JP4496435B2 - Newspaper for offset printing - Google Patents

Newspaper for offset printing Download PDF

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JP4496435B2
JP4496435B2 JP2006304572A JP2006304572A JP4496435B2 JP 4496435 B2 JP4496435 B2 JP 4496435B2 JP 2006304572 A JP2006304572 A JP 2006304572A JP 2006304572 A JP2006304572 A JP 2006304572A JP 4496435 B2 JP4496435 B2 JP 4496435B2
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whiteness
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newspaper
opacity
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恵吾 島田
辰二 藤田
彰 山内
辰朗 山内
孝則 徳岡
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Marusumi Paper Co Ltd
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Description

本発明は、白色度と不透明度の高いオフセット印刷用新聞用紙に関するものである。  The present invention relates to newsprint for offset printing having high whiteness and opacity.

近年のオフセット印刷用新聞用紙は、カラー印刷が多用されており、カラー印刷の見栄えは原紙の白色度が高いほど良くなることから、一般のオフセット印刷用新聞用紙の白色度のアップが要求されている。また、オフセット印刷用新聞用紙には軽量化(低坪量化)が求められている。低坪量の紙は表面の印刷が裏面から見える裏抜けが生じやすく、比較的多量のインクが付与されるカラー印刷では裏抜けが生じやすい。したがって、低坪量であっても高い不透明度が要求される。  In recent years, newspapers for offset printing are often used for color printing, and the higher the whiteness of the base paper, the better the appearance of color printing. Yes. In addition, the newspaper for offset printing is required to be lightweight (low basis weight). Paper with a low basis weight tends to show through on the front surface when viewed from the back side, and through printing tends to occur on color printing to which a relatively large amount of ink is applied. Therefore, high opacity is required even with a low basis weight.

新聞用紙の白色度を向上させる方法としては、原料のパルプの漂白を進め、白色度を向上させる方法と、填料を添加する方法がある。パルプの漂白を進めて白色度を上げると不透明度が低下することになるので、填料を内添する方法が採用されている。填料を内添すると白色度を上げるとともに不透明度を上げることができる。  As a method for improving the whiteness of newsprint, there are a method of improving the whiteness by proceeding with bleaching of the raw material pulp and a method of adding a filler. Since the opacity decreases when the whiteness of the pulp is increased by increasing the bleaching, a method of internally adding a filler is adopted. Adding a filler can increase whiteness and opacity.

新聞用紙に通常使用される填料としては、ホワイトカーボン、タルク、クレー、二酸化チタン、炭酸カルシウム、尿素ホルマリン樹脂、などそれぞれの特性により使用されている。
例えば、二酸化チタンは光散乱係数が非常に高いので、不透明度を向上させるには有効であるが、高価であり、新聞用紙では多用されていない。タルク、カオリンは安価であるが、吸油性はそれほど高くない。炭酸カルシウムは酸性抄紙では分解するので、中性抄紙に使用が限定される。
そこで、特に吸油性の高いホワイトカーボンや尿素ホルマリンポリマーが比較的少量の添加量で印刷不透明度向上の効果が高く、なかでも、ホワイトカーボンが多く使用されている。
As fillers usually used for newsprint, white carbon, talc, clay, titanium dioxide, calcium carbonate, urea formalin resin, and the like are used.
For example, since titanium dioxide has a very high light scattering coefficient, it is effective for improving the opacity, but it is expensive and is not widely used in newsprint. Talc and kaolin are inexpensive, but their oil absorption is not so high. Since calcium carbonate decomposes in acidic papermaking, its use is limited to neutral papermaking.
In view of this, white carbon and urea formalin polymer having high oil absorbency are particularly effective in improving printing opacity with a relatively small addition amount, and white carbon is often used.

