JPH05341553A - Electrophotographic transfer paper - Google Patents
Electrophotographic transfer paperInfo
- Publication number
- JPH05341553A JPH05341553A JP16828192A JP16828192A JPH05341553A JP H05341553 A JPH05341553 A JP H05341553A JP 16828192 A JP16828192 A JP 16828192A JP 16828192 A JP16828192 A JP 16828192A JP H05341553 A JPH05341553 A JP H05341553A
- Authority
- JP
- Japan
- Prior art keywords
- paper
- transfer paper
- density
- curl
- fixing
- 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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、間接乾式電子写真方式
のフルカラー、若しくは、モノクローム複写機、プリン
ター等に用いられて、高画質な画像が得られ、かつ、カ
ールの小さい転写紙に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer paper used in an indirect dry electrophotographic full-color or monochrome copying machine, a printer or the like to obtain a high-quality image and with a small curl.
【０００２】[0002]
【従来の技術】近年、電子写真方式の複写機、プリンタ
ーのカラー化、デジタル化等に伴い、電子写真方式の複
写機やプリンター等の高画質化が検討されてきている。
特に、電子写真方式のフルカラー複写機やプリンターに
おいては、高画質画像を得るために、画像の入出力のデ
ジタル化が進み、画像入力方法及び入力した画像の処理
方法や、現像法、転写法、定着法等が大きく改善されて
いる。また、現像剤や感光体の画像形成材料について
も、デジタル高精細、高発色カラー記録に対応して改善
されている。2. Description of the Related Art In recent years, along with colorization and digitization of electrophotographic copying machines and printers, improvement in image quality of electrophotographic copying machines and printers has been studied.
In particular, in electrophotographic full-color copying machines and printers, in order to obtain high-quality images, digitization of image input / output progresses, image input methods and input image processing methods, development methods, transfer methods, The fixing method has been greatly improved. Further, the development of image forming materials such as developers and photoconductors has been improved corresponding to digital high definition and high color development color recording.
【０００３】しかしながら、電子写真方式のモノクロー
ム複写機やプリンターに使用されている従来の電子写真
用紙を、上記の改善された電子写真方式のフルカラー複
写機やプリンターに使用すると、写真画像等に多く存在
する中間調領域での粒状性（画像のざらつき感）が悪
く、高画像密度領域では濃度のむらが目立ち、また、彩
度が低くカラー発色性に劣るという問題があった。ま
た、フルカラー複写、プリントの場合には、写真画像等
の画像面積率の大きな画像が紙上に形成されることが多
く、画像面積率の小さな画像と比較して、熱加圧定着後
に比べものにならないほど大きなカールが生じるという
問題があった。このような定着工程後の大きなカール
は、ドキュメントとしての取扱性が悪いばかりでなく、
排紙トレイやソーターへの収容性不良が生じ、この収容
性不良に起因する種々のトラブルの原因になっていた。However, when the conventional electrophotographic paper used in the electrophotographic monochrome copying machine or printer is used in the above improved electrophotographic full-color copying machine or printer, it is often present in photographic images. There is a problem that the graininess (roughness of the image) in the halftone region is poor, uneven density is conspicuous in the high image density region, and the saturation is low and the color developability is poor. Further, in the case of full-color copying or printing, an image having a large image area ratio such as a photographic image is often formed on the paper, which is not comparable to an image having a small image area ratio after heat and pressure fixing. There is a problem that a large curl occurs. Such a large curl after the fixing process not only makes it difficult to handle as a document, but also
Poor accommodation in the discharge tray or sorter has been a cause of various troubles caused by the poor accommodation.
【０００４】ところで、特開昭６２−１９８，８７６号
公報や特開昭６２−１９８，８７７号公報には、特別な
塗工紙を使用することにより画像欠陥を改善する提案が
されている。しかしながら、これらの提案においては、
中間調領域での粒状性の改善や、発色性の向上について
の改善手段の提示はなされておらず、また、塗工紙であ
るために鉛筆での筆記性に劣り、コストも高く、しか
も、上質紙とは異なる風合があるという欠点があった。By the way, JP-A-62-198,876 and JP-A-62-198,877 propose a method of improving image defects by using a special coated paper. However, in these suggestions,
Improvement of graininess in the halftone region, and no improvement means have been presented for improving color development, and since it is a coated paper, it is inferior in writability with a pencil, and cost is high, and, It had the drawback that it had a different texture from that of high-quality paper.
【０００５】また、特開平１−２９２，３５４号公報に
は、記録後にカールを低減する方法が開示されている
が、上記と同様に塗工紙であるために、風合、鉛筆筆記
性、コスト等の点で問題があった。更に、特開平２−２
１７，８６２号公報、特開平３−２４３，９５３号公
報、特開平３−２３６，０６２号公報及び特開平３−１
８０，５９９号公報には、電子写真用上質紙のカールや
寸法安定性の改善に関する方法が開示されているが、何
れもフルカラー高画像面積記録の定着後カールに対して
は問題があり、その改善手段の提示はなされておらず、
また、フルカラー画像の粒状性、濃度むら、発色性等の
画質改善に対する改善手段の提示もされていない。Japanese Unexamined Patent Publication No. 1-292354 discloses a method of reducing curl after recording. However, since the coated paper is the same as the above, the texture, pencil writability, There was a problem in terms of cost. Furthermore, Japanese Patent Laid-Open No. 2-2
17,862, JP-A-3-243,953, JP-A-3-236,062, and JP-A3-1.
No. 80,599 discloses a method for curling high quality paper for electrophotography and improving dimensional stability, but all of them have problems with curling after fixing in full color high image area recording. No improvement measures have been presented,
Further, no improvement means for improving image quality such as graininess, density unevenness, and color developability of a full-color image is presented.
【０００６】[0006]
【発明が解決しようとする課題】本発明は、このような
従来の電子写真用転写紙が有している問題を克服したも
のであり、間接乾式電子写真方式のデジタルフルカラー
複写機やプリンターで記録された場合においても、中間
調領域の粒状性、高画像密度領域の濃度むら、発色性が
何れも良好で、なおかつ、トナーの定着性を損なうこと
がなく、高画像面積の記録を行う場合においても、定着
後カールが小さい電子写真用上質転写紙を提供すること
を目的とするものである。SUMMARY OF THE INVENTION The present invention overcomes the problems of such conventional electrophotographic transfer papers, and records in an indirect dry electrophotographic digital full-color copying machine or printer. In the case of performing recording of a high image area without sacrificing the toner fixing property, the graininess in the halftone area, the density unevenness in the high image density area, and the color developability are all good. Another object of the present invention is to provide a high-quality electrophotographic transfer paper having a small curl after fixing.
【０００７】[0007]
【課題を解決するための手段】本発明は、ＪＩＳ−Ｐ−
８１２４による坪量が７５〜９５ｇ／ｍ2 でＪＩＳ−Ｐ
−８１１９によるベック平滑度が表裏共に６５〜１２０
秒であり、かつ、ＪＩＳ−Ｐ−８１１８による密度が
０．８０ｇ／ｃｍ3 以上である上質紙において、温度２
０℃及び湿度６５％ＲＨから温度２０℃及び湿度２５％
ＲＨに変化したときのＣＤ（抄紙機の進行方向に対して
直角方向）の伸縮率が０．４５％以下であり、ＪＩＳ−
Ｐ−８１１８で前処理された用紙のＣＤの引張弾性率Ｅ
（ｋｇｆ／ｍｍ2 ）と紙の厚さｔ（ｍｍ）とがＥｔ3 ≧
０．２６（式１）の関係を満たすことを特徴とするもの
である。更に好ましい態様としては、ＪＩＳ−Ｐ−８１
２３によるハンター白色度が８２％以上であり、超音波
伝播法によるＭＤ（抄紙機の進行方向）とＣＤとの間の
繊維配向比が１．１０〜１．３０である電子写真用転写
紙である。The present invention is based on JIS-P-
JIS-P with basis weight of 75 to 95 g / m 2 according to 8124
Beck's smoothness according to -8119 is 65 to 120 on both sides.
Seconds and the density according to JIS-P-8118 is 0.80 g / cm 3 or more.
0 ° C and 65% humidity RH to 20 ° C and 25% humidity
The expansion and contraction rate of CD (direction perpendicular to the traveling direction of the paper machine) when changing to RH is 0.45% or less, and JIS-
Tensile modulus E of CD of paper pretreated with P-8118
(Kgf / mm 2 ) and paper thickness t (mm) are Et 3 ≧
It is characterized by satisfying the relationship of 0.26 (formula 1). In a further preferred embodiment, JIS-P-81
An electrophotographic transfer paper having a Hunter whiteness according to No. 23 of 82% or more and a fiber orientation ratio between MD (the traveling direction of the paper machine) and CD by the ultrasonic wave propagation method is 1.10 to 1.30. is there.
