam of this elastic layer was made of ester, the average cell diameter was 270 μm, and the hardness was 80 Ask-F.

また、円筒状成形具として金属パイプ（ＳＵＳ３０４、内径１４．１ｍｍ、厚さ１．５ｍｍ）を用意した。この金属パイプの一端から上記のローラ材を金属パイプ内に挿入した。ローラ材の弾性層の圧縮率は１１％であった。   Moreover, a metal pipe (SUS304, inner diameter 14.1 mm, thickness 1.5 mm) was prepared as a cylindrical forming tool. The roller material was inserted into the metal pipe from one end of the metal pipe. The compression ratio of the elastic layer of the roller material was 11%.

次に、金属パイプに挿入されたローラ材のシャフトを、上記挿入の方向とは逆方向に移動させた。この移動量は、比較例１として移動量が０ｍｍの場合に円筒状成形具内のローラ材の弾性層に生じたシャフト軸方向の歪み量である２．０ｍｍに基づいて、実施例１では２ｍｍ、実施例２では４ｍｍ、実施例３では１０ｍｍとした。   Next, the shaft of the roller material inserted into the metal pipe was moved in the direction opposite to the insertion direction. This amount of movement is 2 mm in Example 1 based on 2.0 mm which is the amount of distortion in the axial direction of the shaft generated in the elastic layer of the roller material in the cylindrical molding tool when the amount of movement is 0 mm as Comparative Example 1. In Example 2, the thickness was 4 mm, and in Example 3, the thickness was 10 mm.

これらの実施例１〜３及び比較例１のローラ材が挿入された金属パイプの両端に、図７に示した保持部材を取りつけることにより、これらのローラ材のシャフトの両端が保持部材で保持された状態で、実施例１〜３及び比較例１の各ローラ材を金属パイプと共に、加熱装置により１５０℃、６０分加熱した。加熱後は常温まで降温させてから、ローラ材を金属パイプから取り外した。   By attaching the holding members shown in FIG. 7 to both ends of the metal pipe into which the roller materials of Examples 1 to 3 and Comparative Example 1 are inserted, both ends of the shafts of these roller materials are held by the holding members. In this state, each roller material of Examples 1 to 3 and Comparative Example 1 was heated together with the metal pipe by a heating device at 150 ° C. for 60 minutes. After heating, the temperature was lowered to room temperature, and then the roller material was removed from the metal pipe.

かくして得られた実施例１〜３及び比較例１のＯＡローラは、外径が１４ｍｍであった。これらのＯＡローラの弾性層におけるシャフト軸方向の歪量及びセルの歪を測定し、また、セルの歪を評価した。その結果を表１に示す。なお、表１において、セルの歪については、弾性層の表面からシャフトに向かう半径方向断面におけるセル形状を顕微鏡により観察して、セルの歪が見られない場合を○印、セル径の長辺と短辺の比が２以下の歪が見られる場合を△印、セル径の長辺と短辺の比が２を超える歪が見られる場合を×印で評価した。   The OA rollers of Examples 1 to 3 and Comparative Example 1 thus obtained had an outer diameter of 14 mm. The strain amount in the axial direction of the shaft and the strain of the cell in the elastic layer of these OA rollers were measured, and the strain of the cell was evaluated. The results are shown in Table 1. In Table 1, regarding the cell strain, the cell shape in the radial cross section from the surface of the elastic layer toward the shaft is observed with a microscope. The case where a strain with a ratio of the short side of 2 or less was observed was evaluated by Δ, and the case of a strain with a ratio of the long side to the short side of the cell diameter exceeding 2 was evaluated by a mark x.

