JP3806291B2 - Fixing roller manufacturing method and fixing roller - Google Patents
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Description
【０００１】
【発明の属する技術分野】
本発明は、定着ローラの製造方法および定着ローラに係り、特に、複写機、ファクシミリ、レーザービームプリンタ等の電子写真式画像形成装置のトナー画像定着ユニットに使用される加熱定着ローラの製造方法および該ローラに関する。
【０００２】
【従来の技術】
電子写真式画像形成装置は、所定の画像情報に基づいて感光ドラムを露光して感光ドラム上に静電潜像を形成するための静電潜像形成ユニットと、感光ドラム上に形成された静電潜像に現像ローラからトナーを供給・付着させて静電潜像に対応するトナー像（可視像）を形成するための現像ユニットと、感光ドラム上に形成されたトナー像を記録紙に転写させるための転写ユニットと、記録紙上に転写されたトナー像を記録紙に強固に固着させるための定着ユニットを備える。
【０００３】
定着ユニットでは、加圧ロールと加熱定着ロールとの間に未定着トナー像を担持する記録紙を挿通させ、加圧下に加熱定着ロールから熱を付与してトナー像を記録紙に定着させる。この定着の際のトナーは、粘着性を帯びているので、トナーと接する定着ロールの表面には、トナーが付着するのを防止する目的で、トナー離脱性に優れたフッ素樹脂を被覆することが一般的に行われている。
【０００４】
このフッ素樹脂による被覆は、懸濁液コーティング法や粉体塗装法に比べて、ピンホールが少なく、表面性状に優れ、耐電圧性にも優れていることから、主にフッ素樹脂のチューブを用いて行われている。すなわち、フッ素樹脂チューブを定着ローラ本体に被嵌させ、これを熱収縮と同時に融着させる。かかるフッ素樹脂チューブとしては、テトラフルオロエチレンとパーフルオロアルキルビニルエーテルとの共重合体（ＰＦＡ）が好ましく用いられている。
【０００５】
【発明が解決しようとする課題】
ところで、ＰＦＡ熱収縮性チューブとして現在量産されているものは、厚みが３０μｍ程度であり、薄いものでも２２〜２５μｍ程度であり、２０μｍ未満のものはない。このように厚みが厚いと、電子写真式画像形成装置に電源を投入してから加熱定着ロール表面が所定温度となるまでの時間、いわゆるウォームアップ時間が長くなり、また消費電力もそれだけ増加する。コーティングタイプのものでは１５μｍ程度の厚みのものが得られており、ウォームアップ時間に関しては、満足し得るものである。
【０００６】
従って、ウォームアップ時間短縮の観点から、ＰＦＡ熱収縮性チューブでもコーティングタイプ程度の厚みの薄いものが、少なくとも厚みが２０μｍ未満のものが望ましいが、メーカーから入手した厚み２０μｍ未満のＰＦＡ熱収縮性チューブを用いて定着ローラを作製すると、得られるＰＦＡ熱収縮性チューブ層にワレやシワ等の欠陥が発生するものが多かった。特にワレは、定着ローラにとっては致命的である。
【０００７】
従って、本発明は、厚みが２０μｍ未満のＰＦＡ熱収縮性チューブを用いながら、ワレ欠陥のほとんどないかまったくないフッ素樹脂被覆加熱定着ローラの製造方法およびかかる定着ローラを提供することを目的とする。
【０００８】
【課題を解決するための手段】
本発明者らは、上記目的を達成すべく、厚みが２０μｍ未満のＰＦＡ熱収縮性チューブをＰＦＡ熱収縮性チューブメーカーから多数入手し、定着ローラ本体に被嵌させ、熱収縮・融着後のチューブ層におけるワレ／シワ欠陥について研究した。その結果、ＰＦＡ熱収縮性チューブのヘーズと特にワレ欠陥の発生とが相関することを見いだし、２０μｍ未満のＰＦＡ熱収縮性チューブであっても、所定のヘーズを示すものであれば、所期の目的を達成し得ることがわかった。本発明は、この知見に基づく。
【０００９】
すなわち、本発明によれば、ローラ本体と、該ローラ本体の外周に熱収縮により被覆され、テトラフルオロエチレンとパーフルオロアルキルビニルエーテルとの共重合体から形成された、平均厚みが１２．６〜１５．６μｍである熱収縮性チューブとを備えた定着ローラの製造方法において、熱収縮性チューブのヘーズが１．５２〜５．９２％のものを選別して使用することを特徴とする定着ローラの製造方法が提供される。また、本発明によれば、テトラフルオロエチレンとパーフルオロアルキルビニルエーテルとの共重合体から形成され、平均厚みが１２．６〜１５．６μｍであり、ヘーズが１．５２〜５．９２％の熱収縮性チューブの熱収縮により外周が被覆されたローラ本体を備えることを特徴とする定着ローラが提供される。
【００１０】
本発明の熱収縮性チューブのヘーズは、５％以下であることが好ましい。
【００１１】