【０００８】本発明における「紙の伸縮率」とは、温度
２０℃、“湿度６５％Ｒ．Ｈ．→２５％Ｒ．Ｈ．→６５
％Ｒ．Ｈ．→９０％Ｒ．Ｈ．”で３サイクル吸脱湿処理
を繰り返し、最後に６５％Ｒ．Ｈ．→２５％Ｒ．Ｈ．と
変化させた時の寸法変化率を意味する。In the present invention, the "paper expansion / contraction rate" means that the temperature is 20 ° C., and the humidity is 65% RH → 25% RH → 65.
% R. H. → 90% R. H. Means the rate of dimensional change when the adsorption / dehumidification treatment is repeated for 3 cycles and finally changed from 65% RH to 25% RH.
【０００９】また、本発明において、超音波伝播法によ
るＭＤとＣＤとの繊維配向比は次式で示される値を意味
する。 超音波伝播法による繊維配向比＝ ＭＤの超音波伝播速
度／ＣＤの超音波伝播速度 また、本発明における上記超音波伝播法による繊維配向
比は、図１に示す測定方法によっても求めることができ
る。すなわち、厚さ１０ｍｍの気泡入りゴム板１上に試
料２を載置し、１５０ｍｍの間隔をおいて送波振動子３
と受波振動子４とを接触させ、送波部５から超音波パル
スの縦波を送り出し、これを受波部６で受け、この縦波
が送波振動子３を通過して試料２を通り受波振動子４を
通過するまでの時間を測定し、これを伝播速度に変換す
る。試料について、それぞれＭＤ及びＣＤ両方向の伝播
速度を測定し、その伝播速度比を求める。なお、図中、
符号７は演算素子であり、符号８は表示素子である。Further, in the present invention, the fiber orientation ratio of MD and CD by the ultrasonic wave propagation method means a value represented by the following equation. Fiber Orientation Ratio by Ultrasonic Propagation Method = Ultrasonic Propagation Velocity of MD / Ultrasonic Propagation Velocity of CD Further, the fiber orientation ratio by the above ultrasonic propagation method in the present invention can also be obtained by the measuring method shown in FIG. .. That is, the sample 2 is placed on the bubble-containing rubber plate 1 having a thickness of 10 mm, and the wave-transmitting vibrator 3 is placed at an interval of 150 mm.
And the wave receiving oscillator 4 are brought into contact with each other, a longitudinal wave of an ultrasonic pulse is transmitted from the wave transmitting unit 5, and the wave receiving unit 6 receives the longitudinal wave. The time required to pass through the wave receiving oscillator 4 is measured and converted into a propagation velocity. The propagation velocities in both the MD and CD directions of the sample are measured, and the propagation velocity ratio is determined. In the figure,
Reference numeral 7 is an arithmetic element, and reference numeral 8 is a display element.
【００１０】本発明においては、紙表面をベック平滑度
で表裏共に６５〜１２０秒に平滑化し、更に、密度を
０．８０ｇ／ｃｍ3 以上に高密度化するものであり、こ
れによって、熱加圧定着時に溶融したトナーが紙表面で
繊維に沿って流れ出したり、紙内部空隙に浸透する現象
を抑制することができる。この時、ベック平滑度が１２
０秒を越える処理を施しても、粒状性等の画質がそれ以
上改善されないばかりか、塗工紙のような風合が生じて
好ましくない。In the present invention, the paper surface is smoothed with Beck's smoothness to 65 to 120 seconds on both sides, and the density is further increased to 0.80 g / cm 3 or more. It is possible to suppress the phenomenon that the toner melted at the time of pressure fixing flows out along the fibers on the paper surface and permeates into the voids inside the paper. At this time, Beck's smoothness is 12
Even if the treatment for more than 0 seconds is performed, not only the image quality such as graininess is not further improved, but also the texture of coated paper is generated, which is not preferable.
【００１１】また、本発明で使用する紙はその秤量が７
５〜９５ｇ／ｍ2 である。７５ｇ／ｍ2 を下回る坪量の
紙に対して、ベック平滑度が６５秒以上で密度が０．８
０ｇ／ｃｍ3 以上となる処理を施すと、紙厚が薄くな
り、また、紙層内の空気層が少なくなるために、光の屈
折率が低下し画像の裏写りを生じたり、紙の腰が弱くな
るために走行不良を生じたり、トレイやソーターへの収
容性不良を生ずる。また、９５ｇ／ｍ2 を越える坪量で
は、紙の熱容量が大きくなるために、定着時にトナーを
十分溶融することができなくなり、定着性の不良やトナ
ー発色の低下を引き起こすことがある。The weight of the paper used in the present invention is 7
It is 5 to 95 g / m 2 . For papers with a basis weight of less than 75 g / m 2 , Beck smoothness of 65 seconds or more and density of 0.8
When the treatment is performed at 0 g / cm 3 or more, the paper thickness becomes thin, and the air layer in the paper layer becomes small, so that the refractive index of light decreases and the show-through of the image occurs, and the waist of the paper is reduced. As a result, the running becomes poor, and the accommodation of the tray or the sorter becomes poor. On the other hand, if the grammage exceeds 95 g / m 2 , the heat capacity of the paper becomes large, so that the toner cannot be sufficiently melted at the time of fixing, which may result in poor fixability and deterioration of toner color development.
【００１２】電子写真方式のフルカラー複写機やプリン
ターでは、一般に、黒、イエロー、マゼンタ及びシアン
からなる各色のトナーを紙上に転写し、定着工程で溶融
し、その後固化したトナーの減法混色により発色させて
いる。このため、トナーについては、溶融定着時に透明
性の高いものが使われ、紙上のカラー画像の発色性はそ
の紙の色の影響を受けやすい。そこで、色の濁りが少な
く、彩度の高い高発色画像を得るためには、この紙の色
についてのハンター白色度が８２％以上であることが好
ましく、これによってフルカラー発色の特に優れた記録
を得ることができる。In an electrophotographic full-color copying machine or printer, generally, toners of respective colors of black, yellow, magenta, and cyan are transferred onto paper, melted in a fixing step, and then developed by subtractive color mixing of solidified toners. ing. For this reason, a toner having high transparency is used at the time of fusing and fixing, and the color developability of a color image on paper is easily affected by the color of the paper. Therefore, in order to obtain a highly colored image with little color turbidity, it is preferable that the Hunter whiteness of the color of this paper is 82% or more. Obtainable.
【００１３】ところで、フルカラー画質を向上させるた
めに、坪量が７５〜９５ｇ／ｍ2 の電子写真用転写紙を
ベック平滑度で６５〜１２０秒とし、密度を０．８０ｇ
／ｃｍ3 以上と高密度処理すると、定着後のカールが極
端に大きくなるという現象が生じる。そこで、本発明者
らがこのカール発生のメカニズムについて検討した結
果、低画像密度時の定着後のカールは、熱加圧定着時の
紙の脱湿収縮によるカールが支配的であり、また、高画
像密度時の定着後カールは、トナー層と紙層とのバイメ
タルの様な構造により生じており、吸脱湿による伸縮の
小さいトナー層に対して紙層の吸脱湿による伸縮が大き
い時に生じる場合と、定着時に溶融したトナー層が室温
に冷却固化する際に収縮し、紙層に対して曲げ応力を与
え、カールを生じる場合とがあることを知見した。そし
て、前者に対しては、ＣＤの２０℃、６５％ＲＨから２
０℃、２５％ＲＨへの伸縮率を０．４５％以下とするこ
とで解決でき、また、後者に対しては、ＣＤの弾性率Ｅ
（ｋｇｆ／ｍｍ2 ）と紙の厚さｔ（ｍｍ）で示される紙
の曲げ剛度Ｅｔ3 を０．２６以上、好ましくは０．２８
以上とすることによって解決できることを見出した。従
って、本発明においては、ＣＤの伸縮率を０．４５％以
下とし、また、紙の曲げ剛度Ｅｔ3 を０．２６以上とす
ることが必要である。In order to improve the full-color image quality, the electrophotographic transfer paper having a basis weight of 75 to 95 g / m 2 has a Beck smoothness of 65 to 120 seconds and a density of 0.80 g.
When a high-density treatment of at least 3 / cm 3 occurs, a phenomenon in which the curl after fixing becomes extremely large occurs. Therefore, as a result of the present inventors' studying the mechanism of this curl generation, the curl after fixing at low image density is dominated by the dehumidification shrinkage of the paper at the time of heat and pressure fixing. Curling after fixing at the image density is caused by a bimetal-like structure of the toner layer and the paper layer, and occurs when the expansion and contraction of the paper layer is large compared to the expansion and contraction of the toner layer due to the small expansion and contraction of the toner layer by absorption and dehumidification It has been found that in some cases, the toner layer melted during fixing contracts when cooled and solidified at room temperature, giving a bending stress to the paper layer and causing curling. And for the former, it is 2 from CD at 20 ℃, 65% RH.
