JP2004218100A - Method for producing newsprint paper and newsprint paper - Google Patents
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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用紙、特に古紙パルプ（ＤＩＰ）配合比率の高い新聞用紙の製造方法に関し、詳しくは、オフセット印刷における紙粉等によるブランケットパイリングを効果的に防止し、インク着肉性にすぐれる新聞用紙の製造方法および新聞用紙に関するものである。
【０００２】
【従来の技術】
従来より、新聞用紙には、メカニカルパルプや古紙パルプを配合した紙が使用され、近年、環境保護の観点から古紙パルプの高率配合や、軽量化等が要請されている。
【０００３】
古紙原料は古新聞紙を主体とし、古新聞紙以外に非塗工紙、塗工紙等の広葉樹パルプを含有するチラシ等が数多く混入している。
【０００４】
そして、そのような古紙を新聞用紙の抄紙原紙として使用した配合、その配合量が多くなるに従って、灰分が増加し、紙の表面強度が低下する。
【０００５】
表面強度の弱い新聞用紙は、印刷時に紙の繊維や填料等がインキによって紙表面から剥離されて、印刷画像の白抜けやヒッキー等が発生し、それが起因となりブランケットパイリング等の印刷トラブルを発生させブランケットの頻繁な洗浄を余儀なくし、またインク壷のインク中に練りローラ、呼び出しローラを通じて紙の繊維や填料が混入してしまう等の現象も生じる。
【０００６】
上記のようなオフセット印刷時に用紙の表面強度が不十分なために発生する諸々の問題を解決する方法として、従来から新聞用紙の表裏面に澱粉、ＰＶＡ、ポリアクリルアミド等の高分子材料を成分とする表面処理剤を塗工することが一般に行われている。
【０００７】
【発明が解決しようとする課題】
上記諸々の問題は表面処理剤を塗布することによって大幅に解決することができたが、しかしこれは比較的小部数の印刷に限られ新聞印刷という大部数の印刷では依然として解決されていないのが実情である。
【０００８】
本発明の課題は、大部数の印刷においても紙粉、填料等によるトラブルがなく、またインク着肉性にすぐれた新聞用紙の製造方法を提供することである。
【０００９】
【課題を解決するための手段】
本発明者らは、種々検討してきた結果、上記諸々の問題は新聞用紙用の表面強度が表面、裏面とでかなり相違していることに起因していると考えた。すなわち、紙の表面強度は抄紙機のワイヤーパートやプレスパートの型式や乾燥条件によって、紙の表面と裏面とで差が生じる。
【００１０】
従って、本発明の課題は、表面強度を表面と裏面とでできるだけ近づけさせた新聞用紙の製造方法と、その新聞用紙を提供するものである。本発明の課題は下記（１）（２）（３）によって達成される。
【００１１】
（１） 原紙の表裏面に澱粉を主成分とする表面処理剤を塗布、乾燥する新聞用紙の製造方法において、表面と裏面とで表面処理剤の塗工量を個々に変え塗工することを特徴とする新聞用紙の製造方法。
【００１２】
（２） 原紙における古紙の配合率が３０〜１００重量％であることを特徴とする上記１記載の新聞用紙の製造方法。
【００１３】
（３） 澱粉を主成分とする表面処理剤の塗工量が表面、裏面それぞれ０．４〜３．０ｇ／ｍ２であることを特徴とする上記１または２記載の新聞用紙の製造方法。なお、表面強度は、例えば印刷適性試験機によって測定することができる。
【００１４】
（４）原紙の表裏面に澱粉を主成分とする表面処理剤を塗布、乾燥して得られる新聞用紙において、表面と裏面とで表面処理剤の塗工量を個々に変えて塗工してあることを特徴とする新聞用紙。
【００１５】
【発明の実施の形態】
以下、本発明をさらに詳細に説明する。
本発明は、古紙を原料とする再生パルプを配合した、好ましくは古紙を原料とする再生パルプを３０〜１００重量％配合した新聞用紙の製造において、紙の表面と裏面とで澱粉を主成分とする表面処理剤の濃度を個々に調整して、表面強度が弱い面に澱粉を主成分とする表面処理剤を多く塗工しようとするものである。より具体的には、紙の表裏面がそれぞれ所望の表面強度４〜５をもつように、紙の表面、裏面に別々に表面処理剤を塗工しようとするものである。
【００１６】
本発明でいう澱粉を主成分とする表面処理剤は、変性澱粉を主成分とする表面処理剤、澱粉含有型表面処理剤を含むものである。変性澱粉としては、特に限定されるものではなく、従来から知られている澱粉原料（例えば、トウモロコシ、馬鈴薯、タピオカ、小麦、米など）に酸化処理や酵素処理が施された澱粉が挙げられる。
