JP2011227512A - Fixing member, method for manufacturing fixing member, fixing rotating body, fixing device, and image forming apparatus - Google Patents

Fixing member, method for manufacturing fixing member, fixing rotating body, fixing device, and image forming apparatus Download PDF

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JP2011227512A
JP2011227512A JP2011141428A JP2011141428A JP2011227512A JP 2011227512 A JP2011227512 A JP 2011227512A JP 2011141428 A JP2011141428 A JP 2011141428A JP 2011141428 A JP2011141428 A JP 2011141428A JP 2011227512 A JP2011227512 A JP 2011227512A
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fixing
fixing member
recording medium
carbon fiber
toner
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JP2011227512A5 (en
JP5061255B2 (en
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Tomoaki Sugawara
智明 菅原
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Ricoh Co Ltd
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Ricoh Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a fixing member which is capable of starting up a fixing device of an image forming apparatus at high speed and has a low heat capacity (low density), high heat conductivity, and low rubber hardness, a method for manufacturing the fixing member, a fixing rotating body, the fixing device, and the image forming apparatus.SOLUTION: The fixing member constitutes the fixing rotating body which incorporates a heat source and conveys a recording medium carrying unfixed toner to a nip part between the fixing rotating body and a pressure part coming into press-contact with the fixing rotating body through the recording medium, to fix the unfixed toner on the recording medium. The fixing member is configured to include a hole part in a silicone rubber including a carbon fiber.

Description

本発明は定着部材、定着部材の製造方法、定着用回転体、定着装置及び画像形成装置に関し、詳細にはトナーの定着用回転体等を構成する熱伝導性弾性の定着部材に関する。   The present invention relates to a fixing member, a fixing member manufacturing method, a fixing rotator, a fixing device, and an image forming apparatus, and more particularly to a heat conductive elastic fixing member constituting a toner fixing rotator and the like.

従来、高画質を目的とする電子写真複写機、プリンタ、特にカラー電子写真による出力を行う装置においては、トナーへの柔軟な密着性確保、耐熱性のため定着部材としてシリコーンゴムを使用することが多い。しかし、これら耐熱性ゴム材料は熱伝導性が低く、熱源からの熱を被記録材に伝える際には熱抵抗層となる。カラー画像では、特に柔らかいゴム層が画質向上の点で、重要である。しかし、熱容量が大きく、熱抵抗が高いため立ち上がりの時間が遅くなる。また、高速機の場合にも熱供給が間に合わなくなる。そのため、特許文献1や特許文献2のように、フィラーを用いて熱伝導率を向上させる試みが行われている。   Conventionally, in an electrophotographic copying machine and a printer for the purpose of high image quality, particularly in an apparatus that performs output by color electrophotography, silicone rubber can be used as a fixing member to ensure flexible adhesion to toner and heat resistance. Many. However, these heat-resistant rubber materials have low thermal conductivity, and become a heat resistance layer when transferring heat from the heat source to the recording material. In color images, a soft rubber layer is particularly important for improving image quality. However, since the heat capacity is large and the thermal resistance is high, the rise time is delayed. In addition, even in the case of a high-speed machine, the heat supply is not in time. Therefore, as in Patent Document 1 and Patent Document 2, attempts have been made to improve thermal conductivity using a filler.

しかしながら、上記特許文献1、2によれば、定着部材の密度を低くできないので、低密度化によって低熱容量とし、立ち上がりの時間を短縮することはできない。   However, according to Patent Documents 1 and 2, since the density of the fixing member cannot be lowered, it is impossible to reduce the heat capacity by reducing the density and to shorten the rise time.

これには次の2つの理由がある。その一つ目の理由には発泡倍率を上げていくと、急激に熱伝導性が低下することがある。これは、元の物質の熱伝導性が変わらない場合に発生する(例えば、熱物性ハンドブック 養賢堂 C.2 p.179のEuckenの式参照)。そして、二つ目の理由には、発泡倍率を上げると相対的に定着部材の壁面が薄くなるため、強度が低下する。なお、上記発泡倍率とは、気泡がない状態の体積Vsを分母とし、気泡の体積VfとVsの和を分子としたものである。   There are two reasons for this. The first reason is that as the expansion ratio is increased, the thermal conductivity may rapidly decrease. This occurs when the thermal conductivity of the original material does not change (see, for example, the Eucken equation in the thermophysical handbook Yokendo C.2 p.179). The second reason is that when the expansion ratio is increased, the wall surface of the fixing member becomes relatively thin, so that the strength decreases. Note that the expansion ratio is obtained by using the volume Vs without bubbles as a denominator and the sum of the bubbles volume Vf and Vs as a numerator.

これらの2つの問題のため、高温環境下で変形を繰り返される定着部材において、低熱容量(低密度)であって、高熱伝導率及び耐熱性を併せ持つ定着部材を開発することは困難であった。   Due to these two problems, it has been difficult to develop a fixing member having a low heat capacity (low density) and having both high thermal conductivity and heat resistance in a fixing member that is repeatedly deformed in a high temperature environment.

本発明はこれらの問題点を解決するためのものであり、画像形成装置の定着装置の高速立ち上げが可能であって、低熱容量(低密度)と高熱伝導率、かつ低ゴム硬度の、定着部材、定着部材の製造方法、定着用回転体、定着装置及び画像形成装置を提供することを目的とする。   The present invention is for solving these problems, and can fix a fixing device of an image forming apparatus at high speed, and has a low heat capacity (low density), a high thermal conductivity, and a low rubber hardness. It is an object of the present invention to provide a member, a fixing member manufacturing method, a fixing rotator, a fixing device, and an image forming apparatus.

