JPH02230275A - Formation of image on transfer sheet having inferior oil absorptivity with liquid developer - Google Patents
Formation of image on transfer sheet having inferior oil absorptivity with liquid developerInfo
- Publication number
- JPH02230275A JPH02230275A JP5151489A JP5151489A JPH02230275A JP H02230275 A JPH02230275 A JP H02230275A JP 5151489 A JP5151489 A JP 5151489A JP 5151489 A JP5151489 A JP 5151489A JP H02230275 A JPH02230275 A JP H02230275A
- Authority
- JP
- Japan
- Prior art keywords
- image
- sheet
- oil
- transfer sheet
- absorbing
- 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.)
- Granted
Links
- 239000007788 liquid Substances 0.000 title claims abstract description 17
- 230000015572 biosynthetic process Effects 0.000 title description 2
- 238000000034 method Methods 0.000 claims description 18
- 238000010521 absorption reaction Methods 0.000 claims description 16
- 239000000463 material Substances 0.000 abstract description 2
- 239000002245 particle Substances 0.000 abstract description 2
- 239000000853 adhesive Substances 0.000 abstract 1
- 230000001070 adhesive effect Effects 0.000 abstract 1
- 238000005562 fading Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 108091008695 photoreceptors Proteins 0.000 description 2
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
Landscapes
- Fixing For Electrophotography (AREA)
Abstract
Description
〔技術分野〕
本発明は画像形成方法に関し、詳しくは、液体現像剤に
よる吸油性の悪い転写シートへの画像形成方法に関する
。
〔従来技術〕
静電写真法における現像手段としては、大別して、液体
現像剤を用いる方法、乾式現像剤を用いる方法とが知ら
れている。これらは、いずれも長所・短所をもち併せて
いるが、鮮明画像を形成するうえでは液体現像剤の使用
が有利である。
ところで，液体現像剤によって転写シート上に形成され
た未定着トナー画像は，熱ローラ及び加圧ローラの間を
通されて（未定着トナー画像が熱ローラに接するように
通されて）定着されるのが普通である。だが、液体現像
剤は、本来、油性担体液中にトナーを分散させたものか
ら構成されているため，現像に際してはトナーが担体液
とともに感光体上の静電荷像部に付着し、これが転写シ
ートへと移されることから、転写シートにはトナーとと
もに担体液も移行される。従ってこの状態の転写シート
が熱ローラにより加熱定着された時には、転写シートが
吸油性のものであれば問題は生じないものの，転写シー
トが吸油性の悪いものではトナー画像が担体液とともに
流されて画像が崩れる所謂「像流れ現象」が起るといっ
た不都合が生じる．もっとも、湿式現像法により得られ
たトナー画像を熱ローラで定着しようとする試みは、例
えば特開昭５３−７６０４２号、特開昭５３ − ２２
４４０号などの公報で提案されているが、ＯＨＰ （オ
ーバーヘッドプロジェクター）用フィルムのごとき吸油
性の悪い転写シ一トににみられる特有の像流れ現象につ
いては配慮されていないのが実情である。
〔目 的〕
本発明は吸油性の悪い転写シートを用いて熱ローラ定着
を行なっても像流れ現象は起らず、良質のトナー画像が
得られる画像形成方法を提供するものである６[Technical Field] The present invention relates to an image forming method, and more particularly to a method for forming an image on a transfer sheet with poor oil absorption using a liquid developer. [Prior Art] Developing means in electrostatic photography are broadly classified into methods using a liquid developer and methods using a dry developer. All of these have their advantages and disadvantages, but the use of liquid developers is advantageous in forming clear images. By the way, the unfixed toner image formed on the transfer sheet by the liquid developer is passed between a heat roller and a pressure roller (the unfixed toner image is passed so as to be in contact with the heat roller) and fixed. is normal. However, since liquid developers are originally composed of toner dispersed in an oil-based carrier liquid, during development, the toner adheres to the electrostatically charged image area on the photoconductor along with the carrier liquid, and this is transferred to the transfer sheet. Since the toner is transferred to the transfer sheet, the carrier liquid is also transferred to the transfer sheet along with the toner. Therefore, when a transfer sheet in this state is heated and fixed by a hot roller, no problem will occur if the transfer sheet is oil-absorbing, but if the transfer sheet is poorly oil-absorbing, the toner image may be washed away with the carrier liquid. This causes problems such as the so-called "image drift phenomenon" in which the image is distorted. However, attempts to fix a toner image obtained by a wet development method using a heated roller are disclosed in, for example, JP-A-53-76042 and JP-A-53-22.
