JP3595695B2 - Method for transferring surface pattern of transfer member to fluororesin surface on cylindrical substrate - Google Patents

Description

（実施例４）
本発明の第４の実施例について（図４）を参照しながら説明する。
【００７０】
４１は最外層にフッ素樹脂を有する被加工円筒材であり、実施例１の被加工円筒材１１とおなじものでありフッ素樹脂層は完全には成膜されておらず、表面にクラック・凹凸等の不良が見られた。またその際フッ素樹脂表面の表面組さは、十点平均粗さ（Ｒｚ）で１５μｍであった。
【００７１】
４２は本発明における面転写部材であり、シート状で前記被加工円筒材当接側には前記円筒状基材上に仮形成されたフッ素樹脂膜に転写したい表面模様が形成されたのものをＵ字に曲げて用いている。本実施例では、幅２５０ｍｍ、長さ６００ｍｍ、厚み０．０５ｍｍで前記円筒状基材のシリコーンゴムよりも熱膨の小さいポリイミドシート（東レ・デュポン社製、商品名：カプトン２００Ｈを用いた。また前記被加工円筒材当接側はその面粗さを十点平均粗さ（Ｒｚ）で０．５μｍに加工して用いた。
【００７２】
面転写部材４２はその両端を、一方の端が移動した分だけもう一方の端が相対的に移動するようなシート保持治具４３に固定している。本実施例では、実施例２と同様に図４のようなピニオンギアにラックを往復運動させるためのモータを接続したラック＆ピニオンの機構を用いた。まず、面転写部材４２とシート保持治具４３の間に被加工円筒材４１を通し被加工円筒材４１の芯金の両端を保持回転させるための回転自在な回転台４４に接続する（図４．Ｂ）。本実施例では、この状態で外径１６ｍｍの巻き付けローラ４６を２本用い面転写部材であるポリイミドシート４２を被加工円筒材４１に約４／５巻き付けた。前記巻き付けローラは回転自在ではあるが位置は固定されている。この状態でシート保持治具４３を移動しでシートが前記被加工円筒材にぴたりと付く状態でシート保持治具４３の位置を固定する。
【００７３】
以上のように装置を設定した後、ポリイミドシートの上部より（外側から）前記被加工円筒材を加熱した。本実施例では前記面転写シートより多少長い２８０ｍｍの３ｋＷ出力の赤外線ラインヒータ４５（線集光タイプ；焦点距離ｆ＝５０ｍｍ）を面転写部材である前記シート表面より約４０ｍｍ離して配置した。シート保持治具４３に接続したモータにより前記シートを約２１ｍｍ／ｓｅｃの速度で移動させつつ前記シート表面が２７０℃になるまで前記赤外線ラインヒータにより加熱した（３ｋＷ）。被加工円筒材４１はそれに伴い約２０ｒｐｍの速度で従動回転した。前記シートの端が前記シート保持治具の限界に来る前に前記モータを反転させる。約２０ｓｅｃ毎にこの動作を繰り返しながら面転写を行なったところ６０ｓｅｃで面転写および成膜が可能であった。これは面転写部材である前記ポリイミドシートおよび前記フッ素樹脂は赤外線をあまり吸収しないため熱膨張も少なくその上選択的に融着界面が加熱されるため早くなったといえる。その後、円筒材製品４１６を冷却しシート保持治具４３を移動させ前記シートをゆるめた状態にして円筒材製品４１６を回転台４４より取り外した。加熱の際前記シリコーンゴムの熱膨張が、面転写部材である前記ポリイミドシートより大きいため前記被加工円筒材のシートが巻き付いた部分で、シリコーンゴムがより膨張して、面転写部材と前記円筒状基材との間で前記フッ素樹脂層が加圧された状態を作り出す。また前記赤外線ラインヒータからの熱により前記円筒状基材表層のフッ素樹脂（ＦＥＰ）が軟化し面転写および成膜がなされた。
【００７４】
前記被加工円筒材は回転しているため前記被加工円筒材全面にわたり同様に面転写および成膜が行なわれた。また前記円筒状基材表層のフッ素樹脂は軟化している状態で溶融まではしていない、さらに前記被加工円筒材・円筒材製品とシートの剥離の場所は直接加熱していないため、前記円筒状基材表層のフッ素樹脂は面転写部材である前記シートには付着せずそのため剥離跡も残らなかった。
【００７５】
このようにして得られた円筒材製品４１６表層のフッ素樹脂の焼成膜の表面の粗さは、十点平均粗さ（Ｒｚ）で０．５μｍであり、前記面転写部材の表面模様がフッ素樹脂表面に転写され、かつフッ素樹脂の成膜がなされた。またその際成膜されたフッ素樹脂層表面を電子顕微鏡で観察したところ、表面にクラック等の不良は観察されなかった。また前記円筒状基材のシリコーンゴム層に劣化はみられなかった。また、それぞれの被加工円筒材で加熱前に前記保持治具を前記シートが前記被加工円筒材にぴたりと付く位置に固定することで円筒状基材の外径のばらつきに関係なく被加工円筒材と面転写部材との隙間を一定にできるため円筒状基材の外径ばらつきによる不良はなくなった。またシート状のため、掃除もしやすくなった。
【００７６】
本実施例では、面転写部材としてポリイミドシートを用いたが前記フッ素樹脂の焼成成膜時に必要な温度に耐え前記円筒状基材よりも熱膨張の小さいものであれば特に制約はない。鉄・ＳＵＳ・アルミニウム等の金属材料やポリフェニンサルファイド等の耐熱性樹脂を用いてもよい。
【００７７】
（実施例５）
本発明の第５の実施例について（図５）を参照しながら説明する。
【００７８】
５１は最外層にフッ素樹脂を有する被加工円筒材であり、その外径は２０ｍｍで軸方向の長さは、２３０ｍｍである。その断面図を（図５．Ａ）に示す。５１１は円筒状基材５１０の芯金でありアルミニウムで構成され、その直径は１８ｍｍである。芯金５１１上にはプライマー層５１２（前記１１２、３１２と同一原料）を介してＬＴＶのシリコーンゴム層５１３が接着されておりその厚みは約１ｍｍである。前記シリコーンゴム層はプライマーを塗布した芯金を円筒状金型に挿入し、ＬＴＶの未加硫シリコーンゴム（１１３、３１３に同じ）を注入し、それを加熱硬化することにより形成した。５１４はシリコーンゴム層５１３と表層フッ率樹脂層を接着するためのプライマー層であり、フッ素ゴムとフッ素樹脂（ＦＥＰ）の混合物で構成される。プライマー層５１４はフッ素ゴムとフッ素樹脂の混合物から成る水性塗料をスプレーにより塗装し２００℃で３０分加熱硬化させて得られたもので、その厚みは２５μｍであった。プライマー層５１４上にはフッ素樹脂（ＦＥＰ）層５１５が形成されている。フッ素樹脂層５１５はフッ素樹脂（ＦＥＰ）のディスパージョン（１１５、３１５に同じ）をスプレーで塗装し、１５０℃で２０分乾燥した後、３００℃で２０分の予備加熱焼成をしたものであり、その際の厚みは１５μｍであった。その際フッ素樹脂層は完全には成膜されておらず、表面にクラック・凹凸等の不良が見られた。またその際フッ素樹脂表面の表面粗さは、十点平均粗さ（Ｒｚ）で１５μｍであった。
【００７９】
５２は本発明における面転写部材であり、シート状で前記被加工円筒材当接側には前記円筒状基材上に仮形成されたフッ素樹脂膜に転写したい表面模様が形成されたのものをＵ字に曲げて用いている。本実施例では、幅２５０ｍｍ、長さ６００ｍｍ、厚み０．０５ｍｍで円筒状基材のシリコーンゴムよりも熱膨の小さいポリイミドシート（４２に同じ）を用いた。また前記被加工円筒材当接側はその面粗さを十点平均粗さ（Ｒｚ）で０．５μｍに加工して用いた。
【００８０】
面転写部材５２はその両端を、一方の端が移動した分だけもう一方の端が相対的に移動するようなシート保持治具５３に固定している。本実施例では、実施例２と同様に図５のようなピニオンギアにラックを往復運動させるためのモータを接続したラック＆ピニオンの機構を用いた。まず、面転写部材５２とシート保持治具５３の間に被加工円筒材５１を通し被加工円筒材５１の芯金の両端を保持回転させるための回転自在な回転台５４に接続する（図５．Ｂ）。本実施例では、この状態で外径１６ｍｍの巻き付けローラ５６を２本用い面転写部材であるポリイミドシート５２を被加工円筒材５１に約４／５巻き付ける。前記巻き付けローラは回転自在ではあるが位置は固定されている。この状態でシート保持治具５３を移動してシートが前記被加工円筒材にぴたりと付く状態でシート保持治具５３の位置を固定する。
【００８１】
以上のように装置を設定した後、ポリイミドシートの上部より（外側から）前記被加工円筒材を加熱した。本実施例では前記面転写シートより多少長い２８０ｍｍの３ｋＷ出力の赤外線ラインヒータ５５（線集光タイプ；焦点距離ｆ＝５０ｍｍ）を面転写部材である前記シート表面より約４０ｍｍ離して配置した。シート保持治具５３に接続したモータにより前記シートを約２１ｍｍ／ｓｅｃの速度で移動させつつ前記シート表面が２７０℃になるまで前記赤外線ラインヒータにより加熱した（３ｋＷ）。被加工円筒材５１はそれに伴い約２０ｒｐｍの速度で従動回転した。前記シートの端が前記シート保持治具の限界に来る前に前記モータを反転させる。約２０ｓｅｃ毎にこの動作を繰り返しながら面転写を行なったところ９０ｓｅｃで面転写および成膜が可能であった。これは面転写部材である前記ポリイミドシートおよび前記フッ素樹脂は赤外線をあまり吸収しないため熱膨張も少なくその上選択的に融着界面が加熱されるため早くなったといえる。
【００８２】
その後、円筒材製品５１６を冷却しシート保持治具５３を移動させ前記シートをゆるめた状態にして円筒材製品５１６を回転台５４より取り外した。加熱の際前記シリコーンゴムの熱膨張が、面転写部材である前記ポリイミドシートより大きいため前記被加工円筒材のシートが巻き付いた部分で、シリコーンゴムがより膨張して、面転写部材と前記円筒状基材との間で前記フッ素樹脂層が加圧された状態を作り出す。また前記赤外線ラインヒータからの熱により前記円筒状基材表層のフッ素樹脂（ＦＥＰ）が軟化し面転写および成膜がなされた。
【００８３】
前記被加工円筒材は回転しているため前記被加工円筒材全面にわたり同様に面転写および成膜が行なわれた。また前記円筒状基材表層のフッ素樹脂は軟化している状態で溶融まではしていない、さらに前記被加工円筒材・円筒材製品とシートの剥離の場所は直接加熱していないため、前記円筒状基材表層のフッ素樹脂は面転写部材である前記シートには付着せずそのため剥離跡も残らなかった。
【００８４】
このようにして得られた円筒材製品５１６表層のフッ素樹脂の焼成膜５１７の表面の粗さは、十点平均粗さ（Ｒｚ）で０．５μｍであり、前記面転写部材の表面模様がフッ素樹脂表面に転写され、かつフッ素樹脂の成膜がなされた。またその際成膜されたフッ素樹脂層表面を電子顕微鏡で観察したところ、表面にクラック等の不良は観察されなかった。また前記円筒状基材のシリコーンゴム層に劣化はみられなかった。また、それぞれの被加工円筒材で加熱前に前記保持治具を前記シートが前記被加工円筒材にぴたりと付く位置に固定することで円筒状基材の外径のばらつきに関係なく被加工円筒材と面転写部材との隙間を一定にできるため円筒状基材の外径ばらつきによる不良はなくなった。またシート状のため、掃除もしやすくなった。
【００８５】
本実施例では、面転写部材としてポリイミドシートを用いたが前記フッ素樹脂の焼成成膜時に必要な温度に耐え前記円筒状基材よりも熱膨張の小さいものであれば特に制約はない。鉄・ＳＵＳ・アルミニウム等の金属材料やポリフェニンサルファイド等の耐熱性樹脂を用いてもよい。
【００８６】
さらに本実施例のように前記円筒状基材のシリコーンゴム層が１ｍｍと非常に薄い場合、円筒状の面転写を使用した際の加工条件および評価結果を下表２に示す。
その結果より本実施例のように前記シリコーンゴム層の厚みが薄いために、前記円筒状基材と面転写部材の隙間を非常に狭くしなければならない場合、円筒状の面転写部材ヘの前記被加工円筒材の挿入が困難になったり、加工後に円筒材製品が抜けにくくなってしまうということは、シートを巻きつける本方法では、加熱前に前記被加工円筒材をセットし前記シートを巻き、加工後にその前記シートを剥がしてやれば良いため無関係である。また加熱前に前記シート保持治具を前記シートが前記被加工円筒材にぴたりと付く状態で固定することで前記被加工円筒材と面転写部材の隙間を非常に狭くできるため、前記シリコーンゴム層の厚みが薄い場合に十分対応でき前記シリコーンゴム層を劣化させずに面転写および成膜ができた。
【００８７】
【表２】

（実施例６）
本発明の第６の実施例について（図６）を参照しながら説明する。
【００８８】
６１は最外層にフッ素樹脂を有する被加工円筒材であり、実施例１の被加工円筒材１１とおなじものでありフッ素樹脂層は完全には成膜されておらず、表面にクラック・凹凸等の不良が見られた。またその際フッ素樹脂表面の表面組さは、十点平均粗さ（Ｒｚ）で１５μｍであった。
【００８９】
６２は本発明における面転写部材であり、シート状で前記被加工円筒材当接側には前記円筒状基材上に仮形成されたフッ素樹脂膜に転写したい表面模様が形成されたのものをＵ字に曲げて用いている。本実施例では、幅２５０ｍｍ、長さ６００ｍｍ、厚み０．０５ｍｍで円筒状基材のシリコーンゴムよりも熱膨の小さいポリイミドシート（４２、５２に同じ）を用いた。また前記被加工円筒材当接側はその面粗さを十点平均粗さ（Ｒｚ）で０．５μｍに加工して用いた。
【００９０】
本実施例では前記ポリイミドシートを芯上に巻いた供給ロール６７を用いた。まず供給ロール６７からシートを引き出し２本の外径１６ｍｍの巻き付けローラ６６の下を通しシート巻き取りロール６８に固定する。この状態で２本の巻き付けロールの間から前記シートを引き出しそのシートの間に被加工円筒材６１を通し被加工円筒材６１の芯金の両端を保持回転させるための回転自在な回転台６４に接続する（図６．Ｂ）。供給ロール６７もしくはシート巻き取りロール６８により前記シートを巻き取ることで前記シートがたるまない状態にする。この時点で面転写部材であるポリイミドシート６２を被加工円筒材６１に約４／５巻き付けた状態となる。前記巻き付けローラは回転自在ではあるが位置は固定されている。
【００９１】
供給ロール６７とシート巻き取りロール６８には、モータが付いており、以上のように装置を設定した後、加熱前の供給ロール６７とシート巻き取りロール６８の間の前記ポリイミドシートの長さを変化させないように前記シートを約２１ｍｍ／ｓｅｃの速度で移動および巻き取りさせながら前記ポリイミドシートの上部より（外側から）前記被加工円筒材を加熱した。本実施例では前記面転写シートより多少長い２８０ｍｍの３ｋＷ出力の赤外線ラインヒータ６５（線集光タイプ；焦点距離ｆ＝５０ｍｍ）を面転写部材である前記シート表面より約４０ｍｍ離して配置し前記シート表面が２７０℃になるまで赤外線ラインヒータにより加熱した（３ｋＷ）。被加工円筒材６１はそれに伴い約２０ｒｐｍの速度で従動回転した。前記シートは供給ロール６７からシート巻き取りロール６８に巻き取られる一方向に流した。このように面転写を行なったところ６０ｓｅｃで面転写および成膜が可能であった。これは面転写部材である前記ポリイミドシートおよび前記フッ素樹脂は赤外線をあまり吸収しないため熱膨張も少なくその上選択的に融着界面が加熱されるため早くなったといえる。
【００９２】
その後、円筒材製品６１６を冷却し前記シートをゆるめた状態にして円筒材製品６１６を回転台６４より取り外した。加熱の際シリコーンゴムの熱膨張が、面転写部材である前記ポリイミドシートより大きいため前記被加工円筒材のシートが巻き付いた部分で、シリコーンゴムがより膨張して、面転写部材と前記円筒状基材との間で前記フッ素樹脂層が加圧された状態を作り出す。また前記赤外線ラインヒータからの熱により前記円筒状基材表層のフッ素樹脂（ＦＥＰ）が軟化し面転写および成膜がなされた。
【００９３】
前記被加工円筒材は回転しているため前記被加工円筒材全面にわたり同様に面転写および成膜が行なわれた。また前記円筒状基材表層のフッ素樹脂は軟化している状態で溶融まではしていない、さらに前記被加工円筒材・円筒材製品とシートの剥離の場所は直接加熱していないため、前記円筒状基材表層のフッ素樹脂は面転写部材である前記シートには付着せずそのため剥離跡も残らなかった。
【００９４】