Figure 0005638626
Figure 0005638626

表１から、ＯＡローラの製造過程で金属パイプ内に挿入されたローラ材のシャフトを、挿入の方向とは逆方向に移動させなかった比較例１は、ＯＡローラの弾性層のシャフト軸方向の歪量（平均値）が２．０ｍｍであり、セルの歪については×印の評価であったのに対して、金属パイプ内に挿入されたローラ材のシャフトを、挿入の方向とは逆方向にそれぞれ２ｍｍ、４ｍｍ及び１０ｍｍ移動させた実施例１、２及び３は、比較例１に比べてシャフト軸方向の歪量が小さく、かつ、セルの歪も小さかった。なお、表１において、実施例３のシャフト軸方向の歪量がマイナスの値になっているのは、挿入の方向とは逆方向の移動量が大きかったために、挿入時の向きとは逆向きに歪が導入されたことを示している。もっとも、この実施例３の逆向きに導入された歪の量は、比較例１の歪の量よりも小さかった。実施例１〜３のなかでは、比較例１のシャフト軸方向の歪量と同じ又は近似した移動量とした実施例１及び実施例２が、実施例３に比べてシャフト軸方向の歪量が小さく、かつ、セルの歪も小さかった。   From Table 1, Comparative Example 1 in which the shaft of the roller material inserted into the metal pipe in the manufacturing process of the OA roller was not moved in the direction opposite to the direction of insertion was obtained in the shaft axial direction of the elastic layer of the OA roller. The strain amount (average value) was 2.0 mm, and the cell strain was evaluated as x, whereas the roller material shaft inserted in the metal pipe was in the direction opposite to the insertion direction. In Examples 1, 2 and 3, which were moved by 2 mm, 4 mm and 10 mm respectively, the strain amount in the shaft axial direction was smaller than that of Comparative Example 1, and the strain of the cell was also smaller. In Table 1, the amount of strain in the shaft axis direction of Example 3 has a negative value because the amount of movement in the direction opposite to the direction of insertion is large, which is opposite to the direction at the time of insertion. Shows that distortion has been introduced. However, the amount of strain introduced in the reverse direction of Example 3 was smaller than that of Comparative Example 1. Among Examples 1 to 3, Example 1 and Example 2 having the same or approximate amount of movement as the amount of strain in the shaft axial direction of Comparative Example 1 have a larger amount of distortion in the shaft axial direction than Example 3. The cell distortion was also small.

（実施例４及び比較例２）
ローラ材の弾性体の外径を１８ｍｍとした以外は実施例１及び比較例１と同じ寸法、材料のローラ材を用意した。また、円筒状成形具として実施例１及び比較例１と同じ寸法、材料の金属パイプを用意した。この金属パイプの一端から上記のローラ材を金属パイプ内に挿入した。ローラ材の弾性層の圧縮率は３３％であった。
次に、金属パイプ内に挿入されたローラ材のシャフトを、上記挿入の方向とは逆方向に移動させた。実施例４の移動量は、比較例２として移動量が０ｍｍの場合に円筒状成形具内のローラ材の弾性層に生じたシャフト軸方向の歪み量である２．７ｍｍに基づいて、３ｍｍとした。
これらの実施例４及び比較例２の各ローラ材を、実施例１と同様に保持部材により保持された状態で、実施例１と同じ加熱条件で加熱した。加熱後は実施例１と同様に常温まで降温させてから、ローラ材を金属パイプから取り外した。(Example 4 and Comparative Example 2)
A roller material having the same dimensions and materials as those of Example 1 and Comparative Example 1 was prepared except that the outer diameter of the elastic body of the roller material was 18 mm. Moreover, the metal pipe of the same dimension and material as Example 1 and Comparative Example 1 was prepared as a cylindrical shaping | molding tool. The roller material was inserted into the metal pipe from one end of the metal pipe. The compression ratio of the elastic layer of the roller material was 33%.
Next, the shaft of the roller material inserted into the metal pipe was moved in the direction opposite to the insertion direction. The amount of movement in Example 4 is 3 mm based on 2.7 mm, which is the amount of distortion in the shaft axis direction generated in the elastic layer of the roller material in the cylindrical molding tool when the amount of movement is 0 mm as Comparative Example 2. did.
Each roller material of Example 4 and Comparative Example 2 was heated under the same heating conditions as in Example 1 while being held by the holding member in the same manner as in Example 1. After heating, the temperature was lowered to room temperature as in Example 1, and then the roller material was removed from the metal pipe.

