JP2007270369A - Coated paper for offset printing - Google Patents
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- JP2007270369A JP2007270369A JP2006095131A JP2006095131A JP2007270369A JP 2007270369 A JP2007270369 A JP 2007270369A JP 2006095131 A JP2006095131 A JP 2006095131A JP 2006095131 A JP2006095131 A JP 2006095131A JP 2007270369 A JP2007270369 A JP 2007270369A
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本発明は、オフセット印刷用塗工紙に関するものである。とくにオフセット印刷後の折り加工において、折り部の強度低下が少なく、輪転印刷適性を備えた塗工紙に関するものである。 The present invention relates to a coated paper for offset printing. In particular, the present invention relates to a coated paper that is less likely to have a decrease in the strength of the folded portion in the folding process after offset printing, and that is suitable for rotary printing.
近年、印刷物のカラー化、高ビジュアル化に伴い、画質の良好な印刷用塗工紙の需要が増大している。雑誌本文用紙、小冊子、パンフレット等に使用されるこれら印刷用塗工紙は高速オフセット印刷に耐えうる表面強度と優れた印刷適性の実現が求められている。一方でコスト削減を目的に高速オフセット、とくに高速オフセット輪転印刷への対応が求められている。これらの印刷用塗工紙は印刷工程のあとに折り加工が行われるが、とくに商業用の輪転印刷では印刷後にインキ乾燥工程が入るため、塗工紙の水分が失われてもろくなり、直後の折り加工により折り部の強度が低下し、針綴じ製本したときのセンターページが脱落する、あるいは観音開きのページで繰り返し開閉した場合に折り部が破れることがある。また、この折部の強度低下はもともと強度の低い低坪量で、原紙の割合の低い高塗工量の塗工紙で顕著に見られる。そのため、折加工後も強度低下の小さい塗工紙が望まれている。
In recent years, the demand for coated paper for printing with good image quality has increased with the colorization and high visualization of printed matter. These coated coated papers used for magazine text papers, booklets, pamphlets and the like are required to have surface strength that can withstand high-speed offset printing and excellent printability. On the other hand, there is a demand for high-speed offset, particularly high-speed offset rotary printing, for cost reduction. These printing coated papers are folded after the printing process, but especially in commercial rotary printing, since the ink drying process is performed after printing, the moisture of the coated paper is lost and becomes brittle. The strength of the folded portion is reduced by the folding process, and the center page when the booklet is bound may be dropped, or the folded portion may be broken when it is repeatedly opened and closed on the double-page spread page. In addition, the decrease in strength of the folded portion is remarkably observed in coated paper having a low basis weight, which is originally low in strength, and a high coating amount, in which the ratio of the base paper is low. For this reason, a coated paper having a small decrease in strength even after folding is desired.
折加工時に塗工紙の折り部分の塗工層に亀裂が入る、あるいは塗工層が完全に破壊され原紙層が露出するいわゆる折り割れを防止する方法については以下のように種々の試みが提案されているが、これらは比較的厚手の塗工紙についての見た目の悪さを改善する目的で提案されたもので乾燥直後に折加工された場合の折り部の強度については言及されていない。 Various attempts have been made to prevent so-called cracking in which the coated layer in the folded part of the coated paper is cracked during folding, or the coated layer is completely destroyed and the base paper layer is exposed. However, these have been proposed for the purpose of improving the unsatisfactory appearance of relatively thick coated paper, and no mention is made of the strength of the folded part when it is folded immediately after drying.
折り割れを防止する方法については、例えば、塗工原紙にカチオン化澱粉とポリアクリルアミドを内添する方法が記載されている（特許文献１参照）。塗工紙を調湿した場合の耐折強度は向上しているが、輪転印刷で高熱でのインキ乾燥工程が入る場合など塗工紙の水分が失われた状態での折り部の強度は不十分であった。 As a method for preventing the folding, for example, a method of internally adding cationized starch and polyacrylamide to a coated base paper is described (see Patent Document 1). Folding resistance is improved when humidity is applied to the coated paper, but the strength of the folded part is not good when the moisture of the coated paper is lost, such as when a high-temperature ink drying process is performed in rotary printing. It was enough.