しかし、これらの内添薬品は、添加量が多くなると、抄紙機のワイヤーでの歩留まりが悪くなるほか、印刷時にブランケットにとられるパイリングを起こしやすくなるという問題がある。そこで、各種顔料を接着剤とともに原紙表面に塗布する方法が提案されている。
具体的には、次のような技術が提案されている。
(1)高吸油性顔料と低吸油性顔料を使用し、顔料全体の吸油量が65cc/100g〜150cc/100gであって、平滑度が30〜150秒であるコールドセット型新聞輪転印刷機用新聞用紙。(特許文献1)
(2)針状顔料を含みかつ平均吸油量が65cc/100g以上の顔料を含有する塗工層を設けたことを特徴とする、コールドセット型新聞輪転印刷機用の新聞印刷用紙。(特許文献2)
(3)原紙の動的濡れ値が−0.32〜0.20gであり、塗被組成物の顔料として、(a)カオリンを10〜90重量%、(b)不定形で平均粒子径が0.5μm以上の顔料を10〜90重量%含有し、更に、高圧ガーレー透気度試験機による塗被新聞用紙の透気度が300秒/10cc以下であることを特徴とする塗被新聞用紙の製造方法。(特許文献3)
(4)顔料と接着剤と表面サイズ剤とを含有する表面処理剤を塗工してなる印刷用新聞用紙であって、前記顔料の50質量%以上が軽質炭酸カルシウムであり、前記接着剤の主成分が澱粉であり、前記炭酸カルシウムの乾燥塗工量が片面当り0.3〜3.0g/mであるオフセット印刷用新聞用紙。(特許文献4)
特公平4−9237 特許第2504819号 特許第2823941号 特開2006−169706号
However, when the amount of these internally added chemicals increases, there is a problem that the yield of the paper machine wire is deteriorated, and further, it is easy to cause piling that is taken on the blanket during printing. Therefore, a method of applying various pigments to the base paper surface together with an adhesive has been proposed.
Specifically, the following techniques have been proposed.
(1) For cold-set newspaper rotary printing presses using high oil-absorbing pigments and low oil-absorbing pigments, having an oil absorption of 65 cc / 100 g to 150 cc / 100 g, and a smoothness of 30 to 150 seconds. Newspaper. (Patent Document 1)
(2) A newspaper printing paper for a cold-set newspaper rotary printing press, comprising a coating layer containing a needle-like pigment and containing a pigment having an average oil absorption of 65 cc / 100 g or more. (Patent Document 2)
(3) The dynamic wetting value of the base paper is -0.32 to 0.20 g, (a) 10 to 90% by weight of kaolin as a pigment of the coating composition, (b) an irregular shape and an average particle size Coated newspaper paper containing 10 to 90% by weight of a pigment of 0.5 μm or more, and further having an air permeability of 300 seconds / 10 cc or less by a high-pressure Gurley permeability tester. Manufacturing method. (Patent Document 3)
(4) Newsprint paper for printing formed by applying a surface treatment agent containing a pigment, an adhesive, and a surface sizing agent, wherein 50% by mass or more of the pigment is light calcium carbonate; Newsprint paper for offset printing in which the main component is starch and the dry coating amount of the calcium carbonate is 0.3 to 3.0 g / m 2 per side. (Patent Document 4)
JP 4-9237 Patent No. 2504819 Japanese Patent No. 2823941 JP 2006-169706 A

特許文献1と特許文献2に記載の発明は、塗布方法について検討されておらず、実施例ではブレードコーター、エアーナイフコーターのみの記載であり、塗布する顔料と接着剤の割合について記載されていない。
特許文献3に記載の発明は、実施例にはブレードコーターの記載しか無く、塗料の濃度が高いので、ゲートロールコーターでの少量塗布には適用できない。
特許文献4に記載の発明は、顔料として炭酸カルシウムを使用しているが、炭酸カルシウムは白色度は高いが、屈折率が低いので、澱粉と混合して塗布した場合の白色度、不透明度の上昇が少ない。
The inventions described in Patent Document 1 and Patent Document 2 are not examined for the coating method, and in the examples, only the blade coater and the air knife coater are described, and the ratio of the pigment to be applied and the adhesive is not described. .
The invention described in Patent Document 3 only describes a blade coater in the examples, and since the concentration of the paint is high, it cannot be applied to a small amount of application with a gate roll coater.
The invention described in Patent Document 4 uses calcium carbonate as a pigment, but calcium carbonate has a high whiteness but a low refractive index. Therefore, the whiteness and opacity when coated with starch are mixed. There is little rise.

上記課題を解決するために、本発明は以下の構成とする。
(1)原紙上に、顔料と接着剤を含む表面処理剤を塗布、乾燥してなるオフセット印刷用新聞用紙において、
塗布装置としてゲートロールコーターを用い、
顔料の主成分が焼成カオリンであり、
接着剤の主成分が酸化澱粉であり、
表面処理剤の塗布量が片面当り0.5〜3g/m であり、
顔料と接着剤の塗布量の比率が4:6〜7:3の範囲であり、
表面処理剤の塗布濃度が10〜20%である
ことを特徴とするオフセット印刷用新聞用紙。
(2)原紙に吸油量が150cc/100g以上の填料が0.5%以上内添されていることを特徴とする(1)記載のオフセット印刷用新聞用紙。
In order to solve the above problems, the present invention has the following configuration.
(1) In newsprint paper for offset printing, which is obtained by applying a surface treatment agent containing a pigment and an adhesive on a base paper and drying it.
Using a gate roll coater as a coating device,
The main component of the pigment is calcined kaolin,
The main component of the adhesive is oxidized starch,
The coating amount of the surface treatment agent is 0.5 to 3 g / m 2 per side ,
The ratio of the coating amount of the pigment and the adhesive is in the range of 4: 6 to 7: 3,
Newsprint paper for offset printing , wherein the coating concentration of the surface treatment agent is 10 to 20% .
(2) Newsprint paper for offset printing according to (1), wherein a filler having an oil absorption of 150 cc / 100 g or more is internally added to the base paper by 0.5% or more.

