JP6802831B2 - Post-glue crimp recording base paper - Google Patents
Post-glue crimp recording base paper Download PDFInfo
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- JP6802831B2 JP6802831B2 JP2018226822A JP2018226822A JP6802831B2 JP 6802831 B2 JP6802831 B2 JP 6802831B2 JP 2018226822 A JP2018226822 A JP 2018226822A JP 2018226822 A JP2018226822 A JP 2018226822A JP 6802831 B2 JP6802831 B2 JP 6802831B2
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Landscapes
- Credit Cards Or The Like (AREA)
- Paper (AREA)
Description
本発明は、後糊圧着記録用原紙に関する。 The present invention relates to a base paper for post-glue crimping recording.
隠蔽、秘匿等する必要のある各種情報を印刷した上で折り畳み、対向する面を再剥離可能に圧着して形成される圧着記録用紙が従来から知られている。また、かかる圧着記録用紙としては、塗工紙表面に予め疑似接着剤層を積層しておき、この疑似接着剤層表面に各種情報を印刷した上で疑似接着剤層を対向させるように折曲げて再剥離可能に圧着する先糊方式と、塗工紙表面に印刷した後に、この印刷面に疑似接着剤層を積層し、さらにこの疑似接着剤層を対向させるように折曲げて再剥離可能に圧着する後糊方式が存在している。この点、今日では、再剥離後の接着面の質感に優れ、高級感を有する後糊方式が多く用いられるようになっている。 Conventionally known, crimp recording paper is formed by printing various information that needs to be concealed or concealed, folding the paper, and crimping the facing surfaces so that they can be peeled off again. Further, as such a crimp recording paper, a pseudo-adhesive layer is laminated in advance on the surface of the coated paper, various information is printed on the surface of the pseudo-adhesive layer, and then the pseudo-adhesive layer is bent so as to face each other. It is possible to re-peel by laminating a pseudo-adhesive layer on the printed surface after printing on the coated paper surface and then bending it so that the pseudo-adhesive layer faces each other. There is a post-glue method that crimps to. In this respect, today, the post-glue method, which has an excellent texture of the adhesive surface after re-peeling and has a high-class feeling, is often used.
ところで、塗工紙に高速かつ大量に印刷を行う方法としては、オフセット印刷が普及している。それゆえ、塗工紙には、オフセット印刷に対応したインク着肉性、表面強度、サイズ性等の多くの性能が要求される。一方、塗工紙に個別情報を印字する方法としては、インクジェット方式が多く用いられている。そのため、オフセット印刷によって共通情報が印刷され、さらにインクジェット印刷によって可変情報が追加されることの多い後糊圧着記録用紙にあっては、オフセット印刷適性とインクジェット印刷適性とを同時に備えることが要求されている。 By the way, offset printing is widely used as a method for printing a large amount of coated paper at high speed. Therefore, coated paper is required to have many performances such as ink inking property, surface strength, and size property corresponding to offset printing. On the other hand, as a method of printing individual information on coated paper, an inkjet method is often used. Therefore, in the case of post-glue crimping recording paper in which common information is printed by offset printing and variable information is often added by inkjet printing, it is required to have both offset printing suitability and inkjet printing suitability at the same time. There is.
しかしながら、後糊圧着記録用紙としては、従来のオフセット印刷用の塗工紙が通常用いられているため、疑似接着剤層を形成する接着剤が塗工層に浸透し易く、十分な圧着安定性が得られないという不都合を有する。一方、従来のオフセット印刷用の塗工紙について、十分な接着力を得るために接着剤を多く塗布すると、剥離面から剥離されず塗工紙が破壊され易くなるおそれがある。 However, since the conventional coated paper for offset printing is usually used as the post-glue crimp recording paper, the adhesive forming the pseudo-adhesive layer easily penetrates into the coated layer, and sufficient crimping stability is obtained. Has the inconvenience of not being able to obtain. On the other hand, if a large amount of adhesive is applied to the conventional coated paper for offset printing in order to obtain sufficient adhesive strength, the coated paper may be easily broken without being peeled from the peeled surface.
このような事情に鑑みて、例えば基紙の一方の面に積層される塗工層を有し、この塗工層が顔料を含み、かつこの塗工層に含まれる顔料１００質量部に対する炭酸カルシウムの含有量が３０質量部以上９０質量部以下である圧着シート用塗工紙（特開２０１１−１９５９９０号公報参照）が発案されている。この圧着シート用塗工紙は、塗工層が上記範囲で炭酸カルシウムを含むことによって、インクジェット印刷におけるインク吸収性を高めつつ、疑似接着剤層を形成する接着剤の浸透を一定程度抑えることで、インクジェット印刷適性及び接着性を一定程度高めることができる。 In view of such circumstances, for example, there is a coating layer laminated on one surface of the base paper, the coating layer contains a pigment, and calcium carbonate with respect to 100 parts by mass of the pigment contained in the coating layer. A coated paper for a pressure-bonding sheet (see JP-A-2011-195990) having a content of 30 parts by mass or more and 90 parts by mass or less has been proposed. This coated paper for a pressure-bonding sheet contains calcium carbonate in the above range to improve ink absorbency in inkjet printing and suppress the penetration of the adhesive forming the pseudo-adhesive layer to a certain extent. , Ink printability and adhesiveness can be improved to some extent.
