JP2006097149A - Lightly coated wrapping paper - Google Patents

Lightly coated wrapping paper Download PDF

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JP2006097149A
JP2006097149A JP2004281899A JP2004281899A JP2006097149A JP 2006097149 A JP2006097149 A JP 2006097149A JP 2004281899 A JP2004281899 A JP 2004281899A JP 2004281899 A JP2004281899 A JP 2004281899A JP 2006097149 A JP2006097149 A JP 2006097149A
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paper
wrapping paper
coating
coating layer
printing
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JP4549796B2 (en
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Atsushi Horai
淳 寳耒
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Daio Paper Corp
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Daio Paper Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a lightly coated wrapping paper enabling precision printing while effectively suppressing the cracking of the coated layer and the peeling of the coated layer from base paper and having strength, flexibility and processability suitable as a wrapping paper. <P>SOLUTION: The lightly coated wrapping paper T has coated layers 2 on both surfaces of a base paper 1 and has a basis weight of 100-500 g/m<SP>2</SP>. The coating weight of the coated layer 2 is 1-10 g/m<SP>2</SP>per one surface. The base paper 1 is formed by using softwood pulp in an amount of ≥50 wt.% based on the total amount of pulp and has a longitudinal/lateral tensile strength ratio of ≥1.7 determined in conformity to JIS P 8113 on a specimen left at 23°C and 50% RH for 24 hours. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、印刷等の美匠性が施される紙製手提げ袋などに用いられる微塗工包装紙に関する。   The present invention relates to a finely coated wrapping paper used for a paper handbag that is provided with aesthetics such as printing.

近年、印刷物の視覚化や多色化が進み、印刷物の高級化や高速化に伴い印刷用紙に対する要求も多様化している。品質面においても多様化が見られるようになっており、これがグレードの細分化をもたらし、品質要求が年々厳しくなってきている。
このようななか、印刷済みの紙製手提げ袋などに用いられる包装紙においても、その美匠化が求められていることから、高精細な印刷を行えることが強く要求されている。このため、従来から、カレンダー掛け、ニス引き、ラミネート加工などの後加工を行ったり、光沢インキを用いて印刷を行ったりすることが公然実施されていた。ところが、カレンダー掛けを行ったものは印刷適性が充分とはいえず、またニス引き、ラミネート加工、光沢インキによる印刷は、コストが高くつき、また加工効率も悪いという欠点がある。このようなことから、最近では、塗工技術の進歩に伴い、例えば両面当たり30g/m程度の塗工量で塗工してなる塗工層を有する包装紙を用いることが公然実施されている。
In recent years, the visualization and multicolorization of printed materials have progressed, and the demand for printing paper has been diversified as the quality of printed materials has increased and the speed has been increased. In terms of quality, diversification has been seen. This has led to subdivision of grades, and quality requirements have become stricter year by year.
Under such circumstances, wrapping paper used for printed paper handbags and the like is also required to be aesthetically crafted, so that high-definition printing is strongly demanded. For this reason, conventionally, post-processing such as calendaring, varnishing, laminating, or printing using gloss ink has been publicly performed. However, the calendering is not sufficient for printability, and varnishing, laminating, and printing with glossy ink have the disadvantages of high cost and poor processing efficiency. For this reason, recently, with the advancement of coating technology, for example, it has been publicly used to use a wrapping paper having a coating layer formed by coating at a coating amount of about 30 g / m 2 per both sides. Yes.

ところで、印刷等の美匠性が施される包装紙には、印刷適性やインクの着肉性などの印刷特性のほかに、包装紙としての強度や柔軟性、加工適性などが要求される。すなわち、印刷後製袋加工により得られる包装紙には、印刷特性と、包装紙としての機能を充分に発揮するための特性とを兼ね備えることが求められている。また、高精細な印刷を実現するためには塗工層を厚くすれば実現しやすくなるが、厚くすればするほど製袋加工時や荷物の搬送時などにおいて塗工層の割れや剥離が生じやすくなるという問題がある。逆に、塗工層の割れや剥離を抑制するためには、塗工層を薄くすれば実現しやすくなるが、薄くすればするほど高精細な印刷が行いにくくなる。このため、高精細な印刷を可能としつつ、塗工層に割れが生じたり、紙基材から塗工層が剥離してしまったりするのを有効に抑制することも求められている。   By the way, the wrapping paper to which the aesthetics such as printing is applied is required to have strength, flexibility, processing suitability, etc. as a wrapping paper, in addition to printing characteristics such as printability and ink inking property. That is, the wrapping paper obtained by the bag-making process after printing is required to have both printing characteristics and characteristics for fully exhibiting the function as the wrapping paper. Also, in order to achieve high-definition printing, it becomes easier to achieve by increasing the coating layer, but the thicker the coating layer, the more the coating layer cracks or peels off during bag making processing or when carrying packages. There is a problem that it becomes easy. On the other hand, in order to suppress cracking and peeling of the coating layer, it becomes easier to achieve by making the coating layer thinner, but the thinner the coating layer, the more difficult it becomes to perform high-definition printing. For this reason, while enabling high-definition printing, it is also required to effectively suppress the occurrence of cracks in the coating layer and the separation of the coating layer from the paper substrate.

本発明はこのような事情に鑑みなされたものであり、塗工層に割れが生じたり、紙基材から塗工層が剥離してしまったりするのを有効に抑制しつつ、高精細な印刷を行うことができ、さらに包装紙としての強度や柔軟性、加工適性をも備えた微塗工包装紙の提供をその目的とする。   The present invention has been made in view of such circumstances, and high-definition printing while effectively suppressing the occurrence of cracks in the coating layer or the peeling of the coating layer from the paper substrate. The object of the present invention is to provide a finely coated wrapping paper having strength, flexibility and processability as a wrapping paper.

