JP4523255B2 - Newspaper for offset printing and its evaluation method - Google Patents
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Description
本発明は、新聞オフセット輪転機の折り部における剣先詰りの評価方法および新聞印刷用紙の横方向の見当ずれの評価方法に関する。更に、剣先詰まりおよび／またはCD方向の見当ずれが少ないオフセット印刷用新聞用紙に関する。 The present invention relates to a method for evaluating clogging of a sword at a folded portion of a newspaper offset rotary press and a method for evaluating a lateral misregistration of newspaper printing paper. Further, the present invention relates to a newsprint for offset printing with less clogging of the sword and / or less registration in the CD direction.
新聞社では、最新のニュースを記事にすることが必要であるため、プリプレスへのデジタル化技術の導入、印刷拠点の分散化、印刷機の高速化などを進め、新聞印刷の現場では徹底した効率化を図り、印刷時間の短縮に努めている。そのため、新聞印刷用紙においては、印刷適性とともに、作業適性も重要視されており、印刷時間の遅延を引き起こすような作業性に関わるトラブルが最も敬遠されている。例えば、作業性に関わる代表的なトラブルのひとつとして、剣先詰りが挙げられる。 Newspaper publishers need to make the latest news into articles, so they introduced digital technology into prepress, decentralized printing bases, speeded up printing presses, etc. To shorten the printing time. Therefore, in newspaper printing paper, workability as well as printability is regarded as important, and troubles related to workability that cause a delay in printing time are most avoided. For example, one of the typical troubles related to workability is clogging of the sword.
この剣先詰まりを図１で説明する。図１に示すように各プレスで印刷された用紙は折り部入口で重ねられた後、ドラッグローラー５とワリス４で引張られ、フォーマー６（三角板）へ進み、フォーミングローラー７を経て、ニッピングローラー８で中央から二つ折りにされる。この際、何らかの原因により、フォーマー周辺で発生する紙詰りを剣先詰りと呼んでいる。また、フォーマー先端部で裂けた用紙が固まった状態でローラー部を通過すると、ロールや折り機などを破損し、重大なトラブルに発展する場合もある。 This clogging of the sword will be described with reference to FIG. As shown in FIG. 1, the paper printed by each press is overlapped at the entrance of the folding part, then pulled by the drag roller 5 and the wallis 4, proceeds to the former 6 (triangular plate), passes through the forming roller 7, and the nipping roller 8 is folded in half from the center. At this time, a paper jam that occurs around the former for some reason is called a sword clog. In addition, if the paper that has been torn at the front end of the former passes through the roller portion in a solid state, the roll or the folding machine may be damaged, resulting in a serious trouble.
この剣先詰まりを抑制する従来の技術としては、新聞オフセット輪転機のフォーマーでの新聞印刷用紙の折れ適性や曲げ適性を重要視した観点から、例えば、CD方向の平均純曲げ剛度での管理が行なわれている(特許文献１参照)。しかしながら、近年のサテライトおよびタワープレスによる４色印刷の増加に伴い、折り部で発生する剣先トラブルは増加しており、カラー面を最中面の見開き反転ページに持つ場合、特にその傾向が大きくなっている。このような場合の剣先詰りに対しては、曲げ適性だけでは剣先詰りの発生を評価できない状況であった。 As a conventional technique for suppressing this clogging of the sword, for example, management with the average net bending stiffness in the CD direction is performed from the viewpoint of emphasizing the folding and bending properties of newspaper printing paper in the newspaper offset press former. (See Patent Document 1). However, with the increase in four-color printing by satellites and tower presses in recent years, the sword tip trouble that occurs at the folds has increased, and this tendency is particularly large when the color surface is on the center spread spread inverted page. ing. In such a case, the occurrence of a sword clog cannot be evaluated only by bending aptitude.
一方、タワープレスでカラー印刷が行なわれる場合、各単色プレスにおいて、新聞用紙が湿し水を吸収し、紙が伸びることで１色目と２色目以降の見当ずれが少なからず発生する。見当ずれのうち、ブランケットのニップにより紙の進行と直角の方向つまりCD方向に紙が伸びる現象は、上に行くに従い、扇状に広がることからファンアウトと呼ばれている。タワープレスとは、縦に４組の単色プレス(ＢＢユニット)を積み重ねた型のカラーユニットである。通常は見当ずれをアンチファンアウトローラーや、版胴の位相を調節する見当合わせ機構で調整しているが、自動で紙継ぎが行なわれるペースター時は、紙継ぎ前後のテンションに大きな変動が発生するため、見当ずれ量も大きくなる。そのため、ペースター前後の一定部数は損紙として排除される。 On the other hand, when color printing is performed with a tower press, in each single color press, the newsprint paper absorbs dampening water and the paper stretches, so that there is a considerable misregistration between the first color and the second color. Among the misregistrations, the phenomenon in which the paper stretches in the direction perpendicular to the paper advance, that is, in the CD direction due to the blanket nip, is called fan-out because it spreads in a fan shape as it goes up. The tower press is a color unit in which four sets of single color presses (BB units) are stacked vertically. Normally, the misregistration is adjusted by an anti-fan-out roller or a registration mechanism that adjusts the phase of the plate cylinder, but when the paper is automatically spliced, a large fluctuation occurs in the tension before and after the splicing. For this reason, the amount of misregistration also increases. Therefore, a certain number of copies before and after the paster is excluded as waste paper.
近年は、新聞社でも損紙率の低減、使用資材の削減などの取り組みが進められているが、見当ずれの従来の対策は主に印刷装置面に関するものである。例えば、設定値以上の見当ずれを検知した時に、速やかに排紙する印刷装置が開示されている(特許文献２参照)。また、各種の見当ずれ修正方法と装置が開示されている(特許文献３、４、５、６、７、８、９参照)。また、オフセット印刷用ブランケット面の対策もある(特許文献１０参照)。更に予想ファンアウト量に対応させて色間見当を異ならせた版を製版する技術も開示されている(特許文献１１参照)。 In recent years, newspaper companies have been making efforts to reduce the percentage of paper loss and materials used, but the conventional measures for misregistration are mainly related to the printing apparatus. For example, a printing apparatus that quickly discharges paper when a misregistration greater than a set value is detected is disclosed (see Patent Document 2). Various misregistration correction methods and apparatuses are disclosed (see Patent Documents 3, 4, 5, 6, 7, 8, and 9). There is also a measure for the offset printing blanket surface (see Patent Document 10). Furthermore, a technique for making a plate with different color registration corresponding to the expected fan-out amount is also disclosed (see Patent Document 11).