しかしながら、上記公報所載の圧着シート用塗工紙は、上述のインクジェット印刷適性のため、所定の吸水性を有しているので、疑似接着剤層を形成する接着剤が塗工層に含浸されてしまうことから、例えば接着剤として紫外線硬化型ニスを用いた場合、この接着剤が塗工層内に浸透するのを効果的に抑制することができず、接着剤の使用量が多くなるおそれがある。また、この圧着シート用塗工紙は、このように接着剤の使用量が多くなる結果、再剥離時に剥離面から剥離されず塗工紙が破壊されるおそれがある。 However, since the coated paper for a pressure-bonding sheet published in the above publication has a predetermined water absorption due to the above-mentioned suitability for inkjet printing, the coating layer is impregnated with an adhesive forming a pseudo-adhesive layer. Therefore, for example, when an ultraviolet curable varnish is used as an adhesive, it is not possible to effectively suppress the penetration of this adhesive into the coating layer, and the amount of the adhesive used may increase. There is. Further, as a result of such an increase in the amount of the adhesive used in the coated paper for the pressure-bonding sheet, the coated paper may be destroyed without being peeled from the peeled surface at the time of re-peeling.
本発明は、このような不都合に鑑みてなされたものであり、オフセット印刷適性及びインクジェット印刷適性を有すると共に、接着性を維持しつつ優れた再剥離性を有する後糊圧着記録用原紙の提供を目的とするものである。 The present invention has been made in view of such inconveniences, and provides a base paper for post-glue crimping recording which has offset printability and inkjet printability, and also has excellent removability while maintaining adhesiveness. It is the purpose.
上記課題を解決するためになされた本発明に係る後糊圧着記録用原紙は、基紙及びこの基紙の少なくとも一方の面側に積層される一又は複数の塗工層を備える後糊圧着記録用原紙であって、上記塗工層のうち、最外層の塗工層が顔料及びバインダーを含み、坪量が８０．０ｇ／ｍ２以上１６０．０ｇ／ｍ２以下であり、Ｚ軸方向の剥離強度を上記坪量で除した値が３．８ｋＰａ／ｇ／ｍ２以上であり、トルエン吸油度が１００秒以上であることを特徴とする。 The base paper for post-glue crimping recording according to the present invention, which has been made to solve the above problems, includes a base paper and one or more coating layers laminated on at least one surface side of the base paper. a use base paper, of the coating layer, the outermost layer of the coating layer comprises a pigment and a binder, the basis weight is at 80.0 g / m 2 or more 160.0 g / m 2 or less, in the Z-axis direction The value obtained by dividing the peeling strength by the basis weight is 3.8 kPa / g / m 2 or more, and the toluene oil absorption is 100 seconds or more.
当該後糊圧着記録用原紙は、最外層の塗工層が顔料及びバインダーを含むので、好適なドライピック強度及びウェットピック強度を有し、オフセット印刷適性を有する。また、当該後糊圧着記録用原紙は、最外層の塗工層が顔料及びバインダーを含むので、インクジェットインクやオフセットインクの塗工層への浸透が促進及び定着され、好適なインクジェット印刷適性及びオフセット印刷適性を有する。さらに、当該後糊圧着記録用原紙は、坪量が上記範囲とされ、かつＺ軸方向の剥離強度を上記坪量で除した値が上記範囲とされているので、十分なＺ軸方向に対する層間強度を有する。それゆえ、当該後糊圧着記録用原紙は、上記最外層の塗工層表面に疑似接着剤層が積層された後糊圧着記録用紙において、疑似接着剤層を対向させるように折曲げて接着した上で再剥離する場合の材料破壊が抑制され、剥離面で好適に剥離することができる。また、当該後糊圧着記録用原紙は、トルエン吸油度が上記範囲とされているので、接着剤として例えば紫外線硬化型ニスを用いた場合、この接着剤の浸透が好適に抑制される。それゆえ、当該後糊圧着記録用原紙は、接着剤の使用量を抑え、かつ接着性を維持することが可能であると共に、再剥離時の材料破壊を効果的に抑制することができる。 Since the outermost coating layer of the base paper for post-glue pressure bonding recording contains a pigment and a binder, the base paper for post-glue pressure bonding has suitable dry pick strength and wet pick strength, and has offset printing suitability. Further, since the outermost coating layer of the base paper for post-glue pressure bonding recording contains a pigment and a binder, the penetration of the inkjet ink or the offset ink into the coating layer is promoted and fixed, and suitable inkjet printability and offset are obtained. Has printability. Further, since the base paper for post-glue crimping recording has a basis weight in the above range and a value obtained by dividing the peel strength in the Z-axis direction by the above-mentioned basis weight is in the above range, sufficient layers in the Z-axis direction are formed. Has strength. Therefore, the base paper for post-glue crimping recording is bonded by bending the pseudo-adhesive layer so as to face each other in the post-glue crimping recording paper in which the pseudo-adhesive layer is laminated on the surface of the coating layer of the outermost layer. Material destruction in the case of re-peeling above is suppressed, and the peeling surface can be suitably peeled. Further, since the base paper for post-glue pressure bonding recording has a toluene oil absorption within the above range, when, for example, an ultraviolet curable varnish is used as the adhesive, the penetration of the adhesive is preferably suppressed. Therefore, the post-glue pressure-bonding recording base paper can suppress the amount of adhesive used, maintain adhesiveness, and effectively suppress material destruction during re-peeling.