本発明によれば、白色度、不透明度が高く、パイリング、セットオフの発生のないオフセット印刷用新聞用紙を得ることができる。  According to the present invention, it is possible to obtain an offset printing newsprint having high whiteness and opacity and no occurrence of piling and set-off.

以下、本発明の実施の形態を説明する。
本発明にかかるオフセット印刷用新聞用紙は、原料パルプの主成分として、古紙脱墨パルプ(DIP)を使用する。
古紙脱墨パルプ(DIP)は、通常、新聞古紙や雑誌古紙を離解工程で離解した後、除塵工程で除塵し、脱墨工程で脱墨剤を添加し、フローテーターによってインクを浮遊分離して除去する。そして、精選工程で精選した後、漂白工程で漂白を行なう。
また、古紙脱墨パルプ(DIP)と併せて使用するパルプとしては、例えば、ストーングラウンドパルプ(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)、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)等の機械パルプや針葉樹クラフトパルプ(NKP)、広葉樹クラフトパルプ(LKP)等の化学パルプから適宜選択して使用することができる。不透明度の点では機械パルプを使用するのが好ましく、強度の点で化学パルプを使用するのが好ましい。
Embodiments of the present invention will be described below.
The newsprint for offset printing according to the present invention uses waste paper deinked pulp (DIP) as the main component of the raw material pulp.
Waste paper deinking pulp (DIP) is usually separated from newspaper and magazine waste paper in the disaggregation process, then dust is removed in the dust removal process, deinking agent is added in the deinking process, and the ink is floated and separated by a floatator. Remove. And after selecting in a selective process, bleaching is performed in a bleaching process.
Moreover, as a pulp used in conjunction with waste paper deinking pulp (DIP), for example, stone ground pulp (SGP), pressurized stone ground pulp (PGP), refiner ground pulp (RGP), thermomechanical pulp (TMP), It can be used by appropriately selecting from mechanical pulp such as chemisermomechanical pulp (CTMP) and chemical pulp such as softwood kraft pulp (NKP) and hardwood kraft pulp (LKP). Mechanical pulp is preferably used in terms of opacity, and chemical pulp is preferably used in terms of strength.

本発明では、原紙に吸油量が150cc/100g以上の填料を0.5%以上内添する。塗布層の顔料と接着剤に吸収されなかったインクは、原紙に到達し、原紙に含有された填料に吸収される。よって、吸油量の大きい填料を原紙に内添することにより、インキセットが良好となる。このような吸油量の大きい填料としてはホワイトカーボン、焼成カオリンが好ましい。その他、クレー、デラミカオリン、軽質炭酸カルシウム、二酸化チタン、水酸化アルミニウムなどの無機填料や、尿素ホルマリン樹脂、ポリスチレン樹脂などの有機顔料などが使用できる。  In the present invention, 0.5% or more of a filler having an oil absorption of 150 cc / 100 g or more is internally added to the base paper. The ink that has not been absorbed by the pigment and adhesive of the coating layer reaches the base paper and is absorbed by the filler contained in the base paper. Therefore, an ink set is improved by adding a filler having a large oil absorption amount to the base paper. As such a filler having a large oil absorption amount, white carbon and calcined kaolin are preferable. In addition, inorganic fillers such as clay, delaminated kaolin, light calcium carbonate, titanium dioxide, and aluminum hydroxide, and organic pigments such as urea formalin resin and polystyrene resin can be used.

本発明では、オフセット印刷用新聞用紙の灰分を抄紙機に設置されたBM計(Basis Weight and Moisture Measurement Sensors)を用いてオンライン測定し、測定結果をもとに填料添加量の増減を行うことが好ましく、この際、灰分のオンライン測定を行う箇所は、塗布前、塗布後、リール前など適宜選択することができる。とくに、灰分を塗布前と塗布後で測定し、表面処理剤の塗布量を連続測定して表面処理剤の濃度を調整することにより、填料を過剰に添加することなく、低い灰分で白色度を向上させることができる。  In the present invention, the ash content of newsprint for offset printing is measured online using a BM meter (Basis Weight and Moisture Measurement Sensors) installed in the paper machine, and the filler addition amount is increased or decreased based on the measurement result. Preferably, at this time, the place where the on-line measurement of ash content can be appropriately selected before application, after application, before reel, and the like. In particular, the ash content is measured before and after coating, and the coating amount of the surface treatment agent is continuously measured to adjust the concentration of the surface treatment agent, so that the whiteness can be reduced with low ash content without adding excessive filler. Can be improved.