本発明の微塗工包装紙は、紙基材の少なくとも片面に塗工層が形成された微塗工包装紙であって、坪量が100〜500g/mの範囲内に設定され、前記塗工層は、顔料と接着剤とを含有する塗工液が片面当たり1〜10g/mの塗工量で塗工されて形成され、前記紙基材は、針葉樹クラフトパルプがパルプ材料全量に対し50重量%以上用いて形成されているとともに、温度23℃で湿度50%RHの環境下で24時間放置後のJIS P 8113に準じて測定される縦横引張り強度の比(縦/横)が1.7以上に設定されていることを特徴としている。 The finely coated wrapping paper of the present invention is a finely coated wrapping paper in which a coating layer is formed on at least one side of a paper substrate, and the basis weight is set within a range of 100 to 500 g / m 2 , The coating layer is formed by coating a coating liquid containing a pigment and an adhesive at a coating amount of 1 to 10 g / m 2 per side, and the paper base material is a total amount of pulp material of softwood kraft pulp. The ratio of the longitudinal and transverse tensile strength measured according to JIS P 8113 after being left for 24 hours in an environment with a temperature of 23 ° C. and a humidity of 50% RH (length / width) Is set to 1.7 or more.

上記の構成によれば、坪量が前記した特定の範囲内に設定されているので、強度的にも実使用上も問題がない。また、塗工層が前記した所定の塗工量で形成されているので、高精細な印刷を実現しながらも、塗工層の割れや剥離を抑制することができる。さらに、紙基材は針葉樹クラフトパルプを主成分とし、さらに縦横引張り強度の比が特定の範囲に設定されていることから、包装紙としての強度や柔軟性、さらには加工適性をも確保したものとなる。このように、微塗工包装紙の坪量、所定の塗工量で形成された塗工層、針葉樹クラフトパルプを主成分とし、縦横引張り強度の比が特定の範囲に設定された紙基材とすることで、これらが相俟って、本発明の微塗工包装紙は、印刷後製袋加工により得られる紙製手提げ袋などの包装紙として適切なものとなる。   According to said structure, since basic weight is set in the above-mentioned specific range, there is no problem in intensity | strength and practical use. Moreover, since the coating layer is formed with the above-mentioned predetermined coating amount, cracking and peeling of the coating layer can be suppressed while realizing high-definition printing. In addition, the paper base is composed of softwood kraft pulp as the main component, and the ratio of longitudinal and transverse tensile strength is set within a specific range, ensuring the strength and flexibility as wrapping paper, as well as processability. It becomes. As described above, the basis weight of the finely coated wrapping paper, the coating layer formed with a predetermined coating amount, and the paper base material in which the ratio of the longitudinal and transverse tensile strengths is set to a specific range based on the softwood kraft pulp Thus, in combination, the finely coated wrapping paper of the present invention is suitable as a wrapping paper such as a paper handbag obtained by bag making after printing.

また、上記微塗工包装紙において、JIS P 8115に準じて測定される折り曲げ回数が40回以上であり、JIS P 8131に準じて測定される比破裂強さが2.00kPa・m/g以上であるのが好ましい。この場合、荷物の搬送などに使用される印刷後製袋加工により得られる紙製手提げ袋などとしてより一層適したものとなる。 Further, in the fine coated wrapping paper, the number of bendings measured according to JIS P 8115 is 40 times or more, and the specific burst strength measured according to JIS P 8131 is 2.00 kPa · m 2 / g. The above is preferable. In this case, the paper bag is more suitable as a paper handbag obtained by post-printing bag making processing used for transporting goods.

本発明によれば、微塗工包装紙の坪量が特定の範囲内に設定され、塗工層が所定の塗工量で形成され、紙基材が針葉樹クラフトパルプを主成分とし、縦横引張り強度比が特定の範囲に設定されているので、塗工層が割れてしまったり、紙基材から塗工層が剥離してしまったりするのを有効に抑制しつつ、高精細な印刷を行うことができ、さらに包装紙としての強度や柔軟性、加工適性をも備えた微塗工包装紙を提供することができる。このため、印刷後製袋加工により得られる紙製手提げ袋などの包装紙として好適に用いることができる。   According to the present invention, the basis weight of the finely coated wrapping paper is set within a specific range, the coating layer is formed with a predetermined coating amount, the paper base material is a softwood kraft pulp as a main component, and longitudinal and lateral tensile Since the strength ratio is set within a specific range, high-definition printing is performed while effectively preventing the coating layer from cracking or peeling off from the paper substrate. Furthermore, it is possible to provide a finely coated wrapping paper having strength, flexibility and processability as a wrapping paper. For this reason, it can use suitably as wrapping paper, such as a paper handbag obtained by the bag making process after printing.

以下、本発明の好ましい実施形態について図面を参照しつつ説明する。図1は、本発明の一実施形態に係る微塗工包装紙を示す断面図である。本実施形態に係る微塗工包装紙Tは、紙基材1と、その両面に形成された塗工層2とを備えている。   Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing a finely coated wrapping paper according to an embodiment of the present invention. The fine coating wrapping paper T according to the present embodiment includes a paper base 1 and a coating layer 2 formed on both surfaces thereof.

紙基材1は、針葉樹クラフトパルプをパルプ材料全体に対し50重量%以上含むものが用いられる。より好ましくは65重量%以上である。すなわち、太くて長い針葉樹クラフトパルプを主成分とする原紙を用いるようにする。太くて長い針葉樹クラフトパルプとしては、ダグラスファーのチップから得られる針葉樹パルプが好適に利用できる。特に、ダブルディスクリファイナー(DDR)などを用いて繊維長が短くならないような条件、いわゆる粘状で叩解し、フィブリル化したものが好適に用いられる。粘状叩解は、リファイナーのプレートをカッティングが生じ難いパターンを設定することで可能となり、数平均繊維長が2.1〜3.0mm程度の叩解が好ましい。ここで、本発明でいう叩解は、一般的なカッティング叩解(繊維を長さ方向に切断しやすい叩解)や粘状叩解(繊維を長さ方向に切断せず幅方向に解きほぐす叩解)のうちの粘状叩解を高度に進めたものである。なお、粘状叩解かカッティング叩解かは叩解機により一義的に決まるものではなく、先述したように使用する刃、ローター又はディスクなどの材質、形状、間隙、パルプ濃度、叩解速度、時間などにより決定される。ここで、本発明に使用できる叩解機としては、ビーター、コニカル型リファイナー、ドラム型リファイナー、ディスク型リファイナーなどがあげられる。なかでも、比較的粘状叩解を行いやすいという点で、ドラム型リファイナー、ディスク型リファイナーが好適である。特に、ドラム型リファイナーにおいては、円筒型のローターおよびステーターの材質として、ストーンが好ましい。   As the paper substrate 1, one containing 50% by weight or more of softwood kraft pulp with respect to the whole pulp material is used. More preferably, it is 65% by weight or more. That is, a base paper mainly composed of thick and long softwood kraft pulp is used. As thick and long softwood kraft pulp, softwood pulp obtained from Douglas fir chips can be suitably used. In particular, a fiber fibrillated and fibrillated under conditions that do not shorten the fiber length using a double disc refiner (DDR) or the like is preferably used. Viscous beating is possible by setting a pattern in which the refiner plate is less likely to be cut, and preferred is beating with a number average fiber length of about 2.1 to 3.0 mm. Here, the beating referred to in the present invention is one of general cutting beating (beating that facilitates cutting the fiber in the length direction) and viscous beating (beating that unravels the fiber in the width direction without cutting the fiber in the length direction). It is a highly advanced mucus beating. It should be noted that it is not uniquely determined by the beating machine, but it is determined by the material, shape, gap, pulp concentration, beating speed, time, etc. of the blade, rotor or disk used as described above. Is done. Here, beaters that can be used in the present invention include beaters, conical refiners, drum refiners, disc refiners, and the like. Among these, a drum type refiner and a disk type refiner are preferable in that they are relatively easy to perform viscous refining. In particular, in a drum type refiner, stone is preferable as the material of the cylindrical rotor and the stator.

