JP2019065402A - Watercolor painting paper and its manufacturing method - Google Patents
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Description
本発明は水彩画用紙及びその製造方法に関する。更に詳しくは適度な絵具発色性を有し、また好適な見た目の白さを有する水彩画用紙及びその製造方法に関する。 The present invention relates to a watercolor paper and a method of manufacturing the same. More particularly, the present invention relates to a watercolor drawing paper having suitable paint colorability and having a suitable appearance whiteness, and a method for producing the same.
従来、水彩画用紙に必要な特性を付与するための様々な提案がなされている。例えば、特許文献１には、水性絵具の水が速やかに紙の内部に吸収され、画線がにじまず、均一な発色性を持ち、経時により紙が変色したり、強度劣化したりしにくい高級水彩紙を得る方法が提案されている。また特許文献２ではケミカルパルプに無緊張状態でマーセライズ処理したマリー麻繊維を混抄することによって、水彩画用紙中のセルロース繊維上に吸着される色素粒子の密度を増加させ、色素の深度効果を達成し、絵具の画用紙上での色再現性が測れる水彩画用紙を得る方法が提案されている。 Heretofore, various proposals have been made to provide watercolor paper with the necessary characteristics. For example, according to Patent Document 1, the water of the water-based paint is rapidly absorbed into the inside of the paper, the streaks do not blur, and the color development is uniform, and the paper is not easily discolored or deteriorated in strength with time. A method has been proposed to obtain high-class watercolor paper. Further, in Patent Document 2, the density of pigment particles adsorbed on cellulose fibers in watercolor drawing paper is increased by mixing paper with marized hemolyzed fibers in a non-tensioned state in chemical pulp, and the effect of depth of pigment is achieved. A method has been proposed for obtaining a watercolor paper which can measure the color reproducibility of the paint on the drawing paper.
水彩画用紙に必要な適性として上記のような水の吸収性、発色性、色再現性が求められる上に、近年では塗布した絵具の色の再現性の良い白さを持った水彩画用紙が強く求められている。種類が異なるが、印刷用紙では見た目の白さを付与する様々な提案がされており、特許文献３ではパルプを主成分とする基紙の両面に無機顔料と接着剤を含む顔料塗工層が設けられ、前記顔料塗工層に含まれる無機顔料の８０質量％以上が炭酸カルシウムであり、前記顔料塗工層は紫色染料及び／又は青色染料及び蛍光染料が含まれ、白色度が８５％以上である印刷用塗工紙が提案されている。 In addition to the above-mentioned water absorbability, color development and color reproducibility required as aptitude necessary for watercolor paper, in recent years, watercolor paper having good whiteness of reproducibility of the color of the applied paint is strongly sought. It is done. Although different types of printing paper are proposed, various proposals have been made to provide apparent whiteness in printing paper, and in Patent Document 3, a pigment-coated layer containing an inorganic pigment and an adhesive on both sides of a pulp-based base paper is used. 80% by mass or more of the inorganic pigment contained in the pigment coating layer is calcium carbonate, the pigment coating layer contains a violet dye and / or a blue dye and a fluorescent dye, and the whiteness is 85% or more Coated papers for printing have been proposed.
この様に紙の白さを向上させる提案が種々されているが、特許文献３の様な蛍光染料を添加する方法では、水彩画を展示する場合に光や熱による蛍光染料の失活で白色度が容易に低下してしまうという問題がある。また、青又は紫色の染料による黄味減少による白さ改善ではパルプが持つ黄味との関係でくすみが出て白さの改善効果が低減してしまう問題点もある。 As described above, various proposals have been made to improve the whiteness of paper. However, in the method of adding a fluorescent dye as disclosed in Patent Document 3, when displaying a watercolor image, the whiteness is caused by the deactivation of the fluorescent dye by light or heat. Is easily lowered. In addition, in the improvement of whiteness due to the reduction of yellowishness by the blue or purple dye, there is a problem that the blur appears due to the relation to the yellowness of the pulp and the improvement effect of the whiteness is reduced.
本発明はこのような問題を鑑みてなされたものであり、その目的とするところは、高い絵具の発色性を維持しながら好適な見た目の白さを有する水彩画用紙及びその製造方法を提供することにある。 The present invention has been made in view of such problems, and an object of the present invention is to provide a watercolor drawing paper having a suitable appearance whiteness while maintaining high colorability of a paint, and a method for producing the same. It is in.
本発明の他の目的並びに作用効果については、以下の記述を参照することにより、当業者であれば容易に理解されるであろう。 Other objects and effects of the present invention will be easily understood by those skilled in the art with reference to the following description.
本発明の水彩画用紙は、パルプと白色顔料とを含有する基紙の少なくとも一方の表面に塗布層を設けてなる水彩画用紙であって、前記基紙にはパルプ全量に対して５０質量％以上のコットンリンターパルプが含まれており、前記基紙中の白色顔料の含有量が３〜１２質量％であり、前記塗布層にはゼラチンが片面あたり固形分換算で０．３〜１０ｇ／ｍ2含まれており、ＪＩＳ Ｐ ８１４８：２００１により測定した白色度が８３％以上であることを特徴とする。 The watercolor drawing paper of the present invention is a watercolor drawing paper provided with a coating layer on at least one surface of a base paper containing pulp and a white pigment, and the base paper contains 50% by mass or more based on the total amount of pulp. Cotton linter pulp is contained, the content of the white pigment in the base paper is 3 to 12% by mass, and the coating layer contains 0.3 to 10 g / m 2 of gelatin in terms of solid content per one side It is characterized in that the whiteness measured by JIS P 8148: 2001 is 83% or more.
そして、このような構成によれば、塗布層に含有されるゼラチンによって紙中への絵具の浸透が抑制され、それにより絵具について高い発色性を維持しながらも、好適な見た目の白さを有する水彩画用紙とすることができる。 And according to such a configuration, the gelatin contained in the coating layer suppresses the penetration of the paint into the paper, thereby having a suitable appearance whiteness while maintaining high colorability of the paint. It can be watercolor paper.
また、本発明の水彩画用紙においては、前記白色顔料が、炭酸カルシウム、酸化チタン、硫酸バリウムより選ばれる１種又は２種以上であってもよい。このような構成によれば、より白色度が高く、絵具の発色性に優れる水彩画用紙とすることができる。 In the watercolor drawing paper of the present invention, the white pigment may be one or more selected from calcium carbonate, titanium oxide and barium sulfate. According to such a configuration, it is possible to obtain a watercolor drawing paper which has higher whiteness and is excellent in coloring properties of paints.