新聞印刷用紙の面からの見当ずれ対策は少ないが、例えば、印刷用巻取り紙の浸水伸度のも最も大きい方向と紙の抄紙幅方向との角度の絶対値を15度以下にする技術が開示されている(特許文献１２参照)。該特許文献に記載の発明でも、見当ずれの少ない新聞印刷用紙を製造できるが、この文献中に記載の評価方法では、試料のサンプリングや測定に長時間を要するという問題があった。 There are few countermeasures against misregistration from the surface of newspaper printing paper, but for example, there is a technology that makes the absolute value of the angle between the direction of the greatest winding elongation of a printing web and the paper width direction of paper 15 degrees or less. It is disclosed (see Patent Document 12). The invention described in the patent document can also produce newspaper printing paper with little misregistration, but the evaluation method described in this document has a problem that it takes a long time to sample and measure a sample.
本発明は、新聞オフセット輪転機の折り部における剣先詰りを短時間で評価できる方法と、新聞印刷用紙のCD方向の見当ずれ(ファンアウト)を短時間で評価できる方法を提供することにある。更なる課題は、本発明の評価方法により、剣先詰まりおよび／または紙のCD方向の見当ずれが少ないオフセット印刷用新聞用紙を開発し、これを提供することにある。 An object of the present invention is to provide a method capable of evaluating in a short time the clogging of a sword tip at a folded portion of a newspaper offset rotary press and a method capable of evaluating a misregistration (fan-out) of newspaper printing paper in the CD direction in a short time. A further object is to develop and provide a newsprint for offset printing with less sword clogging and / or misregistration in the CD direction of the paper by the evaluation method of the present invention.
濡れ膨張測定器を用い、23℃、50%RHの条件で調湿したオフセット印刷用新聞用紙の断裁片を測定試料とし、4.0N/60mmの引張応力下、該測定試料の片面に蒸留水、真水(水道水)、エッチ液のいずれか１つの測定液を接触させ、1.2秒後のMD方向(縦方向)の初期湿潤伸び率を測定し、オフセット印刷用新聞用紙の剣先詰りを評価する。この初期湿潤伸び率が0.01〜0.2%であるオフセット印刷用新聞用紙は、剣先詰まりが少ない。また、濡れ膨張測定器を用い、23℃、50%RHの条件で調湿したオフセット印刷用新聞用紙の断裁片を測定試料とし、2.0N/60mmの引張応力下、該測定試料の片面に蒸留水、真水(水道水)、エッチ液のいずれか１つの測定液を接触させ、1.2秒後のCD方向(横方向)の初期湿潤伸び率を測定し、オフセット印刷用新聞用紙のCD方向の見当ずれを評価する。この初期湿潤伸び率が0.1〜3.0%であるオフセット印刷用新聞用紙は、見当ずれが少ない。 Using a wet expansion measuring instrument, a cut piece of newsprint for offset printing that was conditioned at 23 ° C. and 50% RH as a measurement sample, distilled water on one side of the measurement sample under a tensile stress of 4.0 N / 60 mm, Contact with any one of fresh water (tap water) or etchant, measure the initial wet elongation in the MD direction (longitudinal direction) after 1.2 seconds, and evaluate clogging of newsprint paper for offset printing. The newsprint for offset printing having an initial wet elongation of 0.01 to 0.2% is less clogged with a sword. In addition, using a wetting and expansion measuring instrument, a cut piece of newsprint for offset printing that was conditioned at 23 ° C and 50% RH was used as the measurement sample, and distilled on one side of the measurement sample under a tensile stress of 2.0 N / 60 mm. Contact with any one of water, fresh water (tap water), etchant, measure the initial wet elongation in the CD direction (lateral direction) after 1.2 seconds, and register the offset printing newsprint in the CD direction Evaluate the deviation. The offset printing newsprint with an initial wet elongation of 0.1 to 3.0% has little misregistration.
本発明の評価方法により、新聞オフセット輪転機の折り部における剣先詰り、新聞印刷用紙のCD方向の見当ずれ(ファンアウト)を短時間で評価できる。更に、本発明の評価方法により、剣先詰まりおよび／または紙のCD方向の見当ずれが少ないオフセット印刷用新聞用紙を開発し、これを提供できる。 According to the evaluation method of the present invention, it is possible to evaluate in a short time the clogging of the sword at the folded portion of the newspaper offset rotary press and the misregistration (fan-out) in the CD direction of newspaper printing paper. Further, the evaluation method of the present invention can develop and provide newsprint for offset printing with little clogging of the blade and / or misregistration in the CD direction of the paper.
本発明者らは、新聞オフセット輪転機の折り部における剣先詰りについて鋭意検討した。一般的に、輪転機はサテライト、タワープレスなどのカラーユニットと墨単色プレスの組み合わせで構成されている。4色カラーユニットで印刷される場合と単色プレスで印刷される場合では、湿し水の吸水量が異なるため、印刷後の紙の伸びの状態も大きく異なっていると考えられる。オフセット輪転機では、走行紙は各プレスで印刷された後、走行紙の走行方向を変えるためのターンバーや重ね順の変更や表裏反転に用いられるベイウインドーローラーにより、8〜10枚重ね合わされたあと、折り部へと送られる。その際、各々の紙の伸びに差があると、テンションに差が生じるため、フォーマー上でしわ入り、ばたつきが発生し、紙詰り(剣先詰まり)が発生し易くなると考えられる。 The present inventors diligently studied clogging of the sword at the folding portion of a newspaper offset rotary press. Generally, a rotary press is composed of a combination of a color unit such as a satellite or a tower press and a black ink color press. When printing with a four-color unit and when printing with a single-color press, the amount of water absorbed by the dampening water is different, so the state of elongation of the paper after printing is considered to be greatly different. In the offset rotary press, the running paper is printed by each press, and then 8 to 10 sheets are superposed by a turn bar for changing the running direction of the running paper, a bay window roller used for changing the stacking order and turning the front and back. After that, it is sent to the folding part. At that time, if there is a difference in the elongation of each paper, a difference in tension occurs, so that wrinkles and fluttering occur on the former, and it is considered that paper jams (sword clogs) are likely to occur.
オフセット輪転機で、両出し12万部／時（片出し6万部／時）で印刷される場合、用紙の走行速度は、約9m／秒となり、各プレスの一胴目から折り機までの距離は約10m程度であるから、到達するまでの時間はおよそ1.0〜1.2秒程度となる。 When printing on an offset rotary press with 120,000 copies / hour on both sides (60,000 copies / hour on one side), the paper travel speed is about 9m / second, from the first roll of each press to the folding machine. Since the distance is about 10 m, the time to reach is about 1.0 to 1.2 seconds.