このようにして得られた円筒材製品６１６表層のフッ素樹脂の焼成膜の表面の粗さは、十点平均粗さ（Ｒｚ）で０．５μｍであり、前記面転写部材の表面模様がフッ素樹脂表面に転写され、かつフッ素樹脂の成膜がなされた。またその際成膜されたフッ素樹脂層表面を電子顕微鏡で観察したところ、表面にクラック等の不良は観察されなかった。また前記円筒状基材のシリコーンゴム層に劣化はみられなかった。また、それぞれの被加工円筒材で加熱前の供給ロール６７とシート巻さ取りロール６８の間の前記ポリイミドシートの長さを変化させないようにシート移動することで円筒状基材の外径のばらつきに関係なく被加工円筒材と面転写部材との隙間を一定にできるため円筒状基材の外径ばらつきによる不良はなくなった。さらにシート供給ロール６７にシートがなくなればシート巻さ取りロール６８から巻き戻して再使用することも可能である。またシート供給ロール６７から巻さ付けロール６６の問でオンラインで前記シートを掃除できるため、常に新しくきれいな面での面転写がおよび成膜可能となった。
【００９５】
本実施例では、面転写部材としてポリイミドシートを用いたが前記フッ素樹脂の焼成成膜時に必要な温度に耐え前記円筒状基材よりも熱膨張の小さいものであれば特に制約はない。鉄・ＳＵＳ・アルミニウム等の金属材料やポリフェニンサルファイド等の耐熱性樹脂を用いてもよい。
【００９６】
（実施例７）
本発明の第７の実施例について（図７）を参照しながら説明する。
【００９７】
７１は最外層にフッ素樹脂を有する被加工円筒材であり、実施例１の被加工円筒材１１とおなじものでありフッ素樹脂層は完全には成膜されておらず、表面にクラック・凹凸等の不良が見られた。またその際フッ素樹脂表面の表面組さは、十点平均粗さ（Ｒｚ）で１５μｍであった。
【００９８】
７２は本発明における面転写部材であり、シート状で前記被加工円筒材当接側には前記円筒状基材上に仮形成されたフッ素樹脂膜に転写したい表面模様が形成されたのもので両端を接続したべルト状のものを用いている。本実施例では、幅２５０ｍｍ、長さ６００ｍｍ、厚み０．０５ｍｍで円筒状基材のシリコーンゴムよりも熱膨の小さいポリイミドシート（４２、５２、６２に同じ）を用いた。また前記被加工円筒材当接側はその面粗さを十点平均粗さ（Ｒｚ）で０．５μｍに加工して用いた。
【００９９】
面転写部材７２である前記ポリイミドベルトはその内側に前記べルトを移動させるためのモータを備え、被加工円筒材７１と平行に設けられた円筒状のシート伸ばし部材７３を入れている。被加工円筒材７１側のべルトは外径１６ｍｍの巻き付けローラ７６の２本間を通して広げてある。このべルトの間に被加工円筒材７１を通し被加工円筒材７１の芯金の両端を保持回転させるための回転自在な回転台７４に接続する（図７．Ｂ）。前記巻き付けローラは回転自在ではあるが位置は固定されている。この状態でシート伸ばし部材７３を移動してシートが前記被加工円筒材にぴたりと付く状態でシート伸ばし部材７３の位置を固定する。この時点で面転写部材であるポリイミドシート７２を前記被加工円筒材７１に約４／５巻き付けた状態となる。
【０１００】
以上のように装置を設定した後、前記ポリイミドシートの上部より（外側から）前記被加工円筒材を加熱した。本実施例では前記面転写シートより多少長い２８０ｍｍの３ｋＷ出力の赤外線ラインヒータ７５（線集光タイプ；焦点距離ｆ＝５０ｍｍ）を面転写部材である前記シート表面より約４０ｍｍ離して配置した。シート伸ばし部材７３に接続したモータにより前記シートを約２１ｍｍ／ｓｅｃの速度で移動させつつ前記シート表面が２７０℃になるまで前記赤外線ラインヒータにより加熱した（３ｋＷ）。被加工円筒材７１はそれに伴い約２０ｒｐｍの速度で従動回転した。前記ベルト接合部が巻き付けローラ７６にかかる前に前記モータを反転させた。約２０ｓｅｃ毎にこの動作を繰り返しながら面転写を行なったところ６０ｓｅｃで面転写および成膜が可能であった。これは面転写部材である前記ポリイミドシートおよび前記フッ素樹脂は赤外線をあまり吸収しなため熱膨張も少なくその上選択的に融着界面が加熱されるため早くなったといえる。
【０１０１】
その後、円筒材製品７１６を冷却し前記シートをゆるめた状態にして円筒材製品７１６を回転台７４より取り外した。加熱の際シリコーンゴムの熱膨張が、面転写部材である前記ポリイミドシートより大きいため前記被加工円筒材のシートが巻き付いた部分で、シリコーンゴムがより膨張して、面転写部材と前記円筒状基材との間で前記フッ素樹脂層が加圧された状態を作り出す。また前記赤外線ラインヒータからの熱により前記円筒状基材表層のフッ素樹脂（ＦＥＰ）が軟化し面転写および成膜がなされた。
【０１０２】
前記被加工円筒材は回転しているため前記被加工円筒材全面にわたり同様に面転写および成膜が行なわれた。また前記円筒状基材表層のフッ素樹脂は軟化している状態で溶融まではしていない、さらに前記被加工円筒材・円筒材製品とシートの剥離の場所は直接加熱していないため、前記円筒状基材表層のフッ素樹脂は面転写部材である前記シートには付着せずそのため剥離跡も残らなかった。
【０１０３】
このようにして得られた円筒材製品７１６表層のフッ素樹脂の焼成膜の表面の粗さは、十点平均粗さ（Ｒｚ）で０．５μｍであり、前記面転写部材の表面模様がフッ素樹脂表面に転写され、かつフッ素樹脂の成膜がなされた。またその際成膜されたフッ素樹脂層表面を電子顕微鏡で観察したところ、表面にクラック等の不良は観察されなかった。また前記円筒状基材のシリコーンゴム層に劣化はみられなかった。また、それぞれの被加工円筒材で加熱前にシート伸ばし部材７３をシートが被加工円筒材にぴったりと付く位置に固定することで円筒状基材の外径のばらつきに関係なく被加工円筒材と面転写部材との隙間を一定にできるため円筒状基材の外径ばらつきによる不良はなくなった。さらに、掃除もしやすく、また装置構成も簡単になった。
【０１０４】
本実施例では、面転写部材としてポリイミドシートを用いたが前記フッ素樹脂の焼成成膜時に必要な温度に耐え前記円筒状基材よりも熱膨張の小さいものであれば特に制約はない。鉄・ＳＵＳ・アルミニウム等の金属材料やポリフェニンサルファイド等の耐熱性樹脂を用いてもよい。
【０１０５】
（参考例１）
参考例１は、実施例３と同じ被加工円筒材を用い、実施例２の手法により同条件で面転写および成膜加工を行なったものである。
【０１０６】
（比較例１）
比較例１は、実施例４と同じ被加工円筒材を用い、面転写部材として、その内径がφ２０．４で厚みが０．０５ｍｍ、長さ２８０ｍｍのポリイミド製の円筒状の面転写部材を用い、前記円筒状の面転写部材の中に被加工円筒材を配し、前記被加工円筒材を２０ｒｐｍで回転させながら前記面転写部材の外側から実施例４と同じ加熱条件で前記赤外線ラインヒータにより加熱し面転写および成膜を行なったものである。この際必要な加工時間は９０ｓｅｃであった。
【０１０７】
（比較例２）
比較例２は、実施例５と同じ被加工円筒材を用い、面転写部材として、その内径がφ２０．４で厚みが０．０５ｍｍ、長さ２８０ｍｍのポリイミド製の円筒状の面転写部材を用い、前記円筒状の面転写部材の中に被加工円筒材を配し、前記被加工円筒材を２０ｒｐｍで回転させながら前記面転写部材の外側から実施例５と同じ加熱条件で前記赤外線ラインヒータにより加熱し面転写および成膜を行なったものである。この際表面の温度は２７０℃では足りず３００℃まで上げる必要があった。
【０１０８】
またそれに伴い加工時間も１８０ｓｅｃかかってしまいそのせいもありゴムの劣化が多少見られた。
【０１０９】
【発明の効果】
以上説明したように、このような手法を用いることで円筒状の面転写部材を用いなくても円筒状基材と面転写部材の熱膨張率の差を利用しフッ素樹脂層を加圧した状態で加熱することが可能となる。このため円筒状の面転写部材では重要であった円筒状基材の外径のばらつきによる被加工円筒材と面転写部材との隙間がばらつくために安定した面転写および成膜が困難になるという問題は、それぞれの被加工円筒材で加熱前に保持治具をシートがたるまない位置に固定することで円筒状基材の外径のばらつきに関係なく被加工円筒材と面転写部材との隙間を一定にできるため解決した。
【０１１０】
また円筒状基材の熱膨張が小さかったり厚みが薄いために、被加工円筒材と面転写部材の隙間を非常に狭くしなければならない場合、円筒状の面転写部材ヘの被加工円筒材の挿入が困難になったり、加工後に円筒材製品が抜けにくくなってしまうということは、シートを巻きつける本方法では、加熱前に被加工円筒材をセットし前記シートを巻き、加工後に前記シートを剥がしてやれば良いため無関係である。また加熱前に前記シート保持治具を前記シートが被加工円筒材にぴたりと付く状態で固定することで被加工円筒材と面転写部材の隙間を非常に狭くできるため、円筒状基材の熱膨張が小さかったり厚みが薄い場合に十分対応できた。
【０１１１】
さらに面転写部材をシート形状にすることで被加工円筒材に面を転写する部分の表面掃除が非常に容易になった。
【図面の簡単な説明】
【図１】実施例１のフッ素樹脂表面に転写部材の表面模様を転写する方法の概略図
Ａ 実施例１の被加工円筒材・円筒材製品の断面図
Ｂ 実施例１の被加工円筒材の取付け方法図
【図２】実施例２のフッ素樹脂表面に転写部材の表面模様を転写する方法の概略図
【図３】実施例３のフッ素樹脂表面に転写部材の表面模様を転写する方法の概略図
Ａ 実施例３の被加工円筒材・円筒材製品の断面図
Ｂ 実施例３の被加工円筒材の取付け方法図
【図４】実施例４のフッ素樹脂表面に転写部材の表面模様を転写する方法の概略図
Ｂ 実施例４の被加工円筒材の取付け方法図
【図５】実施例５のフッ素樹脂表面に転写部材の表面模様を転写する方法の概略図
Ａ 実施例５の被加工円筒材・円筒材製品の断面図
Ｂ 実施例５の被加工円筒材の取付け方法図
【図６】実施例６のフッ素樹脂表面に転写部材の表面模様を転写する方法の概略図(芯金冷却)
Ｂ 実施例６の被加工円筒材の取付け方法図
【図７】実施例７のフッ素樹脂表面に転写部材の表面模様を転写する方法の概略図
Ｂ 実施例７の被加工円筒材の取付け方法図
【符号の説明】
11:被加工円筒材
110:円筒状基材
111:芯金
112:プライマー
113:シリコーンゴム層
114:フッ素ゴム/フッ素樹脂層
115:フッ素樹脂層(予備形成)
116:円筒材製品
117:フッ素樹脂層(成膜後)
12:面転写部材
13:シート保持治具
14:回転台
15:ヒートロール
21:被加工円筒材
216:円筒材製品
22:面転写部材
23:シート保持治具
24:回転台
25:ヒートロール
31:被加工円筒材
310:円筒状基材
311:芯金
312:プライマー
313:シリコーンゴム層
314:フッ素ゴム/フッ素樹脂層
315:フッ素樹脂層(予備形成)
316:円筒材製品
317:フッ素樹脂層(成膜後)
32:面転写部材
33:シート保持治具
34:回転台
35:ヒートロール
36:巻付けローラ
41:被加工円筒材
416:円筒材製品
42:面転写部材
43:シート保持治具
44:回転台
45:赤外線ラインヒータ
46:巻付けローラ
51:被加工円筒材
510:円筒状基材
511:芯金
512:プライマー
513:シリコーンゴム層
514:フッ素ゴム/フッ素樹脂層
515:フッ素樹脂層(予備形成)
516:円筒材製品
517:フッ素樹脂層(成膜後)
52:面転写部材
53:シート保持治具
54:回転台
55:赤外線ラインヒータ
56:巻付けローラ
61:被加工円筒材
62:画転写部材
64:回転台
65:赤外線ラインヒータ
66:巻付けローラ
67:供給ロール
68:巻取りロール
71:被加工円筒材
72:面転写部材
73:シート伸ばし部材
74:回転台
75:赤外線ラインヒータ
76:巻付けローラ[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for coating a fluorocarbon resin on a cylinder and a cylinder, and more particularly to a method suitably applied when manufacturing a fixing member of an electrophotographic image forming apparatus such as a copying machine and an LBP (laser beam printer).
[0002]
[Prior art]
Conventionally, as a method of coating a fluororesin on an elastic roller, a method of covering the elastic roller with a fluororesin tube, or a method of coating a fluororesin powder and a fluororesin dispersion liquid on the elastic roller, followed by heating and firing is used. . When the fluororesin is heated and calcined, a method is employed in which the fluororesin is heated to a melting point of the fluororesin or higher to form a calcined film.
[0003]
The following methods are known as methods for smoothing the surface of the fluororesin.
[0004]
In a method for producing a fixing roller, a method of polishing a surface fluororesin layer and refiring the surface temperature of the fluororesin layer slightly higher than the melting point of the fluororesin (Japanese Patent Publication No. 5-55078). A method of flattening the surface of a fluororesin layer by pressing a high-temperature, smooth pressurized surface against a specific fluororesin layer on a cylindrical substrate (Japanese Patent Application Laid-Open No. 8-118561). In a method of manufacturing a fixing roller, a method is provided in which a fluororesin layer is pressed and smoothed (mirror-finished), then baked and melt-bonded to provide a smooth fluororesin layer surface (Japanese Patent Laid-Open No. 3-80277).
[0005]
In a method of manufacturing a fluororesin-coated roller, a method in which a roller coated with a fluororesin on a rubber elastic body is brought into rotational contact with a heating body, and after melting and cooling, the roller and the heating body are cooled to obtain a smooth surface (Japanese Patent Laid-Open No. Sho 62-62) 227463).
[0006]