かくして得られた実施例４及び比較例２のＯＡローラは、外径が１４ｍｍであった。これらのＯＡローラの弾性層におけるシャフト軸方向の歪量及びセルの歪を測定し、また、セルの歪を評価した。その結果を表１に併記した。
表１から、ＯＡローラの製造過程で金属パイプ内に挿入されたローラ材のシャフトを、挿入の方向とは逆方向に移動させなかった比較例２は、ＯＡローラの弾性層のシャフト軸方向の歪量（平均値）が２．７ｍｍであり、セルの歪については×印の評価であったのに対して、金属パイプ内に挿入されたローラ材のシャフトを、挿入の方向とは逆方向に比較例２のシャフト軸方向の歪量と同程度に移動させた実施例４は、比較例２に比べてシャフト軸方向の歪量が小さく、かつ、セルの歪も小さかった。The OA rollers of Example 4 and Comparative Example 2 thus obtained had an outer diameter of 14 mm. The strain amount in the axial direction of the shaft and the strain of the cell in the elastic layer of these OA rollers were measured, and the strain of the cell was evaluated. The results are also shown in Table 1.
From Table 1, Comparative Example 2 in which the shaft of the roller material inserted into the metal pipe in the manufacturing process of the OA roller was not moved in the direction opposite to the direction of insertion was obtained in the shaft axial direction of the elastic layer of the OA roller. The strain amount (average value) was 2.7 mm, and the cell strain was evaluated as “x”, whereas the shaft of the roller material inserted into the metal pipe was reverse to the insertion direction. In Example 4, which was moved to the same extent as the amount of strain in the shaft axis direction of Comparative Example 2, the amount of strain in the shaft axis direction was smaller than that of Comparative Example 2, and the strain of the cell was also small.

（実施例５及び比較例３）
弾性層のウレタンフォームを、材質がエステル系、平均セル径が５４０μｍ、硬度が５０Ａｓｋ−Ｆのものを用いたこと以外は、実施例１及び比較例１と同じローラ材を用意した。また、円筒状成形具として実施例１及び比較例１と同じ寸法、材料の金属パイプを用意した。この金属パイプの一端から上記のローラ材を金属パイプ内に挿入した。ローラ材の弾性層の圧縮率は、実施例１と同様に１１％であった。
次に、金属パイプ内に挿入されたローラ材のシャフトを、上記挿入の方向とは逆方向に移動させた。この実施例５の移動量は、比較例３として移動量が０ｍｍの場合に円筒状成形具内のローラ材の弾性層に生じたシャフト軸方向の歪み量である３．０ｍｍに基づいて、３ｍｍとした。
これらの実施例５及び比較例３の各ローラ材を、実施例１と同様に保持部材により保持された状態で、実施例１と同じ加熱条件で加熱した。加熱後は実施例１と同様に常温まで降温させてから、ローラ材を金属パイプから取り外した。(Example 5 and Comparative Example 3)
The same roller material as in Example 1 and Comparative Example 1 was prepared except that the urethane foam of the elastic layer was of an ester type, the average cell diameter was 540 μm, and the hardness was 50 Ask-F. Moreover, the metal pipe of the same dimension and material as Example 1 and Comparative Example 1 was prepared as a cylindrical shaping | molding tool. The roller material was inserted into the metal pipe from one end of the metal pipe. The compression rate of the elastic layer of the roller material was 11% as in Example 1.
Next, the shaft of the roller material inserted into the metal pipe was moved in the direction opposite to the insertion direction. The amount of movement in Example 5 is 3 mm based on 3.0 mm which is the amount of distortion in the shaft axial direction generated in the elastic layer of the roller material in the cylindrical molding tool when the amount of movement is 0 mm as Comparative Example 3. It was.
These roller materials of Example 5 and Comparative Example 3 were heated under the same heating conditions as in Example 1 while being held by the holding member in the same manner as in Example 1. After heating, the temperature was lowered to room temperature as in Example 1, and then the roller material was removed from the metal pipe.

