JP2011232758A - 画像形成装置 - Google Patents
画像形成装置 Download PDFInfo
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- JP2011232758A JP2011232758A JP2011099249A JP2011099249A JP2011232758A JP 2011232758 A JP2011232758 A JP 2011232758A JP 2011099249 A JP2011099249 A JP 2011099249A JP 2011099249 A JP2011099249 A JP 2011099249A JP 2011232758 A JP2011232758 A JP 2011232758A
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Abstract
【解決手段】バインダー樹脂と、呈色性化合物および顕色剤を含有し、外殻により覆われたカプセル構造を有している着色剤とを備える消色可能であるトナーを用いて記録媒体に形成されたトナー像を加熱する加熱部材と、前記加熱部材に圧接してニップ部を形成し、前記加熱部材と協働して記録媒体を挟持搬送する加圧部材と、前記トナーの濃度維持限界温度以下の温度であって、且つトナーの溶融限界温度以上の温度に前記加熱部材の温度を制御する温度制御部400と、記録媒体が前記ニップ部を通過するのに要する時間が100msec以上となるように記録媒体の前記ニップ部における搬送速度を制御する搬送制御部420と、を備える画像形成装置。
【選択図】図4
Description
まず、本実施形態における画像形成装置の一例であるMFP(Multi Function Peripheral)の構成について、図1を用いて説明する。図1は、画像形成装置の概要を示す外観図である。
次に、本実施形態の画像形成装置300に係るカプセル式消色トナーについて説明する。
本実施形態に係るカプセル式消色トナーは、バインダー樹脂と、着色剤(色材ともいう)とを有する。なお、本明細書において、着色剤とは、トナーに色を付与する1種の化合物、または組成物をいう。
具体的には、電子供与性の呈色性化合物と電子受容性の顕色剤とから構成することができる。電子供与性の呈色性化合物は、具体的にはロイコ色素とすることができる。ロイコ色素単独では無色であるが、ロイコ色素と顕色剤が結合することにより発色する。
例えば、ロイコ色素としては、ジフェ二ルメタンフタリド類、フェニルインドリルフタリド類、インドリルフタリド類、ジフェニルメタンアザフタリド類、フェニルインドリルアザフタリド類、フルオラン類、スチリノキノリン類、ジアザローダミンラクトン類等が挙げられる。
カルボン酸成分の中では上記の中で不飽和多価カルボン酸成分及びこれらの無水物を持つものが特に好ましい。
離型剤の軟化点は低温定着性の観点から、60℃〜120℃、より望ましくは70℃〜110℃である。
界面活性剤としては、例えば、硫酸エステル塩系、スルホン酸塩系、リン酸エステル系、せっけん系等のアニオン性界面活性剤、アミン塩型、4級アンモニウム塩型等のカチオン性界面活性剤、ポリエチレングリコール系、アルキルフェノールエチレンオキサイド付加物系、及び多価アルコール系等の非イオン性界面活性剤が挙げられる。
例えば、カプセル化された着色剤と、バインダー樹脂の粒子とを凝集および融着させることにより製造することができる。
離型剤の分散液についても、バインダー樹脂を含む粒子の分散液の場合と同様の方法で得ることができる。
次に、本実施形態の画像形成装置300の定着処理に係る機能ブロックについて説明する。図4に示すように、本実施形態の画像形成装置300は、温度制御部400と搬送制御部420とを有する。各機能ブロックは、例えば、メモリ354に読み出されたプログラムをCPU345が実行することにより実現することができる。
ニップ幅の値は、定着ローラの表面温度が約180℃の状態で、厚み100μmのPETシートをニップに挟み、30秒間放置したのちPETシートを取り出し、白濁した部分の幅を測定することにより得ることができる。
本実施形態における画像形成処理のうちの定着処理の処理フローの一例を図6に示す。
搬送制御部420が用紙Pがニップ部Nを通過するのに要する時間が100msec以上となるように用紙Pのニップ部Nにおける搬送速度を制御する理由について説明する。
呈色性化合物と顕色剤とがカプセル化されたカプセル式消色トナーは、消色処理を迅速に行うことができる。一方、従来の定着制御温度(例えば180℃)で定着処理を行ったときにその温度が画像の濃度が維持される限界の温度よりも高い温度であると、着色剤の消色が起こり、その結果当該トナーを用いた画像の画像濃度が低下して、画像が用紙Pに形成されない場合があった。
また、各実験で形成されたベタ画像の画像濃度については、反射濃度計マクベスRD19Iを用いて測定した。
実験例1においては、図3に示す定着装置を備える画像形成装置を用いた。転写部302および定着装置26の構成および画像形成処理についての説明は重複するため、省略する。
バインダー樹脂を含む微粒化液の調製:バインダー樹脂として、ガラス転移温度Tgが50℃、軟化点が100℃であるPes(Polyester)系樹脂を用いた。このPes系樹脂30質量部と、アニオン性乳化剤(花王製ネオペレックスG15)3質量部、中和剤(ジメチルアミノエタノール)0.6質量部を用いて高圧ホモジナイザーを使用してバインダー樹脂を含む粒子の分散液(微粒化液)を作成した。
実験例2においては、実験例1とは異なる構造の定着装置26を備える画像形成装置を用いた。なお、実験例1と共通する構成および処理については説明を省略する。
実験例3においては、実験例1および2とは異なる構造の定着装置26を備える画像形成装置を用いた。なお、実験例1および2と共通する構成および処理については説明を省略する。
図12から理解できるように、溶融限界温度はニップ幅と用紙搬送速度に依存、つまりニップ通過時間に依存して変化することが分かる。そして、ニップ通過時間100msec以上で、カプセル式消色トナーの発色を維持しつつ、定着もできるようになることが分かる。ここで、ニップ通過時間を200msec以上とすると、濃度維持限界温度と溶融限界温度との差をより大きくできるので、より確実に良好な画像を得ることができるので好ましい(詳しくは後述)。一方、100msec未満の場合は、定着と画像濃度の維持とを両立できない。