In addition, the present inventors previously prepared that a fluororesin was preliminarily prepared on the surface of a cylindrical base material made of metal or the like or a cylindrical base material on which an elastic body was formed by using these as a core metal at the time of firing and forming a film of the fluororesin. A method of forming a film while transferring the surface pattern of the surface transfer member to the surface of the fluororesin by pressing and simultaneously heating the fluororesin with the surface transfer member arranged outside the formed cylindrical material to be processed. (JP-A-9-277378).
[0007]
Further, the present inventors preliminarily formed a fluororesin on the surface of a cylindrical base material made of metal or the like, or a cylindrical base material on which an elastic body was formed by using these as a core metal at the time of firing and forming a film of the fluororesin. Pressurizing and simultaneously heating the fluororesin by arranging a cylindrical surface transfer member outside the processed cylindrical material and directly heating the surface from the outside of the surface transfer member using an infrared heater as a heating means. Has also proposed a method of forming a film while transferring the surface pattern of the surface transfer member on the surface of the fluororesin.
[0008]
[Problems to be solved by the invention]
First, the fluorine resin coating method as in the conventional example has the following problems.
[0009]
First, when a fluororesin is coated on an elastic body and fired and fired, the melt viscosity of the fluororesin is extremely high. Low smoothness of resin layer.
[0010]
In addition, when the fluororesin firing conditions as described above are performed, there is no elastic body that can withstand the temperature, resulting in extremely large damage to the elastic body.
[0011]
With the aim of solving the above, the present inventors pressurized the fluororesin layer between the elastic body and the surface transfer member disposed outside the fluororesin layer, and designed the surface pattern of the surface transfer member. While transferring the film onto the surface of the fluororesin, a method of performing the heating and baking of the fluororesin was proposed. As a result, while controlling the surface pattern of the fluororesin, the fluororesin can be formed at a lower temperature than in the past, and the damage of the rubber as the base material can be relatively suppressed. .
[0012]
Furthermore, the present inventors have proposed a method in which a cylindrical substrate made of metal or the like, or a cylindrical substrate in which an elastic body is formed on the surface of a core metal and a fluororesin is preliminarily formed on the surface of a cylindrical material is used. By disposing a surface transfer member in the shape of a circle and using an infrared heater as a heating means to heat the direct surface of the cylindrical material to be processed from the outside of the surface transfer member, it is possible to suppress the damage of the rubber as the lower material. Was.
[0013]
However, the method using the cylindrical surface transfer member has the following three problems.
[0014]
First, a cylindrical surface transfer member is required as the surface transfer member, and the inner diameter of the surface transfer member is determined by the outer diameter of the cylindrical material to be processed and the outer diameter of the cylindrical base material. Range. First, it is necessary to have an inside diameter enough to receive the cylindrical material to be processed. Also, if the inner diameter is too large, even if the cylindrical substrate expands during heating, the fluororesin layer cannot be sufficiently pressed with the surface transfer member, and the surface transfer will not be performed. Therefore, it is not possible to make the inner diameter too large to increase the gap. For this reason, when the outer diameter of the cylindrical base material varies during mass production or the like, stable surface transfer and film formation become difficult.
[0015]
Next, the gap between the inner diameter of the surface transfer member and the cylindrical material to be processed is when the thermal expansion of the cylindrical base material is small, or when the thickness of the cylindrical base material to be thermally expanded is small, the gap is It has to be very narrow. For this reason, if stable surface transfer and film formation are to be performed, it is actually difficult to insert the cylindrical material to be processed into the surface transfer member, or the cylindrical material product after processing becomes difficult to come off. There is.
[0016]
Still another problem is that the inner surface of the surface transfer member is very important in the processing method, but since the surface transfer member is almost axially long with respect to the opening, it is difficult to clean the inner surface. is there.
[0017]
An object of the present invention is to solve the above-mentioned problems, that is, to have the same effect as the method using the cylindrical surface transfer member, and the outer diameter and inner diameter of the cylindrical material to be surface-transferred By the surface transfer member as much as possible, and by reducing the restrictions due to the gap between the functional portion of the surface transfer member and the cylindrical material to be processed, even when the outer diameter of the cylindrical base material varies, stable surface transfer and An object of the present invention is to develop a method that enables film formation and facilitates cleaning of a functional portion of the surface transfer member.
[0018]
[Means for Solving the Invention]
The present invention provides, for a processed cylindrical material in which a fluororesin layer capable of surface processing is preformed on a cylindrical substrate, a fluororesin layer on the cylindrical substrate, and disposed outside the fluororesin layer. By heating the fluororesin layer in a pressurized state by using a difference in thermal expansion coefficient between the cylindrical base material and the surface transfer member between the surface transfer member, the surface pattern of the surface transfer member is changed. A fluororesin to be transferred to the surface of the fluororesin layer Transfer the surface pattern of the transfer member to the surface In the method, a sheet-shaped material having a smaller coefficient of thermal expansion than the cylindrical base material is used as the surface transfer member, and the sheet is wound about 1/3 or more of the circumference of the cylindrical material to be processed before heating. In this state, both ends of the sheet are fixed to a sheet holding jig such that the other end relatively moves by the amount of movement of one end, and the position of the holding jig in a state where the sheet is stretched. Is fixed, and the cylindrical member is heated from the outside of the sheet while the sheet is driven while rotating while the shaft of the cylindrical member is rotatably fixed.