This can be solved by setting the expansion / contraction ratio to 0 ° C. and 25% RH to 0.45% or less. For the latter, the elastic modulus E of CD is
(Kgf / mm 2 ) and paper thickness t (mm), the bending stiffness Et 3 of the paper is 0.26 or more, preferably 0.28.
It was found that the above can solve the problem. Therefore, in the present invention, it is necessary that the expansion / contraction rate of the CD is 0.45% or less and the bending rigidity Et 3 of the paper is 0.26 or more.
【００１４】また、坪量７５〜９５ｇ／ｍ2 、ベック平
滑度で６５〜１２０秒、密度を０．８０ｇ／ｃｍ3 以上
の上質紙を使用し、上記ＣＤの伸縮率とＥｔ3 とを満た
すためには、好ましくは、ＣＤの繊維の配向を増加さ
せ、超音波伝播法によるＭＤとＣＤの繊維配向比を１．
１０〜１．３０にするのがよい。この超音波伝播法によ
るＭＤとＣＤの繊維配向比が１．１０を下回ると、ねじ
れカールが大きくなり好ましくない。Further, a high-quality paper having a basis weight of 75 to 95 g / m 2 , a Beck's smoothness of 65 to 120 seconds, and a density of 0.80 g / cm 3 or more is used, and the above CD expansion ratio and Et 3 are satisfied. In order to increase the fiber orientation of CD, the fiber orientation ratio of MD and CD by the ultrasonic wave propagation method is preferably 1.
It should be 10 to 1.30. If the fiber orientation ratio of MD and CD by this ultrasonic wave propagation method is less than 1.10, the twist curl becomes large, which is not preferable.
【００１５】以下、本発明で要求される条件を満足する
電子写真用転写紙について詳細に説明する。本発明の電
子写真用転写紙に使用するパルプは、ＬＢＫＰ（広葉樹
晒クラフトパルプ）、ＮＢＫＰ（針葉樹晒クラフトパル
プ）、ＬＢＳＰ（広葉樹晒亜硫酸パルプ）、ＮＢＳＰ
（針葉樹晒亜硫酸パルプ）等、従来から知られているケ
ミカルパルプの何れも使用できるが、ＣＤの伸縮率を小
さくし、かつ、Ｅｔ3 を大きくする観点から、ＬＢＫＰ
を全パルプ中８０％以上配合することが好ましい。ま
た、ＬＢＫＰ等の乾燥パルプを全パルプ中３０％以上配
合することにより、繊維間結合面積を減少させることが
可能であり、ＣＤの伸縮やＥｔ3 の観点から、更に望ま
しい。更に、このようなケミカルパルプには、綿パルプ
等の非木材パルプ、古紙パルプ、ＧＰ（グランドパル
プ）、ＴＭＰ（サーモメカニカルパルプ）等の高収率パ
ルプをハンター白色度が８２％を下回らない範囲で混合
してもよい。このハンター白色度を８２％以上にするた
めには、前記パルプを選択して使用してもよいが、パル
プの漂白工程を強化したパルプを利用したり、パルプス
ラリー中へ蛍光染料を混合してもよい。また、抄紙の前
にパルプスラリーの濾水度調整のため、調整工程で叩解
度の調整が行われる。叩解度は、高密度に処理した紙に
おいても、繊維間結合面積を低く抑え、ＣＤ伸縮量を小
さくするため、４００ｍｌＣ．Ｓ．Ｆ以上、好ましく
は、４５０ｍｌＣ．Ｓ．Ｆ以上となるように調整するの
がよい。The electrophotographic transfer paper satisfying the conditions required in the present invention will be described in detail below. The pulp used for the electrophotographic transfer paper of the present invention is LBKP (hardwood bleached kraft pulp), NBKP (softwood bleached kraft pulp), LBSP (hardwood bleached sulfite pulp), NBSP.
Although any of the conventionally known chemical pulps such as (softwood bleaching sulfite pulp) can be used, LBKP is used from the viewpoint of reducing the expansion and contraction rate of CD and increasing Et 3.
It is preferable to blend 80% or more of the total pulp. Further, by blending 30% or more of dry pulp such as LBKP in the total pulp, the interfiber bonding area can be reduced, which is more desirable from the viewpoint of expansion and contraction of CD and Et 3 . Further, as such chemical pulp, non-wood pulp such as cotton pulp, high-yield pulp such as used paper pulp, GP (ground pulp), TMP (thermo-mechanical pulp), etc., in a range where the Hunter whiteness does not fall below 82%. You may mix in. In order to increase the hunter whiteness to 82% or more, the above pulp may be selected and used. However, it is possible to use a pulp that is reinforced in the bleaching step of the pulp or to mix a fluorescent dye into the pulp slurry. Good. In addition, the beating degree is adjusted in the adjusting step in order to adjust the freeness of the pulp slurry before papermaking. The beating degree is 400 ml C.I. in order to suppress the interfiber bonding area and the CD expansion / contraction amount even in the case of high-density treated paper. S. F or more, preferably 450 ml C.I. S. It is better to adjust so that it is F or more.
【００１６】本発明の電子写真用転写紙には、不透明
度、白さ、表面平滑性等の調整のため、填料を使用す
る。使用できる填料としては、重質炭酸カルシウム、軽
質炭酸カルシウム、チョーク等の炭酸カルシウム、カオ
リン、焼成クレー、パイオロフィライト、セリサイト、
タルク等のケイ酸類や、二酸化チタン等の無機填料、及
び、尿素樹脂、スチレン等の有機顔料があるが、これら
に限られるものではない。電子写真方式における画質維
持性及び白色度向上の観点から炭酸カルシウムの配合が
好ましい。また、ベック平滑度が６５秒以上の高平滑処
理を助けるためや、紙層内部の繊維間結合をある程度切
断しＣＤ伸縮率を低下させるために、填料の配合量につ
いては、５〜１５重量％、好ましくは７〜１３重量％と
する。填料の配合量が５重量％を下回ると、カレンダー
処理等による平滑化処理がかかり難くなったり、填料に
よる光の屈折が低下し、不透明度が低下したり、ＣＤ伸
縮率が大きくなりすぎたり、更には、紙の腰が強くなり
すぎて走行性が低下するという弊害が生じる。また、こ
の填料の配合量が１５重量％を上回ると、紙粉の発生が
多くなり、複写機やプリンター内を汚染したり、紙の摩
擦係数が上がりすぎるために走行性が低下する。A filler is used in the electrophotographic transfer paper of the present invention in order to adjust opacity, whiteness, surface smoothness and the like. Fillers that can be used include heavy calcium carbonate, light calcium carbonate, calcium carbonate such as chalk, kaolin, calcined clay, pyrophyllite, sericite,
Examples thereof include, but are not limited to, silicic acids such as talc, inorganic fillers such as titanium dioxide, and organic pigments such as urea resin and styrene. From the viewpoint of maintaining image quality and improving whiteness in the electrophotographic system, it is preferable to add calcium carbonate. Further, in order to assist the high smoothing treatment with a Bekk smoothness of 65 seconds or more, or to cut the interfiber bond in the paper layer to some extent and reduce the CD expansion / contraction rate, the filler content is 5 to 15% by weight. , Preferably 7 to 13% by weight. When the content of the filler is less than 5% by weight, smoothing treatment such as calendering is less likely to occur, light refraction due to the filler is reduced, opacity is reduced, and CD stretch ratio is too large. Further, the stiffness of the paper becomes too strong, and the running property is deteriorated. On the other hand, if the content of the filler is more than 15% by weight, paper dust is often generated, which contaminates the inside of a copying machine or a printer, and the friction coefficient of the paper is excessively increased, so that the running property is deteriorated.
【００１７】本発明において使用する内添サイズ剤とし
ては、ロジン系サイズ剤、合成サイズ剤、石油樹脂系サ
イズ剤、中性サイズ剤等のサイズ剤が使用でき、硫酸バ
ンド、カチオン化澱粉等、適当なサイズ剤と繊維との定
着剤を組み合せて使用する。望ましくは、電子写真方式
の複写機、プリンター等における走行性及びコピー後の
用紙保存性の観点から、中性サイズ剤、特にアルケニル
無水コハク酸系サイズ剤を使用するのがよい。このほか
に、紙力増強剤、染料、ｐＨ調整剤等を添加してもかま
わない。As the internally added sizing agent used in the present invention, sizing agents such as rosin sizing agents, synthetic sizing agents, petroleum resin sizing agents and neutral sizing agents can be used, and sulfuric acid bands, cationized starch, etc. A suitable sizing agent and fiber fixing agent are used in combination. It is desirable to use a neutral sizing agent, particularly an alkenyl succinic anhydride-based sizing agent, from the viewpoints of running properties in electrophotographic copying machines, printers, and the like, and paper storability after copying. In addition to these, a paper strength enhancer, a dye, a pH adjuster and the like may be added.