Although this method has been proposed in publications such as No. 440, the actual situation is that it does not take into account the image drift phenomenon peculiar to transfer sheets with poor oil absorption such as OHP (overhead projector) films. [Purpose] The present invention provides an image forming method that does not cause image fading even when hot roller fixing is performed using a transfer sheet with poor oil absorption and that provides a high-quality toner image6.
本発明は湿式現像による吸油性の悪い転写シートへの画
像形成方法において、吸油性シート又は吸油性の悪い転
写シート上に湿式トナー画像を形成した後、この未定着
トナー画像が吸油性の悪い転写シート上に形成されてい
る場合には未定着トナー画像面に吸油性シートを重ね、
また、前記未定着トナー画像が吸油性シート上，に形成
されている場合には未定着トナー画像面に吸油性の悪い
転写シートを重ね、この状態のものを熱ローラを通して
定着し，続いて、これらの吸油性シート，吸油性の悪い
転写シートを剥して，前記吸油性の悪い転写シート上に
、又は、吸油性シート及び吸油性の悪い転写シート上に
画像を得ることを特徴としている。
以下に、本発明方法を図面に従がいながら更に詳細に説
明する。図面（第１図）は、本発明方法の概略を説明す
るための図であって，１は熱ローラ，２は加圧ローラ、
４はガイドコロ、５はロール状に巻かれたシート（吸油
性シート，吸油性の悪い転写シートのいずれか一方のシ
ート）、７はガイド板を表わしている．
ガイド板７上に送られてきた未定着画像を有する吸油性
の悪い転写シート（図示されていない）の画像面には，
吸油性シ一ト５が前記画像面（又は前記転写シート）の
大きさに合わせた大きさにカッター６で切られ押え治具
８の助けによって重ねられ、その状態のものが熱ローラ
１と加圧ローラ２との間に通されるようになっている。
なお，末定着画像を有する吸油性の悪い転写シートと，
吸油性シートとの位置が逆であってもかまわないことは
後記から理解されるものである。
湿式現像法を採用した場合には、受像シート上に形成さ
れた湿式トナー画像（未定着画像）を加熱定着する手段
としては幾つかあげられるが、熱ロールによるのが消費
熱量即ち消費電力が少ないため省エネルギーの点で有利
であり、また、高速連続複写が可能な点でも好ましい．
本発明方法においても、そうしたことを考慮して、熱ロ
ール定着手段を採用している。
しかし、先に触れたとおり，湿式現像により受像シート
上に形成された湿式トナー画像には可成りの担体液が含
ま九でおり，転写シート（受像シート）が吸油性の悪い
ものでは像流れ現象が発生する。
このような不都合を解消するために、本発明方゜法では
次の■又は■のいずれかの手段が採用される。
■受像シートが吸油性の悪い転写シートであって、その
転写シート上に未定着画像が形成された場合には・、未
定着画像面に吸油性シートを重ね、その状態のものを熱
ローラと加圧ローラとの間に通して定着した後、これら
二枚のシートを分離する。
■受像シートが吸油性シートであって、その吸油性シー
ト上に未定着湿式トナー画像が形成された場合には、未
定着画像面に吸油性の悪いシートを重ね、その状態のも
のを熱ローラと加圧ローラとの間に通して定着した後、
これら二枚のシートを分離する。
かかる手段が採られたことにより、前記■の場合には、
吸油性シートに未定着湿式トナー画像中のほとんどの担
体液が吸収され、また、トナー粒子の接着性等から像流
れ現象を起すことなく、吸油性の悪い転写シート上には
良質の画像が形成されるようになる。一方，前記■の場
合には、吸油性シート上には正像が形成されるとともに
、吸油性の悪い転写シート上には逆像が形成される。こ
の逆像は鮮明ではあるが，濃度の点で前記のよりは劣る
ものである．なお、本発明方法でいうところの「吸油性
シート」及び「吸油性シ一ト」とは多分に相対的なもの
であって，未定着画像を形成している湿式トナー中の担
体液をどの程度吸収できるかが判断の基礎となっている
。従って、大まかにいえば、次のようなものである．
（イ）吸油性シートとは滴下された油滴が接触角をもた
ず、数十ｍ秒のうちにシート内に吸収されるシートを意
味し、その具体例としてはＰＰＣ用紙、和紙，ラグ紙な
どがあげられる。
（口）吸油性の悪い転写シートとは滴下された油滴が接
触角をもって安定し、数秒の間はシート内に吸収されな
いシートを意味し、その具体例としてはコート紙、合成
紙、樹脂フィルムなどがあげられる。
次に実施例を示す。
実施例１
市販の湿式電子写真複写機及び液体現像剤（リコー社製
ＣＴ−５０８５）によって感光体上の静電荷像の顕像化
を行ない、この湿式トナー像を市販のＯＨＰ用シートに
転写した。
この転写シート（ＯＨＰ用シート）の上の湿式トナー面
にＰＰＣ用紙を重ね、この状態のものを表面温度約１２
０℃の熱ローラによって熱圧着定着を行なった後、転写
シートとＰＰＣ用紙を剥したところ，像流れのない良質
の画像（濃度約１．２）がＯＨＰ用シートに得られた。
なお、熱ローラの表面温度を約１５０℃に上げた以外は
まったく同様にしてＯＨＰ用シートに画像を形成させた
ところ、この画像は濃度が１．３でより良質のものとな
った。
実施例２
実施例１において， ＯＨＰ用シートとＰＰＣ用紙との
位置を変えた（感光体からの湿式トナー像をＰＰＣ用紙