上記基紙がポリアクリルアミド系紙力増強剤を含み、上記最外層の塗工層が顔料としてカオリンを含むとよい。また、上記最外層の塗工層の全顔料１００質量部に対する上記カオリンの含有量としては３０質量部以上が好ましく、上記最外層の塗工層の塗工量としては７．５ｇ／ｍ２以上１５．０ｇ／ｍ２以下が好ましい。このように、最外層の塗工層が上記範囲でカオリンを含むと共に、最外層の塗工層の塗工量が上記範囲とされることによって、接着剤の塗工層への浸透が効果的に抑えられ、再剥離時の材料破壊をさらに効果的に抑制することができる。加えて、上記基紙がポリアクリルアミド系紙力増強剤を含むことによって、接着剤の基紙への浸透を抑制することができる。また、ポリアクリルアミド系紙力増強剤は接着剤として用いられる紫外線硬化型ニスとの相溶性が高いため、紫外線硬化型ニスが基紙内に浸透した場合でも、この紫外線硬化型ニスによって基紙内が目止めされることで基紙の強度の低下が抑えられ、ひいてはＺ軸方向の剥離強度の低下を防止することができる。 It is preferable that the base paper contains a polyacrylamide-based paper strength enhancer and the outermost coating layer contains kaolin as a pigment. The content of kaolin in 100 parts by mass of the total pigment of the coating layer of the outermost layer is preferably 30 parts by mass or more, and the coating amount of the coating layer of the outermost layer is 7.5 g / m 2 or more. It is preferably 15.0 g / m 2 or less. As described above, the outermost coating layer contains kaolin in the above range, and the coating amount of the outermost coating layer is in the above range, so that the adhesive penetrates into the coating layer effectively. It is possible to more effectively suppress material destruction during re-peeling. In addition, when the base paper contains a polyacrylamide-based paper strength enhancer, it is possible to suppress the penetration of the adhesive into the base paper. In addition, since the polyacrylamide-based paper strength enhancer has high compatibility with the UV-curable varnish used as an adhesive, even if the UV-curable varnish penetrates into the base paper, the UV-curable varnish inside the base paper. By sealing the paper, it is possible to suppress a decrease in the strength of the base paper, and thus prevent a decrease in the peel strength in the Z-axis direction.
上記基紙のステキヒトサイズ度としては、１５秒以上８０秒以下が好ましい。これにより、インクジェットインクの浸透性及び接着剤として水溶性接着剤を用いた場合の浸透性を適度に保つことができる。 The degree of nice human size of the base paper is preferably 15 seconds or more and 80 seconds or less. As a result, the permeability of the inkjet ink and the permeability when a water-soluble adhesive is used as the adhesive can be appropriately maintained.
なお、本発明において、「坪量」とは、ＪＩＳ−Ｐ−８１２４（２０１１）に準拠した値である。また、「Ｚ軸方向の剥離強度」とは、ＩＳＯ １５７５４に準拠した厚み方向の剥離強度を意味する。「トルエン吸油度」とは、ＪＩＳ−Ｐ−８１３０（１９９４）に準拠した値である。「ステキヒトサイズ度」とは、ＪＩＳ−Ｐ−８１２２（２００４）に準拠した値である。 In the present invention, the "basis weight" is a value based on JIS-P-8124 (2011). Further, the "peeling strength in the Z-axis direction" means the peeling strength in the thickness direction in accordance with ISO 15754. The "toluene oil absorption degree" is a value based on JIS-P-8130 (1994). The “Sutekihito size degree” is a value based on JIS-P-8122 (2004).
以上説明したように、本発明の後糊圧着記録用原紙は、オフセット印刷適性及びインクジェット印刷適性を有すると共に、接着性を維持しつつ優れた再剥離性を有する。 As described above, the base paper for post-glue pressure bonding recording of the present invention has offset printing suitability and inkjet printing suitability, and also has excellent removability while maintaining adhesiveness.
以下、本発明の実施の形態を詳説する。 Hereinafter, embodiments of the present invention will be described in detail.