また、本発明の熱収縮性チューブは、縦方向において、好ましくは６．５〜８．７％、より好ましくは７．０〜７．７％の収縮率を示すものである。
【００１２】
さらにまた、本発明の熱収縮性チューブは、横方向において、好ましくは５．５〜７．１％、より好ましくは６．１〜６．９％の収縮率を示すものである。
【００１３】
本発明の好ましい態様において、熱収縮性チューブは、縦方向において６．５〜８．７％、より好ましくは７．０〜７．７％の収縮率を示し、かつ横方向において５．５〜７．１％、より好ましくは６．１〜６．９％の収縮率を示すものである。
【００１４】
本発明の熱収縮性チューブのヘーズ値を膜厚値で除した値は、好ましくは０．４７以下、より好ましくは０．３１以下である。
【００１５】
【発明の実施の形態】
以下、本発明をより詳しく説明する。
【００１６】
図１は、本発明の一実施の形態に係る加熱定着ローラの概略断面図である。図１に示すように、この加熱定着ローラ１０は、円筒状のローラ本体１１とローラ本体１１の外周面に熱収縮により形成されたフッ素樹脂チューブ層１２を有する。ローラ本体１１内には、定着ローラを加熱するためのヒータ等の加熱手段１３が内蔵されている。ローラ本体１１は、アルミニウム、アルミニウム合金等の金属で形成されている。
【００１７】
フッ素樹脂チューブ層１２は、厚み２０μｍ未満のＰＦＡ熱収縮性チューブのうち、ヘーズが６％以下であるものを選定し、その熱収縮性チューブをローラ本体１１に被嵌させ、加熱により熱収縮させるとともに、ローラ本体１１に融着させたものである。ここで、ヘーズ（曇価）は、ＪＩＳ Ｋ７１０５−１９８１に規定される通りのものである。いうまでもなく、このフッ素樹脂チューブ層１２は、定着ローラ１０の最外層を構成する。
【００１８】
本発明者らは、熱収縮性樹脂チューブメーカーである香川県丸亀市所在の大倉工業（株）に厚み２０μｍ未満のＰＦＡ熱収縮性チューブを委託加工してもらい、それらチューブを定着ローラ本体に被嵌させ、加熱によりローラ本体に収縮・融着させてフッ素樹脂チューブ層１２を形成し、そのワレ／シワ欠陥の発生について鋭意研究した。ここで、ワレは、定着ローラの長手方向に沿って形成されたフッ素樹脂チューブ層１２の破れであり、シワは、定着ローラの円周方向に沿って形成されたフッ素樹脂チューブ層１２の凸部である。
【００１９】
上記研究の結果、厚みが２０μｍ未満のＰＦＡ熱収縮性チューブでは、そのヘーズがワレ欠陥の発生と相関し、ヘーズが６％以下のＰＦＡ熱収縮性チューブであれば、ワレをほとんど発生させないか、まったく発生させないフッ素樹脂チューブ層１２を提供し得ることがわかった。本発明のＰＦＡからなる熱収縮性チューブは、５％以下のヘーズを有することが好ましい。
【００２０】
また、厚みが２０μｍ未満で、ヘーズが６％以下、好ましくは５％以下のＰＦＡ熱収縮性チューブのうち、縦方向（ＭＤともいう；ローラの長手方向に相当する）において６．５〜８．７％、より好ましくは７．０〜７．７％の収縮率を示すものを用いることにより、ワレの発生がより一層低減されることがわかった。
【００２１】
さらに、厚みが２０μｍ未満で、ヘーズが６％以下、好ましくは５％以下のＰＦＡ熱収縮性チューブのうち、横方向（ＴＤともいう；ローラの円周方向に相当する）において５．５〜７．１％、より好ましくは６．１〜６．９％の収縮率を示すものを用いることにより、シワの発生が顕著に低減されることがわかった。
【００２２】
従って、ワレおよびシワの両者の発生を防止する観点から、厚みが２０μｍ未満で、ヘーズが６％以下、好ましくは５％以下のＰＦＡ熱収縮性チューブのうち、縦方向において６．５〜８．７％の収縮率を、かつ横方向において５．５０〜７．１％の収縮率を示すものが特に好ましく、縦方向において７．０〜７．７％の収縮率を、かつ横方向において６．１〜６．９％の収縮率を示すものがさらに好ましい。
【００２３】
また、本発明のＰＦＡ熱収縮性チューブは、そのヘーズ値を膜厚値で除した値は、好ましくは０．４７以下、より好ましくは０．３１以下であることが望ましい。
【００２４】
本発明に使用する熱収縮性チューブは、以上説明した所定のＰＦＡ熱収縮性チューブをローラ本体１１に被嵌させ、例えば３８０℃の熱風循環炉に装入し、ローラ本体１１に対し熱収縮性チューブを熱収縮させるとともに融着させることにより製造することができる。
【００２５】
【実施例】
以下、本発明を実施例により説明するが、本発明はそれらに限定されるものではない。
【００２６】
以下の例において、熱収縮性チューブのヘーズおよびチューブの厚みは以下のようにして測定した。
【００２７】
まず、入手したＰＦＡ熱収縮性チューブを適当な大きさに切断し、矩形に開いた。ヘーズの測定は、日本電色工業（株）製の濁度計ＮＤＨ−１００１ＤＰを用いて行った。また、厚さの測定は、ケット科学製の高周波式膜厚計である万能型膜厚計ＬＺ−２００を用いて行った。このときのチューブの表面粗さＲａは、１．０μｍ以下であった。