[0019]
In the following, the “cylindrical substrate” refers to an inner portion that does not include the fluororesin layer, and when the surface is an elastic body, a further inner rigid portion is referred to as a “core metal”. The preformed fluorocarbon resin before heating and pressurizing is called "cylindrical material to be processed", and the one after film formation is called "cylindrical product".
[0020]
When such a method is used, the diameter of the cylindrical substrate increases due to thermal expansion, whereas the sheet has a low coefficient of thermal expansion and has both ends fixed by the holding jig. Therefore, the fluororesin layer on the surface of the cylindrical substrate is heated in a pressurized state, and the surface pattern of the surface transfer member is transferred to the surface of the fluororesin layer without deteriorating the base layer. The film can be formed while being formed. Since the cylindrical material to be processed is rotating, surface transfer and film formation are similarly performed over the entire surface of the cylindrical material to be processed. Further, the fluororesin on the surface layer of the cylindrical material to be processed is softened and not melted. Further, since the temperature of the place where the cylindrical material to be processed and the sheet are separated suddenly drops unless directly heated, the fluororesin of the surface layer of the cylindrical material to be processed does not adhere to the sheet which is a surface transfer member, and therefore, No trace of peeling remains.
[0021]
By using such a method, the fluororesin layer is heated in a pressurized state using a difference in the coefficient of thermal expansion between the cylindrical base material and the surface transfer member without using a cylindrical surface transfer member. It becomes possible. For this reason, the gap between the cylindrical member to be processed and the surface transfer member varies due to the variation in the outer diameter of the cylindrical substrate, which is important for the cylindrical surface transfer member. The problem is that by fixing a holding jig to a position where the sheet does not sag before heating in each of the processed cylindrical materials, the surface of the processed cylindrical material and the processed cylindrical material are fixed regardless of the variation in the outer diameter of the cylindrical base material. The problem is solved because the gap with the transfer member can be made constant.
Further, when the gap between the cylindrical member to be processed and the surface transfer member must be very small because the thermal expansion of the cylindrical base material is small or the thickness is small, the coating on the cylindrical surface transfer member is required. The problem that the insertion of the processed cylindrical material becomes difficult or the cylindrical material product becomes difficult to remove after the processing is performed by the method of winding a sheet, in which the processed cylindrical material is set before heating and the sheet is wound. This is irrelevant because the sheet may be peeled off after processing. Further, by fixing the sheet holding jig before heating so that the sheet is tightly attached to the cylindrical member to be processed, the gap between the cylindrical member to be processed and the surface transfer member can be extremely narrowed. It can sufficiently cope with the case where the thermal expansion of the base material is small or the thickness is thin.
Further, by making the surface transfer member into a sheet shape, it is very easy to clean the surface of the portion where the surface is transferred to the cylindrical material to be processed.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
The configuration of the apparatus used in the embodiment of the present invention, in particular, members and processing materials will be described (see FIGS. 1 to 7).
[0023]
First, a cylindrical material to be processed will be described. Reference numerals 11, 21, 31, 41, 51, 61, and 71 denote cylindrical materials to be processed used in the respective examples (Examples 1 to 7 in order), and a fluororesin layer (115, 315, 515, or the like) as an outermost layer. Have. As the fluororesin, a tetrafluoroethylene-hexafluoropropylene copolymer (FEP) was used in Examples, but a tetrafluoroethylene / perfluoroalkylvinyl ether copolymer (PFA) and polytetrafluoroethylene (PTFE) were also used. ), Tetrafluoroethylene-ethylene copolymer (ETFE), polyvinylidene fluoride (PVdF), polychlorotrifluoroethylene (PCTFE), and the like. As a method of coating these fluororesin powders and the water-based paint containing the powder, in addition to the method of spray-coating the dispersion as in the examples, in the case of the water-based paint, dip coating, roller coating, blade There are coatings and the like, and in the case of powder, electrostatic powder coating and the like. The coated fluororesin layer is in a state in which the fluororesin agglomerates in the form of fine particles to form a layer after drying in the case of an aqueous paint and after powder coating.
[0024]
After coating, the fluororesin layer may be preliminarily heated and fired to form a film. It is sufficient to temporarily raise the melting temperature of the fluororesin to the preliminary heating and firing of the fluororesin, but it may be performed until the fluororesin is completely formed into a film. At this time, cracks and irregularities may be present on the surface of the fluororesin. Further, the temperature of the fluororesin layer in the step of pressing and heating the fluororesin after the preliminary heating and sintering with the cylindrical substrate and the surface transfer body is not particularly limited as long as it is 200 ° C. or higher. There is no need to raise the temperature, and it is preferable to heat to 240 ° C to 300 ° C. By using this method, an arbitrary surface pattern can be imparted to the fluororesin with a smaller amount of heat than when preheating and firing are not performed. When a material having no heat resistance such as resin or rubber is used as the cylindrical base material, thermal deterioration of the cylindrical base material occurs when the fluororesin is heated and fired. Thermal deterioration of the substrate can be prevented. In addition, since a high temperature is not required at the time of pressurizing the fluororesin layer, work efficiency is high.
[0025]
The material of the inner cylindrical substrate (110, 310, 510) of the fluororesin layer is not particularly limited as long as it has appropriate strength and heat resistance, but is preferably a metal such as nickel, iron or aluminum. , A heat-resistant resin such as polyimide, or the above-mentioned metal or resin as a core metal (111, 311, 511), and a primer (112, 114, 312, 314, 512, 514) on its surface, and / or silicone rubber / fluorine rubber A heat-resistant rubber (113, 313, 513) is used, and particularly preferred is a structure of an aluminum core metal-primer-silicone rubber-fluoro rubber / fluoro resin mixed primer (fluoro resin layer) shown below. (See FIGS. 1.A, 3.A, and 5.A).
[0026]
The core metal may be a cylinder or a hollow cylinder, and its diameter is preferably 65 to 90% of the entire cylindrical substrate (111, 311 and 511).
[0027]
The thickness of the silicone rubber layer (113, 313, 513) is substantially equal to the difference between the radius of the entire cylindrical substrate and the radius of the cored bar. Examples of the method of forming the silicone rubber layer include a method of inserting a core coated with a primer into a cylindrical mold, injecting unvulcanized silicone rubber of LTV, and heating and curing the silicone rubber. .
[0028]
The primer layer (114, 314, 514) for bonding the silicone rubber layer and the surface fluororesin layer is composed of a mixture of fluororubber and fluororesin. For example, a water-based paint of the mixture is applied by spraying and heated. And curing.
[0029]
The processed cylindrical material (116, 216, 316, 416, 516, 616, 716) is the same as the processed cylindrical material in the drawing. Also, the fluororesin films (117, 317, 517) after film formation are the same as before processing in the drawing.
[0030]
Next, the surface transfer member will be described. Reference numerals 12, 22, 32, 42, 52, 62 and 72 are surface transfer members used in the respective embodiments.
[0031]
These are sheet-shaped or belt-shaped with both ends joined to each other, and have a surface pattern to be transferred to a fluororesin film formed on the cylindrical base material formed on the side of the cylindrical material to be processed, which is U. It is bent into a letter. The material is not particularly limited as long as it can withstand the required temperature at the time of film formation by firing the fluororesin and has a smaller thermal expansion than the cylindrical base material, but metal materials such as iron, SUS, aluminum, and polyimides -It is preferable to use a heat-resistant resin such as polyphenine sulfide. Since the surface roughness of the cylindrical base material contact side is an important factor that determines the surface roughness of the surface of the cylindrical product (116, 316, 516) at the time of finishing, a sufficiently small value is desirable. It is. For example, the ten-point average roughness (Rz) is preferably 0.5 μm.
[0032]
The winding of the sheet-shaped surface transfer member around the cylindrical material to be processed is preferably 1/3 or more of the circumference. This is because the force due to the difference in the coefficient of thermal expansion is not sufficiently used to press the fluororesin layer on the surface of the cylindrical base material without a certain degree of winding. .
[0033]
The length of the sheet may be long enough to feed in one direction following the rollers during heating, but in practice, the roller is rotated at about 20 rpm with a φ20 mm cylindrical workpiece, and the heating time is about 150 seconds. Therefore, it is about 3.5m. In this case, the apparatus becomes very large, so a sheet having a length of about 600 mm may be used, and the sheet may be driven while the roller rotation is reversed several times.
[0034]
Further, as a holding means of the surface transfer member, typically, like 13, 23, 33, 43, 53, one end is moved by one end for fixing both ends of the sheet. There is a sheet holding jig whose ends move relatively, and a rack and pinion mechanism is used. A seesaw mechanism is also used.
[0035]
Both ends of the cylindrical material to be processed are connected to a turntable by cores 111, 311 and 511. The rotary table corresponds to 14, 24, 34, 44, 54, 64, 74. Here, since the processed cylindrical material and the sheet can follow each other, the motor is attached to one of them and the other is driven.However, it is more preferable to move the sheet and follow the processed cylindrical material. More preferred. If the sheet is driven by rotating the cylindrical member to be processed (FIG. 1.B), the rotation of the cylindrical member attempts to move a sheet holding jig having a large inertia. Slip is likely to occur between the material surface and the sheet, which may cause scratches on the surface of the cylindrical material to be processed. Therefore, by moving the sheet and following the cylindrical material having a small inertia to prevent slipping, the surface of the fluororesin without any scratches on the surface of the cylindrical material to be processed has an arbitrary pattern and roughness. Can be applied (FIG. 2.B).
[0036]
When the sheet is wound around the cylindrical material to be processed, winding rollers (36, 46, 56, 66 and 76) can be used. (FIG. 3.B) Thereby, it becomes easy to wind the sheet of the surface transfer member by 1/2 or more around the circumference of the cylindrical material to be processed, and therefore, the force due to the difference in the coefficient of thermal expansion is sufficiently large. It is used for pressurizing the fluororesin layer on the surface of the cylindrical substrate, and the load on the shaft of the cylindrical material to be processed is reduced, so that the deformation of the shaft and the resulting surface transfer and film formation in the axial center portion are reduced. Failure can be prevented.
[0037]
As the heating means, aluminum heat rolls such as those shown in 15, 25, and 35 are typical, and they contact the cylindrical material to be processed from above a stainless steel sheet.
[0038]
Basically, by the means as described above, it is possible to impart an arbitrary pattern and roughness to the surface of the fluororesin, which has conventionally been difficult to control the surface pattern and the roughness while solving the above problems. .
[0039]
Using an infrared heater (45, 55, 65, 75), the cylindrical member to be processed is heated from the outside of the surface transfer member, and the fluorine resin is pressed between the cylindrical member to be processed and the surface transfer member; When the method of transferring the surface pattern of the surface transfer member to the surface of the fluororesin and forming the film is used (FIGS. 4 to 7), even if the temperature applied at the time of firing and forming the fluororesin is set low, Film formation can be easily performed. In addition, since the fluororesin on the surface can be directly heated and rapid heating is possible, the deterioration of the base layer at that time can be suppressed.
[0040]
When a thin sheet of polyimide is used as the surface transfer member (42, 52, 62, 72), various favorable effects are obtained as described below (FIGS. 4 to 7). First, it is excellent in heat resistance and strength at high temperatures, so that it can be used repeatedly and the durability of the surface transfer member is improved. Further, since it is very flexible and easily adheres to the cylindrical base material (41 and others) and the winding roller (46 and others), processing is easy.
[0041]
By transmitting infrared rays to a certain extent, the corresponding energy reaches the fluororesin, and the energy required for heating can be saved. Further, since the surface transfer member does not warm much, it is possible to transfer and form the surface of the surface transfer member to a fluororesin surface formed on the cylindrical substrate surface with less energy by reducing thermal expansion. it can. That is, thermal deterioration of rubber can be further suppressed.
[0042]
Further, the sheet 62, which is the surface transfer member, is supplied in a state of being wound around a roll 67, and the sheet is wound around at least half the circumference of the cylindrical material 61 to be processed before heating so that the sheet does not sag. In the stretched state, the roll 68 on the winding side and the roll 67 on the supply side are once fixed, and the cylindrical material to be processed is driven and rotated while the sheet supply and winding speeds are the same at the time of heating. Heating can be performed while the fluororesin layer on the surface of the cylindrical member is pressed (FIG. 6). Since a new sheet surface can always be supplied, the surface condition is improved, and since the sheet 62 may be fed in one direction, the device configuration is simplified.