また、本発明においては、前記パルプのＪＩＳ Ｐ ８１２１：１９９５による濾水度が、３５０〜７５０ｍｌＣＳＦであってもよい。このような構成によれば、濾水度が適切な範囲であるため地合いが整いやすく、水彩画に適した紙面を得やすくなる。 In the present invention, the freeness of the pulp according to JIS P 8121: 1995 may be 350 to 750 ml CSF. According to such a configuration, since the freeness is in an appropriate range, the texture is easily adjusted, and it is easy to obtain a paper surface suitable for a watercolor painting.
本発明においては、前記基紙及び／又は前記塗布層には、更にサイズ剤が含まれていてもよい。このような構成によれば、サイズ剤により絵具の浸透がより抑制されることにより発色も向上し、適度な絵具のハジキも実現可能となる。 In the present invention, the base paper and / or the coated layer may further contain a sizing agent. According to such a configuration, the coloring agent is improved by the penetration of the paint being further suppressed by the sizing agent, and it becomes possible to realize appropriate repelling of the paint.
また、本発明においては、前記塗布層には、更に紙力増強剤が含まれていてもよい。このような構成によれば、紙力増強剤により湿潤強度が向上することで、水彩絵具使用後の浪打や変形がより抑制される。 In the present invention, the coating layer may further contain a paper strength agent. According to such a configuration, the wet strength is improved by the paper strengthening agent, whereby the impact and deformation after use of the watercolor paint are further suppressed.
また、本発明の水彩画用紙においては、ＪＩＳ Ｐ ８１５０：２００４により測定したｂ＊値が−５．５〜５．５であってもよい。このような構成によれば、蛍光色の強くない自然な白さの水彩画用紙とすることができる。 Moreover, in the watercolor drawing paper of this invention, b * value measured by JISP 8150: 2004 may be -5.5-5.5. According to such a configuration, it is possible to obtain a watercolor paper having a natural whiteness which is not strong in fluorescent color.
また、本発明は水彩画用紙の製造方法としても捉えることができる。本発明に係る水彩画用紙の製造方法は、コットンリンターパルプを５０質量％以上含有するパルプを水中に分散してパルプスラリーとする工程と、該パルプスラリーに抄紙後の紙中の含有量が３〜１２質量％となるよう白色顔料を添加して紙料を調製する工程と、紙料を用いて抄紙機にて基紙を抄造する工程と、基紙の少なくとも一方の面に、ゼラチンを含む塗布液をゼラチンの片面当たりの含有量が固形分換算で０．３〜１０ｇ／ｍ2となるように塗布する工程とを有し、ＪＩＳ Ｐ ８１４８：２００１により測定した白色度が８３％以上であることを特徴とする。 In addition, the present invention can also be understood as a method of producing watercolor paper. The method for producing a watercolor drawing paper according to the present invention comprises the steps of dispersing a pulp containing 50 mass% or more of cotton linter pulp in water to make a pulp slurry, and a content of 3 to 3 in paper after making the pulp slurry. A step of preparing a stock by adding a white pigment so as to be 12% by mass, a step of forming a base paper with a paper machine using the stock, and coating containing gelatin on at least one surface of the base paper Coating the solution so that the content of gelatin per one side is 0.3 to 10 g / m 2 in terms of solid content, and the whiteness measured according to JIS P 8148: 2001 is 83% or more It is characterized by
そして、このような構成によれば、絵具について高い発色性を維持しながらも好適な見た目の白さを有する水彩画用紙を容易に製造することができる。 And according to such a configuration, it is possible to easily manufacture a watercolor drawing paper having a suitable appearance whiteness while maintaining high color development of the paint.
本発明によれば、高い絵具の発色性を維持しながら好適な見た目の白さを有する水彩画用紙及び水彩画用紙を提供することが可能となる。 ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the watercolors paper and watercolors paper which have the whiteness of a suitable appearance, maintaining high color development of a paint.
以下に、本発明に係る水彩画用紙の好適な一実施例を添付図面を参照しながら詳細に説明する。 Hereinafter, a preferred embodiment of a watercolor drawing sheet according to the present invention will be described in detail with reference to the attached drawings.
（基紙の構成）
本発明に係る水彩画用紙は、パルプと白色顔料とを含有する基紙に、ゼラチンを含む塗布層を設けたものである。先ずはじめに、基紙の構成について説明を行う。本発明において基紙に用いるパルプとしては、基紙中のパルプ全量に対して５０％以上のコットンリンターパルプを配合することが必要である。コットンリンターパルプは他の木材パルプと比べて比較的繊維長が長いので、毛管現象により絵具の吸収及び広がりを適度に向上させることができ、水彩画用紙として好適な基紙が得られる。コットンリンターパルプの配合割合は５０％以上であれば特に限定するものではないが、絵具の吸収の面からは６０％以上がより好ましく、７０％以上であれば更に好ましい。またコットンリンターパルプの配合上限については特に定めるものではないが、コットンリンターパルプはＮＢＫＰなどと比較して一般に黄味が強い傾向があるので、水彩画用紙の見た目の白さを求める場合には８０％以下であることが好ましく、７５％以下であればより好ましい。
(Structure of base paper)
The watercolor drawing paper according to the present invention is a base paper containing pulp and a white pigment provided with a coating layer containing gelatin. First, the configuration of the base paper will be described. As pulp used for the base paper in the present invention, it is necessary to blend 50% or more of cotton linter pulp with respect to the total amount of pulp in the base paper. Cotton linter pulp has a relatively long fiber length as compared to other wood pulps, so that capillary absorption can appropriately improve the absorption and spreading of the paint, and a base paper suitable as a watercolor drawing paper can be obtained. The compounding ratio of cotton linter pulp is not particularly limited as long as it is 50% or more, but from the viewpoint of absorption of paint, 60% or more is more preferable, and 70% or more is further preferable. Also, the upper limit of the composition of cotton linter pulp is not particularly limited, but since cotton linter pulp tends to have a strong yellowness generally compared to NBKP etc., 80% is required to determine the whiteness of watercolor drawing paper It is preferable that it is the following and it is more preferable if it is 75% or less.