【００２８】
実施例１
香川県丸亀市所在の大倉工業（株）に委託し、ＰＦＡ（三井・デュポンフロロケミカル（株）製３５０Ｊ）からなる、厚み２０μｍ未満で、外径６０．３ｍｍの熱収縮性チューブを入手した。これらＰＦＡ熱収縮性チューブは、インフレーション成形を経て製造されたものであるとの報告を受けた。
【００２９】
まず、これらＰＦＡ熱収縮性チューブの厚みとヘーズを測定した。それらの測定値を下記表１に示す。
【００３０】
次に、外径６０．３ｍｍのアルミニウム（Ａ５０５２）製ローラ本体の表面を乾式ブラスト処理した後、ローラ本体表面を溶剤で洗浄した。洗浄後、ローラ本体表面にフッ素樹脂塗料用プライマー（三井・デュポンフロロケミカル（株）製ＰＲ−９０２ＢＮ）を被覆し、その上に各ＰＦＡ熱収縮性チューブを被嵌させた。これを予め３８０℃に加熱した熱風循環電気炉（TABAI製SUPER-TEMP OVEN STPH-100）に装入し、ローラ本体に対しチューブを熱収縮させ、融着させて定着ローラを得た。このようにして、１種類のＰＦＡ熱収縮性チューブについて５本の定着ローラを作製した。厚みおよびヘーズは、５本の定着ローラに使用したチューブの平均値である。
【００３１】
得られた定着ローラによりシワおよびワレの発生を目視により判定した。その結果を表１に併記する。
【００３２】
【表１】
表１において、○印は、ワレがまったく発生しなかったことを示し、△印は、ワレがやや発生したことを示し、×印は、ワレが明瞭に発生したことを示す。ここで、×印に対し、△印は有意に優れており、△印に対し、○印は有意に優れている。
【００３４】
表１に示す結果から、厚みが２０μｍ未満のＰＦＡ熱収縮性チューブであっても、ヘーズが６％以下のものであれば、ワレを実質的に発生させないことがわかる。また、ヘーズは、５％以下が特に好ましいこともわかる。また、ヘーズ値をチューブ膜厚で除した値（ヘーズ／膜厚）の観点からすると、この値は、０．４７以下であることが好ましく、０．３１以下であることがより好ましいことがわかる。
【００３５】
実施例２
同様に大倉工業（株）から入手した厚み２０μｍ未満で外径６０．３ｍｍのＰＦＡ熱収縮性チューブのうちから、ヘーズが６％以下のものを選別した。これら選別した各チューブからほぼ３００ｍｍの長さの試験片を切りだし、その厚みを測定するとともに、その折径と長手方向の長さをノギスにより正確に測定した（常温）。次に、この切断片を３００℃に設定したホットプレート上に載せ、３分後にポットプレートから取り出し、再び折径と長手方向の長さをノギスにより測定した。各測定値から、ＭＤ収縮率とＴＤ収縮率を以下の計算式：
収縮率（％）＝［（加熱前の測定値−加熱後の測定値）／加熱前の測定値］×１００
で求めた。得られた各収縮率を下記表２に示す。
【００３６】
次に、各ＰＦＡ熱収縮性チューブを用いて実施例１と同様にして定着ローラを作製し、得られた定着ローラの表面樹脂層についてワレとシワについて目視で判定した。その結果を表２に併記する。
【００３７】
【表２】
また、縦軸をＭＤ収縮率とし、横軸をＴＤ収縮率とし、表２に示す試料２−１〜２−２８についての散布図を図２に示す。図２中、記号に付した数字１〜２８は、試料２−１〜２−２８に相当する。
【００３９】
これらの結果から、特に、図２からわかるように、ＴＤ収縮率が５．５〜７．１％であれば、実質的にシワを生じさせない。特にＴＤ収縮率が６．１〜６．９％であれば、シワをまったく生じさせない。また、ＭＤ収縮率が６．５〜８．７％であれば、実質的にワレを生じさせないこともわかる。特にＭＤ収縮率が７．０〜７．７％であれば、ワレをまったく生じさせない。従って、ＴＤ収縮率が５．５〜７．１％であり、かつＭＤ収縮率が６．５〜８．７％であれば実質的にシワもワレも生じさせず、ＴＤ収縮率が６．１〜６．９％であり、かつＭＤ収縮率が７．０〜７．７％であれば、シワもワレをまったく生じさせないことがわかる。また、表２に示す試料２−２９〜２−３３についての結果から、厚みが３０μｍ以上のＰＦＡ熱収縮性チューブは、ＴＤ、ＭＤ収縮率に関係なくワレとシワのないフッ素樹脂チューブ層が得られることがいえるので、上記ＴＤ収縮率およびＭＤ収縮率とワレ、シワの発生との関係は、厚み２０μｍ未満のＰＦＡ熱収縮性チューブに特有のものであることがわかる。
【００４０】
【発明の効果】
以上述べたように、本発明によれば、厚みが２０μｍ未満のＰＦＡ熱収縮性チューブを用いながら、ワレ欠陥のほとんどないかまったくないフッ素樹脂被覆加熱定着ローラが提供される。
【図面の簡単な説明】
【図１】本発明の定着ローラの一例を示す概略断面図。
【図２】実施例２における結果を示すグラフ。
