JP2004256950A - Newsprint paper for offset printing - Google Patents
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- JP2004256950A JP2004256950A JP2003048975A JP2003048975A JP2004256950A JP 2004256950 A JP2004256950 A JP 2004256950A JP 2003048975 A JP2003048975 A JP 2003048975A JP 2003048975 A JP2003048975 A JP 2003048975A JP 2004256950 A JP2004256950 A JP 2004256950A
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Abstract
Description
【０００１】
【発明の属する技術分野】本発明はオフセット印刷用新聞に関し、詳しくは、原紙の少なくとも一方の面に塗工層を設けて、特に印刷適性にすぐれ、さらに不透明性及び隠蔽性をもたせたオフセット印刷用新聞用紙に関する。
【０００２】
【従来の技術】
近年、新聞印刷はオフセット輪転印刷による高速化が急速に進んでおり、それに付随して、印刷媒体となる新聞用紙に対しても印刷適性や印刷作業性が求められている。加えて、新聞用紙は省資源や輸送コスト等の面から軽量化が促進され、従来の坪量４６ｇ／ｍ２の軽量紙から坪量４３ｇ／ｍ２の超軽量紙が市場の中心を占めるようになっている。
【０００３】
しかし、新聞用紙の軽量化に伴い、一方の面の印刷が他方の面から見えなくする不透明性・隠蔽性などの光学適性は低下する方向にある。このため、填料の添加の検討が行われており、その填料として、嵩高で比表面積が大きく（比重が小さく）、高い屈折率と吸油性を有するホワイトカーボン（微粒子珪酸塩）の使用が主流となっている［特開平３−２６０１９４号公報（特許文献１）］。また、水和珪酸も多く使用されている［特開平９−１７６９８６号公報（特許文献２）、特開２００２−２９４５８７号公報（特許文献３）］。
【０００４】
しかしながら、物理的強度と光学適性の向上とは相反する関係にあり、例えば不透明性を付与するために填料を過剰に添加すると、物理的強度の低下を引き起すことが知られている。これに加えて、前記の填料であるホワイトカーボン、水和珪酸はその使用が軽量化に大きく寄与するものの、それ自体が高価である。また、これらの填料の内添は中性抄紙ｐＨ６〜８では歩留まりが必ずしも良好でなく、十分な不透明性及び隠蔽性は得られていない。
【０００５】
【特許文献 １】
特開平３−２６０１９４号公報
【特許文献 ２】
特開平９−１７６９８６号公報
【特許文献３】
特開２００２−２９４５８７号公報
【０００６】
【発明が解決しようとする課題】
本発明の課題は、十分な不透明度及び隠蔽性が得られ、オフセット印刷に適した表面を有し、しかも製造コストの高騰が抑制できるオフセット印刷用新聞用紙を提供することにある。
【０００７】
【課題を解決するための手段】
上記課題は下記（１）〜（３）によって達成される。
【０００８】
（１）原紙の少なくとも一方側の面に、ホワイトカーボン及びクレーを主成分とし、かつ、これらホワイトカーボンとクレーとの配合割合が９：１〜５：５である表面処理剤を塗工してなることを特徴とするオフセット印刷用新聞用紙。
【０００９】
（２）表面処理剤で塗工された面はＪＩＳ Ｐ ８１４７に基づいて測定された動摩擦係数が０．３〜１．５ｍＮの範囲にあることを特徴とする上記（１）記載のオフセット印刷用新聞用紙。
【００１０】
（３）表面処理剤で塗工された面は、エネルギー分散型Ｘ線マイクロアナライザーによって面分析して得られるＸ線像のＡｌの存在部分を示す白色部分の面積が該Ｘ線像全体の面積の３〜４０％とする上記（１）又は（２）に記載のオフセット印刷用新聞用紙。
【００１１】
【発明の実施の形態】
以下、本発明をさらに詳細に説明する。
【００１２】
本発明の原紙を抄造によって得る際の原料パルプとしては、通常の新聞用紙と同様のパルプを使用することができ、その種類は何ら限定されない。したがって、例えば、ストーングランドパルプ（ＳＧＰ）、加圧ストーングランドパルプ（ＰＧＰ）、リファイナーグランドパルプ（ＲＧＰ）、ケミグランドパルプ（ＣＧＰ）、サーモグランドパルプ（ＴＧＰ）、砕木パルプ（ＧＰ）、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）、リファイナーメカニカルパルプ（ＲＭＰ）等の機械パルプや、デインクドパルプ（ＤＩＰ）、ウェステッドパルプ（ＷＰ）等の古紙パルプから１種あるいは数種を適宜選択して使用することができる。また、必要によっては、クラフトパルプ等の化学パルプも使用することができる。
