JPH03141369A - Electrophotographic offset master - Google Patents
Electrophotographic offset masterInfo
- Publication number
- JPH03141369A JPH03141369A JP25338490A JP25338490A JPH03141369A JP H03141369 A JPH03141369 A JP H03141369A JP 25338490 A JP25338490 A JP 25338490A JP 25338490 A JP25338490 A JP 25338490A JP H03141369 A JPH03141369 A JP H03141369A
- Authority
- JP
- Japan
- Prior art keywords
- image
- zinc oxide
- smoothness
- photosensitive layer
- good
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims abstract description 50
- 239000011787 zinc oxide Substances 0.000 claims abstract description 25
- 239000000126 substance Substances 0.000 claims 1
- 239000007788 liquid Substances 0.000 abstract description 19
- 239000011248 coating agent Substances 0.000 abstract description 16
- 238000000576 coating method Methods 0.000 abstract description 16
- 239000006185 dispersion Substances 0.000 abstract description 14
- 238000000034 method Methods 0.000 abstract description 9
- 239000002904 solvent Substances 0.000 abstract description 4
- 239000007787 solid Substances 0.000 abstract description 2
- 230000002542 deteriorative effect Effects 0.000 abstract 1
- 239000012530 fluid Substances 0.000 abstract 1
- 230000003313 weakening effect Effects 0.000 abstract 1
- 239000000463 material Substances 0.000 description 10
- 239000002245 particle Substances 0.000 description 4
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 108091008695 photoreceptors Proteins 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000007645 offset printing Methods 0.000 description 2
- 230000001235 sensitizing effect Effects 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- IICCLYANAQEHCI-UHFFFAOYSA-N 4,5,6,7-tetrachloro-3',6'-dihydroxy-2',4',5',7'-tetraiodospiro[2-benzofuran-3,9'-xanthene]-1-one Chemical compound O1C(=O)C(C(=C(Cl)C(Cl)=C2Cl)Cl)=C2C21C1=CC(I)=C(O)C(I)=C1OC1=C(I)C(O)=C(I)C=C21 IICCLYANAQEHCI-UHFFFAOYSA-N 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 238000001246 colloidal dispersion Methods 0.000 description 1
- -1 conductivity Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 229930187593 rose bengal Natural products 0.000 description 1
- 229940081623 rose bengal Drugs 0.000 description 1
- STRXNPAVPKGJQR-UHFFFAOYSA-N rose bengal A Natural products O1C(=O)C(C(=CC=C2Cl)Cl)=C2C21C1=CC(I)=C(O)C(I)=C1OC1=C(I)C(O)=C(I)C=C21 STRXNPAVPKGJQR-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Photoreceptors In Electrophotography (AREA)
- Printing Plates And Materials Therefor (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は電子写真方式によるオフセットマスターに関す
るものであシ、さらに詳しくは感光層に酸化亜鉛を使用
したオフセットマスターに関する発明である。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an offset master using an electrophotographic method, and more particularly to an offset master using zinc oxide in the photosensitive layer.
周知のように電子写真方式による複写方式はいわゆるエ
レクトロファックス方式と呼ばれ、電子写真感光層がベ
ースに塗布されておシ、この感光材料を帯電、露光、現
像、定着という工程を経て複写物を得る方式である。As is well known, the electrophotographic copying method is called the electrofax method, in which an electrophotographic photosensitive layer is coated on a base, and this photosensitive material is charged, exposed, developed, and fixed to produce a copy. This is the way to obtain it.
このような方式は一般の複写物のみならず、複写画像を
定着する前に普通紙に転写するマスターペーパーさらに
はオフセット印刷の原版オフセットマスター）としても
利用されている。This method is used not only for general copies, but also as master paper for transferring a copied image onto plain paper before fixing it, and also as an original offset master for offset printing.