かくして得られた実施例５及び比較例３のＯＡローラは、外径が１４ｍｍであった。これらのＯＡローラの弾性層におけるシャフト軸方向の歪量及びセルの歪を測定し、また、セルの歪を評価した。その結果を表１に併記した。
表１から、ＯＡローラの製造過程で金属パイプ内に挿入されたローラ材のシャフトを、挿入の方向とは逆方向に移動させなかった比較例３は、ＯＡローラの弾性層のシャフト軸方向の歪量（平均値）が３．０ｍｍであり、セルの歪については×印の評価であったのに対して、金属パイプ内に挿入されたローラ材のシャフトを、挿入の方向とは逆方向に比較例３のシャフト軸方向の歪量と同じ量で移動させた実施例４は、比較例３に比べてシャフト軸方向の歪量が小さく、かつ、セルの歪も小さかった。The OA rollers of Example 5 and Comparative Example 3 thus obtained had an outer diameter of 14 mm. The strain amount in the axial direction of the shaft and the strain of the cell in the elastic layer of these OA rollers were measured, and the strain of the cell was evaluated. The results are also shown in Table 1.
From Table 1, Comparative Example 3 in which the shaft of the roller material inserted into the metal pipe in the manufacturing process of the OA roller was not moved in the direction opposite to the direction of insertion was obtained in the axial direction of the elastic layer of the OA roller. The strain amount (average value) was 3.0 mm, and the cell strain was evaluated as x. On the other hand, the shaft of the roller material inserted in the metal pipe was opposite to the insertion direction. In Example 4, which was moved by the same amount as the amount of strain in the shaft axis direction of Comparative Example 3, the amount of strain in the shaft axis direction was smaller than that of Comparative Example 3, and the strain of the cell was also small.

（実施例６）
加熱前に、保持部材を用いてローラ材の両端部を保持しなかった以外は実施例１同様にしてＯＡローラを作製した。得られたＯＡローラの軸振れを、レーザー寸法測定器を用いて測定した。その結果を図８に実施例１との対比でグラフに示す。
保持部材を用いた実施例１に比べて、保持部材を用いなかった実施例６は、軸の振れが大きかった。また光学顕微鏡によるウレタンフォームのセルの観察によりシャフト軸方向の歪量は、０．５ｍｍであり、実施例１よりも多かったが、上述の比較例１よりも少なかった。(Example 6)
An OA roller was produced in the same manner as in Example 1 except that the holding member was not used to hold both ends of the roller material before heating. The shaft runout of the obtained OA roller was measured using a laser size measuring instrument. The results are shown in a graph in FIG. 8 in comparison with Example 1.
Compared to Example 1 using the holding member, Example 6 that did not use the holding member had a large shaft runout. Further, the amount of strain in the shaft axial direction was 0.5 mm as a result of observing urethane foam cells with an optical microscope, which was larger than that in Example 1, but smaller than that in Comparative Example 1 described above.

（実施例７）
加熱後に、降温過程の１４０℃の時に、ローラ材を円筒状成形具から取り外した以外は実施例１と同様にしてＯＡローラを製造した。得られたＯＡローラの外径を実施例１との対比で図９にグラフで示す。
実施例７のＯＡローラは、円筒状成形具から取り外した後にローラの弾性層で測定される外径が実施例１よりも増大していた。(Example 7)
After heating, an OA roller was produced in the same manner as in Example 1 except that the roller material was removed from the cylindrical molding tool at 140 ° C. in the temperature lowering process. The outer diameter of the obtained OA roller is shown as a graph in FIG.
The outer diameter measured by the elastic layer of the roller after the OA roller of Example 7 was removed from the cylindrical forming tool was larger than that of Example 1.