また、塗工紙のＪＩＳ Ｐ ８１４２による引張強度の縦横比（Ｔ／Ｙが）１．５以上、縦方向の破断伸びが２．５％以上でＪＡＰＡＮ ＴＡＰＰＩ Ｎｏ．１８による内部結合強さが２．０ｋｇｆ・ｃｍ以下とする方法が記載されている（特許文献２参照）。低湿度の環境下での折り目の亀裂については改善されているが、やはり折り部の強度としては不十分であった。
このような状況を鑑み、本発明の課題は、オフセット印刷後の折り加工において折り部の強度低下が少ない塗工紙を提供することである。 In view of such a situation, an object of the present invention is to provide a coated paper in which the strength of the folded portion is less reduced in the folding process after offset printing.
本発明者らは、鋭意検討した結果、表面強度改善のために行われる原紙へ外添サイズの処方に工夫を加えることにより問題を解決することに成功し、本発明を完成させた。 As a result of intensive studies, the present inventors have succeeded in solving the problem by adding a device to the prescription of the externally added size to the base paper performed for improving the surface strength, and completed the present invention.
本発明は、原紙上に、顔料と接着剤を有する塗工層を設けたオフセット印刷用塗工紙において、原紙に重量平均分子量が８０万以上の澱粉を主成分とする表面処理剤の塗布層を有し、さらにその上に前記塗工層を設けたことを特徴とするオフセット印刷用塗工紙を提供する。 The present invention relates to a coating paper for offset printing in which a coating layer having a pigment and an adhesive is provided on a base paper, and a coating layer of a surface treatment agent mainly composed of starch having a weight average molecular weight of 800,000 or more on the base paper. There is further provided a coated paper for offset printing, wherein the coated layer is further provided thereon.
すなわち、本発明は、オフセット印刷用塗工紙において、表面強度および耐ブリスター性向上の目的で、塗工原紙には澱粉を主成分とする表面処理剤の塗布を行う。この澱粉として、重量平均分子量は８０万以上のものを用い、１００万以上の重量平均分子量を有する澱粉を使用するのが好ましい。澱粉の塗布量は、０．２〜２．５ｇ／ｍ2が好ましい。澱粉の塗布量が０．２ｇ／ｍ2より少ないと塗工紙の表面強度向上効果がじゅうぶんではなく、澱粉塗布量が２．５ｇ／ｍ2をこえると折り部の強度低下が大きくなる傾向にある。高分子量の澱粉を使用することでオフセット印刷直後の折加工における折部の強度低下が小さくなる理由は定かではないが、次のように考えられる。外添サイズの澱粉を高分子量とすることで剛性の高い澱粉が塗工原紙に浸透しにくくなり、原紙の柔軟性が維持される。つまり、折加工時の繊維の損傷が少なくなり、強度低下が小さくなる。一方で澱粉が紙表面に留まることで表面強度向上効果が高まり、澱粉の塗工量を減らして同等の表面強度を得ることができる。剛性の高い澱粉が少なくなり、原紙の柔軟性を維持するという点でさらに有利である。本発明においては、折り部の強度低下が起こりやすい、塗工紙の坪量が１１０ｇ／ｍ２以下、あるいは、塗工層の塗工量が片面当たり１５ｇ／ｍ２以上においても、折部の強度低下が少ないものである。 That is, according to the present invention, in the coated paper for offset printing, for the purpose of improving surface strength and blister resistance, a surface treatment agent mainly composed of starch is applied to the coated base paper. As this starch, it is preferable to use a starch having a weight average molecular weight of 800,000 or more and having a weight average molecular weight of 1,000,000 or more. The amount of starch applied is preferably 0.2 to 2.5 g / m 2 . When the starch coating amount is less than 0.2 g / m 2, the effect of improving the surface strength of the coated paper is not fully achieved, and when the starch coating amount exceeds 2.5 g / m 2 , the strength of the folded portion tends to decrease. is there. The reason why the decrease in strength of the folded portion in the folding process immediately after offset printing is reduced by using high molecular weight starch is not clear, but is considered as follows. By making the externally added size starch have a high molecular weight, it becomes difficult for starch with high rigidity to penetrate into the coated base paper, and the flexibility of the base paper is maintained. That is, the damage of