[0043]
Further, the sheet 72 has a belt shape in which a part thereof is connected, and can be rotated in a cylindrical shape provided in parallel with the cylindrical material to be processed in a state of being wound in a circumferential direction of the cylindrical material 71 before heating. If the sheet is stretched to such an extent that the tension is applied by the simple sheet stretching member 73 or not to the extent that the sheet is stretched (FIG. 7), a complicated sheet holding jig such as the rack and pinion or the seesaw mechanism is used. Even without using a tool, it is possible to move the sheet while following the cylindrical member to be processed by rotating the sheet stretching member and performing forward / reverse movement so that the joint portion of the sheet does not contact the cylindrical member to be processed. The surface of the surface transfer member can be transferred and formed on the surface of the fluororesin formed on the surface of the cylindrical substrate with a simple apparatus configuration.
[0044]
【Example】
(Example 1)
A first embodiment of the present invention will be described with reference to FIG.
[0045]
Reference numeral 11 denotes a cylindrical material to be processed having a fluororesin in the outermost layer, the outer diameter of which is 20 mm, and the length in the axial direction is 230 mm. The cross section is shown in FIG. 1.A. Reference numeral 111 denotes a metal core of the cylindrical substrate 110, which is made of aluminum and has a diameter of 13 mm. A silicone rubber layer 113 of LTV is adhered to the core metal 111 via a primer layer 112 made of Dow Corning Silicone Toray Co., Ltd., trade name: DY39-051, and its thickness is about 3.5 mm. . For the silicone rubber layer, a core coated with a primer is inserted into a cylindrical mold, and LTV unvulcanized silicone rubber (manufactured by Toray Dow Corning Silicone, trade name: DY35-561) is injected. It was formed by heat curing. Reference numeral 114 denotes a primer layer for bonding the silicone rubber layer 113 and the surface fluororesin layer, and is composed of a mixture of fluororubber and fluororesin (FEP). The primer layer 114 is obtained by applying a water-based paint (product name: Daiel GLS-213, manufactured by Daikin Co., Ltd.) made of a mixture of a fluororubber and a fluororesin by spraying and heating and curing at 200 ° C. for 30 minutes. Was 25 μm. On the primer layer 114, a fluororesin (FEP) layer 115 is formed. The fluororesin layer 115 is sprayed with a fluororesin (FEP) dispersion (manufactured by Daikin Co., trade name: NEOFLON FEP ND-1), dried at 150 ° C for 20 minutes, and then preheated at 300 ° C for 20 minutes. It was fired, and the thickness at that time was 15 μm. At that time, the fluororesin layer was not completely formed, and defects such as cracks and irregularities were observed on the surface. At that time, the surface roughness of the fluororesin surface was 15 μm in terms of ten-point average roughness (Rz).
[0046]
Reference numeral 12 denotes a surface transfer member according to the present invention, which is a sheet-like member having a surface pattern to be transferred to a fluororesin film temporarily formed on the cylindrical substrate on the side of the cylindrical material to be processed, which is U. It is bent into a letter. In this example, a stainless steel sheet (SUS304-H) having a width of 250 mm, a length of 600 mm, and a thickness of 0.05 mm and having a smaller thermal expansion than the silicone rubber of the cylindrical base material was used. The surface of the cylindrical material contacting side was processed to have a surface roughness of 0.5 μm as a ten-point average roughness (Rz).
[0047]
The both ends of the surface transfer member 12 are fixed to a sheet holding jig 13 in which the other end relatively moves by the movement of one end. In the present embodiment, a rack and pinion mechanism as shown in FIG. 1 is used. First, the cylindrical member 11 is passed through the surface transfer member 12 and the sheet holding jig 13, and both ends of the core bar 111 are connected to a turntable 14 having a motor for holding and rotating the cylindrical member 11. (FIG. 1.B). In this state, the sheet holding jig 13 is moved, and the position of the sheet holding jig 13 is fixed in a state where the sheet is stretched so as not to slack. In this embodiment, since the interval between the cylindrical member 11 to be processed and the sheet fixing portion of the sheet holding jig 13 is substantially the same, the winding of the sheet is about 1/2 of the cylindrical member to be processed.
[0048]
After setting the apparatus as described above, an aluminum heat roll 15 (outer diameter 40 mm, length 300 mm) was brought into contact with the cylindrical material to be processed from above the stainless steel sheet (FIG. 1), and the heat roll 15 was set to 270. The cylindrical material 11 to be processed was rotated at a speed of 20 rpm by the motor while being heated to ° C. The sheet was driven by the cylindrical material to be processed. The motor is reversed before the edge of the sheet reaches the limit of the sheet holding jig. The surface transfer and the film formation were performed for 150 seconds while repeating this operation about every 20 seconds. Thereafter, the cylindrical product 116 was cooled, the sheet holding jig 13 was moved, and the sheet was loosened to remove the cylindrical product 116 from the turntable 14. At the time of heating, the thermal expansion of the silicone rubber is larger than the stainless steel sheet as the surface transfer member, so that at the portion where the sheet of the cylindrical material to be processed is wound, the silicone rubber expands more, and the surface transfer member and the A state in which the fluororesin layer is pressurized is created in relation to the cylindrical substrate. Further, the heat from the heat roll softened the fluororesin (FEP) on the surface layer of the cylindrical base material, so that surface transfer and film formation were performed.
[0049]
Since the cylindrical material to be processed is rotating, surface transfer and film formation were similarly performed over the entire surface of the cylindrical material to be processed. In addition, since the fluororesin of the surface layer of the cylindrical base material is not melted in a softened state, and furthermore, the place where the processed cylindrical material / cylindrical material product is separated from the sheet is not directly heated, so The fluororesin of the surface layer of the base material did not adhere to the sheet as the surface transfer member, so that no trace of peeling was left.
[0050]
The surface roughness of the fired fluororesin film 117 on the surface layer of the cylindrical product 116 obtained in this way is 0.5 μm in ten-point average roughness (Rz), and the surface pattern of the surface transfer member is fluorine. The film was transferred to the resin surface and a fluororesin film was formed. In addition, when the surface of the formed fluororesin layer was observed with an electron microscope, no defects such as cracks were observed on the surface. No deterioration was observed in the silicone rubber layer of the cylindrical substrate. In addition, by fixing the holding jig to a position where the sheet does not sag before heating in each of the processed cylindrical members, regardless of the variation in the outer diameter of the cylindrical base material, the processing cylindrical member and the surface transfer member can be fixed. Since the gap can be made constant, defects due to variations in the outer diameter of the cylindrical substrate have been eliminated.
[0051]
In addition, the sheet shape makes cleaning easier.
[0052]
(Example 2)
A second embodiment of the present invention will be described with reference to FIG.
[0053]
Reference numeral 21 denotes a cylindrical material to be processed having a fluororesin in the outermost layer, which is the same as the cylindrical material 11 to be processed in Example 1, in which the fluororesin layer is not completely formed, and cracks and irregularities are formed on the surface. Failure was seen. At this time, the surface roughness of the fluororesin surface was 15 μm in terms of ten-point average roughness (Rz).
[0054]
Reference numeral 22 denotes a surface transfer member similar to that of the first embodiment, and the surface of the cylindrical material contacting side is processed to have a ten-point average roughness (Rz) of 0.5 μm. Both ends of the surface transfer member 22 are fixed to a sheet holding jig 23 in which the other end relatively moves by the movement of one end. In this embodiment, a rack and pinion mechanism in which a motor for reciprocating the rack is connected to a pinion gear as shown in FIG. 2 is used. First, the cylindrical member 21 to be processed is passed between the surface transfer member 22 and the sheet holding jig 23 and connected to a rotatable rotary table 24 for holding and rotating both ends of the core metal of the cylindrical member 21 to be processed (FIG. 2). .B). In this state, the sheet holding jig 23 is moved, and the position of the sheet holding jig 23 is fixed in a state where the sheet is stretched so as not to slack. In this embodiment, since the interval between the cylindrical member 21 to be processed and the sheet fixing portion of the sheet holding jig 23 is almost the same, the winding of the sheet is about 1/2 of the cylindrical member to be processed.
[0055]
After setting the apparatus as described above, an aluminum heat roll 25 (outer diameter: 40 mm, length: 300 mm) was brought into contact with the cylindrical material to be processed from above the stainless steel sheet (FIG. 2), and the heat roll 25 was set to 270. The sheet was moved at a speed of about 21 mm / sec by a motor connected to the sheet holding jig 23 while heating to a temperature of ° C. The cylindrical material to be processed 21 was accordingly driven to rotate at a speed of about 20 rpm. The motor was reversed before the edge of the sheet reached the limit of the sheet holding jig. The surface transfer and the film formation were performed for 150 seconds while repeating this operation about every 20 seconds. Thereafter, the cylindrical material product 216 was cooled, the sheet holding jig 23 was moved to loosen the sheet, and the cylindrical material product 216 was removed from the turntable 24. At the time of heating, the thermal expansion of the silicone rubber is larger than the stainless steel sheet as the surface transfer member, so that at the portion where the sheet of the cylindrical material to be processed is wound, the silicone rubber expands more, and the surface transfer member and the A state in which the fluororesin layer is pressurized with the cylindrical substrate is created. Further, the heat from the heat roll softened the fluororesin (FEP) on the surface layer of the cylindrical base material, so that surface transfer and film formation were performed.
[0056]
Since the cylindrical material to be processed is rotating, surface transfer and film formation were similarly performed over the entire surface of the cylindrical material to be processed. Further, since the fluororesin of the cylindrical base material surface layer is not melted in a softened state, and furthermore, the place where the sheet to be processed and the cylindrical material product and the sheet are separated is not directly heated, The fluororesin of the surface layer of the cylindrical substrate did not adhere to the sheet as the surface transfer member, and thus no trace of peeling was left.
[0057]
The surface roughness of the calcined film of the fluororesin thus obtained is 0.5 μm in ten-point average roughness (Rz), and the surface pattern of the surface transfer member is transferred to the fluororesin surface; In addition, a film of fluororesin was formed. In addition, when the surface of the formed fluororesin layer was observed with an electron microscope, no defects such as cracks were observed on the surface. No deterioration was observed in the cylindrical base silicone rubber layer. In addition, by fixing the holding jig to a position where the sheet does not sag before heating in each of the cylindrical materials to be processed, the gap between the cylindrical material to be processed and the surface transfer member regardless of the variation in the outer diameter of the cylindrical base material. Can be kept constant, thereby eliminating defects due to variations in the outer diameter of the cylindrical substrate.
[0058]
In addition, the sheet shape makes cleaning easier.
[0059]
Further, in the case of the first embodiment, since the cylindrical member to be processed is rotated to move the sheet and the rack having a large inertia, a slip easily occurs between the cylindrical member to be processed and the sheet, and the surface of the fluororesin is damaged. Was easy to occur. However, in this embodiment, since the workpiece to be driven is the cylindrical material having a small inertia, no slip or scratch is generated.
[0060]
(Example 3)
A third embodiment of the present invention will be described with reference to FIG.
[0061]
Reference numeral 31 denotes a cylindrical material to be processed having a fluororesin in the outermost layer, the outer diameter of which is 20 mm, and the length in the axial direction is 230 mm. The sectional view is shown in FIG. 3.A. Reference numeral 311 denotes a metal core of the cylindrical base material 310, which is made of aluminum and has a diameter of 13 mm, but is hollow and has a hole with a diameter of 11 mm. An LTV silicone rubber layer 313 is adhered to the core metal 311 via a primer layer 312 (the same raw material as that of the above-mentioned 112), and its thickness is about 3.5 mm. The silicone rubber layer was formed by inserting a core coated with a primer into a cylindrical mold, injecting unvulcanized silicone rubber of LTV (same as 113), and heating and curing it. Reference numeral 314 denotes a primer layer for bonding the silicone rubber layer 313 and the surface fluororesin layer, and is composed of a mixture of fluororubber and fluororesin (FEP). The primer layer 314 was obtained by spraying an aqueous paint composed of a mixture of a fluororubber and a fluororesin and heating and curing at 200 ° C. for 30 minutes, and its thickness was 25 μm. On the primer layer 314, a fluororesin (FEP) layer 315 is formed. The fluororesin layer 315 is formed by applying a fluororesin (FEP) dispersion (same as 115) by spraying, drying at 150 ° C. for 20 minutes, and preheating and firing at 300 ° C. for 20 minutes. Had a thickness of 15 μm. At that time, the fluororesin layer was not completely formed, and defects such as cracks and irregularities were observed on the surface. At that time, the surface roughness of the fluororesin surface was 15 μm in terms of ten-point average roughness (Rz).