本発明者らは、オフセット輪転印刷時の剣先詰まりの発生は、紙の片面から水を漬けたときの1.2秒後のMD方向の伸びと密接に関係していること、このMD方向の伸びを濡れ膨張測定器(商品名：ウェットストレッチダイナミック分析計、ミューテック社製)で測定できることを見出し、本発明を完成した。 The present inventors have confirmed that the occurrence of clogging at the time of offset rotary printing is closely related to the elongation in the MD direction after 1.2 seconds when water is immersed from one side of the paper. The present invention was completed by discovering that it can be measured with a wet expansion measuring device (trade name: Wet Stretch Dynamic Analyzer, manufactured by Mutech).
濡れ膨張測定器を用いたオフセット印刷用新聞用紙の剣先詰まり評価方法について説明する。オフセット印刷用新聞用紙の測定試料は、MD方向200mm×CD方向60mmである。この試料を23℃、50%RHで調湿した後、供試する。4.0N/60mmの引張応力下、試料の片面から水を接触させる。この水としては、蒸留水、真水(水道水)、エッチ液のいずれか１種類が使用される。試料と水が接触後、1.2秒後のMD方向の初期湿潤伸びを測定する。 A method for evaluating the clogging of newsprint paper for offset printing using a wet expansion measuring device will be described. The measurement sample of newsprint for offset printing is MD direction 200 mm × CD direction 60 mm. The sample is conditioned at 23 ° C. and 50% RH and then tested. Water is brought into contact with one side of the sample under a tensile stress of 4.0 N / 60 mm. As this water, any one of distilled water, fresh water (tap water), and etchant is used. After contact of the sample and water, the initial wet elongation in the MD direction after 1.2 seconds is measured.
また、前記の濡れ膨張測定器による剣先詰まりの評価方法で、オフセット印刷用新聞用紙のMD方向の初期湿潤伸びが1.2秒後に0.01〜0.2%であれば、剣先詰まりが少なくなることを見出した。MD方向の初期湿潤伸びを0.01%よりも低くすることは極めて困難である。更に、1μｌの点滴吸水度が10秒以上であればその効果が一層助長されることを見出した。 Further, in the evaluation method of sword clogging by the wet expansion measuring device, it has been found that sword clogging is reduced when the initial wet elongation in the MD direction of newspaper for offset printing is 0.01 to 0.2% after 1.2 seconds. It is extremely difficult to make the initial wet elongation in the MD direction lower than 0.01%. Furthermore, it has been found that the effect is further enhanced if the drip water absorption of 1 μl is 10 seconds or more.
オフセット印刷用新聞用紙のMD方向の1.2秒後の初期湿潤伸びを調整するには、パルプ原料配合面では機械パルプまたはNKPの増配が有効であり、薬品配合の面では湿潤紙力増強剤、内添サイズ剤の添加が有効であり、外添サイズ剤添加も有効である。また、抄紙条件の面では、ジェット／ワイヤー比(J/W比)の調整でMD方向へのパルプ繊維配向を強めることが有効である。 In order to adjust the initial wet elongation after 1.2 seconds in the MD direction of newsprint for offset printing, it is effective to increase the distribution of mechanical pulp or NKP on the pulp raw material blend side, and the wet paper strength enhancer on the chemical blend side. The addition of an additive sizing agent is effective, and the addition of an external sizing agent is also effective. In terms of papermaking conditions, it is effective to increase the pulp fiber orientation in the MD direction by adjusting the jet / wire ratio (J / W ratio).
本発明の剣先詰まりの少ないオフセット印刷用新聞用紙の抄造に用いられる抄紙機は、両面脱水機構を有しているギャップフォーマー、ハイブリッドフォーマー、オントップフォーマーなどが望ましいが、これに限定されるものではない。また、酸性抄紙、中性抄紙の何れでも良い。 The paper machine used for making newsprint for offset printing according to the present invention, which is less clogged with a sword, is preferably a gap former having a double-side dewatering mechanism, a hybrid former, an on-top former, etc., but is not limited thereto. It is not something. Either acidic papermaking or neutral papermaking may be used.
また、パルプ原料としては、とくに限定されるものではなく、グランドウッドパルプ(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)、脱墨パルプ(DIP)、針葉樹クラフトパルプ(NKP)など、一般的に抄紙原料として使用されているものであればよいが、機械パルプやNKPを多く配合することが好ましい。 In addition, the pulp raw material is not particularly limited, Grandwood pulp (GP), thermomechanical pulp (TMP), chemithermomechanical pulp (CTMP), deinked pulp (DIP), softwood kraft pulp (NKP) However, it is preferable to add a large amount of mechanical pulp or NKP.
配合する填料としては、炭酸カルシウム、クレー、カオリン、ホワイトカーボン、酸化チタン、合成樹脂(塩化ビニル樹脂、ポリスチレン樹脂、尿素ホルマリン樹脂)などの一般に使用されている填料であれば良く、填料の含有率にも特に限定はない。 The filler to be blended may be any commonly used filler such as calcium carbonate, clay, kaolin, white carbon, titanium oxide, synthetic resin (vinyl chloride resin, polystyrene resin, urea formalin resin), and the content of the filler There is no particular limitation.
また、必要に応じて、ロジンサイズ剤、ロジンエマルジョンサイズ剤、アルキルケテンダイマー、アルケニルコハク酸無水物などの内添サイズ剤、ポリアクリルアミド系高分子、ポリビニルアルコール系高分子、カチオン化澱粉、尿素／ホルマリン樹脂、メラミン／ホルマリン樹脂などの紙力増強剤、アクリルアミド／アミノメチルアクリルアミド共重合物の塩、カチオン化澱粉、ポリエチレンイミン、ポリエチレンオキサイド、アクリルアミド／アクリル酸ナトリウム共重合物などのろ水性あるいは歩留まり向上剤、紫外線防止剤、退色防止剤などの助剤を含有してもよい。 In addition, rosin sizing agents, rosin emulsion sizing agents, alkyl ketene dimers, alkenyl succinic anhydride and other internal sizing agents, polyacrylamide polymers, polyvinyl alcohol polymers, cationized starch, urea / Paper strength enhancer such as formalin resin, melamine / formalin resin, salt of acrylamide / aminomethylacrylamide copolymer, cationized starch, polyethyleneimine, polyethylene oxide, acrylamide / sodium acrylate copolymer, etc. An auxiliary agent such as an agent, an ultraviolet ray inhibitor and a fading inhibitor may be contained.