the fiber at the time of folding is reduced, and the strength reduction is reduced. On the other hand, when the starch stays on the paper surface, the effect of improving the surface strength is enhanced, and the equivalent surface strength can be obtained by reducing the coating amount of starch. It is further advantageous in that starch with high rigidity is reduced and the flexibility of the base paper is maintained. In the present invention, even when the basis weight of the coated paper is likely to be 110 g / m 2 or less, or the coating amount of the coating layer is 15 g / m 2 or more per side, There is little decrease in strength.
本発明の塗工紙はオフセット印刷後の折り加工において、折り部の強度低下が少ないオフセット印刷用塗工紙であり、かつ輪転印刷での印刷適性に優れる塗工紙である。 The coated paper of the present invention is a coated paper for offset printing in which a decrease in strength of the folded portion is small during folding after offset printing, and is excellent in printability in rotary printing.
本発明の塗工用原紙には、通常のパルプ、填料等が配合される。本発明において原紙に配合されるパルプの種類等は特に限定されない。例えば、広葉樹クラフトパルプ（以下、ＬＢＫＰとする）、針葉樹クラフトパルプ（以下、ＮＢＫＰとする）サーモメカニカルパルプ、砕木パルプ、古紙パルプ等が使用される。また、原紙に配合される填料としては、重質炭酸カルシウム、軽質炭酸カルシウム、カオリン、クレー、タルク、水和珪酸、ホワイトカーボン、酸化チタン、合成樹脂填料などの公知の填料を使用することができる。填料の使用量は、パルプ重量に対して６重量％以上が好ましい。さらに必要に応じて、硫酸バンド、サイズ剤、紙力増強剤、歩留まり向上剤、着色顔料、染料、消泡剤などを含有してもよい。原紙の抄紙方法については特に限定されるものではなく、トップワイヤー等を含む長網マシン、丸網マシン等を用いて、酸性抄紙、中性抄紙、アルカリ性抄紙方式で抄紙した原紙のいずれであってもよく、もちろん、メカニカルパルプを含む中質原紙も使用できる。また、必要に応じて原紙をスーパーカレンダー、ソフトカレンダー等の平滑化処理を前以って施しておくこともできる。原紙としては、一般の塗工紙に用いられる坪量が３０〜２００ｇ／ｍ２程度の塗工原紙を用いることができるが、好ましくは坪量が５０〜８０ｇ／ｍ２の塗工原紙である。 Ordinary pulp, filler and the like are blended in the base paper for coating of the present invention. In the present invention, the type of pulp blended into the base paper is not particularly limited. For example, hardwood kraft pulp (hereinafter referred to as LBKP), softwood kraft pulp (hereinafter referred to as NBKP) thermomechanical pulp, groundwood pulp, waste paper pulp and the like are used. Further, as fillers to be blended in the base paper, known fillers such as heavy calcium carbonate, light calcium carbonate, kaolin, clay, talc, hydrated silicic acid, white carbon, titanium oxide, synthetic resin filler, etc. can be used. . The amount of filler used is preferably 6% by weight or more based on the pulp weight. Further, if necessary, a sulfuric acid band, a sizing agent, a paper strength enhancer, a yield improver, a color pigment, a dye, an antifoaming agent and the like may be contained. There is no particular limitation on the paper making method of the base paper, and any of the base papers made by acid paper making, neutral paper making, alkaline paper making using a long net machine including a top wire, a round net machine, etc. Of course, medium base paper containing mechanical pulp can also be used. Further, if necessary, the base paper can be subjected to a smoothing process such as a super calendar or a soft calendar in advance. As the base paper, a base paper having a basis weight of about 30 to 200 g / m 2 used for general coated paper can be used, but a base paper having a basis weight of 50 to 80 g / m 2 is preferable. .