【００１３】
本発明に係る新聞用紙は、まず前記原料パルプに填料、サイズ剤（紙力増強剤、歩留り向上剤、強化ロジンサイズ剤、エマルジョンサイズ剤など）、耐水化剤、紫外線防止剤等の一般に公知の抄紙用薬品が添加された後、公知の抄造工程により抄紙して原紙（紙支持体）を得る。原料パルプの抄紙に際しては、酸性域で行っても、中性ないしアルカリ性域で行ってもよいが、好ましくはｐＨ６〜８の中性域で行うのがよい。
【００１４】
続いて、この原紙の少なくとも一方の面にホワイトカーボン及びクレーを主成分とする表面処理剤を塗布、乾燥してオフセット印刷用新聞用紙が製造される。
【００１５】
ホワイトカーボンは、ポーラスな凝集構造を形成しているため、不透明度を向上させるものであるが、特に、見掛比重が０．１０〜０．２５ｇ／ｍｌ、比表面積が１００〜２５０ｍ２／ｇ、コールターカウンター法による粒度分布としてＤ５０μｍが３．０〜８．０、Ｄ８０μｍが８．０〜１８．０、Ｄ９７μｍが１９．０〜４０．０、吸油量１８０〜２６０ｍｌ／１００ｇのものが望ましい。
【００１６】
一方、クレーはＡｌ２Ｏ３・２ＳｉＯ２・２Ｈ２Ｏ に近い組成を有する体質顔料で、不透明性及び隠蔽性を向上させるものであるが、特にインティアラムクレーが不透明性の点で望ましい。
【００１７】
ホワイトカーボンとクレーとの配合重量割合は９：１〜５：１、より好ましくは８：２〜６：４である。ホワイトカーボン配合重量割合が９割を超える場合には、低廉化を図ることができない。また、５割未満の場合には不透明度及び隠蔽性などの光学適性を満足し得ない。
【００１８】
表面処理剤（塗工液）の接着剤には例えばスチレン−ブタジエン共重合体等のラテックス 、ポリビニルアルコール、ポリアクリルアミド、変性澱粉などが用いられる。
【００１９】
表面処理剤には、上記のホワイトカーボン、クレー、接着剤の他に、抄紙分野で通常使用されている表面サイズ剤、消泡剤、増粘剤等の助剤を適宜併用することができる。
【００２０】
また、ホワイトカーボン及びクレーの塗工層に占める割合は、塗工層にオフセット印刷適性をもたせ、更に十分な不透明度及び隠蔽性をもたせるためには全固形分中０．３〜３重量％、好ましくは０．５〜２重量％占めるのが効果的である。
【００２１】
塗工層の乾燥塗布量は、顔料（ホワイトカーボン及びクレー）ベースで原紙の片面当り０．１〜１．５ｇ／ｍ２、好ましくは０．２〜１．０ｇ／ｍ２で塗工される。０．１ｇ／ｍ２未満では十分な不透明性・隠蔽性が得られにくく、逆に１．５ｇ／ｍ２を超えるとネッパリ性（新聞用紙表面が湿った状態における粘着性）に起因するブランケットへの張り付き等のおそれが生じることがある。
【００２２】
塗布装置としては特に限定されるものではないが、例えば２ロールサイズプレス、ブレードメタリングサイズプレス、ロッドメタリングサイズプレス、ゲートロールコーター、ブレードコーターバーコーター、ロッドブレードコーター、エアーナイフコーター等が適宜使用される。なお、本発明に係るオフセット印刷用新聞用紙は、従来と同様に原紙へ表面処理剤が塗布、乾燥された後、必要に応じて、表面を平滑化して製品仕上げが行われる。その際の平滑化には、通常キャレンダーが使用されるが、あまり加圧条件を強くせずに平滑化効果の大きいソフトキャレンダーが好ましく使用される。
【００２３】
このようにして製造された新聞用紙は、十分な不透明度及び隠蔽性及を有しているだけでなく、ネッパリ性、ブランケットパイリングの発生を生じさせないものである。
【００２４】
本発明の新聞用紙の塗工面は、ＪＩＳ Ｐ ８１４７に規定の動摩擦係数が０．３〜１．５ｍＮ好ましくは０．５〜１．２ｍＮの範囲にあるのが望ましい。本発明の新聞用紙の表面の動摩擦係数を０．３〜１．５ｍＮ範囲に収めるには新聞用紙中に内添する填料の量を増減することで達成される。これにより、本発明の新聞用紙の表面強度はより良好なものとなる。
【００２５】
さらに本発明の新聞用紙の塗工面は、エネルギー分散型Ｘ線マイクロアナライザー（ＥＰＭＡ：Ｅｌｅｃｔｒｏｎ Ｐｒｏｂｅ Ｍｉｃｒｏ−Ａｎａｌｙｓｉｓ）によって面分析して得られるＸ線像のＡｌの存在部分を示す白色部分の面積が、Ｘ線像全体の面積の３〜４０％、好ましくは２０〜３０％の範囲にあることが望ましい。これは抄紙スピードを調整することで達成される。ＡＬの存在部分を示す白色部分の面積が３％未満の場合には、不透明度及び隠蔽性などの光学的適性を満足し得ない。また、４０％を超える場合には低廉化を図ることができない。