【００１７】
本発明に係る原紙の主成分となるパルプ繊維としては、化学パルプ（ＮＢＫＰ、ＬＢＫＰ等）、繊維パルプ（ＤＩＰ等）など公知のものが適宜用される。
【００１８】
そして特に軽量でかつ古紙パルプ配合率の高い、具体的には３０〜１００重量％、好ましくは７０〜１００重量％の古紙パルプが含有される原紙が用いられる。
【００１９】
図１は、本発明の新聞用紙の製造方法の主要部（澱粉を主成分とする表面処理剤の塗工フロー）の概略を表したものである。
【００２０】
澱粉と清水はスターチ溶解タンク１から第１の澱粉糊化装置２及び第２の澱粉糊化装置３に導入される。便利上、第１の澱粉糊化装置２は紙の裏面用、第２の澱粉糊化装置３は紙の表面用の、それぞれの表面処理剤を調製するために設けられる。
【００２１】
これら澱粉糊化装置２，３には所望量の熱水が加えられて固形分濃度３〜２７重量％、好ましくは３〜２０重量％の表面処理剤に調製される。
【００２２】
ここで、第１、第２の澱粉糊化装置２，３で得られるそれぞれの表面処理剤の濃度は、これら装置に希釈水タンク１０から導入される熱水及び蒸気の量を加減することによって得ることができる。
【００２３】
第１及び第２の澱粉糊化装置２，３で調製されたそれぞれの表面処理剤は、高振動スクリーン４，５を通じて不溶解澱粉を除去した後、ファイナルタンク６，７に貯蔵され、ここから、走行紙（原紙）の表面、裏面に塗工される。
【００２４】
塗工前の原紙の裏面、表面のそれぞれの表面強度は図示されていない表面強度測定装置（試験機名：ＲＩ−２型印刷適性試験機／明製作所株式会社）で測定され、この測定値に基づいて表面処理剤の濃度が決められる。
【００２５】
本発明者らの検討したところによれば、紙の表面強度と表面処理剤の塗工量とはほぼ比例関係にあり、このため、塗工前の厚紙の表面強度を測定することにより、表面処理剤の塗工量の調整が行われる。
【００２６】
従来の技術では、先に指摘したとおり、紙の表面強度は紙の表面と裏面で差が生じているのにもかかわらず、サイズプレスに表面処理剤を供給するタンクは１つ（紙の表面と裏面が共有）であったため、同一濃度の表面処理剤を紙の表面と裏面に塗工しており、表面処理剤の塗工量も紙の表面と裏面で同一となっていた。
【００２７】
このため、新聞社で印刷時に紙粉トラブルやブランケットへのパイリングが発生した場合、トラブルが発生した面だけでなく、紙の両面の表面処理塗工量を増さざるを得ず、必要以上の表面処理剤塗工量となっていた。
【００２８】
表面処理剤の塗工量が多すぎると、印刷時に表面処理剤が溶出してオフセット印刷機のブランケットに付着してリレキによる印刷不良や、吸水により紙表面の粘着性が増加してブランケットに用紙がとられて断紙に至るケースがあり、表面処理剤は必要以上に塗工しないことが望ましい。
【００２９】
これに対して、本発明はサイズプレス供給用の表面処理剤タンクが紙の表面用、裏面用の２つを備え紙の表面と裏面で表面処理剤の塗工量を変えることが可能である。この結果、紙の表面強度が弱い面のみに表面処理剤の塗工量を増やすことができるようになる。いずれにしても、本発明の塗工量は紙の表面、裏面それぞれ０．４〜３．０ｇ／ｍ２、好ましくは０．４〜２．０ｇ／ｍ２の範囲である。
【００３０】
（表面強度の評価）
ＲＩ試験機（試験機名：ＲＩ−２型印刷適性試験機／明製作所株式会社）を用いて試験片に印刷を行い、印刷後の試験片の白抜けの状態を目視で確認した。評価基準は下記のとおりである。
【００３１】
１：紙片が相関剥離する、または破れる
２：紙片面積の５０％以上で白抜けが発生
３：紙片に白抜けが目立つ
４：紙片に白抜けが僅かに認められる
５：紙片に白抜けが見られない
【００３２】
【実施例】
以下に実施例を挙げて本発明をさらに詳細に説明する。勿論、本発明はこれら実施例に限定されるものではない。またここでの部及び％は特に断らない限り、それぞれ重量部及び重量％である。
【００３３】
（実施例１）
（原紙の作成）
針葉樹クラフトパルプ（ＮＢＫＰ）；１０％、サーモメカニズムパルプ（ＴＭＰ）； ２０％、グラウンドパルプ（ＧＰ）；５％、新聞脱墨古紙パルプ（ＤＩＰ）；６５％の比率構成になるパルプスラリを、レファイナで即解してフリーネス（ＣＳＦ）が１５０ ｍｌのパルプスラリを調製した。かくして得られたパルプスラリ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：ＡＬ−１２０／日本ＰＭＣ株式会社）０．２％、硫酸バンド１．５％及び填量として水和珪酸を紙灰分で１．５％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４４ｇ／ｍ２の原紙を得た。