＜後糊圧着記録用原紙＞
本発明の後糊圧着記録用原紙は、基紙及びこの基紙の少なくとも一方の面側に積層される一又は複数の塗工層を備える後糊圧着記録用原紙であって、上記塗工層のうち、最外層の塗工層が顔料及びバインダーを含み、坪量が８０．０ｇ／ｍ２以上１６０．０ｇ／ｍ２以下であり、Ｚ軸方向の剥離強度を上記坪量で除した値が３．８ｋＰａ／ｇ／ｍ２以上であり、トルエン吸油度が１００秒以上であることを特徴とする。
<Base paper for post-glue crimp recording>
The base paper for post-glue crimping recording of the present invention is a base paper and a base paper for post-glue crimping recording including one or a plurality of coating layers laminated on at least one surface side of the base paper, and the coating layer. of the outermost layer of the coating layer comprises a pigment and a binder, the basis weight is at 80.0 g / m 2 or more 160.0 g / m 2 or less, the value of the peel strength in the Z-axis direction by dividing by the basis weight Is 3.8 kPa / g / m 2 or more, and the toluene oil absorption degree is 100 seconds or more.
当該後糊圧着記録用原紙は、最外層の塗工層が顔料及びバインダーを含むので、好適なドライピック強度及びウェットピック強度を有し、オフセット印刷適性を有する。また、当該後糊圧着記録用原紙は、最外層の塗工層が顔料及びバインダーを含むので、インクジェットインクやオフセットインクの塗工層への浸透が促進及び定着され、好適なインクジェット印刷適性及びオフセット印刷適性を有する。さらに、当該後糊圧着記録用原紙は、坪量が上記範囲とされ、かつＺ軸方向の剥離強度を上記坪量で除した値が上記範囲とされているので、十分な層間強度を有する。それゆえ、当該後糊圧着記録用原紙は、上記最外層の塗工層表面に疑似接着剤層が積層された後糊圧着記録用紙において、疑似接着剤層を対向させるように折曲げて接着した上で再剥離する場合の材料破壊が抑制され、剥離面で好適に剥離することができる。また、当該後糊圧着記録用原紙は、トルエン吸油度が上記範囲とされているので、接着剤として例えば紫外線硬化型ニスを用いた場合、この接着剤の浸透が好適に抑制される。それゆえ、当該後糊圧着記録用原紙は、接着剤の使用量を抑え、かつ接着性を維持することが可能であると共に、再剥離時の材料破壊を効果的に抑制することができる。 Since the outermost coating layer of the base paper for post-glue pressure bonding recording contains a pigment and a binder, the base paper for post-glue pressure bonding has suitable dry pick strength and wet pick strength, and has offset printing suitability. Further, since the outermost coating layer of the base paper for post-glue pressure bonding recording contains a pigment and a binder, the penetration of the inkjet ink or the offset ink into the coating layer is promoted and fixed, and suitable inkjet printability and offset are obtained. Has printability. Further, the base paper for post-glue pressure bonding recording has a sufficient interlayer strength because the basis weight is in the above range and the value obtained by dividing the peel strength in the Z-axis direction by the above basis weight is in the above range. Therefore, the base paper for post-glue crimping recording is bonded by bending the pseudo-adhesive layer so as to face each other in the post-glue crimping recording paper in which the pseudo-adhesive layer is laminated on the surface of the coating layer of the outermost layer. Material destruction in the case of re-peeling above is suppressed, and the peeling surface can be suitably peeled. Further, since the base paper for post-glue pressure bonding recording has a toluene oil absorption within the above range, when, for example, an ultraviolet curable varnish is used as the adhesive, the penetration of the adhesive is preferably suppressed. Therefore, the post-glue pressure-bonding recording base paper can suppress the amount of adhesive used, maintain adhesiveness, and effectively suppress material destruction during re-peeling.
（基紙）
基紙は、パルプ繊維を主成分とするパルプスラリーを抄紙して製造される。
(Base paper)
The base paper is produced by making a pulp slurry containing pulp fibers as a main component.
上記パルプ繊維としては、公知のものが挙げられ、バージンパルプ、古紙パルプ又はこれらを組み合わせたものを適宜用いることができる。 Examples of the pulp fiber include known ones, and virgin pulp, used paper pulp, or a combination thereof can be appropriately used.
上記バージンパルプとしては、例えば広葉樹晒クラフトパルプ（ＬＢＫＰ）、針葉樹晒クラフトパルプ（ＮＢＫＰ）、広葉樹未晒クラフトパルプ（ＬＵＫＰ）、針葉樹未晒クラフトパルプ（ＮＵＫＰ）、広葉樹半晒クラフトパルプ（ＬＳＢＫＰ）、針葉樹半晒クラフトパルプ（ＮＳＢＫＰ）、広葉樹亜硫酸パルプ、針葉樹亜硫酸パルプ等の化学パルプ；ストーングランドパルプ（ＳＧＰ）、加圧ストーングランドパルプ（ＴＧＰ）、ケミグランドパルプ（ＣＧＰ）、砕木パルプ（ＧＰ）、サーモメカニカルパルプ（ＴＭＰ）等の機械パルプ（ＭＰ）；ケナフ、麻、葦等の非木材繊維から化学的又は機械的に製造されたパルプ等が挙げられる。 Examples of the virgin pulp include broad-leaved bleached kraft pulp (LBKP), coniferous bleached kraft pulp (NBKP), broad-leaved unbleached kraft pulp (LUKP), coniferous unbleached kraft pulp (NUKP), and broadleaf semi-bleached kraft pulp (LSBKP). Chemical pulps such as conifer semi-bleached kraft pulp (NSBKP), broadleaf sulfite pulp, conifer sulfite pulp; stone ground pulp (SGP), pressurized stone ground pulp (TGP), chemigrand pulp (CGP), crushed wood pulp (GP), Mechanical pulp (MP) such as thermomechanical pulp (TMP); pulp chemically or mechanically produced from non-wood fibers such as kenaf, hemp and reeds.