に転写し、この上にＯＨＰ用シートを重ね、この状態の
ものを熱圧着定着した）以外はまったく同様にして画像
形成を行なった。
この結果、ＯＨＰ用シートには像流れのない鮮明な逆像
の画像（濃度約１．０）が得られた。これを市販の投影
機により像を写し出すと良好な投影拡大像が出現した。
なお． ｒｐｃ用紙には正像の画像（濃度約１．０）が
得られた。
〔効 果〕
本発明方法によれば、Ｏ｝ＩＰ用フィルム等の非吸油性
の悪い転写シートへの湿式現像であっても、担体液を定
着前又は定着時に他のものに吸収させておくことにより
、像流れのない良質の画像が形成できる。The present invention is a method for forming an image on a transfer sheet with poor oil absorption by wet development, after forming a wet toner image on an oil absorption sheet or a transfer sheet with poor oil absorption, this unfixed toner image is transferred to a transfer sheet with poor oil absorption. If the toner is formed on a sheet, an oil-absorbing sheet is placed over the unfixed toner image surface,
In addition, when the unfixed toner image is formed on an oil-absorbing sheet, a transfer sheet with poor oil-absorbing properties is superimposed on the unfixed toner image surface, and this state is fixed by passing it through a heat roller, and then, The method is characterized in that these oil-absorbing sheets and transfer sheets with poor oil-absorbing properties are peeled off to obtain images on the transfer sheets with poor oil-absorbing properties, or on the oil-absorbing sheets and transfer sheets with poor oil-absorbing properties. The method of the present invention will be explained in more detail below with reference to the drawings. The drawing (Fig. 1) is a diagram for explaining the outline of the method of the present invention, in which 1 is a heat roller, 2 is a pressure roller,
4 is a guide roller, 5 is a rolled sheet (either an oil-absorbing sheet or a transfer sheet with poor oil-absorbing properties), and 7 is a guide plate. On the image surface of a transfer sheet (not shown) with poor oil absorption and having an unfixed image sent onto the guide plate 7,
The oil-absorbing sheet 5 is cut with a cutter 6 to a size that matches the size of the image surface (or the transfer sheet) and is stacked with the help of a pressing jig 8. It is designed to be passed between the pressure roller 2 and the pressure roller 2. In addition, a transfer sheet with poor oil absorption that has a partially fixed image,
It will be understood from the description below that the position with respect to the oil-absorbing sheet may be reversed. When a wet development method is adopted, there are several ways to heat and fix the wet toner image (unfixed image) formed on the image receiving sheet, but using a heated roll consumes less heat and power. Therefore, it is advantageous in terms of energy saving and is also preferable in that it allows high-speed continuous copying.
