JP4377425B2 - Manufacturing method of fine coated paper - Google Patents
Manufacturing method of fine coated paper Download PDFInfo
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- JP4377425B2 JP4377425B2 JP2007263655A JP2007263655A JP4377425B2 JP 4377425 B2 JP4377425 B2 JP 4377425B2 JP 2007263655 A JP2007263655 A JP 2007263655A JP 2007263655 A JP2007263655 A JP 2007263655A JP 4377425 B2 JP4377425 B2 JP 4377425B2
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Landscapes
- Paper (AREA)
Description
本発明は、微塗工紙の製造方法に関するものである。特に、米坪が６０ｇ／ｍ2以下と軽量でありながら高剛度であり、塗工量が片面あたり１０ｇ／ｍ2以下と低塗工量でありながら白色度、白紙光沢度、印刷光沢度に優れた微塗工紙の製造方法に関するものである。 The present invention relates to a method for producing finely coated paper. In particular, it has a high rigidity with a weight of 60 g / m 2 or less, and a coating amount of 10 g / m 2 or less per side and a low coating amount, while maintaining whiteness, blank paper gloss, and printing gloss. The present invention relates to a method for producing an excellent finely coated paper.
現在、低コストで効率的に塗工紙を製造するために、抄紙機と塗工機とが一体化したオンマシンコーターが幅広く用いられている。オンマシンコーターによる塗工方式としては、主にフィルム転写方式とブレード塗工方式とがある。このうち、ゲートロールコーターやロッドメタリングコーターのようなフィルム転写コーターは、コンパクトで、操業性がよく、また、種々の製品要求品質に対応が容易であることから、オンマシンでのサイズ剤塗工設備や顔料塗工設備として多く採用されている。
フィルム転写方式は、アプリケーターロール上の計量された塗工液を原紙（基紙）に転写する方式であり、塗工時に原紙にかかる負荷がブレード塗工方式と比較して相対的に小さいため、操業時の断紙トラブル等が少ないという利点があり、極めて高い生産効率を得ることができる。また、フィルム転写コーターは、原紙表面の輪郭に沿った塗工、いわゆる輪郭塗工を行うことができるため、原紙表面の被覆性が高く、塗工紙を製造するに適しているといえる。
印刷用紙は、省資源化、輸送コストの低減等の面から、用紙の軽量化、つまりは塗工紙から微塗工紙への移行が進んでいる。軽量化の手段としては、原紙米坪の低減および塗工量の低減であるが、原紙米坪の低減は、紙厚が薄くなることによる剛度の低下を招き、塗工量の低減は、白紙光沢度や印刷光沢度の低下の問題がある。剛度の低下は、高速印刷や自動制御、紙の搬送に不具合が生じる問題が発生しやすく、また、原紙紙厚が薄くなることは、昨今の印刷物に対するフルカラー化に印刷不透明度という点で相反する面も有している。塗工量を低減すると、表面の被覆性が低下し、白紙光沢度や印刷光沢度が低下するだけでなく、光沢ムラが発生して美粧性が低下する。これらの問題を解決し、軽量化を図りながら剛度を維持し、高速印刷を可能にした微塗工紙の開発が要望されている。
剛度を向上させるためには、より強靭な針葉樹パルプを配合する方法があるが（特許文献１）、繊維長の長い針葉樹パルプの増配は、表面性の低下や印刷適性の低下を招き、印刷適性が低下するため好ましくない、また、平坦化工程の線圧を低下させることで、剛度の低下を最小限に抑える方法が考えられるが、用紙に平坦性、光沢性を付与できず、印刷後に印字部の光沢が低下するため、好ましくない。
低線圧でも充分な白紙光沢度、印刷光沢度を得る方法としては、潰れやすい有機顔料を添加する方策があるが、塗工液の流動性を悪化させ、塗工ムラや光沢ムラが発生するなど、品質面、作業面の両方において好ましくない。
The film transfer method is a method of transferring the measured coating solution on the applicator roll to the base paper (base paper), and the load on the base paper during coating is relatively small compared to the blade coating method, There is an advantage that there are few paper break troubles at the time of operation, and extremely high production efficiency can be obtained. Moreover, since the film transfer coater can perform coating along the contour of the base paper surface, so-called contour coating, it can be said that the surface of the base paper has high coverage and is suitable for producing coated paper.
Printing paper is becoming lighter, that is, a shift from coated paper to finely coated paper from the viewpoints of resource saving and transportation cost reduction. As a means of weight reduction, reduction of the base paper weight of the paper and reduction of the coating amount are reduced, but the reduction of the base paper weight of the paper basis causes a decrease in rigidity due to a decrease in the paper thickness. There is a problem of decrease in glossiness and printing glossiness. The decrease in stiffness is likely to cause problems in high-speed printing, automatic control, and paper conveyance. Also, the reduction in thickness of the base paper contradicts the current full colorization in terms of printing opacity. It also has a surface. When the coating amount is reduced, the surface coverage is lowered, and not only the white paper glossiness and printing glossiness are lowered, but also gloss unevenness occurs and the cosmetic properties are lowered. There is a demand for the development of finely coated paper that solves these problems, maintains rigidity while reducing weight, and enables high-speed printing.
In order to improve the rigidity, there is a method of blending a tougher softwood pulp (Patent Document 1). However, the increase in the distribution of softwood pulp having a long fiber length causes a decrease in surface properties and a decrease in printability, resulting in printability. However, it is not preferable because it reduces the linear pressure in the flattening process, and a method of minimizing the decrease in stiffness can be considered, but the flatness and glossiness cannot be imparted to the paper, and printing is performed after printing. This is not preferable because the gloss of the portion is lowered.
As a method of obtaining sufficient blank paper glossiness and printing glossiness even at a low linear pressure, there is a method of adding an organic pigment that is easily crushed, but the fluidity of the coating liquid is deteriorated, resulting in coating unevenness and gloss unevenness. It is not preferable in terms of both quality and work.
本発明が解決しようとする主たる課題は、米坪が６０ｇ／ｍ2以下と軽量でありながら高剛度を有し、塗工量が片面あたり１０ｇ／ｍ2以下と低塗工量でありながら白色度、白紙光沢度、印刷光沢度性に優れた微塗工紙の製造方法に関するものである。なお、「微塗工紙」とは、顔料塗工層の塗工量が片面で１２ｇ／ｍ2以下の塗工紙を指すが、本発明の微塗工紙は、塗工量が片面で１０ｇ／ｍ2以下の塗工紙を対象とする。 The main problem to be solved by the present invention is that while the weight per square meter is 60 g / m 2 or less and light weight, it has high rigidity and the coating amount is 10 g / m 2 or less per side while it is white and white. The present invention relates to a method for producing a finely coated paper having an excellent strength, white paper glossiness and printing glossiness. The “fine coated paper” refers to a coated paper having a pigment coating layer coating amount of 12 g / m 2 or less on one side, but the fine coated paper of the present invention has a coating amount on one side. For coated paper of 10 g / m 2 or less.
この課題を解決した本発明は、次のとおりである。
〔請求項１記載の発明〕
基紙の少なくとも片面上に、
酸化澱粉を主成分とする塗料を片面あたり０．１ｇ／ｍ2〜１．０ｇ／ｍ2で塗布し、
前記酸化澱粉の塗布後に線圧１０〜５０ＫＮ／ｍでカレンダー処理を行い、
顔料とバインダーを主成分とする少なくとも１層の顔料塗工層をフィルム転写型ロールコーターで片面あたり６．０ｇ／ｍ2〜９．５ｇ／ｍ2塗布し、
さらに金属ロール温度１００℃以上、線圧１００〜６００ＫＮ／ｍでカレンダー処理し、
これら酸化澱粉塗工、カレンダー処理、顔料塗工、カレンダー処理をこの順にオンマシンで行う微塗工紙の製造方法であって、
前記基紙の原料パルプに占める古紙パルプの質量割合が７０％以上であり、
パルプスラリーに、カチオン性凝結剤、カチオン性凝集剤をスクリーン前、アニオン性凝集剤をスクリーン後に添加し、
前記アニオン性凝集剤がベントナイトまたはコロイダルシリカであり、
前記顔料に、平均粒子径０．４μｍ〜０．８μｍ、アスペクト比が５以上のデラミネーテッドクレーを顔料１００質量部に対して１０〜５０質量部含有させ、
前記デラミネーテッドクレー以外のクレーを顔料１００質量部に対して１０〜５０質量部含有させ、
酸化澱粉と顔料塗工層の合計が片面あたり５．１ｇ／ｍ2〜１０ｇ／ｍ2とし、
緊度が１．０ｇ／ｃｍ3〜１．２ｇ／ｃｍ3、 かつ、次の式により導く比こわさが０．２５ｍ2／ｇ〜０．４ｍ2／ｇ、ＪＩＳ Ｐ ８１４２による白紙光沢度が３０〜６０％、米坪が６０ｇ／ｍ2以下である微塗工紙を得ることを特徴とする微塗工紙の製造方法。
比こわさ（ｍ2／ｇ）＝（剛度（縦）× 剛度（横））1/2 ÷ 米坪
The present invention that has solved this problem is as follows.
[Invention of Claim 1]
On at least one side of the base paper,
A coating mainly composed of oxidized starch is applied at a rate of 0.1 g / m 2 to 1.0 g / m 2 per side ,
After application of the oxidized starch , calendar treatment is performed at a linear pressure of 10 to 50 KN / m,
At least one pigment coating layer mainly composed of a pigment and a binder is applied with a film transfer type roll coater to 6.0 g / m 2 to 9.5 g / m 2 per side ,
Furthermore, it is calendered at a metal roll temperature of 100 ° C. or higher and a linear pressure of 100 to 600 KN / m,
These oxidized starch coating, calendering, pigment coating, and calendering in this order are on-machine manufacturing methods for finely coated paper,
The weight ratio of waste paper pulp to the raw material pulp of the base paper is 70% or more,
Add a cationic coagulant and a cationic flocculant to the pulp slurry before the screen and an anionic flocculant after the screen.
The anionic flocculant is bentonite or colloidal silica;
The pigment contains 10 to 50 parts by mass of delaminated clay having an average particle diameter of 0.4 to 0.8 μm and an aspect ratio of 5 or more with respect to 100 parts by mass of the pigment,
10 to 50 parts by mass of clay other than the delaminated clay is contained with respect to 100 parts by mass of the pigment,
Total oxidized starch and pigment coating layer and per side 5.1g / m 2 ~10g / m 2 ,
Bulk density is 1.0g / cm 3 ~1.2g / cm 3 and a ratio stiffness to lead the following expression is 0.25m 2 /g~0.4m 2 / g, the white paper gloss according to JIS P 8142 30 A method for producing finely coated paper, comprising obtaining finely coated paper having -60% and a basis weight of 60 g / m 2 or less.