上記紙基材1のパルプ材料は、針葉樹クラフトパルプだけであってもよいが、通常、広葉樹クラフトパルプ、脱墨パルプ、古紙パルプなどの他のパルプ材料と併せて用いられる。また、パルプ材料には、サイズ剤、ポリアクリルアミド系紙力増強剤等の紙力増強剤、染料、硫酸バンド、pH調整剤などの各種の添加剤が添加される。原紙の抄紙方法としては、特に制限するものではなく、ツインワイヤーフォーマーマシン、長網マシン、より好ましくは原紙から塗工層の形成及び塗工層の平坦化処理までを一連の工程で行うことができるオンラインマシンを用いた方法等を適宜に採用することができる。
また、本発明で用いられる針葉樹クラフトパルプとしては、繊維粗度が16〜28mg/100m、数平均繊維長が2.4〜2.8mmに設定されているものが好適に用いられる。繊維粗度が16mg/100m未満であると包装紙における形状安定性が損なわれるおそれがあり、逆に28mg/100mを超えると、製袋適性が悪化するだけでなく、製袋加工後に折り部の破断が生じやすくなる傾向があるからである。より好適な繊維粗度は20〜26mg/100mである。数平均繊維長は繊維粗度の算出に供されるように密接な係わり合いがあり、2.4mm未満では包装紙における強度不足を来す傾向があり、2.8mmを超えると製袋適性に問題が生じやすくなる傾向がある。なお、繊維粗度は、繊維の太さ/細さを示す指標であり、繊維100m当たりの重量をmgで表すものである。よって、繊維粗度が小さいほど繊維が細いことを意味する。この繊維粗度は繊維長分布測定装置KAJAANIFS−100によって計測に要した繊維数と繊維重量、計測された数平均繊維長から容易に測定することができる。
The pulp material of the paper substrate 1 may be only softwood kraft pulp, but is usually used in combination with other pulp materials such as hardwood kraft pulp, deinked pulp, and waste paper pulp. In addition, various additives such as a sizing agent, a paper strength enhancer such as a polyacrylamide-based paper strength enhancer, a dye, a sulfuric acid band, and a pH adjuster are added to the pulp material. The paper making method of the base paper is not particularly limited, and is a twin wire former machine, a long net machine, and more preferably a series of steps from base paper to coating layer formation and coating layer flattening. A method using an on-line machine that can be used is appropriately adopted.
In addition, as the softwood kraft pulp used in the present invention, those having a fiber roughness of 16 to 28 mg / 100 m and a number average fiber length of 2.4 to 2.8 mm are preferably used. If the fiber roughness is less than 16 mg / 100 m, the shape stability of the wrapping paper may be impaired. Conversely, if the fiber roughness exceeds 28 mg / 100 m, not only the bag-making suitability is deteriorated but also the folded portion after the bag-making process is deteriorated. This is because breakage tends to occur. A more preferable fiber roughness is 20 to 26 mg / 100 m. The number average fiber length is closely related to the calculation of the fiber roughness, and if it is less than 2.4 mm, it tends to cause insufficient strength in the wrapping paper. Problems tend to occur. The fiber roughness is an index indicating the thickness / thinness of the fiber, and represents the weight per 100 m of the fiber in mg. Therefore, the smaller the fiber roughness is, the thinner the fiber is. This fiber roughness can be easily measured from the number of fibers required for measurement by the fiber length distribution measuring device KAJANIFS-100, the fiber weight, and the measured number average fiber length.

そして、紙基材1は、温度23℃で湿度50%RHの環境下で24時間放置後のJIS P 8113に準じて測定される縦横引張り強度の比(縦/横)が1.7以上に設定されている。より好ましくは、2.0以上である。縦横引張り強度比が大きいと、包装物の搬送時などの強度を確保できるともに、加工適性、包装紙としての柔軟性をも確保することができるからである。ここで、縦横引張り強度の比(縦/横)を1.7以上に設定する方法としては、ヘッドボックスからワイヤー上の抄紙原料を吐出する際のジェットワイヤー比を調整する方法が好適に採用されるほか、抄紙原料吐出濃度を抄紙幅方向に渡り調整可能な濃度調整インレットを使用する方法などがあげられる。   The paper base material 1 has a longitudinal / lateral tensile strength ratio (longitudinal / horizontal) of 1.7 or more measured according to JIS P 8113 after being left for 24 hours in an environment of a temperature of 23 ° C. and a humidity of 50% RH. Is set. More preferably, it is 2.0 or more. This is because, when the longitudinal / lateral tensile strength ratio is large, the strength at the time of transporting the package can be secured, and the suitability for processing and the flexibility as a wrapping paper can be secured. Here, as a method for setting the ratio of longitudinal and transverse tensile strength (longitudinal / lateral) to 1.7 or more, a method of adjusting the jet wire ratio when discharging the papermaking raw material on the wire from the head box is suitably employed. In addition, there is a method of using a density adjusting inlet capable of adjusting the papermaking material discharge density in the papermaking width direction.