【００１８】本発明の電子写真用転写紙の製造条件のコ
ントロールとしては、前述した紙料を用いて、坪量が７
５〜９５ｇ／ｍ2 となるように抄紙する。前述したよう
に坪量が７５ｇ／ｍ2 を下回ると、裏写りを生じたり、
走行性、収容性不良を生じ、９５ｇ／ｍ2 を上回ると、
定着不良や、トナーの発色性不良を生じる。また、ＣＤ
伸縮率を０．４５％以下にし、Ｅｔ3 を０．２６以上に
するためには、繊維配向比を制御することが好ましく、
超音波伝播法によるＭＤとＣＤの繊維配向比を１．１０
〜１．３０とするために、ＪＥＴ／ＷＩＲＥ比（原料噴
出速度／抄紙機ワイヤー速度比）を調整する方法が有効
である。これ以外にも、プレス時の紙のマシン方向の張
力及びドライヤー乾燥時のマシン方向の張力を小さくす
ることにより制御することもできる。更に、ベック平滑
度を６５〜１２０秒とし、密度を０．８０ｇ／ｃｍ3 以
上とするために、プレスを強化したり、マシンンカレン
ダーを強化するのがよい。また、スーパーカレンダーに
よる処理も可能であるが、これらに限られるものではな
い。As a control of the production conditions of the electrophotographic transfer paper of the present invention, the above-mentioned paper materials were used and the basis weight was 7
Paper is made so that the weight becomes 5 to 95 g / m 2 . As described above, when the basis weight is less than 75 g / m 2 , show-through may occur,
If running performance and storage capacity are poor, and if it exceeds 95 g / m 2 ,
Poor fixing and poor color development of toner occur. Also, CD
In order to make the expansion / contraction rate 0.45% or less and Et 3 0.26 or more, it is preferable to control the fiber orientation ratio,
The fiber orientation ratio of MD and CD by the ultrasonic wave propagation method is 1.10.
A method of adjusting the JET / WIRE ratio (raw material ejection speed / paper machine wire speed ratio) is effective in order to adjust the ratio to ˜1.30. In addition to this, the tension in the machine direction of the paper at the time of pressing and the tension in the machine direction at the time of drying the dryer can also be controlled to be small. Further, in order to set the Beck's smoothness to 65 to 120 seconds and the density to 0.80 g / cm 3 or more, it is preferable to strengthen the press or the machine calender. In addition, processing by a super calendar is possible, but not limited to these.
【００１９】また本発明では、電子写真方式における画
像の乱れを防止し、適当なコピー画像濃度を維持するた
め、塩化ナトリウム、塩化カリウム、スチレン−マレイ
ン酸コポリマー、第４級アンモニウム塩等の導電剤を抄
紙機のサイズプレスで表面塗布して、転写紙の表面電気
抵抗（ＪＩＳ−Ｋ−６９１１）を１０９〜１０１１Ωに
する。また、開封直後の製品水分は波打ちや、コピー後
カールの発生を抑えるために適正水分の４．０〜６．５
％になるよう抄紙機のドライヤー、キャレンダー工程
や、断裁工程等で調整する。また、保管時に吸脱湿が発
生しないように、ポリエチレンラミネート紙等の防湿包
装紙や、ポリプロピレンフィルム等で包装する。In the present invention, a conductive agent such as sodium chloride, potassium chloride, a styrene-maleic acid copolymer, a quaternary ammonium salt or the like is added in order to prevent image distortion in the electrophotographic system and maintain an appropriate copy image density. Is surface-coated with a size press of a paper machine, and the surface electric resistance (JIS-K-6911) of the transfer paper is set to 109 to 1011 Ω. The moisture content of the product immediately after opening is 4.0 to 6.5 which is an appropriate moisture content in order to suppress the occurrence of waviness and curling after copying.
Adjust the paper machine dryer, calender process, cutting process, etc. Also, in order to prevent moisture absorption and desorption during storage, it is wrapped with moisture-proof wrapping paper such as polyethylene laminated paper or polypropylene film.
【００２０】[0020]
【実施例】以下、実施例及び比較例に基づいて本発明を
より具体的に説明するが、本発明はこれにより限定され
るものではない。EXAMPLES The present invention will be described in more detail based on the following examples and comparative examples, but the present invention is not limited thereto.
【００２１】実施例１ 酸素晒等で多段漂白し高白色化したＬＢＫＰをろ水度４
７０ｍｌＣ．Ｓ．Ｆ．まで叩解したパルプを原料とし、
軽質炭酸カルシウム（ＴＰ１２１：奥多摩工業社製）を
１０重量％となるよう添加し、内添サイズ剤としてアル
ケニル無水コハク酸（ファイブラン８１：王子ナショナ
ル社製）を対パルプ当り０．０８重量％配合し、カチオ
ン化澱粉（Ｃａｔｅ１５：王子ナショナル社製）を対パ
ルプ当り０．５重量％配合した。この紙料に抄紙後のハ
ンター白色度が８４％となるように少量の蛍光染料を配
合し、坪量７５ｇ／ｍ2 で、かつ、超音波伝播法による
繊維配向比が１．２０前後となるように、Ｊｅｔ／Ｗｉ
ｒｅ比とＷｉｒｅ速度とを調整して長網多筒式抄紙機で
抄紙し、抄紙後水分が５重量％となるようにドライヤー
条件を調整した。また、サイズプレス工程で酸化でんぷ
んを０．９ｇ／ｍ2、ＮａＣｌを０．１ｇ／ｍ2 塗工し
た。更に、プレス工程、及び、マシンカレンダーを強化
して平滑性及び密度を高くした。この電子写真用転写紙
の各特性は、表１に示すように、坪量７５ｇ／ｍ2 、密
度０．８２ｇ／ｃｍ3 、ＦＳ（フェルトサイド）の平滑
度８５秒、ＷＳ（ワイヤーサイド）の平滑度７２秒、超
音波伝播法による繊維配向比１．１８、ＣＤ伸縮率０．
３２、Ｅｔ3 ０．２６、ハンター白色度８４％であっ
た。この電子写真用紙をデジタルフルカラー複写機Ａ
ｃｏｌｏｒ ６３０（富士ゼロックス社製）を用いて、
Ｂｌａｃｋ、Ｙｅｌｌｏｗ、Ｍａｇｅｎｔａ、Ｃｙａ
ｎ、Ｒｅｄ、Ｇｒｅｅｎ、Ｂｌｕｅ、及び、Ｙｅｌｌｏ
ｗ、Ｍａｇｅｎｔａ、Ｃｙａｎの混色Ｂｌａｃｋの、各
画像面積率１０、２０、３０、４０、５０、６０、７
０、８０、９０、１００％の２ｃｍ×２ｃｍのパッチを
平滑度の低い用紙面に転写、定着し、中間調領域の粒状
性としては、各色の画像面積率２０、３０、４０％のパ
ッチを目視で評価した。高画像密度領域の濃度むらは、
各色の画像面積率７０、８０、９０、１００％のパッチ
を目視で評価した。また、発色性の良否を各色の画像面
積率１０〜１００％のパッチを目視で評価した。また、
この画像の裏写りの評価を目視で行った。トナーの定着
度は、Ｙｅｌｌｏｗ、Ｍａｇｅｎｔａ、Ｃｙａｎの混色
Ｂｌａｃｋの画像面積率１００％のパッチを中央から画
像が内側になるよう折り曲げ、その折り曲げ部に２ｋｇ
のロールを転がした後、画像面を開き、軽く布でふきと
った時の折り曲げ部のトナーの剥離程度を目視により評
価した。定着後のカールの評価は、Ｍａｇｅｎｔａトナ
ー、Ｃｙａｎトナーの２色からなるＢｌｕｅのベタ画像
を用紙全面に記録し、定着５分後のカールの大きさを評
価した。この時の実験環境は、２２℃ ５５％Ｒ．Ｈ．
とした。その他、得られた電子写真用紙の普通紙感等の
風合は、男性１５名、女性１５名のパネラーにより官能
評価して問題点を抽出した。以上の結果、表１に示すよ
うに、特に粒状性、濃度むら、トナー定着性に優れた転
写紙が得られた。なお、これらデジタルフルカラー複写
機での画質、トナー定着性、カールの評価尺度を次に示
す。 〔中間調領域粒状性〕 ○：問題とならない □：わずかにざらつき感があるが許容できる △：ざらつき感が少しある ×：ざらつき感がめだつ 〔高画像密度領域の濃度むら〕 ○：問題とならない □：わずかに濃度むらがあるが許容できる △：濃度むらが少しある ×：濃度むらがめだつ 〔発色性〕 ○：濁りのない鮮やかな発色 □：わずかに濁りがあるが許容できる △：濁りが少しある ×：暗く濁りがある 〔トナーの定着度〕 ○：トナーがほとんど剥離しない □：わずかに剥離するが許容できる △：かなり剥離する ×：剥離領域が大きい 〔定着後カール〕 ○：ほとんどカールしない □：少しカールするが許容できる △：かなりカールする ×：カールが大きく場合によっては、円筒となるExample 1 LBKP that had been whitened by multi-stage bleaching by oxygen exposure etc. had a freeness of 4
70 ml C.I. S. F. Made from pulp that has been beaten to
Light calcium carbonate (TP121: Okutama Kogyo Co., Ltd.) was added to 10% by weight, and 0.08% by weight of alkenyl succinic anhydride (Fibran 81: Oji National Co., Ltd.) was added to the pulp as an internally added sizing agent. Then, 0.5 wt% of cationized starch (Cate15: manufactured by Oji National Co., Ltd.) was mixed with the pulp. A small amount of a fluorescent dye is added to this stock so that the Hunter whiteness after papermaking is 84%, the basis weight is 75 g / m 2 , and the fiber orientation ratio by the ultrasonic wave propagation method is about 1.20. Like Jet / Wi
The re ratio and the wire speed were adjusted and papermaking was performed with a fourdrinier cylinder paper machine, and the dryer conditions were adjusted so that the water content after papermaking was 5% by weight. Further, the oxidized starch 0.9 g / m 2, NaCl in a size press process was 0.1 g / m 2 coating. Further, the press process and machine calender were strengthened to enhance smoothness and density. The characteristics of this electrophotographic transfer paper are, as shown in Table 1, a basis weight of 75 g / m 2 , a density of 0.82 g / cm 3 , an FS (felt side) smoothness of 85 seconds, and a WS (wire side). Smoothness 72 seconds, fiber orientation ratio by ultrasonic wave propagation method 1.18, CD expansion ratio 0.