更に、澱粉、酸化澱粉、エステル化澱粉、エーテル化澱粉、カチオン化澱粉などの澱粉類、ポリアクリルアミド、ポリビニルアルコールなどの表面処理剤を塗布してもよい。また、スチレン／アクリル酸共重合体、スチレン／（メタ）アクリル酸重合体（なお、（メタ）アクリル酸は、「アクリル酸、および／またはメタクリル酸」を意味する。）、スチレン／（メタ）アクリル酸／（メタ）アクリル酸エステル共重合体、スチレン／マレイン酸共重合体、スチレン／マレイン酸半エステル共重合体、スチレン／マレイン酸エステル共重合体、エチレン／アクリル酸共重合体、イソブチレン／アクリル酸共重合体、ｎ−ブチレン／（メタ）アクリル酸／（メタ）アクリル酸エステル共重合体、プロピレン／マレイン酸共重合体、エチレン／マレイン酸共重合体などの表面サイズ剤を塗布してもよい。 Furthermore, starches such as starch, oxidized starch, esterified starch, etherified starch, and cationized starch, and surface treatment agents such as polyacrylamide and polyvinyl alcohol may be applied. Further, styrene / acrylic acid copolymer, styrene / (meth) acrylic acid polymer (note that (meth) acrylic acid means “acrylic acid and / or methacrylic acid”), styrene / (meth). Acrylic acid / (meth) acrylic acid ester copolymer, styrene / maleic acid copolymer, styrene / maleic acid half ester copolymer, styrene / maleic acid ester copolymer, ethylene / acrylic acid copolymer, isobutylene / A surface sizing agent such as acrylic acid copolymer, n-butylene / (meth) acrylic acid / (meth) acrylic acid ester copolymer, propylene / maleic acid copolymer, ethylene / maleic acid copolymer is applied. Also good.
また、本発明者らは新聞印刷用紙のCD方向の見当ずれ(ファンアウト)について鋭意検討した結果、オフセット輪転印刷時のCD方向の見当ずれ(ファンアウト)は、紙の片面から水を漬けたときの1.2秒後のCD方向の伸びと密接に関係していること、このCD方向の伸びを濡れ膨張測定器(商品名：ウェットストレッチダイナミック分析計、ミューテック社製)で測定できることを見出し、本発明を完成した。 In addition, as a result of intensive studies on the misregistration (fan-out) of newspaper printing paper in the CD direction, the present inventors found that the misregistration (fan-out) in the CD direction during offset rotary printing dipped water from one side of the paper. It is found that it is closely related to the elongation in the CD direction after 1.2 seconds, and that the elongation in the CD direction can be measured with a wet expansion measuring device (product name: wet stretch dynamic analyzer, manufactured by Mutek) The present invention has been completed.
濡れ膨張測定器を用いたオフセット印刷用新聞用紙のCD方向の見当ずれ(ファンアウト)評価方法について説明する。オフセット印刷用新聞用紙の測定試料は、MD方向60mm×CD方向200mmである。この試料を23℃、50%RHで調湿した後、供試する。2.0N/60mmの引張応力下、試料の片面から水を接触させる。この水としては、蒸留水、真水(水道水)、エッチ液のいずれか１種類が使用される。試料と水が接触後、1.2秒後のCD方向の初期湿潤伸びを測定する。 A method of evaluating offset (fan-out) in the CD direction of newsprint for offset printing using a wetting expansion measuring device will be described. A measurement sample of newsprint for offset printing is MD direction 60 mm × CD direction 200 mm. The sample is conditioned at 23 ° C. and 50% RH and then tested. Water is brought into contact with one side of the sample under a tensile stress of 2.0 N / 60 mm. As this water, any one of distilled water, fresh water (tap water), and etchant is used. The initial wet elongation in the CD direction is measured after 1.2 seconds after contact between the sample and water.
また、前記の濡れ膨張測定器によるCD方向の見当ずれの評価方法で、オフセット印刷用新聞用紙のCD方向の初期湿潤伸びが1.2秒後に0.1〜3.0%であれば、CD方向のファンアウトが問題ない範囲に抑えられることを見出した。CD方向の初期湿潤伸びを0.1%よりも低くすることは極めて困難である。更に、1μｌの点滴吸水度が10秒以上であればその効果が一層助長されることを見出した。 In addition, if the initial wet elongation in the CD direction of the newspaper for offset printing is 0.1 to 3.0% after 1.2 seconds in the evaluation method of the registration error in the CD direction by the wet expansion measuring device, the fan-out in the CD direction is a problem. It was found that it can be suppressed to a range that does not exist. It is extremely difficult to make the initial wet elongation in the CD direction lower than 0.1%. Furthermore, it has been found that the effect is further enhanced if the drip water absorption of 1 μl is 10 seconds or more.
オフセット印刷用新聞用紙のCD方向の1.2秒後の初期湿潤伸びを調整するには、パルプ原料配合面では機械パルプまたはNKPの増配が有効であり、薬品配合の面では湿潤紙力増強剤、内添サイズ剤の添加が有効であり、外添サイズ剤添加も有効である。また、抄紙条件の面では、ジェット／ワイヤー比(J/W比)の調整でMD方向へのパルプ繊維配向を弱めることが有効である。 In order to adjust the initial wet elongation after 1.2 seconds in the CD direction of newsprint for offset printing, it is effective to increase the distribution of mechanical pulp or NKP on the pulp material blending side, and the wet paper strength enhancer on the chemical blending side. The addition of an additive sizing agent is effective, and the addition of an external sizing agent is also effective. In terms of papermaking conditions, it is effective to weaken the pulp fiber orientation in the MD direction by adjusting the jet / wire ratio (J / W ratio).
本発明のCD方向の見当ずれが少ないオフセット印刷用新聞用紙の抄造に用いられる抄紙機は、両面脱水機構を有しているギャップフォーマー、ハイブリッドフォーマー、オントップフォーマーなどが望ましいが、これに限定されるものではない。また、酸性抄紙、中性抄紙の何れでも良い。 As the paper machine used for making newsprint for offset printing with little misregistration in the CD direction of the present invention, a gap former, a hybrid former, an on-top former, etc. having a double-side dewatering mechanism are desirable. It is not limited to. Either acidic papermaking or neutral papermaking may be used.
また、パルプ原料としては、とくに限定されるものではなく、グランドウッドパルプ(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)、脱墨パルプ(DIP)、針葉樹クラフトパルプ(NKP)など、一般的に抄紙原料として使用されているものであればよいが、機械パルプやNKPを多く配合することが好ましい。 In addition, the pulp raw material is not particularly limited, Grandwood pulp (GP), thermomechanical pulp (TMP), chemithermomechanical pulp (CTMP), deinked pulp (DIP), softwood kraft pulp (NKP) However, it is preferable to add a large amount of mechanical pulp or NKP.