【００２６】
なお、エネルギー分散型Ｘ線マイクロアナライザーは電子線を試料に照射し、２ミクロン領域の元素分析や二次電子像観察が可能で、金属、有機材料の分析、生体、生物繊維の分析に利用できる装置である。この装置には例えば島津製作所製のＥＰＭＡ−８７０５などある。本発明においては、Ｘ線マイクロアナライザーの加速電圧は１５ＫＶ、倍率５０倍とし、ポラロイド社製白黒ポラロイドフィルム（８．５×１０．８ｃｍ）にて、Ｘ線マイクロアナリザーディスプレーのＸ線像を撮影した。撮影を新聞用紙の表面を無作為に１００箇所行い、得られたＸ線像写真中のＡｌの存在部分を示す白色部分の面積率は、前記ポラロイドフィルムに撮影のＸ線像写真を用い、画像処理装置（株式会社ニレコ製 ルーゼックスＦＳ）にて測定した。画像処理装置は、写真、印刷物等の色分布を、それぞれ面積率で算出する装置である。
【００２７】
【実施例】
次に、実施例を挙げて本発明をより具体的に説明する。ここでの部は重量基準である。
【００２８】
〈実施例１〉
（原紙の作成）針葉樹クラフトパルプ（ＮＢＫＰ）１４部、サーモメカニカルパルパルプ（ＴＭＰ）３９部、グラウンドパルプ（ＧＰ）６部、新聞脱墨古紙パルプ（ＤＩＰ）４１部の比率構成になるパルプスラリーを調整した。かくして得られたパルプスラリーに固形分対比でパルプに対してロジンエマルジョンサイズ（品名：ＳＰＮ−７７３／荒川化学工業社製）０．３％、硫酸バンド１％、および填料としてクレーを灰分で２．５％となるように添加し、ツインワイヤー型抄紙機を使用して抄紙を行い、米坪３９ｇ／ｍ２の原紙を得た。なお、原紙灰分はＪＩＳ Ｐ８１２８に準拠して測定した。
【００２９】
（新聞用紙の作成）
表面処理剤として、ホワイトカーボン（トクヤマ製：トクシール（見掛比重が０．１７ｇ／ｍ２、比表面積が１６９ｍ２／ｇ、コールターカウンター法による粘度分布としてＤ５０μｍ４．６、Ｄ８０μｍが９．１、Ｄ９７μｍが２０．２、吸油量２３４ｍｌ／１００ｇ）５０部とクレー５０部、分散媒（東亜合成化学製：アロンＴ４０）０．０２部及び接着剤（三井化学社製：ポリアクリルアミド）１５部からなる表面処理剤を調整した。
【００３０】
この表面処理剤を前記で得た原紙の両面に、ゲートロールコーターを使用して、乾燥重量が片面当り０．８ｇ／ｍ２となるように塗布、乾燥した後、ソフトカレンダーで処理してオフセット印刷用新聞用紙を製造した。
【００３１】
〈実施例２〉
ホワイトカーボンの配合量を６５部とし、またクレーの配合量３５部とした以外は実施例１と同様にして、オフセット印刷用新聞用紙を製造した。
【００３２】
〈実施例３〉
ホワイトカーボンの配合量を９０部とし、またクレーの配合量１０部とした以外は実施例１と同様にして、オフセット印刷用新聞用紙を製造した。
【００３３】
〈比較例１〉
実施例１における、ホワイトカーボンを５０部及びクレー５０部の代わりにホワイトカーボンのみ１００部を用いた以外は実施例１と同様にして、オブセット新聞用紙を製造した。
【００３４】
〈比較例２〉
実施例１における、ホワイトカーボンを４０部及びクレー６０部を用いた以外は実施例１と同様にして、オブセット新聞用紙を製造した。
【００３５】
〈比較例３〉
実施例１における、ホワイトカーボンを１０部及びクレー９０部を用いた以外は実施例１と同様にして、オブセット新聞用紙を製造した。
【００３６】
これら実施例１〜３、及び比較例１〜３で得られた新聞用紙についての品質評価を行った。結果を表１に示す。
【００３７】
（不透明度） ＪＩＳ Ｐ ８１３８に準じて測定した。
（印刷不透明度） オフセット輪転印刷機で、オフセット輪転印刷用インキ（墨）のインキ量を変えて印刷し、印刷面反射率が９％のときの、印刷前の裏面反射率（印刷面の反射面）に対する印刷後の裏面反射率の比率を求めた。なお、反射率の測定には分光白色度測色機（スガ試験機社製）を用いた。
（動摩擦係数） ＪＩＳ Ｐ ８１４７ に準じて測定した。
（Ｘ線像Ａｌ面積） 島津製作所製のＥＰＭＡ−８７０５で測定した。
【００３８】
【表１】
【発明の効果】