32, Et 3 0.26, Hunter whiteness 84%. This electrophotographic paper is a digital full color copier A
Using color 630 (manufactured by Fuji Xerox Co., Ltd.)
Black, Yellow, Magenta, Cya
n, Red, Green, Blue, and Yellow
Image area ratio 10, 20, 30, 40, 50, 60, 7 of the mixed color Black of w, Magenta and Cyan
A 0, 80, 90, 100% 2 cm x 2 cm patch was transferred and fixed on a paper surface with low smoothness, and as the graininess of the halftone area, a patch with an image area ratio of 20, 30, 40% for each color was used. It was evaluated visually. The density unevenness in the high image density area is
The patches having image area ratios of 70, 80, 90, and 100% of the respective colors were visually evaluated. In addition, the quality of color development was visually evaluated for patches with an image area ratio of 10 to 100% for each color. Also,
The show-through of this image was evaluated visually. Toner's degree of fixing is such that a patch of yellow, magenta, cyan mixed color black with an image area ratio of 100% is bent so that the image is inward from the center, and 2 kg is applied to the bent part.
After rolling the roll, the image surface was opened, and the degree of toner peeling at the bent portion when lightly wiped with a cloth was visually evaluated. To evaluate the curl after fixing, a blue solid image composed of two colors of magenta toner and Cyan toner was recorded on the entire surface of the paper, and the curl size after 5 minutes of fixing was evaluated. The experimental environment at this time was 22 ° C. 55% R.S. H.
And In addition, the texture of the obtained electrophotographic paper, such as the feeling of plain paper, was subjected to sensory evaluation by panelists of 15 males and 15 females to extract problems. As a result, as shown in Table 1, a transfer paper having excellent graininess, uneven density, and toner fixing property was obtained. The evaluation criteria for image quality, toner fixability, and curl in these digital full-color copying machines are shown below. [Granularity in halftone area] ∘: No problem □: Slightly grainy but acceptable △: Slightly grainy ×: Grainy [medium density unevenness in high image density area] ○: No problem □: There is slight unevenness in density, but it is acceptable. △: There is slight unevenness in density. ×: There is uneven density. [Color development] ○: Vivid color without turbidity. □: Slightly turbidity is allowed. There is a little X: Dark and turbid [Fixing degree of toner] ○: Toner hardly peels □: Slight peeling, but acceptable Δ: Peeling considerably ×: Large peeling area [Curl after fixing] ○: Almost curl No □: Slightly curled, but acceptable △: Significantly curled ×: Larger curl
【００２２】実施例２、３、４ 実施例１と同様の紙料を用いて、マシンカレンダーを実
施例１より若干弱くかけて、密度を０．８０ｇ／ｃｍ3
とし、その他の抄紙条件は、実施例１と同様にして実施
例２の転写紙を得た。実施例１と同様の紙料を用いて、
実施例２の抄紙条件のうち、Ｊｅｔ／Ｗｉｒｅ比を変更
し、超音波伝播法による繊維配向比が１．１６になるよ
う調整し、実施例３の転写紙を得た。また、同様に実施
例２に対し、超音波伝播法による繊維配向比が１．３０
となるよう調整し、実施例４の転写紙を得た。実施例
２、３、４の転写紙の坪量、密度、平滑度、超音波伝播
法による繊維配向比、ＣＤ伸縮率、Ｅｔ3 、ハンター白
色度は、表１に示す値となった。これらの転写紙を実施
例１と同様の方法により、画質、トナー定着性、定着後
カール、風合等を評価した結果を表１に示す。実施例
２、３は、特に定着後カールにすぐれた転写紙が得られ
た。実施例４では、実用上満足できる転写紙が得られ
た。Examples 2, 3, 4 Using the same paper material as in Example 1, a machine calender was applied slightly weaker than in Example 1 to give a density of 0.80 g / cm 3.
The transfer paper of Example 2 was obtained in the same manner as in Example 1 except for the above. Using the same stock as in Example 1,
Among the papermaking conditions of Example 2, the Jet / Wire ratio was changed and the fiber orientation ratio by the ultrasonic wave propagation method was adjusted to be 1.16 to obtain the transfer paper of Example 3. Similarly to Example 2, the fiber orientation ratio by the ultrasonic wave propagation method is 1.30.
The transfer paper of Example 4 was obtained. The grammage, density, smoothness, fiber orientation ratio by ultrasonic wave propagation method, CD expansion / contraction ratio, Et 3 , and Hunter whiteness of the transfer papers of Examples 2, 3, and 4 were the values shown in Table 1. Table 1 shows the results of evaluating the image quality, toner fixability, curl after fixing, and texture of these transfer papers by the same method as in Example 1. In Examples 2 and 3, transfer papers having excellent curl after fixing were obtained. In Example 4, a transfer paper that was practically satisfactory was obtained.
【００２３】実施例５、６、７、８ 実施例１と同様の紙料を用いて、坪量を８１ｇ／ｍ2 に
した以外は、実施例１と同様の抄紙条件で、実施例５の
転写紙を得た。また、実施例５に使用したパルプ原料を
変更し、乾燥パルプを３０％含むＬＢＫＰを使用した他
は、実施例５と同様の紙料、同様の抄紙条件で実施例６
の転写紙を得た。実施例７の転写紙は、実施例５と同様
の紙料を用い、マシンカレンダーを実施例５より強くか
けて、密度を０．８５ｇ／ｃｍ3 とし、その他の抄紙条
件は、実施例５と同様にして得た。この時の平滑度は、
ＦＳで１２０秒であった。実施例８の転写紙は、実施例
５と同様の紙料を用いて、超音波伝播法による繊維配向
比が１．３０となるよう調整したほかは、実施例５と同
様の抄紙条件により得た。実施例５、６、７、８の転写
紙の坪量、密度、平滑度、超音波伝播法による繊維配向
比、ＣＤ伸縮率、Ｅｔ3 、ハンター白色度は、表２に示
す値となった。これらの転写紙を実施例１と同様の方法
により、画質、トナー定着性、定着後カール、風合等を
評価した結果を表２に示す。実施例５は、画質、トナー
定着性、定着後カール全てに優れた転写紙が得られた。
実施例６は、実施例５よりもＣＤ伸縮率が更に小さく定
着後カールにより一層すぐれる転写紙が得られた。実施
例７は、高平滑なため少し普通紙らしくない風合を与え
るが、許容範囲内であり、画質、トナー定着性、定着後
カールに優れた転写紙が得られた。実施例８は、特に画
質、トナー定着性に優れた転写紙が得られた。Examples 5, 6, 7 and 8 The same papermaking conditions as in Example 1 were used except that the same paper material as in Example 1 was used and the basis weight was 81 g / m 2 . A transfer paper was obtained. Further, the pulp raw material used in Example 5 was changed, and LBKP containing 30% of dry pulp was used, and the same stock material and the same papermaking conditions as in Example 5 were used.
The transfer paper of was obtained. The transfer paper of Example 7 uses the same stock material as in Example 5, and applies a machine calendar more strongly than in Example 5 to give a density of 0.85 g / cm 3, and other papermaking conditions are the same as those in Example 5. Obtained in the same way. The smoothness at this time is
It was 120 seconds by FS. The transfer paper of Example 8 was obtained under the same papermaking conditions as in Example 5, except that the same paper material as in Example 5 was used and the fiber orientation ratio by the ultrasonic wave propagation method was adjusted to 1.30. It was The basis weight, density, smoothness, fiber orientation ratio by the ultrasonic wave propagation method, CD expansion / contraction ratio, Et 3 , and Hunter whiteness of the transfer papers of Examples 5, 6, 7, and 8 were the values shown in Table 2. .. Table 2 shows the results of evaluating the image quality, toner fixability, curl after fixing, and texture of these transfer papers by the same method as in Example 1. In Example 5, a transfer paper excellent in image quality, toner fixing property, and curl after fixing was obtained.