本発明で使用するサイズ剤としては、ロジン系サイズ剤、アルキルケテンダイマー、アルケニル無水琥珀酸などのサイズ剤が使用できる。また、凝集剤としては、硫酸バンド、カチオン澱粉、ポリアクリルアミド系凝集剤などが使用できる。抄紙pHは酸性、中性を問わない。その他、必要に応じ、乾燥紙力増強剤、湿潤紙力増強剤、染料、スライムコントロール剤、ピッチコントロール剤、消泡剤等の添加剤を内添することができる。  As the sizing agent used in the present invention, sizing agents such as rosin sizing agents, alkyl ketene dimers, and alkenyl succinic anhydrides can be used. In addition, as the flocculant, sulfate band, cationic starch, polyacrylamide flocculant and the like can be used. The papermaking pH may be acidic or neutral. In addition, additives such as a dry paper strength enhancer, a wet paper strength enhancer, a dye, a slime control agent, a pitch control agent, and an antifoaming agent can be internally added as necessary.

本発明では、顔料と接着剤からなる表面処理剤を塗布する。
本発明では顔料として、焼成カオリンを使用する。焼成カオリン以外の顔料で、白色度、不透明の高い顔料としては、二酸化チタン、ホワイトカーボン、炭酸カルシウムなどが知られているが、前述したように二酸化チタンは高価であり、ホワイトカーボンは、平均粒子径が大きく、パイリングの問題を起こしやすく、パイリングの問題を起こさない程度に接着剤の比率を高めると白色度の上昇が少なくなくなる。また、炭酸カルシウムは、内添の填料、あるいは、塗工紙用の顔料として広く使用されているが、本発明のような塗布量が少ない場合は、焼成カオリンと比較して、白色度、不透明度の上昇が少ない。
In the present invention, a surface treatment agent comprising a pigment and an adhesive is applied.
In the present invention, calcined kaolin is used as the pigment. As pigments other than calcined kaolin and high whiteness and opaqueness, titanium dioxide, white carbon, calcium carbonate, etc. are known, but as described above, titanium dioxide is expensive, and white carbon has an average particle size. When the ratio of the adhesive is increased to such an extent that the diameter is large and the problem of piling is likely to occur and the problem of piling is not caused, the increase in whiteness is not small. In addition, calcium carbonate is widely used as an internal filler or a pigment for coated paper. However, when the coating amount is small as in the present invention, the whiteness and poorness are lower than those of calcined kaolin. Little increase in transparency.

焼成カオリンは、カオリンを熱処理して、分子中の水を除くことによって得られ、熱処理により白色度、屈折率が上昇している。焼成カオリンの白色度は90%以上、平均粒子径は1.8μm以下が好ましい。  The calcined kaolin is obtained by heat-treating kaolin to remove water in the molecule, and the whiteness and refractive index are increased by the heat treatment. The whiteness of the calcined kaolin is preferably 90% or more and the average particle size is 1.8 μm or less.

焼成カオリン以外の顔料としては、一般塗工紙に使用されているカオリン、炭酸カルシウム、二酸化チタン、ホワイトカーボンなどが使用できるが、焼成カオリンは表面処理剤中の全顔料のうち80重量%以上とするのが好ましい。  As pigments other than calcined kaolin, kaolin, calcium carbonate, titanium dioxide, white carbon and the like used in general coated paper can be used, but calcined kaolin is 80% by weight or more of the total pigment in the surface treatment agent. It is preferable to do this.

本発明では、接着剤として、酸化澱粉を使用する。
接着剤を塗布することにより、白色度が低下するが、酸化澱粉は他の接着剤より白色度の低下が少ない。そのほかの接着剤としては、ポリアクリルアミド、ポリビニルアルコール、スチレンマレイン酸系共重合体、スチレンアクリル酸系共重合体などが使用できるが、酸化澱粉は全接着剤のうち60重量%以上含有するのが好ましい。
In the present invention, oxidized starch is used as the adhesive.
Although whiteness falls by apply | coating an adhesive agent, oxidized starch has less fall of whiteness than another adhesive agent. As other adhesives, polyacrylamide, polyvinyl alcohol, styrene maleic acid copolymer, styrene acrylic acid copolymer and the like can be used, but the oxidized starch should contain 60% by weight or more of the total adhesive. preferable.

本発明では表面処理剤を塗布するための塗布装置として、ゲートロールコーターを使用することが好ましい。ゲートロールコーターは、低濃度、低粘度の塗布液を均一に塗布するのに適しており、連続操業性も良好である。  In this invention, it is preferable to use a gate roll coater as a coating device for apply | coating a surface treating agent. The gate roll coater is suitable for uniformly applying a low-concentration, low-viscosity coating solution, and has good continuous operability.

