JP5073420B2 - Method for producing coated paper - Google Patents
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- JP5073420B2 JP5073420B2 JP2007224738A JP2007224738A JP5073420B2 JP 5073420 B2 JP5073420 B2 JP 5073420B2 JP 2007224738 A JP2007224738 A JP 2007224738A JP 2007224738 A JP2007224738 A JP 2007224738A JP 5073420 B2 JP5073420 B2 JP 5073420B2
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- 239000000123 paper Substances 0.000 claims description 166
- 238000000576 coating method Methods 0.000 claims description 35
- 239000011248 coating agent Substances 0.000 claims description 34
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- 239000010893 paper waste Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
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Landscapes
- Paper (AREA)
Description
本発明は、プレスパートに、脱水がフェルト−ベルトで構成されてなる少なくとも１基のシュープレスをもつ原紙抄紙部と、塗被部、ソフトカレンダーを通して塗被紙を仕上げる仕上げ部とが、一体となった抄造速度１２００ｍ／分以上の塗被紙製造装置を用いる塗被紙製造方法において、塗被紙表面の外観を良好にする技術に関するものである。 In the present invention, the press part includes a base paper making part having at least one shoe press formed by felt-belt dehydration, and a coating part and a finishing part for finishing the coated paper through a soft calendar. The present invention relates to a technique for improving the appearance of a coated paper surface in a coated paper manufacturing method using a coated paper manufacturing apparatus having a paper making speed of 1200 m / min or more.
近年印刷用紙は、チラシ、カタログ、広告、宣伝を目的とした商業印刷分野で需要が増加している。製紙メーカーにとっては、安価で安定的に需要に答えるべく、高品質を維持したまま生産性を上げることが急務となっている。 In recent years, demand for printing paper has been increasing in the field of commercial printing for the purpose of flyers, catalogs, advertisements and promotions. For paper manufacturers, there is an urgent need to increase productivity while maintaining high quality in order to meet demand stably and inexpensively.
高品質を維持したまま生産性を上げるためには、高速抄紙機で原紙を抄造し、ついでオフマシンの塗工機で原紙に塗被し、その後、平滑化・光沢付けの高温ソフトカレンダー仕上げ処理も一体化させることが適している。 In order to increase productivity while maintaining high quality, paper is made with a high-speed paper machine, then coated on the base paper with an off-machine coating machine, and then smoothed and polished with a high-temperature soft calender finishing process. Are also suitable for integration.
特に高速で抄紙する場合には、ギャップフォーマーを用いて紙層形成させ、シュープレスを２基用いるタンデムシュープレスが多用されている。タンデムシュープレスは、湿紙からの脱水を、１基目がフェルト−フェルトと２基目がフェルト−ベルトとを組み合わせた脱水機構とすることで、最終製品の幅方向の水分プロファイルを良好にするのに適している。 In particular, when making paper at high speed, a tandem shoe press that uses two shoe presses to form a paper layer using a gap former is frequently used. The tandem shoe press has a good moisture profile in the width direction of the final product by using a dewatering mechanism that combines a felt-felt on the first substrate and a felt-belt on the second substrate. Suitable for
プレス後、湿紙は乾燥され、途中、澱粉、ポリアクリルアマイド等の紙力剤がオフセット印刷時の紙剥けを防止するために通常ゲートロールコータ、シムサイザー等のフィルムサイザーによって塗布され、すなわち、原紙に紙力剤が外添され、乾燥、塗被前のプレカレンダーで平滑化されて後、ブレードコータによって塗料を表裏塗被され、その後乾燥、ソフトカレンダー等によって平滑化処理されて塗被紙が完成する。 After pressing, the wet paper is dried, and on the way, a paper strength agent such as starch or polyacrylamide is usually applied by a film sizer such as a gate roll coater or shim sizer to prevent paper peeling during offset printing. The paper strength agent is externally added to the surface, dried and smoothed with a pre-calender before coating, and then coated with a blade coater on the front and back, then dried and smoothed with a soft calender, etc. Complete.
このように、ギャップフォーマー、タンデムシュープレス、フィルムサイザー、そしてブレードコータを連続して組み合わせるオンマシンの製造工程は、高効率で高品質の塗被紙を生産するのに適していて、最近では多く使用されている。 Thus, the on-machine manufacturing process, which combines gap former, tandem shoe press, film sizer, and blade coater in succession, is suitable for producing high-efficiency, high-quality coated paper, and recently Many are used.
ところで従来、塗被紙をオフセット輪転印刷（以下、「オフ輪印刷」と略す。）したときに発生するヒジワ（オフ輪印刷で用紙の流れ方向に沿って発生するシワ状の波打ちのことであり、以下、「オフ輪ジワ」と略す。）の問題がある。 Conventionally, wrinkles (wrinkle-like undulations that occur in the direction of paper flow in off-ring printing) that occur when the coated paper is subjected to offset rotary printing (hereinafter abbreviated as “off-ring printing”). Hereafter, abbreviated as “off-wheel wrinkles”).