配合する填料としては、炭酸カルシウム、クレー、カオリン、ホワイトカーボン、酸化チタン、合成樹脂(塩化ビニル樹脂、ポリスチレン樹脂、尿素ホルマリン樹脂)などの一般に使用されている填料であれば良く、填料の含有率にも特に限定はない。 The filler to be blended may be any commonly used filler such as calcium carbonate, clay, kaolin, white carbon, titanium oxide, synthetic resin (vinyl chloride resin, polystyrene resin, urea formalin resin), and the content of the filler There is no particular limitation.
また、必要に応じて、ロジンサイズ剤、ロジンエマルジョンサイズ剤、アルキルケテンダイマー、アルケニルコハク酸無水物などの内添サイズ剤、ポリアクリルアミド系高分子、ポリビニルアルコール系高分子、カチオン化澱粉、尿素／ホルマリン樹脂、メラミン／ホルマリン樹脂などの紙力増強剤、アクリルアミド／アミノメチルアクリルアミド共重合物の塩、カチオン化澱粉、ポリエチレンイミン、ポリエチレンオキサイド、アクリルアミド／アクリル酸ナトリウム共重合物などのろ水性あるいは歩留まり向上剤、紫外線防止剤、退色防止剤などの助剤を含有してもよい。 In addition, rosin sizing agents, rosin emulsion sizing agents, alkyl ketene dimers, alkenyl succinic anhydride and other internal sizing agents, polyacrylamide polymers, polyvinyl alcohol polymers, cationized starch, urea / Paper strength enhancer such as formalin resin, melamine / formalin resin, salt of acrylamide / aminomethylacrylamide copolymer, cationized starch, polyethyleneimine, polyethylene oxide, acrylamide / sodium acrylate copolymer, etc. An auxiliary agent such as an agent, an ultraviolet ray inhibitor and a fading inhibitor may be contained.
更に、澱粉、酸化澱粉、エステル化澱粉、エーテル化澱粉、カチオン化澱粉などの澱粉類、ポリアクリルアミド、ポリビニルアルコールなどの表面処理剤を塗布してもよい。また、スチレン／アクリル酸共重合体、スチレン／（メタ）アクリル酸重合体（なお、（メタ）アクリル酸は、「アクリル酸、および／またはメタクリル酸」を意味する。）、スチレン／（メタ）アクリル酸／（メタ）アクリル酸エステル共重合体、スチレン／マレイン酸共重合体、スチレン／マレイン酸半エステル共重合体、スチレン／マレイン酸エステル共重合体、エチレン／アクリル酸共重合体、イソブチレン／アクリル酸共重合体、ｎ−ブチレン／（メタ）アクリル酸／（メタ）アクリル酸エステル共重合体、プロピレン／マレイン酸共重合体、エチレン／マレイン酸共重合体などの表面サイズ剤を塗布してもよい。 Furthermore, starches such as starch, oxidized starch, esterified starch, etherified starch, and cationized starch, and surface treatment agents such as polyacrylamide and polyvinyl alcohol may be applied. Further, styrene / acrylic acid copolymer, styrene / (meth) acrylic acid polymer (note that (meth) acrylic acid means “acrylic acid and / or methacrylic acid”), styrene / (meth). Acrylic acid / (meth) acrylic acid ester copolymer, styrene / maleic acid copolymer, styrene / maleic acid half ester copolymer, styrene / maleic acid ester copolymer, ethylene / acrylic acid copolymer, isobutylene / A surface sizing agent such as acrylic acid copolymer, n-butylene / (meth) acrylic acid / (meth) acrylic acid ester copolymer, propylene / maleic acid copolymer, ethylene / maleic acid copolymer is applied. Also good.
剣先詰まりが少なく、かつCD方向の見当ずれ(ファンアウト)が少ないオフセット印刷用新聞用紙の製造に際しては、J/W比を除く他の製造条件は前記の剣先詰まりが少ないオフセット印刷用新聞用紙またはCD方向の見当ずれの少ないオフセット印刷用新聞用紙と同様である。J/W比に関しては、MD方向の初期湿潤伸びとCD方向の初期湿潤伸びとを両立させることは不可能である。 When manufacturing newsprints for offset printing with little sword clogging and little CD direction misregistration (fan-out), the other production conditions except for the J / W ratio are the above-mentioned newsprint for offset printing with little sword clogging or This is the same as newsprint for offset printing with little misregistration in the CD direction. Regarding the J / W ratio, it is impossible to achieve both the initial wet elongation in the MD direction and the initial wet elongation in the CD direction.
以下に、本発明を実施例により詳細に説明するが、本発明はこれに限定されるものではない。初期湿潤伸び、点滴吸水度、剣先詰まり回数、見当ずれの測定方法は次のとおりである。
（１）初期湿潤伸び測定方法
剣先詰まり評価：23℃、50%RHで調湿後、MD200mm×CD60mmに断裁した試験片のMD方向について、濡れ膨張測定器（商品名ウェットストレッチダイナミック分析計、ミューテック製）で、測定液として蒸留水を用い、引張応力4.0N/60mmのもと、初期湿潤伸びを測定した。
CD方向の見当ずれ評価：23℃、50%RHで調湿後、MD60mm×CD200mmに断裁した試験片のCD方向について、濡れ膨張測定器（商品名ウェットストレッチダイナミック分析計、ミューテック製）で、測定液として蒸留水を用い、引張応力2.0N/60mmのもと、初期湿潤伸びを測定した。
（２）点滴吸水度測定方法
Japan TAPPI No.33に準拠し、1μｌでの点滴吸水度を測定した。
（３）剣先詰り回数測定方法
三菱重工製の新聞オフセット輪転機を用い、両出し12万部／時の印刷速度で印刷を行ない、6時間の間に、折り部で剣先詰りが発生する回数を測定した。
（４）見当ずれ(ファンアウト)量測定方法
三菱重工製の新聞オフセット輪転機を用い、両出し12万部／時の印刷速度で4色印刷(刷順：紅→藍→黄→墨)を行い、ペースター(自動紙継ぎ)直前とペースター後100部目で、それぞれ1色目と4色目の見当マーク位置のCD方向の差を測定した。ペースター前後の差が0.1mm未満を◎、0.1以上0.2mm未満を○、0.2mm以上を×とした。
Hereinafter, the present invention will be described in detail by way of examples, but the present invention is not limited thereto. The measurement method of initial wet elongation, drip water absorption, number of blade clogs, and misregistration is as follows.