本発明のオフセット印刷用紙は、原紙表面の少なくとも一方側に表面処理剤を塗工することで、表面強度が高く、不透明度の問題もなく、高速輪転機オフセット印刷に適応したオフセット用新聞用紙を得ることができる。また、ホワイトカーボンの一部を安価なクレーに代替させているので、製造コストを下げることが可能となった。[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a newspaper for offset printing, and more specifically, offset printing provided with a coating layer on at least one side of a base paper, particularly excellent in printability, and further having opacity and concealment. Related to newspaper.
[0002]
[Prior art]
In recent years, the speed of newspaper printing has been rapidly increased by rotary offset printing. Along with this, printing aptitude and printing workability are also required for newsprint as a printing medium. In addition, newsprint is promoted weight from the viewpoint of such as saving resources and transport costs, ultra-light paper having a basis weight of 43 g / m 2 from a lightweight paper of a conventional basis weight 46 g / m 2 is to occupy the center of the market It has become.
[0003]
However, along with the reduction in weight of newsprint, optical aptitudes such as opacity and concealment that make printing on one side invisible from the other side tend to decrease. For this reason, the addition of fillers has been studied, and the use of white carbon (particulate silicate) that is bulky, has a large specific surface area (small specific gravity), and has a high refractive index and oil absorption is the mainstream. [Japanese Patent Laid-Open No. 3-260194 (Patent Document 1)]. Also, hydrated silicic acid is often used [JP-A-9-176986 (Patent Document 2), JP-A-2002-294987 (Patent Document 3)].
[0004]
However, there is a contradictory relationship between improvement in physical strength and optical suitability, and for example, it is known that excessive addition of filler to impart opacity causes a decrease in physical strength. In addition, although the use of white carbon and hydrated silicic acid, which are the fillers, greatly contributes to weight reduction, they are themselves expensive. Moreover, the internal addition of these fillers does not necessarily have a good yield at neutral papermaking pH of 6 to 8, and sufficient opacity and concealment are not obtained.