オフ輪ジワの発生は、オフ輪印刷の乾燥工程において、画線部と非画線部の乾燥収縮量の差によってしわが発生するという考え方があり、原紙パルプのフリーネスを特定範囲にしたり、表面に特定の薬品を塗布した原紙に塗料を塗布したりすることで、塗被紙の乾燥収縮力や透気度を特定範囲にすることによって、オフ輪ジワを解消させる方法が開示されている（例えば、特許文献１を参照。）。 Off-wheel wrinkles are generated by the idea that wrinkles occur due to the difference in drying shrinkage between the image area and non-image area in the drying process of off-wheel printing. A method of eliminating off-wheel wrinkles is disclosed by applying a paint to a base paper coated with a specific chemical to make the drying shrinkage force and air permeability of the coated paper within a specific range ( For example, see Patent Document 1.)
また、オフセット輪転印刷用塗被紙において、原紙がサイズプレス処理されていない原紙又は澱粉の乾燥塗布量が両面で０．５ｇ／ｍ２以下となるようにサイズプレス処理された原紙であって、該原紙に塗料を塗被した後の塗被紙の層間強度が０．２５〜０．５４ｋＪ／ｍ２となるような塗被紙にするとオフ輪ジワが発生しないとの方法も開示されている（例えば、特許文献２を参照。）。 Moreover, in the coated paper for rotary offset printing, the base paper is a base paper that has not been subjected to size press processing, or a base paper that has been subjected to size press processing so that the dry coating amount of starch is 0.5 g / m 2 or less on both sides, There is also disclosed a method in which off-ring wrinkles do not occur when the coated paper is such that the interlayer strength of the coated paper after coating the base paper is 0.25 to 0.54 kJ / m 2 . (For example, see Patent Document 2).
オフ輪ジワと似たような現象に、塗被紙の白紙面にコックリングやヒジワと呼ばれる外観上の波打ちが発生する問題がある。ギャップフォーマー、タンデムシュープレス、フィルムサイザー、そしてブレードコータを連続して組み合わせるオンマシンの製造工程は、印刷作業性に問題がなく印刷上りが高品質であるとはいえ、塗被紙の白紙面にコックリングやヒジワなどの波打ちが発生する場合があり、このような外観上の波打ちを有する塗被紙は満足できる品質ではなく、外観上の品質の更なる向上のために波打ちの発生をなくすことが必要である。 A phenomenon similar to off-wheel wrinkles has a problem in that the appearance of rippling, called cockling or elbows, occurs on the white surface of the coated paper. Even though the on-machine manufacturing process that combines gap former, tandem shoe press, film sizer, and blade coater in succession has no problem in printing workability and high print quality, the blank surface of coated paper In this case, the coated paper having such appearance undulations is not satisfactory in quality, and the generation of undulations is further improved to further improve the appearance quality. It is necessary.
この塗被紙白紙面の波打ちは、再度、ソフトカレンダーやスーパーカレンダーで平滑化処理をしても解消できるものではない。 This undulation of the white surface of the coated paper cannot be eliminated by performing a smoothing process again with a soft calendar or a super calendar.
これらの塗被紙白紙面の波打ちは、オフ輪ジワと似たようにも考えられる。しかし、オフ輪ジワは、印刷後の画線部と非画線部の乾燥収縮量の差によってしわ状の波打ちが発生するのであって、白紙段階では波打ちが発生していないものであり、白紙で発生している波打ちとは異なる現象と考えられる。 The waviness of these coated paper blanks can be thought of as similar to off-wheel wrinkles. However, off-wheel wrinkles are wrinkled wavy due to the difference in dry shrinkage between the printed and non-imaged areas after printing, and are not generated at the white paper stage. It is thought that this phenomenon is different from the waving that occurs in
塗被紙白紙面の波打ちは、最近の高速高効率・高品質を目指したギャップフォーマー、タンデムシュープレス、フィルムサイザー、そしてブレードコータの組み合わせで発生確率が高くなってきた問題である。 Rippling of the white surface of coated paper is a problem in which the probability of occurrence has increased with the combination of a gap former, a tandem shoe press, a film sizer, and a blade coater aiming at high speed, high efficiency and high quality.
そこで本発明は、特に塗被紙の坪量が７０ｇ／ｍ２以下といった薄物塗被紙において、ギャップフォーマーと、脱水がフェルト−ベルトで構成されてなる少なくとも１基のシュープレスとを組み合わせて湿紙を形成し、該湿紙をドライヤーパートで乾燥し、該湿紙の乾燥後の紙匹に塗料を少なくとも片面に塗工機で塗被して乾燥し、かつ、平滑化仕上げを行う一連の工程を、連続して行うオンマシンコータ及び仕上げ設備をもつ塗被紙製造装置を用いる塗被紙の製造方法において、白紙面のコックリング・ヒジワが少ない塗被紙の製造方法を提供することを目的とする。 Therefore, the present invention is a combination of a gap former and at least one shoe press comprising a felt-belt for dewatering, particularly in a thin coated paper having a coated paper having a basis weight of 70 g / m 2 or less. A series of forming wet paper, drying the wet paper with a dryer part, applying the paint to the web after drying the wet paper with a coating machine on at least one side, drying, and smoothing In a coated paper manufacturing method using a coated paper manufacturing apparatus having an on-machine coater and finishing equipment that perform the above process in a continuous manner, a method for manufacturing a coated paper with less cockling and wrinkles on the white paper surface is provided. With the goal.