The method of the present invention also takes this into consideration and employs a hot roll fixing means. However, as mentioned earlier, the wet toner image formed on the image-receiving sheet by wet development contains a considerable amount of carrier liquid, and if the transfer sheet (image-receiving sheet) has poor oil absorption, image fading may occur. occurs. In order to eliminate such inconveniences, the method of the present invention adopts either of the following means (1) or (2). ■If the image-receiving sheet is a transfer sheet with poor oil absorption and an unfixed image is formed on the transfer sheet, place an oil-absorbing sheet on the unfixed image surface and transfer the sheet to a heat roller. After being fixed by passing between the sheets and a pressure roller, these two sheets are separated. ■If the image-receiving sheet is an oil-absorbing sheet and an unfixed wet toner image is formed on the oil-absorbing sheet, place a sheet with poor oil absorption on the unfixed image surface and transfer the sheet to a hot roller. After passing it between the roller and the pressure roller and fixing it,
Separate these two sheets. By taking such measures, in the case of (■) above,
Most of the carrier liquid in the unfixed wet toner image is absorbed by the oil-absorbing sheet, and a high-quality image is formed on the transfer sheet, which has poor oil-absorbing properties, without causing image fading due to the adhesion of toner particles. will be done. On the other hand, in the case (2) above, a normal image is formed on the oil-absorbing sheet, and a reverse image is formed on the transfer sheet with poor oil-absorbing properties. Although this inverse image is clear, it is inferior to the above image in terms of density. Note that the terms "oil-absorbing sheet" and "oil-absorbing sheet" used in the method of the present invention are relative to each other, and it is important to note that the terms "oil-absorbing sheet" and "oil-absorbing sheet" are relative to each other. The basis of judgment is whether the amount can be absorbed. Therefore, roughly speaking, it is as follows. (b) Oil-absorbing sheet means a sheet in which dropped oil droplets have no contact angle and are absorbed into the sheet within a few tens of milliseconds. Specific examples include PPC paper, Japanese paper, and rugs. Examples include paper. (Example) A transfer sheet with poor oil absorption means a sheet in which dropped oil droplets are stabilized with a contact angle and are not absorbed into the sheet for several seconds.Specific examples include coated paper, synthetic paper, and resin film. etc. Next, examples will be shown. Example 1 An electrostatic charge image on a photoreceptor was visualized using a commercially available wet-type electrophotographic copying machine and a liquid developer (CT-5085 manufactured by Ricoh), and this wet-type toner image was transferred to a commercially available OHP sheet. . PPC paper is placed on the wet toner surface of this transfer sheet (OHP sheet), and the surface temperature of the sheet in this state is approximately 12
After thermocompression fixing was performed using a heated roller at 0° C., when the transfer sheet and PPC paper were peeled off, a good quality image (density about 1.2) without image fading was obtained on the OHP sheet. When an image was formed on an OHP sheet in exactly the same manner except that the surface temperature of the heat roller was raised to about 150° C., the image had a density of 1.3 and was of better quality. Example 2 In Example 1, the positions of the OHP sheet and the PPC paper were changed (the wet toner image from the photoreceptor was transferred to the PPC paper, the OHP sheet was placed on top of this, and the sheet in this state was heated). Image formation was carried out in exactly the same manner except that the image was fixed by pressure bonding. As a result, a clear reversed image (density approximately 1.0) without image blur was obtained on the OHP sheet. When an image of this was projected using a commercially available projector, a good projected enlarged image appeared. In addition. A normal image (density approximately 1.0) was obtained on the RPC paper. [Effects] According to the method of the present invention, even in wet development on a transfer sheet with poor oil absorption properties such as an IP film, the carrier liquid can be absorbed by another material before or during fixing. As a result, a high-quality image without image blur can be formed.