【符号の説明】
１１…ローラ本体
１２…フッ素樹脂（ＰＦＡ）チューブ層
１３…加熱手段[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fixing roller manufacturing method and a fixing roller, and more particularly to a heating fixing roller manufacturing method used in a toner image fixing unit of an electrophotographic image forming apparatus such as a copying machine, a facsimile machine, and a laser beam printer, and the like. Concerning Laura .
[0002]
[Prior art]
The electrophotographic image forming apparatus includes an electrostatic latent image forming unit for exposing a photosensitive drum based on predetermined image information to form an electrostatic latent image on the photosensitive drum, and a static image formed on the photosensitive drum. A developing unit for supplying and attaching toner to the electrostatic latent image from the developing roller to form a toner image (visible image) corresponding to the electrostatic latent image, and the toner image formed on the photosensitive drum on the recording paper A transfer unit for transferring and a fixing unit for firmly fixing the toner image transferred onto the recording paper to the recording paper are provided.
[0003]
In the fixing unit, a recording paper carrying an unfixed toner image is inserted between the pressure roll and the heat fixing roll, and heat is applied from the heat fixing roll under pressure to fix the toner image on the recording paper. Since the toner at the time of fixing is sticky, the surface of the fixing roll in contact with the toner may be coated with a fluororesin having excellent toner detachability for the purpose of preventing the toner from adhering. Generally done.
[0004]
Compared to suspension coating and powder coating methods, this coating with fluororesin has fewer pinholes, excellent surface properties, and excellent voltage resistance. Has been done. That is, the fluororesin tube is fitted on the fixing roller body, and is fused at the same time as the heat shrinkage. As such a fluororesin tube, a copolymer (PFA) of tetrafluoroethylene and perfluoroalkyl vinyl ether is preferably used.