本発明においてコットンリンターパルプと共に用いる繊維は特に限定するものではなく、針葉樹晒クラフトパルプ（ＮＢＫＰ）、針葉樹晒サルファイトパルプ（ＮＢＳＰ）、広葉樹晒クラフトパルプ（ＬＢＫＰ）、広葉樹晒サルファイトパルプ（ＬＢＳＰ）に代表される木材漂白化学パルプ、ＧＰ（砕木パルプ）、ＴＭＰ（サーモメカニカルパルプ）、ＢＣＴＭＰ（晒ケミサーモメカニカルパルプ）等の機械パルプ、古紙パルプ等の中から適宜選択して使用することができる。また、本発明において用いるパルプは木材パルプに限定するものではないため、楮、三椏、雁皮、麻、バガス、ケナフ、竹、コットンリンターなどの非木材パルプ、合成パルプ、合成繊維などを使用してもよい。 The fibers used together with cotton linter pulp in the present invention are not particularly limited, and softwood bleached kraft pulp (NBKP), softwood bleached sulfite pulp (NBSP), hardwood bleached kraft pulp (LBKP), hardwood bleached sulfite pulp (LBSP) Can be selected from mechanical pulps such as wood bleached chemical pulp, GP (groundwood pulp), TMP (thermomechanical pulp), BCTMP (bleached chemithermomechanical pulp), recycled paper pulp, etc. . In addition, since the pulp used in the present invention is not limited to wood pulp, non-wood pulp such as persimmon, third base, burlap, hemp, bagasse, kenaf, bamboo, cotton linter, synthetic pulp, synthetic fiber etc. It is also good.
本発明において用いられるパルプの濾水度は特に限定するものではないが、カナダ標準濾水度（フリーネス）（ＪＩＳ Ｐ ８１２１：１９９５「パルプのろ水度試験方法」）で、３５０〜７５０ｍｌＣＳＦとすることが好ましく、４００〜７００ｍｌであればより好ましい。ここで本発明における濾水度とは、２種以上のパルプを併用する場合には、混合後のパルプスラリーの濾水度を意味する。濾水度をこの範囲とすることで地合いを整えることが容易となり、水彩画に適した紙面を得やすくなる。 The freeness of the pulp used in the present invention is not particularly limited, but it is 350 to 750 ml CSF by Canadian Standard Freeness (JIS P 8121: 1995 "Test method of freeness of pulp"). Is preferable, and 400 to 700 ml is more preferable. Here, the degree of freeness in the present invention means the degree of freeness of the pulp slurry after mixing when two or more types of pulp are used in combination. By setting the freeness in this range, it becomes easy to adjust the texture, and it becomes easy to obtain a paper surface suitable for watercolor painting.
本発明において、パルプスラリーに配合する白色顔料としては、水和珪酸、ホワイトカーボン、タルク、カオリン、クレー、炭酸カルシウム、酸化チタン、アルミノケイ酸塩、焼成クレー、硫酸バリウム、合成樹脂填料などの公知の白色顔料の中から１種以上を使用することができる。この中でも、白さ向上の効果が大きいことから炭酸カルシウム、酸化チタン、硫酸バリウムが好ましく、加えて、水彩画用紙の保存性向上に効果があることから炭酸カルシウムが特に好ましい。 In the present invention, as the white pigment to be added to the pulp slurry, known white pigments such as hydrated silica, white carbon, talc, kaolin, clay, calcium carbonate, titanium oxide, aluminosilicate, calcined clay, barium sulfate, synthetic resin filler and the like One or more of white pigments can be used. Among these, calcium carbonate, titanium oxide and barium sulfate are preferable because they have a large effect of improving whiteness, and calcium carbonate is particularly preferable because they are effective in improving the storability of watercolor drawing paper.
パルプスラリーに添加する白色顔料の配合量は、抄紙後の紙中の白色顔料含有量が３〜１２質量％となるように決定する。具体的には、ワイヤー工程での脱落など抄紙工程での白色顔料の歩留まりを考慮して配合量を決定すればよい。白色顔料の含有量が３質量％未満だと紙の白さを向上させる効果が乏しく、逆に１２質量％を超えると水彩絵具を塗布したときの浸透性が悪くなるとともに、塗布した絵具の濃度が出にくくなるという問題がある。 The blending amount of the white pigment to be added to the pulp slurry is determined so that the white pigment content in the paper after papermaking is 3 to 12% by mass. Specifically, the blending amount may be determined in consideration of the yield of the white pigment in the paper making process such as dropping off in the wire process. When the content of the white pigment is less than 3% by mass, the effect of improving the whiteness of the paper is poor, and when it exceeds 12% by mass, the permeability when applying the watercolor paint is deteriorated and the concentration of the applied paint is reduced. Is difficult to get out.
本発明においてパルプスラリーには、内添サイズ剤を添加してもよい。用いる内添サイズ剤としては良好なサイズ性を発揮するものが好ましく、例えば、パラフィンワックス系サイズ剤、マイクロクリスタリンワックス系サイズ剤、カルナウバ（カルナバワックス）系サイズ剤、アルキルケテンダイマー（表中ではＡＫＤと略）ワックス系サイズ剤、ロジン系サイズ剤、アルケニル無水コハク酸サイズ剤等を１種以上使用することができる。本発明は水彩画用紙に関する発明であるから、これらの内添サイズ剤の中でも、絵具の浸透を抑えて発色を向上させ、更に水彩画の技法である適度な絵具のハジキも実現できるという点から、アルキルケテンダイマーワックス系サイズ剤が好適である。 In the present invention, an internal sizing agent may be added to the pulp slurry. Preferred internal sizing agents are those which exhibit good sizing properties, such as paraffin wax-type sizing agents, microcrystalline wax-type sizing agents, carnauba (carnauba wax) -type sizing agents, alkyl ketene dimers (in the table, AKD) It is possible to use one or more kinds of wax-based sizing agents, rosin-based sizing agents, alkenyl succinic anhydride sizing agents and the like. Since the present invention is an invention relating to watercolor drawing paper, among these internally added sizing agents, it is possible to suppress the penetration of the paint to improve color development, and further to realize an appropriate paint brushing which is a technique of watercolor painting. Ketene dimer wax sizing agents are preferred.