In Example 6, a transfer paper having a smaller CD expansion and contraction rate than that of Example 5 and being more excellent in curling after fixing was obtained. In Example 7, a transfer paper having a high smoothness and giving a feeling not like plain paper was obtained, but within a permissible range, a transfer paper excellent in image quality, toner fixing property, and curl after fixing was obtained. In Example 8, a transfer paper having excellent image quality and toner fixing property was obtained.
【００２４】実施例９、１０、１１ 実施例１と同様の紙料を用いて、坪量を９０ｇ／ｍ2 に
した以外は、実施例１と同様の抄紙条件で、実施例９の
転写紙を得た。また、実施例１と同様の紙料を用いて、
坪量を９５ｇ／ｍ2 にした以外は、実施例１と同様の抄
紙条件で、実施例１０の転写紙を得た。実施例１１の転
写紙は、実施例１０と同様の紙料を用いて、超音波伝播
法による繊維配向比が１．３０となるよう調整したほか
は、実施例１０と同様の抄紙条件により得た。実施例
９、１０、１１の転写紙の坪量、密度、平滑度、超音波
伝播法による繊維配向比、ＣＤ伸縮率、Ｅｔ3 、ハンタ
ー白色度は、表３に示す値となった。これらの転写紙を
実施例１と同様の方法により、画質、トナー定着性、定
着後カール、風合等を評価した結果を表３に示す。実施
例９は、画質、トナー定着性、定着後カール全てに優れ
た転写紙が得られた。実施例１０は、特に画質、定着後
カールに優れた転写紙が得られた。実施例１１は、特に
中間調領域の粒状性、高画像密度領域の濃度むらに優れ
た転写紙が得られた。Examples 9, 10 and 11 The transfer paper of Example 9 was used under the same papermaking conditions as in Example 1 except that the same paper material as in Example 1 was used and the basis weight was 90 g / m 2. Got Also, using the same paper material as in Example 1,
A transfer paper of Example 10 was obtained under the same papermaking conditions as in Example 1 except that the basis weight was changed to 95 g / m 2 . The transfer paper of Example 11 was obtained under the same papermaking conditions as in Example 10 except that the same paper material as in Example 10 was used and the fiber orientation ratio by the ultrasonic wave propagation method was adjusted to 1.30. It was The basis weight, density, smoothness, fiber orientation ratio by the ultrasonic wave propagation method, CD expansion / contraction ratio, Et 3 , and Hunter whiteness of the transfer papers of Examples 9, 10, and 11 were the values shown in Table 3. Table 3 shows the results of evaluating the image quality, toner fixability, curl after fixing, and texture of these transfer papers by the same method as in Example 1. In Example 9, a transfer paper excellent in image quality, toner fixability, and curl after fixing was obtained. In Example 10, a transfer paper having excellent image quality and curling after fixing was obtained. In Example 11, the transfer paper excellent in the graininess in the halftone region and the uneven density in the high image density region was obtained.
【００２５】実施例１２ 実施例５の紙料から、蛍光染料を除去し、実施例５と同
様の抄紙条件で、実施例１２の転写紙を得た。ハンター
白色度は、８２％であった。本転写紙の坪量、密度、平
滑度、超音波伝播法による繊維配向比、ＣＤ伸縮率、Ｅ
ｔ3 は、表３に示す値となった。本転写紙を実施例１と
同様の方法により、画質、トナー定着性、定着後カー
ル、風合等を評価した結果を表３に示す。実施例１２
は、わずかに濁った発色を示すが許容レベルであり、そ
の他画質、トナー定着性、定着後カール共に優れた転写
紙が得られた。Example 12 The fluorescent dye was removed from the paper material of Example 5 and the transfer paper of Example 12 was obtained under the same papermaking conditions as in Example 5. Hunter whiteness was 82%. Basis weight, density, smoothness, fiber orientation ratio by ultrasonic wave propagation method, CD expansion ratio, E of this transfer paper
t 3 has the value shown in Table 3. Table 3 shows the results of evaluating the image quality, toner fixability, curl after fixing, and texture of this transfer paper by the same method as in Example 1. Example 12
Shows a slightly cloudy color development but is at an acceptable level, and a transfer paper excellent in image quality, toner fixing property, and curl after fixing was obtained.
【００２６】比較例１、２ 坪量を７０ｇ／ｍ2 とした以外は、実施例１と同様の紙
料、抄紙方法により比較例１の転写紙を得た。同様に坪
量を１００ｇ／ｍ2 とした以外は、実施例１と同様の紙
料、抄紙方法により比較例２の転写紙を得た。これらの
転写紙の密度、平滑度、超音波伝播法による繊維配向
比、ＣＤ伸縮率、Ｅｔ3 、ハンター白色度は、表４に示
す値となった。これらの転写紙の坪量の影響を確認する
ために実施例１と同様の方法により、画質、トナー定着
性、定着後カール、風合等を評価した結果を表４に示
す。比較例１は、カールが非常に大きくなり、比較例２
の転写紙は、トナーの定着が悪く発色も濁ったものとな
った。何れの転写紙も実用に供さないものであった。Comparative Examples 1 and 2 The transfer paper of Comparative Example 1 was obtained by the same paper material and the same papermaking method as in Example 1 except that the basis weight was 70 g / m 2 . Similarly, a transfer paper of Comparative Example 2 was obtained by the same paper material and the same papermaking method as in Example 1 except that the basis weight was 100 g / m 2 . The density, smoothness, fiber orientation ratio by the ultrasonic wave propagation method, CD expansion / contraction ratio, Et 3 , and Hunter whiteness of these transfer papers are the values shown in Table 4. Table 4 shows the results of evaluation of image quality, toner fixability, curl after fixing, and texture in the same manner as in Example 1 in order to confirm the influence of the basis weight of the transfer paper. In Comparative Example 1, the curl becomes very large, and Comparative Example 2
In the transfer paper of No. 3, the fixing of the toner was poor and the color development became cloudy. None of the transfer papers was put to practical use.
【００２７】比較例３、４、５ 密度を０．７８ｇ／ｃｍ3 とした以外は、実施例５と同
様の紙料、抄紙方法により比較例３の転写紙を得た。こ
の転写紙の平滑度は、平滑度の低い面で、５９秒であっ
た。比較例３に対し密度を０．７６ｇ／ｃｍ3 と更に低
くした以外は同様の方法で比較例４を得た。密度を０．
９０ｇ／ｃｍ3 とした以外は、実施例５と同様の紙料、
抄紙方法により比較例５の転写紙を得た。この転写紙の
平滑度は、平滑度の高い面で、２０７秒であった。これ
らの転写紙の坪量、密度、平滑度、超音波伝播法による
繊維配向比、ＣＤ伸縮率、Ｅｔ3 、ハンター白色度は、
表４又は表５に示す値となった。これらの転写紙の平滑
度、密度の影響を確認するために実施例１と同様の方法
により、画質、トナー定着性、定着後カール、風合等を
評価した結果を表４又は表５に示す。比較例３は中間調
領域のざらつきが悪く、高画像密度領域の濃度むらも発
生した。比較例４は更に中間調領域のざらつきが悪く、
高画像密度領域の濃度むらも更に顕著となった。比較例
５の転写紙は高平滑となり過ぎたために普通紙の風合を
失い、鉛筆での筆記性も十分ではなく、Ｅｔ3 も小さい
値となったため、大きなカールを生じた。何れの転写紙
も実用に供さないものであった。Comparative Examples 3, 4 and 5 The transfer paper of Comparative Example 3 was obtained by the same paper material and the same papermaking method as in Example 5, except that the density was 0.78 g / cm 3 . The smoothness of this transfer paper was 59 seconds on the low smoothness side. Comparative Example 4 was obtained in the same manner as Comparative Example 3, except that the density was further lowered to 0.76 g / cm 3 . Set the density to 0.
The same paper material as in Example 5 except that the amount was 90 g / cm 3 .
The transfer paper of Comparative Example 5 was obtained by the papermaking method. The smoothness of this transfer paper was 207 seconds in terms of high smoothness. The basis weight, density, smoothness, fiber orientation ratio by ultrasonic wave propagation method, CD expansion ratio, Et 3 , and Hunter whiteness of these transfer papers are as follows.