近年、特に電子写真方式を用いたオフセットマスターは
取シ扱いの簡便さから急激に普及し使用されるようにな
った。またこのオフセットマスターは現像の方式から湿
式と乾式に分類されるが、現在のところ画質が良好とい
う理由で湿式が多く使用されるようになりて来ている。In recent years, offset masters using an electrophotographic method have rapidly become popular and used because of their ease of handling. Furthermore, this offset master is classified into wet type and dry type based on the developing method, but wet type is currently being used more often because of its better image quality.
湿式現像方式はいわゆる液体トナーを用いて現像する方
式であり、良好なる画質、画像を得るためには現像剤で
ある液体トナーの検討も必要であるが、印刷の原版とな
るオフセットマスター材料からの検討が非常に重要であ
る。特にオフセットマスター材料は複写物の中でもより
良好な画質、画像が要求される。良好なる画質、画像を
得る友めのオフセットマスター材料トしては一般紙、レ
ジンコーテツド紙及びフィルムなどのベースが均一性を
有すること、良好なる耐溶剤性を有すること、適当なる
導電性を有することなどの条件が必須となるがさらに感
光層である酸化亜鉛層の面からは良好な画質、画像を形
成する友め酸化亜鉛と共に使用するバインダーの選択も
重要な事項である。友だし、これらの諸条件を満たした
上でも良好なる画質、画像な常に安定して得ることは難
しい。これは液体トナーといり非常に微小な粒子を有ｆ
Ｒ浴媒中に分散させたコロイド分散物で現像するとき感
光層の表面状態が画像の形成に非常に大きな影響を与え
るためである。The wet development method is a method of development using so-called liquid toner, and in order to obtain good image quality and images, it is necessary to consider the liquid toner that is the developer, but it is also necessary to consider the liquid toner used as the developer. Consideration is very important. In particular, offset master materials are required to have better image quality and images than other copies. For good image quality, the offset master material used to obtain the image must have a base of general paper, resin-coated paper, film, etc., which has uniformity, good solvent resistance, and suitable conductivity. These conditions are essential, but from the viewpoint of the zinc oxide layer, which is a photosensitive layer, it is also important to have good image quality and the selection of a binder to be used together with zinc oxide, the friend that forms images. However, even if these conditions are met, it is difficult to consistently obtain good quality images. This is liquid toner and contains very small particles.
This is because the surface condition of the photosensitive layer has a very large effect on image formation when developing with a colloidal dispersion dispersed in an R bath medium.
過去の事例では感光層である酸化亜鉛層の表面状態に注
目し特に検討を加えたものはなく、α化亜鉛を含む塗布
液を適当に分散しベース上に塗布しオフセットマスター
材料を作成しているにすぎなかった。In the past cases, there were no special studies focusing on the surface condition of the zinc oxide layer, which is a photosensitive layer, and an offset master material was created by appropriately dispersing a coating solution containing zinc pregelatide and coating it on the base. It was just there.
本発明は上記の諸条件を満几し友上で、さらに良好なる
画質、画像を得るようにし７？Ｊのである。即ち、本発
明は感光層でるる酸化亜鉛層の異面平滑性に注目したも
ので液体トナーで現像した場合、良好なる画質、画像を
供給することを目的とする。The present invention satisfies the above conditions and allows even better image quality and images to be obtained on the computer. It's J's. That is, the present invention focuses on the unique smoothness of the zinc oxide layer that is a photosensitive layer, and aims to provide an image with good quality when developed with a liquid toner.
以下本発明の詳細な説明する。The present invention will be explained in detail below.