[0005]
[Problems to be solved by the invention]
By the way, what is currently mass-produced as a PFA heat-shrinkable tube has a thickness of about 30 μm, and even a thin one has a thickness of about 22 to 25 μm, and none is less than 20 μm. When the thickness is large in this way, the time from when the electrophotographic image forming apparatus is turned on until the surface of the heat-fixing roll reaches a predetermined temperature, the so-called warm-up time, becomes longer, and the power consumption increases accordingly. The coating type has a thickness of about 15 μm, and the warm-up time is satisfactory.
[0006]
Therefore, from the viewpoint of shortening the warm-up time, it is desirable that the PFA heat-shrinkable tube is as thin as the coating type, but at least the thickness is less than 20 μm, but the PFA heat-shrinkable tube obtained from the manufacturer with a thickness of less than 20 μm. When a fixing roller was produced using the above, many defects such as cracks and wrinkles occurred in the obtained PFA heat-shrinkable tube layer. In particular, cracking is fatal for the fixing roller.
[0007]
Accordingly, an object of the present invention is to provide a method for producing a fluororesin-coated heat-fixing roller having little or no crack defect while using a PFA heat-shrinkable tube having a thickness of less than 20 μm and such a fixing roller .
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present inventors have obtained a large number of PFA heat-shrinkable tubes having a thickness of less than 20 μm from a PFA heat-shrinkable tube manufacturer, fitted them on the fixing roller main body, and after heat shrinking and fusing. The crack / wrinkle defects in the tube layer were studied. As a result, it has been found that the haze of the PFA heat-shrinkable tube correlates with the occurrence of cracking defects, and even if the PFA heat-shrinkable tube of less than 20 μm exhibits a predetermined haze, it can be expected. It turns out that the objective can be achieved. The present invention is based on this finding.
[0009]
That is, according to the present invention, the roller body and the outer periphery of the roller body are covered by heat shrinkage and formed from a copolymer of tetrafluoroethylene and perfluoroalkyl vinyl ether, having an average thickness of 12.6 to 15 In a method of manufacturing a fixing roller having a heat-shrinkable tube having a diameter of .6 μm , a fixing roller having a heat-shrinkable tube having a haze of 1.52 to 5.92% is selected and used. A method of manufacturing a roller is provided. Further, according to the present invention, it is formed from a copolymer of tetrafluoroethylene and perfluoroalkyl vinyl ether, has an average thickness of 12.6 to 15.6 μm , and a haze of 1.52 to 5.92%. There is provided a fixing roller comprising a roller body whose outer periphery is covered by heat shrinkage of the heat shrinkable tube.
[0010]
The haze of the heat-shrinkable tube of the present invention is preferably 5% or less.
[0011]
Moreover, the heat-shrinkable tube of the present invention preferably exhibits a shrinkage rate of 6.5 to 8.7%, more preferably 7.0 to 7.7% in the longitudinal direction.
[0012]
Furthermore, the heat-shrinkable tube of the present invention preferably exhibits a shrinkage rate of 5.5 to 7.1%, more preferably 6.1 to 6.9% in the lateral direction.
[0013]
In a preferred embodiment of the present invention, the heat-shrinkable tube exhibits a shrinkage of 6.5 to 8.7% in the longitudinal direction, more preferably 7.0 to 7.7%, and 5.5 to 5.5 in the transverse direction. The shrinkage rate is 7.1%, more preferably 6.1 to 6.9%.
[0014]
The value obtained by dividing the haze value of the heat-shrinkable tube of the present invention by the film thickness value is preferably 0.47 or less, more preferably 0.31 or less.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in more detail.
[0016]
FIG. 1 is a schematic sectional view of a heat fixing roller according to an embodiment of the present invention. As shown in FIG. 1, the
[0017]
As the
[0018]
The present inventors have Okura Industry Co., Ltd. located in Marugame City, Kagawa Prefecture, a heat-shrinkable resin tube manufacturer, commissioned processing of PFA heat-shrinkable tubes with a thickness of less than 20 μm, and these tubes are covered on the fixing roller body. The
[0019]
As a result of the above research, in a PFA heat-shrinkable tube having a thickness of less than 20 μm, its haze correlates with the occurrence of crack defects, and if it is a PFA heat-shrinkable tube with a haze of 6% or less, little cracking is generated. It has been found that the
[0020]
Further, among PFA heat-shrinkable tubes having a thickness of less than 20 μm and a haze of 6% or less, preferably 5% or less, 6.5 to 8. in the longitudinal direction (also referred to as MD; corresponding to the longitudinal direction of the roller). It was found that the occurrence of cracking was further reduced by using a material having a shrinkage of 7%, more preferably 7.0 to 7.7%.
