JP2012155207A - トナー供給ローラおよびそれを用いた画像形成装置 - Google Patents
トナー供給ローラおよびそれを用いた画像形成装置 Download PDFInfo
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- JP2012155207A JP2012155207A JP2011015514A JP2011015514A JP2012155207A JP 2012155207 A JP2012155207 A JP 2012155207A JP 2011015514 A JP2011015514 A JP 2011015514A JP 2011015514 A JP2011015514 A JP 2011015514A JP 2012155207 A JP2012155207 A JP 2012155207A
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- Prior art keywords
- toner supply
- supply roller
- toner
- image forming
- resin
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Abstract
【解決手段】非磁性トナーを用いたジャンピング現像方式に用いられるトナー供給ローラである。22.5℃55%RHでの、100Vの電圧印加時における電気抵抗値が6.0〜8.2(logΩ)である。非磁性トナーを用いたジャンピング現像方式の画像形成装置である。上記トナー供給ローラと、表面粗さ(Sm)が200〜300μmである現像ローラと、を備える。
【選択図】図1
Description
すなわち、上記非磁性ジャンピング現像方式では、現像部における現像効率が高く、現像後の現像ローラ上に残存する現像されるべきトナーの量は少ないことから、問題となるのは、現像後の現像ローラ上に残存する現像されなくて当然の不要トナーであると考えられる。上述のように、現像後の現像ローラ上の未現像トナーはトナー供給ローラにより物理的に掻き取られるが、それには限界がある。したがって、上記のようなネガゴーストの問題は、現像後の現像ローラ上に残存する不要トナーが、次の現像サイクルにおいて濃度低下の不具合を引き起こすものであると考えられる。
本発明のトナー供給ローラは、非磁性トナーを用いたジャンピング現像方式に用いられるものであって、常温常湿環境下、具体的には22.5℃55%RHでの、100Vの電圧印加時における電気抵抗値が6.0〜8.2(logΩ)、好適には7.5〜7.9(logΩ)である点に特徴を有する。かかる電気抵抗値を有するトナー供給ローラを用いることで、少なくともベタ部分について、白抜き部分の次に印刷される色付き部分において、他の色付き部分よりも画像濃度が薄くなるネガゴーストの現象を改善することができ、画像不具合の発生を防止することができる。
<トナー供給ローラの作製>
まず、ウレタンフォームA(株式会社ブリヂストン製,除膜処理あり)を準備した。このウレタンフォームAは、密度29kg/m3、通気量196cm3/cm2/sec、硬度10kgf、平均セル径280μmを有していた。また、バインダー(エネックス社製「SEバインダー」,ウレタン樹脂水分散体)100質量部と、固形分50%のシリコーン粉体(東レ・ダウコーニング(株)製)2質量部と、導電剤(ライオン社製,ライオンペーストW311N)150質量部と、自己乳化型シリコーン系消泡剤1質量部と、水500質量部とを混合して、含浸液Bを調製した。
2官能で分子量5,500の高純度ポリオール(プレミノールS‐4006,旭硝子(株)製,プロピレンオキシド(PO)鎖からなるポリオール、水酸基価=21.1mgKOH/g)100質量部と、イソホロンジイソシアネート6.69質量部(イソシアネート基/ポリオールの水酸基=8/5=1.60(モル比))と、ジブチルスズジラウレート0.01質量部とを、加温攪拌混合しながら、70℃で2時間反応させて、分子鎖の両末端にイソシアネート基を有するウレタンプレポリマーを合成した。
*2)新中村化学工業(株)製,AMO
*3)チバ・スペシャリティ・ケミカルズ(株)製,Irgacure 184
*4)関東化学(株)製,PMA
*5)大日本インキ化学工業(株)製,CFB101−40
ベタ部分のうち白抜き部分の次に印刷される色付き部分ABlankと、それ以外の色付き部分ASolidとの濃度差(ASolid−ABlank)を求めて、下記基準に従い評価した。その結果を、下記の表2〜5中に示す。なお、濃度差が正の値であればネガゴースト、負の値であればポジゴーストと併記する。
濃度差が±0.03以内の場合:◎(画質良)
濃度差が±0.04〜±0.05の場合:○(画質十分)
濃度差が±0.06〜±0.09の場合:△(画質不十分)
濃度差が±0.1以上の場合:×(画質不良)
ハーフトーン部分のうち白抜き部分の次に印刷される色付き部分BBlankと、それ以外の色付き部分BSolidとの濃度差(BSolid−BBlank)を求めて、前記と同様の基準に従い評価した。その結果を、下記の表6〜8中に示す。