本発明者らは、前記に鑑み鋭意研究した結果、紙料中に内添サイズを含まず、かつ、紙力剤を外添しないで塗被紙を製造すると、ヒジワ又はコックリングと呼ばれる外観上の波打ちを防ぐことに効果があることを見出し、本発明を完成させた。すなわち、本発明に係る塗被紙の製造方法は、ギャップフォーマーと、フェルト−ベルトを含む少なくとも１基のシュープレスとを組み合わせて湿紙を形成し、該湿紙をドライヤーパートで乾燥し、該湿紙の乾燥後の紙匹に塗料を少なくとも片面に塗工機で塗被して乾燥し、かつ、平滑化仕上げを行う一連の工程を、連続して行うオンマシンコータ及び仕上げ設備をもつ塗被紙製造装置を用いる塗被紙の製造方法において、紙料中にパルプと填料と紙力剤とを必須成分として含み、かつ、内添サイズ剤を含まず、かつ、フィルムサイザーを分離して紙匹を接触させずに紙力剤を外添せず、かつ、前記塗料の塗被が１層塗りであり、白紙面の波打ちが実質的にない塗被紙を製造することを特徴とする。 As a result of diligent research in view of the above, the present inventors have found that when coated paper is produced without the internal addition size in the stock and without the external addition of paper strength agent, the appearance is called Hijiwa or cockling. As a result, the present invention has been completed. That is, in the method for producing a coated paper according to the present invention, a wet paper is formed by combining a gap former and at least one shoe press including a felt-belt, and the wet paper is dried by a dryer part. It has an on-machine coater and finishing equipment for continuously performing a series of steps of applying a paint to at least one surface of the paper web after drying the wet paper with a coating machine and drying it, and performing a smoothing finish. In a coated paper manufacturing method using a coated paper manufacturing apparatus, pulp, filler and paper strength agent are included as essential components in the stock, and no internal sizing agent is contained, and the film sizer is separated. without external addition of paper strength agent without contacting the web Te, and the coated one-layer coating der paint is, characterized in that the waving of the blank surface to produce a coated paper substantially free And
白紙面の波打ちが実質的にないとは、波打ちの発生が少なく実用上問題のないことをいう。
White paper waviness is not substantially means that no less practical problem occurrence of waviness.
本発明に係る塗被紙の製造方法では、抄造速度１２００ｍ／分以上の塗被紙製造装置を用いることが好ましい。 In the coated paper manufacturing method according to the present invention, it is preferable to use a coated paper manufacturing apparatus having a paper making speed of 1200 m / min or more.
本発明に係る塗被紙の製造方法では、前記塗料の固形分濃度が６４質量％以上であることが好ましい。 In the coated paper manufacturing method according to the present invention, the solid content concentration of the coating material is preferably 64% by mass or more.
本発明によって、特に塗被紙の坪量が７０ｇ／ｍ２以下といった薄物塗被紙において、
ギャップフォーマー、タンデムシュープレスで湿紙を形成した後、ドライヤーパートで該湿紙を乾燥し、該湿紙の乾燥後の紙匹に塗料を少なくとも片面に塗工機で塗被・乾燥し、かつ、平滑化仕上げを連続した工程内で行うオンマシンコータ及び仕上げ設備をもつ塗被紙製造装置を用いる塗被紙の製造方法において、白紙面の波打ちが少ない塗被紙を製造することができる。
According to the present invention, in particular, in a thin coated paper having a basis weight of the coated paper of 70 g / m 2 or less,
After forming the wet paper with a gap former and a tandem shoe press, the wet paper is dried with a dryer part, and the paint is applied to at least one side of the paper after drying the wet paper with a coating machine and dried. In addition, in a coated paper manufacturing method using a coated paper manufacturing apparatus having an on-machine coater and a finishing facility for performing smoothing finishing in a continuous process, a coated paper with less blank surface undulation can be manufactured. .
（作用）
まず本発明の作用について説明する。ギャップフォーマー次いでタンデムシュープレスで湿紙を形成した後、ドライヤーパートで該湿紙を乾燥した紙匹に塗料を少なくとも片面に塗工機で塗被して乾燥し、かつ、平滑化仕上げを連続した工程内で行うオンマシンコータ及び仕上げ設備をもつ抄紙機によって仕上げられた塗被紙で、何故塗被紙の白紙表面がコックリングやヒジワが発生するのかの詳細な解明はできていないが、本発明者らは原紙の乾燥収縮に起因するものと推定する。
(Function)
First, the operation of the present invention will be described. After forming wet paper with a gap former and then with a tandem shoe press, dry the wet paper with a dryer part by applying the paint on at least one side with a coating machine and drying it continuously. In the coated paper finished by the paper machine with on-machine coater and finishing equipment performed in the process, it is not possible to elucidate why the white surface of the coated paper generates cockling or crease, The inventors presume that this is caused by drying shrinkage of the base paper.
原紙にフィルムサイザーによる澱粉等を含む紙力剤の塗布、又はブレードコータによる顔料・接着剤を主とする水性塗料を塗被した場合、原紙には水の移動が起こり原紙には伸びが生じる。 When a paper strength agent containing starch or the like is applied to the base paper using a film sizer, or a water-based paint mainly composed of a pigment / adhesive is applied using a blade coater, water moves on the base paper and the base paper stretches.