[0021]
Further, among PFA heat-shrinkable tubes having a thickness of less than 20 μm and a haze of 6% or less, preferably 5% or less, 5.5 to 7 in the lateral direction (also referred to as TD; corresponding to the circumferential direction of the roller). It has been found that the occurrence of wrinkles is remarkably reduced by using a material having a shrinkage of 0.1%, more preferably 6.1 to 6.9%.
[0022]
Therefore, from the viewpoint of preventing the occurrence of cracks and wrinkles, among PFA heat-shrinkable tubes having a thickness of less than 20 μm and a haze of 6% or less, preferably 5% or less, 6.5-8. Those having a shrinkage of 7% and a shrinkage of 5.50 to 7.1% in the transverse direction are particularly preferred, a shrinkage of 7.0 to 7.7% in the longitudinal direction and 6 in the transverse direction. Those exhibiting a shrinkage of 0.1 to 6.9% are more preferable.
[0023]
In the PFA heat-shrinkable tube of the present invention, the value obtained by dividing the haze value by the film thickness value is preferably 0.47 or less, more preferably 0.31 or less.
[0024]
The heat-shrinkable tube used in the present invention is obtained by fitting the predetermined PFA heat-shrinkable tube described above on the
[0025]
【Example】
EXAMPLES Hereinafter, although an Example demonstrates this invention, this invention is not limited to them.
[0026]
In the following examples, the heat shrinkable tube haze and tube thickness were measured as follows.
[0027]
First, the obtained PFA heat-shrinkable tube was cut into an appropriate size and opened into a rectangle. The haze was measured using a turbidimeter NDH-1001DP manufactured by Nippon Denshoku Industries Co., Ltd. The thickness was measured using a universal film thickness meter LZ-200, which is a high-frequency film thickness meter manufactured by Kett Science. At this time, the surface roughness Ra of the tube was 1.0 μm or less.
[0028]
Example 1
We contracted Okura Industry Co., Ltd., located in Marugame City, Kagawa Prefecture, and obtained a heat-shrinkable tube made of PFA (Mitsui / DuPont Fluoro Chemical Co., Ltd. 350J) with a thickness of less than 20 μm and an outer diameter of 60.3 mm. These PFA heat-shrinkable tubes were reported to have been manufactured through inflation molding.
[0029]
First, the thickness and haze of these PFA heat-shrinkable tubes were measured. The measured values are shown in Table 1 below.
[0030]
Next, the surface of the roller body made of aluminum (A5052) having an outer diameter of 60.3 mm was dry-blasted, and then the surface of the roller body was washed with a solvent. After cleaning, the surface of the roller body was covered with a primer for fluororesin paint (PR-902BN manufactured by Mitsui DuPont Fluorochemical Co., Ltd.), and each PFA heat-shrinkable tube was fitted thereon. This was charged in a hot air circulating electric furnace (TABAI SUPER-TEMP OVEN STPH-100) heated in advance to 380 ° C., and the tube was thermally contracted and fused to the roller body to obtain a fixing roller. In this way, five fixing rollers were produced for one type of PFA heat-shrinkable tube. The thickness and haze are the average values of the tubes used for the five fixing rollers.
[0031]
The resulting fixing roller was visually judged for wrinkles and cracks. The results are also shown in Table 1.
[0032]
[Table 1]
In Table 1, ◯ marks indicate that cracks did not occur at all, Δ marks indicate that cracks occurred slightly, and X marks indicate that cracks occurred clearly. Here, the Δ mark is significantly superior to the X mark, and the ○ mark is significantly superior to the Δ mark.
[0034]
From the results shown in Table 1, it can be seen that cracks are not substantially generated even if the PFA heat-shrinkable tube has a thickness of less than 20 μm as long as the haze is 6% or less. It can also be seen that the haze is particularly preferably 5% or less. From the viewpoint of the value obtained by dividing the haze value by the tube film thickness (haze / film thickness), this value is preferably 0.47 or less, more preferably 0.31 or less. .