本発明おいて、表面強度向上の目的で、塗工原紙には澱粉を主成分とする表面処理剤の塗布を行う。澱粉としては、酸化澱粉、ヒドロキシエチルエーテル化澱粉、酵素変性澱粉、等の、表面処理剤として通常使用されるものを単独、あるいはこれらの混合物を使用することができる。澱粉の塗布量は、０．２〜２．５ｇ／ｍ2が好ましく、より好ましくは、０．３〜２．０ｇ／ｍ2である。また、表面処理剤の中には、澱粉のほかに耐水化、表面強度向上を目的とした紙力増強剤やサイズ性付与を目的とした外添サイズ剤を添加することができる。表面処理剤は２ロールサイズプレスコーターや、ゲートロールコーター、ブレードメタリングサイズプレスコーター、およびロッドメタリングサイズプレスコーターなどのフィルム転写型ロールコーター等の塗工機によって塗布することができる。塗工機はゲートロールコーターなどのフィルム転写型ロールコーターを使用することが好ましい。フィルム転写型ロールコーターで塗工した場合、２ロールサイズプレスコーターと比較して表面処理剤が紙表面に留まりやすいため、低塗布量で高い表面強度をもつ塗工紙が得られ、塗布量を低くすることで折り部の強度低下はより小さくなる。 In the present invention, for the purpose of improving the surface strength, a surface treatment agent mainly composed of starch is applied to the coated base paper. As the starch, those usually used as a surface treatment agent such as oxidized starch, hydroxyethyl etherified starch, enzyme-modified starch and the like can be used alone or a mixture thereof. The coating amount of starch is preferably 0.2 to 2.5 g / m 2 , more preferably 0.3 to 2.0 g / m 2 . In addition to starch, a paper strength enhancer for the purpose of water resistance and surface strength improvement and an external sizing agent for the purpose of imparting size can be added to the surface treatment agent. The surface treatment agent can be applied by a coating machine such as a two-roll size press coater, a film transfer type roll coater such as a gate roll coater, a blade metering size press coater, and a rod metalling size press coater. The coating machine is preferably a film transfer type roll coater such as a gate roll coater. When coated with a film transfer type roll coater, the surface treatment agent tends to stay on the paper surface compared to a two-roll size press coater, resulting in a coated paper having a high surface strength with a low coating amount. By lowering, the strength reduction of the folded portion becomes smaller.
また、塗工層に設ける顔料としてはとくに限定されるものではなく、塗工紙用に従来から用いられている、カオリン、クレー、デラミネーテッドクレー、重質炭酸カルシウム、軽質炭酸カルシウム、タルク、二酸化チタン、硫酸バリウム、硫酸カルシウム、酸化亜鉛、ケイ酸、ケイ酸塩、コロイダルシリカ、サチンホワイトなどの無機顔料、プラスチックピグメントなどの有機顔料を、必要に応じて１種類以上を選択して使用できる。 In addition, the pigment provided in the coating layer is not particularly limited, and conventionally used for coated paper, kaolin, clay, delaminated clay, heavy calcium carbonate, light calcium carbonate, talc, One or more inorganic pigments such as titanium dioxide, barium sulfate, calcium sulfate, zinc oxide, silicic acid, silicate, colloidal silica, and satin white, and organic pigments such as plastic pigment can be selected and used as necessary. .