塗工層2を形成するために用いられる塗工液としては、主成分として顔料及び接着剤を含有しているものが用いられる。
顔料としては、公知の各種のものを適宜に選択して用いることができる。具体的には、炭酸カルシウム(重質炭酸カルシウム、軽質炭酸カルシウム)、デラミネーテッドクレー、焼成クレー、サチンホワイト、二酸化チタン、水酸化アルミニウム、酸化亜鉛、硫酸バリウム、水酸化カルシウム、硫酸カルシウム、亜硫酸カルシウム、炭酸マグネシウム、水酸化マグネシウム、ベントナイト、セリサイト、シリカ、タルク、活性白土等の無機顔料や、ポリスチレン樹脂微粒子、尿素ホルマリン樹脂微粒子、微小中空粒子、多孔質粒子等の有機顔料を用いることができる。これらは、単独であるいは2種以上併せて用いることができる。なかでも、炭酸カルシウム、クレーを用いるのが好ましい。そして、顔料は、塗工液の固形分濃度が50〜70%程度となる適宜の割合で使用される。
As a coating liquid used for forming the coating layer 2, a coating liquid containing a pigment and an adhesive as main components is used.
Various known pigments can be appropriately selected and used as the pigment. Specifically, calcium carbonate (heavy calcium carbonate, light calcium carbonate), delaminated clay, calcined clay, satin white, titanium dioxide, aluminum hydroxide, zinc oxide, barium sulfate, calcium hydroxide, calcium sulfate, sulfurous acid Use inorganic pigments such as calcium, magnesium carbonate, magnesium hydroxide, bentonite, sericite, silica, talc, activated clay, and organic pigments such as polystyrene resin fine particles, urea formalin fine particles, fine hollow particles, and porous particles. it can. These can be used alone or in combination of two or more. Of these, calcium carbonate and clay are preferably used. And a pigment is used in the appropriate ratio from which the solid content concentration of a coating liquid will be about 50 to 70%.

接着剤としては、特に制限するものではないが、水溶性接着剤が好適に用いられる。具体的には、酸化澱粉、陽性澱粉、エステル化澱粉、デキストリンなどの澱粉類、ポリビニルアルコール(PVA)などの合成樹脂接着剤、カゼイン、大豆蛋白、合成蛋白などの蛋白類等があげられる。また、スチレン−ブタジエン共重合体などの共役ジエン系共重合体ラテックス、アクリル酸エステルの重合体又は共重合体などのアクリル系共重合体ラテックス、エチレン−酢酸ビニル共重合体などのビニル系重合体ラテックス、あるいはこれらの重合体ラテックスをカルボキシル基などの官能基含有単量体で変性したアルカリ溶解性、アルカリ膨潤性あるいはアルカリ非溶解性の重合体ラテックスなどを用いてもよい。これらの接着剤は、単独であるいは2種以上併せて用いられる。そして、接着剤の配合割合は、使用する接着剤の種類などによって適宜に設定されるが、通常、顔料100重量部に対して5〜30重量部の範囲内に設定されているのが好ましい。5重量部未満であると所定の接着力が得られないおそれがあり、逆に30重量部を超えると塗工性に悪影響を及ぼすおそれがあるからである。   Although it does not restrict | limit especially as an adhesive agent, A water-soluble adhesive agent is used suitably. Specific examples include oxidized starches, positive starches, esterified starches, starches such as dextrin, synthetic resin adhesives such as polyvinyl alcohol (PVA), proteins such as casein, soy protein, and synthetic proteins. Also, conjugated diene copolymer latex such as styrene-butadiene copolymer, acrylic copolymer latex such as acrylate polymer or copolymer, and vinyl polymer such as ethylene-vinyl acetate copolymer. Latex, or alkali-soluble, alkali-swellable or alkali-insoluble polymer latex obtained by modifying these polymer latexes with a functional group-containing monomer such as a carboxyl group may be used. These adhesives may be used alone or in combination of two or more. And the compounding ratio of an adhesive agent is suitably set by the kind etc. of the adhesive agent to be used, However, It is preferable to set normally in the range of 5-30 weight part with respect to 100 weight part of pigments. This is because if the amount is less than 5 parts by weight, a predetermined adhesive force may not be obtained, and if it exceeds 30 parts by weight, the coatability may be adversely affected.

なお、本発明で用いられる塗工液には、上記した各成分のほか、保水剤、分散剤、増粘剤、潤滑剤、消泡剤、耐水化剤、着色剤、pH調整剤などの従来公知の各種の助剤を使用目的やニーズに応じて適宜に配合することができる。   In addition to the above-mentioned components, the coating liquid used in the present invention includes conventional water retention agents, dispersants, thickeners, lubricants, antifoaming agents, water resistance agents, colorants, pH adjusters and the like. Various known auxiliaries can be appropriately blended according to the purpose of use and needs.

本実施形態に係る微塗工包装紙Tは、例えば、つぎのようにして製造することができる。すなわち、まず、上記紙基材1と塗工液とを準備したのち、紙基材1の両面に塗工液を片面当たり1〜10g/mの塗工量で塗工する。ここで、塗工処理は、ブレードコーター、バーコーター、ロールコーター、エアナイフコーター、リバースロールコーター、カーテンコーターなど各種の公知の塗工装置を用いて行うことができる。そして、塗工量は、上述のとおり、片面当たり1〜10g/mの範囲内に設定する。このような微塗工としたのは、片面当たり10g/mを超えると塗工層2が厚くなりすぎて、製袋加工や荷物の搬送時などにおいて、塗工層2に割れが生じたり、紙基材1から塗工層2が剥離してしまったりするからである。逆に、片面当たり1g/m未満であると、塗工層2が薄いために紙基材1の主成分である針葉樹クラフトパルプが塗工層2から露出してしまい、高精細な印刷に悪影響を及ぼすからである。ここで、塗工液の塗工量は、包装紙の表面平滑性、不透明度、隠蔽性、塗工層の柔軟性などをも考慮して、片面当たり2.5〜7.0g/mの範囲内に設定されているのが好ましい。 The finely coated wrapping paper T according to the present embodiment can be manufactured as follows, for example. That is, first, after preparing the paper base material 1 and the coating liquid, the coating liquid is applied on both sides of the paper base material 1 at a coating amount of 1 to 10 g / m 2 per side. Here, the coating treatment can be performed using various known coating apparatuses such as a blade coater, a bar coater, a roll coater, an air knife coater, a reverse roll coater, and a curtain coater. And as above-mentioned, a coating amount is set in the range of 1-10 g / m < 2 > per single side | surface. Such fine coating is because the coating layer 2 becomes too thick when it exceeds 10 g / m 2 per side, and the coating layer 2 is cracked during bag making processing or when carrying a baggage. This is because the coating layer 2 is peeled off from the paper substrate 1. On the other hand, if it is less than 1 g / m 2 per side, since the coating layer 2 is thin, the softwood kraft pulp that is the main component of the paper substrate 1 is exposed from the coating layer 2, so that high-definition printing is possible. This is because it has an adverse effect. Here, the coating amount of the coating liquid is 2.5 to 7.0 g / m 2 per side in consideration of the surface smoothness, opacity, concealability, and flexibility of the coating layer of the wrapping paper. It is preferable to set within the range.