本発明では表面処理剤の塗布量が片面当り0.5〜3g/mとなるようにする。表面処理剤の塗布量が0.5g/mより少ないと白色度の上昇が不十分であり、パイリングを起こしやすくなる。表面処理剤の塗布量が3g/mより多いとパイリングの問題を起こすおそれがあり、これを防止するために接着剤の比率を増やすとセットオフが悪くなるという問題が生じる。In the present invention, the coating amount of the surface treatment agent is set to 0.5 to 3 g / m 2 per side. When the coating amount of the surface treatment agent is less than 0.5 g / m 2 , the whiteness is not sufficiently increased, and it tends to cause piling. When the coating amount of the surface treatment agent is more than 3 g / m 2 , there is a possibility of causing a problem of piling. If the ratio of the adhesive is increased in order to prevent this, there arises a problem that the set-off becomes worse.

また、表面処理剤に含まれる顔料と接着剤の塗布量の固形分比率は4:6〜7:3とする。この範囲を超えて顔料の比率が接着剤の比率に対して低いと、顔料が接着剤に埋没してしまい、白色度の向上が不十分となる。逆に顔料の比率が接着剤の比率に対して高いと、顔料が剥がれやすく、パイリングの問題を起こす。  Moreover, the solid content ratio of the coating amount of the pigment and adhesive contained in the surface treatment agent is set to 4: 6 to 7: 3. If the ratio of the pigment is lower than the ratio of the adhesive beyond this range, the pigment is buried in the adhesive and the whiteness is not sufficiently improved. On the contrary, when the ratio of the pigment is high with respect to the ratio of the adhesive, the pigment is easily peeled off, which causes a problem of piling.

ゲートロールコーターを用いて表面処理剤を塗布する際、表面処理剤の濃度は10〜20%とするのが好ましく、12〜17%とするのがさらに好ましい。表面処理剤の濃度が10%より低いと塗布量が不足し、20%より高いと表面処理剤の粘度が高くなり、均一な塗布が難しくなる。  When a surface treatment agent is applied using a gate roll coater, the concentration of the surface treatment agent is preferably 10 to 20%, and more preferably 12 to 17%. When the concentration of the surface treatment agent is lower than 10%, the coating amount is insufficient, and when it is higher than 20%, the viscosity of the surface treatment agent becomes high and uniform application becomes difficult.

表面処理剤には、そのほか、増粘剤、分散剤、pH調整剤、防腐剤、蛍光染料など一般的に塗布に使用されている薬品を使用することができる。ゲートロールコーターでの塗布量は、塗布液の濃度、粘度などによって調整される。  In addition to the above, chemicals generally used for coating such as thickeners, dispersants, pH adjusters, preservatives, and fluorescent dyes can be used as the surface treatment agent. The coating amount at the gate roll coater is adjusted by the concentration, viscosity, etc. of the coating solution.

本発明のオフセット印刷用新聞用紙の製造に際しては、表面処理剤の塗布、乾燥後に、カレンダー装置により平滑化処理する。かかるカレンダー装置としては、チルドカレンダー、スーパーカレンダー、ソフトカレンダー、グロスカレンダーなどの一般に使用されているカレンダー装置が使用できる。
以上のようにして、本発明のオフセット印刷用新聞用紙が得られる。
In the production of newsprint for offset printing of the present invention, the surface treatment agent is applied and dried, and then smoothed by a calendar device. As such a calendar device, commonly used calendar devices such as a chilled calendar, a super calendar, a soft calendar, and a gloss calendar can be used.
As described above, the newsprint for offset printing of the present invention is obtained.

以下、実施例及び比較例により、本発明を具体的に説明する。
(実施例1)
新聞古紙脱墨パルプ80重量部とTMP20重量部をパルプ原料として使用し、酸性ロジンサイズ剤を0.5%添加し、硫酸バンドでpHを5.5に調整し、填料としてホワイトカーボン(市販品 吸油量220cc/100g)を1.5重量%含むように添加してギャップフォーマー型抄紙機で抄紙し、ゲートロールコーターで表面処理剤を下記の条件で両面に塗布して、坪量43.0g/mの新聞用紙を製造した。得られた新聞用紙の白色度、不透明度、パイリング評価、セットオフ評価の結果を表1に示す。
塗布液 焼成カオリン:酸化澱粉=4:6(固形分重量比)、固形分濃度 15%
塗布量 1.2g/m(片面)
Hereinafter, the present invention will be specifically described with reference to Examples and Comparative Examples.
Example 1
Use 80 parts by weight of newspaper waste ink deinked pulp and 20 parts by weight of TMP as pulp raw materials, add 0.5% of acidic rosin sizing agent, adjust pH to 5.5 with sulfuric acid band, and use white carbon as a filler (commercially available product) Oil absorption 220 cc / 100 g) is added so as to contain 1.5% by weight, paper is made with a gap former type paper machine, and a surface treatment agent is applied to both sides with a gate roll coater under the following conditions. 0 g / m 2 newsprint was produced. Table 1 shows the results of the whiteness, opacity, piling evaluation, and set-off evaluation of the obtained newspaper.
Coating liquid Calcined kaolin: oxidized starch = 4: 6 (solid content weight ratio), solid content concentration 15%
Application amount 1.2g / m 2 (single side)