その後、乾燥工程において抄紙・塗被工程のほぼ流れ方向にだけ張力が掛かった状態で収縮しながら乾燥されるが、特にギャップフォーマーとタンデムシュープレスとの組み合わせで抄紙された原紙を用いた場合、従来のオントップワイヤーで抄紙された原紙よりも紙のＴ／Ｙ伸縮比が大きいので、流れ方向にシワが走ったような塗被白紙面、すなわち、コックリングやヒジワと呼ばれる波打ちをもつ白紙面になりやすいのではないかと推定する。 Then, in the drying process, the paper is dried while shrinking with tension applied almost in the flow direction of the papermaking / coating process. However, especially when using paper made with a combination of a gap former and a tandem shoe press. Since the T / Y stretch ratio of the paper is larger than that of the base paper made with the conventional on-top wire, the coated white paper surface where wrinkles run in the flow direction, that is, white with wavyness called cock ring or wrinkle Estimate that it is likely to become paper.
このような伸び及び収縮による影響をできるだけ抑えるには、原紙へ移動する水分量をできるだけ低くする、又は伸び及び収縮が均一に起きるようにすべきと考える。 In order to suppress the influence of such elongation and shrinkage as much as possible, it is considered that the amount of moisture transferred to the base paper should be made as low as possible, or the elongation and shrinkage should occur uniformly.
原紙へ移動する水分量をできるだけ低くするため、原紙にフィルムサイザーでの澱粉等を含む紙力剤の塗布を行わないことが、白紙表面の波打ちの発生を完全に防止するという驚くべき効果を発揮することを見出した。 In order to minimize the amount of moisture transferred to the base paper, it is surprising that the paper paper is not coated with a paper strength agent containing starch, etc., in the film sizer. I found out.
また、水が移動することによる湿潤時の原紙強度の低下による塗工機での断紙を防止するため、アルケニル無水琥珀酸（ＡＳＡ）、アルキルケテンダイマー（ＡＫＤ）、ロジンサイズ剤等の内添サイズ剤を一般的に用いるが、驚くべきことに該サイズ剤も添加しないほうが塗被後の白紙表面の波打ちの発生を防止には効果的であることを見出した。 In addition, in order to prevent paper breakage in the coating machine due to a decrease in the strength of the base paper when wet due to movement of water, internal addition of alkenyl succinic anhydride (ASA), alkyl ketene dimer (AKD), rosin sizing agent, etc. Although a sizing agent is generally used, it has been surprisingly found that the addition of the sizing agent is more effective in preventing the occurrence of undulations on the white paper surface after coating.
理由は定かではないが、内添サイズ剤は水の移動を防止はできるが、局所的な内添サイズの留まりの分布があるために、局所的な繊維の伸び及び乾燥時の収縮が発生し、塗被後の白紙表面の波打ちに影響を与えていると本発明者らは考えている。 The reason is not clear, but the internal sizing agent can prevent water migration, but the local distribution of the internal size retention causes local fiber elongation and shrinkage during drying. The present inventors consider that the surface of the white paper after coating is affected.
すなわち、紙料中に内添サイズ剤を使用したり、フィルムサイザーで澱粉等の紙力剤を外添したりした後に、ブレードコータで塗料を塗被すると白紙面に波打ちが発生する場合が多いことがわかった。かくして、オンマシンコータ及び仕上げ設備をもつ塗被紙製造装置を用いる塗被紙の製造方法において、紙料中にパルプと填料と紙力剤とを必須成分として含み、かつ、内添サイズ剤を含まず、かつ、紙力剤を外添しないことによって、白紙面は波打ちの少ない塗被紙を製造することができる。 In other words, when a coating agent is applied with a blade coater after using an internal sizing agent in the stock or after adding a paper strength agent such as starch with a film sizer, undulations often occur on the white paper surface. I understood it. Thus, in a method for producing coated paper using a coated paper production apparatus having an on-machine coater and finishing equipment, pulp, filler and paper strength agent are included as essential components in the stock, and an internal sizing agent is included. By not including a paper strength agent, it is possible to produce a coated paper with less wavy on the white paper surface.
以下に本発明に係る塗被紙の製造方法の好ましい実施形態例を挙げて具体的に説明する。 Hereinafter, preferred embodiments of the method for producing coated paper according to the present invention will be described in detail.
本実施形態に係る塗被紙の製造方法は、ギャップフォーマーと、脱水がフェルト−ベルトで構成されてなる少なくとも１基のシュープレスとを組み合わせて湿紙を形成し、該湿紙をドライヤーパートで乾燥し、該湿紙の乾燥後の紙匹に塗料を少なくとも片面に塗工機で塗被して乾燥し、かつ、平滑化仕上げを行う一連の工程を、連続して行うオンマシンコータ及び仕上げ設備をもつ塗被紙製造装置を用いる塗被紙の製造方法において、紙料中にパルプと填料と紙力剤とを必須成分として含み、かつ、内添サイズ剤を含まず、かつ、紙力剤を外添しない。 The method for producing a coated paper according to the present embodiment comprises forming a wet paper by combining a gap former and at least one shoe press formed by a felt-belt for dewatering, and using the wet paper as a dryer part. An on-machine coater that continuously performs a series of steps in which a coating is applied to at least one surface of the web after drying the wet paper with a coating machine, and the smoothing finish is performed. In a coated paper manufacturing method using a coated paper manufacturing apparatus having a finishing facility, pulp includes a filler, a filler and a paper strength agent as essential components, and does not include an internal sizing agent. Do not externally add power agent.