Specific stiffness (m 2 / g) = (Stiffness (length) × Stiffness (width)) 1/2 ÷ US tsubo
〔請求項２記載の発明〕
前記ベントナイトをパルプに対して純分で０．１重量％〜５．０重量％添加する請求項１に記載の微塗工紙の製造方法。
[Invention of Claim 2]
The method for producing a finely coated paper according to claim 1, wherein the bentonite is added in a pure content of 0.1 wt% to 5.0 wt% with respect to the pulp.
〔請求項３記載の発明〕
前記カチオン性凝結剤がポリエチレンイミンであり、前記カチオン性凝集剤がポリアクリルアミドである請求項１または２に記載の微塗工紙の製造方法。
[Invention of Claim 3]
The method for producing finely coated paper according to claim 1 or 2, wherein the cationic coagulant is polyethyleneimine and the cationic flocculant is polyacrylamide.
〔請求項４記載の発明〕[Invention of Claim 4]
前記カチオン性凝集剤の平均分子量が６００万〜１６００万である請求項１〜３のいずれか１項に記載の微塗工紙の製造方法。The method for producing a finely coated paper according to any one of claims 1 to 3, wherein the cationic flocculant has an average molecular weight of 6 million to 16 million.
米坪が６０ｇ／ｍ2以下と軽量でありながら高剛度を有し、塗工量が片面あたり１０ｇ／ｍ2以下と低塗工量でありながら白色度、白紙光沢度、印刷光沢度に優れた微塗工紙が得られる。 It has a high rigidity with a weight of less than 60 g / m 2 , and excellent in whiteness, white paper gloss, and printing gloss while having a low coating weight of 10 g / m 2 or less per side. A finely coated paper is obtained.
次に、本発明の実施の形態を説明する。
〔微塗工紙〕
本発明に係る微塗工紙は、基紙に澱粉からなる塗工液をロール塗工した後に、顔料と接着剤からなる塗工液をロール塗工し、表面仕上げを行うことにより製造できる。
本発明に係る微塗工紙は、基紙表面に、好適にはロールコーターによるフィルム転写方式にて水溶性高分子を塗布し、この水溶性高分子の塗布後に、同じくフィルム転写方式にて、顔料および接着剤を主成分とする顔料塗工層が設けられている。水溶性高分子としては、澱粉やその誘導体、ポリビニルアルコールやポリアクリル酸塩などの合成高分子、紙力増強剤、サイズ剤などを挙げることができる。
本発明において特に好ましい水溶性高分子は、澱粉であり、この澱粉を基紙にフィルム転写塗布することにより、低塗工量でも紙の剛度を向上させることができ、顔料および接着剤をフィルム転写塗工することにより、低塗工量でも白紙光沢、印刷光沢を向上でき、かつ、これら塗工量を減少させ、紙全体に占めるパルプの割合を上昇させることで、低米坪、特に６０ｇ／ｍ2以下の微塗工紙において、高速印刷に耐え得る充分な剛度が得られるのである。
Next, an embodiment of the present invention will be described.
[Fine coated paper]
The finely coated paper according to the present invention can be produced by roll-coating a coating liquid made of starch on a base paper, then roll-coating a coating liquid made of a pigment and an adhesive, and performing surface finishing.
The finely coated paper according to the present invention is preferably applied to the surface of the base paper by applying a water-soluble polymer by a film transfer method using a roll coater, and after the application of the water-soluble polymer, by the same film transfer method. A pigment coating layer mainly composed of a pigment and an adhesive is provided. Examples of water-soluble polymers include starch and derivatives thereof, synthetic polymers such as polyvinyl alcohol and polyacrylate, paper strength enhancers, and sizing agents.
A particularly preferred water-soluble polymer in the present invention is starch, and by applying this starch to a base paper by film transfer, the rigidity of the paper can be improved even at a low coating amount. By coating, it is possible to improve white paper gloss and printing gloss even at a low coating amount, and by reducing these coating amounts and increasing the proportion of pulp in the entire paper, low rice basis weight, particularly 60 g / Sufficient rigidity that can withstand high-speed printing can be obtained with fine coated paper of m 2 or less.
得られる微塗工紙は、緊度が１．０ｇ／ｃｍ3〜１．２ｇ／ｃｍ3、かつ、次の式により導く比こわさが、０．２５ｍ2／ｇ〜０．４５ｍ2／ｇであることが好ましく、０．３０ｍ2／ｇ〜０．４０ｍ2／ｇであることがより好ましく、０．３２ｍ2／ｇ〜０．４０ｍ2／ｇであることが最も好ましい。
比こわさ（ｍ2／ｇ）＝（剛度（縦）×剛度（横））1/2 ÷ 米坪
ここに剛度及び米坪の測定方法は後記参照される。比こわさが０．２５ｍ2／ｇ未満であると、腰がない塗工紙となり、加工や印刷作業性が低下し、ペラペラとした手肉感のない安っぽい紙になる。他方、比こわさが０．４０ｍ2／ｇを超えると、印刷用途において取り扱いにくいほど剛直になり、印刷作業性が低下する。
Lightly coated paper obtained is bulk density is 1.0g / cm 3 ~1.2g / cm 3 and a ratio stiffness to lead the following expression is at 0.25m 2 /g~0.45m 2 / g preferably there, more preferably 0.30m 2 /g~0.40m 2 / g, and most preferably 0.32m 2 /g~0.40m 2 / g.
Specific stiffness (m 2 / g) = (rigidity (longitudinal) × rigidity (horizontal)) 1/2 ÷ tsubo We refer to the measurement methods of stiffness and tsubo here. When the specific stiffness is less than 0.25 m 2 / g, it becomes a coated paper that is not stiff, the processing and printing workability is lowered, and it becomes a cheesy paper that does not have a flickering hand feeling. On the other hand, if the specific stiffness exceeds 0.40 m 2 / g, it becomes so rigid that it is difficult to handle in printing applications, and printing workability is reduced.
このような塗工紙を得るには、塗工紙片面あたりの塗工量は、水溶性高分子と顔料塗工層の合計が３ｇ／ｍ2〜１０ｇ／ｍ2となることが好ましい。また、前記水溶性高分子の塗布量は０．１〜１．５ｇ／ｍ2であり、前記顔料塗工層の塗工量が２．９〜９．９ｇ／ｍ2であることが好ましい。塗工量が３ｇ／ｍ2未満では剛度だけでなく白紙光沢度に劣り、塗工量が１０ｇ／ｍ2を超えると、剛度のみならず嵩高性に劣る。
また、水溶性高分子を塗布した後に、プレカレンダーにより平坦化処理することで、顔料塗工後の平滑性、光沢性を向上でき、かつ、塗工層の軽量化を進めることができる。
To obtain such a coated paper, coating weight per coated paper one side, it is preferred that the total of the water-soluble polymer and the pigment coating layer is 3g / m 2 ~10g / m 2 . The coating amount of the water-soluble polymer is preferably 0.1 to 1.5 g / m 2 , and the coating amount of the pigment coating layer is preferably 2.9 to 9.9 g / m 2 . When the coating amount is less than 3 g / m 2 , not only the rigidity but also the white paper glossiness is inferior. When the coating amount exceeds 10 g / m 2 , not only the rigidity but also the bulkiness is inferior.
In addition, by applying a water-soluble polymer and then performing a flattening treatment with a pre-calender, the smoothness and gloss after pigment coating can be improved, and the weight of the coating layer can be reduced.
顔料塗工層には、平均粒子径が０．２μｍ〜１．０μｍ、好ましくは０．４μｍ〜０．８μｍ、アスペクト比が５以上、好ましくは１０以上のデラミネーテッドクレーを、１０質量部〜６０質量部、より好ましくは１０質量部〜５０質量部含むことが好ましい。平均粒子径０．２μｍ以上であり、アスペクト比５以上のデラミネーテッドクレーは、塗工層表面の被覆性が高いため、低塗工量においても高い光沢性と平滑性を付与でき、また、印刷インキが塗工層表面に留まりやすく、印刷光沢を向上できるため好ましい。平均粒子径が０．２μｍを下回り、アスペクト比が５を下回るクレーでは、被覆性に劣るだけでなく、クレーが原紙に沈み込みやすいため、上記効果が得られない。アスペクト比の上限は特に限定されないが、概ね５０を超過すると、塗料の粘度が高くなり、塗工ムラが発生しやすいなど塗工性に劣り、また、クレー同士の重なり合いによる空隙が大きくなるため、印刷時にインキが均一な被膜を形成できず、印刷光沢が低下するため好ましくない。 In the pigment coating layer, a delaminated clay having an average particle size of 0.2 μm to 1.0 μm, preferably 0.4 μm to 0.8 μm, and an aspect ratio of 5 or more, preferably 10 or more, is 10 parts by mass to It is preferable to include 60 parts by mass, more preferably 10 parts by mass to 50 parts by mass. A delaminated clay having an average particle diameter of 0.2 μm or more and an aspect ratio of 5 or more has high coverage on the surface of the coating layer, and therefore can impart high gloss and smoothness even at a low coating amount. The printing ink is preferable because it tends to stay on the surface of the coating layer and can improve printing gloss. A clay having an average particle diameter of less than 0.2 μm and an aspect ratio of less than 5 is not only inferior in covering property, but also the clay is likely to sink into the base paper, and thus the above effect cannot be obtained. The upper limit of the aspect ratio is not particularly limited. However, if it exceeds approximately 50, the viscosity of the paint increases, coating properties such as coating unevenness are likely to occur, and voids due to overlapping of clays increase, The ink cannot form a uniform film at the time of printing, and the printing gloss is lowered.