[0062]
Reference numeral 32 denotes a surface transfer member similar to that of the first embodiment, and the surface of the cylindrical material contacting side is processed to have a ten-point average roughness (Rz) of 0.5 μm. The both ends of the surface transfer member 32 are fixed to a sheet holding jig 33 in which the other end relatively moves by the movement of one end. In the present embodiment, a rack and pinion mechanism in which a motor for reciprocating the rack is connected to a pinion gear as shown in FIG. First, the cylindrical member 31 to be processed is passed between the surface transfer member 32 and the sheet holding jig 33 and connected to a rotatable rotary table 34 for holding and rotating both ends of the core metal 311 of the cylindrical member 31 to be processed (FIG. 3.B). In this embodiment, in this state, the stainless steel sheet 32 as the surface transfer member was wound about 4/5 around the cylindrical material 31 using two winding rollers 36 having an outer diameter of 16 mm. The winding roller is rotatable but its position is fixed. In this state, the sheet holding jig 33 is moved and the position of the sheet holding jig 33 is fixed in a state where the sheet is stretched so as not to slack.
[0063]
After setting the apparatus as described above, an aluminum heat roll 35 (outer diameter 40 mm, length 300 mm) was brought into contact with the cylindrical material to be processed from above the stainless steel sheet (FIG. 3), and The sheet was moved at a speed of about 21 mm / sec by a motor connected to the sheet holding jig 33 while being heated to ° C. The cylindrical material 31 to be processed was driven and rotated at a speed of about 20 rpm. The motor is reversed before the edge of the sheet reaches the limit of the sheet holding jig. When the surface transfer was performed while repeating this operation about every 20 seconds, the surface transfer and the film formation were possible in 90 seconds. Thereafter, the cylindrical product 316 was cooled, and the sheet holding jig 33 was moved to loosen the sheet, and the cylindrical product 316 was removed from the turntable 34. At the time of heating, the thermal expansion of the silicone rubber is larger than the stainless steel sheet as the surface transfer member, so that at the portion where the sheet of the cylindrical material to be processed is wound, the silicone rubber expands more, and the surface transfer member and the A state in which the fluororesin layer is pressurized with the cylindrical substrate is created. Further, the heat from the heat roll softened the fluororesin (FEP) on the surface layer of the cylindrical base material, so that surface transfer and film formation were performed.
[0064]
Since the cylindrical material to be processed is rotating, surface transfer and film formation were similarly performed over the entire surface of the cylindrical material to be processed. Further, since the fluororesin of the cylindrical base material surface layer is not melted in a softened state, and furthermore, the place where the sheet to be processed and the cylindrical material product and the sheet are separated is not directly heated, The fluororesin of the surface layer of the cylindrical substrate did not adhere to the sheet as the surface transfer member, and thus no trace of peeling was left.
[0065]
The surface roughness of the fluororesin fired film 317 thus obtained is 0.5 μm in ten-point average roughness (Rz), and the surface pattern of the surface transfer member is transferred to the fluororesin surface. And a fluororesin film was formed. In addition, when the surface of the formed fluororesin layer was observed with an electron microscope, no defects such as cracks were observed on the surface. No deterioration was observed in the silicone rubber layer of the cylindrical substrate.
[0066]
In addition, by fixing the holding jig to a position where the sheet does not sag before heating in each of the processed cylindrical members, regardless of the variation in the outer diameter of the cylindrical base material, the processing cylindrical member and the surface transfer member can be fixed. Since the gap can be made constant, defects due to variations in the outer diameter of the cylindrical substrate have been eliminated. In addition, the sheet shape makes cleaning easier.
[0067]
Further, in the methods of Examples 1 and 2, if the strength of the cored bar is not sufficient, the surface transfer at the axially central portion of the processed cylindrical material may be insufficient. Therefore, Table 1 below shows the evaluation results of the strength (core thickness) of the core metal of the cylindrical base material and the surface transfer state at the axial center of the cylindrical material to be processed.
[0068]
From the results, it is better to wind the sheet around the cylindrical material to be processed by using the winding roller as in the present embodiment, and to apply a force generated by a difference in thermal expansion between the cylindrical base material and the surface transfer member to the surface layer. It can be seen that since a large amount can be converted by the force, the load applied to the core metal of the cylindrical base material is reduced, and even if the core metal strength is weak, the surface transfer and film formation at the central portion in the axial direction of the processed cylindrical material are not insufficient.
[0069]
[Table 1]

(Example 4)
A fourth embodiment of the present invention will be described with reference to FIG.
[0070]
Reference numeral 41 denotes a cylindrical material to be processed having a fluororesin in the outermost layer, which is the same as the cylindrical material to be processed 11 of Example 1, in which the fluororesin layer is not completely formed, and the surface has cracks and irregularities. Failure was seen. At that time, the surface composition of the fluororesin surface was 15 μm in terms of ten-point average roughness (Rz).
[0071]
Reference numeral 42 denotes a surface transfer member according to the present invention, which is a sheet-shaped member having a surface pattern to be transferred to a fluororesin film temporarily formed on the cylindrical base material on the side of the cylindrical material to be processed, which is U-shaped. It is bent into a letter. In this example, a polyimide sheet (manufactured by Toray DuPont, trade name: Kapton 200H) having a width of 250 mm, a length of 600 mm, and a thickness of 0.05 mm and having a smaller thermal expansion than the silicone rubber of the cylindrical base material was used. The surface of the cylindrical material contacting side to be processed was processed to have a surface roughness of 0.5 μm in ten-point average roughness (Rz).
[0072]
The both ends of the surface transfer member 42 are fixed to a sheet holding jig 43 such that the other end relatively moves by the movement of one end. In this embodiment, a rack-and-pinion mechanism in which a motor for reciprocating the rack is connected to a pinion gear as shown in FIG. First, the cylindrical member 41 to be processed is passed between the surface transfer member 42 and the sheet holding jig 43 and connected to a rotatable rotary table 44 for holding and rotating both ends of the core of the cylindrical member 41 to be processed (FIG. 4). .B). In this embodiment, in this state, the polyimide sheet 42 as the surface transfer member is wound about 4/5 around the cylindrical material 41 to be processed by using two winding rollers 46 having an outer diameter of 16 mm. The winding roller is rotatable but its position is fixed. In this state, the sheet holding jig 43 is moved to fix the position of the sheet holding jig 43 in a state where the sheet sticks to the cylindrical member to be processed.
[0073]
After setting the apparatus as described above, the cylindrical material to be processed was heated from above (from outside) the polyimide sheet. In this embodiment, an infrared line heater 45 (line condensing type; focal length f = 50 mm) of 280 mm and 3 kW output slightly longer than the surface transfer sheet is arranged at a distance of about 40 mm from the surface of the sheet as a surface transfer member. The sheet was moved at a speed of about 21 mm / sec by a motor connected to the sheet holding jig 43, and heated by the infrared line heater until the sheet surface reached 270 ° C. (3 kW). The cylindrical member 41 to be processed was accordingly rotated at a speed of about 20 rpm. The motor is reversed before the edge of the sheet reaches the limit of the sheet holding jig. When this operation was repeated about every 20 seconds to perform surface transfer, surface transfer and film formation were possible in 60 seconds. This can be said that the polyimide sheet and the fluororesin, which are surface transfer members, do not absorb much infrared rays and thus have little thermal expansion, and furthermore, the fusion interface is selectively heated, so that the speed is faster. Thereafter, the cylindrical product 416 was cooled, the sheet holding jig 43 was moved, and the sheet was loosened to remove the cylindrical product 416 from the turntable 44. When heated, the thermal expansion of the silicone rubber is larger than the polyimide sheet, which is a surface transfer member, so that the silicone rubber expands more at the portion where the sheet of the cylindrical material to be processed is wound, and the surface transfer member and the cylindrical A state in which the fluororesin layer is pressurized with the substrate is created. The heat from the infrared line heater softened the fluororesin (FEP) on the surface of the cylindrical base material, so that surface transfer and film formation were performed.
[0074]
Since the cylindrical material to be processed is rotating, surface transfer and film formation were similarly performed over the entire surface of the cylindrical material to be processed. In addition, since the fluororesin of the surface layer of the cylindrical base material is not melted in a softened state, and furthermore, the place where the processed cylindrical material / cylindrical material product is separated from the sheet is not directly heated, so The fluororesin of the surface layer of the base material did not adhere to the sheet as the surface transfer member, so that no trace of peeling was left.
[0075]
The surface roughness of the fired fluororesin film of the surface layer of the cylindrical material product 416 thus obtained is 0.5 μm in ten-point average roughness (Rz), and the surface pattern of the surface transfer member is a fluororesin. The film was transferred to the surface and a fluororesin film was formed. In addition, when the surface of the formed fluororesin layer was observed with an electron microscope, no defects such as cracks were observed on the surface. No deterioration was observed in the silicone rubber layer of the cylindrical substrate. Further, by fixing the holding jig at a position where the sheet is attached to the cylindrical member to be processed before heating in each cylindrical member to be processed, the cylindrical member to be processed regardless of the variation in the outer diameter of the cylindrical base material. Since the gap between the material and the surface transfer member can be made constant, defects due to variations in the outer diameter of the cylindrical base material are eliminated. In addition, the sheet shape makes cleaning easier.
[0076]
In this embodiment, the polyimide sheet is used as the surface transfer member. However, there is no particular limitation as long as the polyimide sheet can withstand the required temperature at the time of forming the fluororesin by firing and has a smaller thermal expansion than the cylindrical base material. A metal material such as iron, SUS, or aluminum, or a heat-resistant resin such as polyphenine sulfide may be used.
[0077]
(Example 5)
A fifth embodiment of the present invention will be described with reference to FIG.
[0078]
Reference numeral 51 denotes a cylindrical material to be processed having a fluororesin in the outermost layer, the outer diameter of which is 20 mm, and the length in the axial direction is 230 mm. The sectional view is shown in FIG. Reference numeral 511 denotes a metal core of the cylindrical substrate 510, which is made of aluminum and has a diameter of 18 mm. An LTV silicone rubber layer 513 is adhered to the core metal 511 via a primer layer 512 (the same material as the above-mentioned 112 and 312), and its thickness is about 1 mm. The silicone rubber layer was formed by inserting a cored metal coated with a primer into a cylindrical mold, injecting unvulcanized silicone rubber (the same as 113 and 313) of LTV, and curing it by heating. Reference numeral 514 denotes a primer layer for bonding the silicone rubber layer 513 and the surface fluororesin layer, and is composed of a mixture of fluoro rubber and fluoro resin (FEP). The primer layer 514 was obtained by applying an aqueous paint composed of a mixture of a fluororubber and a fluororesin by spraying and heating and curing at 200 ° C. for 30 minutes, and its thickness was 25 μm. On the primer layer 514, a fluororesin (FEP) layer 515 is formed. The fluororesin layer 515 is formed by spraying a fluororesin (FEP) dispersion (same as 115 and 315) by spraying, drying at 150 ° C for 20 minutes, and preheating and firing at 300 ° C for 20 minutes. The thickness at that time was 15 μm. At that time, the fluororesin layer was not completely formed, and defects such as cracks and irregularities were observed on the surface. At that time, the surface roughness of the fluororesin surface was 15 μm in terms of ten-point average roughness (Rz).
[0079]
Reference numeral 52 denotes a surface transfer member according to the present invention, which is a sheet-like member having a surface pattern to be transferred to a fluororesin film temporarily formed on the cylindrical base material on the side of the cylindrical material to be processed, which is U-shaped. It is bent into a letter. In this example, a polyimide sheet (same as 42) having a width of 250 mm, a length of 600 mm, and a thickness of 0.05 mm and having a smaller thermal expansion than the silicone rubber of the cylindrical base material was used. The surface of the cylindrical material contacting side was processed to have a surface roughness of 0.5 μm as a ten-point average roughness (Rz).