塗工層に使用する接着剤は、特に限定されるものではなく、塗工紙用に従来から用いられているスチレン・ブタジエン系、スチレン・アクリル系、エチレン・酢酸ビニル系、ブタジエン・メチルメタクリレート系、酢酸ビニル・ブチルアクリレート系等の各種共重合体およびポリビニルアルコール、無水マレイン酸共重合体、アクリル酸・メチルメタクリレート系共重合体等の合成系接着剤、カゼイン、大豆蛋白、合成蛋白の蛋白質類、酸化澱粉、陽性澱粉、尿素リン酸エステル化澱粉、ヒドロキシエチルエーテル化澱粉などのエーテル化澱粉、デキストリンなどの澱粉類、カルボキシエチルセルロース、ヒドロキシエチルセルロースまたはヒドロキシメチルセルロースなどのセルロース誘導体などの通常の塗工紙接着剤１種類以上を適宜選択して使用される。これらの接着剤は顔料１００重量部に対して５〜５０重量部、より好ましくは５〜３０重量部程度の範囲で使用される。 The adhesive used for the coating layer is not particularly limited, and styrene / butadiene series, styrene / acrylic series, ethylene / vinyl acetate series, butadiene / methyl methacrylate series conventionally used for coated papers. , Various copolymers such as vinyl acetate / butyl acrylate, and synthetic adhesives such as polyvinyl alcohol, maleic anhydride copolymer, acrylic acid / methyl methacrylate copolymer, casein, soy protein, and synthetic protein proteins Ordinary coated paper such as oxidized starch, positive starch, urea phosphated starch, etherified starch such as hydroxyethyl etherified starch, starches such as dextrin, cellulose derivatives such as carboxyethylcellulose, hydroxyethylcellulose or hydroxymethylcellulose Select one or more types of adhesives as appropriate It is used in. These adhesives are used in an amount of about 5 to 50 parts by weight, more preferably about 5 to 30 parts by weight with respect to 100 parts by weight of the pigment.
さらに助剤として必要に応じて、分散剤、増粘剤、保水剤、消泡剤、着色剤、離型剤、流動変性剤、耐水化剤、防腐剤、印刷適性向上剤など、通常の塗工紙用塗料組成物に配合される各種助剤が適宜使用される。 In addition, if necessary as a auxiliaries, it is possible to use ordinary coatings such as dispersants, thickeners, water retention agents, antifoaming agents, colorants, mold release agents, flow modifiers, water resistance agents, preservatives, and printability improvers Various auxiliaries blended in the coating composition for industrial paper are appropriately used.
調製された塗料組成物を原紙に塗工するための方法としては、２ロールサイズプレスコーターや、ゲートロールコーター、およびブレードメタリングサイズプレスコーターおよびロッドメタリングサイズプレスコーター、シムサイザー、ＪＦサイザー等のフィルム転写型ロールコーターや、フラデッドニップ／ブレードコーター、ジェットファウンテン／ブレードコーター、ショートドウェルタイムアプリケート式コーターの他、ブレードの替わりにグルーブドロッド、プレーンロッド等を用いたロッドメタリングコーターや、エアナイフコーター、カーテンコーターまたはダイコーター等の公知のコーターにより塗工することができる。塗工量は、原紙の片面あたり５〜３０ｇ／ｍ２が好ましく、より好ましくは１５〜２５ｇ／ｍ２である。塗工層は必要に応じて1層あるいは2層以上の層を設け、多層とすることも可能である。なお、多層にする場合、各の塗工液は同一組成である必要はなく、とくに限定されるものではない。また、白紙光沢、平滑性向上、および印刷光沢度向上等のため、乾燥された塗工紙を平滑化などの表面処理を行う。表面処理の方法としては弾性にコットンロールを用いたスーパーカレンダーや、弾性ロールに合成樹脂ロールを用いたソフトニップカレンダー、ブラシ掛け等公知の表面処理装置を用いることができる。 As a method for coating the prepared coating composition on the base paper, a two-roll size press coater, a gate roll coater, a blade metalling size press coater, a rod metalling size press coater, a shim sizer, a JF sizer, etc. In addition to film transfer type roll coater, flooded nip / blade coater, jet fountain / blade coater, short dwell time application type coater, rod metering coater using grooved rod, plain rod etc. instead of blade, It can coat with well-known coaters, such as an air knife coater, a curtain coater, or a die coater. The coating amount is preferably 5 to 30 g / m 2 , more preferably 15 to 25 g / m 2 per side of the base paper. The coating layer may be multi-layered by providing one layer or two or more layers as required. In addition, when making it into a multilayer, each coating liquid does not need to be the same composition, and is not specifically limited. In addition, in order to improve white paper gloss, smoothness, and print gloss, surface treatment such as smoothing the dried coated paper is performed. As the surface treatment method, a known surface treatment apparatus such as a super calender using a cotton roll for elasticity, a soft nip calender using a synthetic resin roll for the elastic roll, or a brushing can be used.