第１図は本発明方法の実施に効果的な装置の一例の概略
図である。FIG. 1 is a schematic diagram of an example of an apparatus effective for carrying out the method of the present invention.
Claims (1)
トナー画像を形成した後、この未定着トナー画像が吸油
性の悪い転写シート上に形成されている場合には未定着
トナー画像面に吸油性シートを重ね、また、前記未定着
トナー画像が吸油性シート上に形成されている場合には
未定着トナー画像面に吸油性の悪い転写シートを重ね、
この状態のものを熱ローラーを通して定着し、続いて、
これらの吸油性シート、吸油性の悪い転写シートを剥し
て、前記吸油性の悪い転写シート上に、又は、吸油性シ
ート及び吸油性の悪い転写シート上に画像を得ることを
特徴とする液体現像剤による吸油性の悪い転写シートへ
の画像形成方法。1. After forming a wet toner image on an oil-absorbing sheet or a transfer sheet with poor oil-absorbing properties, if this unfixed toner image is formed on a transfer sheet with poor oil-absorbing properties, the surface of the unfixed toner image absorbs oil. If the unfixed toner image is formed on an oil-absorbing sheet, a transfer sheet with poor oil absorption is overlaid on the unfixed toner image surface,
This state is fixed by passing it through a heat roller, and then
Liquid development characterized by peeling off these oil-absorbing sheets and transfer sheets with poor oil-absorbing properties to obtain images on the transfer sheets with poor oil-absorbing properties, or on oil-absorbing sheets and transfer sheets with poor oil-absorbing properties. A method for forming images on transfer sheets with poor oil absorption using agents.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5151489A JP2774549B2 (en) | 1989-03-03 | 1989-03-03 | Image forming method for transfer sheet with poor oil absorption by liquid developer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5151489A JP2774549B2 (en) | 1989-03-03 | 1989-03-03 | Image forming method for transfer sheet with poor oil absorption by liquid developer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02230275A true JPH02230275A (en) | 1990-09-12 |
| JP2774549B2 JP2774549B2 (en) | 1998-07-09 |
Family
ID=12889116
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5151489A Expired - Fee Related JP2774549B2 (en) | 1989-03-03 | 1989-03-03 | Image forming method for transfer sheet with poor oil absorption by liquid developer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2774549B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5404209A (en) * | 1993-01-13 | 1995-04-04 | Fuji Xerox Co., Ltd. | Apparatus and method for forming images which are treated with an oil absorbent |
| US6785495B2 (en) * | 2002-09-13 | 2004-08-31 | Samsung Electronics Co., Ltd. | Apparatus and method for removing carrier liquid from an intermediate transfer member surface or from a toned image on an intermediate transfer member |
-
1989
- 1989-03-03 JP JP5151489A patent/JP2774549B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5404209A (en) * | 1993-01-13 | 1995-04-04 | Fuji Xerox Co., Ltd. | Apparatus and method for forming images which are treated with an oil absorbent |
| US6785495B2 (en) * | 2002-09-13 | 2004-08-31 | Samsung Electronics Co., Ltd. | Apparatus and method for removing carrier liquid from an intermediate transfer member surface or from a toned image on an intermediate transfer member |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2774549B2 (en) | 1998-07-09 |
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|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |