JP2005164308A - Method of determining quality of coated paper - Google Patents
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- JP2005164308A JP2005164308A JP2003400975A JP2003400975A JP2005164308A JP 2005164308 A JP2005164308 A JP 2005164308A JP 2003400975 A JP2003400975 A JP 2003400975A JP 2003400975 A JP2003400975 A JP 2003400975A JP 2005164308 A JP2005164308 A JP 2005164308A
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Abstract
Description
本発明は、印刷用塗工紙の紙質の判定方法に関し、さらに詳しくは印刷後の印刷品質を印刷前に予測し得る印刷用塗工紙の紙質の判定方法に関する。 The present invention relates to a method for determining the quality of a coated paper for printing, and more particularly to a method for determining the quality of a coated paper for printing that can predict the print quality after printing before printing.
従来、各種印刷用紙として多くの紙が使用されている。これらの紙において、写真調の精細な印刷を施すために、紙基材の面に白色顔料などを含む塗工液を塗工して紙の表面を平滑にした各種塗工紙、例えば、アート紙、コート紙、微塗工紙などが使用されている。上記塗工紙に写真原稿を再現して高精細な写真調印刷を形成するためには、高性能な印刷機、印刷版および印刷インキが要求されるとともに、被印刷体である塗工紙にも高品質が要求されている（特許文献１および２）。 Conventionally, many papers are used as various printing papers. In these papers, various types of coated papers, for example, art, in which a coating liquid containing a white pigment or the like is applied to the surface of a paper base to smooth the surface of the paper in order to perform photographic tone printing. Paper, coated paper, finely coated paper, etc. are used. In order to reproduce a photographic manuscript on the coated paper to form a high-definition photographic print, a high-performance printing machine, printing plate, and printing ink are required. High quality is also required (Patent Documents 1 and 2).
以上のように高精細な印刷を行なうためには、上記の如き全ての条件を満たす必要があるが、塗工紙の技術分野と印刷機の技術分野と印刷インキの技術分野とがそれぞれ異なることから、塗工紙と印刷機（印刷版を含む）と印刷インキとの組み合わせにおいてミスマッチがたびたび生じている。すなわち、印刷機および印刷インキが完璧であって実際に印刷を行なった場合には微妙な印刷むらが発生することがあり、これらの印刷むらの発生を印刷前に予測することが困難であった。 In order to perform high-definition printing as described above, it is necessary to satisfy all of the above conditions. However, the technical field of coated paper, the technical field of the printing press, and the technical field of printing ink are different. Therefore, mismatches frequently occur in the combination of coated paper, printing press (including printing plate) and printing ink. That is, when the printing press and printing ink are perfect and printing is actually performed, subtle uneven printing may occur, and it is difficult to predict the occurrence of such uneven printing before printing. .
従って本発明の目的は、印刷用塗工紙、印刷機および印刷インキが個々には全て完璧であっても、それらの組み合わせによって生じる印刷むらを、実際の印刷前に予測可能な塗工紙の紙質の判定方法を提供することである。 Therefore, the object of the present invention is to provide a coating paper whose printing unevenness caused by a combination of printing paper, printing press and printing ink can be predicted before actual printing. It is to provide a paper quality determination method.
上記目的は以下の本発明によって達成される。すなわち、本発明は、印刷用の塗工紙の一方の面を、色素水溶液の表面に均一に接触させた後、上記塗工紙の他方の面に浸出した前記色素の着色斑を観察することを特徴とする塗工紙の紙質の判定方法を提供する。 The above object is achieved by the present invention described below. That is, the present invention observes the colored spots of the dye leached on the other surface of the coated paper after uniformly contacting one surface of the coated paper for printing with the surface of the aqueous dye solution. There is provided a method for judging the quality of coated paper characterized by the above.
上記本発明においては、前記色素が、セルロース繊維に対して親和性を有さない染料であること；印刷用の塗工紙の一方の面を、色素水溶液の表面に均一に接触させる時間が、上記塗工紙の他方の面に色素水溶液による着色斑が目視されるまでの時間であること；および前記着色斑の記録を写真撮影で行なうことが好ましい。 In the present invention, the pigment is a dye that does not have an affinity for cellulose fibers; the time for uniformly contacting one surface of the coated paper for printing with the surface of the pigment aqueous solution, It is preferable that the time until the colored spots due to the aqueous dye solution are visually observed on the other surface of the coated paper; and recording the colored spots by photography.
本発明によれば、印刷用塗工紙、印刷機および印刷インキが個々には全て完璧であってもそれらの組み合わせによって生じる印刷むらを、実際の印刷前に予測可能な塗工紙の紙質の判定方法を提供することができる。この判定方法を用いることにより、印刷業者は顧客に対して予め微妙な印刷むらが発生する可能性があることを知らせることができるので、印刷業者と顧客との間のトラブルを未然に防止することができる。 According to the present invention, even if printing coated paper, printing press and printing ink are all perfect individually, the printing unevenness caused by the combination of them can be predicted before actual printing. A determination method can be provided. By using this judgment method, the printer can inform the customer that there may be subtle uneven printing in advance, so that troubles between the printer and the customer can be prevented in advance. Can do.
次に好ましい実施の形態を挙げて本発明をさらに詳しく説明する。
図１は、塗工紙の断面を強調して表わしたものである。塗工紙１は、紙基材２の少なくとも一方の面に顔料を含む塗工液を塗布および乾燥して塗工層３を形成し、必要に応じて表面平滑化処理を施して構成されている。紙基材２は周知のように各種パルプ繊維を適当なサイジング剤により一定の厚さに抄造されているが、抄紙に際してパルプ繊維の厚さおよび密度が無秩序に変化している。この変化が所謂普通紙感を生じている。このような普通紙に印刷することは勿論可能であるが、紙面を構成している繊維からなる無数の微小凹凸形状のために写真調の高精細な印刷はできない。そのために写真画像を紙面に印刷によって再現するために、上記塗工層を設けて紙基材の表面凹凸を解消しかつ白度を向上させている。本発明における塗工紙とは紙基材の表面に顔料層を設けたものであればよく、例えば、アート紙、コート紙、微塗工紙などの何れの塗工紙でもよい。
Next, the present invention will be described in more detail with reference to preferred embodiments.
FIG. 1 shows a cross section of coated paper with emphasis. The coated paper 1 is configured by applying and drying a coating liquid containing a pigment on at least one surface of a paper substrate 2 to form a coating layer 3 and performing a surface smoothing treatment as necessary. Yes. As is well known, the paper base material 2 is made of various pulp fibers to a certain thickness with an appropriate sizing agent, but the thickness and density of the pulp fibers change randomly during paper making. This change produces a so-called plain paper feeling. Of course, it is possible to print on such plain paper, but because of the infinite number of minute irregularities formed of fibers constituting the paper surface, high-precision printing in photographic style is not possible. Therefore, in order to reproduce a photographic image by printing on a paper surface, the coating layer is provided to eliminate the surface unevenness of the paper base material and improve the whiteness. The coated paper in the present invention may be any paper provided with a pigment layer on the surface of the paper substrate, and may be any coated paper such as art paper, coated paper, and fine coated paper.
しかしながら、上記塗工紙にグラビア印刷方式やオフセット印刷方式で高精細画像を印刷すると、印刷機および印刷インキが完璧なものであっても微妙な印刷むらが発生する。本発明者はこれらの微妙な印刷むらについて詳細な検討を行なったところ、上記印刷むらは塗工紙における塗工層の厚みの変化に起因していることを見出した。 However, when a high-definition image is printed on the coated paper by a gravure printing method or an offset printing method, subtle printing unevenness occurs even if the printing machine and printing ink are perfect. The inventor conducted detailed studies on these subtle printing irregularities, and found that the printing irregularities were caused by changes in the thickness of the coating layer in the coated paper.
すなわち、本発明者の検討によれば、図１に示す矢印Ａの部分（紙基材の薄い部分）は、それに反比例して塗工層が厚くなっており、この領域では印刷時において印刷インキの浸み込みが少なく、印刷画像において比較的高濃度部分となる。一方、図１に示す矢印Ｂの部分（紙基材の厚い部分）は、それに比例して塗工層３が薄くなっており、印刷インキの浸み込みが大きく比較的低濃度部分になること、およびこれらの高・低濃度が印刷むらの原因であることを見出した。 That is, according to the study of the present inventor, the portion indicated by the arrow A (the thin portion of the paper base material) shown in FIG. So that it becomes a relatively high density portion in the printed image. On the other hand, in the part indicated by the arrow B shown in FIG. 1 (the thick part of the paper base material), the coating layer 3 is thinned in proportion thereto, so that the printing ink is soaked into a relatively low density part. And these high and low densities were found to cause printing unevenness.
従って印刷業者が顧客に対して顧客の指定した塗工紙に印刷する場合、該塗工紙をその印刷前に上記の如き塗工層の厚みの変化の度合いを知ることにより、印刷物に印刷むらが発生する可能性の大小を事前に知らせることができる。本発明の方法は上記の如き塗工紙の塗工層の厚みの変化を簡便に知ることができる方法である。 Therefore, when the printing company prints on the coated paper designated by the customer to the customer, by knowing the degree of change in the thickness of the coating layer as described above before printing the coated paper, the printing unevenness is printed on the printed matter. It is possible to notify in advance the magnitude of the possibility of occurrence. The method of the present invention is a method by which the change in the thickness of the coating layer of the coated paper can be easily known.
図２〜図４は、本発明の方法を図解的に説明する図である。図２に示すように、先ず色素水溶液を調製し、シャーレやパンなどの適当な容器に入れる。この容器の形状は、紙質判定用の塗工紙のサンプル、例えば、１０×１０ｃｍ程度の紙片を色素水溶液の面に接触させる程度のサイズであればよい。また、色素水溶液は、染料の水溶液または顔料の水分散液（特許請求の範囲および明細書において便宜上「色素水溶液」と称する）であればよく、その濃度は肉眼で明瞭に観察できる濃度、例えば０．０５〜５質量％であればよく特に限定されない。 2 to 4 are diagrams schematically illustrating the method of the present invention. As shown in FIG. 2, first, an aqueous dye solution is prepared and placed in a suitable container such as a petri dish or a pan. The shape of the container may be a size that allows a sample of coated paper for determining paper quality, for example, a piece of paper of about 10 × 10 cm to be brought into contact with the surface of the aqueous dye solution. The aqueous dye solution may be an aqueous dye solution or an aqueous pigment dispersion (referred to as “aqueous dye solution” in the claims and in the description for the sake of convenience), and the concentration thereof is a concentration that can be clearly observed with the naked eye, for example, 0 It is not particularly limited as long as it is 0.05 to 5% by mass.
上記で使用する染料としては、直接染料、酸性染料、反応性染料、塩基性染料などの何れの染料でもよいが、紙質の判定を良好にするためには、紙を構成しているセルロース繊維に染着しない染料、例えば、酸性染料や塩基性染料の使用が好ましい。また、顔料としては有彩色の有機または無機顔料でよい。染料水溶液を使用すると塗工紙に対する染料水溶液の浸透は非常に速いので、比較的厚い塗工層を有する塗工紙（浸透が遅い）の紙質判定に好適である。また、顔料分散液は紙に対する浸透性が遅いことから、比較的薄い塗工層を有する塗工紙（浸透が速い）の紙質判定に好適である。 The dye used above may be any dye such as a direct dye, an acid dye, a reactive dye, a basic dye, etc., but in order to improve the paper quality, the cellulose fiber constituting the paper is used. It is preferable to use a dye that does not dye, for example, an acid dye or a basic dye. The pigment may be a chromatic organic or inorganic pigment. When the aqueous dye solution is used, the penetration of the aqueous dye solution into the coated paper is very fast, which is suitable for determining the paper quality of a coated paper having a relatively thick coating layer (slow penetration). In addition, since the pigment dispersion has low permeability to paper, it is suitable for determining the paper quality of coated paper having a relatively thin coating layer (fast penetration).
次に紙質を判定すべき塗工紙のサンプルを図２に示すように前記色素水溶液の表面に浮かべてサンプルの一方の面を染料水溶液に接触させる。該接触後数秒以内に色素水溶液がサンプルに吸収され、図３に示すようにサンプルの裏面（大気開放面）に着色斑が観察される。この着色斑が観察される時間はサンプルである塗工紙によって異なるが、サンプルの塗工層が薄い微塗工紙の場合には一瞬であり、その後直ちにサンプルの裏面が全て着色され、紙質判定が困難である場合がある。このような場合には色素水溶液として顔料分散液を使用することが好ましい。何れにしても時間経過によりサンプルの裏面全体が着色されるので、その前の着色斑が観察された時点でその斑点模様を記録する必要がある。 Next, a coated paper sample whose paper quality is to be judged is floated on the surface of the aqueous dye solution as shown in FIG. 2, and one surface of the sample is brought into contact with the aqueous dye solution. Within a few seconds after the contact, the aqueous dye solution is absorbed by the sample, and colored spots are observed on the back surface (atmospheric open surface) of the sample as shown in FIG. The time for which these colored spots are observed varies depending on the coated paper that is the sample, but in the case of a fine coated paper with a thin coating layer of the sample, it is instantaneous, and immediately after that, the back side of the sample is completely colored, and the paper quality Judgment may be difficult. In such a case, it is preferable to use a pigment dispersion as the aqueous dye solution. In any case, since the entire back surface of the sample is colored over time, it is necessary to record the spotted pattern when the previous colored spots are observed.
上記着色斑の記録方法としては、最も簡便な方法は写真撮影であり、正確な記録が得られる。また、別の方法としては、裏面に着色斑が最初に現れた時点でサンプルをピンセットなどの適当な手段で採取して１００℃以上に加熱された乾燥機において乾燥する方法が挙げられる。この方法では乾燥に３０秒程度を要するので、その間にサンプルに吸収されている色素水溶液がサンプルの裏面に現れ、その状態で乾燥によって着色斑が固定されたサンプル（すなわち記録）が得られる。 As the recording method of the colored spots, the simplest method is photography, and accurate recording can be obtained. As another method, there may be mentioned a method in which when a colored spot first appears on the back surface, a sample is collected by an appropriate means such as tweezers and dried in a dryer heated to 100 ° C. or higher. Since this method requires about 30 seconds to dry, an aqueous dye solution absorbed in the sample during that time appears on the back surface of the sample, and in that state, a sample (that is, a recording) in which colored spots are fixed by drying is obtained.
上記記録されたサンプルに現れている斑点模様によって、塗工紙の紙質が判定でき、その後に印刷を行なった場合の印刷むらの発生が予測できる。例えば、図３に示す如く大きな斑点が点在する場合には着色斑の領域は塗工紙の塗工層が薄い領域であり、この領域に印刷された印刷インキの発色濃度は、インクの浸み込みが速いことから印刷物において低濃度領域になり、一方、着色斑が現れていない領域では印刷濃度が高く現れる。従って図３に示す如き着色斑パターンの場合には実際の印刷において印刷むらが発生する可能性が大であると判定できる。 The paper quality of the coated paper can be determined from the speckled pattern appearing in the recorded sample, and the occurrence of uneven printing can be predicted when printing is performed thereafter. For example, when large spots are scattered as shown in FIG. 3, the colored spot area is an area where the coated layer of the coated paper is thin, and the color density of the printing ink printed in this area is Since the soaking is fast, the printed matter has a low density area, while the area where no colored spots appear has a high printing density. Therefore, in the case of the colored spot pattern as shown in FIG. 3, it can be determined that there is a high possibility of uneven printing in actual printing.
一方、図４に示すように着色斑が小さく、サンプル全面に多数現れる場合には、ミクロ的には印刷むらが発生するが、肉眼では印刷むらが識別できず、実質上問題となる印刷むらが現れない塗工紙であると判定できる。図３および図４に示す例は１例であり、１種の塗工紙から複数のサンプルを切り出し、複数回の判定を行なうことで、塗工紙全体における着色むらの発生を予測することができる。以上の如く本発明の方法によれば、実際に印刷された場合における印刷むらを事前に予測することができるので、どの程度の印刷むらが顧客において許容できるかについて予め確認することができ、或いは印刷用塗工紙を変更して印刷むらの発生を最低限とすることができる。 On the other hand, as shown in FIG. 4, when the colored spots are small and a large number appear on the entire surface of the sample, printing unevenness occurs microscopically, but the printing unevenness cannot be identified with the naked eye, which is a practical problem. It can be determined that the coated paper does not appear. The example shown in FIG. 3 and FIG. 4 is an example, and it is possible to predict the occurrence of uneven coloring in the entire coated paper by cutting out a plurality of samples from one type of coated paper and performing a plurality of determinations. it can. As described above, according to the method of the present invention, it is possible to predict printing unevenness in the case of actual printing in advance, so it is possible to confirm in advance how much printing unevenness is acceptable in the customer, or It is possible to minimize the occurrence of uneven printing by changing the coated paper for printing.