水彩画用紙は水彩絵具により画像を形成するために紙面が水にさらされることが多いことから、水彩画用紙には耐水性を付与して表面の毛羽立ちなどの肌（紙面）の荒れを防止し、水彩絵具が乾燥した後の水彩画用紙の波打ちや変形を防止する必要がある。そのため本発明の水彩画用紙では、基紙に紙力増強剤を含有させることが望ましい。このような紙力増強剤としては、ポリアミドエピクロロヒドリン系紙力増強剤、澱粉、カチオン化澱粉、その他変性澱粉、ポリアクリルアミド系樹脂、尿素ホルマリン樹脂、メラミンホルマリン樹脂、植物ガム、ポリビニルアルコール、変性ポリビニルアルコール、ゴム系ラテックス、ポリエチレンオキサイド、ポリアミド樹脂などを１種以上使用することができる。これらの中でも湿潤強度を大きく向上させるという点から、ポリアミドエピクロルヒドリン系の紙力増強剤が特に好ましい。 Watercolor paper is often exposed to water in order to form an image with watercolors, so water resistance is given to watercolor paper to prevent roughening of the skin (paper) such as fuzz on the surface It is necessary to prevent waving and deformation of the watercolor paper after the paint has dried. Therefore, in the watercolor printing paper of the present invention, it is desirable that the base paper contain a paper strengthening agent. As such paper strengthening agents, polyamide epichlorohydrin based paper strengthening agents, starch, cationized starch, other modified starches, polyacrylamide based resin, urea formalin resin, melamine formalin resin, vegetable gum, polyvinyl alcohol, etc. One or more kinds of modified polyvinyl alcohol, rubber latex, polyethylene oxide, polyamide resin and the like can be used. Among these, a polyamide epichlorohydrin-based paper strengthening agent is particularly preferable in terms of greatly improving the wet strength.
また、パルプスラリーには、本発明の目的とする効果を損なわない範囲で、嵩高剤、硫酸バンド、歩留まり向上剤、濾水性向上剤、ピッチコントロール剤等の各種製紙用資材を含有させてもよい。但し、蛍光増白剤は経時により紙の白色度を低下させるので含有させないことが望ましい。 The pulp slurry may also contain various paper making materials such as bulking agents, sulfuric acid bands, retention aids, drainage improvers, pitch control agents, etc., as long as the intended effects of the present invention are not impaired. . However, it is desirable not to add a fluorescent whitening agent because it reduces the whiteness of the paper over time.
（抄紙方法）
本発明において基紙の抄紙方法としては、特に限定するものではなく、円網抄紙機、短網抄紙機、長網抄紙機、これらの抄紙機のコンビネーション抄紙機など従来から周知の抄紙機を使用して、単層または抄合わせにて抄造できる。抄合わせでは抄合わせ各層の層間剥離を防止するために層間用澱粉等の紙力剤をスプレー塗布しても良い。
(Papermaking method)
In the present invention, the method for making the base paper is not particularly limited, and a conventionally known paper machine such as a cylinder paper machine, a fourdrinier paper machine, a fourdrinier paper machine, or a combination paper machine of these paper machines is used. Then, it can be made into a single layer or a paper combination. In papermaking, a paper strength agent such as starch for interlayers may be spray-coated to prevent delamination of the papermaking layers.
（塗布層の構成）
次に、塗布層の構成について説明を行う。先にも説明したように、本発明においては基紙の表面にゼラチンを含む塗布液を塗布することで塗布層を設ける。本願発明者等の知見によれば、水彩画用紙の表面にゼラチンを含む塗布層を設けることで水彩絵具を塗布した際に紙面の紙剥けや毛羽立ちなどを防止することができ、更には絵具の定着性を向上させる効果もある。ここで用いるゼラチンとしては特に限定しないが、水彩画用紙の白色度を向上させるためにはゼラチン製造過程の抽出初期で得られるゼリー強度の高いゼラチンを用いることが好ましい。抽出初期で得られるゼラチンは、抽出時にかかる熱量が少ない為にゼラチン自体の黄味も少なく、基紙に塗布した場合でも白色度の低下や黄味の増加を抑えることができる。
(Structure of coating layer)
Next, the configuration of the coating layer will be described. As described above, in the present invention, the coating layer is provided by applying a coating solution containing gelatin to the surface of the base paper. According to the findings of the inventors of the present invention, by providing a coating layer containing gelatin on the surface of watercolor drawing paper, it is possible to prevent paper peeling and fuzzing of paper when applying a watercolor paint, and further, fixing of paint. It also has the effect of improving gender. The gelatin used herein is not particularly limited, but in order to improve the whiteness of watercolor drawing paper, it is preferable to use gelatin having high jelly strength obtained at the beginning of extraction in the gelatin manufacturing process. The gelatin obtained at the initial stage of extraction has a small amount of heat applied at the time of extraction, so the yellowness of gelatin itself is small, and even when coated on a base paper, the decrease in whiteness and the increase in yellowness can be suppressed.
基紙へのゼラチンの塗布方法は特に限定するものではなく、サイズプレス方式、ディッピング方式、コーター方式、スプレー方式等の各種公知の塗布方式により塗布することができる。 There is no particular limitation on the method of coating gelatin on the base paper, and the coating can be performed by various known coating methods such as a size press method, a dipping method, a coater method, and a spray method.
また本発明においては、塗布液にはゼラチン以外の各種助剤を加えてもよい。例えば、水彩画用紙の表面強度を更に向上させる目的であれば澱粉、ポリビニルアルコール、ポリアクリルアミド等の紙力増強剤を添加することができる。また、サイズ性を向上させる目的であればスチレンアクリル系樹脂、アルキルケテンダイマー等の表面サイズ剤を添加してもよい。これらの中でもアルキルケテンダイマーワックス系サイズ剤は、添加することで絵具の浸透を抑え、発色を向上させ、水彩画の技法である適度な絵具のハジキも実現できることから、水彩画用紙には好ましい。 In the present invention, various assistants other than gelatin may be added to the coating solution. For example, for the purpose of further improving the surface strength of watercolor drawing paper, a paper strength agent such as starch, polyvinyl alcohol, polyacrylamide and the like can be added. Moreover, you may add surface sizing agents, such as a styrene acrylic resin and an alkyl ketene dimer, if it is the purpose of improving size property. Among these, alkyl ketene dimer wax-based sizing agents are preferable for watercolor drawing paper because they can suppress the penetration of paints by adding them, improve the color development, and also realize appropriate paint repelling that is a technique of watercolor painting.