[0080]
The both ends of the surface transfer member 52 are fixed to a sheet holding jig 53 such that the other end relatively moves by the movement of one end. In the present embodiment, a rack and pinion mechanism in which a motor for reciprocating the rack is connected to a pinion gear as shown in FIG. First, the cylindrical member 51 to be processed is passed between the surface transfer member 52 and the sheet holding jig 53 and connected to a rotatable rotary table 54 for holding and rotating both ends of the core of the cylindrical member 51 to be processed (FIG. 5). .B). In this embodiment, in this state, the polyimide sheet 52 as the surface transfer member is wound about 4/5 around the cylindrical member 51 to be processed by using two winding rollers 56 having an outer diameter of 16 mm. The winding roller is rotatable but its position is fixed. In this state, the sheet holding jig 53 is moved, and the position of the sheet holding jig 53 is fixed in a state where the sheet sticks to the cylindrical member to be processed.
[0081]
After setting the apparatus as described above, the cylindrical material to be processed was heated from above (from outside) the polyimide sheet. In this embodiment, an infrared line heater 55 (line condensing type; focal length f = 50 mm) of 280 mm and 3 kW output slightly longer than the surface transfer sheet is disposed at a distance of about 40 mm from the surface of the sheet as a surface transfer member. While moving the sheet at a speed of about 21 mm / sec by a motor connected to the sheet holding jig 53, the sheet was heated by the infrared line heater until the sheet surface reached 270 ° C. (3 kW). The cylindrical member 51 to be processed was accordingly driven to rotate at a speed of about 20 rpm. The motor is reversed before the edge of the sheet reaches the limit of the sheet holding jig. When the surface transfer was performed while repeating this operation about every 20 seconds, the surface transfer and the film formation were possible in 90 seconds. This can be said that the polyimide sheet and the fluororesin, which are surface transfer members, do not absorb much infrared rays and thus have little thermal expansion, and furthermore, the fusion interface is selectively heated, so that the speed is faster.
[0082]
Thereafter, the cylindrical product 516 was cooled, the sheet holding jig 53 was moved, and the sheet was loosened to remove the cylindrical product 516 from the turntable 54. When heated, the thermal expansion of the silicone rubber is larger than the polyimide sheet, which is a surface transfer member, so that the silicone rubber expands more at the portion where the sheet of the cylindrical material to be processed is wound, and the surface transfer member and the cylindrical A state in which the fluororesin layer is pressurized with the substrate is created. The heat from the infrared line heater softened the fluororesin (FEP) on the surface of the cylindrical base material, so that surface transfer and film formation were performed.
[0083]
Since the cylindrical material to be processed is rotating, surface transfer and film formation were similarly performed over the entire surface of the cylindrical material to be processed. In addition, since the fluororesin of the surface layer of the cylindrical base material is not melted in a softened state, and furthermore, the place where the processed cylindrical material / cylindrical material product is separated from the sheet is not directly heated, so The fluororesin of the surface layer of the base material did not adhere to the sheet as the surface transfer member, so that no trace of peeling was left.
[0084]
The surface roughness of the baked fluororesin film 517 on the surface layer of the cylindrical material product 516 thus obtained is 0.5 μm in ten-point average roughness (Rz), and the surface pattern of the surface transfer member is fluorine. The film was transferred to the resin surface and a fluororesin film was formed. In addition, when the surface of the formed fluororesin layer was observed with an electron microscope, no defects such as cracks were observed on the surface. No deterioration was observed in the silicone rubber layer of the cylindrical substrate. Further, by fixing the holding jig at a position where the sheet is attached to the cylindrical member to be processed before heating in each cylindrical member to be processed, the cylindrical member to be processed regardless of the variation in the outer diameter of the cylindrical base material. Since the gap between the material and the surface transfer member can be made constant, defects due to variations in the outer diameter of the cylindrical base material are eliminated. In addition, the sheet shape makes cleaning easier.
[0085]
In this embodiment, the polyimide sheet is used as the surface transfer member. However, there is no particular limitation as long as the polyimide sheet can withstand the required temperature at the time of forming the fluororesin by firing and has a smaller thermal expansion than the cylindrical base material. A metal material such as iron, SUS, or aluminum, or a heat-resistant resin such as polyphenine sulfide may be used.
[0086]
Further, when the silicone rubber layer of the cylindrical base material is extremely thin as 1 mm as in this example, the processing conditions and the evaluation results when cylindrical surface transfer is used are shown in Table 2 below.
As a result, since the thickness of the silicone rubber layer is thin as in the present embodiment, when the gap between the cylindrical substrate and the surface transfer member must be extremely narrow, The fact that the insertion of the cylindrical material to be processed becomes difficult or that the cylindrical material product becomes difficult to be removed after processing means that in the present method of winding a sheet, the cylindrical material to be processed is set before heating and the sheet is wound. This is irrelevant because the sheet may be peeled off after processing. Further, by fixing the sheet holding jig before the heating in a state where the sheet is attached to the cylindrical member to be processed, the gap between the cylindrical member to be processed and the surface transfer member can be extremely narrowed. Can be adequately applied to the case where the thickness is small, and the surface transfer and the film formation can be performed without deterioration of the silicone rubber layer.
[0087]
[Table 2]

(Example 6)
A sixth embodiment of the present invention will be described with reference to FIG.
[0088]
Reference numeral 61 denotes a cylindrical material to be processed having a fluororesin in the outermost layer, which is the same as the cylindrical material to be processed 11 of Example 1, and the fluororesin layer is not completely formed, and the surface has cracks and irregularities. Failure was seen. At that time, the surface composition of the fluororesin surface was 15 μm in terms of ten-point average roughness (Rz).
[0089]
Reference numeral 62 denotes a surface transfer member according to the present invention, which is a sheet-like member having a surface pattern to be transferred to a fluororesin film temporarily formed on the cylindrical base material on the side of the cylindrical material to be processed, which is U. It is bent into a letter. In this example, a polyimide sheet (same as 42 and 52) having a width of 250 mm, a length of 600 mm, and a thickness of 0.05 mm and having a smaller thermal expansion than the silicone rubber of the cylindrical base material was used. The surface of the cylindrical material contacting side was processed to have a surface roughness of 0.5 μm as a ten-point average roughness (Rz).
[0090]
In this embodiment, a supply roll 67 in which the polyimide sheet is wound on a core is used. First, the sheet is pulled out from the supply roll 67, passes under two winding rollers 66 having an outer diameter of 16 mm, and is fixed to the sheet winding roll 68. In this state, the sheet is drawn out from between the two winding rolls, and a cylindrical member 61 to be processed is passed between the sheets. Connect (Fig. 6.B). The sheet is taken up by the supply roll 67 or the sheet take-up roll 68 so that the sheet does not slack. At this point, the polyimide sheet 62, which is a surface transfer member, is wound about 4/5 around the cylindrical material 61 to be processed. The winding roller is rotatable but its position is fixed.
[0091]
The supply roll 67 and the sheet take-up roll 68 are provided with a motor, and after setting the apparatus as described above, the length of the polyimide sheet between the supply roll 67 and the sheet take-up roll 68 before heating is adjusted. The cylindrical material to be processed was heated from above (from outside) the polyimide sheet while moving and winding the sheet at a speed of about 21 mm / sec so as not to change. In the present embodiment, an infrared line heater 65 (line focusing type; focal length f = 50 mm) of 280 mm and 3 kW output slightly longer than the surface transfer sheet is arranged at a distance of about 40 mm from the sheet surface as a surface transfer member. The surface was heated by an infrared line heater until the surface reached 270 ° C. (3 kW). The cylindrical material 61 to be processed was driven and rotated at a speed of about 20 rpm. The sheet was flowed in one direction from a supply roll 67 to a take-up roll 68. When the surface transfer was performed in this manner, the surface transfer and the film formation were possible in 60 seconds. This can be said that the polyimide sheet and the fluororesin, which are surface transfer members, do not absorb much infrared rays and thus have little thermal expansion, and furthermore, the fusion interface is selectively heated, so that the speed is faster.
[0092]
Thereafter, the cylindrical product 616 was cooled and the sheet was loosened to remove the cylindrical product 616 from the turntable 64. When heated, the thermal expansion of the silicone rubber is larger than that of the polyimide sheet as the surface transfer member, so that the silicone rubber further expands at the portion where the sheet of the cylindrical material to be processed is wrapped, and the surface transfer member and the cylindrical base member are expanded. A state in which the fluororesin layer is pressurized with a material is created. The heat from the infrared line heater softened the fluororesin (FEP) on the surface of the cylindrical base material, so that surface transfer and film formation were performed.
[0093]
Since the cylindrical material to be processed is rotating, surface transfer and film formation were similarly performed over the entire surface of the cylindrical material to be processed. In addition, since the fluororesin of the surface layer of the cylindrical base material is not melted in a softened state, and furthermore, the place where the processed cylindrical material / cylindrical material product is separated from the sheet is not directly heated, so The fluororesin of the surface layer of the base material did not adhere to the sheet as the surface transfer member, so that no trace of peeling was left.
[0094]
The surface roughness of the calcined film of the fluororesin on the surface layer of the cylindrical material product 616 thus obtained is 0.5 μm in ten-point average roughness (Rz), and the surface pattern of the surface transfer member is a fluororesin. The film was transferred to the surface and a fluororesin film was formed. In addition, when the surface of the formed fluororesin layer was observed with an electron microscope, no defects such as cracks were observed on the surface. No deterioration was observed in the silicone rubber layer of the cylindrical substrate. In addition, by moving the polyimide sheet between the supply roll 67 and the sheet take-up roll 68 before heating so that the length of the polyimide sheet is not changed, the outer diameter of the cylindrical substrate varies. Irrespective of the above, the gap between the cylindrical member to be processed and the surface transfer member can be made constant, so that the defect due to the variation in the outer diameter of the cylindrical base material is eliminated. Further, when the sheet is no longer present in the sheet supply roll 67, the sheet can be rewound from the sheet take-up roll 68 and reused. In addition, since the sheet can be cleaned on-line from the sheet supply roll 67 to the winding roll 66, the transfer of the surface on a new and clean surface and film formation can be performed at all times.
[0095]
In this embodiment, the polyimide sheet is used as the surface transfer member. However, there is no particular limitation as long as the polyimide sheet can withstand the required temperature at the time of forming the fluororesin by firing and has a smaller thermal expansion than the cylindrical base material. A metal material such as iron, SUS, or aluminum, or a heat-resistant resin such as polyphenine sulfide may be used.
[0096]
(Example 7)
A seventh embodiment of the present invention will be described with reference to FIG.
[0097]
Reference numeral 71 denotes a cylindrical material to be processed having a fluororesin in the outermost layer, which is the same as the cylindrical material to be processed 11 of Example 1, in which the fluororesin layer is not completely formed, and cracks and irregularities are formed on the surface. Failure was seen. At that time, the surface composition of the fluororesin surface was 15 μm in terms of ten-point average roughness (Rz).
[0098]
Reference numeral 72 denotes a surface transfer member according to the present invention, which is a sheet-shaped member having a surface pattern to be transferred to a fluororesin film temporarily formed on the cylindrical substrate on the side of the cylindrical material to be processed abutting on both sides. The connected belt-shaped thing is used. In this embodiment, a polyimide sheet (same as 42, 52, and 62) having a width of 250 mm, a length of 600 mm, and a thickness of 0.05 mm and having a smaller thermal expansion than the silicone rubber of the cylindrical base material was used. The surface of the cylindrical material contacting side was processed to have a surface roughness of 0.5 μm as a ten-point average roughness (Rz).
[0099]
The polyimide belt serving as the surface transfer member 72 includes a motor for moving the belt inside thereof, and includes a cylindrical sheet stretching member 73 provided in parallel with the cylindrical member 71 to be processed. The belt on the side of the cylindrical member 71 to be processed is extended between two winding rollers 76 having an outer diameter of 16 mm. The cylindrical member 71 to be processed is passed between the belts and connected to a rotatable rotary table 74 for holding and rotating both ends of the metal core of the cylindrical member 71 to be processed (FIG. 7B). The winding roller is rotatable but its position is fixed. In this state, the sheet stretching member 73 is moved to fix the position of the sheet stretching member 73 in a state in which the sheet sticks to the cylindrical material to be processed. At this point, a polyimide sheet 72 as a surface transfer member is wound about 4/5 around the cylindrical member 71 to be processed.