以下に実施例をあげて、本発明を具体的に説明するが、本発明はそれらに限定されるものではない。また、例中の部および％は特に断らない限り、それぞれ重量部および重量％を示す。得られた塗工紙について、以下に示すような評価法に基づいて試験を行った。
＜評価方法＞
（澱粉の分子量測定） 水系ＧＰＣによりプルラン換算で分子量を測定した。
（坪量） ＪＩＳ Ｐ ８１２４：１９９８に従った。
（王研透気度） ＪＡＰＡＮ Ｔａｐｐｉ Ｎｏ．５ 王研透気度試験機で測定した。
（折り部の強度測定） オフセット輪転機(東芝製Ｂ２Ｔ−６００)を使用し、印刷速度５００ｒｐｍで印刷し、紙面温度１３０℃で乾燥させた直後に折加工を行った印刷物について、ＴＡＰＰＩＴ４７０ ｏｍ−８９に準じて、折り部の強度を測定した。
（耐ブリスター性） オフセット輪転機(東芝製Ｂ２Ｔ−６００)を使用し、印刷速度５００ｒｐｍで印刷し、紙面温度を上げていき、ブリスターが発生したときの温度をブリスター発生温度とした。
（ドライピック） ＲＩ−ＩＩ型印刷試験機を用い、東洋インキ製造株式会社製枚葉プロセスインキ（商品名：ＳＭＸタックグレード２０）を０．４０ｃｃ使用して印刷を行ったのち印刷面を台紙に写し取った。写し取った台紙から以下のように表面強度を評価した。
○；表面の剥けはほどんど見られない。
△；表面の剥けが若干認められるが、使用上は問題ない。
×；表面の剥けが酷く、使用できない。
［実施例１］
製紙用パルプとして化学パルプを１００部、填料として軽質炭酸カルシウム１２部含有する坪量５０ｇ／ｍ２の原紙にヒドロキシメチル化澱粉(商品名：ＰＧ−２７０／ペンフォードガム社製、重量平均分子量１００万)１０％としたサイズ液を塗工量が両面２ｇ／ｍ２となるように2ロール型サイズプレスで塗工し、顔料として炭酸カルシウム１００部からなる顔料に、バインダーとしてスチレン−ブタジエン共重合体ラテックス（以下ＳＢＲと略す）４．５部、澱粉５．５部を加え、さらに水を加えて固形分濃度６５％に調整した塗工液を塗工量が片面あたり８ｇ／ｍ２となるように、ブレードコーターで両面を塗工、乾燥し、その上層に顔料として炭酸カルシウム６０部、カオリン３０部、密実プラスチックピグメント１０部からなる顔料に、分散剤としてポリアクリル酸ソーダ０．１部、バインダーとしてＳＢＲ９．５部、澱粉３．５部を加え、さらに水を加えて固形分濃度６０％に調整した塗工液を塗工量が片面あたり１０ｇ／ｍ２となるように、ブレードコーターで両面を塗工、乾燥した。この後、スーパーカレンダーによる表面処理を行い、オフセット印刷用塗工紙を得た。
［実施例２］
サイズ液として、ヒドロキシメチル化澱粉(商品名：ＰＧ−２６０／ペンフォードガム社製、重量平均分子量１５０万)７％を使用した以外は、実施例１と同様の方法でオフセット印刷用塗工紙を得た。
［実施例３］
原紙坪量を７０ｇ／ｍ２としたほかは、実施例１と同様の方法でオフセット印刷用塗工紙を得た。
［実施例４］
サイズ液として、ヒドロキシメチル化澱粉(商品名：ＰＧ−２７０／ペンフォードガム社製、重量平均分子量１００万)５％を使用し、塗工量が両面１ｇ／ｍ２となるようにした以外は、実施例１と同様の方法でオフセット印刷用塗工紙を得た。
［実施例５］
サイズ液として、ヒドロキシメチル化澱粉(商品名：ＰＧ−２７０／ペンフォードガム社製、重量平均分子量１００万)５％を使用し、塗工量が両面０．４ｇ／ｍ２となるようにゲートロールコーターで塗工した以外は、実施例１と同様の方法でオフセット印刷用塗工紙を得た。
［比較例１］
サイズ液に含まれる澱粉として、酸化澱粉(商品名：ＳＫ−２０／日本コーンスターチ社製、重量平均分子量 ６４万)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塗工紙を得た。
［比較例２］
サイズ液に含まれる澱粉として、酸化澱粉(商品名：ＰＧ−２８０／ペンフォードガム社製、重量平均分子量６３万)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塗工紙を得た。
［比較例３］