(1) Initial wet elongation measurement method Cutter tip clogging evaluation: Wet expansion measuring instrument (trade name Wet Stretch Dynamic Analyzer, Mu) for the MD direction of the specimen cut into MD200mm x CD60mm after conditioning at 23 ° C and 50% RH (Manufactured by Tec Co., Ltd.), the initial wet elongation was measured under a tensile stress of 4.0 N / 60 mm using distilled water as a measuring solution.
Evaluation of misregistration in the CD direction: After adjusting the humidity at 23 ° C and 50% RH, for the CD direction of the test piece cut to MD60mm x CD200mm, with a wetting expansion measuring instrument (trade name Wet Stretch Dynamic Analyzer, manufactured by Mutech) Distilled water was used as the measurement liquid, and the initial wet elongation was measured under a tensile stress of 2.0 N / 60 mm.
(2) Drip water absorption measurement method
In accordance with Japan TAPPI No.33, the drip water absorption at 1 μl was measured.
(3) How to measure the number of sword clogs Use a newspaper web offset press manufactured by Mitsubishi Heavy Industries to perform printing at a printing speed of 120,000 copies per hour. It was measured.
(4) Misregistration (fan-out) amount measurement method Using a newspaper offset rotary press manufactured by Mitsubishi Heavy Industries, printing 4 colors at a printing speed of 120,000 copies / hour (print order: red → indigo → yellow → black) The CD direction difference between the registration marks of the first and fourth colors was measured immediately before the paster (automatic splicing) and at the 100th copy after the paster. The difference between the front and back of the paster is less than 0.1 mm, ◯, 0.1 to less than 0.2 mm, and 0.2 mm or more as x.
[実施例１]
製紙用原料パルプとして、新聞脱墨パルプ(ろ水度150mlCSF)、TMP(ろ水度80mlCSF)、NKP（ろ水度500mlCSF）を70：25：5重量%の配合割合で混合したパルプスラリーに、填料としてパルプ絶乾重量当たりホワイトカーボンを1.0重量%、ポリアミドエピクロロヒドリン系湿潤紙力向上剤を0.10重量%添加して紙料を調製した。この紙料を用いて、ギャップフォーマー型抄紙機で抄速1000m／分、J/W比を100%とし、坪量43g/m2の新聞用紙原紙を抄造し、さらにオンマシンのゲートロールコーターで澱粉を塗工量がフェルト面0.18g/m2、ワイヤー面0.16g/m2、サイズ剤を塗工量がフェルト面、ワイヤー面ともに0.05g/m2となるように塗工し、オフセット印刷用新聞用紙を得た。このオフセット印刷用新聞用紙について、先に示した方法にて、初期湿潤伸び、1μｌの点滴吸水度、オフセット印刷時の剣先詰り回数を測定し、結果を表１に示した。
[Example 1]
As a pulp for papermaking, newspaper deinked pulp (freezing degree 150mlCSF), TMP (freezing degree 80mlCSF), NKP (freezing degree 500mlCSF) mixed with 70: 25: 5 wt% blending slurry, A paper material was prepared by adding 1.0% by weight of white carbon and 0.10% by weight of a polyamide epichlorohydrin-based wet paper strength improver as a filler. Using this paper, a gap former type paper machine is used to produce newsprint base paper with a basis weight of 43 g / m 2 with a paper making speed of 1000 m / min, a J / W ratio of 100%, and an on-machine gate roll coater. in starch coating weight felt surface 0.18 g / m 2, wire side 0.16 g / m 2, sizing the coated amount is felt surface, was applied so that the 0.05 g / m 2 on both wire side, the offset I got newsprint for printing. With respect to this newsprint for offset printing, initial wet elongation, 1 μl drip water absorbency, and the number of times of sword clogging during offset printing were measured by the methods described above, and the results are shown in Table 1.
[実施例２]
ポリアミドエピクロロヒドリン系湿潤強度向上剤を0.05重量%添加し、サイズ剤の塗工量をフェルト面、ワイヤー面ともに0.06g/m2とした以外は実施例１と同様の方法でオフセット印刷用新聞用紙を製造した。この用紙について先に示した方法にて、初期湿潤伸び、1μｌの点滴吸水度、オフセット印刷時の剣先詰り回数を測定し、結果を表１に示した。
[Example 2]
For offset printing in the same manner as in Example 1 except that 0.05 wt% of polyamide epichlorohydrin wet strength improver was added and the coating amount of the sizing agent was changed to 0.06 g / m 2 for both the felt surface and the wire surface. Made newsprint. The initial wet elongation, 1 μl drip water absorbency, and the number of blade cloggings during offset printing were measured for this paper by the method described above, and the results are shown in Table 1.
[実施例３]
ポリアミドエピクロロヒドリン系湿潤強度向上剤を0.01重量%添加し、サイズ剤の塗工量をフェルト面、ワイヤー面ともに0.02g/m2とした以外は実施例１と同様の方法でオフセット印刷用新聞用紙を製造した。この用紙について先に示した方法にて、初期湿潤伸び、1μｌの点滴吸水度、オフセット印刷時の剣先詰り回数を測定し、結果を表１に示した。
[Example 3]
For offset printing in the same manner as in Example 1 except that 0.01% by weight of polyamide epichlorohydrin wet strength improver was added and the coating amount of the sizing agent was changed to 0.02 g / m 2 for both the felt surface and the wire surface. Made newsprint. The initial wet elongation, 1 μl drip water absorbency, and the number of blade cloggings during offset printing were measured for this paper by the method described above, and the results are shown in Table 1.
[比較例１]
ポリアミドエピクロロヒドリン系湿潤強度向上剤を0.0005重量%添加し、サイズ剤の塗工量をフェルト面、ワイヤー面ともに0.05g/m2とした以外は実施例１と同様の方法でオフセット印刷用新聞用紙を製造した。この用紙について先に示した方法にて、初期湿潤伸び、１μｌの点滴吸水度、オフセット印刷時の剣先詰り回数を測定し、結果を表１に示した。
[Comparative Example 1]
For offset printing in the same manner as in Example 1, except that 0.0005% by weight of polyamide epichlorohydrin wet strength improver was added and the coating amount of the sizing agent was changed to 0.05 g / m 2 for both the felt surface and the wire surface. Made newsprint. The initial wet elongation, 1 μl drip water absorption, and the number of times of sword clogging during offset printing were measured for this paper by the method described above, and the results are shown in Table 1.