本実施形態の原紙抄紙部であるワイヤーパート部には、高速抄紙に適したギャップフォーマーを用いる。 A gap former suitable for high-speed papermaking is used for the wire part portion which is the base paper making portion of this embodiment.
紙料は、広葉樹晒クラフトパルプ、針葉樹晒クラフトパルプ、機械パルプ、脱墨古紙パルプ等を主成分とし、白色度及び不透明度を改善するための填料、乾燥紙力を出すための紙力剤、歩留り及び濾水向上剤、蛍光染料を含む色相調整剤によって構成される一般的な配合であるが、内添サイズ剤は含有しない。 The paper stock is composed mainly of hardwood bleached kraft pulp, softwood bleached kraft pulp, mechanical pulp, deinked waste paper pulp, etc. Although it is a general composition comprised of a yield and drainage improver, and a hue adjusting agent containing a fluorescent dye, it does not contain an internal sizing agent.
原紙は、坪量としては３０〜６３ｇ／ｍ２、好ましくは３５〜５０ｇ／ｍ２で、酸性抄紙、中性抄紙又はアルカリ抄紙で抄造してもよいが、塗料の重質炭酸カルシウム配合部数が５０質量部を超えることから中性抄紙又はアルカリ抄紙が望ましい。 The base paper has a basis weight of 30 to 63 g / m 2 , preferably 35 to 50 g / m 2 , and may be made by acidic papermaking, neutral papermaking or alkaline papermaking, Since it exceeds 50 parts by mass, neutral papermaking or alkaline papermaking is desirable.
ワイヤーパートで形成され搾水された湿紙は、次いでプレスパートに移行され、更に脱水される。 The wet paper formed and squeezed by the wire part is then transferred to the press part and further dehydrated.
高速に適したプレスパートは、通常、２基のシュープレスから成り立ち、１基目は湿紙をフェルト−フェルトで挟み込み湿紙の両面から脱水させる。２基目は、フェルト−ベルトで挟み込み、湿紙の再湿潤を防ぎながら脱水させる。なお、フェルト−ベルトにすることによって幅方向の水分プロファイルが安定する利点があり、広く採用されている。 A press part suitable for high speed usually comprises two shoe presses, and the first presses wet paper with felt-felt and dehydrates both sides of the wet paper. The second is sandwiched between felt-belts and dehydrated while preventing wet paper rewetting. The felt-belt has the advantage of stabilizing the moisture profile in the width direction and is widely used.
プレスパートで脱水された湿紙は、ドライヤーパートに移行し、乾燥される。ドライヤーパートは、通常、オープンドローがないシングルデッキドライヤーが用いられる。 The wet paper dehydrated in the press part is transferred to the dryer part and dried. As the dryer part, a single deck dryer without an open draw is usually used.
ドライヤーパートで乾燥を終えた紙匹は、紙力剤をフィルムサイザーで塗布されることなく、プレカレンダー処理又はプレカレンダー未処理の後、塗被工程で片面ずつ塗液が塗被される。 The paper sheet that has been dried by the dryer part is coated with the coating liquid one side at a coating step after the pre-calender treatment or the non-pre-calender treatment without applying the paper strength agent with the film sizer.
塗被工程ではブレードによって、内添サイズ剤を含まず、かつ、フィルムサイザーを分離して紙匹を接触させないことによって紙力剤が塗布されていない原紙又は外添剤塗布装置を保有しないで抄造された紙力剤が塗布されていない原紙に片面乾燥質量で７〜１２ｇ／ｍ２の塗料が塗被される。より好ましくは、８〜１０ｇ／ｍ２を塗被する。塗被工程では両面を塗被することが好ましい。 In the coating process, the blade does not contain the internal sizing agent, and the paper sizer is separated and the paper base is not contacted by separating the film sizer so as not to hold the base paper or the external additive coating device on which the paper strength agent is not applied. The base paper not coated with the paper strength agent is coated with 7 to 12 g / m 2 of paint on a single-sided dry mass. More preferably, 8-10 g / m 2 is applied. In the coating step, it is preferable to coat both sides.
ブレードコータで塗被される塗料は、顔料、接着剤及び助剤から構成されるが、これらの配合は、塗被紙に要求される強度、印刷時の紙剥け性及び塗工操業性を満足するように、塗被紙の製造時において適宜選択される。特に、本実施形態では、原紙に紙力剤の塗布を行わず、かつ、内添サイズ剤を用いないため、強度が不足しないような塗料の配合が選択される。本実施形態での例を挙げると、顔料として重質炭酸カルシウム５０質量部以上、接着剤として澱粉１質量部〜５質量部、ラテックス５質量部〜１０質量部を用い固形分濃度を６４質量％以上とする。 Paints applied with a blade coater are composed of pigments, adhesives and auxiliaries, but these formulations satisfy the strength required for coated papers, paper peelability during printing, and coating operability. Thus, it is appropriately selected at the time of manufacturing the coated paper. In particular, in the present embodiment, since the paper strength agent is not applied to the base paper and the internal sizing agent is not used, the coating composition is selected so that the strength is not insufficient. As an example in this embodiment, 50 mass parts or more of heavy calcium carbonate as a pigment, 1 mass part to 5 mass parts of starch as an adhesive, and 5 mass parts to 10 mass parts of latex, and a solid content concentration is 64 mass%. That's it.