塗工が完了した後、熱風加熱、蒸気加熱、赤外線ヒータ加熱、ガスヒータ加熱、電気ヒータ加熱などの公知の各種の加熱乾燥方式により乾燥を行う。なお、乾燥条件については、加熱乾燥方式や塗工液の配合などに応じて適宜に調整される。その後、熱ソフトカレンダー、スーパーカレンダーなどの各種の公知の平滑化処理装置を用いて、塗工時や乾燥時に生じた微細な凹凸を潰して表面を平滑化する。こうして、本実施形態に係る微塗工包装紙Tを得ることができる。なお、本実施形態に係る微塗工包装紙Tは、原紙から塗工層の形成及び塗工層の平坦化処理までを一連の工程で行うことができるオンラインマシンを用いて製造してもよいのは勿論である。   After the coating is completed, drying is performed by various known heat drying methods such as hot air heating, steam heating, infrared heater heating, gas heater heating, and electric heater heating. In addition, about drying conditions, it adjusts suitably according to a heat drying system, the mixing | blending of a coating liquid, etc. Thereafter, the surface is smoothed by crushing fine irregularities generated during coating or drying using various known smoothing processing devices such as a thermal soft calender and a super calender. Thus, the fine coating wrapping paper T according to the present embodiment can be obtained. Note that the finely coated wrapping paper T according to the present embodiment may be manufactured using an online machine that can perform a series of steps from base paper to formation of a coating layer and flattening of the coating layer. Of course.

こうして得られた本実施形態の微塗工包装紙Tは、坪量が100〜500g/mの範囲内に設定されている。すなわち、あまりに坪量が小さすぎると紙製手提げ袋などに用いられる包装紙の強度が足りないからであり、逆に大きすぎると加工が極めて困難になるとともに、実使用に不適だからである。換言すれば、上記範囲内であれば、実使用に適すとともに、必要な強度を確保した包装紙を提供することができるからである。ここで、微塗工包装紙Tの坪量は、強度面と使用面とのバランスを考慮して、110〜450g/mの範囲内に設定されているのがより好適である。 The finely coated wrapping paper T of the present embodiment thus obtained has a basis weight set in the range of 100 to 500 g / m 2 . That is, if the basis weight is too small, the strength of the wrapping paper used for the paper handbag is insufficient. On the other hand, if the basis weight is too large, the processing becomes extremely difficult and unsuitable for actual use. In other words, if it is within the above range, it is possible to provide a wrapping paper that is suitable for actual use and has a required strength. Here, the basis weight of the finely coated wrapping paper T is more preferably set in the range of 110 to 450 g / m 2 in consideration of the balance between the strength surface and the usage surface.

上記のように構成された本実施形態の微塗工包装紙Tは、坪量が100〜500g/mの範囲内に設定されているので、強度面や使用面で適切なものとなる。また、塗工層2が片面当たり1〜10g/mの範囲内の塗工量で形成されているので、高精細な印刷を実現しながらも、塗工層2が割れてしまったり、紙基材1から塗工層2が剥離してしまったりするのを有効に抑制することができる。さらに、紙基材1は針葉樹クラフトパルプを主成分とし、さらに前記した縦横引張り強度の比が2.0以上に設定されていることから、包装紙としての強度や柔軟性、さらには加工適性をも確保したものとなる。このように、微塗工包装紙Tの坪量、所定の塗工量で形成された塗工層2、針葉樹クラフトパルプを主成分とし、縦横引張り強度の比が特定の範囲に設定された紙基材1とすることで、これらが相俟って、本実施形態の微塗工包装紙Tは、印刷後製袋加工により得られる紙製手提げ袋などの包装紙として適切なものとなる。 Since the basis weight is set within the range of 100 to 500 g / m 2 , the finely coated wrapping paper T of the present embodiment configured as described above is appropriate in terms of strength and usage. Moreover, since the coating layer 2 is formed with a coating amount within a range of 1 to 10 g / m 2 per side, the coating layer 2 may be broken while realizing high-definition printing, It can suppress effectively that the coating layer 2 peels from the base material 1. FIG. Furthermore, since the paper base material 1 is mainly composed of softwood kraft pulp and the ratio of the above-mentioned longitudinal and transverse tensile strengths is set to 2.0 or more, the strength and flexibility as a wrapping paper, and further the processing suitability. Is also secured. As described above, the paper having the basis weight of the fine coating wrapping paper T, the coating layer 2 formed with a predetermined coating amount, and the softwood kraft pulp as the main components and the ratio of the longitudinal and transverse tensile strengths set to a specific range. By using the base material 1 in combination, the finely coated wrapping paper T of the present embodiment is suitable as a wrapping paper such as a paper handbag obtained by post-printing bag making.