【００３４】
なお、原紙灰分はＪＩＳ Ｐ８１２８に準拠して測定した。また、この原紙の表面強度は、表面が２、裏面が１と測定された。
【００３５】
（新聞用紙の作成）
表面処理剤として、熱水が加熱溶解した固形分濃度２０％の酸化トウモロコシ澱粉（商品名：ＭＳ−３８００／日本食品加工社製）に水を加え、固形分濃度；５．０％の紙の表面用の表面処理剤、固形分濃度１０．０％の紙の裏面用の表面処理剤を調製した。
【００３６】
次いで、これらの表面処理剤で前記で得た原紙のそれぞれの面にゲートロールコータを使用して乾燥重量が、表面０．６ｇ／ｍ２、裏面１．１ｇ／ｍ２となるように塗布、乾燥した後、ソフトカレンダー処理を行い、オフセット印刷用新聞用紙を得た。この得られた新聞用紙の表面強度は、表面４、裏面５と測定された。
【００３７】
（実施例２）
実施例１の新聞用紙の製造において、表面処理剤の乾燥重量が表面０．３ｇ／ｍ２、裏面０．３／ｍ２となるように塗布、乾燥した以外に、実施例１と同様にしてオフセット印刷用新聞用紙を得た。この得られた新聞用紙の表面強度は、表面３、裏面１と測定された。
【００３８】
（実施例３）
実施例１の新聞用紙の製造において、表面処理剤の乾燥重量が表面２．５ｇ／ｍ２、裏面３．１ｇ／ｍ２となるように塗布、乾燥した以外に、実施例１と同様にしてオフセット印刷用新聞用紙を得た。この得られた新聞用紙の表面強度は、表面５、裏面５と測定された。
【００３９】
（比較例１）
実施例１の原紙を用い、この原紙の表面及び裏面に実施例１の固形濃度５．０％の表面処理剤をともに０．６ｇ／ｍ２となるように塗布、乾燥した以外の実施例１と同様にして新聞用紙を製造した。この得られた新聞用紙の表面強度は、表面４、裏面３と測定された。かくして得られた実施例１〜３及び比較例１のオフセット印刷用新聞用紙について、下に示す品質評価を行った結果を表１に示す。
【００４０】
（ブランケットパイリングの評価）
オフセット印刷機（ローランドＲＶＫ−３Ｂ／ローランド社製）を使用し、オフセット印刷用インキのカラー４色刷りになる印刷を連続５００００部行った後、ブランケット非画線部での紙粉の堆積の度合いを目視判定した。判定基準は下記による。
【００４１】
◎：紙粉の発生が認められない。
○：紙粉の発生が僅かに認められる。
△：紙粉の発生が認められる。
×：ブランケット上に紙粉が多く堆積している。
【００４２】
（印面白抜けの評価）
オフセット印刷機（ローランドＲＶＫ−３Ｂ）を使用し、網点面積率が３０〜１００％で オフセット輪転印刷用インキ（墨）の単色印刷を行い網点面積率１００％のベタ部の印面の白抜けの程度を目視判断した。判断基準は下記による。
【００４３】
◎：白抜けがほとんど認められない。
○：白抜けが僅かに認められる。
△：白抜けが認められる。
×：白抜けの発生が多く認められる。
【００４４】
（吸水による紙の粘着性及び、澱粉溶出によるブランケットへの澱粉付着の評価）
オフセット印刷機（ローランドＲＶＫ−３Ｂ）にて印刷中の断紙の有無および、印刷後のブランケットへの澱粉の付着状態（澱粉が付着するとブランケット表面が全体的に白っぽくなる）を目視判断した。判断基準は下記による。
【００４５】
◎：印刷中に断紙の発生の発生はなく、ブランケット表面への澱粉の付着も見られない。
○：印刷中に断紙の発生はなく、ブランケット表面が僅かに白っぽくなる。△：印刷中に断紙の発生はないが、ブランケット表面が全体的に白っぽくなる（紙粉、填量によるブランケットパイリングではない）。
×：印刷中にブランケットに紙がとられて断紙が発生する。
以上の試験結果を表１に示す。
【００４６】
【表１】
【発明の効果】
以上詳説のとおり、本発明によれば、インク着肉性にすぐれ印刷時のブランケットパイリング、印刷面の白抜けの発生が殆どなく、大部数の印刷、特にオフセット印刷に有用な新聞用紙を得ることができる。
【図面の簡単な説明】
【図１】本発明の方法を説明するための、澱粉を主成分とする表面処理剤の塗工フローを表した図である。
【符号の説明】