(実施例2)
塗布液の焼成カオリンと酸化澱粉の固形分重量比率を5:5とした以外は実施例1と同様に新聞用紙を製造した。得られた新聞用紙の白色度、不透明度、パイリング評価、セットオフ評価の結果を表1に示す。
(実施例3)
塗布液の焼成カオリンと酸化澱粉の固形分重量比率を6:4とした以外は実施例1と同様に新聞用紙を製造した。得られた新聞用紙の白色度、不透明度、パイリング評価、セットオフ評価の結果を表1に示す。
(実施例4)
塗布液の焼成カオリンと酸化澱粉の固形分重量比率を7:3とした以外は実施例1と同様に新聞用紙を製造した。得られた新聞用紙の白色度、不透明度、パイリング評価、セットオフ評価の結果を表1に示す。
(実施例5)
塗布液の焼成カオリンと酸化澱粉の固形分重量比率を6:4とし、塗布量を0.5g/mとした以外は実施例1と同様に新聞用紙を製造した。得られた新聞用紙の白色度、不透明度、パイリング評価、セットオフ評価の結果を表1に示す。
(実施例6)
塗布量を3.0g/mとした以外は実施例5と同様に新聞用紙を製造した。得られた新聞用紙の白色度、不透明度、パイリング評価、セットオフ評価の結果を表1に示す。
(Example 2)
Newsprint paper was produced in the same manner as in Example 1 except that the solid content weight ratio of the calcined kaolin and oxidized starch in the coating solution was 5: 5. Table 1 shows the results of the whiteness, opacity, piling evaluation, and set-off evaluation of the obtained newspaper.
(Example 3)
Newspaper paper was produced in the same manner as in Example 1 except that the weight ratio of the solid content of calcined kaolin and oxidized starch in the coating solution was 6: 4. Table 1 shows the results of the whiteness, opacity, piling evaluation, and set-off evaluation of the obtained newspaper.
Example 4
Newspaper paper was produced in the same manner as in Example 1 except that the solid content weight ratio of the calcined kaolin and oxidized starch in the coating solution was 7: 3. Table 1 shows the results of the whiteness, opacity, piling evaluation, and set-off evaluation of the obtained newspaper.
(Example 5)
Newsprint paper was produced in the same manner as in Example 1 except that the solid content weight ratio of calcined kaolin and oxidized starch in the coating solution was 6: 4 and the coating amount was 0.5 g / m 2 . Table 1 shows the results of the whiteness, opacity, piling evaluation, and set-off evaluation of the obtained newspaper.
(Example 6)
Newspaper was produced in the same manner as in Example 5 except that the coating amount was 3.0 g / m 2 . Table 1 shows the results of the whiteness, opacity, piling evaluation, and set-off evaluation of the obtained newspaper.

(比較例1)
塗布液の焼成カオリンと酸化澱粉の固形分重量比率を3:7とした以外は実施例1と同様に新聞用紙を製造した。得られた新聞用紙の白色度、不透明度、パイリング評価、セットオフ評価の結果を表1に示す。
(比較例2)
塗布液の焼成カオリンと酸化澱粉の固形分重量比率を8:2とした以外は実施例1と同様に新聞用紙を製造した。得られた新聞用紙の白色度、不透明度、パイリング評価、セットオフ評価の結果を表1に示す。
(比較例3)
塗布液の焼成カオリンと酸化澱粉の固形分重量比率を6:4とし、塗布量を0.4g/mとした以外は実施例1と同様に新聞用紙を製造した。得られた新聞用紙の白色度、不透明度、パイリング評価、セットオフ評価の結果を表1に示す。
(比較例4)
塗布液の焼成カオリンと酸化澱粉の固形分重量比率を6:4とし、塗布量を4.0g/mとした以外は実施例1と同様に新聞用紙を製造した。得られた新聞用紙の白色度、不透明度、パイリング評価、セットオフ評価の結果を表1に示す。
(Comparative Example 1)
Newsprint paper was produced in the same manner as in Example 1 except that the solid content weight ratio of the calcined kaolin and oxidized starch in the coating solution was 3: 7. Table 1 shows the results of the whiteness, opacity, piling evaluation, and set-off evaluation of the obtained newspaper.
(Comparative Example 2)
Newsprint paper was produced in the same manner as in Example 1 except that the solid content weight ratio of the calcined kaolin and oxidized starch in the coating solution was 8: 2. Table 1 shows the results of the whiteness, opacity, piling evaluation, and set-off evaluation of the obtained newspaper.
(Comparative Example 3)
Newsprint paper was produced in the same manner as in Example 1 except that the solid content weight ratio of calcined kaolin and oxidized starch in the coating solution was 6: 4 and the coating amount was 0.4 g / m 2 . Table 1 shows the results of the whiteness, opacity, piling evaluation, and set-off evaluation of the obtained newspaper.
(Comparative Example 4)
Newsprint paper was produced in the same manner as in Example 1 except that the solid content weight ratio of the calcined kaolin and oxidized starch in the coating solution was 6: 4 and the coating amount was 4.0 g / m 2 . Table 1 shows the results of the whiteness, opacity, piling evaluation, and set-off evaluation of the obtained newspaper.