本発明において塗布層中のゼラチンの含有量は、基紙の片面当たり０．３〜１０．０ｇ／ｍ2であり、１．０〜８．０ｇ／ｍ2であれば好ましく、４．０〜７．０ｇ／ｍ2であればより好ましい。ゼラチンの基紙片面当たりの含有量が０．３ｇ／ｍ2未満になると、絵具の定着性に劣り、水彩画用紙の表面強度も弱くなることから絵具を塗布したときに紙の表面が剥け易くなる。さらに絵具が浸透し過ぎることで水彩画用紙表面での絵具濃度が低下することに加え、絵具を重ね塗りした時に先に塗った絵具が脱落しやすくなる。一方、ゼラチンの含有量が１０．０ｇ／ｍ2を超えると、ゼラチンの持つ黄味の影響で十分な白色度が得られにくいことに加え、過剰となったゼラチンが塗布後の乾燥工程でのドライヤー等に付着し、工程機器を汚すおそれがある。また、蓄積されたドライヤー等の汚れが紙面に転写されることで水彩画用紙を汚すおそれもある。 In the present invention, the content of gelatin in the coating layer is 0.3 to 10.0 g / m 2 per one side of the base paper, preferably 1.0 to 8.0 g / m 2 , and 4.0 to It is more preferable if it is 7.0 g / m 2 . When the content of gelatin per one side of the base paper is less than 0.3 g / m 2 , the fixability of the paint is poor and the surface strength of the watercolor drawing paper is weak, and the surface of the paper is easily peeled off when the paint is applied. . Furthermore, in addition to the fact that the paint density on the surface of the watercolor paper is lowered due to the penetration of the paint, the paint that has been previously applied tends to fall off when the paint is overcoated. On the other hand, when the content of gelatin exceeds 10.0 g / m 2 , it is difficult to obtain sufficient whiteness due to the influence of gelatin yellowishness, and in the drying step after coating with excess gelatin, It adheres to the dryer and may contaminate the process equipment. In addition, there is also a possibility that the watercolor drawing paper may be stained by transferring the accumulated dirt such as the dryer to the paper.
本発明の水彩画用紙は、ＪＩＳ Ｐ ８１４８：２００１により測定した白色度を８３．０％以上とし、好ましくは８５．０％以上とし、より好ましくは８６．０％以上とする。白色度が８３％未満となると、見た目の白さに劣るために好ましくない。基紙に塗布するゼラチンは一般的に黄味がかっているため、基紙にゼラチンを塗布すると白色度は低下する傾向にある。従って、基紙の白色度はゼラチン塗布後の水彩画用紙で必要とする白色度よりもやや高めに設定することが好ましい。水彩画用紙の白色度を向上させる方法は色々あるが、一例として、白色度の高いパルプを使用する、黄味の少ないゼラチンを使用する、等が挙げられる。 The watercolor drawing paper of the present invention has a whiteness of 83.0% or more, preferably 85.0% or more, and more preferably 86.0% or more as measured according to JIS P 8148: 2001. If the whiteness is less than 83%, it is not preferable because the whiteness of the appearance is inferior. Since gelatin applied to base paper is generally yellowish, whiteness tends to decrease when gelatin is applied to base paper. Therefore, it is preferable to set the whiteness of the base paper to be slightly higher than the whiteness required for watercolor printing paper after gelatin coating. There are various methods for improving the whiteness of watercolor drawing paper, but one example is using a pulp with high whiteness, using gelatin with less yellowness, and the like.
本発明の水彩画用紙は、ＪＩＳ Ｐ ８１５０：２００４により測定したｂ＊値を−５．５〜５．５の範囲とすることが好ましく、−４．０〜４．０の範囲であればより好ましい。ｂ＊値をこのような範囲とすることで、蛍光色の強くない自然な白さの水彩画用紙とすることができる。ｂ＊値が−５．５より小さくなると、青味が増して見た目の白さを損なったり、蛍光色の比較的強い白さとなるおそれがある。逆に５．５より大きくなると、黄味が増して見た目の白さを損なうおそれがある。ｂ＊値をこの範囲とする方法は色々あるが、一例として白色度が高くｂ＊値が比較的低いパルプを使用すること、微量の着色剤の使用による調整等が挙げられる。基紙に塗布するゼラチンは一般的に黄味がかっているため、基紙にゼラチンを塗布すると、ｂ＊値は上昇する傾向となる。従って、基紙のｂ＊値は、ゼラチン塗布後の水彩画用紙で必要とするｂ＊値よりもやや低めに設定することが好ましい。 The watercolor drawing paper of the present invention preferably has a b * value measured according to JIS P 8150: 2004 in the range of -5.5 to 5.5, and more preferably in the range of -4.0 to 4.0 . By setting the b * value to such a range, it is possible to obtain a watercolor paper with natural whiteness that is not strong in fluorescent color. If the b * value is smaller than -5.5, the bluish color may be increased to impair the appearance whiteness or the fluorescent color may be relatively strong whiteness. On the other hand, when it is larger than 5.5, yellowishness may be increased to impair the appearance whiteness. There are various methods for setting the b * value in this range, but examples include using a pulp having high whiteness and a relatively low b * value, adjustment by using a small amount of coloring agent, and the like. Because gelatin applied to base paper is generally yellowish, b * values tend to increase when gelatin is applied to base paper. Therefore, the b * value of the base paper is preferably set to be slightly lower than the b * value required for water-based printing paper after gelatin application.
次に、実施例及び比較例を挙げて本発明をより具体的に説明するが、本発明はこれらの例に限定されるものではない。また、例中の「部」、「％」は、特に断らない限りそれぞれ固形分換算での質量部又は質量％を示す。 Next, the present invention will be more specifically described by way of examples and comparative examples, but the present invention is not limited to these examples. Moreover, unless otherwise indicated, "part" and "%" in an example show the mass part or mass% in conversion of solid content, respectively.
尚、以下に示すゼラチンのｂ＊値は、色彩・濁度同時測定器（ＣＯＨ−４００型／日本電色工業製）を用い、ＪＩＳ Ｚ ８７２２：２００９に準拠し、濃度９質量％のゼラチン溶液をセルに入れて透過光にて測定した。 In addition, the b * value of gelatin shown below is a gelatin solution having a concentration of 9% by mass using a color and turbidity simultaneous measuring device (COH-400 / made by Nippon Denshoku Kogyo) in accordance with JIS Z 8722: 2009. Were placed in the cell and measured with transmitted light.