一方で、本発明に係る微塗工紙は、ＪＩＳ Ｐ ８１４２：２００５に基づく白紙光沢度が、３０〜６０％であるのが好ましく、４０％〜４５％であるのがより好ましい。白紙光沢度が３０％未満であると、鮮明な印刷情報の鮮明さ、コントラストの良い印刷情報が表現できず、精細さを欠く。他方、白紙光沢度は６０％を超えても良いが、６０％以下とすることで、いわゆるギラギラとした視認を覚えない、目に優しい塗工紙となる。上記のとおり表面被覆性の良好なデラミネーテッドクレーを用い、かつ、顔料塗工層をフィルム転写塗工すると、低塗工量でありながら被覆性の高い塗工層表面が得られるため、白紙光沢度と印刷光沢度に優れた塗工紙となる。また、塗工後に光沢を付与するためのスーパーカレンダー処理において、所定の光沢度を得るために必要な線圧（ニップ圧）が低くて済むため、紙の潰れを最小限に抑えることができ、本発明の目的である、剛度に優れた微塗工紙が得られる。 On the other hand, the fine coated paper according to the present invention preferably has a white paper glossiness of 30 to 60% based on JIS P 8142: 2005, and more preferably 40 to 45%. If the glossiness of the blank paper is less than 30%, the clearness of the clear print information and the print information with good contrast cannot be expressed, and the fineness is lacking. On the other hand, the glossiness of blank paper may exceed 60%, but by setting it to 60% or less, it becomes a coated paper that does not seem to be so-called glaring and is easy on the eyes. As described above, when using a delaminated clay with good surface coverage and a film transfer coating of a pigment coating layer, a coating layer surface with high coverage can be obtained while having a low coating amount. Coated paper with excellent gloss and printing gloss. In addition, in the super calendar process for giving gloss after coating, the linear pressure (nip pressure) required to obtain a predetermined gloss level is low, so that the crushing of the paper can be minimized, A finely coated paper excellent in rigidity, which is an object of the present invention, is obtained.
〔パルプ配合〕
本形態の基紙は、原料パルプの種類が特に限定されない。原料パルプとしては、例えば、木材パルプ、非木材パルプ、合成パルプ、古紙パルプ、などから、より具体的には、砕木パルプ（ＧＰ）、ストーングランドパルプ（ＳＧＰ）、リファイナーグランドパルプ（ＲＧＰ）、加圧式砕木パルプ（ＰＧＷ）、サーモメカニカルパルプ（ＴＭＰ）、ケミサーモメカニカルパルプ（ＣＴＭＰ）、ブリーチケミサーモメカニカルパルプ（ＢＣＴＭＰ）等の機械パルプ（ＭＰ）、化学的機械パルプ（ＣＧＰ）、半化学的パルプ（ＳＣＰ）、広葉樹晒クラフトパルプ（ＬＢＫＰ）、針葉樹晒クラフトパルプ（ＮＢＫＰ）等のクラフトパルプ（ＫＰ）、ソーダパルプ（ＡＰ）、サルファイトパルプ（ＳＰ）、溶解パルプ（ＤＰ）等の化学的パルプ（ＣＰ）、ナイロン、レーヨン、ポリエステル、ポリビニルアルコール（ＰＶＡ）等を原料とする合成パルプ、脱墨パルプ（ＤＩＰ）、ウエストパルプ（ＷＰ）等の古紙パルプ、かすパルプ（ＴＰ）、木綿、アマ、麻、黄麻、マニラ麻、ラミー等を原料とするぼろパルプ、わらパルプ、エスパルトパルプ、バガスパルプ、竹パルプ、ケナフパルプ等の茎稈パルプ、靭皮パルプ等の補助パルプなどから、一種又は数種を適宜選択して使用することができる。
ただし、本形態の基紙は、原料パルプ種が、ＮＢＫＰ：ＬＢＫＰ：古紙パルプの質量割合が、０〜１０：０〜３０：７０〜１００とされているのが好ましく、５〜１０：１０〜２０：７０〜１００とされているのがより好ましい。ＮＢＫＰの質量割合が１０％を超えると、Ｎ材特有の長繊維のために均一な基紙地合を得がたく基紙の厚薄ムラが生じ易い。ＬＢＫＰの質量割合が３０％を超えると、基紙の密度が高くなり易く、厚み方向（Ｚ軸方向）のクッション性や嵩高性が低下する。古紙パルプの質量割合が７０％未満であると、古紙パルプ特有の平坦で柔軟な性状の繊維が少なくなり、用紙表面の平坦性、光沢性向上が低下する。
[Pulp blend]
As for the base paper of this form, the kind of raw material pulp is not specifically limited. Examples of the raw material pulp include wood pulp, non-wood pulp, synthetic pulp, and waste paper pulp. More specifically, ground pulp (GP), stone ground pulp (SGP), refiner ground pulp (RGP), additive pulp, and the like. Pressed ground pulp (PGW), thermomechanical pulp (TMP), chemithermomechanical pulp (CTMP), bleached chemithermomechanical pulp (BCTMP) and other mechanical pulp (MP), chemical mechanical pulp (CGP), semi-chemical pulp (SCP), hardwood bleached kraft pulp (LBKP), kraft pulp (KP) such as softwood bleached kraft pulp (NBKP), chemical pulp such as soda pulp (AP), sulfite pulp (SP), dissolved pulp (DP) (CP), nylon, rayon, polyester, polyvinyl alcohol Raw paper pulp such as synthetic pulp, deinked pulp (DIP), and waist pulp (WP), waste pulp (TP), cotton, flax, hemp, jute, manila hemp, ramie, etc. One or several kinds can be appropriately selected and used from slag pulp, straw pulp, esparto pulp, bagasse pulp, bamboo pulp, kenaf pulp, and other auxiliary pulps such as bast pulp.
However, in the base paper of this embodiment, the raw material pulp type is preferably such that the mass ratio of NBKP: LBKP: waste paper pulp is 0 to 10: 0 to 30:70 to 100. 20: 70-100 is more preferable. If the mass ratio of NBKP exceeds 10%, the base paper tends to have uneven thickness because it is difficult to obtain a uniform base paper formation due to the long fibers peculiar to the N material. When the mass ratio of LBKP exceeds 30%, the density of the base paper tends to be high, and cushioning properties and bulkiness in the thickness direction (Z-axis direction) are lowered. When the weight ratio of the used paper pulp is less than 70%, the number of flat and flexible fibers peculiar to the used paper pulp decreases, and the flatness and glossiness of the paper surface decrease.
〔ウエットエンド〕
本発明の微塗工紙を得るには、前記パルプからなるパルプスラリーに填料、凝結剤、凝集剤を添加することが好ましい。
＜凝結剤＞
凝結剤としては、例えばポリアクリルアミド（ＰＡＭ）、ポリビニルアミン（ＰＶＡｍ）、ポリジアリルジメチルアンモニウムクロライド（ポリダドマック、ＰＤＡＤＭＡＣ）、ポリアミン（ＰＡｍ）、ポリエチレンイミン（ＰＥＩ）等の有機高分子系凝結剤や、硫酸バンド、ポリ塩化アルミニウム等の無機系凝結剤があげられる。これらの中でも、ＰＡＭ、ＰＤＡＤＭＡＣ、ＰＡｍ及びＰＥＩの少なくとも１種を用いることが好ましい。特に、ＰＥＩはカチオン密度が高く、アニオン性の微細成分を効率的に集める作用が高いため、得られる原紙の表面性が向上できるため好ましい。ＰＥＩの平均分子量は１０万〜４００万が好ましく、１００万〜２００万であることがさらに好ましい。平均分子量が１０万未満であると、アニオン性の微細繊維を十分に吸着できなくなり、また、平均分子量が４００万を超過すると、アニオン性の微細繊維を集めすぎて原紙の地合いを崩し、塗工ムラや美粧性の低下を招くため、好ましくない。凝結剤の添加量は、カチオン要求量低減率と、カチオン性凝結剤添加後の紙料濾液のカチオン要求量とが満足されるように調整することが好ましい。したがって、カチオン性凝結剤の添加量は、後述する凝集剤の添加量にも左右されるが、パルプに対して固形分で０．１％〜０．５％、さらには０．１５％〜０．４％であることが好ましい。かかる凝結剤の添加量が０．１％未満では、その効果が不充分となる恐れがあり、一方０．５％を超えると、原紙の地合いを崩し、塗工ムラや美粧性の低下を招く恐れがある。
本発明においては、前記したように、パルプの調製段階で凝結剤を添加することが好ましいが、例えば、前記パルプ及び填料、並びに必要に応じて内添サイズ剤、定着剤、歩留り向上剤、カチオン化剤、紙力増強剤、消泡剤等の各種製紙助剤等は、配合チェストで混合されて完成原料となる。したがって、配合チェストからマシンチェストの間で凝結剤が添加されることが好ましく、カチオン性凝結剤を完成原料に充分に混合するには、配合チェストへ添加することがより好ましい。
[Wet end]
In order to obtain the finely coated paper of the present invention, it is preferable to add a filler, a coagulant, and a flocculant to the pulp slurry made of the pulp.
<Coagulant>
Examples of the coagulant include organic polymer coagulants such as polyacrylamide (PAM), polyvinylamine (PVAm), polydiallyldimethylammonium chloride (polydadomac, PDADMAC), polyamine (PAm), polyethyleneimine (PEI), and sulfuric acid. Examples thereof include inorganic coagulants such as bands and polyaluminum chloride. Among these, it is preferable to use at least one of PAM, PDADMAC, PAm, and PEI. In particular, PEI is preferable because it has a high cation density and a high action to efficiently collect anionic fine components, and thus the surface properties of the obtained base paper can be improved. The average molecular weight of PEI is preferably 100,000 to 4,000,000, and more preferably 1,000,000 to 2,000,000. If the average molecular weight is less than 100,000, the anionic fine fibers cannot be sufficiently adsorbed, and if the average molecular weight exceeds 4 million, the anionic fine fibers are collected too much and the texture of the base paper is destroyed. This is not preferable because it causes unevenness and a decrease in cosmetics. The addition amount of the coagulant is preferably adjusted so that the cation requirement reduction rate and the cation requirement of the paper filtrate after addition of the cationic coagulant are satisfied. Therefore, although the addition amount of the cationic coagulant depends on the addition amount of the flocculant described later, it is 0.1% to 0.5%, more preferably 0.15% to 0% in solid content with respect to the pulp. .4% is preferable. If the addition amount of the coagulant is less than 0.1%, the effect may be insufficient. On the other hand, if it exceeds 0.5%, the texture of the base paper is destroyed, resulting in coating unevenness and a decrease in cosmetic properties. There is a fear.
In the present invention, as described above, it is preferable to add a coagulant in the pulp preparation stage. For example, the pulp and filler, and if necessary, an internal sizing agent, a fixing agent, a yield improver, a cation Various paper-making aids such as an agent, a paper strength enhancer, and an antifoaming agent are mixed in a compounding chest to become a finished raw material. Accordingly, it is preferable that a coagulant is added between the compound chest and the machine chest, and in order to sufficiently mix the cationic coagulant with the finished raw material, it is more preferable to add the coagulant to the compound chest.