[0035]
Example 2
Similarly, those having a haze of 6% or less were selected from PFA heat-shrinkable tubes having a thickness of less than 20 μm and an outer diameter of 60.3 mm obtained from Okura Kogyo Co., Ltd. A test piece having a length of about 300 mm was cut out from each of the selected tubes, the thickness thereof was measured, and the folding diameter and the length in the longitudinal direction were accurately measured with a caliper (room temperature). Next, this cut piece was placed on a hot plate set at 300 ° C., taken out from the pot plate after 3 minutes, and the folding diameter and the length in the longitudinal direction were again measured with a caliper. From each measured value, MD shrinkage rate and TD shrinkage rate are calculated as follows:
Shrinkage rate (%) = [(measured value before heating−measured value after heating) / measured value before heating] × 100
I asked for it. Each shrinkage obtained is shown in Table 2 below.
[0036]
Next, a fixing roller was prepared using each PFA heat-shrinkable tube in the same manner as in Example 1, and cracks and wrinkles were visually determined for the surface resin layer of the obtained fixing roller. The results are also shown in Table 2.
[0037]
[Table 2]
In addition, the vertical axis is MD shrinkage, the horizontal axis is TD shrinkage, and a scatter diagram for Samples 2-1 to 2-28 shown in Table 2 is shown in FIG. In FIG. 2, numerals 1 to 28 attached to the symbols correspond to samples 2-1 to 2-28.
[0039]
From these results, as can be seen from FIG. 2 in particular, when the TD shrinkage is 5.5 to 7.1%, wrinkles are not substantially generated. In particular, if the TD shrinkage is 6.1 to 6.9%, no wrinkles are generated. It can also be seen that if the MD shrinkage is 6.5 to 8.7%, substantially no cracking occurs. In particular, if the MD shrinkage is 7.0 to 7.7%, no cracking occurs. Therefore, if the TD shrinkage is 5.5 to 7.1% and the MD shrinkage is 6.5 to 8.7%, substantially no wrinkles or cracks occur, and the TD shrinkage is 6. If it is 1 to 6.9% and the MD shrinkage rate is 7.0 to 7.7%, it can be seen that wrinkles do not cause cracks at all. Further, from the results for Samples 2-29 to 2-33 shown in Table 2, a PFA heat-shrinkable tube having a thickness of 30 μm or more has a fluororesin tube layer free from cracks and wrinkles regardless of the TD and MD shrinkage rates. Therefore, it can be seen that the relationship between the TD shrinkage rate and the MD shrinkage rate and the occurrence of cracks and wrinkles is peculiar to PFA heat-shrinkable tubes having a thickness of less than 20 μm.
[0040]
【The invention's effect】
As described above, according to the present invention, there is provided a fluororesin-coated heat-fixing roller having little or no crack defect while using a PFA heat-shrinkable tube having a thickness of less than 20 μm.
[Brief description of the drawings]
FIG. 1 is a schematic sectional view showing an example of a fixing roller of the present invention.
2 is a graph showing the results in Example 2. FIG.
[Explanation of symbols]
DESCRIPTION OF
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000219482A JP3806291B2 (en) | 2000-07-19 | 2000-07-19 | Fixing roller manufacturing method and fixing roller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000219482A JP3806291B2 (en) | 2000-07-19 | 2000-07-19 | Fixing roller manufacturing method and fixing roller |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002040851A JP2002040851A (en) | 2002-02-06 |
| JP3806291B2 true JP3806291B2 (en) | 2006-08-09 |
Family
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| Application Number | Title | Priority Date | Filing Date |
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| JP2000219482A Expired - Fee Related JP3806291B2 (en) | 2000-07-19 | 2000-07-19 | Fixing roller manufacturing method and fixing roller |
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| JP (1) | JP3806291B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019104262A1 (en) | 2017-11-27 | 2019-05-31 | Chemours-Mitsui Fluoroproducts Co., Ltd. | Tfe/pave-copolymer for shape memory molded article and shape memory molded article |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08185072A (en) * | 1994-12-28 | 1996-07-16 | Nissei Denki Kk | Production of heat roller |
| JPH10180874A (en) * | 1996-12-27 | 1998-07-07 | Canon Inc | Method for coating fluororesin tube and fixing member manufactured by the method |
-
2000
- 2000-07-19 JP JP2000219482A patent/JP3806291B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019104262A1 (en) | 2017-11-27 | 2019-05-31 | Chemours-Mitsui Fluoroproducts Co., Ltd. | Tfe/pave-copolymer for shape memory molded article and shape memory molded article |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2002040851A (en) | 2002-02-06 |
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