[0005]
[Patent Document 1]
Japanese Patent Laid-Open No. 3-260194 [Patent Document 2]
JP-A-9-176986 [Patent Document 3]
Japanese Patent Laid-Open No. 2002-294587
[Problems to be solved by the invention]
An object of the present invention is to provide a newsprint for offset printing that has sufficient opacity and concealability, has a surface suitable for offset printing, and can suppress an increase in manufacturing cost.
[0007]
[Means for Solving the Problems]
The said subject is achieved by following (1)-(3).
[0008]
(1) A surface treatment agent containing white carbon and clay as main components and a white carbon / clay blending ratio of 9: 1 to 5: 5 is applied to at least one side of the base paper. Newsprint paper for offset printing.
[0009]
(2) The surface coated with the surface treatment agent has a dynamic friction coefficient measured in accordance with JIS P 8147 in the range of 0.3 to 1.5 mN. Newspaper.
[0010]
(3) The surface coated with the surface treatment agent is such that the area of the white portion showing the Al-existing portion of the X-ray image obtained by surface analysis with an energy dispersive X-ray microanalyzer is the area of the entire X-ray image. The newspaper for offset printing according to the above (1) or (2), wherein the content is 3 to 40% of the above.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in more detail.
[0012]
As the raw material pulp for obtaining the base paper of the present invention by papermaking, the same pulp as that used in ordinary newsprint can be used, and the kind thereof is not limited at all. Thus, for example, stone ground pulp (SGP), pressurized stone ground pulp (PGP), refiner ground pulp (RGP), chemi-ground pulp (CGP), thermo ground pulp (TGP), ground wood pulp (GP), thermomechanical pulp (TMP), Chemi-thermomechanical pulp (CTMP), refiner mechanical pulp (RMP) and other mechanical pulp, and one or several types of used paper pulp such as deinked pulp (DIP) and Wested pulp (WP) You can select and use. If necessary, chemical pulp such as kraft pulp can also be used.
[0013]
The newsprint according to the present invention is generally known as a filler, sizing agent (paper strength enhancer, yield improver, reinforced rosin sizing agent, emulsion sizing agent, etc.), water-resistant agent, UV inhibitor, etc. After the papermaking chemicals are added, papermaking is performed by a known papermaking process to obtain a base paper (paper support). When making the pulp of the raw material, it may be carried out in the acidic range or in the neutral to alkaline range, but preferably in the neutral range of pH 6-8.
[0014]
Subsequently, a surface treatment agent mainly composed of white carbon and clay is applied to at least one surface of the base paper and dried to produce offset printing newsprint.
[0015]
Since white carbon forms a porous aggregate structure, it improves opacity. In particular, the apparent specific gravity is 0.10 to 0.25 g / ml, and the specific surface area is 100 to 250 m 2 / g. , D 50 [mu] m is 3.0 to 8.0 as the particle size distribution by Coulter counter method, D 80 [mu] m is from 8.0 to 18.0, D 97 [mu] m is 19.0 to 40.0, oil absorption 180～260Ml / 100g is desirable.
[0016]
On the other hand, clay is Al 2 O 3 · 2SiO 2 · 2H 2 O. Is an extender having a composition close to, which improves opacity and concealment. In particular, intimal clay is desirable in terms of opacity.
[0017]
The blending weight ratio of white carbon and clay is 9: 1 to 5: 1, more preferably 8: 2 to 6: 4. If the white carbon blending weight ratio exceeds 90%, the cost cannot be reduced. If it is less than 50%, optical suitability such as opacity and concealment cannot be satisfied.
[0018]
For example, latex such as styrene-butadiene copolymer, polyvinyl alcohol, polyacrylamide, modified starch, or the like is used as an adhesive for the surface treatment agent (coating liquid).
[0019]
In addition to the above white carbon, clay, and adhesive, auxiliary agents such as a surface sizing agent, an antifoaming agent, and a thickener that are usually used in the papermaking field can be used in combination with the surface treatment agent.