コットンリンターパルプ（ガオミ社製）５０部とＮＢＫＰ（ＲＡＹＯＮＩＥＲ社製）５０部とを水中に分散後叩解して、フリーネス６１０ｍｌＣＳＦであるパルプスラリーを得た。該パルプスラリーにカチオン澱粉（ネオタック４０Ｔ、日本食品化工製）１部を添加し、更に抄紙後の含有率が４質量％となるように白色顔料の炭酸カルシウム（ソフトン１５００、備北粉化工業製）を秤量して添加し紙料を得て、その後、紙料を抄紙して乾燥し、坪量３００ｇ／ｍ2の基紙を得た。次に、濃度９質量％のゼラチン水溶液（Ｒ微粉、新田ゼラチン製、ゼリー強度１００ｇ、ｂ＊値＝２０．４）１００部（ゼラチン固形分ではなくゼラチン水溶液としての部数）にアルキルケテンダイマー（ＳＥ２３６０、星光ＰＭＣ製）０．２部を添加してサイズプレス液（塗布液）を得た後、サイズプレスにて基紙の片面当たりに乾燥固形分１０．１ｇ／ｍ2となるように塗布することで水彩画用紙を得た。 After dispersing 50 parts of cotton linter pulp (manufactured by Gaomi Co., Ltd.) and 50 parts of NBKP (manufactured by RAYONIER Co., Ltd.) in water, they were beaten to obtain a pulp slurry having a freeness of 610 ml CSF. 1 part of cationic starch (Neotac 40T, manufactured by Nippon Shokuhin Kako Co., Ltd.) is added to the pulp slurry, and the white pigment calcium carbonate (SOFTONE 1500, manufactured by Bihoku Powder Chemical Industry) so that the content after paper making is 4% by mass. The resulting mixture was weighed and added to obtain a stock, and then the stock was made and dried to obtain a base paper with a basis weight of 300 g / m 2 . Next, an alkyl ketene dimer (the number of portions as a gelatin aqueous solution, not the gelatin solid content) is 100 parts of a gelatin aqueous solution having a concentration of 9% by mass (R fine powder, Nitta gelatin, jelly strength 100 g, b * value = 20.4). After adding 0.2 parts of SE2360 (manufactured by Starlight PMC) to obtain a size press liquid (coating liquid), the size press is applied so that the dry solid content is 10.1 g / m 2 per one side of the base paper I got watercolor paper by doing.
パルプの配合割合をコットンリンターパルプを１００部、ＮＢＫＰを０部とし、サイズプレス液のゼラチン濃度を４．５質量％、基紙片面当たりの塗布量を乾燥固形分で５．５ｇ／ｍ2とした以外は実施例１と同様にして水彩画用紙を得た。 The blending ratio of pulp is 100 parts of cotton linter pulp and 0 part of NBKP, the gelatin concentration of the size press liquid is 4.5% by mass, and the coated amount per one side of the base paper is 5.5 g / m 2 in dry solid content. Watercolor paper was obtained in the same manner as in Example 1 except for the above.
サイズプレス液のゼラチン濃度を４．５質量％、基紙片面当たりの塗布量を乾燥固形分で５．４ｇ／ｍ2とした以外は実施例１と同様にして水彩画用紙を得た。 Watercolor paper was obtained in the same manner as in Example 1 except that the gelatin concentration of the size press solution was 4.5% by mass, and the coating amount per one side of the base paper was 5.4 g / m 2 as dry solid.
炭酸カルシウムを抄紙後の含有率が３質量％となるように基紙に添加した以外は実施例２と同様にして水彩画用紙を得た。 A watercolor drawing sheet was obtained in the same manner as in Example 2 except that calcium carbonate was added to the base paper so that the content after paper making was 3% by mass.
炭酸カルシウムを抄紙後の含有率が１２質量％となるように基紙に添加した以外は実施例２と同様にして水彩画用紙を得た。 A watercolor drawing paper was obtained in the same manner as in Example 2 except that calcium carbonate was added to the base paper so that the content after papermaking would be 12% by mass.
炭酸カルシウムを抄紙後の含有率が４質量％となるように基紙に添加し、更に酸化チタン（Ａ−１１０、堺化学製）を抄紙後の含有率が３．５質量％となるように基紙に添加した以外は実施例３と同様にして水彩画用紙を得た。 Calcium carbonate is added to the base paper so that the content after papermaking is 4% by mass, and titanium oxide (A-110, manufactured by Sakai Chemical Co., Ltd.) is further such that the content after papermaking is 3.5% by mass A watercolor drawing sheet was obtained in the same manner as in Example 3 except that the base paper was added.
サイズプレス液のゼラチンを＃３００（新田ゼラチン製、ゼリー強度３００ｇ、９質量％溶液のＪＩＳ Ｚ ８７２２により測定したｂ＊値＝１１．４）に変更し、基紙片面当たりの塗布量を乾燥固形分で１０．０ｇ／ｍ2とした以外は実施例１と同様にして水彩画用紙を得た。 Change the gelatin of the size press liquid to # 300 (Nitta gelatin, made of Nitta Gelatin, 300 g of jelly strength, b * value measured according to JIS Z 8722 of 9% by mass solution = 11.4) and dry the coated amount per one side of the base paper A watercolor drawing paper was obtained in the same manner as in Example 1 except that the solid content was 10.0 g / m 2 .
サイズプレス液のゼラチン濃度を１０．０質量％、基紙片面当たりの塗布量を乾燥固形分で１１．５ｇ／ｍ2とした以外は実施例１と同様にして水彩画用紙を得た。 A watercolor drawing paper was obtained in the same manner as Example 1, except that the gelatin concentration of the size press solution was 10.0% by mass, and the coating amount per one side of the base paper was 11.5 g / m 2 as dry solid.
サイズプレス液のゼラチン濃度を１．０質量％、基紙片面当たりの塗布量を乾燥固形分で１．０ｇ／ｍ2とした以外は実施例１と同様にして水彩画用紙を得た。 Watercolor paper was obtained in the same manner as in Example 1 except that the gelatin concentration of the size press solution was 1.0% by mass, and the coating amount per one side of the base paper was 1.0 g / m 2 as dry solid.
パルプの配合割合を、コットンリンターパルプを１００部、ＮＢＫＰを０部に変更した以外は実施例１と同様にして水彩画用紙を得た。 A watercolor drawing paper was obtained in the same manner as in Example 1 except that the blending ratio of pulp was changed to 100 parts of cotton linter pulp and 0 parts of NBKP.
パルプの配合割合を、コットンリンターパルプを４０部、ＮＢＫＰを６０部に変更した以外は実施例１と同様にして水彩画用紙を得た。 A watercolor drawing paper was obtained in the same manner as in Example 1 except that the blending ratio of pulp was changed to 40 parts of cotton linter pulp and 60 parts of NBKP.