感光層には感光体である酸化亜鉛のほかに、バインダー
、増感色素、さらにはこれらの浴媒として有機溶剤など
が使用される。これらをただ混合しベース上に塗布して
も感光体でおる酸化亜鉛の分散が不光分で良好なる画質
、画像を得ることは困難である０このため酸化亜鉛を含
む上記混合物（以下酸化亜鉛塗液と称する）を分散する
という１根を経ることが一般的で４７５酸化亜鉛塗液な
分散する方法としてはサンドグラインダー、アトライタ
ー、ボールミル、振動ミル、超音波、高速攪拌機などの
装置が使用されているが酸化亜鉛の粗大粒子の発生が少
な（、はぼ均一の粒度分布を作シやすいサンドグライン
ダーが多（使用されている。このような分数装置で分散
され７（酸化亜鉛塗液はベース上にロールコータ−、エ
アナイフ、メイヤーバーなどの塗布装置によシ塗布され
、乾燥された後にオフセットマスター材料となる。この
場合酸化亜鉛塗液は「適当なる分散性」を有することが
必要であり、また塗布、乾燥後に形成される感光層であ
る酸化亜鉛層も「適当なる平滑性」を有することが必要
である。ここで酸化亜鉛塗液の分散性を考えてみると、
上述したように分散を行なわない場合や、分散が不充分
の場合にはベース上に形成された感光層は酸化亜鉛の結
粒な生じてしまいこれをオフセットマスター材料トして
用いた場合には、良好なる画質、ｍ像が得られず荷に細
線が飛ぶという現象を生ずるようになる。このような状
態ではオフセットマスター材料としては使用することは
出来ない。一方分散ン必要以上に行なりｔ場合（過分散
状態）には感光体でろる醸化亜鉛が破壊されてしまい、
コロナ２ｉ！電を行なった場合の感光層の帯電量が充分
でな（現遣時の液体トナーの付着が少な（なり画像濃度
の低下をき九す。また分散が過分散の状態でなくても、
感光層の表面平滑性が良好すぎると、液体トナーで現像
した場合トナー粒子は定着時に付着の弱い状態となシ像
流れ現象を生ずるようになる。このような現＊は黒ベタ
部分に顕著に表われやすい。このように酸化亜鉛の感光
層をオフセットマスター材料として用いる場合、特に液
体トナーで現像する場合には、酸化亜鉛塗液の分散状態
は単に分散が不足でなくかつ過剰でないという条件では
良好なる画質、画像を得るのに不充分であシ、ま、、ｆ
！、−常に品質の安定した製品を作ることは出来ない。In addition to zinc oxide, which is a photoreceptor, the photosensitive layer uses a binder, a sensitizing dye, and an organic solvent as a bath medium for these. Even if these are simply mixed and coated on the base, it is difficult to obtain good image quality and images due to the dispersion of zinc oxide in the photoreceptor. Generally speaking, one step is to disperse the 475 zinc oxide coating liquid, and devices such as sand grinders, attritors, ball mills, vibration mills, ultrasonic waves, and high-speed stirrers are used to disperse the 475 zinc oxide coating liquid. However, a sand grinder is often used because it produces fewer coarse particles of zinc oxide, and it is easy to create a uniform particle size distribution. It is applied onto the surface using a coating device such as a roll coater, an air knife, or a Meyer bar, and becomes an offset master material after drying.In this case, the zinc oxide coating liquid must have "appropriate dispersibility." In addition, the zinc oxide layer, which is a photosensitive layer formed after coating and drying, must also have "appropriate smoothness."If we consider the dispersibility of the zinc oxide coating liquid,
As mentioned above, if dispersion is not carried out or if dispersion is insufficient, the photosensitive layer formed on the base will have zinc oxide particles, and if these are used as an offset master material, , good image quality or m-image cannot be obtained, resulting in the phenomenon of thin lines flying on the load. In such a state, it cannot be used as an offset master material. On the other hand, if the dispersion is carried out more than necessary (over-dispersed state), the dissolved zinc in the photoreceptor will be destroyed.
Corona 2i! If the amount of charge on the photosensitive layer is insufficient when electrification is carried out (liquid toner adheres less during on-site use), this will lead to a decrease in image density.