上記古紙パルプとしては、例えば茶古紙、クラフト封筒古紙、雑誌古紙、新聞古紙、チラシ古紙、オフィス古紙、段ボール古紙、上白古紙、ケント古紙、模造古紙、地券古紙等から製造される離解古紙パルプ、離解・脱墨古紙パルプ（ＤＩＰ）又は離解・脱墨・漂白古紙パルプ等が挙げられる。 Examples of the waste paper pulp include tea waste paper, kraft envelope waste paper, magazine waste paper, newspaper waste paper, leaflet waste paper, office waste paper, corrugated cardboard waste paper, upper white waste paper, Kent waste paper, imitation waste paper, and ground ticket waste paper. , Dissolution / deinking waste paper pulp (DIP) or desorption / deinking / bleached waste paper pulp and the like.
これらの中でも、上記パルプ繊維としては、広葉樹クラフトパルプ（ＬＫＰ）と針葉樹クラフトパルプ（ＮＫＰ）とを組み合わせたものが好ましく、広葉樹晒クラフトパルプ（ＬＢＫＰ）と針葉樹晒クラフトパルプ（ＮＢＫＰ）とを組み合わせたものが特に好ましい。当該後糊圧着記録用原紙は、これら２種のパルプを用いることで基紙の吸水性を的確に調整し、フォーム印刷等に対する優れた印刷適性及び加工適性を具備することができる。 Among these, as the pulp fiber, a combination of hardwood kraft pulp (LKP) and coniferous kraft pulp (NKP) is preferable, and a combination of hardwood bleached kraft pulp (LBKP) and coniferous bleached kraft pulp (NBKP) is combined. Those are particularly preferable. By using these two types of pulp, the base paper for post-glue pressure bonding recording can accurately adjust the water absorption of the base paper, and can have excellent printability and processability for foam printing and the like.
上記パルプ繊維として広葉樹クラフトパルプ（ＬＫＰ）及び針葉樹クラフトパルプ（ＮＫＰ）を併用する場合における全パルプ成分１００質量部に対する広葉樹クラフトパルプ（ＬＫＰ）の含有量の下限としては、６５質量部が好ましく、７０質量部がより好ましく、７５質量部がさらに好ましい。一方、全パルプ成分１００質量部に対する広葉樹クラフトパルプ（ＬＫＰ）の含有量の上限としては、９８質量部が好ましく、９６質量部がより好ましく、９５質量部がさらに好ましい。また、上記パルプ繊維として広葉樹クラフトパルプ（ＬＫＰ）及び針葉樹クラフトパルプ（ＮＫＰ）を併用する場合における全パルプ成分１００質量部に対する針葉樹クラフトパルプ（ＮＫＰ）の含有量の下限としては、２質量部が好ましく、４質量部がより好ましく、５質量部がさらに好ましい。一方、全パルプ成分１００質量部に対する針葉樹クラフトパルプ（ＮＫＰ）の含有量の上限としては、３５質量部が好ましく、３０質量部がより好ましく、２５質量部がさらに好ましい。広葉樹クラフトパルプ（ＬＫＰ）は、繊維長が短いため、得られる基紙の繊維間の空隙を比較的少なくすることができる。これに対し、針葉樹クラフトパルプ（ＮＫＰ）は、繊維長が長いため、得られる基紙の繊維間の結合を強化することができる。それゆえ、当該後糊圧着記録用原紙は、上記基紙が広葉樹クラフトパルプ（ＬＫＰ）及び針葉樹クラフトパルプ（ＮＫＰ）を上記割合で含有することによって、基紙の強度を向上しつつ、基紙に適度な吸水性を持たせてインク転移性を高めると共に、塗工層を形成するバインダーを基紙の繊維間に入り込ませ、このバインダーと繊維とを密に接着することができる。従って、当該後糊圧着記録用原紙は、塗工層のアンカー効果が高くなり、塗工層の表面に疑似接着剤層が積層された後糊圧着記録用紙において、疑似接着剤層を対向させるように折曲げて接着した上で再剥離する場合の塗工層の割れを好適に防止することができる。 When broad-leaved kraft pulp (LKP) and softwood kraft pulp (NKP) are used in combination as the pulp fiber, the lower limit of the content of broad-leaved kraft pulp (LKP) with respect to 100 parts by mass of the total pulp component is preferably 65 parts by mass, and is 70. By mass is more preferred, and 75 parts by mass is even more preferred. On the other hand, as the upper limit of the content of hardwood kraft pulp (LKP) with respect to 100 parts by mass of the total pulp component, 98 parts by mass is preferable, 96 parts by mass is more preferable, and 95 parts by mass is further preferable. Further, when the broad-leaved kraft pulp (LKP) and the softwood kraft pulp (NKP) are used in combination as the pulp fiber, the lower limit of the content of the softwood kraft pulp (NKP) with respect to 100 parts by mass of the total pulp component is preferably 2 parts by mass. 4, 4 parts by mass is more preferable, and 5 parts by mass is further preferable. On the other hand, the upper limit of the content of softwood kraft pulp (NKP) with respect to 100 parts by mass of the total pulp component is preferably 35 parts by mass, more preferably 30 parts by mass, and even more preferably 25 parts by mass. Since hardwood kraft pulp (LKP) has a short fiber length, the