そして、本実施形態の微塗工包装紙Tは、JIS P 8115に準じて測定される折り曲げ回数が40回以上で、かつ、JIS P 8131に準じて測定される比破裂強さが2.00kPa・m/g以上に設定されているのが好ましい。すなわち、上記折り曲げ回数が40回以上で、かつ上記比破裂強さが2.00kPa・m/g以上であれば、荷物の搬送時や製袋加工などにおいて充分な強度を備え、印刷後製袋加工により得られる紙製手提げ袋などの包装紙としてより適したものとなるからである。ここで、微塗工包装紙Tは、上記折り曲げ回数が60回以上で、かつ、上記比破裂強さ2.10kPa・m/g以上に設定されているのがより好ましい。なお、折り曲げ回数や破裂強さの設定数値を確保するためには、前述した、粘状叩解が非常に重要となる。 And the fine coating wrapping paper T of this embodiment has a folding number of 40 or more measured according to JIS P 8115 and a specific burst strength measured according to JIS P 8131 of 2.00 kPa. -It is preferable to set it to m < 2 > / g or more. In other words, if the number of bending times is 40 times or more and the specific burst strength is 2.00 kPa · m 2 / g or more, it has sufficient strength during the transportation of baggage and bag making processing, and is manufactured after printing. It is because it becomes more suitable as wrapping paper, such as a paper handbag obtained by bag processing. Here, it is more preferable that the fine coating wrapping paper T is set to have the above folding number of 60 times or more and the specific burst strength of 2.10 kPa · m 2 / g or more. Note that the above-mentioned viscous beating is very important in order to secure the set values of the number of bendings and the burst strength.

なお、本発明は上記実施形態に限定するものではない。例えば、塗工層2は紙基材1の両面でなく片面のみに形成されてあってもよい。また、塗工層2は単層に限らず2層以上の多層構造であってもよいし、紙基材1も単層からなる原紙に限らず、異種又は同種の原紙を重ね合わせて2層以上の多層構造にしたものであってもよい。
また、本発明の微塗工包装紙は、紙製手提げ袋、紙袋、封筒、箸袋などの紙製の袋体の他、被包装物をラッピングするラッピング紙などとして使用することができる。
In addition, this invention is not limited to the said embodiment. For example, the coating layer 2 may be formed not only on both sides of the paper substrate 1 but only on one side. The coating layer 2 is not limited to a single layer but may have a multilayer structure of two or more layers, and the paper substrate 1 is not limited to a single layer of base paper, and two layers of different or similar types of base papers are stacked. It may have a multilayer structure as described above.
Further, the finely coated wrapping paper of the present invention can be used as a wrapping paper for wrapping an object to be wrapped in addition to a paper bag such as a paper handbag, a paper bag, an envelope or a chopstick bag.

以下に実施例及び比較例を挙げて本発明をより具体的に説明するが、本発明はこれらの実施例に限定されるものではない。
(実施例1)
針葉樹クラフトパルプ(NBKP)をナイアガラ式ビーターにて叩解し、カナディアン・スタンダード・フリーネス(C.S.F)450mlに調整した試料に硫酸バンドを1.0%添加してpH6.5とした。そして、針葉樹クラフトパルプ(繊維粗度:22mg/100m)50重量%、上物古紙50重量%となるよう配合した紙料スラリーを抄紙するにおいて、試料濃度2.0%とし、紙力増強剤としてポリアクリルアミド系紙力増強剤を対紙料固形量0.4%添加し、その後、紙料濃度1.0%として抄紙し、紙基材を製造した。ここで、得られた紙基材を23℃、50%RHの条件下に24時間調湿したのち、JIS P 8113に準じ定速緊張形引張試験機を用いて測定される縦横引張り強度の比(縦/横)が、2.23であった。
一方、顔料としての重質炭酸カルシウム50重量部及びクレー50重量部と、接着剤としてのスチレン−ブタジエン系ラテックス10重量部と、澱粉5重量部とを混合し、水で希釈して固形分濃度65%の塗工液を得た。
そして、この塗工液を用いて、上記原紙の両面に片面当たり3g/mの塗工量で塗工し、熱風加熱乾燥処理、熱ソフトカレンダー処理を行った。こうして、坪量が150g/mの微塗工包装紙を得た。
Hereinafter, the present invention will be described more specifically with reference to examples and comparative examples, but the present invention is not limited to these examples.
Example 1
Softwood kraft pulp (NBKP) was beaten with a Niagara beater, and 1.0% sulfuric acid band was added to a sample adjusted to 450 ml of Canadian Standard Freeness (CSF) to adjust the pH to 6.5. And in making paper stock slurry blended so as to be 50% by weight of softwood kraft pulp (fiber roughness: 22 mg / 100 m) and 50% by weight of used waste paper, the sample concentration is set to 2.0% as a paper strength enhancer. A polyacrylamide-based paper strength enhancer was added at 0.4% solids to the paper stock, and then paper was made at a paper stock concentration of 1.0% to produce a paper base. Here, after adjusting the humidity of the obtained paper base material under the conditions of 23 ° C. and 50% RH for 24 hours, the ratio of the longitudinal and transverse tensile strengths measured using a constant speed tension type tensile tester according to JIS P 8113 (Vertical / Horizontal) was 2.23.
On the other hand, 50 parts by weight of heavy calcium carbonate as a pigment and 50 parts by weight of clay, 10 parts by weight of styrene-butadiene latex as an adhesive, and 5 parts by weight of starch are mixed and diluted with water to obtain a solid content concentration. A 65% coating solution was obtained.
And using this coating liquid, it apply | coated to both surfaces of the said base paper with the coating amount of 3 g / m < 2 > per single side | surface, and the hot air heat drying process and the thermal soft calender process were performed. Thus, a finely coated wrapping paper having a basis weight of 150 g / m 2 was obtained.

(実施例2〜7、比較例1〜5)
後記の表1に示す他は実施例1と同様にして、各微塗工包装紙を得た。
(Examples 2-7, Comparative Examples 1-5)
Each finely coated wrapping paper was obtained in the same manner as in Example 1 except that it was shown in Table 1 below.

上記のようにして得られた実施例及び比較例の微塗工包装紙について、下記の折り曲げ回数(回)、比破裂強さ(kPa・m/g)、印刷仕上がり、塗工ムラ、印刷適性、製袋適性の各特性について測定・評価を行った。その結果を後記表1に併せて示す。 About the fine coating wrapping paper of Examples and Comparative Examples obtained as described above, the following folding times (times), specific burst strength (kPa · m 2 / g), printing finish, coating unevenness, printing Measurement and evaluation were performed for each of the characteristics of aptitude and bag making aptitude. The results are also shown in Table 1 below.