[0020]
The proportion of white carbon and clay in the coating layer is 0.3 to 3% by weight based on the total solid content in order to give the coating layer offset printing suitability and further sufficient opacity and concealment, It is effective to occupy 0.5 to 2% by weight.
[0021]
Dry coating amount of the coating layer, the pigment (white carbon and clay) per side 0.1 to 1.5 g / m 2 base paper in the base, is coated preferably 0.2 to 1.0 g / m 2 . 0.1 g / m hardly sufficient opacity, hiding property is obtained is less than 2, when conversely exceeds 1.5 g / m 2 Neppari of the blanket due to the (adhesive in a state where newsprint surface wet) There is a risk of sticking.
[0022]
Although it does not specifically limit as a coating device, For example, 2 roll size press, a blade metalling size press, a rod metalling size press, a gate roll coater, a blade coater bar coater, a rod blade coater, an air knife coater etc. are suitably used. used. In addition, the newspaper for offset printing according to the present invention is finished with a surface smoothed as necessary after finishing the surface treatment agent applied to the base paper and dried as in the prior art. A calender is usually used for smoothing at that time, but a soft calender having a large smoothing effect without increasing the pressure condition is preferably used.
[0023]
The newsprint produced in this way not only has sufficient opacity and concealment, but also does not cause the occurrence of nepariness and blanket piling.
[0024]
The coated surface of the newsprint of the present invention preferably has a dynamic friction coefficient specified in JIS P 8147 in the range of 0.3 to 1.5 mN, preferably 0.5 to 1.2 mN. In order to keep the dynamic friction coefficient of the surface of the newsprint of the present invention in the range of 0.3 to 1.5 mN, it is achieved by increasing or decreasing the amount of filler internally added to the newsprint. Thereby, the surface strength of the newsprint of the present invention becomes better.
[0025]
Furthermore, the coated surface of the newsprint of the present invention has an area of a white portion indicating an Al-existing portion of an X-ray image obtained by surface analysis by an energy dispersive X-ray microanalyzer (EPMA: Electron Probe Micro-Analysis), It is desirable that it is in the range of 3 to 40%, preferably 20 to 30% of the total area of the X-ray image. This is achieved by adjusting the papermaking speed. When the area of the white portion indicating the portion where AL is present is less than 3%, optical suitability such as opacity and concealment cannot be satisfied. Moreover, when it exceeds 40%, cost reduction cannot be achieved.
[0026]
The energy dispersive X-ray microanalyzer can irradiate a sample with an electron beam and perform elemental analysis and observation of secondary electron images in the 2 micron region. It can be used for analysis of metals and organic materials, living organisms, and biological fibers. Device. This apparatus includes, for example, EPMA-8705 manufactured by Shimadzu Corporation. In the present invention, an X-ray microanalyzer display is taken with an X-ray microanalyzer display using an X-ray microanalyzer with an acceleration voltage of 15 KV and a magnification of 50 times, and a polaroid black and white polaroid film (8.5 × 10.8 cm). did. Photographing was performed at 100 random locations on the surface of newsprint, and the area ratio of the white portion showing the Al existing portion in the obtained X-ray image photograph was obtained by using the X-ray image photograph taken on the polaroid film. It measured with the processing apparatus (Nileko Co., Ltd. Luzex FS). The image processing apparatus is an apparatus that calculates color distributions of photographs, printed materials, and the like by area ratios.
[0027]
【Example】
Next, the present invention will be described more specifically with reference to examples. The parts here are based on weight.
[0028]
<Example 1>
(Preparation of base paper) A pulp slurry having a ratio composition of 14 parts of softwood kraft pulp (NBKP), 39 parts of thermomechanical pulp (TMP), 6 parts of ground pulp (GP), 41 parts of newspaper deinked waste paper pulp (DIP) It was adjusted. In the pulp slurry thus obtained, rosin emulsion size (product name: SPN-773 / manufactured by Arakawa Chemical Co., Ltd.) 0.3% with respect to the pulp in terms of solid content, sulfuric acid band 1%, and clay as ash 2. It added so that it might become 5%, and papermaking was performed using the twin wire type | mold paper machine, and the base paper of 39 g / m < 2 > of tsubo was obtained. The base paper ash content was measured according to JIS P8128.