パルプの配合割合を、コットンリンターパルプを０部、ＮＢＫＰを１００部に変更した以外は実施例１と同様にして水彩画用紙を得た。 A watercolor drawing paper was obtained in the same manner as in Example 1 except that the blending ratio of pulp was changed to 0 parts of cotton linter pulp and 100 parts of NBKP.
炭酸カルシウムの添加を無しとした以外は実施例２と同様にして水彩画用紙を得た。 A watercolor paper was obtained in the same manner as in Example 2 except that calcium carbonate was not added.
炭酸カルシウムを抄紙後の含有率が２．４質量％となるように添加した以外は実施例２と同様にして水彩画用紙を得た。 A watercolor drawing sheet was obtained in the same manner as in Example 2 except that calcium carbonate was added so that the content after papermaking would be 2.4% by mass.
炭酸カルシウムを抄紙後の含有率が１６質量％となるように添加した以外は実施例２と同様にして水彩画用紙を得た。 A watercolor drawing sheet was obtained in the same manner as in Example 2 except that calcium carbonate was added so that the content after paper making would be 16% by mass.
サイズプレス液のゼラチン濃度を１２質量％、基紙片面当たりの塗布量を乾燥固形分で１４．０ｇ／ｍ2とした以外は実施例１と同様にして水彩画用紙を得た。 A watercolor drawing sheet was obtained in the same manner as Example 1, except that the gelatin concentration of the size press solution was 12% by mass, and the coating amount per one side of the base paper was 14.0 g / m 2 as dry solid.
サイズプレス液のゼラチン濃度を０．２質量％、基紙片面当たりの塗布量を乾燥固形分で０．２ｇ／ｍ2とした以外は実施例１と同様にして水彩画用紙を得た。 Watercolor paper was obtained in the same manner as in Example 1 except that the gelatin concentration of the size press solution was 0.2% by mass, and the coating amount per one side of the base paper was 0.2 g / m 2 as dry solid.
各実施例及び比較例で得られた水彩画用紙の構成と評価を図１に示す。尚、各評価は以下の方法で行った。 The structure and evaluation of the watercolor drawing paper obtained in each Example and Comparative Example are shown in FIG. In addition, each evaluation was performed by the following method.
＜白色顔料含有量＞
ＪＩＳ Ｐ ８２５１：２００３「紙、板紙及びパルプ−灰分試験方法−５２５℃燃焼法」に従い各実施例及び各比較例にて得られた水彩画用紙を強熱し、得られた灰分を測定してその測定値を白色顔料の含有量とした。また、炭酸カルシウムと酸化チタンのそれぞれの含有量は、灰分の測定で得られた灰を原子吸光光度法及び吸光光度法により成分分析して求めた。
<White pigment content>
According to JIS P 8251: 2003 "Paper, paperboard and pulp-test method of ash content-525 ° C combustion method", the watercolor drawing paper obtained in each example and each comparative example is ignited, and the obtained ash content is measured and measured The value was taken as the content of the white pigment. Further, the content of each of calcium carbonate and titanium oxide was determined by component analysis of the ash obtained by the measurement of the ash content by atomic absorption photometry and absorption photometry.
＜白色度＞
分光式色差計(ＰＦ−１０、日本電色工業製)を用い、ＪＩＳ Ｐ ８１４８：２００１（紙及び板紙及びパルプ−ＩＳＯ白色度（拡散青色光反射率）の測定方法）に準拠して各実施例及び各比較例にて得られた水彩画用紙の表面（フェルト面）を測定して白色度とした。
<Whiteness>
Using a spectral color difference meter (PF-10, manufactured by Nippon Denshoku Kogyo Co., Ltd.), each implementation in accordance with JIS P 8148: 2001 (paper and paperboard and pulp-measurement method of ISO whiteness (diffuse blue light reflectance)) The surface (felt surface) of the watercolor drawing paper obtained in each of the examples and the comparative examples was measured to obtain whiteness.
＜ｂ＊値＞
分光式色差計(ＰＦ−１０、日本電色工業製)を用い、ＪＩＳ Ｐ ８１５０：２００４（紙及び板紙−色（Ｃ／２°）の測定方法−拡散照明法）に準拠して各実施例及び各比較例にて得られた水彩画用紙の表面（フェルト面）を測定してｂ＊値とした。
<B * value>
Each example according to JIS P 8150: 2004 (paper and paperboard-measuring method of color (C / 2 °)-diffuse lighting method) using a spectral color difference meter (PF-10, manufactured by Nippon Denshoku Kogyo Co., Ltd.) And the surface (felt surface) of the watercolor painting paper obtained by each comparative example was measured, and it was set as b * value.
＜絵具濃度＞
水彩画用紙では絵具を塗布したときに良好な発色が得られること、換言すれば高い色濃度が得られることが機能として重視されている。ここでは、水彩用絵具（商品名：キナクリドンレッド、ホルベイン工業株式会社製）を蒸留水で１０倍に希釈した絵具液を、各実施例及び各比較例にて得られた水彩画用紙の同じ個所に平筆で１５ｃｍの長さで６回重ね塗りして、自然乾燥後の色の濃度を濃度計（Ｘ-Ｒｉｔｅ ｅＸａｃｔ、サカタインクスエンジニアリング製）で測定して絵具濃度とした。絵具濃度の評価としては、前述の測定方法により０．７５以上の絵具濃度が得られた水彩画用紙を発色良好として合格とした。
<Color density>
With watercolor paper, it is important as a function that good color development can be obtained when a paint is applied, in other words, high color density can be obtained. Here, a paint solution obtained by diluting a watercolor paint (trade name: quinacridone red, manufactured by Holbein Kogyo Co., Ltd.) 10 times with distilled water is applied to the same portion of the watercolor drawing paper obtained in each example and each comparative example. It was overcoated 6 times at a length of 15 cm with a plain brush, and the color density after natural drying was measured with a densitometer (X-Rite eXact, manufactured by Sakata Inx Engineering) to obtain a paint density. As the evaluation of the paint concentration, it was judged that the watercolor drawing paper from which the paint concentration of 0.75 or more was obtained by the above-mentioned measurement method was regarded as good in color development.
図１から明らかなように、各実施例で得られた水彩画用紙は、絵具を塗布した際に、高い絵具濃度を維持しながら好適な見た目の白さを有するものであった。 As is clear from FIG. 1, the watercolor paper obtained in each of the examples had a suitable appearance whiteness while maintaining a high paint density when the paint was applied.