前記問題点を解決するために、本発明の定着部材は、熱源を内蔵する定着用回転体であって、該定着用回転体と、当該定着用回転体に記録媒体を介して圧接する加圧部とのニップ部に、未定着トナーを担持した記録媒体を搬送して未定着トナーを記録媒体に定着する定着用回転体を構成している。そして、本発明の定着部材は、炭素繊維を含むシリコーンゴム中に空孔部を含んで構成されることに特徴がある。よって、炭素繊維が熱伝導のパスとなり、炭素繊維が強く固定されていないためすべりにより容易に変形でき、シリコーンゴムへの応力集中による破壊がなく圧縮永久歪が低減できることにより、炭素繊維の剛直性と空孔間の気体の流れを向上させて、低熱容量(低密度)と高熱伝導率、かつ低ゴム硬度の定着部材を提供することができる。   In order to solve the above problems, the fixing member of the present invention is a fixing rotator incorporating a heat source, and the fixing rotator is pressed against the fixing rotator via a recording medium. A fixing rotator for conveying the recording medium carrying the unfixed toner to the nip portion to fix the unfixed toner on the recording medium is configured. The fixing member of the present invention is characterized in that it is configured to include pores in silicone rubber containing carbon fibers. Therefore, the carbon fiber becomes a path for heat conduction, and since the carbon fiber is not firmly fixed, it can be easily deformed by sliding, and the compression set can be reduced without breaking due to stress concentration on the silicone rubber. By improving the gas flow between the holes and the holes, it is possible to provide a fixing member having low heat capacity (low density), high thermal conductivity, and low rubber hardness.

また、シリコーンゴム中の炭素繊維が非接着部分を有することが好ましい。   Moreover, it is preferable that the carbon fiber in silicone rubber has a non-adhesive part.

更に、炭素繊維は、ピッチ系炭素繊維であることにより、必要な熱伝導率を確保できる。   Furthermore, the required thermal conductivity can be ensured because the carbon fiber is a pitch-based carbon fiber.

また、別の発明として、定着部材の製造方法によれば、未加硫付加型のシリコーンゴムに、発泡剤または発泡粒子を含有させ、さらに炭素繊維を含有させ、1次加硫及び発泡を行い、その後に2次加硫を行う。よって、簡便に材料を作製でき、かつ圧縮永久歪が低減できる。   As another invention, according to the fixing member manufacturing method, the unvulcanized addition type silicone rubber contains a foaming agent or foamed particles, and further contains carbon fiber to perform primary vulcanization and foaming. Then, secondary vulcanization is performed. Therefore, the material can be easily produced and the compression set can be reduced.

更に、別の発明として、定着部材の製造方法によれば、未加硫付加型のシリコーンゴムに、炭素繊維と既発泡粒子を含有させ1次加硫を行い、その後に2次加硫を行う。よって、簡便に材料を作製でき、かつ圧縮永久歪が低減できる。   As another invention, according to the method for producing a fixing member, primary vulcanization is performed by adding carbon fibers and already expanded particles to an unvulcanized addition type silicone rubber, and then secondary vulcanization is performed. . Therefore, the material can be easily produced and the compression set can be reduced.

また、炭素繊維は、ピッチ系炭素繊維であることにより、必要な熱伝導率を確保できる。   Further, the carbon fiber is pitch-based carbon fiber, so that necessary heat conductivity can be secured.

更に、定着部材の発泡倍率は1.5以上3.0以下とする。発泡倍率1.5倍より小さいと熱容量が大きいためニップを大きくするための厚さを確保できず、発泡倍率3.0倍を超えると壁面が極度に薄くなり、強度が低下し、圧縮永久歪が大きくなる。よって、定着部材の発泡倍率を1.5以上3.0以下とする範囲内においては低熱容量と強度が満たされ、十分な定着動作が可能となる。   Further, the expansion ratio of the fixing member is 1.5 or more and 3.0 or less. If the expansion ratio is less than 1.5 times, the heat capacity is large, so that the thickness for enlarging the nip cannot be secured. If the expansion ratio exceeds 3.0 times, the wall surface becomes extremely thin, the strength decreases, and the compression set Becomes larger. Therefore, the low heat capacity and the strength are satisfied within the range where the expansion ratio of the fixing member is 1.5 or more and 3.0 or less, and a sufficient fixing operation is possible.

また、別の発明としての定着用回転体は、上記定着部材、あるいは上記の定着部材の製造方法を用いて製造した定着部材を用いたことに特徴がある。更には、金属のローラ状の芯金を用い、該芯金の厚さが0.5mm以下0.25mm以上であって、芯金の内面に複数の周回凸部がローラ芯金に一体に形成されている。よって、ローラ中心のヒータから加熱されるのはまず芯金であるため、この熱容量も重要となる。0.5mm以下の厚さであれば、10数秒程度の立ち上げが可能となるが、たわみに対する強度が落ちるため周回凸部により補強されたものと組み合わされて速い立ち上げの定着装置を構成できる定着用回転を提供できる。   Further, another fixing invention is characterized in that the fixing member manufactured using the fixing member or the fixing member manufacturing method is used. Furthermore, a metal roller-shaped metal core is used, and the thickness of the metal core is 0.5 mm or less and 0.25 mm or more, and a plurality of circumferential protrusions are formed integrally with the roller metal core on the inner surface of the metal core. Has been. Therefore, since it is the core metal that is heated from the heater at the center of the roller, this heat capacity is also important. When the thickness is 0.5 mm or less, it is possible to start up for about several tens of seconds. However, since the strength against bending is reduced, a fixing device that can be quickly started up can be configured in combination with the one reinforced by the circumferential convex portion. Fixing rotation can be provided.

更に、最表面にフッ素系高分子よりなる層を有することにより、オイルレストナーであっても離型性のある耐久性のある誘導加熱装置に適用できる。   Furthermore, by having a layer made of a fluoropolymer on the outermost surface, even an oilless toner can be applied to a durable induction heating device having releasability.

また、表面の粗さ、十点平均高さRzが5μm以下であることにより、ベタ画像では定着部材の表面の凹凸にトナーがつきやすいため、表面がなめらかな定着用回転体により耐久性が向上する。   In addition, since the surface roughness and the ten-point average height Rz are 5 μm or less, toner tends to adhere to the unevenness of the surface of the fixing member in a solid image, so the durability is improved by a fixing rotating body with a smooth surface. To do.

更に、別の発明としての定着装置は、上記定着用回転体を用いたことに特徴がある。よって、熱伝導性のよい、ゴム硬度の低いローラにより熱伝達が均一に行われ、かつ膜強度の高い定着部材を用いることにより効率のよい耐久性の高い定着装置を提供できる。   Furthermore, a fixing device as another invention is characterized in that the fixing rotating body is used. Therefore, an efficient and highly durable fixing device can be provided by using a fixing member having high heat conductivity and heat transfer uniformly performed by a roller having low rubber hardness and having high film strength.