The values shown in Table 4 or Table 5 were obtained. Table 4 or Table 5 shows the results of evaluation of image quality, toner fixability, curl after fixing, touch, etc. by the same method as in Example 1 in order to confirm the influence of the smoothness and density of these transfer papers. .. In Comparative Example 3, roughness in the halftone region was poor, and density unevenness in the high image density region also occurred. In Comparative Example 4, the roughness in the halftone region is even worse,
The density unevenness in the high image density area became more remarkable. Since the transfer paper of Comparative Example 5 became too smooth, the texture of plain paper was lost, the writability with a pencil was not sufficient, and the Et 3 was a small value, resulting in a large curl. None of the transfer papers was put to practical use.
【００２８】比較例６、７、８ 実施例３と同様の紙料を用いて、超音波伝播法による繊
維配向比が１．３５となるよう調整したほかは、実施例
３と同様の抄紙条件により比較例６の転写紙を得た。こ
の転写紙のＣＤ伸縮率は、０．４６％であった。また、
実施例５と同様の紙料を用いて、超音波伝播法による繊
維配向比が１．３５となるよう調整したほかは、実施例
５と同様の抄紙条件により比較例７の転写紙を得た。こ
の転写紙のＣＤ伸縮率は、０．４９％であった。更に、
実施例１０と同様の紙料を用いて、超音波伝播法による
繊維配向比が１．４５となるよう調整したほかは、実施
例１０と同様の抄紙条件により比較例８の転写紙を得
た。この転写紙のＣＤ伸縮率は、０．５５％であった。
これらの転写紙の坪量、密度、平滑度、超音波伝播法に
よる繊維配向比、ＣＤ伸縮率、Ｅｔ3 、ハンター白色度
は、表５に示す値となった。これらの転写紙の主にＣＤ
伸縮率の影響を確認するために実施例１と同様の方法に
より、画質、トナー定着性、定着後カール、風合等を評
価した結果を表５に示す。比較例６はＣＤ伸縮率が大き
くＥｔ3 も小さい値となったため、大きなカールを発生
した。比較例７の転写紙はＣＤ伸縮率が比較例５よりも
大きいため、非常に大きなカールを生じた。比較例８の
転写紙はＣＤ伸縮率が大きいため、非常に大きなカール
を生じた。何れの転写紙も実用に供さないものであっ
た。Comparative Examples 6, 7 and 8 The same papermaking conditions as in Example 3 except that the same paper material as in Example 3 was used to adjust the fiber orientation ratio by the ultrasonic wave propagation method to 1.35. Thus, a transfer paper of Comparative Example 6 was obtained. The CD expansion and contraction rate of this transfer paper was 0.46%. Also,
A transfer paper of Comparative Example 7 was obtained under the same papermaking conditions as in Example 5, except that the same fiber material as in Example 5 was used to adjust the fiber orientation ratio by the ultrasonic wave propagation method to 1.35. .. The CD expansion and contraction rate of this transfer paper was 0.49%. Furthermore,
The transfer paper of Comparative Example 8 was obtained under the same papermaking conditions as in Example 10, except that the fiber orientation ratio by the ultrasonic wave propagation method was adjusted to 1.45 using the same stock material as in Example 10. .. The CD expansion and contraction rate of this transfer paper was 0.55%.
The basis weight, density, smoothness, fiber orientation ratio by the ultrasonic wave propagation method, CD expansion / contraction ratio, Et 3 , and Hunter whiteness of these transfer papers are the values shown in Table 5. CD of these transfer papers
Table 5 shows the results of evaluation of image quality, toner fixability, curl after fixing, and texture by the same method as in Example 1 in order to confirm the influence of the expansion / contraction ratio. In Comparative Example 6, the CD expansion and contraction rate was large and Et 3 was also a small value, so that a large curl occurred. Since the transfer paper of Comparative Example 7 has a higher CD expansion / contraction ratio than that of Comparative Example 5, a very large curl occurred. The transfer paper of Comparative Example 8 had a large CD expansion and contraction ratio, and thus a very large curl was generated. None of the transfer papers was put to practical use.
【００２９】比較例９、１０ 実施例７と同様の紙料を用いて、超音波伝播法による繊
維配向比が１．２８となるよう調整したほかは、実施例
７と同様の抄紙条件により比較例９の転写紙を得た。こ
の転写紙のＥｔ3 は、０．２４であった。また、実施例
１と同様の紙料を用いて、超音波伝播法による繊維配向
比が１．３０となるよう調整したほかは、実施例１と同
様の抄紙条件により比較例１０の転写紙を得た。この転
写紙のＥｔ3 は、０．２２であった。これらの転写紙の
坪量、密度、平滑度、超音波伝播法による繊維配向比、
ＣＤ伸縮率、Ｅｔ3 、ハンター白色度は、表６に示す値
となった。これらの転写紙の主にＥｔ3 の影響を確認す
るために実施例１と同様の方法により、画質、トナー定
着性、定着後カール、風合等を評価した結果を表６に示
す。比較例９は、Ｅｔ3 も小さい値となったため、大き
なカールを発生した。比較例１０の転写紙は、Ｅｔ3 が
比較例９よりも更に小さいため、非常に大きなカールを
生じた。何れの転写紙も実用に供さないものであった。Comparative Examples 9 and 10 Comparison was made under the same papermaking conditions as in Example 7, except that the same paper material as in Example 7 was used and the fiber orientation ratio by the ultrasonic wave propagation method was adjusted to 1.28. The transfer paper of Example 9 was obtained. The Et 3 of this transfer paper was 0.24. The transfer paper of Comparative Example 10 was prepared under the same papermaking conditions as in Example 1, except that the same paper material as in Example 1 was used to adjust the fiber orientation ratio by the ultrasonic wave propagation method to 1.30. Obtained. The Et 3 of this transfer paper was 0.22. Basis weight, density, smoothness of these transfer papers, fiber orientation ratio by ultrasonic wave propagation method,
The CD expansion / contraction rate, Et 3 , and Hunter whiteness were the values shown in Table 6. Table 6 shows the results of evaluation of image quality, toner fixability, curl after fixing, touch, etc. by the same method as in Example 1 in order to confirm the influence of Et 3 mainly on these transfer papers. In Comparative Example 9, since Et 3 was also a small value, a large curl occurred. The transfer paper of Comparative Example 10 had a much larger curl because Et 3 was smaller than that of Comparative Example 9. None of the transfer papers was put to practical use.
【００３０】比較例１１ 漂白程度を落としたＬＢＫＰを使用した以外は、実施例
５と同様の紙料、抄紙方法により比較例１１の転写紙を
得た。本転写紙の密度、平滑度、超音波伝播法による繊
維配向比、ＣＤ伸縮率、Ｅｔ3 、ハンター白色度は、表
６に示す値となった。本転写紙のハンター白色度の影響
を確認するために実施例１と同様の方法により、画質、
トナー定着性、定着後カール、風合等を評価した結果を
表６に示す。比較例１１は、発色が濁ったものとなり実
用に供さないものであった。Comparative Example 11 A transfer paper of Comparative Example 11 was obtained by using the same paper material and the same papermaking method as in Example 5 except that LBKP whose bleaching degree was reduced was used. The density, smoothness, fiber orientation ratio by the ultrasonic wave propagation method, CD expansion / contraction ratio, Et 3 , and Hunter whiteness of this transfer paper are the values shown in Table 6. In order to confirm the influence of the Hunter whiteness of the transfer paper, the image quality,
Table 6 shows the results of evaluation of toner fixability, curl after fixing, texture and the like. In Comparative Example 11, the color development became cloudy and was not put to practical use.
【００３１】比較例１２ 坪量が７８ｇ／ｍ2 の市販の電子写真用転写紙を実施例
１と同様の方法により、画質、トナー定着性、定着後カ
ール、風合等を評価した。本転写紙の坪量、密度、平滑
度、超音波伝播法による繊維配向比、ＣＤ伸縮率、Ｅｔ
3 、ハンター白色度は、表６に示す値であった。比較例
１２は、表６に示したように画質、定着後カール共に悪
く、実用に供さないものであった。Comparative Example 12 A commercially available electrophotographic transfer paper having a basis weight of 78 g / m 2 was evaluated in the same manner as in Example 1 for image quality, toner fixability, curl after fixing, texture and the like. Basis weight, density, smoothness, fiber orientation ratio by ultrasonic wave propagation method, CD expansion ratio, Et of this transfer paper
3 and Hunter whiteness were the values shown in Table 6. In Comparative Example 12, as shown in Table 6, the image quality and the curl after fixing were poor, and were not put to practical use.