実施例１、比較例１〜３の結果から明らかなように、パルプ全量に占めるコットンリンターパルプの配合率が高くなる程、抄紙後の基材の白色度が低下してｂ＊値が増加する。これは併用したＮＢＫＰよりもコットンリンターパルプの方が白色度が低く、ｂ＊値が高い為である。このため、コットンリンターパルプの配合率が高く、さらに塗布液中のゼラチン含有量が多く、これにより基紙へのゼラチンの付着量も多くなったために比較例１は見た目の白さの点で不合格となった。比較例２、３のようにコットンリンターパルプの配合量が低めのものは、見た目の白色度は良好であるが毛管現象による絵具の吸収及び広がりが低下するので、絵具濃度が低くなった。 As is clear from the results of Example 1 and Comparative Examples 1 to 3, the whiteness of the base material after paper making decreases and the b * value increases as the blending ratio of cotton linter pulp to the total amount of pulp increases. . This is because cotton linter pulp has lower whiteness and higher b * value than the combined NBKP. For this reason, the blending ratio of cotton linter pulp is high, the gelatin content in the coating solution is high, and the adhesion amount of gelatin to the base paper is also increased thereby, Comparative Example 1 is not good in appearance whiteness. It passed. As in Comparative Examples 2 and 3, when the blending amount of the cotton linter pulp is lower, the paint density is lowered because the appearance whiteness is good but the absorption and spread of the paint due to the capillary phenomenon are reduced.
実施例１、７の結果から明らかなように、塗布層中のゼラチンをｂ＊値の低いものにすることにより、より見た目の白さを向上させることができる。 As apparent from the results of Examples 1 and 7, the appearance whiteness can be further improved by setting the gelatin in the coated layer to a low b * value.
コットンリンターパルプの配合が５０％である実施例１、３、８、９、比較例７、８及びコットンリンターパルプの配合が１００％である実施例２、比較例１の結果から明らかなように、塗布層中のゼラチンの含有量が多いものほど見た目の白さが低下する傾向にある。これは、ゼラチン自体が黄味を持っているために、塗布層にゼラチンが多く含有されるほど紙の白色度が低下し、ｂ＊値が増加してしまうからである。その一方で、塗布層のゼラチン含有量が多くなるにつれて絵具の浸透性、保持性が向上するため、絵具濃度は高くなっていく。比較例８のようにゼラチンの含有量が少ない場合は見た目の白さは非常に良好であるが、絵具の浸透性、保持性が低下して絵具濃度に劣るものとなり不合格となってしまう。 As is apparent from the results of Examples 1, 3, 8, 9 and Comparative Examples 7 and 8 in which the composition of cotton linter pulp is 50%, and Examples 2 and 1 in which the composition of cotton linter pulp is 100%. The higher the content of gelatin in the coating layer, the lower the apparent whiteness tends to be. This is because, since the gelatin itself has a yellowish color, the more the gelatin is contained in the coating layer, the whiteness of the paper decreases and the b * value increases. On the other hand, as the gelatin content of the coating layer increases, the permeability and retention of the paint improve, so the paint concentration increases. When the content of gelatin is small as in Comparative Example 8, the whiteness of the appearance is very good, but the permeability and the retention of the paint are lowered to deteriorate the density of the paint, resulting in rejection.
実施例２、４、５、比較例４、５、６の結果から明らかなように、基紙に含まれる白色顔料の量が多くなるほど水彩画用紙の見た目の白さが増加する。これは、今回の実施例及び比較例において白色顔料として用いた炭酸カルシウムがコットンリンターパルプよりも白色度が高いために、白色顔料の含有率の増加がそのまま白色度の向上と黄味の低減に寄与するためである。その一方で、白色顔料の含有率が増加するにつれて紙の繊維間の空隙も減少してゼラチンが基紙に浸透しにくくなるために、絵具の浸透性、保持性が低下し、絵具の濃度が低くなる。これに加えて白色顔料の遮蔽性により塗布された絵具が表面から見えにくくなる影響もあり、さらに絵具濃度が低下する。実施例３、６の結果から明らかなように、白色顔料として炭酸カルシウムと酸化チタンを併用することで、炭酸カルシウムを単独使用する場合よりも見た目の白さの向上が見込めるものの、絵具濃度は低下する。 As apparent from the results of Examples 2, 4, 5 and Comparative Examples 4, 5, 6, the apparent whiteness of the watercolor paper increases as the amount of the white pigment contained in the base paper increases. This is because calcium carbonate used as a white pigment in the present example and comparative example has a whiteness higher than that of cotton linter pulp, so an increase in the content of the white pigment directly improves the whiteness and reduces the yellowishness. It is to contribute. On the other hand, as the content of the white pigment increases, the gaps between the fibers of the paper decrease and the gelatin hardly penetrates the base paper, so the permeability and retention of the paint decrease and the density of the paint decreases. It gets lower. In addition to this, there is also an influence that the paint applied by the shielding property of the white pigment becomes difficult to be seen from the surface, and the paint density is further reduced. As is clear from the results of Examples 3 and 6, although calcium carbonate and titanium oxide are used in combination as white pigments, although the appearance whiteness can be expected to be improved as compared with the case of using calcium carbonate alone, the paint concentration is lowered. Do.
Claims (7)
該パルプスラリーに抄紙後の紙中の含有量が３〜１２質量％となるよう白色顔料を添加して紙料を調製する工程と、
紙料を用いて抄紙機にて基紙を抄造する工程と、
基紙の少なくとも一方の面に、ゼラチンを含む塗布液をゼラチンの片面当たりの含有量が固形分換算で０．３〜１０ｇ／ｍ2となるように塗布する工程とを有し、
ＪＩＳ Ｐ ８１４８：２００１により測定した白色度が８３％以上であることを特徴とする水彩画用紙の製造方法。 Dispersing pulp containing 50 mass% or more of cotton linters pulp in water to prepare a pulp slurry;
Preparing a paper stock by adding a white pigment to the pulp slurry so that the content in the paper after paper making is 3 to 12% by mass;
A process of making a base paper with a paper machine using a stock;
Applying a coating solution containing gelatin on at least one side of the base paper so that the content of gelatin per one side is 0.3 to 10 g / m 2 in terms of solid content;
A method for producing a watercolor drawing paper, wherein the whiteness measured according to JIS P 8148: 2001 is 83% or more.
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