また、別の発明としての画像形成装置は、上記定着装置と、画像形成部とを備え、該画像形成部で記録媒体上にトナー像を形成し、定着装置で記録媒体にトナー像を定着させて画像を形成する。よって、熱伝導性のよい、ゴム硬度の低いローラにより熱伝達が均一に行われ、かつ膜強度の高い定着部材を用いることにより信頼性の高い、エネルギー効率のよい画像形成装置を提供できる。   According to another aspect of the present invention, an image forming apparatus includes the fixing device and an image forming unit. The image forming unit forms a toner image on a recording medium, and the fixing device fixes the toner image on the recording medium. To form an image. Therefore, it is possible to provide a highly reliable and energy efficient image forming apparatus by using a fixing member having high heat conductivity and heat transfer uniformly performed by a roller having low rubber hardness and having high film strength.

本発明の定着部材は炭素繊維を含むシリコーンゴム中に空孔部を含んで構成されている。よって、炭素繊維が熱伝導のパスとなり、炭素繊維が強く固定されていないためすべりにより容易に変形でき、シリコーンゴムへの応力集中による破壊がなく圧縮永久歪が低減できることにより、炭素繊維の剛直性と空孔間の気体の流れを向上させて、低熱容量(低密度)と高熱伝導率、かつ低ゴム硬度の定着部材を提供することができる。   The fixing member of the present invention is configured by including a hole in a silicone rubber containing carbon fiber. Therefore, the carbon fiber becomes a path for heat conduction, and since the carbon fiber is not firmly fixed, it can be easily deformed by sliding, and the compression set can be reduced without breaking due to stress concentration on the silicone rubber. By improving the gas flow between the holes and the holes, it is possible to provide a fixing member having low heat capacity (low density), high thermal conductivity, and low rubber hardness.

本発明の一実施の形態に係る定着部材の構成を示す部分断面図である。FIG. 3 is a partial cross-sectional view illustrating a configuration of a fixing member according to an embodiment of the present invention. 図1のシリコーンゴム層における連泡構造と炭素繊維の関係を示す拡大図である。It is an enlarged view which shows the relationship between the open cell structure and carbon fiber in the silicone rubber layer of FIG. 単泡構造のシリコーンゴム層を示す拡大図である。It is an enlarged view which shows the silicone rubber layer of a single bubble structure. 本発明の定着部材を用いた別の発明の定着装置の構成を示す概略断面図である。It is a schematic sectional drawing which shows the structure of the fixing apparatus of another invention using the fixing member of this invention. 本発明の定着装置を搭載した別の発明の画像形成装置の構成を示す概略断面図である。It is a schematic sectional drawing which shows the structure of the image forming apparatus of another invention carrying the fixing device of this invention. 定着ローラの構造を示す断面図である。FIG. 3 is a cross-sectional view illustrating a structure of a fixing roller. 熱処理しない炭素繊維を用いたもの切断面を示す断面図である。It is sectional drawing which shows the cut surface using the carbon fiber which is not heat-processed. 熱処理した炭素繊維を用いたものの切断面を示す断面図である。It is sectional drawing which shows the cut surface of what used the heat-treated carbon fiber.

図1は本発明の一実施の形態に係る定着部材の構成を示す部分断面図である。同図に示すように、本実施の形態の定着部材10は、金属ローラ11、シリコーンゴム層12及びPFA層13が積層されて構成されている。そして、シリコーンゴム層12には、図2に示すように、連泡部12−1を介して連泡化された、空孔部である気泡12−2と、炭素繊維12−3とが含有されている。このような積層構造の本実施の形態の定着部材10によれば、図1に示すように、熱源であるヒータ(図示せず)からの熱が金属ローラ11に伝わり、金属ローラ11からの熱はシリコーンゴム層12を経てPFA層13に伝わる。よって、このPFA層13がトナーと接触して熱を与えて定着させることができる。   FIG. 1 is a partial cross-sectional view showing a configuration of a fixing member according to an embodiment of the present invention. As shown in the figure, the fixing member 10 of the present embodiment is configured by laminating a metal roller 11, a silicone rubber layer 12, and a PFA layer 13. Then, as shown in FIG. 2, the silicone rubber layer 12 contains bubbles 12-2 that are pores and carbon fibers 12-3 that are made open through the open bubbles 12-1. Has been. According to the fixing member 10 of this embodiment having such a laminated structure, as shown in FIG. 1, heat from a heater (not shown) as a heat source is transmitted to the metal roller 11, and heat from the metal roller 11. Is transmitted to the PFA layer 13 through the silicone rubber layer 12. Therefore, the PFA layer 13 can be fixed by applying heat to the toner.

ここで、図2はシリコーンゴム層における連泡構造と炭素繊維の関係を示す拡大図である。なお、連泡部12−1とは、隣の気泡12−2と接続しているため変形の際に中の気体が流動できるものをいう。一方、図3は単泡構造のシリコーンゴム層を示す拡大図であり、後述する比較例7に相当する。同図に示すように単泡構造のシリコーンゴム層20は、図2に示す連泡部がない気泡21と炭素繊維22とを含んで構成されている。よって、空孔間の気体の移動ができず、炭素繊維の剛直性がシリコーンゴムの特性に影響する。ところで、炭素繊維としては、ピッチ系の日本グラファイトファイバー(株)社製品名:炭素繊維ミルド品番:XN−100−15M(150ミクロン)等が最適である。熱伝導率は、500W/mKとされている。これに対し、PAN系の熱伝導率は、最大で50W/mKである。炭素繊維と既発泡粒子を含み、更に硬化剤を含む未加硫付加型シリコーンゴムを、予め内面に接着層を形成したPFAチューブとその内側に0.5mmの内面に凸部補強(以下リブと称す)を設けた芯金をセットしその間に、注入液としてPFAチューブと芯金の間に注入する。次に、2次加熱で固定する。このとき既発泡剤が壊れ、かつ炭素繊維の周りがシリコーンゴムと離型する。この際、炭素繊維が効果的にシリコーンゴムと離型し、離型部分に空間を作製するために、グリセリン、エチレングリコール、ジエチレングリコール、トリエチレングリコール等を用いる。これらは、揮発効果により、空間を作製できる。同様に作製したシリコーン未架橋液をローラに塗布加硫し、フッ素樹脂のコート層を作製、またはフッ素樹脂チューブにより被覆することもできる。   Here, FIG. 2 is an enlarged view showing the relationship between the open cell structure and the carbon fiber in the silicone rubber layer. In addition, since the continuous bubble part 12-1 is connected with the adjacent bubble 12-2, it means what the inside gas can flow in the case of deformation. On the other hand, FIG. 3 is an enlarged view showing a silicone rubber layer having a single foam structure, and corresponds to Comparative Example 7 described later. As shown in the figure, the silicone rubber layer 20 having a single-bubble structure is configured to include bubbles 21 and carbon fibers 22 that do not have a continuous bubble portion shown in FIG. Therefore, gas cannot move between the holes, and the rigidity of the carbon fiber affects the properties of the silicone rubber. By the way, as a carbon fiber, Pitch-type Nippon Graphite Fiber Co., Ltd. product name: Carbon fiber milled product number: XN-100-15M (150 microns) is optimal. The thermal conductivity is 500 W / mK. On the other hand, the thermal conductivity of the PAN system is 50 W / mK at the maximum. An unvulcanized addition-type silicone rubber containing carbon fiber and already expanded particles and further containing a curing agent, a PFA tube having an adhesive layer formed on the inner surface in advance, and a convex reinforcement on the inner surface of 0.5 mm (hereinafter referred to as ribs) A metal core provided with a metal core is set, and an injection solution is injected between the PFA tube and the metal core. Next, it fixes by secondary heating. At this time, the foaming agent is broken, and the periphery of the carbon fiber is released from the silicone rubber. At this time, glycerin, ethylene glycol, diethylene glycol, triethylene glycol, or the like is used in order to effectively release the carbon fiber from the silicone rubber and create a space in the release portion. These can create a space by the volatilization effect. Similarly produced silicone uncrosslinked liquid can be applied to a roller and vulcanized to produce a fluororesin coat layer or coated with a fluororesin tube.