１ ＯＡローラ
２ 弾性層
１０ ローラ材
１１ シャフト
１２ 弾性層
ｍ 円筒状成形具
ｔ 加熱装置
ｈ 保持部材DESCRIPTION OF SYMBOLS 1 OA roller 2 Elastic layer 10 Roller material 11 Shaft 12 Elastic layer m Cylindrical forming tool t Heating device h Holding member

Claims (5)

シャフトと、このシャフトの外周に形成された樹脂発泡体よりなる円柱形状の弾性層と、を有し、この弾性層が最終の外径よりも大きな外径を有しているローラ材を用意する工程と、
このローラ材の弾性層の外径よりも小さな内径を有する円筒状成形具内に、ローラ材の弾性層を圧縮させながら当該ローラ材を挿入する工程と、
この円筒状成形具内のローラ材の弾性層に生じたシャフト軸方向の歪を除去するようにシャフトを挿入方向とは逆方向に移動させる工程と、
ローラ材を円筒状成形具と共に加熱する工程と、
加熱後のローラ材を円筒状成形具から取り外すことで最終の外径の弾性層を有するローラを得る工程と
を備えることを特徴とするＯＡローラの製造方法。A roller material having a shaft and a cylindrical elastic layer made of a resin foam formed on the outer periphery of the shaft, the elastic layer having an outer diameter larger than the final outer diameter is prepared. Process,
Inserting the roller material into the cylindrical molding tool having an inner diameter smaller than the outer diameter of the elastic layer of the roller material while compressing the elastic layer of the roller material;
A step of moving the shaft in the direction opposite to the insertion direction so as to remove the distortion in the shaft axial direction generated in the elastic layer of the roller material in the cylindrical molding tool;
Heating the roller material together with the cylindrical forming tool;
And a step of obtaining a roller having an elastic layer having a final outer diameter by removing the heated roller material from the cylindrical forming tool. 前記シャフトを挿入方向とは逆方向に移動させる工程は、ローラ材のシャフトを、円筒状成形具内のローラ材の弾性層に生じたシャフト軸方向の歪み量で定められる量で移動させることを特徴とする請求項１記載のＯＡローラの製造方法。   The step of moving the shaft in the direction opposite to the insertion direction is to move the shaft of the roller material by an amount determined by the amount of strain in the axial direction of the shaft generated in the elastic layer of the roller material in the cylindrical forming tool. The method for manufacturing an OA roller according to claim 1. 前記樹脂発泡体が、ウレタンフォームであることを特徴とする請求項１又は２記載のＯＡローラの製造方法。   The OA roller manufacturing method according to claim 1, wherein the resin foam is urethane foam. 前記加熱する工程の際に、ローラ材のシャフトの少なくとも一端を保持部材により保持することを特徴とする請求項１〜３記載のＯＡローラの製造方法。   The method for manufacturing an OA roller according to claim 1, wherein at least one end of the shaft of the roller material is held by a holding member during the heating step. 請求項１〜４のいずれか１項に記載の製造方法により製造されるＯＡローラであって、
シャフトと、このシャフトの外周に形成された樹脂発泡体よりなる円柱形状の弾性層と、を備え、この弾性層の表面近傍の樹脂発泡体のセルがローラの径方向に圧縮変形され、シャフトの軸方向の歪が除去された形状を有することを特徴とするＯＡローラ。An OA roller manufactured by the manufacturing method according to any one of claims 1 to 4,
A cylindrical elastic layer made of a resin foam formed on the outer periphery of the shaft, and a cell of the resin foam in the vicinity of the surface of the elastic layer is compressed and deformed in the radial direction of the roller. An OA roller having a shape from which axial strain is removed.
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