１…スターチ溶解タンク、２…第１の澱粉糊化装置、３…第２の澱粉糊化装置、４・５…高振動スクリーン、６・７…ファイナルタンク[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for producing newsprint for offset printing, particularly newsprint having a high content ratio of waste paper pulp (DIP). More specifically, the present invention relates to a method for effectively preventing blanket piling due to paper dust and the like in offset printing, The present invention relates to a newsprint production method and newsprint excellent in newsprint.
[0002]
[Prior art]
Conventionally, paper containing mechanical pulp or waste paper pulp has been used for newsprint. In recent years, from the viewpoint of environmental protection, a high proportion of waste paper pulp and weight reduction have been demanded.
[0003]
Recycled paper is mainly composed of old newspaper, and in addition to old newspaper, many leaflets containing hardwood pulp such as uncoated paper and coated paper are mixed.
[0004]
The ash content increases and the surface strength of the paper decreases as the used paper is used as the base paper for newsprint and the amount of the used paper increases.
[0005]
Newspaper paper with low surface strength can cause paper fibers and fillers to be peeled off from the paper surface by ink during printing, resulting in white spots or hickeys on the printed image, which causes printing troubles such as blanket piling. As a result, frequent cleaning of the blanket is inevitable, and phenomena such as mixing of paper fibers and filler into the ink of the ink fountain through the kneading roller and the retrieving roller also occur.
[0006]
As a method for solving various problems that occur due to insufficient surface strength of the paper at the time of offset printing as described above, a polymer material such as starch, PVA, polyacrylamide and the like are conventionally used on the front and back surfaces of newsprint as components. It is common practice to apply a surface treatment agent to be applied.
[0007]
[Problems to be solved by the invention]
The above problems could be largely solved by applying a surface treating agent, but this was limited to relatively small number of copies and still not solved by large number of copies such as newspaper printing. It is a fact.