図4は本発明の定着部材を用いた別の発明の定着装置の構成を示す概略断面図である。同図に示す本発明の定着部材を用いた別の発明の定着装置1は、ローラ状の芯金14の内部にヒータ15が設けられ、芯金14の外周面には本発明の定着部材10が形成されている。このように形成された定着ローラと対向して加圧ローラ16が設けられ、この加圧ローラ16はバネなどの加圧機構17によって定着ローラ側に加圧されている。よって、未定着トナー像が形成された記録媒体が定着ローラと加圧ローラ16によって挟持、加圧されて記録媒体上の未定着トナーが定着される。   FIG. 4 is a schematic cross-sectional view showing a configuration of a fixing device of another invention using the fixing member of the present invention. In the fixing device 1 of another invention using the fixing member of the present invention shown in the same figure, a heater 15 is provided inside a roller-shaped metal core 14, and the fixing member 10 of the present invention is provided on the outer peripheral surface of the metal core 14. Is formed. A pressure roller 16 is provided so as to face the fixing roller formed as described above, and the pressure roller 16 is pressed toward the fixing roller by a pressure mechanism 17 such as a spring. Therefore, the recording medium on which the unfixed toner image is formed is sandwiched and pressed between the fixing roller and the pressure roller 16 to fix the unfixed toner on the recording medium.

図5は本発明の定着装置を搭載した別の発明の画像形成装置の構成を示す概略断面図である。同図に示す本発明の定着装置を搭載した別の発明の画像形成装置100によれば、感光体101の周りには、帯電器102、書込み装置103、現像器104、転写装置105、クリーニング装置106が配置されている。そして、感光体101は帯電器102によって例えば正極に帯電され、画像情報に基づく光情報が書込み装置103によって帯電された感光体101に書き込まれて可視潜像が形成される。次に、現像器104で攪拌帯電されたトナーによって可視潜像がトナー像となり、このトナー像は転写装置105によって記録媒体に転写される。そして、転写された記録媒体上の未定着トナーは、図4に示すように、定着装置1における定着ローラと加圧ローラとのニップ部に未定着トナーを担持した記録媒体が搬送されることによって未定着トナーは記録媒体に定着される。   FIG. 5 is a schematic cross-sectional view showing the configuration of an image forming apparatus according to another invention equipped with the fixing device according to the present invention. According to the image forming apparatus 100 of another invention in which the fixing device of the present invention shown in the figure is mounted, a charging device 102, a writing device 103, a developing device 104, a transfer device 105, and a cleaning device are disposed around the photosensitive member 101. 106 is arranged. The photosensitive member 101 is charged to, for example, a positive electrode by the charger 102, and optical information based on the image information is written on the photosensitive member 101 charged by the writing device 103 to form a visible latent image. Next, the visible latent image becomes a toner image by the toner stirred and charged by the developing device 104, and the toner image is transferred to a recording medium by the transfer device 105. As shown in FIG. 4, the unfixed toner on the transferred recording medium is transported by the recording medium carrying the unfixed toner to the nip portion between the fixing roller and the pressure roller in the fixing device 1. Unfixed toner is fixed on the recording medium.

ここで、本発明において用いられるフッ素樹脂としては、焼成による溶融成膜性のよい、比較的融点の低いもの(好ましくは250〜300℃)が好ましく選択される。具体的には、低分子量ポリテトラフルオロエチレン(PTFE)、テトラフロオロエチレン−ヘキサフルオロプロピレン共重合体(FEP)、テトラフルオロエチレン−パーフルオロアアルキアルビニルエーテル共重合体(PFA)の微粉末が挙げられる。低分子量ポリテトラフルオロエチレン(PTFE)粉末は、ルブロンL−5、L−2(ダイキン工業)、MP1100、1200、1300、TLP−10F−1(三井デュポンフロロケミカル)が知られている。テトラフルオロエチレン−ヘキサフルオロプロピレン共重合体(FEP)粉末は、532−8000(デュポン)が知られている。テトラフルオロエチレン−パーフルオロアルキルビニルエーテル共重合体(PFA)は、MP−10、MP102、(三井デュポンフロロケミカル)が知られている。特にMFR(メルトフローレート)が小さい流動性の低いものとして、MP103、MP300(三井デュポンフロロケミカル)、AC−5600、AC5539(ダイキン工業)等が本発明には適している。   Here, as the fluororesin used in the present invention, a resin having a good melt film forming property by firing and a relatively low melting point (preferably 250 to 300 ° C.) is preferably selected. Specific examples include fine powders of low molecular weight polytetrafluoroethylene (PTFE), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), and tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA). It is done. As the low molecular weight polytetrafluoroethylene (PTFE) powder, Lubron L-5, L-2 (Daikin Industries), MP1100, 1200, 1300 and TLP-10F-1 (Mitsui DuPont Fluorochemical) are known. As the tetrafluoroethylene-hexafluoropropylene copolymer (FEP) powder, 532-8000 (DuPont) is known. As the tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), MP-10, MP102, (Mitsui DuPont Fluorochemical) are known. In particular, MP103, MP300 (Mitsui Dupont Fluorochemical), AC-5600, AC5539 (Daikin Industries) and the like are suitable for the present invention as those having a low MFR (melt flow rate) and low fluidity.