次に実施例を挙げて本発明をさらに詳しく説明する。
実施例１
酸性染料（Ｃ．Ｉ．アシッド レッド−１）を水道水５００ｍｌに溶解して１．０質量％の染料水溶液を作成し、大型のシャーレに移した。一方、印刷用塗工紙（商品名 フィネス、ＵＰＭ（アメリカ）会社製、坪量９０ｇ／ｍ2、塗工量２０ｇ／ｍ2以上）の一部を１０×１０ｃｍの正方形に切り取ったサンプルを上記染料水溶液の表面に浮かべたところ、約２秒後にサンプルの裏面（大気開放面）に染料水溶液による斑点が現れた。さらに１秒経過後に図３に示す如き着色斑が現れたところで写真撮影して着色斑を記録した。この操作を同一塗工紙の別の個所から切り出された３個のサンプルについても行なったところ、合計４枚のサンプルはほぼ類似の着色斑を有することが判明した。次に上記の塗工紙に人の顔を撮影した写真原稿を用いてオフセット印刷により原稿画像を再現したところ、中間色領域において僅かであるが印刷むらが認められた。
EXAMPLES Next, an Example is given and this invention is demonstrated in more detail.
Example 1
An acid dye (CI Acid Red-1) was dissolved in 500 ml of tap water to prepare a 1.0% by mass dye aqueous solution, which was transferred to a large petri dish. On the other hand, a sample obtained by cutting a part of coated paper for printing (trade name Finesse, UPM (USA) company, basis weight 90 g / m 2, coating amount 20 g / m 2 or more) into a 10 × 10 cm square is shown above. When it floated on the surface of the aqueous dye solution, after about 2 seconds, spots due to the aqueous dye solution appeared on the back surface (atmospheric open surface) of the sample. Further, when colored spots as shown in FIG. 3 appeared after 1 second, a photograph was taken to record the colored spots. When this operation was performed on three samples cut out from different portions of the same coated paper, it was found that a total of four samples had almost similar colored spots. Next, when an original image was reproduced by offset printing using a photographic original obtained by photographing a human face on the coated paper, slight printing unevenness was recognized in the intermediate color region.
実施例２
実施例１において染料として塩基性染料（Ｃ．Ｉ．ベーシックブラック−２）を用い、印刷用塗工紙として商品名 ＯＫトップコートＮ、王子製紙会社製、坪量８４．９ｇ／ｍ2、塗工量２０ｇ／ｍ2以上を用いて実施例１と同様にして染料水溶液を吸収させたところ、染料水溶液による微細な着色斑が１秒後に現れた、直ちにサンプルをピンセットで取り出し、１５０℃の温度で３０秒間乾燥したところ、着色斑は図４に示す如く広がっていた。その後は実施例１と同様にして印刷を行なったところ、１００倍のルーペにより観察すると微妙な印刷むらが認められたが、肉眼では画像の全領域において印刷むらは認められなかった。
Example 2
In Example 1, a basic dye (CI Basic Black-2) was used as the dye, and the trade name was OK Top Coat N, manufactured by Oji Paper Co., Ltd., with a basis weight of 84.9 g / m 2. When an aqueous dye solution was absorbed in the same manner as in Example 1 using a work amount of 20 g / m 2 or more, fine colored spots due to the aqueous dye solution appeared 1 second later. When dried at a temperature for 30 seconds, the colored spots spread as shown in FIG. Thereafter, printing was carried out in the same manner as in Example 1. When observed with a 100 × magnifier, fine print unevenness was observed, but no print unevenness was observed in the entire area of the image with the naked eye.
本発明によれば、印刷用塗工紙、印刷機および印刷インキが個々には全て完璧であってもそれらの組み合わせによって生じる印刷むらを、実際の印刷前に予測可能な塗工紙の紙質の判定方法を提供することができる。 According to the present invention, even if printing coated paper, printing press and printing ink are all perfect individually, the printing unevenness caused by the combination of them can be predicted before actual printing. A determination method can be provided.
１：塗工紙（サンプル）
２：紙基材
３：塗工層
４：色素水溶液
５：容器
６：着色斑
1: Coated paper (sample)
2: Paper base material 3: Coating layer 4: Dye aqueous solution 5: Container 6: Colored spots
Claims (4)
The paper quality determination method according to claim 1, wherein the colored spots are recorded by photography.
Priority Applications (1)
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| JP2003400975A JP4280154B2 (en) | 2003-12-01 | 2003-12-01 | Judgment method of coated paper quality |
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| JP2003400975A JP4280154B2 (en) | 2003-12-01 | 2003-12-01 | Judgment method of coated paper quality |
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| JP2005164308A true JP2005164308A (en) | 2005-06-23 |
| JP4280154B2 JP4280154B2 (en) | 2009-06-17 |
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