[0008]
SUMMARY OF THE INVENTION An object of the present invention is to provide a method for producing newsprint paper which is free from troubles caused by paper dust, fillers and the like even when printing a large number of copies, and which has excellent ink inking property.
[0009]
[Means for Solving the Problems]
As a result of various studies, the present inventors have considered that the above problems are caused by the fact that the front surface strength for newsprint is considerably different between the front surface and the back surface. That is, the surface strength of the paper differs between the front and back surfaces of the paper depending on the type of the wire part and the press part of the paper machine and the drying conditions.
[0010]
Therefore, an object of the present invention is to provide a method for producing newsprint in which the front surface strength is made as close as possible between the front surface and the back surface, and to provide the newsprint. The object of the present invention is achieved by the following (1), (2) and (3).
[0011]
(1) In a method for producing newsprint in which a surface treatment agent containing starch as a main component is applied to the front and back surfaces of the base paper and dried, the amount of the surface treatment agent applied to the front surface and the back surface is changed individually. A method for producing newsprint, which is characterized by:
[0012]
(2) The method for producing newsprint as described in (1) above, wherein the mixing ratio of used paper in the base paper is 30 to 100% by weight.
[0013]
(3) The method for producing newsprint as described in (1) or (2) above, wherein the coating amount of the surface treatment agent containing starch as a main component is 0.4 to 3.0 g / m 2 for each of the front surface and the back surface. The surface strength can be measured by, for example, a printability tester.
[0014]
(4) In newsprint obtained by applying and drying a surface treatment agent containing starch as a main component on the front and back surfaces of the base paper, the coating amount of the surface treatment agent is individually changed between the front and back surfaces. Newsprint characterized by the fact that there is.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in more detail.
The present invention relates to the production of newsprint containing a recycled pulp made from waste paper, preferably 30 to 100% by weight of a recycled pulp made from waste paper. The surface treatment agents to be used are individually adjusted in concentration to apply a large amount of a surface treatment agent mainly composed of starch to a surface having a low surface strength. More specifically, a surface treatment agent is separately applied to the front and back surfaces of the paper so that the front and back surfaces of the paper have desired surface strengths of 4 to 5, respectively.
[0016]
The surface treating agent containing starch as a main component in the present invention includes a surface treating agent containing modified starch as a main component and a starch-containing surface treating agent. The modified starch is not particularly limited, and may be a starch obtained by subjecting a conventionally known starch material (eg, corn, potato, tapioca, wheat, rice, etc.) to an oxidation treatment or an enzyme treatment.
[0017]
As the pulp fiber which is the main component of the base paper according to the present invention, known ones such as chemical pulp (NBKP, LBKP, etc.) and fiber pulp (DIP, etc.) are appropriately used.
[0018]
A base paper containing a particularly light weight and a high ratio of waste paper pulp, specifically 30 to 100% by weight, preferably 70 to 100% by weight of waste paper pulp is used.
[0019]
FIG. 1 shows an outline of a main part (coating flow of a surface treating agent containing starch as a main component) of the method for producing newsprint of the present invention.
[0020]
Starch and fresh water are introduced from a starch dissolution tank 1 into a
[0021]
A desired amount of hot water is added to these
[0022]
Here, the concentrations of the respective surface treatment agents obtained in the first and
[0023]
The respective surface treating agents prepared in the first and
[0024]
The surface strength of each of the back side and the front side of the base paper before coating is measured by a surface strength measuring device (testing machine name: RI-2 type printing suitability testing machine / Akira Seisakusho Co., Ltd.) which is not shown. Based on this, the concentration of the surface treatment agent is determined.
[0025]
According to the study of the present inventors, the surface strength of the paper and the coating amount of the surface treatment agent are substantially proportional to each other. Therefore, by measuring the surface strength of the cardboard before coating, the surface The coating amount of the treatment agent is adjusted.