また、発泡剤としては、アゾビスイソブチロニトリル(AIBN)等、発泡粒子としては、松本油化製薬のF−30,F−30VS,F−46,F−50D,F−55D等がある。また、既発泡粒子としては、松本油化製薬の100CA,80CA,F−80ED,F−30E,F−50E,F−80SDE等がある。炭素繊維には、合成繊維のアクリル長繊維からつくるPAN(ポリアクリロニトリル)系炭素繊維と、石炭タール、石油ピッチからつくるピッチ系炭素繊維がある。PAN系炭素繊維は、PANプリカーサー(ポリアクリロニトリル繊維)を炭素化して得られるもので、高強度・高弾性率の性質をもつ。ピッチ系炭素繊維は、ピッチプリカーサー(コールタールまたは石油重質分を原料として得られるピッチ繊維)を炭素化して得られるもので、製法の諸条件で、低弾性率から超高弾性率・高強度の広範囲の性質が得られる。超高弾性率品は、高剛性用途のほか、優れた熱伝導率や導電性の特性がある。   Examples of the foaming agent include azobisisobutyronitrile (AIBN), and examples of the foamed particles include Matsumoto Yuka Pharmaceutical's F-30, F-30VS, F-46, F-50D, and F-55D. . Further, as the already expanded particles, Matsumoto Yuka Pharmaceutical's 100CA, 80CA, F-80ED, F-30E, F-50E, F-80SDE and the like are available. Carbon fibers include PAN (polyacrylonitrile) carbon fibers made from synthetic acrylic long fibers and pitch carbon fibers made from coal tar and petroleum pitch. The PAN-based carbon fiber is obtained by carbonizing a PAN precursor (polyacrylonitrile fiber) and has properties of high strength and high elastic modulus. Pitch-based carbon fibers are obtained by carbonizing pitch precursors (pitch fibers obtained from coal tar or heavy petroleum oil as a raw material). Under various manufacturing conditions, low-modulus to ultra-high modulus / high strength A wide range of properties can be obtained. Ultra-high modulus products have excellent thermal conductivity and conductivity characteristics, as well as high rigidity applications.

<実施例A及び比較例A>
硬化剤を含む付加型液状シリコーンの中に、F−80EDと、XN−100−15M(150ミクロン)の粉体を分散したものを作製する。XN−100−15Mは、予め1/8の量のグリセリンと混合して置いたものを用いる。混合には、倉敷紡績株式会社のマゼルスターを用いて行った。炭素繊維は、熱処理をしたもの以外、グリセリンと混合したものを用いている。これは、炭素繊維とシリコーンゴムの接着性を落とすために用いている。図6の(a)に示すように、この未加硫付加型シリコーンゴムを、予め内面に接着層を形成したPFAチューブとその内側に0.5mmの内面に凸部補強であるリブ31を設けた芯金をセットしその間に、注入液としてPFAチューブと芯金の間に注入する。なお、リブ31の断面形状としては、図6の(b)〜(d)に示すようなものがある。このときに、120℃で加熱により1次加硫を行い、次に、200℃4時間2次加硫を行う。このとき、既発泡剤が壊れ、かつ炭素繊維の周りがシリコーンゴムと離型する。一連の工程で、外径をφ40(mm)にしたものを作製した。シリコーンゴム層は3mmとした。これを、(株)リコー製複写機 MF4570の定着ユニットにセットし、1000(W)ハロゲンヒータによる160℃までの温度上昇時間(秒)を測定した。加圧ローラは、標準品のシリコーンゴムに代えて、今回と同様のシリコーンゴムで、炭素繊維を用いていないものを作製して用いた。温度測定は、定着ローラの上部の部分に熱電対を設けて行った。発泡倍率は、ローラ作製と同じ配合のものを厚さ2mm、縦横100mmの金型に同様に注入加硫し、体積と重さと配合量から求めた。このサンプルにより、ゴム硬度を測定した。また、50mm角に切断し、3枚重ねて、25%圧縮 180℃ 22時間の圧縮永久歪を測定した。芯金厚さはリブ付き0.4mmである。ゴム硬度は、高分子計器(株)マイクロゴム硬度計 MD−1:一般ゴム用のタイプA(JIS A 近似値)を用い、測定した。表中では、ゴム硬度(MD−1)と表す。比較例A−4は、炭素繊維を600℃で2時間、空気中で処理したものの例である。比較例A−5、A−6は、ガラス繊維を用いたもの例である。比較例A−5は、旭ファイバーガラスで、06MW2−20 長さ100〜300μm プライマー無しの例である。比較例6は、同様のガラス繊維で、20MH2−20 長さ100〜300μm シラン系プライマー処理したものの例である。図7は熱処理しない炭素繊維を用いたものをカミソリで切断した切断面を示す断面図である。直線で、光っているものが炭素繊維であり、シリコーンゴムと剥離しているためにそのまま見えている。図8は600℃2時間空気中で熱処理した炭素繊維を用いたものをカミソリで切断した切断面を示す断面図である。炭素繊維の周りにシリコーンゴムが接着している。また、炭素繊維があまり観察されないのは、切断時にシリコーンゴムの部分が切断されているためである。このように、容易に炭素繊維周囲に顕著な非接着部があることが確認できる。
<Example A and Comparative Example A>
An addition type liquid silicone containing a curing agent is prepared by dispersing F-80ED and XN-100-15M (150 micron) powders. As XN-100-15M, one previously mixed with 1/8 amount of glycerin is used. Mixing was performed using a Mazerustar from Kurashiki Spinning Co., Ltd. The carbon fibers used are those mixed with glycerin other than those subjected to heat treatment. This is used to reduce the adhesion between carbon fiber and silicone rubber. As shown in FIG. 6 (a), this unvulcanized addition type silicone rubber is provided with a PFA tube in which an adhesive layer has been previously formed on the inner surface and a rib 31 serving as a convex reinforcement on the inner surface of 0.5 mm. A cored bar is set, and in the meantime, it is injected between the PFA tube and the cored bar as an injection solution. In addition, as a cross-sectional shape of the rib 31, there exists a thing as shown to (b)-(d) of FIG. At this time, primary vulcanization is performed by heating at 120 ° C., and then secondary vulcanization is performed at 200 ° C. for 4 hours. At this time, the foaming agent is broken and the periphery of the carbon fiber is released from the silicone rubber. In a series of steps, an outer diameter of φ40 (mm) was produced. The silicone rubber layer was 3 mm. This was set in a fixing unit of a copying machine MF4570 manufactured by Ricoh Co., Ltd., and the temperature rise time (seconds) up to 160 ° C. with a 1000 (W) halogen heater was measured. Instead of the standard silicone rubber, the pressure roller was made of the same silicone rubber that did not use carbon fiber. The temperature was measured by providing a thermocouple in the upper part of the fixing roller. The foaming ratio was obtained from the volume, weight, and blending amount of the same blending composition as that for the roller production by injection and vulcanization in a mold having a thickness of 2 mm and a width and width of 100 mm. With this sample, the rubber hardness was measured. Moreover, it cut | disconnected to 50 mm square, piled up three sheets, and measured the compression set of 25% compression 180 degreeC 22 hours. The core metal thickness is 0.4 mm with ribs. The rubber hardness was measured using Polymer Instruments Co., Ltd. Micro Rubber Hardness Meter MD-1: Type A for general rubber (JIS A approximate value). In the table, it is expressed as rubber hardness (MD-1). Comparative Example A-4 is an example of carbon fibers treated in air at 600 ° C. for 2 hours. Comparative Examples A-5 and A-6 are examples using glass fibers. Comparative example A-5 is an Asahi fiber glass and is an example without 06MW2-20 length 100-300 micrometers primer. Comparative Example 6 is an example of the same glass fiber treated with 20MH2-20, 100 to 300 μm in length, and a silane-based primer. FIG. 7 is a cross-sectional view showing a cut surface obtained by cutting a carbon fiber that is not heat-treated with a razor. The carbon fiber that is shining in a straight line is visible because it is peeled off from the silicone rubber. FIG. 8 is a cross-sectional view showing a cut surface obtained by cutting a carbon fiber heat-treated in air at 600 ° C. for 2 hours with a razor. Silicone rubber is adhered around the carbon fiber. Moreover, carbon fiber is not observed so much because the silicone rubber portion is cut during cutting. Thus, it can be easily confirmed that there is a remarkable non-bonded portion around the carbon fiber.