サイズ液として、酸化澱粉(商品名：ＳＫ−２０／日本コーンスターチ社製、重量平均分子量６４万)５％とし、澱粉塗工量を両面１．０ｇ／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塗工紙を得た。
Hereinafter, the present invention will be described in detail with reference to examples, but the present invention is not limited thereto. Moreover, unless otherwise indicated, the part and% in an example show a weight part and weight%, respectively. The obtained coated paper was tested based on the following evaluation method.
<Evaluation method>
(Measurement of molecular weight of starch) The molecular weight was measured in terms of pullulan by aqueous GPC.
(Weight) According to JIS P 8124: 1998.
(Oken Air Permeability) JAPAN Tappi No. 5 Measured with Oken Air Permeability Tester.
(Measurement of strength of folded portion) TAPIT 470 om-89 for a printed material that was printed immediately after being printed at a printing speed of 500 rpm using an offset rotary press (Toshiba B2T-600) and dried at a paper surface temperature of 130 ° C. According to the above, the strength of the folded part was measured.
(Blister resistance) Using an offset rotary press (Toshiba B2T-600), printing was performed at a printing speed of 500 rpm, the paper surface temperature was raised, and the temperature when the blister was generated was defined as the blister generation temperature.
(Dry pick) Using a RI-II type printing tester, printing was performed using 0.40cc of Toyo Ink Mfg. Co., Ltd. sheet-fed process ink (trade name: SMX tack grade 20), and the printed surface was used as a mount I copied it. The surface strength was evaluated from the copied mount as follows.
○: The peeling of the surface is hardly seen.
Δ: Some peeling of the surface is observed, but there is no problem in use.
X: The surface is severely peeled off and cannot be used.