[0029]
(Creation of newspaper)
As a surface treatment agent, white carbon (manufactured by Tokuyama: Tokuseal (apparent specific gravity 0.17 g / m 2 , specific surface area 169 m 2 / g, viscosity distribution by Coulter counter method: D 50 μm 4.6, D 80 μm 9) .1, D 97 μm is 20.2, oil absorption 234 ml / 100 g) 50 parts and clay 50 parts, dispersion medium (manufactured by Toa Gosei Chemical: Aron T40) and adhesive (manufactured by Mitsui Chemicals: polyacrylamide) ) A surface treating agent consisting of 15 parts was prepared.
[0030]
This surface treatment agent was applied to both sides of the base paper obtained above using a gate roll coater, dried so that the dry weight was 0.8 g / m 2 per side, and then treated with a soft calender to offset. Produced newsprint for printing.
[0031]
<Example 2>
Newspaper for offset printing was manufactured in the same manner as in Example 1 except that the amount of white carbon was 65 parts and the amount of clay was 35 parts.
[0032]
<Example 3>
Newsprint paper for offset printing was manufactured in the same manner as in Example 1 except that the amount of white carbon was 90 parts and the amount of clay was 10 parts.
[0033]
<Comparative example 1>
Obset newsprint was produced in the same manner as in Example 1 except that 50 parts of white carbon in Example 1 and 100 parts of white carbon alone were used instead of 50 parts of clay.
[0034]
<Comparative example 2>
Obset newsprint was produced in the same manner as in Example 1 except that 40 parts of white carbon and 60 parts of clay were used.
[0035]
<Comparative Example 3>
Obset newsprint was produced in the same manner as in Example 1 except that 10 parts of white carbon and 90 parts of clay were used.
[0036]
The quality of the newsprint obtained in Examples 1 to 3 and Comparative Examples 1 to 3 was evaluated. The results are shown in Table 1.
[0037]
(Opacity) Measured according to JIS P 8138.
(Opacity of printing) Backside reflectance before printing (printed surface reflection) when printing is performed with an offset rotary printing machine with different amounts of offset rotary ink (black) and the printed surface reflectance is 9%. The ratio of the back surface reflectance after printing to the (surface) was determined. Note that a spectral whiteness colorimeter (manufactured by Suga Test Instruments Co., Ltd.) was used for the reflectance measurement.
(Dynamic friction coefficient) It measured according to JISP8147.
(X-ray image Al area) It measured by EPMA-8705 by Shimadzu Corporation.
[0038]
[Table 1]
【The invention's effect】
The offset printing paper of the present invention is a newspaper for offset that is suitable for high-speed rotary offset printing by applying a surface treatment agent to at least one side of the surface of the base paper to provide high surface strength and no opacity problems. Can be obtained. In addition, since some of the white carbon is replaced with inexpensive clay, the manufacturing cost can be reduced.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003048975A JP4215239B2 (en) | 2003-02-26 | 2003-02-26 | Newsprint paper for offset printing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003048975A JP4215239B2 (en) | 2003-02-26 | 2003-02-26 | Newsprint paper for offset printing |
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| Publication Number | Publication Date |
|---|---|
| JP2004256950A true JP2004256950A (en) | 2004-09-16 |
| JP4215239B2 JP4215239B2 (en) | 2009-01-28 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006328605A (en) * | 2005-05-27 | 2006-12-07 | Daio Paper Corp | Newsprint paper |
| JP2007332508A (en) * | 2006-06-16 | 2007-12-27 | Daio Paper Corp | Newsprint paper |
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2003
- 2003-02-26 JP JP2003048975A patent/JP4215239B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006328605A (en) * | 2005-05-27 | 2006-12-07 | Daio Paper Corp | Newsprint paper |
| JP2007332508A (en) * | 2006-06-16 | 2007-12-27 | Daio Paper Corp | Newsprint paper |
| JP4677371B2 (en) * | 2006-06-16 | 2011-04-27 | 大王製紙株式会社 | Newspaper |
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| JP4215239B2 (en) | 2009-01-28 |
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