また、炭素繊維は、空気中で、300℃からごく微量に酸化されると言われており、表面に酸化層があるため接着性が向上したものと考えられる。ガラス繊維のものは、図示しないが、両方ともシリコーンゴムとほぼ完全に接着している。比較例A−7で用いているXN−100−05M(50ミクロン)は、比較のため600℃で2時間、空気中で処理しているものを用いている。   Carbon fiber is said to be oxidized in a very small amount from 300 ° C. in the air, and it is considered that the adhesion is improved because of the presence of an oxide layer on the surface. Although not shown, both glass fibers are almost completely bonded to the silicone rubber. For comparison, XN-100-05M (50 microns) used in Comparative Example A-7 was treated at 600 ° C. for 2 hours in air.

Figure 2011227512
Figure 2011227512

Figure 2011227512
Figure 2011227512

表1、表2からわかるように、実施例A−1、A−2、A−3ではゴム硬度を非常に小さくでき、圧縮永久歪も小さい。更に、30秒以内で立ち上がっている。比較例A−1とA−3では立ち上がりが遅く、比較例A−2では、圧縮永久歪が大きく100時間での160℃加熱加圧保持で加熱ローラの変形が見られる。比較例A−4、比較例A−5、比較例A−6、比較例A−7では、ローラ作製は行っていないが、ゴム硬度が大きく、圧縮永久歪も大きい。   As can be seen from Tables 1 and 2, in Examples A-1, A-2, and A-3, the rubber hardness can be made extremely small, and the compression set is also small. Furthermore, it stands up within 30 seconds. In Comparative Examples A-1 and A-3, the rise is slow, and in Comparative Example A-2, the compression set is large, and deformation of the heating roller is observed by heating and pressing at 160 ° C. for 100 hours. In Comparative Example A-4, Comparative Example A-5, Comparative Example A-6, and Comparative Example A-7, no roller was produced, but the rubber hardness was large and the compression set was also large.

<実施例Bと比較例B>
次に、硬化剤を含む付加型液状シリコーンの中に、F−30とXN−100−15M(150ミクロン)の粉体を分散したものを作製する。この未加硫付加型シリコーンゴムを、予め内面に接着層を形成したPFAチューブとその内側に0.5mmの内面に凸部補強であるリブを設けた芯金をセットしその間に、注入液としてPFAチューブと芯金の間に注入する。このときに、130℃で加熱により1次加硫を行い、F−30を発泡させる。次に、200℃4時間で2次加硫を行う。評価等は、実施例Aと同様に行った。
<Example B and Comparative Example B>
Next, F-30 and XN-100-15M (150 micron) powders are dispersed in addition-type liquid silicone containing a curing agent. This unvulcanized addition-type silicone rubber is set with a PFA tube with an adhesive layer formed on the inner surface in advance and a cored bar with ribs that are convex reinforcement on the inner surface of 0.5 mm inside. Inject between PFA tube and cored bar. At this time, primary vulcanization is performed by heating at 130 ° C. to foam F-30. Next, secondary vulcanization is performed at 200 ° C. for 4 hours. Evaluation and the like were performed in the same manner as in Example A.

Figure 2011227512
Figure 2011227512

実施例B−1、B−2、B−3は、ゴム硬度が小さく、圧縮永久歪も小さい。また、30秒以内で立ち上がっている。比較例B−1と比較例B−3では立ち上がりが遅く、比較例B−2では圧縮永久歪が大きく100時間での160℃加熱加圧保持で加熱ローラの変形が見られる。   Examples B-1, B-2, and B-3 have small rubber hardness and small compression set. Also, it stands up within 30 seconds. In Comparative Example B-1 and Comparative Example B-3, the rise is slow, and in Comparative Example B-2, the compression set is large, and the heating roller is deformed by heating and pressing at 160 ° C. for 100 hours.