voids between the fibers of the obtained base paper can be relatively reduced. On the other hand, softwood kraft pulp (NKP) has a long fiber length, so that the bond between the fibers of the obtained base paper can be strengthened. Therefore, the base paper for post-glue crimping recording is made into a base paper while improving the strength of the base paper by containing the broadleaf kraft pulp (LKP) and the coniferous kraft pulp (NKP) in the above ratios. The ink transfer property is enhanced by providing appropriate water absorption, and the binder forming the coating layer is allowed to enter between the fibers of the base paper, and the binder and the fibers can be closely adhered to each other. Therefore, the base paper for post-glue crimping recording has a high anchoring effect of the coating layer, and the pseudo-adhesive layer is opposed to each other in the post-glue crimping recording paper in which the pseudo-adhesive layer is laminated on the surface of the coating layer. It is possible to suitably prevent cracking of the coating layer when the coating layer is bent and adhered to the surface and then peeled off again.
上記広葉樹クラフトパルプ（ＬＫＰ）のフリーネスの下限としては、３６０ｍｌが好ましく、４００ｍｌがより好ましく、４２０ｍｌがさらに好ましい。また、上記広葉樹クラフトパルプ（ＬＫＰ）のフリーネスの上限としては、４９５ｍｌが好ましく、４９０ｍｌがより好ましく、４８０ｍｌがさらに好ましい。一方、上記針葉樹クラフトパルプ（ＮＫＰ）のフリーネスの下限としては、５００ｍｌが好ましく、５０５ｍｌがより好ましく、５１０ｍｌがさらに好ましい。また、上記針葉樹クラフトパルプ（ＮＫＰ）のフリーネスの上限としては、６１０ｍｌが好ましく、６００ｍｌがより好ましく、５９０ｍｌがさらに好ましい。上記広葉樹クラフトパルプ（ＬＫＰ）及び針葉樹クラフトパルプ（ＮＫＰ）のフリーネスが上記範囲であることによって、基紙のＺ軸方向の層間強度及び吸水性や接着剤の浸透性を好適に調整しつつ、基紙の引張強度や引裂強度等を高めることができる。なお、「フリーネス」とは、ＪＩＳ−Ｐ−８１２１（２０１２）に準拠して測定される値である。 As the lower limit of the freeness of the hardwood kraft pulp (LKP), 360 ml is preferable, 400 ml is more preferable, and 420 ml is further preferable. The upper limit of the freeness of the hardwood kraft pulp (LKP) is preferably 495 ml, more preferably 490 ml, and even more preferably 480 ml. On the other hand, as the lower limit of the freeness of the softwood kraft pulp (NKP), 500 ml is preferable, 505 ml is more preferable, and 510 ml is further preferable. The upper limit of the freeness of the softwood kraft pulp (NKP) is preferably 610 ml, more preferably 600 ml, and even more preferably 590 ml. When the freeness of the hardwood kraft pulp (LKP) and the coniferous kraft pulp (NKP) is within the above range, the interlayer strength in the Z-axis direction of the base paper, the water absorption, and the permeability of the adhesive are appropriately adjusted. It is possible to increase the tensile strength and tear strength of paper. The "freeness" is a value measured in accordance with JIS-P-8121 (2012).
また、上記基紙中には必要に応じて填料を配合することができる。上記基紙中に填料を配合することによって、基紙の不透明度を向上させ、隠蔽性を高めることができる。上記基紙中に配合される填料としては、公知のものを用いることができ、例えばタルク、炭酸カルシウム、カオリン、二酸化チタン、水和ケイ素、水和ケイ酸（ホワイトカーボン）、尿素−ホルマリンポリマー微粒子、再生粒子、シリカ複合再生粒子、シリカ複合無機粒子等が挙げられる。 In addition, a filler can be added to the base paper as needed. By blending a filler in the base paper, the opacity of the base paper can be improved and the hiding property can be improved. Known fillers can be used as the filler to be blended in the base paper, for example, talc, calcium carbonate, kaolin, titanium dioxide, silicon hydrate, silicic acid hydrate (white carbon), urea-formalin polymer fine particles. , Regenerated particles, silica composite regenerated particles, silica composite inorganic particles and the like.