顔料は、重質炭酸カルシウムを５０質量部以上としているが、それ以外は必要に応じて軽質炭酸カルシウム、カオリンクレー、デラミクレー、二酸化チタン等の無機顔料、密実タイプや中空タイプのプラスチックピグメント等の有機顔料を用いることができ、必要に応じて２種類以上混合して使用する。 The pigment contains 50 parts by weight or more of heavy calcium carbonate. Otherwise, light calcium carbonate, kaolin clay, delamy clay, titanium dioxide and other inorganic pigments, solid type and hollow type plastic pigments, etc. Organic pigments can be used, and two or more kinds are mixed and used as necessary.
接着剤は、尿素燐酸エステル化澱粉、酸化澱粉等の澱粉を、塗料粘度の維持、白紙光沢度の維持のために１質量部〜５質量部を用いる。１質量部未満では、塗料粘度が低いため保水性も低く、塗工操業においてストリーク、スクラッチが発生する場合がある。５質量部を超えると白紙光沢度が低下してくる場合がある。 As the adhesive, 1 to 5 parts by mass of starch such as urea phosphate esterified starch and oxidized starch is used in order to maintain the viscosity of the paint and the glossiness of the white paper. If the amount is less than 1 part by mass, the water viscosity is low due to the low viscosity of the paint, and streaks and scratches may occur in the coating operation. If the amount exceeds 5 parts by mass, the glossiness of the blank paper may decrease.
同時に、接着剤としてスチレン−ブタジエン共重合体を主としたラテックスが５質量部〜１０質量部も併用する。５質量部未満では、印刷機上での紙剥け若しくはブランケットの汚れ又はその両方が発生しやすく塗被紙の表面強度が不十分となる場合がある。１０質量部を超えると白紙光沢度が低下、接着剤のコスト増加等が問題となる。 At the same time, 5 to 10 parts by mass of a latex mainly composed of a styrene-butadiene copolymer is used as an adhesive. If it is less than 5 parts by mass, the surface strength of the coated paper may be insufficient due to easy occurrence of paper peeling on the printing press and / or blanket contamination. If it exceeds 10 parts by mass, the glossiness of the white paper is lowered and the cost of the adhesive is increased.
助剤には、分散剤、消泡剤、保水剤、増粘剤、耐水化剤、青味顔料、青味染料及び蛍光染料が適宜用いられるが、これらの助剤も含めて塗料固形分濃度は６４質量％以上とする。６４質量％未満では、塗料中の水分が多く原紙へ移動する水の量が多くなり、塗被紙の白紙面の波打ちが発生する可能性がある。 As the auxiliary agent, a dispersant, an antifoaming agent, a water retention agent, a thickening agent, a water resistant agent, a blue tint pigment, a blue tint dye and a fluorescent dye are appropriately used. Is 64% by mass or more. If it is less than 64% by mass, the amount of water in the paint is large and the amount of water that moves to the base paper is large, and the white paper surface of the coated paper may be wavy.
このようにして塗被工程によって塗被された後、ドライヤーパートにおいて赤外線ドライヤー、エアードライヤー、シリンダードライヤー等によって乾燥された塗被紙は１００℃以上の高温、線圧１００ｋＮ／ｍ以上、好ましくは１５０〜３００ｋＮ／ｍのソフトカレンダー処理によって光沢、平滑付けの仕上げが施される。 After being coated in this way, the coated paper dried by an infrared dryer, air dryer, cylinder dryer or the like in the dryer part has a high temperature of 100 ° C. or higher, a linear pressure of 100 kN / m or more, preferably 150. A glossy and smooth finish is applied by a soft calendering process of ˜300 kN / m.
ソフトカレンダーは、金属ロールと樹脂ロールが一対のニップを形成し、４基から５基設置されて４ニップから５ニップで塗被面を処理する。 In the soft calender, a metal roll and a resin roll form a pair of nips, 4 to 5 units are installed, and the coated surface is processed by 4 to 5 nips.
本実施形態に係る塗被紙の製造方法では、抄造速度１２００ｍ／分以上、好ましくは１４００ｍ／分以上の高速の塗被紙製造装置が用いられる。 In the coated paper manufacturing method according to the present embodiment, a high-speed coated paper manufacturing apparatus having a paper making speed of 1200 m / min or more, preferably 1400 m / min or more is used.
本実施形態に係る塗被紙の製造方法では、白紙面の波打ちが実質的にない塗被紙が製造される。ここで波打ちが実質的にないとは、波打ちが僅かに認められるが、実用上問題がない程度をいう。 In the method for manufacturing a coated paper according to the present embodiment, a coated paper that is substantially free of waviness on the white paper surface is manufactured. Here, “substantially no waviness” refers to a level where no waviness is observed but there is no practical problem.
次に示す実施例を挙げて本発明を具体的に示す。なお、各実施例はテストプラントによるテスト例であることを付記する。 The following examples are given to illustrate the present invention. It should be noted that each example is a test example by a test plant.