(比較例5)
顔料としてホワイトカーボンを使用し、塗布液のホワイトカーボンと酸化澱粉の固形分重量比率を4:6とした以外は実施例1と同様に新聞用紙を製造した。得られた新聞用紙の白色度、不透明度、パイリング評価、セットオフ評価の結果を表2に示す。
(比較例6)
塗布液のホワイトカーボンと酸化澱粉の固形分重量比率を5:5とした以外は比較例5と同様に新聞用紙を製造した。得られた新聞用紙の白色度、不透明度、パイリング評価、セットオフ評価の結果を表2に示す。
(比較例7)
塗布液のホワイトカーボンと酸化澱粉の固形分重量比率を3:7とした以外は比較例5と同様に新聞用紙を製造した。得られた新聞用紙の白色度、不透明度、パイリング評価、セットオフ評価の結果を表2に示す。
(Comparative Example 5)
Newspaper paper was produced in the same manner as in Example 1 except that white carbon was used as the pigment and the weight ratio of white carbon to oxidized starch in the coating solution was set to 4: 6. Table 2 shows the results of the whiteness, opacity, piling evaluation, and set-off evaluation of the obtained newspaper.
(Comparative Example 6)
Newspaper paper was produced in the same manner as in Comparative Example 5 except that the weight ratio of white carbon to oxidized starch in the coating solution was 5: 5. Table 2 shows the results of the whiteness, opacity, piling evaluation, and set-off evaluation of the obtained newspaper.
(Comparative Example 7)
Newspaper paper was produced in the same manner as in Comparative Example 5 except that the solid weight ratio of white carbon and oxidized starch in the coating solution was 3: 7. Table 2 shows the results of the whiteness, opacity, piling evaluation, and set-off evaluation of the obtained newspaper.

顔料として炭酸カルシウムを使用し、塗布液のホワイトカーボンと酸化澱粉の固形分重量比率を7:3とした以外は実施例1と同様に新聞用紙を製造した。得られた新聞用紙の白色度、不透明度、パイリング評価、セットオフ評価の結果を表3に示す。  Newspaper was produced in the same manner as in Example 1 except that calcium carbonate was used as the pigment and the weight ratio of white carbon to oxidized starch in the coating solution was 7: 3. Table 3 shows the results of the whiteness, opacity, piling evaluation, and set-off evaluation of the resulting newspaper.

Figure 0004496435
Figure 0004496435
Figure 0004496435
Figure 0004496435
Figure 0004496435
Figure 0004496435

(白色度の評価)
JISP8148「紙、板紙及びパルプ−ISO白色度(拡散青色光反射率)の測定方法」に準じて測定し、比較例1の白色度(53.5%)を基準とし、上昇した白色度の値で評価した。
(不透明度の評価)
JISP8149「紙及び板紙−不透明度試験方法(紙の裏当て)−拡散証明照明法」に準じて測定し、比較例1の不透明度(92.0%)を基準とし、上昇した不透明度の値で評価した。
(パイリング評価)
タック値13のインキを使用して、RI印刷試験機で印刷を行い、ブランケットに残ったインキをコート紙に転写して、白抜け部分を観察し、◎優れる、○良い、×悪い、の3段階で評価した。
(セットオフ評価)
新聞用オフセットインキを使用して、RI印刷試験機にてベタ印刷を行い、10分後に上質紙にインキを転写させ、各新聞用紙のインキセットを、優れる◎、良い○、悪い×、の3段階で評価した。
(Evaluation of whiteness)
Measured according to JISP8148 “Paper, paperboard and pulp—Measurement method of ISO whiteness (diffuse blue light reflectance)” and increased whiteness value based on the whiteness (53.5%) of Comparative Example 1 It was evaluated with.
(Evaluation of opacity)
Measured according to JISP 8149 “Paper and paperboard—Opacity test method (backing of paper) —Diffusion proof illumination method”, increased opacity value based on opacity (92.0%) of Comparative Example 1 It was evaluated with.
(Piling evaluation)
Using an ink having a tack value of 13, printing is performed with an RI printing test machine, the ink remaining on the blanket is transferred to the coated paper, the white spots are observed, and ◎ excellent, ◯ good, × bad. Rated by stage.
(Set-off evaluation)
Using a newspaper offset ink, solid printing was performed with an RI printing tester, and after 10 minutes, the ink was transferred to a high-quality paper, and the ink set of each newspaper paper was excellent ◎, good ○, bad × 3 Rated by stage.