(折り曲げ回数)
JIS P 8115に準じて測定することができるMIT試験機を用いて測定した。
(比破裂強さ)
JIS P 8131に準じて測定することができるミューレン型試験機を用いて測定した。
(Number of bendings)
It measured using the MIT testing machine which can be measured according to JISP8115.
(Specific burst strength)
It measured using the mullen type testing machine which can be measured according to JIS P8131.

(印刷仕上がり)
各実施例及び比較例の微塗工包装紙に対し線数150のオフセット印刷を行った。そして、印刷状態について目視にて評価した。その結果、非常に高精細に印刷ができていたものを◎、それよりも若干劣るが充分に高精細な印刷であるといえるものを○、不充分な印刷状態であるものを×とした。
(塗工ムラ)
塗工層に塗工ムラが生じている度合いを目視にて評価した。明らかにムラが生じているものを×、ムラが生じているものの実用上問題がないといえるものを○、ムラが殆ど見られないものを◎とした。
(Printing finish)
Offset printing with a line number of 150 was performed on the finely coated wrapping paper of each Example and Comparative Example. And the printing state was evaluated visually. As a result, ◎ was printed with very high definition, ◯ was slightly inferior to that but could be said to be sufficiently high-definition printing, and X was insufficient.
(Coating unevenness)
The degree of occurrence of coating unevenness in the coating layer was visually evaluated. The case where the unevenness was clearly generated was indicated as x, the case where the unevenness was generated but that could be said to have no practical problem was indicated as ◯, and the case where the unevenness was hardly observed was indicated as ◎.

(印刷適性)
明製作所製RI印刷適性試験機にて、タック6のオフセットインクを用い、マクベス印字濃度で1.3になるようにベタ印刷を施し、印刷面のインク着肉ムラ、インク着肉ローラーへの塗工層の取られを目視にて評価した。インク着肉ローラーへの塗工層の取られ、インク着肉ムラが生じているものを×、僅かに着肉ムラが見られるものの実使用上問題がないといえるものを○、着肉ムラも見られないものを◎とした。
(製袋適性)
各実施例及び比較例の微塗工包装紙を用い、オフセット印刷にて黒一色の印刷を施した後、製袋加工所にて、底辺が幅115mm、長さ320mm、高さ450mmの角底袋(手提げ袋)を加工し、加工状況、折部の印刷の割れを目視にて評価した。その結果、加工装置における紙折と貼合における不良の発生、印刷部の割れ(白いひび割れ)の発現が生じていたものを×、殆ど問題が生じていなかったものを○、全く問題が生じていなかったものを◎とした。
(Printability)
Using the offset printing ink of tack 6 and solid printing so that the Macbeth printing density is 1.3 with an RI printing aptitude test machine manufactured by Meisei Seisakusho. The removal of the work layer was visually evaluated. X indicates that the coating layer on the ink landing roller is removed and ink unevenness is generated, X indicates that there is slight unevenness, but there is no problem in actual use ○ Those that could not be seen were marked ◎.
(Bag making suitability)
Using the finely coated wrapping paper of each example and comparative example, after printing in black with offset printing, at the bag making shop, the bottom has a width of 115 mm, a length of 320 mm, and a height of 450 mm The bag (handbag) was processed, and the processing status and cracks in printing at the folded portion were evaluated visually. As a result, the occurrence of defects in paper folding and bonding in the processing device, the occurrence of cracks in the printed part (white cracks) x, the case where almost no problem occurred, ○, no problem occurred The ones that did not exist were marked ◎.

Figure 2006097149
Figure 2006097149

表1の結果から、各実施例の微塗工包装紙は、各比較例の微塗工包装紙に比べて、塗工層の割れや剥離を生ずることなく、印刷仕上がりが良好であることが確認できる。
実施例1の微塗工包装紙は、塗工液の塗工量が3.0g/mで微塗工でありながらも、良好な印刷適性と製袋適性とを備えていることが確認できた。また、実施例2の微塗工包装紙は、折り曲げ回数が73回で比破裂強度が2.4kPa・m/gであることから、特に製袋適性が良好であることが確認できる。さらに、実施例3の微塗工包装紙は、塗工液の塗工量が10g/mで針葉樹クラフトパルプの配合割合が80重量%であることから、製袋適性を確保しつつ、良好な印刷仕上がり、印刷適性を実現していることが確認できる。また、実施例4の微塗工包装紙は、坪量が100g/mで針葉樹クラフトパルプの繊維粗度が16mg/100mでありながらも、特に塗工ムラの発生が抑制された良好な微塗工包装紙であることが確認できる。また、実施例5の微塗工包装紙は、実施例4と比べて針葉樹クラフトパルプの繊維粗度が大きく、縦横引張強度も大きいことから、印刷適性を確保しつつ、より製袋適性が良好なものとなっていることが確認できる。また、実施例6、7の微塗工包装紙は、それぞれ坪量が300g/m、500g/mと高く設定されているものの、良好な印刷適性や製袋適性を確保していることが確認できる。
From the results shown in Table 1, the fine coated wrapping paper of each example has a good print finish without causing cracking or peeling of the coated layer as compared with the fine coated wrapping paper of each comparative example. I can confirm.
It was confirmed that the finely coated wrapping paper of Example 1 had good printability and bag-making suitability even though it was finely coated with a coating amount of 3.0 g / m 2. did it. In addition, since the finely coated wrapping paper of Example 2 has a folding number of 73 and a specific burst strength of 2.4 kPa · m 2 / g, it can be confirmed that the bag forming suitability is particularly good. Furthermore, since the coating amount of the coating liquid of Example 3 is 10 g / m 2 and the blending ratio of the softwood kraft pulp is 80% by weight, the fine coating wrapping paper is good while ensuring bag making suitability. It can be confirmed that a good print finish and printability are realized. In addition, the finely coated wrapping paper of Example 4 has a good fineness in which the occurrence of coating unevenness is particularly suppressed while the basis weight is 100 g / m 2 and the fiber roughness of the softwood kraft pulp is 16 mg / 100 m. It can be confirmed that it is a coated wrapping paper. Further, the finely coated wrapping paper of Example 5 has higher fiber roughness of softwood kraft pulp and higher longitudinal and transverse tensile strength than Example 4, and thus has better bag-making suitability while ensuring printability. It can be confirmed that Further, fine coated wrapping paper of Example 6 and 7, although each basis weight is set as high as 300g / m 2, 500g / m 2, it is ensured a good printability and bag-making aptitude Can be confirmed.