[0026]
In the prior art, as pointed out above, although the surface strength of paper has a difference between the front and back sides of the paper, there is only one tank that supplies the surface treatment agent to the size press (the front surface of the paper). Therefore, the surface treatment agent having the same concentration was applied to the front and back surfaces of the paper, and the amount of the surface treatment agent applied was the same between the front and back surfaces of the paper.
[0027]
For this reason, if paper dust troubles or pilling to the blanket occur at the time of printing at a newspaper company, it is necessary to increase the surface treatment coating amount on both sides of the paper as well as the troubled surface, which is more than necessary It was the amount of the surface treatment agent applied.
[0028]
If the coating amount of the surface treatment agent is too large, the surface treatment agent elutes during printing and adheres to the blanket of the offset printing machine, causing poor printing due to repelling and increasing the adhesiveness of the paper surface due to water absorption. In some cases, the paper is cut off and the paper is cut, and it is desirable that the surface treatment agent is not applied more than necessary.
[0029]
On the other hand, in the present invention, the surface treatment agent tank for supplying the size press is provided with two for the front side and the back side of the paper, and the coating amount of the surface treatment agent can be changed between the front side and the back side of the paper. . As a result, the coating amount of the surface treatment agent can be increased only on the surface of the paper having a low surface strength. In any event, the coating amount of the surface of the paper of the present invention, the back surface respectively 0.4~3.0g / m 2, preferably in the range from 0.4 to 2.0 g / m 2.
[0030]
(Evaluation of surface strength)
The test piece was printed using an RI tester (tester name: RI-2 type printability tester / Akira Seisakusho Co., Ltd.), and the state of white spots on the printed test piece was visually confirmed. The evaluation criteria are as follows.
[0031]
1: Correlation peeling or tearing of the paper strip 2: White spots occur in 50% or more of the paper strip area 3: White spots are noticeable on the paper strip 4: White spots are slightly recognized on the paper strip 5: White spots are seen on the paper strip Not possible [0032]
【Example】
Hereinafter, the present invention will be described in more detail with reference to Examples. Of course, the present invention is not limited to these examples. Parts and% here are parts by weight and% by weight, respectively, unless otherwise specified.
[0033]
(Example 1)
(Preparation of base paper)
Softwood kraft pulp (NBKP); 10%, thermomechanical pulp (TMP); 20%, ground pulp (GP); 5%, newspaper deinked waste paper pulp (DIP); Immediately, a pulp slurry having a freeness (CSF) of 150 ml was prepared. In the pulp slurry thus obtained, 0.2% of rosin emulsion size (product name: AL-120 / Nippon PMC Co., Ltd.), 1.5% of sulfuric acid band, and hydrated silicic acid as filler were added to paper pulp based on pulp. The paper was made using a twin-wire type paper machine to obtain a base paper having a rice area of 44 g / m 2 .
[0034]
The base paper ash content was measured according to JIS P8128. The surface strength of the base paper was measured as 2 on the front side and 1 on the back side.
[0035]
(Preparation of newsprint)
As a surface treatment agent, water was added to oxidized corn starch (trade name: MS-3800 / manufactured by Nippon Food Processing Co., Ltd.) having a solid content concentration of 20% in which hot water was dissolved by heating to obtain a paper having a solid content concentration of 5.0%. A surface treatment agent for the front surface and a surface treatment agent for the back surface of paper having a solid content of 10.0% were prepared.
[0036]
Then, the coating as dry weight using a gate roll coater on each side of the base paper obtained above in these surface treating agents, surface 0.6 g / m 2, the backside 1.1 g / m 2, After drying, a soft calender treatment was performed to obtain newsprint paper for offset printing. The surface strength of the obtained newsprint was measured as the front surface 4 and the
[0037]
(Example 2)
In the manufacture of newsprint in Example 1, dry weight surface 0.3 g /
[0038]
(Example 3)
In the manufacture of newsprint in Example 1, dry weight surface 2.5 g /
[0039]
(Comparative Example 1)
Example 1 Example 1 was repeated except that the base paper of Example 1 was used, and the surface treatment agent having a solid concentration of 5.0% of Example 1 was applied to both the front and back surfaces of the base paper so as to have a solid concentration of 0.6 g / m 2 and dried. A newsprint was produced in the same manner as described above. The surface strength of the obtained newsprint was measured as the front surface 4 and the back surface 3. Table 1 shows the quality evaluation results shown below for the offset printing newsprint obtained in Examples 1 to 3 and Comparative Example 1 thus obtained.