＜カチオン性凝集剤＞
本発明においては、前記パルプの調製段階でカチオン性凝結剤を添加した後、さらに該パルプの調製段階に続く抄紙工程前段でカチオン性凝集剤を添加することが好ましい。
紙料は、アニオン性を呈するパルプや填料からなるため、カチオン性凝集剤を添加することで、凝集作用を得ることができる。かかるカチオン性凝集剤としては、例えば平均分子量が６００万〜１６００万、さらには１０００万〜１４００万であり、かつカチオン化度が０〜１０ｍｅｑ／ｇのカチオン性水溶性重合体又は共重合体を使用することができる。本発明では、大きなフロックを形成できるＰＡＭを用いることが、微細繊維の歩留りを向上させ、原紙の表面性を改善できるため好ましい。カチオン性凝集剤の平均分子量が６００万未満であると、該カチオン性凝集剤を用いた効果が充分に発現されない恐れがあり、一方１６００万よりも大きいと、フロックが大きくなり地合いを崩し、塗工ムラや光沢ムラが発生するため好ましくない。また、カチオン化度が０ｍｅｑ／ｇ未満であると、該カチオン性凝集剤を用いた効果が充分に発現されない恐れがあり、一方、１０ｍｅｑ／ｇより大いと、フロックが大きくなり地合いを崩し、塗工ムラや光沢ムラが発生するため好ましくない。
またカチオン性凝集剤の添加量は、パルプに対して純分で０．０１％〜０．１％、さらには０．０２％〜０．０５％であることが好ましい。カチオン性凝集剤の添加量が０．０１％未満だと、所定の凝集効果が充分に発現されない恐れがあり、一方０．１％を超えると、フロックが大きくなり地合いを崩し、塗工ムラや光沢ムラが発生するため好ましくない。
<Cationic flocculant>
In the present invention, it is preferable that a cationic coagulant is added in the first stage of the paper making process following the pulp preparation stage after the cationic coagulant is added in the pulp preparation stage.
Since the paper stock is composed of pulp and filler exhibiting anionic property, the aggregation action can be obtained by adding a cationic flocculant. Examples of the cationic flocculant include a cationic water-soluble polymer or copolymer having an average molecular weight of 6 million to 16 million, more preferably 10 million to 14 million, and a cationization degree of 0 to 10 meq / g. Can be used. In the present invention, it is preferable to use PAM capable of forming a large floc because the yield of fine fibers can be improved and the surface properties of the base paper can be improved. If the average molecular weight of the cationic flocculant is less than 6 million, the effect of using the cationic flocculant may not be sufficiently exhibited. On the other hand, if the average molecular weight is larger than 16 million, the floc becomes large and the texture is lost. Unevenness due to unevenness of work and unevenness of gloss occurs. On the other hand, if the degree of cationization is less than 0 meq / g, the effect of using the cationic flocculant may not be sufficiently exhibited. Unevenness due to unevenness of work and unevenness of gloss occurs.
Moreover, it is preferable that the addition amount of a cationic flocculant is 0.01%-0.1% in a pure part with respect to a pulp, Furthermore, it is preferable that it is 0.02%-0.05%. If the addition amount of the cationic flocculant is less than 0.01%, the predetermined agglomeration effect may not be sufficiently exhibited. On the other hand, if it exceeds 0.1%, the flocs become large and the texture is lost. Unevenness due to gloss unevenness occurs.
＜アニオン性凝集剤＞
本発明では、上記カチオン性凝結剤、カチオン性凝集剤を添加した後に、アニオン性凝集剤を添加することが好ましい。アニオン性凝集剤を添加することで、カチオン性凝集剤によって発生したフロックを効果的に凝集でき、微細繊維の歩留り向上に伴なう表面性の改善が得られる。アニオン性凝集剤は、従来から歩留り向上剤として使用されてきたものを使用することができる。具体的には、アニオン性ポリアクリルアミド系物質、コロイダルシリカ、ベントナイトが挙げられ、これらの群から選ばれる１種類、または２種類以上を併用しても良い。本発明では、よりパルプスラリーに対する分散性が高く、パルプ同士を結び付けやすいベントナイトが好ましい。
ベントナイトの添加量は、パルプに対して純分で０．１％〜５．０％、さらには０．５％〜３．０％であることが好ましい。ベントナイトの添加量が０．１％未満だと、所定の凝集効果が充分に発現されない恐れがあり、一方５．０％を超えると、凝集効果に偏りが生じて地合いを崩しやすく、塗工ムラや光沢ムラが発生するため好ましくない。
カチオン性凝集剤、アニオン性凝集剤の添加場所としては カチオン性凝集剤をスクリーン前、アニオン性凝集剤をスクリーン後に添加することが好ましい。これは、地合いが悪化しない程度にフロックの形成を抑えつつ、最大限に微細繊維の歩留りを向上させて原紙の表面性を改善するためには、カチオン性凝集剤により大きなフロックを得た後に、スクリーンによるシェアで一旦フロックを分解し、再度、アニオン性凝集剤でフロックを形成することが好ましいためである。
本発明のごとく、古紙パルプを７０％以上に高配合する塗工紙においては、特に微細繊維の歩留りを向上させることで、本発明の目的である高剛度が達成できる。つまり、微細繊維が存在することで、原紙の表面が均一になり塗工ムラが発生し難く、白紙光沢度、印刷光沢度が向上しやすくなり、カレンダー処理におけるニップ圧を軽減できるため、剛度に優れた微塗工紙が得られる。塗工紙の表面性、光沢性を充分に向上させるには、上記のごとく、所定のカチオン性凝結剤、カチオン性凝集剤、アニオン性凝集剤を、所定の割合で組み合わせることが好ましい。
<Anionic flocculant>
In the present invention, it is preferable to add the anionic flocculant after adding the cationic coagulant and the cationic flocculant. By adding an anionic flocculant, flocs generated by the cationic flocculant can be effectively agglomerated, and surface properties can be improved as the yield of fine fibers is improved. As the anionic flocculant, those conventionally used as a yield improver can be used. Specific examples include anionic polyacrylamide-based materials, colloidal silica, and bentonite, and one or two or more types selected from these groups may be used in combination. In the present invention, bentonite that has higher dispersibility with respect to the pulp slurry and easily binds the pulps is preferable.
The addition amount of bentonite is preferably 0.1% to 5.0%, and more preferably 0.5% to 3.0%, pure with respect to the pulp. If the added amount of bentonite is less than 0.1%, the predetermined agglomeration effect may not be sufficiently exhibited. On the other hand, if it exceeds 5.0%, the agglomeration effect is biased and the texture tends to collapse, resulting in uneven coating. Or uneven glossiness is undesirable.
As a location for adding the cationic flocculant and the anionic flocculant, it is preferable to add the cationic flocculant before the screen and the anionic flocculant after the screen. In order to improve the surface properties of the base paper by maximizing the yield of fine fibers while suppressing the formation of flocs to such an extent that the texture does not deteriorate, after obtaining a large floc with a cationic flocculant, This is because it is preferable that the floc is once decomposed by the share of the screen and then the floc is formed again with the anionic flocculant.
As in the present invention, in the coated paper in which the waste paper pulp is highly blended to 70% or more, the high rigidity, which is the object of the present invention, can be achieved particularly by improving the yield of fine fibers. In other words, due to the presence of fine fibers, the surface of the base paper is uniform and coating unevenness is unlikely to occur, the blank paper glossiness and printing glossiness are easily improved, and the nip pressure in the calendar process can be reduced, so that the rigidity is increased. Excellent fine coated paper is obtained. In order to sufficiently improve the surface property and glossiness of the coated paper, it is preferable to combine a predetermined cationic coagulant, a cationic flocculant, and an anionic flocculant in a predetermined ratio as described above.
〔抄紙設備〕
本発明において使用できる抄紙設備としては、特に限定されないが、本発明の目的である、高剛度や嵩高さを得るには、ギャップフォーマからなるワイヤーパート、オープンドローのないストレートスルー型からなるプレスパート、シングルデッキドライヤーからなるドライヤーパートを組み合わせることが好ましい。理由は次の通りである。
＜ワイヤーパート（ヘッドボックス）＞
調製されたパルプスラリーは、ヘッドボックスを経由してワイヤーパートに送られる。ワイヤーパートとしては、長網フォーマや、長網フォーマにオントップフォーマを組み合わせたもの、あるいはツインワイヤーフォーマなど、特に限定されないが、ヘッドボックスから噴出された紙料ジェットを２枚のワイヤーで直ちに挟み込むギャップタイプのギャップフォーマが、両面から脱水するため表裏差が少なく、塗工ムラ、印刷ムラに表裏差が発生し難いため好ましい。
＜プレスパート＞
ワイヤーパートでの紙層は、プレスパートに移行され、さらに脱水が行われる。プレス機としては、ストレートスルー型、インバー型、リバース型のいずれであってもよく、またこれらの組み合わせも使用することができるが、オープンドローを無くしたストレートスルー型が、紙を保持しやすく、断紙などの操業トラブルが少ないため、好ましい。脱水方式としては、通常行われているサクションロール方式やグルーブドプレス方式等の方法を使用することができるが、シュープレスは脱水性と平滑性とを向上できるため、より好ましい。
＜プレドライヤーパート＞
プレスパートを通った湿紙は、シングルデッキ方式のプレドライヤーパートに移行し、乾燥が図られる。プレドライヤーパートは、断紙が少なく、嵩を落とすことなく高効率に乾燥を行える、ノーオープンドロー形式のシングルデッキドライヤーが好ましい。ダブルデッキ方式にて乾燥する方式も可能だが、キャンバスマーク、断紙、シワ、紙継ぎ等の操業性の面で、シングルデッキ方式に劣るため好ましくない。
[Paper making equipment]
The papermaking equipment that can be used in the present invention is not particularly limited, but in order to obtain high rigidity and bulkiness, which is the object of the present invention, a wire part made of a gap former, a press part made of a straight-through type without an open draw. It is preferable to combine a dryer part consisting of a single deck dryer. The reason is as follows.
<Wire part (head box)>
The prepared pulp slurry is sent to the wire part via the head box. The wire part is not particularly limited, such as a long-form former, a combination of a long-form former and an on-top former, or a twin wire former, but the paper jet ejected from the head box is immediately sandwiched between two wires. A gap-type gap former is preferable because there is little difference between the front and back because it dehydrates from both sides, and it is difficult to cause a difference in front and back in uneven coating and printing.
<Press part>
The paper layer in the wire part is transferred to the press part and further dewatered. The press machine can be either a straight-through type, an invar type, or a reverse type, and a combination of these can also be used, but the straight-through type with no open draw is easy to hold the paper, This is preferable because there are few operational troubles such as paper breaks. As the dehydration method, a commonly used method such as a suction roll method or a grooved press method can be used, but a shoe press is more preferable because it can improve dewaterability and smoothness.