塗被紙の品質評価は、次の方法による。
１．白紙光沢度
ＪＩＳ Ｐ ８１４２：２００５「紙及び板紙−７５度鏡面光沢度の測定方法」に準拠して測定した。
２．外観評価（波打ち評価）
ソフトカレンダー処理後の巻き取りから３０ｃｍ×６０ｃｍのサンプルを切り出し、２４時間室温で放置し、表面の外観を目視評価した。
コックリング、ヒジワ等の波打ちがないもの ○
コックリング、ヒジワ等の波打ちを若干感じるもの（実用上の下限） △
コックリング、ヒジワ等の波打ちが目立つもの（実用に耐えない） ×
３．塗工操業性の評価（ストリーク又はスクラッチの発生）
ストリーク又はスクラッチの発生のないもの ○
ストリーク又はスクラッチの発生があり、許容下限のもの（実用上の下限） △
ストリーク又はスクラッチの発生があり、許容外のもの（実用に耐えない） ×
４．耐刷力
塗被紙を所定の寸法に裁断して１０，０００枚採取し、三菱重工社製オフセット印刷機リソピア４Ｃによって１２，０００枚／時で印刷し、ブランケットの汚れ、紙向けを評価した。
紙向け・汚れなく市場性があるもの ○
紙向けはないが汚れは発生し、市場性が下限のもの（実用上の下限） △
紙向け・汚れが発生し、市場性がないもの（実用に耐えない） ×
The quality of coated paper is evaluated by the following method.
1. Blank paper glossiness
Measured according to JIS P 8142: 2005 “Paper and paperboard—Measurement method of 75 degree specular gloss”.
2. Appearance evaluation (waved evaluation)
A sample of 30 cm × 60 cm was cut out from the winding after the soft calendering treatment and left at room temperature for 24 hours, and the appearance of the surface was visually evaluated.
There is no waviness such as cock ring, hijiwa etc. ○
Something that feels undulations such as cocklings and elbows (practical lower limit) △
Conspicuous waviness such as cock ring and hijiwa (not practical) ×
3. Evaluation of coating operability (occurrence of streak or scratch)
No streak or scratch
There is a streak or scratch, and the lower limit is acceptable (practical lower limit)
Streaks or scratches are generated and not allowed (not practical) ×
4). Printing durability The coated paper was cut to a predetermined size, and 10,000 sheets were collected and printed at 12,000 sheets / hour by an offset printing machine lithopier 4C manufactured by Mitsubishi Heavy Industries, Ltd., and the blanket stain and paper were evaluated. .
For paper and with good marketability ○
Not for paper, but stains occur and the marketability is the lower limit (practical lower limit)
For paper / stains that are not marketable (not practical) ×
（実施例１）
原紙抄造のための紙料は、叩解度としてカナダ標準フリーネス（ＣＳＦ）６００ｍｌの針葉樹パルプ２０質量％と、叩解度としてＣＳＦ４５０ｍｌの広葉樹パルプ８０質量％の配合に、市販カチオン澱粉ネオタック３０Ｔ（日本食品加工社製）をパルプ１００質量部に対して０．８質量部となるように添加し、軽質炭酸カルシウムＴＰ１２１（奥多摩工業社製）を紙料中における填料率が８質量％となるように添加し、更に市販カチオン系ポリアクリルアミド歩留まり向上剤パーコール２９２（アライドコロイド社製）を紙料中で０．０３質量％となるように添加した。原紙は、ワイヤーパート部がメッツオペーパー社製ギャップフォーマー、プレスパート部がメッツオペーパー社製タンデム型シュープレスを用いて、１基目がフェルト−フェルトでのプレス脱水、２基目がフェルト−ベルトでの脱水後、オープンドローがないシングルデッキドライヤーによって乾燥させ、かつ、外添剤塗布装置においてフィルムサイザーを分離して紙匹を接触させずに紙力剤の塗布のないものが得られた。得られた原紙の坪量は、４５ｇ／ｍ２であった。その後ブレードコータによって両面乾燥質量で２３ｇ／ｍ２になるよう塗料を塗被、乾燥した。塗料は、顔料としてクレー アマゾン８８（カダム社製）４０質量部、湿式重質炭酸カルシウム カービタル９０（イメリス社製）６０質量部を用い、接着剤として尿素燐酸エステル化澱粉 ＭＳ４６００（日本食品加工社製）を３質量部とラテックス ２７８８Ｇ（ＪＳＲ社製）を９質量部とを用い、塗料固形分濃度は６５質量％であった。なお、原紙抄造工程、塗布及び乾燥工程は、すべて１６００ｍ／分の抄造速度にて実施した。その後メッツオペーパー社製ソフトカレンダー オプチソフトによって、金属ロール温度１３０℃、ニップ線圧３００ｋＮ／ｍで４ニップ通過させて塗被紙を仕上げた。ソフトカレンダー処理速度は、本生産工程と同様の１６００ｍ／分に該当するよう設定した。以上によって、実施例１の塗被紙を得た。
Example 1
The raw material for papermaking is a blend of 20% by weight of Canadian standard freeness (CSF) 600 ml of softwood pulp with a beating degree and 80% by weight of hardwood pulp with a beating degree of CSF of 450 ml. (Manufactured by Okutama Kogyo Co., Ltd.) is added so that the amount of the filler in the stock is 8% by mass. Furthermore, a commercially available cationic polyacrylamide yield improver Percoll 292 (manufactured by Allied Colloid Co.) was added in the stock so as to be 0.03% by mass. For the base paper, the wire part uses a gap former made by Metso Paper, the press part uses a tandem shoe press made by Metso Paper, and the first is felt dewatering with felt-felt, the second is felt -After dehydration on the belt, it can be dried with a single deck dryer without open draw, and a film sizer can be separated in an external additive coating device without applying a paper strength agent without contacting the web. It was. The basis weight of the obtained base paper was 45 g / m 2 . Thereafter, a paint was applied and dried by a blade coater so that the dry weight on both sides was 23 g / m 2 . The paint uses 40 parts by weight of clay Amazon 88 (made by Caddam) as a pigment and 60 parts by weight of wet heavy calcium carbonate carbital 90 (made by Imeris), and urea phosphate esterified starch MS4600 (made by Nippon Food Processing Co., Ltd.) as an adhesive. 3 parts by weight and 9 parts by weight of latex 2788G (manufactured by JSR), and the solid content concentration of the paint was 65% by weight. The base paper making process, coating and drying process were all carried out at a making speed of 1600 m / min. Thereafter, the coated paper was finished by passing 4 nips at a metal roll temperature of 130 ° C. and a nip linear pressure of 300 kN / m using a soft calender Optisoft manufactured by Metso Paper. The soft calendar processing speed was set to correspond to 1600 m / min, which is the same as in the production process. The coated paper of Example 1 was obtained by the above.