これらの中でも、上記填料としては、疑似接着させる際の圧力緩衝性及び基紙の白色度向上性を好適に向上することのできる炭酸カルシウムが好ましい。 Among these, as the filler, calcium carbonate, which can suitably improve the pressure buffering property at the time of pseudo-adhesion and the whiteness improving property of the base paper, is preferable.
上記填料の灰分に対する含有量の下限としては、４質量％が好ましく、５質量％がより好ましく、６質量％がさらに好ましい。一方、上記填料の灰分に対する含有量の上限としては、１５質量％が好ましく、１４質量％がより好ましく、１２質量％がさらに好ましい。上記填料の灰分に対する含有量が上記下限未満の場合、基紙の不透明度を好適に高めることができないおそれがある。逆に、上記填料の灰分に対する含有量が上記上限を超える場合、基紙の引張強度や引裂強度が低下するおそれがある。なお、「灰分」とは、ＪＩＳ−Ｐ−８２５１（２００３）「紙、板紙及びパルプ−灰分試験方法−５２５℃燃焼法」に準拠した測定値である。 As the lower limit of the content of the filler with respect to the ash content, 4% by mass is preferable, 5% by mass is more preferable, and 6% by mass is further preferable. On the other hand, as the upper limit of the content of the filler with respect to the ash content, 15% by mass is preferable, 14% by mass is more preferable, and 12% by mass is further preferable. If the content of the filler with respect to the ash content is less than the above lower limit, the opacity of the base paper may not be suitably increased. On the contrary, when the content of the filler with respect to the ash exceeds the above upper limit, the tensile strength and tear strength of the base paper may decrease. The "ash content" is a measured value based on JIS-P-8251 (2003) "Paper, paperboard and pulp-ash content test method-525 ° C. combustion method".
また、上記基紙中には、紙力増強剤を含有するのが好ましい。上記基紙中に含有される紙力増強剤としては、例えばポリビニルアルコール系高分子、ポリアクリルアミド系高分子、カチオン化澱粉、尿素／ホルマリン樹脂、メラミン／ホルマリン樹脂等が挙げられる。これらの中でも、ポリアクリルアミド系の乾燥紙力増強剤が内添されるのが好ましい。当該後糊圧着記録用原紙は、上記基材層中にポリアクリルアミド系の乾燥紙力増強剤が内添されることによって、Ｚ軸方向の剥離強度を好適に高めることができる。またポリアクリルアミド系の接着剤を用いた場合、基紙中のポリアクリルアミドと接着剤との相溶性があるため、接着剤の目拠め作用が働く。 Further, it is preferable that the base paper contains a paper strength enhancer. Examples of the paper strength enhancer contained in the base paper include polyvinyl alcohol-based polymers, polyacrylamide-based polymers, cationized starch, urea / formalin resin, melamine / formalin resin, and the like. Among these, it is preferable to add a polyacrylamide-based dry paper strength enhancer internally. The post-glue pressure-bonding recording base paper can suitably increase the peel strength in the Z-axis direction by internally adding a polyacrylamide-based dry paper strength enhancer in the base material layer. Further, when a polyacrylamide-based adhesive is used, the polyacrylamide in the base paper and the adhesive are compatible with each other, so that the adhesive acts as a target.
さらに、上記基紙中には、染料定着剤としてカチオン性樹脂を含有してもよい。このカチオン性樹脂としては、カチオン性の水溶性高分子であり、アニオン要求量が５ｍｅｑ／ｇ以上、分子量が５，０００以上２００，０００以下のものが好適に用いられる。このようなカチオン性樹脂としては、例えばポリエチレンイミン４級アンモニウム塩誘導体；ポリアミンポリアミドエピハロヒドリン縮重合体；アンモニア、モノアミンやポリアミン等のアミン類、及びエピハロヒドリン類を反応させてなる縮重合物（ジアルキルアミン・アンモニア・エピクロロヒドリン縮重合体等）；ジシアンジアミド・ホルムアルデヒド樹脂；ジエチレントリアミン・ジシアンジアミド・アンモニウムクロライド重合物；ジメチルジアリルアンモニウムクロライド重合物等が挙げられる。これらの中でも、アンモニア、モノアミンやポリアミン等のアミン類、及びエピハロヒドリン類とを反応させてなる縮重合物（ジアルキルアミン・アンモニア・エピクロロヒドリン縮重合体等）が特に好ましい。当該後糊圧着記録用原紙は、このようなカチオン性樹脂を含有することによって、インクジェット印刷の際の印字部の耐水性を向上させ水漏れを防止することができる。 Further, the base paper may contain a cationic resin as a dye fixing agent. As the cationic resin, a cationic water-soluble polymer having an anion requirement of 5 meq / g or more and a molecular weight of 5,000 or more and 200,000 or less is preferably used. Examples of such a cationic resin include polyethyleneimine quaternary ammonium salt derivatives; polyamine polyamide epihalohydrin reduced polymers; amines such as ammonia, monoamines and polyamines, and reduced polymers obtained by reacting epihalohydrins (dialkylamines). Ammonia / epichlorohydrin-condensed polymer, etc.); dicyandiamide / formaldehyde resin; diethylenetriamine / dicyandiamide / ammonium chloride polymer; dimethyldialylammonium chloride polymer, etc. Among these, a condensed polymer obtained by reacting ammonia, amines such as monoamine and polyamine, and epihalohydrin (dialkylamine, ammonia, epichlorohydrin condensed polymer, etc.) is particularly preferable. By containing such a cationic resin in the base paper for post-glue pressure bonding recording, it is possible to improve the water resistance of the printed portion at the time of inkjet printing and prevent water leakage.