<Pre-dryer part>
The wet paper that has passed through the press part is transferred to a single-deck pre-dryer part and dried. The pre-dryer part is preferably a no-open draw type single-deck dryer that has few paper breaks and can be dried efficiently without reducing the bulk. A drying method using a double deck method is also possible, but it is not preferable because it is inferior to a single deck method in terms of operability such as canvas marks, paper breaks, wrinkles, and paper splicing.
〔下塗り塗工〕
以上の原紙には、剛度を向上させる目的で、水溶性高分子をロールコーターを用いて、下塗り塗工する。
水溶性高分子としては、例えば、酸化澱粉、ヒドロキシエチルエーテル化澱粉、酵素変性澱粉、生澱粉などの澱粉またはその誘導体、ポリアクリルアミド、ポリビニルアルコールなどの合成高分子、耐水化や表面強度向上を目的とした紙力増強剤、サイズ性付与を目的とした外添サイズ剤、または一般に表面処理剤として通常使用されるものを単独で、あるいはこれらを数種類混合して使用することができる。これらのうち酸化澱粉が、剛度を向上させつつ、白色度の低下を最小限に抑え、塗工作業性を向上させることができるため特に好ましい。
水溶性高分子として酸化澱粉を用いた場合の塗布量は、特に限定されないが、好ましくは片面あたり０．１〜１．５ｇ／ｍ2、より好ましくは０．２〜１．３ｇ／ｍ2、最も好ましくは、０．３〜１．０ｇ／ｍ2である。０．１ｇ／ｍ2未満では、被覆性が悪く、原紙の剛度を向上させる効果が少ない。１．５ｇ／ｍ2を超えると、剛度は向上するが、澱粉本来の色が塗工紙に現れやすくなり、白色度が低下するだけでなく、塗工液の増加により、ロール表面から塗工液が飛散して、塗工ミストが発生し、欠陥や異物となりやすく、作業性が低下するため好ましくない。
このような水溶性高分子は、例えば、２ロールサイズプレスコーターやゲートロールコーター、ブレードメタリングサイズプレスコーター、ロッドメタリングサイズプレスコーター、又はシムサイザーやＪＦサイザー等のフィルム転写型ロールコーター等の塗工機によって塗布することができる。フィルム転写型ロールコーターは、塗工量が少なくても表面被覆性が高いため、低塗工量でも剛度が高い塗工紙を得られるため好ましい。上記以外の塗工機、例えばブレードコーターやエアーナイフコーターは、低塗工量では被覆性が悪くなり、非塗工部分が生じやすいため好ましくなく、スプレーコーターやカーテンコーターについては、均一な塗工が得られず、光沢ムラとなりやすいため好ましくない。
[Undercoating]
For the purpose of improving the rigidity, the above base paper is undercoated with a water-soluble polymer using a roll coater.
Examples of water-soluble polymers include starches such as oxidized starch, hydroxyethyl etherified starch, enzyme-modified starch and raw starch or derivatives thereof, synthetic polymers such as polyacrylamide and polyvinyl alcohol, and water resistance and surface strength improvement. The paper strength enhancing agent described above, the externally added sizing agent for the purpose of imparting sizing properties, or those commonly used as surface treatment agents can be used alone or in combination. Among these, oxidized starch is particularly preferable because it can improve the workability while minimizing the decrease in whiteness while improving the rigidity.
Coating amount in the case of using the oxidized starch as a water-soluble polymer is not particularly limited, preferably 0.1~1.5g per side / m 2, more preferably 0.2~1.3g / m 2, most preferably from 0.3 to 1.0 g / m 2. If it is less than 0.1 g / m 2 , the coverage is poor and the effect of improving the stiffness of the base paper is small. If it exceeds 1.5 g / m 2 , the stiffness will improve, but the original color of starch will tend to appear on the coated paper, and not only will the whiteness decrease, but the coating liquid will increase and the coating will start from the roll surface. Since the liquid is scattered, coating mist is generated, and defects and foreign matters are easily generated, and workability is deteriorated.
Such a water-soluble polymer is applied to, for example, a two-roll size press coater, a gate roll coater, a blade metering size press coater, a rod metering size press coater, or a film transfer type roll coater such as a shim sizer or a JF sizer. Can be applied by machine tool. The film transfer type roll coater is preferable because it has a high surface coverage even when the coating amount is small, and a coated paper having high rigidity can be obtained even at a low coating amount. Coating machines other than those described above, such as blade coaters and air knife coaters, are unfavorable because the coatability is poor at low coating amounts and non-coated parts are likely to occur, and uniform coating is required for spray coaters and curtain coaters. Cannot be obtained, and gloss unevenness is likely to occur.
〔平坦化処理（プレカレンダー）〕
下塗り塗工後の原紙は、上塗り塗工（顔料塗工）を行う前に、プレカレンダーによる平坦化処理を行うことが好ましい。プレカレンダーは、上側が金属ロールで下側が弾性ロールであるソフトカレンダーが、表面の改良性が高いため好ましい。プレカレンダーは、１段又は必用に応じ２段以上の組合せで行うこともできる。プレカレンダーでの処理により、水溶性高分子塗布後の基紙表面を平坦化処理することができるとともに、後のカレンダーで過度の平坦化処理を要しないことで、紙の緊度を高くすることなく基紙表面の平坦性を向上させることが可能になり、剛度が高くで嵩高な塗工紙を得ることができる。また、基紙表面を平坦化処理することで上塗り塗工の塗工性を向上させ、ミストの発生を抑え、塗工液の塗工ムラを抑えることができる。プレカレンダーの線圧は、好ましくは１０〜８０ＫＮ／ｍであり、より好ましくは１０〜５０ＫＮ／ｍである。１０ＫＮ／ｍ未満であると、水溶性高分子塗布後の基紙の平坦化が進まず、また、８０ＫＮ／ｍを超過すると、必要以上に原紙を圧迫するため、剛度が低下し、緊度が上昇して嵩高さに劣るため好ましくない。
[Flatening treatment (pre-calendar)]
The base paper after the undercoating is preferably subjected to a flattening process using a precalender before the topcoating (pigment coating). As the pre-calender, a soft calender having a metal roll on the upper side and an elastic roll on the lower side is preferable because of its high surface improvement. The pre-calendar can be performed in one stage or a combination of two or more stages as required. By pre-calendar treatment, the surface of the base paper after the application of water-soluble polymer can be flattened, and it is not necessary to excessively flatten the post-calendar to increase the paper tension. Therefore, the flatness of the surface of the base paper can be improved, and a coated paper having high rigidity and high bulk can be obtained. Further, the surface of the base paper is flattened to improve the coating property of the top coating, to suppress the generation of mist, and to suppress the coating unevenness of the coating liquid. The linear pressure of the pre-calender is preferably 10 to 80 KN / m, more preferably 10 to 50 KN / m. If it is less than 10 KN / m, flattening of the base paper after application of the water-soluble polymer will not proceed. If it exceeds 80 KN / m, the base paper will be compressed more than necessary, so that the stiffness will decrease and the tightness will decrease. It is not preferable because it rises and is inferior in bulk.
〔上塗り塗工（顔料塗工）〕
次に、原紙の一方又は双方の面に、顔料及び接着剤を含む塗工液を塗工して塗工層を設ける。顔料は、平均粒子径０．２μｍ以上、アスペクト比が５以上のデラミネーテッドクレーを配合することが好ましい。デラミネーテッドクレーの配合量は、顔料１００質量部に対して１０質量部〜６０質量部、より好ましくは１０〜５０質量部である。本願の目的である、より低塗工量で高白紙光沢度、高印刷光沢度を得るためには、被覆性の高いデラミネーテッドクレーを用いることが好ましい。しかしながら、デラミネーテッドクレーは塗工液での流動性が悪く、６０質量部を超えて配合すると、塗工ムラが発生するため好ましくない。また配合量１０質量部未満では、目的の被覆性が得られず、白紙光沢度、印刷光沢度が低下する。
前述した微細繊維の歩留り向上による表面性の改善効果に加え、顔料塗工としてデラミネーテッドクレーからなる塗工液を塗工することにより、白紙光沢を維持しつつ塗工量を低減でき、紙全体に占めるパルプの割合が上昇し、更なる剛度の改善が得られる。
また、従来は原紙の表面性が悪いと、フィルム転写塗工時に塗料がミスト状になって飛散する問題があり、特に塗料の流動性が悪いデラミネーテッドクレーを配合した場合に、飛散が顕著となっていた。しかし、顔料塗工前に水溶性高分子を塗布することで、原紙の平滑性が向上でき、均一なフィルム転写塗工が可能となるため、ミストの飛散を抑えつつ、デラミネーテッドクレーを配合することが可能となった。加えて、水溶性高分子を塗布することで、上塗り塗工後の平滑性が向上しやすくなり、光沢が出やすくなるため、より塗工量が少なくて済み、パルプ由来の剛度が更に向上できる。一方で、白紙光沢度の向上に伴ない、印刷光沢度についても相乗効果により向上する。
[Top coating (pigment coating)]
Next, a coating layer containing a pigment and an adhesive is applied to one or both sides of the base paper to provide a coating layer. The pigment is preferably blended with a delaminated clay having an average particle size of 0.2 μm or more and an aspect ratio of 5 or more. The blending amount of the delaminated clay is 10 to 60 parts by mass, more preferably 10 to 50 parts by mass with respect to 100 parts by mass of the pigment. In order to obtain high white paper glossiness and high printing glossiness with a lower coating amount, which is the object of the present application, it is preferable to use a delaminated clay having high coverage. However, delaminated clay has poor fluidity in the coating solution, and if it exceeds 60 parts by mass, coating unevenness occurs, which is not preferable. On the other hand, when the blending amount is less than 10 parts by mass, the desired coverage cannot be obtained, and the blank paper glossiness and printing glossiness are lowered.
In addition to the above-mentioned surface property improvement effect by improving the yield of fine fibers, by applying a coating liquid consisting of delaminated clay as a pigment coating, the coating amount can be reduced while maintaining the gloss of white paper. The proportion of pulp in the whole increases, and a further improvement in stiffness is obtained.
Conventionally, if the surface property of the base paper is poor, there is a problem that the paint becomes a mist and scatters during film transfer coating, especially when blended with a delaminated clay with poor paint fluidity. It was. However, by applying a water-soluble polymer before pigment coating, the smoothness of the base paper can be improved and uniform film transfer coating is possible, so delaminated clay is blended while suppressing mist scattering. It became possible to do. In addition, by applying a water-soluble polymer, it becomes easier to improve the smoothness after top coating, and it becomes easier to obtain gloss, so the amount of coating can be reduced and the rigidity derived from pulp can be further improved. . On the other hand, as the glossiness of the white paper is improved, the printing glossiness is also improved by a synergistic effect.