[0100]
After setting the apparatus as described above, the cylindrical material to be processed was heated from above (from the outside) the polyimide sheet. In this embodiment, an infrared line heater 75 (line condensing type; focal length f = 50 mm) of 280 mm and 3 kW output slightly longer than the surface transfer sheet is disposed at a distance of about 40 mm from the surface of the sheet as the surface transfer member. While moving the sheet at a speed of about 21 mm / sec by a motor connected to the sheet stretching member 73, the sheet was heated by the infrared line heater until the sheet surface reached 270 ° C (3 kW). The cylindrical material to be processed 71 was driven to rotate at a speed of about 20 rpm. The motor was inverted before the belt joint wrapped around the wrap roller 76. When the surface transfer was performed while repeating this operation about every 20 seconds, the surface transfer and the film formation were possible in 60 seconds. This can be said that the polyimide sheet and the fluororesin, which are surface transfer members, do not absorb much infrared rays and thus have little thermal expansion, and moreover, the fusion interface is selectively heated, so that the speed is faster.
[0101]
Thereafter, the cylindrical product 716 was cooled and the sheet was loosened to remove the cylindrical product 716 from the turntable 74. When heated, the thermal expansion of the silicone rubber is larger than that of the polyimide sheet as the surface transfer member, so that the silicone rubber further expands at the portion where the sheet of the cylindrical material to be processed is wrapped, and the surface transfer member and the cylindrical base member are expanded. A state in which the fluororesin layer is pressurized with a material is created. The heat from the infrared line heater softened the fluororesin (FEP) on the surface of the cylindrical base material, so that surface transfer and film formation were performed.
[0102]
Since the cylindrical material to be processed is rotating, surface transfer and film formation were similarly performed over the entire surface of the cylindrical material to be processed. In addition, since the fluororesin of the surface layer of the cylindrical base material is not melted in a softened state, and furthermore, the place where the processed cylindrical material / cylindrical material product is separated from the sheet is not directly heated, so The fluororesin of the surface layer of the base material did not adhere to the sheet as the surface transfer member, so that no trace of peeling was left.
[0103]
The surface roughness of the calcined film of the fluororesin of the surface layer of the cylindrical material product 716 thus obtained is 0.5 μm in ten-point average roughness (Rz), and the surface pattern of the surface transfer member is a fluororesin. The film was transferred to the surface and a fluororesin film was formed. In addition, when the surface of the formed fluororesin layer was observed with an electron microscope, no defects such as cracks were observed on the surface. No deterioration was observed in the silicone rubber layer of the cylindrical substrate. In addition, by fixing the sheet stretching member 73 to a position where the sheet is tightly attached to the cylindrical member to be processed before heating in each cylindrical member to be processed, the sheet extending member 73 and the cylindrical member to be processed regardless of the variation in the outer diameter of the cylindrical base material. Since the gap with the surface transfer member can be kept constant, defects due to variations in the outer diameter of the cylindrical substrate are eliminated. Furthermore, cleaning is easy and the device configuration is also simple.
[0104]
In this embodiment, the polyimide sheet is used as the surface transfer member. However, there is no particular limitation as long as the polyimide sheet can withstand the required temperature at the time of forming the fluororesin by firing and has a smaller thermal expansion than the cylindrical base material. A metal material such as iron, SUS, or aluminum, or a heat-resistant resin such as polyphenine sulfide may be used.
[0105]
(Reference Example 1)
In Reference Example 1, surface transfer and film formation were performed under the same conditions by the method of Example 2 using the same cylindrical material to be processed as in Example 3.
[0106]
(Comparative Example 1)
Comparative Example 1 uses the same cylindrical material to be processed as in Example 4, and uses a polyimide cylindrical surface transfer member having an inner diameter of φ20.4, a thickness of 0.05 mm, and a length of 280 mm as the surface transfer member. Disposing a cylindrical material to be processed in the cylindrical surface transfer member, and rotating the cylindrical material to be processed at 20 rpm from the outside of the surface transfer member by the infrared line heater under the same heating conditions as in Example 4. The surface transfer and film formation were performed by heating. At this time, the required processing time was 90 seconds.
[0107]
(Comparative Example 2)
Comparative Example 2 used the same cylindrical material to be processed as in Example 5, and used a polyimide cylindrical surface transfer member having an inner diameter of φ20.4, a thickness of 0.05 mm, and a length of 280 mm as the surface transfer member. Disposing a cylindrical member to be processed in the cylindrical surface transfer member, and rotating the cylindrical member at 20 rpm from outside of the surface transfer member by the infrared line heater under the same heating conditions as in Example 5. The surface transfer and film formation were performed by heating. At this time, the temperature of the surface was not enough at 270 ° C. and needed to be raised to 300 ° C.
[0108]
In addition, the processing time also required 180 seconds, which resulted in some deterioration of the rubber.
[0109]
【The invention's effect】
As described above, the state in which the fluororesin layer is pressed using the difference in the coefficient of thermal expansion between the cylindrical base material and the surface transfer member without using the cylindrical surface transfer member by using such a method. Can be heated. For this reason, the gap between the cylindrical member to be processed and the surface transfer member varies due to the variation in the outer diameter of the cylindrical base material, which is important for the cylindrical surface transfer member, which makes stable surface transfer and film formation difficult. The problem is that by fixing the holding jig at the position where the sheet does not sag before heating the cylindrical material, the gap between the cylindrical material to be processed and the surface transfer member regardless of the variation in the outer diameter of the cylindrical substrate Was resolved because it was possible to keep
[0110]
In addition, when the gap between the cylindrical material to be processed and the surface transfer member must be extremely narrow because the thermal expansion of the cylindrical base material is small or the thickness is small, the cylindrical material to be processed is transferred to the cylindrical surface transfer member. The fact that insertion becomes difficult or that the cylindrical product becomes difficult to remove after processing means that in this method of winding a sheet, the cylindrical material to be processed is set before heating, the sheet is wound, and the sheet is processed after processing. It is irrelevant because you only have to peel it off. Further, by fixing the sheet holding jig before the heating in a state where the sheet is attached to the cylindrical member to be processed, the gap between the cylindrical member to be processed and the surface transfer member can be extremely narrowed. It was able to sufficiently cope with small expansion and thin thickness.
[0111]
Further, by making the surface transfer member into a sheet shape, it is very easy to clean the surface of the portion where the surface is transferred to the cylindrical material to be processed.
[Brief description of the drawings]
FIG. 1 is a fluororesin of Example 1. Transfer the surface pattern of the transfer member to the surface Schematic diagram of the method
A Cross-sectional view of cylindrical material to be processed and cylindrical material product of Example 1
B. Diagram of how to attach the cylindrical material to be processed in the first embodiment
FIG. 2 is a fluororesin of Example 2. Transfer the surface pattern of the transfer member to the surface Schematic diagram of the method
FIG. 3 is a fluororesin of Example 3. Transfer the surface pattern of the transfer member to the surface Schematic diagram of the method
A Cross-sectional view of cylindrical material to be processed and cylindrical material product of Example 3
B Mounting method of the cylindrical material to be processed according to the third embodiment
FIG. 4 is a fluororesin of Example 4. Transfer the surface pattern of the transfer member to the surface Schematic diagram of the method
B Mounting method of the cylindrical material to be processed according to the fourth embodiment
FIG. 5 is a fluororesin of Example 5. Transfer the surface pattern of the transfer member to the surface Schematic diagram of the method
A Cross-sectional view of cylindrical material to be processed and cylindrical material product of Example 5
B Mounting method of the cylindrical material to be processed in the fifth embodiment
FIG. 6 is a fluororesin of Example 6. Transfer the surface pattern of the transfer member to the surface Schematic diagram of method (core cooling)
B Method of attaching cylindrical material to be processed in embodiment 6
FIG. 7 is a fluororesin of Example 7. Transfer the surface pattern of the transfer member to the surface Schematic diagram of the method
B Mounting method of the cylindrical material to be processed according to the seventh embodiment
[Explanation of symbols]
11: cylindrical material to be processed
110: Cylindrical substrate
111: Core
112: Primer
113: Silicone rubber layer
114: Fluoro rubber / Fluoro resin layer
115: Fluororesin layer (preformed)
116: Cylindrical material products
117: Fluororesin layer (after film formation)
12: Surface transfer member
13: Sheet holding jig
14: Turntable
15: Heat roll
21: cylindrical material to be processed
216: Cylindrical material products
22: Surface transfer member
23: Sheet holding jig
24: Turntable
25: Heat roll
31: Cylinder material to be processed
310: cylindrical substrate
311: Core metal
312: Primer
313: Silicone rubber layer
314: Fluoro rubber / fluoro resin layer
315: Fluororesin layer (preliminary formation)
316: Cylindrical material products
317: Fluororesin layer (after film formation)
32: Surface transfer member
33: Sheet holding jig
34: Turntable
35: Heat roll
36: Winding roller
41: Cylinder to be processed
416: Cylindrical material products
42: Surface transfer member
43: Sheet holding jig
44: Turntable
45: Infrared line heater
46: Winding roller
51: Cylinder material to be processed
510: Cylindrical substrate
511: core metal
512: Primer
513: Silicone rubber layer
514: Fluoro rubber / fluoro resin layer
515: Fluororesin layer (preliminary formation)
516: Cylindrical material products
517: Fluororesin layer (after film formation)
52: Surface transfer member
53: Sheet holding jig
54: Turntable
55: Infrared line heater
56: Winding roller
61: Cylinder to be processed
62: Image transfer member
64: turntable
65: Infrared line heater
66: Winding roller
67: Supply roll
68: Winding roll
71: Cylinder material to be processed
72: Surface transfer member
73: Sheet stretching member
74: Turntable
75: Infrared line heater
76: Winding roller

Claims (7)

For a processed cylindrical material in which a fluororesin layer capable of surface processing is preformed on a cylindrical substrate, a fluororesin layer on the cylindrical substrate, and a surface transfer member disposed outside the fluororesin layer. By heating the fluororesin layer in a pressurized state using the difference in the coefficient of thermal expansion between the cylindrical base material and the surface transfer member, the surface pattern of the surface transfer member is changed to the fluororesin layer. In the method of transferring the surface pattern of the transfer member to the surface of the fluororesin to be transferred to the surface , using a sheet-shaped material having a smaller coefficient of thermal expansion than the cylindrical base material as the surface transfer member, A sheet holding jig in which both ends of the sheet are relatively moved by an amount corresponding to the movement of one end in a state where the sheet is wound at least 1/3 of the circumference of the cylindrical material to be processed. With the sheet stretched forward. The position of the holding jig is fixed, and the workpiece is heated from the outside of the sheet while the sheet is driven while rotating while the axis of the workpiece is rotatably fixed. A method of transferring a surface pattern of a transfer member to a surface of a fluororesin. Rather than directly rotating the processed cylindrical material, the processed cylindrical material is heated from the outside of the sheet while the processed cylindrical material is driven by moving the sheet wound around the processed cylindrical material. The method according to claim 1, wherein the surface pattern of the transfer member is transferred to the surface of the fluororesin. Using at least one or more winding rollers for winding the sheet around the cylindrical member to be processed, and forming the sheet to be used as the surface transfer member on the cylindrical member to be processed by the winding roller, The method for transferring a surface pattern of a transfer member to a fluororesin surface according to claim 2, wherein the cylindrical material to be processed is heated from outside of the sheet while holding and rotating the cylindrical material. Characterized by using an infrared heater as heating means, a method of transferring a surface texture of the transfer member with fluorine resin surface according to claim 2 or 3. The method for transferring a surface pattern of a transfer member to a fluororesin surface according to any one of claims 1 to 4, wherein the sheet used as the surface transfer member is a polyimide sheet. The surface pattern of the transfer member is provided on the fluororesin surface according to any one of claims 1 to 5, wherein the sheet is supplied from a roll and wound up by another roll. How to transfer . The sheet has a belt shape partially connected thereto, and is rotatable in a cylindrical shape provided in parallel with the processed cylindrical material in a state of being wound in a circumferential direction of the processed cylindrical material before heating. The surface of the transfer member on the fluororesin surface according to any one of claims 1 to 5, wherein the sheet is held in a state where the sheet is stretched to such an extent that tension is applied or not applied to the sheet stretching member. How to transfer patterns .

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