【００３２】[0032]
【表１】[Table 1]
【００３３】[0033]
【表２】[Table 2]
【００３４】[0034]
【表３】[Table 3]
【００３５】[0035]
【表４】[Table 4]
【００３６】[0036]
【表５】[Table 5]
【００３７】[0037]
【表６】[Table 6]
【００３８】[0038]
【発明の効果】本発明は、上記のような構成、特徴を持
ってなるため、間接電子写真方式のフルカラー及びモノ
クローム記録における中間調領域の粒状性に優れ、高画
像密度領域の濃度むらの発生もなく、更に、フルカラー
画像の発色性にも優れ、トナーの定着性も良好な画像を
提供でき、フルカラー高画像面積記録の定着後カールも
小さい電子写真用転写紙を提供できるものである。Since the present invention has the constitution and characteristics as described above, it is excellent in the graininess of the halftone region in full color and monochrome recording of the indirect electrophotographic system and the occurrence of density unevenness in the high image density region. Furthermore, it is possible to provide an electrophotographic transfer paper which is excellent in color developability of a full-color image, can provide an image having good toner fixability, and has a small curl after fixing in full-color high image area recording.
【図１】 図１は超音波伝搬速度測定法を示すブロック
図である。FIG. 1 is a block diagram showing an ultrasonic propagation velocity measuring method.
１…気泡入りゴム板、２…試験試料、３…送波振動子、
４…受波振動子、５…送波部、６…受波部、７…演算素
子、８…表示素子1 ... Bubbled rubber plate, 2 ... Test sample, 3 ... Wave oscillator,
4 ... Wave receiving oscillator, 5 ... Wave transmitting unit, 6 ... Wave receiving unit, 7 ... Arithmetic element, 8 ... Display element
─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成５年３月１８日[Submission date] March 18, 1993
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００３２[Name of item to be corrected] 0032
【補正方法】追加[Correction method] Added
【補正内容】[Correction content]
【００３２】[0032]
【表１】 [Table 1]
【手続補正２】[Procedure Amendment 2]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００３３[Correction target item name] 0033
【補正方法】追加[Correction method] Added
【補正内容】[Correction content]
【００３３】[0033]
【表２】 [Table 2]
【手続補正３】[Procedure amendment 3]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００３４[Correction target item name] 0034
【補正方法】追加[Correction method] Added
【補正内容】[Correction content]
【００３４】[0034]
【表３】 [Table 3]
【手続補正４】[Procedure correction 4]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００３５[Name of item to be corrected] 0035
【補正方法】追加[Correction method] Added
【補正内容】[Correction content]
【００３５】[0035]
【表４】 [Table 4]
【手続補正５】[Procedure amendment 5]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００３６[Name of item to be corrected] 0036
【補正方法】追加[Correction method] Added
【補正内容】[Correction content]
【００３６】[0036]
【表５】 [Table 5]
【手続補正６】[Procedure Amendment 6]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００３７[Name of item to be corrected] 0037
【補正方法】追加[Correction method] Added
【補正内容】[Correction content]
【００３７】[0037]
【表６】 [Table 6]
【手続補正７】[Procedure Amendment 7]
【補正対象書類名】図面[Document name to be corrected] Drawing
【補正対象項目名】図１[Name of item to be corrected] Figure 1
【補正方法】追加[Correction method] Added
【補正内容】[Correction content]
【図１】 [Figure 1]
フロントページの続き (72)発明者 大西 克明 宮崎県日南市戸高1850番地、王子製紙株式 会社日南工場内 (72)発明者 林 建和 宮崎県日南市戸高1850番地、王子製紙株式 会社日南工場内Front page continuation (72) Inventor Katsuaki Onishi 1850 Todaka, Nichinan City, Miyazaki Prefecture, Nichinan Mill Co., Ltd. (72) Inventor Kenkazu Hayashi 1850 Todaka, Nichinan City, Miyazaki Prefecture Inside the South Factory
Claims (3)
ック平滑度が表裏共に６５〜１２０秒であり、かつ、密
度が０．８０ｇ／ｃｍ3 以上である上質紙において、Ｃ
Ｄの伸縮率が０．４５％以下であって、下記式１ Ｅｔ3 ≧０．２６ （１） 〔但し、式中ＥはＣＤの引張弾性率（ｋｇｆ／ｍｍ2 ）
を示し、ｔは紙の厚さ（ｍｍ）を示す〕を満たすことを
特徴とする電子写真用転写紙。1. A high-quality paper having a basis weight of 75 to 95 g / m 2 , a Bekk smoothness of 65 to 120 seconds on both sides, and a density of 0.80 g / cm 3 or more.
The expansion and contraction rate of D is 0.45% or less, and the following formula 1 Et 3 ≧ 0.26 (1) [where E is the tensile modulus of elasticity of CD (kgf / mm 2 )]
And t represents the thickness (mm) of the paper].
項１記載の電子写真用転写紙。2. The electrophotographic transfer paper according to claim 1, having a Hunter whiteness of 82% or more.
０〜１．３０である請求項１又は２に記載の電子写真用
転写紙。3. The fiber orientation ratio by the ultrasonic wave propagation method is 1.1.
The electrophotographic transfer paper according to claim 1 or 2, which is 0 to 1.30.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16828192A JP3833272B2 (en) | 1992-06-04 | 1992-06-04 | Electrophotographic transfer paper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16828192A JP3833272B2 (en) | 1992-06-04 | 1992-06-04 | Electrophotographic transfer paper |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002118037A Division JP3898974B2 (en) | 2002-04-19 | 2002-04-19 | Electrophotographic transfer paper |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05341553A true JPH05341553A (en) | 1993-12-24 |
| JP3833272B2 JP3833272B2 (en) | 2006-10-11 |
Family
ID=15865111
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16828192A Expired - Lifetime JP3833272B2 (en) | 1992-06-04 | 1992-06-04 | Electrophotographic transfer paper |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3833272B2 (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0718702A2 (en) | 1994-12-20 | 1996-06-26 | Fuji Xerox Co., Ltd. | Electrophotographic transfer paper |
| EP0718701A2 (en) | 1994-12-20 | 1996-06-26 | Fuji Xerox Co., Ltd. | Electrophotographic transfer paper and color image forming method |
| US5849447A (en) * | 1995-12-18 | 1998-12-15 | Fuji Xerox Co., Ltd. | Recording paper and recording method using the same |
| US6217708B1 (en) | 1996-04-09 | 2001-04-17 | Fuji Xerox Co., Ltd. | Double-side and full color transfer paper for electrophotography |
| WO2002025009A1 (en) * | 2000-09-21 | 2002-03-28 | Oji Paper Co,. Ltd. | Method of manufacturing newsprint |
| WO2006059358A1 (en) * | 2004-11-30 | 2006-06-08 | Pt. Pabrik Kertas Tjiwi Kimia Tbk. | Small information sheet |
| US7183027B2 (en) | 2003-09-10 | 2007-02-27 | Fuji Xerox Co., Ltd. | Image forming method |
| US7255918B2 (en) | 2002-06-10 | 2007-08-14 | Oji Paper Co., Ltd. | Coated paper sheet |
| CN100419582C (en) * | 2002-10-29 | 2008-09-17 | 富士胶片株式会社 | Image forming method, image forming instrument, electronic photograph printed matter |
-
1992
- 1992-06-04 JP JP16828192A patent/JP3833272B2/en not_active Expired - Lifetime
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6120954A (en) * | 1994-12-20 | 2000-09-19 | Fuji Xerox Co., Ltd. | Electrophotographic transfer paper and color image forming method |
| EP0718701A2 (en) | 1994-12-20 | 1996-06-26 | Fuji Xerox Co., Ltd. | Electrophotographic transfer paper and color image forming method |
| EP0718702A3 (en) * | 1994-12-20 | 1997-05-02 | Fuji Xerox Co Ltd | Electrophotographic transfer paper |
| US5637383A (en) * | 1994-12-20 | 1997-06-10 | Fuji Xerox Co., Ltd. | Electrophotographic transfer paper |
| US5925446A (en) * | 1994-12-20 | 1999-07-20 | Fuji Xerox Co., Ltd. | Electrophotographic transfer paper and color image forming method |
| EP0718702A2 (en) | 1994-12-20 | 1996-06-26 | Fuji Xerox Co., Ltd. | Electrophotographic transfer paper |
| US5849447A (en) * | 1995-12-18 | 1998-12-15 | Fuji Xerox Co., Ltd. | Recording paper and recording method using the same |
| US6217708B1 (en) | 1996-04-09 | 2001-04-17 | Fuji Xerox Co., Ltd. | Double-side and full color transfer paper for electrophotography |
| WO2002025009A1 (en) * | 2000-09-21 | 2002-03-28 | Oji Paper Co,. Ltd. | Method of manufacturing newsprint |
| US7255918B2 (en) | 2002-06-10 | 2007-08-14 | Oji Paper Co., Ltd. | Coated paper sheet |
| CN100419582C (en) * | 2002-10-29 | 2008-09-17 | 富士胶片株式会社 | Image forming method, image forming instrument, electronic photograph printed matter |
| US7183027B2 (en) | 2003-09-10 | 2007-02-27 | Fuji Xerox Co., Ltd. | Image forming method |
| WO2006059358A1 (en) * | 2004-11-30 | 2006-06-08 | Pt. Pabrik Kertas Tjiwi Kimia Tbk. | Small information sheet |
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|---|---|
| JP3833272B2 (en) | 2006-10-11 |
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