デラミネーテッドクレー以外の顔料として、例えば、カオリン、微粒カオリン、炭酸カルシウム、タルク、サチンホワイト、亜硫酸カルシウム、石膏、硫酸バリウム、ホワイトカーボン、焼成カオリン、構造化カオリン、珪藻土、炭酸マグネシウム、二酸化チタン、水酸化アルミニウム、水酸化カルシウム、水酸化マグネシウム、水酸化亜鉛、酸化亜鉛、酸化マグネシウム、ベントナイト、セリサイト等の無機顔料や、ポリスチレン樹脂微粒子、尿素ホルマリン樹脂微粒子、微小中空粒子、多孔質微粒子等の有機顔料等の中から、一種又は二種以上を適宜選択して配合しても良い。デラミネーテッドクレー以外には、白色度の向上作用が大きい炭酸カルシウム、より好ましくは安価な重質炭酸カルシウムを用いることができる。
低ニップで高白紙光沢度を発現させる有機顔料は、カレンダーのニップ圧を軽減させるために配合することができるが、塗工ムラが発生しやすくなる。本発明は有機顔料を用いずに、目的の高剛度や嵩高さ、高白紙光沢度、高印刷光沢度を得る方法であるため、配合しなくても良い。
As pigments other than delaminated clay, for example, kaolin, fine kaolin, calcium carbonate, talc, satin white, calcium sulfite, gypsum, barium sulfate, white carbon, calcined kaolin, structured kaolin, diatomaceous earth, magnesium carbonate, titanium dioxide, Inorganic pigments such as aluminum hydroxide, calcium hydroxide, magnesium hydroxide, zinc hydroxide, zinc oxide, magnesium oxide, bentonite, sericite, polystyrene resin fine particles, urea formalin resin fine particles, fine hollow particles, porous fine particles, etc. One or two or more organic pigments may be appropriately selected and blended. In addition to the delaminated clay, calcium carbonate having a large whiteness improving effect, more preferably inexpensive heavy calcium carbonate can be used.
An organic pigment that exhibits high white paper glossiness at a low nip can be blended to reduce the nip pressure of the calendar, but coating unevenness tends to occur. Since the present invention is a method for obtaining the desired high rigidity, bulkiness, high white paper glossiness, and high printing glossiness without using an organic pigment, it does not need to be blended.
以上の顔料とともに塗工液に配合される接着剤の種類は特に限定がないが、例えば、カゼイン、大豆蛋白等の蛋白質類；スチレン−ブタジエン共重合体ラテックス、メチルメタクリレート−ブタジエン共重合体ラテックス、スチレン−メチルメタクリレート−ブタジエン共重合体ラテックス等の共役ジエン系ラテックス、アクリル酸エステル及び／又はメタクリル酸エステルの重合体ラテックス若しくは共重合体ラテックス等のアクリル系ラテックス、エチレン−酢酸ビニル重合体ラテックス等のビニル系ラテックス、あるいはこれらの各種共重合体ラテックスをカルボキシル基等の官能基含有単量体で変性したアルカリ部分溶解性又は非溶解性のラテックス等のラテックス類；ポリビニルアルコール、オレフィン−無水マレイン酸樹脂、メラミン樹脂、尿素樹脂、ウレタン樹脂等の合成樹脂系接着剤；酸化澱粉、陽性化澱粉、エステル化澱粉、デキストリン等の澱粉類；カルボキシメチルセルロース、ヒドロキシエチルセルロース等のセルロース誘導体等の、通常ダル調塗工紙に用いられる接着剤が挙げられ、これらの中から一種又は二種以上を適宜選択して使用することができる。 There are no particular limitations on the type of adhesive blended in the coating solution together with the above pigments, for example, proteins such as casein and soybean protein; styrene-butadiene copolymer latex, methyl methacrylate-butadiene copolymer latex, Conjugated diene latex such as styrene-methyl methacrylate-butadiene copolymer latex, acrylic latex such as polymer latex or copolymer latex of acrylate ester and / or methacrylate ester, ethylene-vinyl acetate polymer latex, etc. Latex compounds such as alkali partially soluble or non-soluble latex obtained by modifying vinyl-based latex or various copolymer latexes thereof with a functional group-containing monomer such as carboxyl group; polyvinyl alcohol, olefin-maleic anhydride resin , Me Synthetic resin adhesives such as min resin, urea resin, urethane resin; starches such as oxidized starch, positive starch, esterified starch, dextrin; cellulose derivatives such as carboxymethyl cellulose, hydroxyethyl cellulose, etc. Adhesives used for paper can be mentioned, and one or two or more of these can be appropriately selected and used.
塗工剤中の顔料と接着剤との割合には特に限定がないが、好ましくは顔料１００質量部に対して接着剤が固形分比で３〜１７質量部であり、より好ましくは５〜１５質量部である。接着剤の量が３質量部未満では、塗工層の形成性が低下し、表面強度が低下する。他方、１７質量部を超えると、接着剤の量が多すぎて、顔料由来の光沢性が発現しにくく、白紙光沢度が低下する。
さらに本塗工液には、例えば、蛍光増白剤や蛍光増白剤の定着剤、消泡剤、離型剤、着色剤、保水剤等の、通常使用される各種助剤を適宜配合することもできる。
原紙への上塗り層（顔料塗工層）の塗工は、例えば、複数段階、通常はプレドライヤーパートとアフタードライヤーパートとの２段階で行われるドライヤーパートの間のコーターパートにおいて行われることが好ましい。このコーターパートにおいても、下塗り塗工と同様に、例えば、２ロールサイズプレスコーターやゲートロールコーター、ブレードメタリングサイズプレスコーター、ロッドメタリングサイズプレスコーター、又はシムサイザーやＪＦサイザー等のフィルム転写型ロールコーター等の塗工機によって塗布することができる。フィルム転写型ロールコーターは、低塗工量でも表面被覆性と剛度が高い塗工紙を得られるため好ましい。上記以外の塗工機、例えばブレードコーターやエアーナイフコーターは、低塗工量での塗工ができないため好ましくなく、スプレーコーターやカーテンコーターは、低塗工量での塗工は可能だが均一な塗工面が得られないため、光沢ムラが発生しやすくなり好ましくない。
Although there is no limitation in particular in the ratio of the pigment in a coating agent, and an adhesive agent, Preferably an adhesive agent is 3-17 mass parts by solid content ratio with respect to 100 mass parts of pigments, More preferably, it is 5-15. Part by mass. When the amount of the adhesive is less than 3 parts by mass, the formability of the coating layer is lowered and the surface strength is lowered. On the other hand, when the amount exceeds 17 parts by mass, the amount of the adhesive is too large, and the gloss derived from the pigment is hardly exhibited, and the glossiness of the white paper is lowered.
Furthermore, for example, various commonly used auxiliaries such as a fluorescent brightening agent, a fluorescent brightening agent fixing agent, an antifoaming agent, a release agent, a coloring agent, and a water retention agent are appropriately blended in the coating liquid. You can also
The coating of the top coat layer (pigment coating layer) on the base paper is preferably performed, for example, in a coater part between dryer parts which is performed in a plurality of stages, usually two stages of a pre-dryer part and an after-dryer part. . In this coater part, as in the case of undercoat coating, for example, a film transfer type roll such as a 2-roll size press coater, a gate roll coater, a blade metering size press coater, a rod metering size press coater, or a shim sizer or JF sizer. It can apply | coat with coating machines, such as a coater. A film transfer type roll coater is preferable because a coated paper having high surface coverage and high rigidity can be obtained even with a low coating amount. Coating machines other than the above, such as blade coaters and air knife coaters, are not preferred because they cannot be applied at low coating amounts, and spray coaters and curtain coaters can be applied at low coating amounts but are uniform. Since a coated surface cannot be obtained, gloss unevenness tends to occur, which is not preferable.
前述した微細繊維の歩留り向上とデラミネーテッドクレーによる表面性の改善効果に加えて、フィルム転写塗工を行うことで得られる均一な顔料塗工層による表面性の改善を組み合わせると、相乗効果により、白紙光沢が向上するだけでなく、印刷時のインキ吸収性を均一にでき、均一なインキ被膜が形成されるため、得られる印刷物は印刷光沢度が７０％以上、更には７５％以上まで向上させることができる。上記組み合わせにより微塗工紙を製造することで、米坪が６０ｇ／ｍ2以下と軽量でありながら高剛度であり、塗工量が片面あたり１０ｇ／ｍ2以下と低塗工量でありながら白色度、白紙光沢度、印刷光沢度に優れた微塗工紙が得られる。
塗工装置はまた、抄紙機と一体なったオンマシンコーターを用いると、オフマシンコーターに比べて、より高温の原紙に塗工でき、さらなる白紙光沢度、印刷光沢度の向上が図れるため好ましい。なお、ドライヤーパートでの乾燥方法としては、例えば、熱風加熱、ガスヒーター加熱、赤外線ヒーター加熱等の各種加熱乾燥方式を適宜採用することができる。
原紙への塗工液の塗工量は、片面あたり、好ましくは２．９ｇ／ｍ2〜９．９ｇ／ｍ2、より好ましくは５．０ｇ／ｍ2〜９．５ｇ／ｍ2、最も好ましくは、６．０ｇ／ｍ2〜９．０ｇ／ｍ2である。塗工液の量が片面あたり２．９ｇ／ｍ2未満では、用紙表面に未塗工部分が生じ易く、白紙光沢度の低下や印刷光沢のムラが生じる恐れがある。片面あたり９．９ｇ／ｍ2以上塗工すると、原紙よりも顔料塗工層の密度が高いため、得られる塗工紙の重量と緊度が増加し、嵩高な塗工紙が得られない。
In addition to the above-mentioned improvement in the yield of fine fibers and the improvement in surface properties due to the delaminated clay, combining the improvement in surface properties due to the uniform pigment coating layer obtained by film transfer coating results in a synergistic effect. In addition to improving the glossiness of blank paper, the ink absorbability during printing can be made uniform and a uniform ink film is formed, so the printed matter obtained has a glossiness of 70% or higher, and further improved to 75% or higher. Can be made. By producing a finely coated paper by the above combination, while the weight per square meter is 60 g / m 2 or less and lightweight, it is highly rigid, while the coating amount is 10 g / m 2 or less per side and the coating amount is low. A finely coated paper having excellent whiteness, white paper gloss and printing gloss can be obtained.