次に、本実施形態に係るトナーにおける着色剤の含有割合について説明する。本実施形態に係るカプセル式消色トナーにおいて、そのトナーにおける着色剤の含有量は、10質量%以上30質量%以下であることが好ましい。上述の実験例1〜3は、着色剤の含有量を10質量%として行った。実験例1における画像濃度(ニップ通過時間:300msec)は、0.3であった。また、着色剤の含有量を30質量%と変更した以外は、実験例1と同じ条件で画像を形成した。その際、画像濃度は0.5であった。
本実施形態において、上述のとおり、温度制御部400は、着色剤の濃度維持限界温度以下の温度であって、且つトナーの溶融限界温度以上の温度に加熱部材の温度(定着制御温度)を制御する。
一方、定着制御温度が75℃ではトナーが十分に溶融せず、定着不良が発生してしまった。
従って、消色トナーの場合には定着制御温度を100℃以下に制御することが好ましい。より好ましくは90℃以下である。このとき、発色性が維持されるとともに、低温オフセットが生じないようにするため、定着ベルトや定着ローラの温度が変化しても、その変化を許容できる速度に搬送速度が設定されることが好ましい。すなわち、濃度維持限界温度と溶融限界温度との間に当該変化を許容できる温度差が存在する速度に搬送速度が設定されることが好ましい。
以上に詳述したように、この明細書に記載の技術によれば、定着処理において画像の消去を防止しながらトナー像を記録媒体に定着できる。
Claims (7)
- バインダー樹脂と、呈色性化合物および顕色剤を含有し、外殻により覆われたカプセル構造を有している着色剤とを備える消色可能であるトナーを用いて記録媒体に形成されたトナー像を加熱する加熱部材と、
前記加熱部材に圧接してニップ部を形成し、前記加熱部材と協働して記録媒体を挟持搬送する加圧部材と、
前記トナーの濃度維持限界温度以下の温度であって、且つトナーの溶融限界温度以上の温度に前記加熱部材の温度を制御する温度制御部と、
記録媒体が前記ニップ部を通過するのに要する時間が100msec以上となるように記録媒体の前記ニップ部における搬送速度を制御する搬送制御部と、を備える画像形成装置。 - 請求項1に記載の装置において、
記録媒体の搬送方向とは直行する方向における前記ニップ部の中央近傍の前記搬送方向における長さが4.5mm以上14.5mm以下である画像形成装置。 - 請求項1に記載の装置において、
前記消色可能であるトナーは、前記着色剤を10質量%以上30質量%以下の割合で含有する画像形成装置。 - 請求項1に記載の装置において、
前記搬送制御部は、記録媒体が前記ニップ部を通過するのに要する時間が200msec以上となるように記録媒体の前記ニップ部における搬送速度を制御する画像形成装置。 - 請求項4に記載の装置において、
前記搬送制御部は、記録媒体が前記ニップ部を通過するのに要する時間が200msec以上300msec以下となるように記録媒体の前記ニップ部における搬送速度を制御する画像形成装置。 - 請求項1に記載の装置において、
前記温度制御部は、前記加熱部材の温度を100℃以下に制御する画像形成装置。 - 請求項1に記載の装置において、
前記温度制御部は、前記加熱部材の温度を90℃以下に制御する画像形成装置。
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Application Number | Priority Date | Filing Date | Title |
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US32838210P | 2010-04-27 | 2010-04-27 | |
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US13/094,177 US8805224B2 (en) | 2010-04-27 | 2011-04-26 | Image forming apparatus |
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JP2013109314A (ja) * | 2011-11-21 | 2013-06-06 | Toshiba Corp | 画像形成装置、画像形成方法 |
JP2014077861A (ja) * | 2012-10-10 | 2014-05-01 | Toshiba Corp | 画像形成装置 |
JP2014109747A (ja) * | 2012-12-04 | 2014-06-12 | Toshiba Corp | 電子写真装置 |
JP2014119600A (ja) * | 2012-12-17 | 2014-06-30 | Toshiba Corp | 定着方法 |
JP2014137494A (ja) * | 2013-01-17 | 2014-07-28 | Toshiba Tec Corp | 消去可能なトナー |
KR20140102866A (ko) * | 2013-02-15 | 2014-08-25 | 삼성전자주식회사 | 정착장치와 이를 가지는 화상형성장치 |
JP2016109935A (ja) * | 2014-12-08 | 2016-06-20 | 株式会社東芝 | 画像形成装置 |
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Also Published As
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EP2383618A2 (en) | 2011-11-02 |
JP2014098928A (ja) | 2014-05-29 |
US8805224B2 (en) | 2014-08-12 |
KR101240062B1 (ko) | 2013-03-06 |
JP5813146B2 (ja) | 2015-11-17 |
US20110262166A1 (en) | 2011-10-27 |
CN102236283A (zh) | 2011-11-09 |
CN106154792A (zh) | 2016-11-23 |
JP5469633B2 (ja) | 2014-04-16 |
KR20110119552A (ko) | 2011-11-02 |
US20140321872A1 (en) | 2014-10-30 |
US9104153B2 (en) | 2015-08-11 |
CN106154792B (zh) | 2020-03-03 |
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