（実施例２）
塗料中の接着剤として尿素燐酸エステル化澱粉 ＭＳ４６００（日本食品加工社製）を４質量部とラテックス ２７８８Ｇ（ＪＳＲ社製）を８質量部とした以外は実施例１と同様にして、実施例２の塗被紙を得た。
(Example 2)
Example 2 was carried out in the same manner as in Example 1 except that 4 parts by mass of urea phosphate esterified starch MS4600 (manufactured by Nippon Food Processing Co., Ltd.) and 8 parts by mass of latex 2788G (manufactured by JSR) were used as the adhesive in the paint. Coated paper was obtained.
（実施例３）
塗料中の顔料としてクレー アマゾン８８（カダム社製）を２０質量部、重質炭酸カルシウム カービタル９０（イメリス社製）を８０質量部、接着剤として尿素燐酸エステル化澱粉 ＭＳ４６００（日本食品加工社製）を３質量部とラテックス ２７８８Ｇ（ＪＳＲ社製）を８質量部とし、塗料固形分濃度を６７質量％とした以外は実施例１と同様にして、実施例３の塗被紙を得た。
(Example 3)
20 parts by mass of clay Amazon 88 (manufactured by Kadam) as a pigment in the paint, 80 parts by mass of heavy calcium carbonate carbital 90 (manufactured by Imeris), and urea phosphated starch MS4600 (manufactured by Nippon Food Processing Co., Ltd.) as an adhesive 3 parts by mass, latex 2788G (manufactured by JSR) was 8 parts by mass, and the coating solid content concentration was 67% by mass.
（比較例１）
ブレードコータで塗被する前に、外添紙力剤として熱化学変性用アセチルタピオカ澱粉ＭＳ５３００（日本食品加工社製）を定法によって蒸煮して糊化後、フィルムサイザーで１０質量％の固形分濃度の塗布液を用い、乾燥質量で２ｇ／ｍ２を両面塗布して乾燥した以外は実施例１と同様にして、比較例１の塗被紙を得た。
(Comparative Example 1)
Before coating with a blade coater, acetyl tapioca starch for thermochemical modification MS5300 (manufactured by Nippon Food Processing Co., Ltd.) was steamed and gelatinized by a conventional method as an external paper strength agent, and then a solid content concentration of 10% by mass with a film sizer. A coated paper of Comparative Example 1 was obtained in the same manner as in Example 1 except that 2 g / m 2 was applied on both sides by dry mass and dried.
（比較例２）
原紙抄造のための紙料中に内添サイズ剤としてロジンサイズ剤ＮＴ−８０（荒川化学工業社製）をパルプに対して０．２質量％添加した以外は実施例１と同様にして、比較例２の塗被紙を得た。
(Comparative Example 2)
A comparison was made in the same manner as in Example 1 except that 0.2% by mass of rosin sizing agent NT-80 (manufactured by Arakawa Chemical Industries, Ltd.) was added as an internal sizing agent to the stock for papermaking. The coated paper of Example 2 was obtained.
以上の結果を表１に示した。 The above results are shown in Table 1.
表１から明らかなように、実施例１〜３は、塗工操業性及び印刷時の耐刷力が良好で、外観評価では、コックリング、ヒジワ等の波打ちの発生は、実施例１では実用上問題がない程度に少なく、実施例２及び３ではまったく認められず、外観も優れている塗被紙であった。一方、比較例１及び２は、白紙面の波打ちが目立ち、見た目の外観が劣っていた。
As is clear from Table 1, Examples 1 to 3 have good coating operability and printing durability during printing. In appearance evaluation, the occurrence of waviness such as cockling and wrinkles is practical in Example 1. It was a coated paper that was so small that there was no problem above, was not recognized at all in Examples 2 and 3, and was excellent in appearance. On the other hand, in Comparative Examples 1 and 2, the undulation of the white paper surface was conspicuous, and the appearance was inferior.
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