If the surface smoothness of the photosensitive layer is too good, when developed with a liquid toner, the toner particles will be in a weak state of adhesion during fixing, resulting in an image washout phenomenon. This type of appearance * tends to appear prominently in solid black areas. In this way, when a photosensitive layer of zinc oxide is used as an offset master material, especially when developing with a liquid toner, the dispersion state of the zinc oxide coating liquid can provide good image quality as long as the dispersion is neither insufficient nor excessive. It is insufficient to obtain an image.
! -It is not possible to always produce products with stable quality.
良好なる画質、画像を得るためにはさらにある一定の条
件が必要である。本発明者はこれら条件を見つけるべく
鋭意検討した結果、次のような条件で酸化亜鉛塗液を分
散し、感光層を形成することが良好なる画質、画像を与
えることでるることを見い出し本発明を完成するに至っ
九。In order to obtain images of good quality, certain conditions are also required. As a result of intensive studies to find these conditions, the present inventor found that dispersing a zinc oxide coating liquid under the following conditions to form a photosensitive layer can provide a good image quality and the present invention. I have completed nine.
即ち本発明は酸化亜鉛塗液を分散後、導電性、耐水性、
耐溶剤性等を付与されたベースに翅布し、酸化亜鉛の感
光層を形成し九ときの表面がＪ工Ｓ−Ｐ８１１９による
平滑度が１００〜５００秒で更に好ましくは４００〜５
００秒の数値範囲に入るようにしたものである。これら
の数値よシ小さな値では前に記述したように分散状態が
悪く＃１線が飛ぶ恐れかめシま友数値が大きい場合には
、分散が強すぎる状態であシ、コロナ帯電時の電荷の乗
シが不充分となｒ ｉｉ＠濃度の低下となるばかシでな
く、画＠ＩＣ）黒べ九部分でトナーの付着が感光層の表
面が平滑すぎるたａＯＳ流れを来たす原因となる。なお
上記ペック平滑度はスムースター式平滑度測定機（東英
電子工業＃りの場合５０〜３５０ｍＨｊｌ の数値範囲
に入ることが必要である。That is, in the present invention, after dispersing the zinc oxide coating liquid, conductivity, water resistance,
A photosensitive layer of zinc oxide is formed on a base imparted with solvent resistance, etc., and the surface has a smoothness of 100 to 500 seconds, more preferably 400 to 5, according to J-Ko S-P8119.
It is set to fall within the numerical range of 00 seconds. If the value is smaller than these values, the dispersion state is poor and the #1 line may fly as described above.If the value is large, the dispersion is too strong and the charge during corona charging is Not only is insufficient multiplication resulting in a decrease in density, but also the adhesion of toner in the black areas (image @IC) causes aOS flow because the surface of the photosensitive layer is too smooth. In addition, the above-mentioned Peck smoothness must fall within the numerical range of 50 to 350 mHjl in the case of a Smoostar type smoothness measuring machine (Toei Electronics Co., Ltd.).
以下本発明を具体的な実施例よ）詳細に説明する、っ
実施例１゜
酸化亜鉛（堺化学製すゼックス＄２０００ ）とアクリ
ル系樹脂、溶剤トルエ／をよく攪拌後、分散機としてサ
ンドグラインダー（五十嵐機械裂造！Ｒ）にかけ分散条
件を変えた塗液を作成した。The present invention will be described in detail below with specific examples.Example 1: Zinc oxide (ZEX $2000, manufactured by Sakai Chemical Co., Ltd.), acrylic resin, and solvent toluene were thoroughly stirred, and then a sand grinder was used as a dispersion machine. (Igarashi Kikai Rizo!R) to create coating liquids with different dispersion conditions.