<比較例C>
硬化剤を含む付加型液状シリコーンの中に、F−30とXN−100−15M(150ミクロン)の粉体を分散したものを作製する。この未加硫付加型シリコーンゴムを、予め内面に接着層を形成したPFAチューブとその内側に0.5mmの内面に凸部補強であるリブを設けた芯金をセットしその間に、注入液としてPFAチューブと芯金の間に注入する。このときに、130℃で加熱により1次加硫を行い、F−30を発泡させる。200℃4時間で2次加硫は行わず、外径をφ40(mm)にしたものを作製した。これを、(株)リコー製複写機 MF4570の定着ユニットにセットし、1000(W)ハロゲンヒータによる160℃までの温度上昇時間(秒)を測定した。配合は、重量部で行ったが、F−30は、発泡後に気泡として発泡倍率として体積で換算した。芯金厚さはリブ付き0.4mmである。
<Comparative Example C>
An addition-type liquid silicone containing a curing agent is prepared by dispersing F-30 and XN-100-15M (150 micron) powders. This unvulcanized addition-type silicone rubber is set with a PFA tube with an adhesive layer formed on the inner surface in advance and a cored bar with ribs that are convex reinforcement on the inner surface of 0.5 mm inside. Inject between PFA tube and cored bar. At this time, primary vulcanization is performed by heating at 130 ° C. to foam F-30. Secondary vulcanization was not performed at 200 ° C. for 4 hours, and an outer diameter of 40 mm was produced. This was set in a fixing unit of a copying machine MF4570 manufactured by Ricoh Co., Ltd., and the temperature rise time (seconds) up to 160 ° C. with a 1000 (W) halogen heater was measured. The blending was performed in parts by weight, but F-30 was converted by volume as foaming ratio as bubbles after foaming. The core metal thickness is 0.4 mm with ribs.

Figure 2011227512
Figure 2011227512

実施例A−5、A−6と比較例C−1、C−2を比較すると1次加硫時に発泡させ、固定し、2次加硫した方が、圧縮永久歪が非常に小さい。   When Examples A-5 and A-6 are compared with Comparative Examples C-1 and C-2, the compression set is much smaller when foamed, fixed, and secondarily vulcanized during the first vulcanization.

<実施例C>
実施例Cでは、実施例A−5の定着部材を芯金の厚さを変えて作製した。
<Example C>
In Example C, the fixing member of Example A-5 was produced by changing the thickness of the cored bar.

Figure 2011227512
Figure 2011227512

0.5mm以下で20秒以下となっており、0.2mmで破壊する。   It is 20 seconds or less at 0.5 mm or less, and breaks at 0.2 mm.

<実施例D>
実施例A−5のローラを(株)リコー製 MF4570の定着ユニットに装着し、10000枚、(株)リコー製imagio MP C4500の黒ベタ画像を通し、下記の表6に示すように、ローラ表面のトナー付着量と紙の巻き付きを見た。この結果、表面粗さ(十点平均粗さ:JIS B0601−1994)Rzで5μm以下であれば、効果があることが確認された。7μmのものは、7325枚で、ジャムが多発したため実験を取りやめている。
<Example D>
The roller of Example A-5 was mounted on a fixing unit of MF4570 manufactured by Ricoh Co., Ltd., and 10,000 sheets were passed through a black solid image of imgio MP C4500 manufactured by Ricoh Co., Ltd., as shown in Table 6 below. The toner adhesion amount and the paper wrapping were observed. As a result, it was confirmed that if the surface roughness (ten-point average roughness: JIS B0601-1994) Rz was 5 μm or less, there was an effect. The 7μm one is 7325, and the experiment has been canceled due to frequent jams.

Figure 2011227512
Figure 2011227512

<実施例E>
(株)リコー製 IPSIO Color 8100で作成した未定着画像の通紙テストを行った。このIPSIO Color 8100のトナーは、離型性が不十分なため定着ローラにシリコンオイルを塗布するシリコンオイル含侵されたオイル塗布部材を追加している。このIPSIO Color 8100に10000枚、黒ベタ画像を通し、ローラ表面のトナーの付着状態を観察した。特に大きな付着は観察されず、通常のものと何ら変わりがなかった。塗布部材を外したものは、60,000枚でローラへのトナーの顕著な付着がみられた。
<Example E>
An unfixed image created with IPSIO Color 8100 manufactured by Ricoh Co., Ltd. was tested. Since the toner of this IPSIO Color 8100 has insufficient releasability, an oil application member impregnated with silicone oil is added to apply silicone oil to the fixing roller. Through this IPSIO Color 8100, 10,000 black solid images were passed, and the toner adhesion state on the roller surface was observed. In particular, no large adhesion was observed, and there was no difference from the normal one. With the application member removed, 60,000 sheets showed remarkable adhesion of toner to the roller.

<実施例F>
実施例Fでは、実施例A−1のローラで、表面粗さRzで、2μm以下としたものを作製した。MF4570の定着ユニットを用いた定着試験機を作製し、imagio MP C4500の未定着画像を、加圧力を変えて、このローラに対して通紙した。下記の表7に示すように、2.9(N/cm)以下では、定着性が非常に悪く、19.6(N/cm)以上では、定着ローラへのトナー付着が見られた。紙の巻き付きは、トナー付着状態がさらに悪化し巻き付きが発生したものである。39.2(N/cm)以下では紙の巻き付きは見られない。なお、定着性は、定着後のべた画像に面の布を擦りつけ顕著に布にトナーが付いたものを定着不良とし、簡易判定した。
<Example F>
In Example F, the roller of Example A-1 with a surface roughness Rz of 2 μm or less was produced. A fixing tester using a fixing unit of MF4570 was prepared, and an unfixed image of imagio MP C4500 was passed through this roller while changing the pressing force. As shown in Table 7 below, the fixing property was very poor at 2.9 (N / cm 2 ) or less, and toner adhesion to the fixing roller was observed at 19.6 (N / cm 2 ) or more. . Paper wrapping is caused by further deterioration of the toner adhesion state and wrapping. Paper wrapping is not observed at 39.2 (N / cm 2 ) or less. The fixability was simply determined by rubbing the cloth on the surface against the solid image after fixing, and having the toner markedly attached with the toner as defective fixing.

Figure 2011227512
Figure 2011227512

なお、本発明は上記実施の形態に限定されるものではなく、特許請求の範囲内の記載であれば多種の変形や置換可能であることは言うまでもない。   In addition, this invention is not limited to the said embodiment, It cannot be overemphasized that various deformation | transformation and substitution are possible if it is description in a claim.