これに対して、比較例1の微塗工包装紙は、坪量が75g/mと小さく縦横引張り強度が1.65と小さく、さらに比破裂強さが1.9kPa・m/gと小さいので、製袋適性が悪いことが確認できる。また、比較例2の微塗工包装紙は、坪量が550g/mと大きく縦横引張り強度が1.56と小さく、さらに折り曲げ回数が37回で比破裂強さが1.8kPa・m/gと小さいので、塗工ムラが発生し、製袋適性が悪いことが確認できる。さらに、比較例3の微塗工包装紙は、塗工層を形成していないため、印刷仕上がりが悪いことが確認できる。また、比較例4の微塗工包装紙は、塗工液の塗工量が12g/mと多すぎるため、印刷仕上がりが良好であるものの、製袋適性が悪いことが確認できる。比較例5の微塗工包装紙は、塗工液の塗工量が0.5/mと少なすぎるため、製袋適性が良好であるものの、印刷仕上がり、塗工ムラ、印刷適性が悪いことが確認できる。 On the other hand, the finely coated wrapping paper of Comparative Example 1 has a basis weight as small as 75 g / m 2 and a small longitudinal and transverse tensile strength as small as 1.65, and further has a specific burst strength of 1.9 kPa · m 2 / g. Since it is small, it can be confirmed that the bag-making suitability is poor. Further, the finely coated wrapping paper of Comparative Example 2 has a large basis weight of 550 g / m 2 and a small longitudinal and transverse tensile strength of 1.56, and further has a number of folding times of 37 and a specific burst strength of 1.8 kPa · m 2. Since it is as small as / g, coating unevenness occurs and it can be confirmed that the bag making suitability is poor. Furthermore, since the fine coating wrapping paper of Comparative Example 3 does not form a coating layer, it can be confirmed that the printing finish is poor. Moreover, since the coating amount of the coating liquid of the coating liquid of the comparative example 4 is too much as 12 g / m < 2 >, although the printing finish is favorable, it can confirm that bag-making aptitude is bad. Although the fine coating wrapping paper of Comparative Example 5 has a coating amount of 0.5 / m 2 which is too small, the bag-making suitability is good, but the printing finish, coating unevenness, and printability are poor. I can confirm that.

本発明の一実施形態に係る微塗工包装紙を示す断面図である。It is sectional drawing which shows the fine coating packaging paper which concerns on one Embodiment of this invention.

符号の説明Explanation of symbols

1 紙基材
2 塗工層
T 微塗工包装紙
1 Paper base material 2 Coating layer T Fine coating wrapping paper

Claims (2)

紙基材の少なくとも片面に塗工層が形成された微塗工包装紙であって、
坪量が100〜500g/mの範囲内に設定され、
前記塗工層は、顔料と接着剤とを含有する塗工液が片面当たり1〜10g/mの塗工量で塗工されて形成され、
前記紙基材は、針葉樹クラフトパルプがパルプ材料全量に対し50重量%以上用いて形成されているとともに、温度23℃で湿度50%RHの環境下で24時間放置後のJIS P 8113に準じて測定される縦横引張り強度の比(縦/横)が1.7以上に設定されていることを特徴とする微塗工包装紙。
A fine coated wrapping paper in which a coating layer is formed on at least one side of a paper substrate,
The basis weight is set within the range of 100 to 500 g / m 2 ,
The coating layer is formed by coating a coating liquid containing a pigment and an adhesive at a coating amount of 1 to 10 g / m 2 per side,
The paper base material is formed by using 50% by weight or more of softwood kraft pulp with respect to the total amount of the pulp material, and in accordance with JIS P 8113 after being left for 24 hours in an environment of a temperature of 23 ° C. and a humidity of 50% RH. A finely coated wrapping paper characterized in that the ratio of longitudinal and transverse tensile strengths to be measured (longitudinal / lateral) is set to 1.7 or more.
JIS P 8115に準じて測定される折り曲げ回数が40回以上であり、JIS P 8131に準じて測定される比破裂強さが2.00kPa・m/g以上である請求項1記載の微塗工包装紙。 The fine coating according to claim 1, wherein the number of bendings measured according to JIS P 8115 is 40 times or more, and the specific burst strength measured according to JIS P 8131 is 2.00 kPa · m 2 / g or more. Engineering wrapping paper.
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008297635A (en) * 2007-05-29 2008-12-11 Daio Paper Corp Kraft paper
JP2011038187A (en) * 2009-08-06 2011-02-24 Oji Paper Co Ltd Coated wrapping paper
JP2011052342A (en) * 2009-09-02 2011-03-17 Oji Paper Co Ltd Coated wrapping paper
WO2015012167A1 (en) * 2013-07-23 2015-01-29 王子ホールディングス株式会社 Kraft paper and method for manufacturing kraft paper

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001032193A (en) * 1999-07-16 2001-02-06 Tokan Kogyo Co Ltd Readily disintegrable multilayer paper
JP2004209150A (en) * 2003-01-08 2004-07-29 Daio Paper Corp Single-ply toilet paper, and method for manufacturing the same

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001032193A (en) * 1999-07-16 2001-02-06 Tokan Kogyo Co Ltd Readily disintegrable multilayer paper
JP2004209150A (en) * 2003-01-08 2004-07-29 Daio Paper Corp Single-ply toilet paper, and method for manufacturing the same

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008297635A (en) * 2007-05-29 2008-12-11 Daio Paper Corp Kraft paper
JP2011038187A (en) * 2009-08-06 2011-02-24 Oji Paper Co Ltd Coated wrapping paper
JP2011052342A (en) * 2009-09-02 2011-03-17 Oji Paper Co Ltd Coated wrapping paper
WO2015012167A1 (en) * 2013-07-23 2015-01-29 王子ホールディングス株式会社 Kraft paper and method for manufacturing kraft paper

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