この塗液に増感色素としてローズベンガルを添泥
加しよ（攪拌後、導電性、得溶剤性、耐水性を施した基
紙にワイヤーバーで乾燥後の塗布臘が２５Ｉｌｌになる
ように塗布し、９０℃の熱風乾燥を行なり友。出来上が
った酸化亜鉛層の表面なペック式平滑度測定機（ペック
スムースネスタ；熊谷理機工業製）で測定し次結果とこ
のオフセットマスター材料を製版機、ダイヤファックス
ｚｐ−ｉ１（三菱製紙製）で液体トナー、ＬＯＭ−ＫＤ
（三菱製紙Ｉａ）を用いて製版し友結果を下記に示す。Add rose bengal as a sensitizing dye to this coating solution. Then, dry with hot air at 90℃.The surface of the finished zinc oxide layer was measured with a Peck type smoothness measuring machine (Peck Smooth Nesta; manufactured by Kumagai Riki Kogyo) and the following results and this offset master material were transferred to a plate making machine. , Diafax zp-i1 (manufactured by Mitsubishi Paper Industries), liquid toner, LOM-KD
(Mitsubishi Paper Industries Ia) was used to make a plate and the results are shown below.
上記のように本発明品は良好な製版画質、画像を有して
いる。ま九本発明品をオフセット印刷機にかけて印刷を
してみ友ところ非常に良好なる印刷物を得ることが出来
た。As mentioned above, the product of the present invention has good plate-making image quality and image. When I printed the product of the present invention using an offset printing machine, I was able to obtain very good printed matter.
実施例２゜
実施例１と同様な原材料を用いて、酸化亜鉛塗液の分散
機として超音波洗滌機（超音波洗滌機）を用いて分散を
行なった。これを実施例１と同様に基紙上に塗布し転線
してオフセットマスター 材ａをｎた。ペックスムース
ネステスターで感光層の平滑性を測定した。結果を下記
に示す。Example 2 Using the same raw materials as in Example 1, dispersion was carried out using an ultrasonic washer (ultrasonic washer) as a dispersion machine for zinc oxide coating liquid. This was applied onto a base paper in the same manner as in Example 1, and the line was transferred to obtain an offset master material a. The smoothness of the photosensitive layer was measured using a Pex smoothness tester. The results are shown below.
好なる印刷物が得られた。Good printed matter was obtained.
Claims (1)
オフセットマスターに於て、該マスターの最上層表面の
平滑度がベック平滑度で１００〜５００秒（ＪＩＳ−Ｐ
８１１９）の範囲であることを特徴とする電子写真オフ
セットマスター。 ２ ベック平滑度が４００〜５００秒である特許請求の
範囲第１項記載の電子写真オフセットマスター。[Claims] 1. In an electrophotographic offset master using zinc oxide as an inorganic photoconductive substance, the surface smoothness of the uppermost layer of the master is 100 to 500 seconds in Bekk smoothness (JIS-P
8119). 2. The electrophotographic offset master according to claim 1, which has a Beck smoothness of 400 to 500 seconds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25338490A JPH03141369A (en) | 1990-09-21 | 1990-09-21 | Electrophotographic offset master |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25338490A JPH03141369A (en) | 1990-09-21 | 1990-09-21 | Electrophotographic offset master |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03141369A true JPH03141369A (en) | 1991-06-17 |
Family
ID=17250616
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25338490A Pending JPH03141369A (en) | 1990-09-21 | 1990-09-21 | Electrophotographic offset master |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03141369A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5644690A (en) * | 1979-09-20 | 1981-04-23 | Ricoh Co Ltd | Original form for offset printing |
| JPS57186756A (en) * | 1981-05-13 | 1982-11-17 | Mitsubishi Paper Mills Ltd | Improved electrophotographic photosensitive material |
-
1990
- 1990-09-21 JP JP25338490A patent/JPH03141369A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5644690A (en) * | 1979-09-20 | 1981-04-23 | Ricoh Co Ltd | Original form for offset printing |
| JPS57186756A (en) * | 1981-05-13 | 1982-11-17 | Mitsubishi Paper Mills Ltd | Improved electrophotographic photosensitive material |
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