1;定着装置、10;定着部材、11;金属ローラ、
12;シリコーンゴム層、12−1;連泡部、12−2;気泡、
12−3;炭素繊維、13;PFA層、14;芯金、
15;ヒータ、16;加圧ローラ、17;加圧機構、31;リブ、
100;画像形成装置。
1; fixing device, 10; fixing member, 11; metal roller,
12; Silicone rubber layer, 12-1; Open cell part, 12-2; Air bubble,
12-3; carbon fiber, 13; PFA layer, 14; cored bar,
15; heater, 16; pressure roller, 17; pressure mechanism, 31; rib,
100: an image forming apparatus.

特開2006−133576号公報JP 2006-133576 A 特開2005−292218号公報JP 2005-292218 A

Claims (13)

熱源を内蔵する定着用回転体であって、該定着用回転体と、当該定着用回転体に記録媒体を介して圧接する加圧部とのニップ部に、未定着トナーを担持した前記記録媒体を搬送して未定着トナーを記録媒体に定着する定着用回転体を構成する定着部材において、
炭素繊維を含むシリコーンゴム中に空孔部を含んで構成されることを特徴とする定着部材。
A fixing rotator having a built-in heat source, wherein the recording medium carries unfixed toner in a nip portion between the fixing rotator and a pressure unit that presses the fixing rotator through the recording medium. A fixing member that constitutes a fixing rotating body that conveys the toner and fixes unfixed toner to a recording medium,
A fixing member comprising a void portion in a silicone rubber containing carbon fiber.
前記シリコーンゴム中の前記炭素繊維が非接着部分を有することを特徴とする請求項1記載の定着部材。   The fixing member according to claim 1, wherein the carbon fiber in the silicone rubber has a non-adhesive portion. 前記炭素繊維は、ピッチ系炭素繊維であることを特徴とする請求項1又は2に記載の定着部材。   The fixing member according to claim 1, wherein the carbon fibers are pitch-based carbon fibers. 熱源を内蔵する定着用回転体であって、該定着用回転体と、当該定着用回転体に記録媒体を介して圧接する加圧部とのニップ部に、未定着トナーを担持した前記記録媒体を搬送して未定着トナーを記録媒体に定着する定着用回転体を構成する定着部材の製造方法において、
未加硫付加型のシリコーンゴムに、発泡剤または発泡粒子を含有させ、さらに炭素繊維を含有させ、1次加硫及び発泡を行い、その後に2次加硫を行うことを特徴とする定着部材の製造方法。
A fixing rotator having a built-in heat source, wherein the recording medium carries unfixed toner in a nip portion between the fixing rotator and a pressure unit that presses the fixing rotator through the recording medium. In a method for manufacturing a fixing member that constitutes a fixing rotating body that conveys the toner and fixes unfixed toner to a recording medium,
A fixing member comprising an unvulcanized addition type silicone rubber containing a foaming agent or foamed particles, further containing carbon fiber, and primary vulcanization and foaming, followed by secondary vulcanization. Manufacturing method.
熱源を内蔵する定着用回転体であって、該定着用回転体と、当該定着用回転体に記録媒体を介して圧接する加圧部とのニップ部に、未定着トナーを担持した前記記録媒体を搬送して未定着トナーを記録媒体に定着する定着用回転体を構成する定着部材の製造方法において、
未加硫付加型のシリコーンゴムに、炭素繊維と既発泡粒子を含有させ1次加硫を行い、その後に2次加硫を行うことを特徴とする定着部材の製造方法。
A fixing rotator having a built-in heat source, wherein the recording medium carries unfixed toner in a nip portion between the fixing rotator and a pressure unit that presses the fixing rotator through the recording medium. In a method for manufacturing a fixing member that constitutes a fixing rotating body that conveys the toner and fixes unfixed toner to a recording medium,
A method for producing a fixing member, characterized in that carbon fiber and foamed particles are contained in an unvulcanized addition-type silicone rubber and primary vulcanization is performed, followed by secondary vulcanization.
前記炭素繊維は、ピッチ系炭素繊維であることを特徴とする請求項4又は5に記載の定着部材の製造方法。   The method for manufacturing a fixing member according to claim 4, wherein the carbon fiber is a pitch-based carbon fiber. 前記定着部材の発泡倍率は1.5以上3.0以下とすることを特徴とする請求項4又は5に記載の定着部材の製造方法。   6. The method for manufacturing a fixing member according to claim 4, wherein the expansion ratio of the fixing member is 1.5 or more and 3.0 or less. 請求項1〜3のいずれか1項に記載の定着部材、あるいは請求項4〜7のいずれか1項に記載の定着部材の製造方法を用いて製造した定着部材を用いたことを特徴とする定着用回転体。   A fixing member manufactured by using the fixing member according to any one of claims 1 to 3 or the fixing member manufacturing method according to any one of claims 4 to 7 is used. Rotor for fixing. 金属のローラ状の芯金を用い、該芯金の厚さが0.5mm以下0.25mm以上であって、前記芯金の内面に複数の周回凸部が前記ローラ芯金に一体に形成されていることを特徴とする請求項8記載の定着用回転体。   A metal roller-shaped metal core is used, and the thickness of the metal core is 0.5 mm or less and 0.25 mm or more, and a plurality of circumferential protrusions are integrally formed on the inner surface of the metal core. The fixing rotator according to claim 8, wherein the fixing rotator is provided. 最表面にフッ素系高分子よりなる層を有することを特徴とする請求項8又は9に記載の定着用回転体。   10. The fixing rotator according to claim 8, further comprising a layer made of a fluorine-based polymer on the outermost surface. 表面の粗さ、十点平均高さRzが5μm以下であることを特徴とする請求項8〜10のいずれか1項に記載の定着用回転体。   11. The fixing rotator according to claim 8, wherein the surface roughness and the ten-point average height Rz are 5 μm or less. 11. 請求項8〜11のいずれか1項に記載の定着用回転体を用いたことを特徴とする定着装置。   A fixing device using the fixing rotating body according to claim 8. 請求項12記載の定着装置と、画像形成部とを備え、該画像形成部で記録媒体上にトナー像を形成し、前記定着装置で記録媒体にトナー像を定着させて画像を形成することを特徴とする画像形成装置。   13. A fixing device according to claim 12, and an image forming unit, wherein the image forming unit forms a toner image on a recording medium, and the fixing device fixes the toner image on the recording medium to form an image. An image forming apparatus.
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