In addition, it is preferable to use an on-machine coater integrated with a paper machine because the coating apparatus can be applied to a higher temperature base paper and can further improve the white paper glossiness and printing glossiness as compared to the off-machine coater. In addition, as a drying method in the dryer part, for example, various heating drying methods such as hot air heating, gas heater heating, and infrared heater heating can be appropriately employed.
The coating amount of the coating liquid on the base paper is preferably 2.9 g / m 2 to 9.9 g / m 2 , more preferably 5.0 g / m 2 to 9.5 g / m 2 , most preferably per one side. is 6.0g / m 2 ~9.0g / m 2 . If the amount of the coating liquid is less than 2.9 g / m 2 per side, an uncoated part is likely to occur on the paper surface, and there is a risk that the glossiness of the white paper will be lowered or the printing gloss will be uneven. When 9.9 g / m 2 or more is applied per side, since the density of the pigment coating layer is higher than that of the base paper, the weight and tightness of the resulting coated paper increase, and a bulky coated paper cannot be obtained.
〔カレンダーパート〕
塗工層に光沢性や平坦性、印刷適性を付与する目的で、少なくとも一方が熱ロールとされた一対のロール、好ましくは弾性ロール及び金属ロール間に通紙して平坦化処理を施すことが好ましい。一般に平坦化処理は、弾性ロールと金属ロールとの間に塗工紙を通し、塗工紙に高ニップ圧をかけて摩擦力により塗工紙表面を磨き、光沢性を付与するものであり、ニップ圧で紙を潰すため、紙の剛度と嵩高さが損なわれると共に、塗工紙の微細な凸部にニップ圧と摩擦力が集中し、繊維焼けが発生したり、熱と圧力により、塗工紙自体が黄変化したりする、退色の問題があった。この問題を回避するため、カレンダーの線圧は、１００〜６００ＫＮ／ｍが好ましく、１００〜４００ＫＮ／ｍがより好ましい。１００ＫＮ／ｍ未満であると、顔料塗工層の平坦化が進まず、また、６００ＫＮ／ｍを超過すると、必要以上に原紙を圧迫するため、剛度が低下し、緊度が上昇するため好ましくない。金属ロールの温度は、１００〜３００℃が好ましく、１００〜２００℃がより好ましい。１００℃未満であると、顔料塗工層の平坦化が進まず、また、３００℃を超過すると、繊維焼けが発生したり、熱と圧力により、塗工紙自体が黄変化したりする、退色が発生するため好ましくない。
カレンダー設備としては、スーパーカレンダーやソフトカレンダー等の平坦化設備を用いることができる。中でも、マルチニップカレンダー、より望ましくは６段、８段、１０段のマルチニップカレンダーが、ニップ圧を調整しやすく、剛度や白紙光沢度を調整しやすいため最適である。また、カレンダーの設置場所としては、抄紙機及び塗工機と一体になったオンマシンタイプが好ましい。オンマシンタイプでは、塗工後すぐ、紙面温度が高い状態で平坦化処理できるため、白紙光沢度が向上しやすく、目的の塗工紙が得られやすい。
[Calendar part]
For the purpose of imparting glossiness, flatness, and printability to the coating layer, a pair of rolls, at least one of which is a hot roll, preferably a paper is passed between an elastic roll and a metal roll to perform a flattening treatment. preferable. In general, in the flattening treatment, a coated paper is passed between an elastic roll and a metal roll, a high nip pressure is applied to the coated paper, the coated paper surface is polished by frictional force, and gloss is imparted. Since the paper is crushed by the nip pressure, the stiffness and bulkiness of the paper are impaired, and the nip pressure and frictional force are concentrated on the fine convex portions of the coated paper, causing fiber scorching, and heat and pressure. There was a problem of fading, such as the paper itself turning yellow. In order to avoid this problem, the linear pressure of the calendar is preferably 100 to 600 KN / m, and more preferably 100 to 400 KN / m. If it is less than 100 KN / m, the pigment coating layer will not be flattened. If it exceeds 600 KN / m, the base paper will be compressed more than necessary, so that the rigidity will decrease and the tightness will increase. . 100-300 degreeC is preferable and the temperature of a metal roll has more preferable 100-200 degreeC. When the temperature is less than 100 ° C, the pigment coating layer does not flatten, and when the temperature exceeds 300 ° C, fiber burns occur, or the coated paper itself turns yellow due to heat and pressure. Is not preferable.
As the calendar facility, a flattening facility such as a super calendar or a soft calendar can be used. Among them, a multi-nip calender, more preferably a 6-, 8-, or 10-stage multi-nip calender is optimal because it is easy to adjust the nip pressure and the rigidity and white paper gloss. Moreover, as an installation place of a calendar, an on-machine type integrated with a paper machine and a coating machine is preferable. In the on-machine type, flattening can be performed immediately after coating at a high paper surface temperature, so that the glossiness of blank paper is easily improved and the desired coated paper is easily obtained.
次に、本発明の微塗工紙を実施例に基づいてさらに詳細に説明するが、本発明はこれら実施例のみに限定されるものではない。
〔実施例１〜２９、比較例１〜２０〕
まず、原料パルプとして、ＬＢＫＰ、ＮＢＫＰ及び雑誌古紙から生産したＭＤＩＰを５：２５：７０の割合（質量比）で混合し、このパルプ１００質量部（絶乾量）に対して、各々固形分で、軽質炭酸カルシウム（品番：ＴＰ−１２１−６Ｓ、奥多摩工業（株）製）１０％、カチオン化澱粉（品番：アミロファックスＴ−２６００、アベベジャパン（株）製）３％、カチオン性凝結剤（品番：カチオファストＳＦ、ＢＡＳＦ（株）製）０．２％、カチオン性凝集剤（品番：パーコールＥ２４Ｘ、チバ・スペシャリティ・ケミカル（株）製）０．０３％、アニオン性凝集剤（品番：ベントナイト、チバ・スペシャリティ・ケミカル（株）製）２．０％を添加してパルプスラリーを得た。但し、比較例１８はカチオン性凝結剤を配合せず、比較例１９はカチオン性凝集剤を配合せず、比較例２０はアニオン性凝集剤を配合しなかった。
次に、ワイヤーパート、プレスパート、プレドライヤーパートを経て紙匹を製造した後、この両面に澱粉塗液を表１及び表２に記載の塗工量で下塗り塗工した。この下塗り塗工後、アフタードライヤーパートで乾燥し、プレカレンダーパートで、表１及び表２に記載のニップ圧で平坦化処理を行った。次いで、コーターパートにて、表１及び表２に記載の条件で調製した顔料及び接着剤（顔料１００質量部に対し、１０質量部）を含む塗工液を、表１及び表２に記載の塗工量となるよう、表１及び表２に記載した設置場所および設備で、原紙の両面に塗工した。
Next, although the fine coated paper of this invention is demonstrated still in detail based on an Example, this invention is not limited only to these Examples.
[Examples 1 to 29, Comparative Examples 1 to 20]
First, as raw material pulp, MDIP produced from LBKP, NBKP and magazine waste paper is mixed at a ratio (mass ratio) of 5:25:70, and each 100 parts by mass (absolute dry amount) of this pulp is solid content. , Light calcium carbonate (product number: TP-121-6S, manufactured by Okutama Kogyo Co., Ltd.) 10%, cationized starch (product number: Amilofax T-2600, manufactured by Abebe Japan Co., Ltd.) 3%, cationic coagulant ( Product number: Cassiofast SF, manufactured by BASF Co., Ltd.) 0.2%, Cationic flocculant (Product number: Percoll E24X, manufactured by Ciba Specialty Chemicals Co., Ltd.) 0.03%, Anionic flocculant (Product number: Bentonite) Ciba Specialty Chemicals Co., Ltd.) 2.0% was added to obtain a pulp slurry. However, Comparative Example 18 did not contain a cationic coagulant, Comparative Example 19 did not contain a cationic flocculant, and Comparative Example 20 did not contain an anionic flocculant.
Next, after a paper sheet was manufactured through a wire part, a press part, and a pre-dryer part, a starch coating solution was applied to the both surfaces with a coating amount described in Tables 1 and 2 under the coating conditions. After this undercoating, the film was dried by an after dryer part, and a pre-calender part was subjected to a flattening treatment at a nip pressure described in Tables 1 and 2. Next, in the coater part, coating solutions containing pigments and adhesives (10 parts by mass with respect to 100 parts by mass of pigment) prepared under the conditions described in Tables 1 and 2 are listed in Tables 1 and 2. Coating was performed on both sides of the base paper with the installation locations and equipment described in Tables 1 and 2 so that the coating amount was reached.
顔料及び接着剤の詳細は、次の通りである。
（顔料）
・微粒カオリンクレー（品番：ＡＭＡＺＯＮ、カダム社製）
・デラミネーテッドカオリンクレー（品番：カピムＤＧ、（株）イメリス ミネラルズ・ジャパン製、アスペクト比１１）
・湿式重質炭酸カルシウム（品番：エスカロン＃９０、三共製粉（株）製）
（接着剤）
・スチレン−ブタジエンラテックス（品番：ＰＡ５０３６、日本エイアンドエル（株）製）
Details of the pigment and the adhesive are as follows.
(Pigment)
・ Fine granulated kaolin clay (Product number: AMAZON, manufactured by Kadam)
・ Delaminated kaolin clay (Product number: Capim DG, manufactured by Imerizu Minerals Japan, aspect ratio 11)
・ Wet heavy calcium carbonate (Part No .: Escalon # 90, Sankyo Flour Milling Co., Ltd.)
(adhesive)
・ Styrene-butadiene latex (Part No .: PA5036, manufactured by Nippon A & L Co., Ltd.)
次に、両面に塗工層が形成された原紙をアフタードライヤーパートに供して塗工層を乾燥させ、カレンダーパートにて表１に示すカレンダー条件で平坦化処理を施した。その後、リールパート、ワインダーパートに供して塗工紙を得た。
なお、ワイヤーパートではギャップフォーマを、プレスパートではオープンドローのないストレートスルー型を、ドライヤーパートではシングルデッキドライヤーを用いて抄紙した。コーターパートでは、フィルム転写型ロールコーターで下塗り塗工した後、プレカレンダーで平坦化処理し、フィルム転写型ロールコーターで上塗り塗工した。また、カレンダーパートでは、マルチニップカレンダーを用いて平坦化処理を行った。
Next, the base paper with the coating layer formed on both sides was applied to an after dryer part to dry the coating layer, and the calendar part was subjected to flattening treatment under the calendar conditions shown in Table 1. Then, it was used for the reel part and the winder part to obtain coated paper.