2 接着層
3 弾性体層
10 トナー供給ローラ
11 画像形成体
12 現像ローラ
13 トナー供給ローラ
14 トナー収容部
15 成層ブレード
16 帯電ローラ
17 転写ローラ
18 クリーニング部
19 クリーニングブレード
20 トナー
30 平板
Claims (3)
- 非磁性トナーを用いたジャンピング現像方式に用いられるトナー供給ローラであって、22.5℃55%RHでの、100Vの電圧印加時における電気抵抗値が6.0〜8.2(logΩ)であることを特徴とするトナー供給ローラ。
- ポリウレタンフォームを基材とする請求項1記載のトナー供給ローラ。
- 非磁性トナーを用いたジャンピング現像方式の画像形成装置であって、請求項1または2記載のトナー供給ローラと、表面粗さ(Sm)が200〜300μmである現像ローラと、を備えることを特徴とする画像形成装置。
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| JP2011015514A JP5894366B2 (ja) | 2011-01-27 | 2011-01-27 | 画像形成装置 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014176851A1 (zh) * | 2013-04-28 | 2014-11-06 | 珠海市奔码打印耗材有限公司 | 一种激光打印机中的显影辊 |
| WO2019022025A1 (ja) * | 2017-07-24 | 2019-01-31 | 株式会社ブリヂストン | 導電性ウレタンフォーム及びトナー供給ローラ |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1069162A (ja) * | 1996-08-28 | 1998-03-10 | Matsushita Electric Ind Co Ltd | 非磁性一成分現像装置 |
| JP2007121567A (ja) * | 2005-10-26 | 2007-05-17 | Fuji Xerox Co Ltd | 現像装置及びこれを用いた画像形成装置 |
| JP2009008907A (ja) * | 2007-06-28 | 2009-01-15 | Canon Chemicals Inc | トナー供給ローラ |
| JP2009058736A (ja) * | 2007-08-31 | 2009-03-19 | Canon Inc | 現像装置とこれを備えた画像形成装置 |
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2011
- 2011-01-27 JP JP2011015514A patent/JP5894366B2/ja not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1069162A (ja) * | 1996-08-28 | 1998-03-10 | Matsushita Electric Ind Co Ltd | 非磁性一成分現像装置 |
| JP2007121567A (ja) * | 2005-10-26 | 2007-05-17 | Fuji Xerox Co Ltd | 現像装置及びこれを用いた画像形成装置 |
| JP2009008907A (ja) * | 2007-06-28 | 2009-01-15 | Canon Chemicals Inc | トナー供給ローラ |
| JP2009058736A (ja) * | 2007-08-31 | 2009-03-19 | Canon Inc | 現像装置とこれを備えた画像形成装置 |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014176851A1 (zh) * | 2013-04-28 | 2014-11-06 | 珠海市奔码打印耗材有限公司 | 一种激光打印机中的显影辊 |
| WO2019022025A1 (ja) * | 2017-07-24 | 2019-01-31 | 株式会社ブリヂストン | 導電性ウレタンフォーム及びトナー供給ローラ |
| JPWO2019022025A1 (ja) * | 2017-07-24 | 2020-07-16 | 株式会社ブリヂストン | 導電性ウレタンフォーム及びトナー供給ローラ |
| US11459440B2 (en) | 2017-07-24 | 2022-10-04 | Archem Inc. | Conductive urethane foam and toner supply roller |
| JP7189139B2 (ja) | 2017-07-24 | 2022-12-13 | 株式会社アーケム | 導電性ウレタンフォーム及びトナー供給ローラ |
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| JP5894366B2 (ja) | 2016-03-30 |
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