[比較例２]
ポリアミドエピクロロヒドリン系湿潤強度向上剤を無添加とし、サイズ剤の塗工量をフェルト面、ワイヤー面ともに0.02g/m2とした以外は実施例１と同様の方法でオフセット印刷用新聞用紙を製造した。この用紙について先に示した方法にて、初期湿潤伸び、1μｌの点滴吸水度、オフセット印刷時の剣先詰り回数を測定し、結果を表１に示した。
[Comparative Example 2]
Newsprint paper for offset printing in the same manner as in Example 1 except that no polyamide epichlorohydrin wet strength improver was added and the coating amount of the sizing agent was 0.02 g / m 2 for both the felt surface and the wire surface. Manufactured. The initial wet elongation, 1 μl drip water absorbency, and the number of blade cloggings during offset printing were measured for this paper by the method described above, and the results are shown in Table 1.
[比較例３]
ポリアミドエピクロロヒドリン系湿潤強度向上剤を無添加とし、サイズ剤の塗工量をフェルト面、ワイヤー面ともに0.01g/m2とした以外は実施例１と同様の方法でオフセット印刷用新聞用紙を製造した。この用紙について先に示した方法にて、初期湿潤伸び、1μｌの点滴吸水度、オフセット印刷時の剣先詰り回数を測定し、結果を表１に示した。
[Comparative Example 3]
Newsprint paper for offset printing in the same manner as in Example 1 except that the polyamide epichlorohydrin wet strength improver was not added and the coating amount of the sizing agent was changed to 0.01 g / m 2 for both the felt surface and the wire surface. Manufactured. The initial wet elongation, 1 μl drip water absorbency, and the number of blade cloggings during offset printing were measured for this paper by the method described above, and the results are shown in Table 1.
前記の表１に示した結果において、初期湿潤伸びの結果と剣先詰り回数を対比してわかるように、初期湿潤伸びが0.2%以下の場合、剣先詰りの発生が少ない。このことから、本発明の濡れ膨張測定器による初期湿潤伸び率の測定は、新聞オフセット輪転機の折り部での剣先詰りの評価方法として有効であることがわかる。また、初期湿潤伸びを0.01〜0.20%以下としたオフセット印刷用新聞用紙は、オフセット輪転機の折り部での剣先詰りが抑制されることがわかる。 In the results shown in Table 1 above, as can be seen by comparing the result of initial wet elongation and the number of times of sword clogging, when the initial wet elongation is 0.2% or less, occurrence of sword clogging is small. From this, it can be seen that the measurement of the initial wet elongation rate by the wet expansion measuring device of the present invention is effective as an evaluation method for clogging of a sword tip at a folded portion of a newspaper offset rotary press. Further, it can be seen that newsprint paper for offset printing with an initial wet elongation of 0.01 to 0.20% or less suppresses clogging of the sword at the folding portion of the offset rotary press.
[実施例４]
製紙用原料パルプとして、新聞脱墨パルプ(ろ水度150mlCSF)、TMP(ろ水度80mlCSF)、NKP(ろ水度500mlCSF)を70：25：5重量%の配合割合で混合したパルプスラリーに、填料としてパルプ絶乾重量当たりホワイトカーボンを1.0重量%、ポリアミドエピクロロヒドリン系湿潤紙力向上剤を0.10重量%添加して紙料を調製した。この紙料を用いて、ギャップフォーマー型抄紙機で抄速1000m／分、J/W比を100%とし、坪量43g/m2の新聞用紙原紙を抄造し、さらにオンマシンのゲートロールコーターで澱粉を塗工量がフェルト面0.18g/m2、ワイヤー面0.16g/m2、サイズ剤を塗工量がフェルト面、ワイヤー面ともに0.05g/m2となるように塗工し、オフセット印刷用新聞用紙を得た。このオフセット印刷用新聞用紙について、先に示した方法にて、初期湿潤伸び、1μｌの点滴吸水度、オフセット印刷時の横方向の見当ずれ量を測定し、結果を表２に示した。
[Example 4]
As a pulp for papermaking, newspaper deinked pulp (freezing degree 150mlCSF), TMP (freezing degree 80mlCSF), NKP (freezing degree 500mlCSF) mixed with 70: 25: 5 wt% blending slurry, A paper material was prepared by adding 1.0% by weight of white carbon and 0.10% by weight of a polyamide epichlorohydrin-based wet paper strength improver as a filler. Using this paper, a gap former type paper machine was used to make a newsprint base paper with a basis weight of 43g / m 2 at a speed of 1000m / min, a J / W ratio of 100%, and an on-machine gate roll coater. in starch coating weight felt surface 0.18 g / m 2, wire side 0.16 g / m 2, sizing the coated amount is felt surface, was applied so that the 0.05 g / m 2 on both wire side, the offset I got newsprint for printing. With respect to this newsprint for offset printing, initial wet elongation, 1 μl drip water absorption, and lateral misregistration during offset printing were measured by the methods described above, and the results are shown in Table 2.
[実施例５]
ポリアミドエピクロロヒドリン系湿潤強度向上剤を0.05重量%添加し、サイズ剤の塗工量をフェルト面、ワイヤー面ともに0.06g/m2とした以外は実施例４と同様の方法でオフセット印刷用新聞用紙を製造した。この用紙について先に示した方法にて、初期湿潤伸び、1μｌの点滴吸水度、オフセット印刷時の横方向の見当ずれ量を測定し、結果を表２に示した。
[Example 5]
For offset printing in the same manner as in Example 4 except that 0.05 wt% of polyamide epichlorohydrin wet strength improver was added and the coating amount of the sizing agent was changed to 0.06 g / m 2 for both the felt surface and the wire surface. Made newsprint. This paper was measured for initial wet elongation, 1 μl drip water absorbency, and lateral misregistration during offset printing by the methods described above. The results are shown in Table 2.
[実施例６]
ポリアミドエピクロロヒドリン系湿潤強度向上剤を0.01重量%添加し、サイズ剤の塗工量をフェルト面、ワイヤー面ともに0.02g/m2とした以外は実施例４と同様の方法でオフセット印刷用新聞用紙を製造した。この用紙について先に示した方法にて、初期湿潤伸び、1μｌの点滴吸水度、オフセット印刷時の横方向の見当ずれ量を測定し、結果を表２に示した。
[Example 6]
For offset printing in the same manner as in Example 4 except that 0.01% by weight of a polyamide epichlorohydrin wet strength improver was added and the coating amount of the sizing agent was changed to 0.02 g / m 2 for both the felt surface and the wire surface. Made newsprint. This paper was measured for initial wet elongation, 1 μl drip water absorbency, and lateral misregistration during offset printing by the methods described above. The results are shown in Table 2.