Paper was made using a gap former for the wire part, a straight-through type without an open draw for the press part, and a single deck dryer for the dryer part. In the coater part, after undercoating with a film transfer type roll coater, it was flattened with a pre-calender and overcoated with a film transfer type roll coater. In the calendar part, a flattening process was performed using a multi-nip calendar.
得られた塗工紙について、各物性を以下の方法にて調べた。結果は、表１および表２に示す。
（ａ）米坪
ＪＩＳ Ｐ ８１２４：１９９８「紙及び板紙‐坪量測定方法」に記載の方法に準拠して測定した。
（ｂ）紙厚及び密度（緊度）
ＪＩＳ Ｐ ８１１８：１９９８「紙及び板紙‐厚さ及び密度の試験方法」に記載の方法に準拠して測定した。
（ｃ）剛度
ＪＩＳ Ｐ ８１４３：２０００「紙のクラークこわさ試験機によるこわさ試験方法」に記載の方法に準拠して、紙の縦方向および横方向について測定した。
（ｄ）比こわさ
次の式を用いて算出した。
比こわさ（ｍ2／ｇ）＝（剛度（縦）×剛度（横））1/2 ÷ 米坪
（ｅ）白色度
カラーアナライザー（型番：ＭＳ−２０２０ＰＬＵＳ、マクベスグレタグ社製）にて測定した。測定条件はＵＶＩＮ（紫外線を含む）、ＳＣＩ（反射光を含む）、Ｃ光源、視野角２°。
（ｆ）白紙光沢度
ＪＩＳ Ｐ ８１４２：２００５「紙及び板紙‐７５度鏡面光沢度の測定方法」に記載の方法に準拠して測定した。
（ｇ）印刷光沢度
次の条件で印刷試験体を調製し、白紙光沢度と同じ方法で光沢度を測定して、印刷光沢度とした。
印刷機 ：ＲＩ‐３型、株式会社明製作所社製
インキ ：ＷｅｂＲｅｘ Ｎｏｕｖｅｒ ＨＩＭＡＲＫプロセス藍、大日精化株式会社製
インキ量：上段ロールに０．３ｍｌ、下段ロールに０．２ｍｌ
試験方法：上段、下段ロールでそれぞれインキを各３分間練り（２分間練った後、ロールを反転させ更に１分間練る）、回転速度３０ｒｐｍで２色同時印刷を行った。
（ｈ）操業性
塗工ムラを以下の評価基準に基づいて評価した。
◎：塗工ムラが発生せず、安定して塗工できた
○：塗工ムラが若干発生したが、比較的安定して塗工できた。
△：塗工ムラが多少発生し、安定した塗工が得られなかった。
×：塗工ムラが発生し、塗工が安定しなかった。
なお、前記評価基準のうち、◎、○、△を実使用可能と判断する。
About the obtained coated paper, each physical property was investigated with the following method. The results are shown in Tables 1 and 2.
(A) US tsubo Measured according to the method described in JIS P 8124: 1998 “Paper and paperboard—Method for measuring basis weight”.
(B) Paper thickness and density (strength)
Measured according to the method described in JIS P 8118: 1998 “Paper and paperboard—Test methods for thickness and density”.
(C) Stiffness The longitudinal and lateral directions of the paper were measured in accordance with the method described in JIS P 8143: 2000 “A stiffness test method using a paper Clark stiffness tester”.
(D) Specific stiffness Calculated using the following equation.
Specific stiffness (m 2 / g) = (rigidity (longitudinal) × rigidity (horizontal)) 1/2 ÷ tsubo (e) whiteness Measured with a color analyzer (model number: MS-2020PLUS, manufactured by Macbeth Gretag). Measurement conditions are UVIN (including ultraviolet rays), SCI (including reflected light), C light source, viewing angle 2 °.
(F) White paper glossiness Measured according to the method described in JIS P 8142: 2005 “Paper and paperboard—Measurement method of 75 ° specular gloss”.
(G) Print Glossiness A print test specimen was prepared under the following conditions, and the glossiness was measured by the same method as the blank paper glossiness to obtain the print glossiness.
Printing machine: RI-3 type, manufactured by Meiko Seisakusho Co., Ltd. Ink: WebRex Nouver HIMARK process indigo, manufactured by Dainichi Seika Co., Ltd. Ink amount: 0.3 ml for the upper roll and 0.2 ml for the lower roll
Test method: The ink was kneaded for 3 minutes each with the upper and lower rolls (kneaded for 2 minutes, then the roll was inverted and further kneaded for 1 minute), and two-color simultaneous printing was performed at a rotation speed of 30 rpm.
(H) Operability The coating unevenness was evaluated based on the following evaluation criteria.
A: Coating unevenness did not occur and coating could be performed stably. ○: Coating unevenness occurred slightly, but coating could be performed relatively stably.
Δ: Some coating unevenness occurred, and a stable coating could not be obtained.
X: Coating unevenness occurred and coating was not stable.
Of the evaluation criteria, ◎, ○, and Δ are judged to be actually usable.
実施例１〜２９の塗工紙はいずれも、比こわさが０．２５ｍ2／ｇ〜０．４５ｍ2／ｇと高く、緊度が１．０ｇ／ｃｍ3〜１．２ｇ／ｃｍ3と嵩高でありながら、所定の白色度、白紙光沢度（３０〜６０％）、印刷光沢度を有しており、かつ、操業性の良好な、優れた塗工紙である。
これに対して、比較例１〜２０の塗工紙は、塗工方法や塗工量が実施例のように特定されていないため、比こわさ、緊度、白色度、白紙光沢度、印刷光沢度、作業性のいずれかが悪い塗工紙である。
Both coated papers of Examples 1-29, high specific stiffness is a 0.25m 2 /g~0.45m 2 / g, bulk density is the 1.0g / cm 3 ~1.2g / cm 3 bulky However, it is an excellent coated paper having predetermined whiteness, white paper gloss (30 to 60%), and print gloss, and good operability.
On the other hand, the coated papers of Comparative Examples 1 to 20 are not specified with respect to the coating method and the coating amount as in the examples, so the specific stiffness, tightness, whiteness, white paper gloss, printing gloss The coated paper is bad in either degree or workability.
本発明の微塗工紙は、嵩高であるため省資源、コスト削減や、ボリューム感、高級感があり、かつ、高剛度を有するため、高速印刷や自動制御、紙の搬送で問題が発生せず、また、白色度、白紙光沢度、印刷光沢度に優れているため美粧性が高く、例えば、チラシや雑誌、パンフレット等の商業印刷に好適に利用することができる。 Since the finely coated paper of the present invention is bulky, it has resource saving, cost reduction, volume feeling, high-class feeling and high rigidity, so that there are no problems in high-speed printing, automatic control, and paper conveyance. In addition, since it is excellent in whiteness, white paper glossiness, and printing glossiness, it has high cosmetics and can be suitably used for commercial printing such as flyers, magazines, and brochures.
Claims (4)
酸化澱粉を主成分とする塗料を片面あたり０．１ｇ／ｍ2〜１．０ｇ／ｍ2で塗布し、
前記酸化澱粉の塗布後に線圧１０〜５０ＫＮ／ｍでカレンダー処理を行い、
顔料とバインダーを主成分とする少なくとも１層の顔料塗工層をフィルム転写型ロールコーターで片面あたり６．０ｇ／ｍ2〜９．５ｇ／ｍ2塗布し、
さらに金属ロール温度１００℃以上、線圧１００〜６００ｋＮ／ｍでカレンダー処理し、
これら酸化澱粉塗工、カレンダー処理、顔料塗工、カレンダー処理をこの順にオンマシンで行う微塗工紙の製造方法であって、
前記基紙の原料パルプに占める古紙パルプの質量割合が７０％以上であり、
パルプスラリーに、カチオン性凝結剤、カチオン性凝集剤をスクリーン前、アニオン性凝集剤をスクリーン後に添加し、
前記アニオン性凝集剤がベントナイトまたはコロイダルシリカであり、
前記顔料に、平均粒子径０．４μｍ〜０．８μｍ、アスペクト比が５以上のデラミネーテッドクレーを顔料１００質量部に対して１０〜５０質量部含有させ、
前記デラミネーテッドクレー以外のクレーを顔料１００質量部に対して１０〜５０質量部含有させ、
酸化澱粉と顔料塗工層の合計が片面あたり５．１ｇ／ｍ2〜１０ｇ／ｍ2とし、
緊度が１．０ｇ／ｃｍ3〜１．２ｇ／ｃｍ3、 かつ、次の式により導く比こわさが０．２５ｍ2／ｇ〜０．４ｍ2／ｇ、ＪＩＳ Ｐ ８１４２による白紙光沢度が３０〜６０％、米坪が６０ｇ／ｍ2以下である微塗工紙を得ることを特徴とする微塗工紙の製造方法。
比こわさ（ｍ2／ｇ）＝（剛度（縦）× 剛度（横））1/2 ÷ 米坪 On at least one side of the base paper,
A coating mainly composed of oxidized starch is applied at a rate of 0.1 g / m 2 to 1.0 g / m 2 per side ,
After application of the oxidized starch , calendar treatment is performed at a linear pressure of 10 to 50 KN / m,
At least one pigment coating layer mainly composed of a pigment and a binder is applied with a film transfer type roll coater to 6.0 g / m 2 to 9.5 g / m 2 per side ,
Furthermore, it is calendered at a metal roll temperature of 100 ° C. or higher and a linear pressure of 100 to 600 kN / m,
These oxidized starch coating, calendering, pigment coating, and calendering in this order are on-machine manufacturing methods for finely coated paper,
The weight ratio of waste paper pulp to the raw material pulp of the base paper is 70% or more,
Add a cationic coagulant and a cationic flocculant to the pulp slurry before the screen and an anionic flocculant after the screen.
The anionic flocculant is bentonite or colloidal silica;
The pigment contains 10 to 50 parts by mass of delaminated clay having an average particle diameter of 0.4 to 0.8 μm and an aspect ratio of 5 or more with respect to 100 parts by mass of the pigment,
10 to 50 parts by mass of clay other than the delaminated clay is contained with respect to 100 parts by mass of the pigment,
Total oxidized starch and pigment coating layer and per side 5.1g / m 2 ~10g / m 2 ,
Bulk density is 1.0g / cm 3 ~1.2g / cm 3 and a ratio stiffness to lead the following expression is 0.25m 2 /g~0.4m 2 / g, the white paper gloss according to JIS P 8142 30 A method for producing finely coated paper, comprising obtaining finely coated paper having -60% and a basis weight of 60 g / m 2 or less.
Specific stiffness (m 2 / g) = (Stiffness (length) × Stiffness (width)) 1/2 ÷ US tsubo
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