[0040]
(Evaluation of blanket piling)
Using an offset printing machine (Roland RVK-3B / Roland Co.), after continuously performing 50,000 copies of a four-color printing of the offset printing ink, the degree of accumulation of paper powder in the blanket non-image area was determined. It was visually determined. The criteria are as follows.
[0041]
：: No generation of paper dust was observed.
：: Generation of paper powder is slightly observed.
Δ: Generation of paper powder is observed.
×: A lot of paper powder is deposited on the blanket.
[0042]
(Evaluation of white area on stamped surface)
Using an offset printing machine (Roland RVK-3B), a single-color printing of offset rotary printing ink (black ink) with a halftone dot area ratio of 30 to 100% is performed, and a blank area of a solid portion having a halftone dot area ratio of 100% is printed. Was visually determined. The criteria are as follows.
[0043]
A: Almost no white spots were observed.
：: White spots are slightly observed.
Δ: White spots are observed.
×: Many white spots are observed.
[0044]
(Evaluation of paper stickiness due to water absorption and starch adhesion to blanket due to starch elution)
With an offset printing machine (Roland RVK-3B), the presence or absence of a sheet break during printing and the adhesion state of starch to the blanket after printing (the blanket surface becomes whitish as a whole when starch adheres) were visually judged. The criteria are as follows.
[0045]
：: No paper break occurred during printing, and no starch adhered to the blanket surface.
：: No paper break occurred during printing, and the blanket surface became slightly whitish. Δ: There is no paper break during printing, but the blanket surface is entirely whitish (not blanket piling due to paper powder and filling amount).
×: Paper is cut off on the blanket during printing, and paper breakage occurs.
Table 1 shows the test results.
[0046]
[Table 1]
【The invention's effect】
As described in detail above, according to the present invention, it is possible to obtain newsprint paper which is excellent in ink inking property, hardly generates blanket piling during printing, hardly generates white spots on the printed surface, and is useful for printing a large number of copies, particularly offset printing. Can be.
[Brief description of the drawings]
FIG. 1 is a diagram showing a coating flow of a surface treatment agent containing starch as a main component for explaining a method of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Starch dissolving tank, 2 ... 1st starch gelatinization device, 3 ... 2nd starch gelatinization device, 4.5: High-vibration screen, 6/7 Final tank
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003003831A JP3794575B2 (en) | 2003-01-10 | 2003-01-10 | Newspaper paper manufacturing method and newsprint paper |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003003831A JP3794575B2 (en) | 2003-01-10 | 2003-01-10 | Newspaper paper manufacturing method and newsprint paper |
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| Publication Number | Publication Date |
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| JP2004218100A true JP2004218100A (en) | 2004-08-05 |
| JP3794575B2 JP3794575B2 (en) | 2006-07-05 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006104622A (en) * | 2004-10-07 | 2006-04-20 | Miyoshi Oil & Fat Co Ltd | Recycled paper |
| JP2009013513A (en) * | 2007-07-02 | 2009-01-22 | Daio Paper Corp | Newsprint paper |
| JP2014173206A (en) * | 2013-03-11 | 2014-09-22 | Nippon Paper Industries Co Ltd | Continuous recording paper |
-
2003
- 2003-01-10 JP JP2003003831A patent/JP3794575B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006104622A (en) * | 2004-10-07 | 2006-04-20 | Miyoshi Oil & Fat Co Ltd | Recycled paper |
| JP2009013513A (en) * | 2007-07-02 | 2009-01-22 | Daio Paper Corp | Newsprint paper |
| JP2014173206A (en) * | 2013-03-11 | 2014-09-22 | Nippon Paper Industries Co Ltd | Continuous recording paper |
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| JP3794575B2 (en) | 2006-07-05 |
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