[Example 1]
100 parts of chemical pulp as a papermaking pulp, base paper hydroxymethyl starch having a basis weight of 50 g / m 2 containing 12 parts of precipitated calcium carbonate as a filler (trade name: PG-270 / Penford Gum Co., weight average molecular weight 100 10) 10% sizing solution was applied with a two-roll type size press so that the coating amount was 2 g / m 2 on both sides, and a pigment consisting of 100 parts of calcium carbonate as a pigment and a styrene-butadiene copolymer as a binder. 4.5 parts of combined latex (hereinafter abbreviated as SBR) and 5.5 parts of starch are added, and water is further added to adjust the coating liquid to a solid content concentration of 65%, resulting in a coating amount of 8 g / m 2 per side. As shown in the figure, a face consisting of 60 parts of calcium carbonate, 30 parts of kaolin, and 10 parts of a solid plastic pigment as a pigment is coated on both sides with a blade coater and dried. In addition, 0.1 part of sodium polyacrylate as a dispersant, 9.5 parts of SBR and 3.5 parts of starch as a binder, and water are further added to adjust the solid content concentration to 60%. Both surfaces were coated and dried with a blade coater so as to be 10 g / m 2 per side. Thereafter, a surface treatment was performed with a super calendar to obtain a coated paper for offset printing.
[Example 2]
Coated paper for offset printing in the same manner as in Example 1, except that 7% of hydroxymethylated starch (trade name: PG-260 / Penford Gum Co., Ltd., weight average molecular weight 1,500,000) was used as the sizing solution. Got.
[Example 3]
A coated paper for offset printing was obtained in the same manner as in Example 1 except that the basis weight of the base paper was 70 g / m 2 .
[Example 4]
Except for using 5% hydroxymethylated starch (trade name: PG-270 / Penford Gum, weight average molecular weight 1 million) as the sizing solution, and making the coating amount 1 g / m 2 on both sides. A coated paper for offset printing was obtained in the same manner as in Example 1.
[Example 5]
As sizing solution, hydroxymethylated starch (trade name: PG-270 / Penford Gum Co., weight average molecular weight of 1,000,000) using 5% gate, as the coating amount is double-sided 0.4 g / m 2 A coated paper for offset printing was obtained in the same manner as in Example 1 except that coating was performed with a roll coater.
[Comparative Example 1]
A coated paper for offset printing was obtained in the same manner as in Example 1 except that the starch contained in the sizing liquid was oxidized starch (trade name: SK-20 / manufactured by Nippon Cornstarch Co., Ltd., weight average molecular weight 640,000). It was.
[Comparative Example 2]
The offset printing coated paper was prepared in the same manner as in Example 1 except that the starch contained in the sizing liquid was oxidized starch (trade name: PG-280 / manufactured by Penford Gum Co., Ltd., weight average molecular weight 630,000). Obtained.
[Comparative Example 3]
Example 1 except that the sizing liquid was oxidized starch (trade name: SK-20 / manufactured by Nippon Cornstarch Co., Ltd., weight average molecular weight 640,000) 5%, and the starch coating amount was 1.0 g / m 2 on both sides. A coated paper for offset printing was obtained in the same manner.
Claims (4)
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| Application Number | Priority Date | Filing Date | Title |
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| JP2006095131A JP4908036B2 (en) | 2006-03-30 | 2006-03-30 | Coated paper for offset printing |
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| JP2006095131A JP4908036B2 (en) | 2006-03-30 | 2006-03-30 | Coated paper for offset printing |
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| JP2010189793A (en) * | 2009-02-17 | 2010-09-02 | Nippon Paper Industries Co Ltd | Coated paper for printing, and method for producing the same |
| JP2010237613A (en) * | 2009-03-31 | 2010-10-21 | Nippon Paper Industries Co Ltd | Electrophotographic transfer paper and method of manufacturing the same |
| JP2010265572A (en) * | 2008-12-22 | 2010-11-25 | Kao Corp | Surface-finishing agent for coated base paper |
| JP2015502999A (en) * | 2011-11-18 | 2015-01-29 | ロケット・フルーレ | Coating color based on high molecular weight partially soluble dextrin |
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| JP4908036B2 (en) | 2012-04-04 |
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