本発明の実施例1〜6では、白色度、不透明度が上昇しており、パイリング、セットオフの評価も良好となっている。
比較例2は、焼成カオリンの比率が澱粉に対して高いので、パイリングの評価が悪くなっている。比較例3は、塗布量が0.4g/mと低いので、白色度、不透明度の上昇が小さく、パイリングの評価も悪くなっている。比較例4は、塗布量が4.0g/mと多いので、白色度、不透明度の上昇は大きいが、セットオフの評価が悪くなっている。
In Examples 1 to 6 of the present invention, the whiteness and opacity are increased, and the evaluations of piling and set-off are also good.
In Comparative Example 2, since the ratio of calcined kaolin is high with respect to starch, the evaluation of piling is poor. In Comparative Example 3, since the coating amount is as low as 0.4 g / m 2 , the increase in whiteness and opacity is small, and the evaluation of piling is also poor. In Comparative Example 4, since the coating amount is as large as 4.0 g / m 2 , the increase in whiteness and opacity is large, but the evaluation of set-off is poor.

比較例5はホワイトカーボンを使用したこと以外は実施例1と同じ条件であるが、パイリングの評価が悪くなっている。比較例6もホワイトカーボンを使用したこと以外は実施例2と同じ条件であるが、パイリングの評価が悪くなっている。比較例7は澱粉の比率がホワイトカーボンに対して高いのでパイリングの評価は良くなっているが、白色度、不透明度の上昇が無く、セットオフの評価が悪くなっている。比較例8は、炭酸カルシウムを使用したこと以外は、実施例4と同じ条件であるが、白色度は低下し、不透明度の上昇も小さい結果となっている。  Comparative Example 5 has the same conditions as Example 1 except that white carbon was used, but the evaluation of the piling is worse. Comparative Example 6 also has the same conditions as Example 2 except that white carbon is used, but the evaluation of the pile is worse. In Comparative Example 7, the evaluation of piling is good because the ratio of starch is high with respect to white carbon, but there is no increase in whiteness and opacity, and the evaluation of set-off is poor. Comparative Example 8 is the same conditions as Example 4 except that calcium carbonate was used, but the whiteness decreased and the increase in opacity was small.

以上に示したように、本発明の実施例では、白色度、不透明度が高く、パイリング、セットオフの発生のないオフセット印刷用新聞用紙を得ることができる。  As described above, according to the embodiment of the present invention, it is possible to obtain a newsprint for offset printing that has high whiteness and opacity, and does not generate piling and set-off.

Claims (2)

原紙上に、顔料と接着剤を含む表面処理剤を塗布、乾燥してなるオフセット印刷用新聞用紙において、
塗布装置としてゲートロールコーターを用い、
顔料の主成分が焼成カオリンであり、
接着剤の主成分が酸化澱粉であり、
表面処理剤の塗布量が片面当り0.5〜3g/m であり、
顔料と接着剤の塗布量の比率が4:6〜7:3の範囲であり、
表面処理剤の塗布濃度が10〜20%である
ことを特徴とするオフセット印刷用新聞用紙。
In newsprint paper for offset printing, which is obtained by applying a surface treatment agent containing pigment and adhesive on the base paper and drying it.
Using a gate roll coater as a coating device,
The main component of the pigment is calcined kaolin,
The main component of the adhesive is oxidized starch,
The coating amount of the surface treatment agent is 0.5 to 3 g / m 2 per side ,
The ratio of the coating amount of the pigment and the adhesive is in the range of 4: 6 to 7: 3,
The newsprint for offset printing , wherein the coating concentration of the surface treatment agent is 10 to 20% .
原紙に吸油量が150cc/100g以上の填料が0.5%以上内添されていることを特徴とする請求項に記載のオフセット印刷用新聞用紙。
2. Newsprint paper for offset printing according to claim 1 , wherein a filler having an oil absorption of 150 cc / 100 g or more is internally added to the base paper in an amount of 0.5% or more.
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JPH049237B2 (en) * 1987-12-28 1992-02-19
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JP2823941B2 (en) * 1990-06-22 1998-11-11 王子製紙株式会社 Method for producing coated newsprint
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JP2005133251A (en) * 2003-10-31 2005-05-26 Daio Paper Corp Gravure printing coated paper
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JPH049237B2 (en) * 1987-12-28 1992-02-19
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JPH09176986A (en) * 1995-12-27 1997-07-08 Nippon Paper Ind Co Ltd Filler added paper
JP2000010485A (en) * 1998-06-18 2000-01-14 Oji Paper Co Ltd Thermosensitive recording label
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