[実施例７]
ポリアミドエピクロロヒドリン系湿潤強度向上剤を0.005重量%添加し、サイズ剤の塗工量をフェルト面、ワイヤー面ともに0.05g/m2とした以外は実施例４と同様の方法でオフセット印刷用新聞用紙を製造した。この用紙について先に示した方法にて、初期湿潤伸び、1μｌの点滴吸水度、オフセット印刷時の横方向の見当ずれ量を測定し、結果を表２に示した。
[Example 7]
For offset printing in the same manner as in Example 4 except that 0.005% by weight of polyamide epichlorohydrin wet strength improver was added and the coating amount of the sizing agent was changed to 0.05 g / m 2 for both the felt surface and the wire surface. Made newsprint. This paper was measured for initial wet elongation, 1 μl drip water absorbency, and lateral misregistration during offset printing by the methods described above. The results are shown in Table 2.
[比較例４]
ポリアミドエピクロロヒドリン系湿潤強度向上剤を無添加とし、サイズ剤の塗工量をフェルト面、ワイヤー面ともに0.02g/m2とした以外は実施例４と同様の方法でオフセット印刷用新聞用紙を製造した。この用紙について先に示した方法にて、初期湿潤伸び、1μｌの点滴吸水度、オフセット印刷時の横方向の見当ずれ量を測定し、結果を表２に示した。
[Comparative Example 4]
Newsprint paper for offset printing in the same manner as in Example 4 except that no polyamide epichlorohydrin wet strength improver was added and the coating amount of the sizing agent was changed to 0.02 g / m 2 for both the felt surface and the wire surface. Manufactured. This paper was measured for initial wet elongation, 1 μl drip water absorbency, and lateral misregistration during offset printing by the methods described above. The results are shown in Table 2.
[比較例５]
ポリアミドエピクロロヒドリン系湿潤強度向上剤を無添加とし、サイズ剤の塗工量をフェルト面、ワイヤー面ともに0.01g/m2とした以外は実施例４と同様の方法でオフセット印刷用新聞用紙を製造した。この用紙について先に示した方法にて、初期湿潤伸び、1μｌの点滴吸水度、オフセット印刷時の横方向の見当ずれ量を測定し、結果を表２に示した。
[Comparative Example 5]
Newsprint paper for offset printing in the same manner as in Example 4 except that the polyamide epichlorohydrin wet strength improver was not added and the sizing agent coating amount was 0.01 g / m 2 for both the felt surface and the wire surface. Manufactured. This paper was measured for initial wet elongation, 1 μl drip water absorbency, and lateral misregistration during offset printing by the methods described above. The results are shown in Table 2.
前記の表２に示した結果において、初期湿潤伸びの結果と見当ずれ量を対比してわかるように、水との接触から1.2秒後のCD方向の初期湿潤伸びが3.0%以下の場合、見当ずれ量が小さい。このことから、本発明の濡れ膨張測定器による初期湿潤伸び率の測定は、新聞オフセット輪転機の折り部でのタワープレスでの横方向の見当ずれ量の評価方法として有効であることがわかる。また、初期湿潤伸びを0.1〜3.0%としたオフセット印刷用新聞用紙は、オフセット輪転機の折り部での横方向の見当ずれが抑制されることがわかる。 In the results shown in Table 2 above, when the initial wet elongation in the CD direction after 1.2 seconds from contact with water is 3.0% or less, as shown by comparing the result of initial wet elongation with the amount of misregistration, there is no registration. The deviation is small. From this, it can be seen that the measurement of the initial wet elongation rate by the wet expansion measuring device of the present invention is effective as a method for evaluating the lateral misregistration amount at the tower press at the folded portion of the newspaper offset rotary press. Further, it can be seen that the offset printing newsprint with an initial wet elongation of 0.1 to 3.0% suppresses lateral misregistration at the folding portion of the offset rotary press.
１ 走行紙
２ のこ胴
３ 折り胴
４ ワリス
５ ドラッグローラー
６ フォーマー(三角板、剣先)
７ フォーミングローラー
８ ニッピングローラー
９ フォルデイングローラー
１０ デリバリーファン
１１ デリバリーベルト
１２ スリッターナイフ
１３ 転送ローラー
1 Running paper 2 Saw drum 3 Folding drum 4 Wallis 5 Drag roller 6 Former (triangular plate, sword tip)
7 Forming roller 8 Nipping roller 9 Folding roller 10 Delivery fan 11 Delivery belt 12
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| JP2007146333A (en) * | 2005-11-29 | 2007-06-14 | Daio Paper Corp | Newsprint paper |
| JP2007247075A (en) * | 2006-03-14 | 2007-09-27 | Nippon Paper Industries Co Ltd | Newsprint paper for offset printing, which has less paper break on printing and method for predicting the paper break |
| JP4854346B2 (en) * | 2006-03-20 | 2012-01-18 | 日本製紙株式会社 | Newsprint for offset printing and method for producing the same |
| JP4958677B2 (en) * | 2007-08-03 | 2012-06-20 | 大王製紙株式会社 | Newspaper and production method thereof |
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| JP2001262485A (en) * | 2000-01-12 | 2001-09-26 | Nippon Paper Industries Co Ltd | Newsprint |
| JP2002201266A (en) * | 1999-12-21 | 2002-07-19 | Sumitomo Chem Co Ltd | Water-soluble thermosetting resin and paper-strength- at-wet enhancer having this resin as effective component |
| JP2003027393A (en) * | 2001-07-16 | 2003-01-29 | Tokushu Paper Mfg Co Ltd | Water-resistant printing paper |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61146900A (en) * | 1984-12-17 | 1986-07-04 | 三井東圧化学株式会社 | Production of printing paper |
| JPH0657686A (en) * | 1992-07-31 | 1994-03-01 | New Oji Paper Co Ltd | Base paper for coated paper for web offset printing |
| JPH11133019A (en) * | 1997-10-24 | 1999-05-21 | Nippon Paper Industries Co Ltd | Method and device for measuring dynamic drainage resistance |
| JP2000052529A (en) * | 1998-08-12 | 2000-02-22 | Nippon Paper Industries Co Ltd | Method for selecting paper for multicolor lithography rotary press |
| JP2000064191A (en) * | 1998-08-12 | 2000-02-29 | Nippon Paper Industries Co Ltd | Paper for web press for multicolor litho printing |
| JP2002201266A (en) * | 1999-12-21 | 2002-07-19 | Sumitomo Chem Co Ltd | Water-soluble thermosetting resin and paper-strength- at-wet enhancer having this resin as effective component |
| JP2001262485A (en) * | 2000-01-12 | 2001-09-26 | Nippon Paper Industries Co Ltd | Newsprint |
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