なお、上記基紙は、本発明の効果を損なわない範囲において、助剤として、酸化澱粉、エステル化澱粉等の澱粉類、カルボキシメチルセルロース、ヒドロキシエチルセルロース等のセルロース誘導体、ポリビニルピロリドン、カゼイン、ゼラチン、大豆タンパク、スチレン−アクリル樹脂又はその誘導体、スチレン−ブタジエン樹脂ラテックス、アクリル樹脂エマルジョン、酢酸ビニル樹脂エマルジョン、塩化ビニル樹脂エマルジョン、ウレタン樹脂エマルジョン、尿素樹脂エマルジョン、アルキッド樹脂エマルジョン又はその誘導体、カルバミン酸エステル化澱粉、カチオン化澱粉等を含んでもよい。 As long as the effect of the present invention is not impaired, the above base paper can be used as an auxiliary agent for starches such as oxidized starch and esterified starch, cellulose derivatives such as carboxymethyl cellulose and hydroxyethyl cellulose, polyvinylpyrrolidone, casein, gelatin and soybean. Protein, styrene-acrylic resin or its derivative, styrene-butadiene resin latex, acrylic resin emulsion, vinyl acetate resin emulsion, vinyl chloride resin emulsion, urethane resin emulsion, urea resin emulsion, alkyd resin emulsion or its derivative, carbamic acid esterified starch , Catified starch and the like may be contained.
上記基紙の縦方向の引張強度の下限としては、５．０ｋＮ／ｍが好ましく、６．３ｋＮ／ｍがより好ましく、６．５ｋＮ／ｍがさらに好ましい。一方、上記基紙の縦方向の引張強度の上限としては、９．８ｋＮ／ｍが好ましく、９．５ｋＮ／ｍがより好ましく、９．３ｋＮ／ｍがさらに好ましい。また、上記基紙の横方向の引張強度の下限としては、２．０ｋＮ／ｍが好ましく、３．５ｋＮ／ｍがより好ましく、３．８ｋＮ／ｍがさらに好ましい。一方、上記基紙の横方向の引張強度の上限としては、５．０ｋＮ／ｍが好ましく、４．８ｋＮ／ｍがより好ましく、４．５ｋＮ／ｍがさらに好ましい。上記基紙の縦方向及び横方向の引張強度が上記下限未満の場合、基紙が破紙されやすくなり、加工性や取扱性が低下するおそれがある。逆に、上記基紙の縦方向及び横方向の引張強度が上記上限を超える場合、密度が高くなり、吸水性や接着剤の浸透性が十分に得られないおそれがある。なお、「引張強度」とは、ＪＩＳ−Ｐ−８１１３（２００６）に準拠した値である。 The lower limit of the tensile strength in the vertical direction of the base paper is preferably 5.0 kN / m, more preferably 6.3 kN / m, and even more preferably 6.5 kN / m. On the other hand, the upper limit of the tensile strength of the base paper in the vertical direction is preferably 9.8 kN / m, more preferably 9.5 kN / m, and even more preferably 9.3 kN / m. Further, as the lower limit of the tensile strength in the lateral direction of the base paper, 2.0 kN / m is preferable, 3.5 kN / m is more preferable, and 3.8 kN / m is further preferable. On the other hand, the upper limit of the tensile strength in the lateral direction of the base paper is preferably 5.0 kN / m, more preferably 4.8 kN / m, and even more preferably 4.5 kN / m. If the tensile strength in the vertical direction and the horizontal direction of the base paper is less than the above lower limit, the base paper is likely to be broken, and workability and handleability may be deteriorated. On the contrary, when the tensile strength in the vertical direction and the horizontal direction of the base paper exceeds the upper limit, the density becomes high, and water absorption and the permeability of the adhesive may not be sufficiently obtained. The "tensile strength" is a value based on JIS-P-8113 (2006).
上記基紙の白色度の下限としては、８０％が好ましく、８２％がより好ましい。一方、上記基紙の白色度の上限としては８８％が好ましく、８６％がより好ましい。上記基紙の白色度が上記下限未満の場合、見栄えや印刷された文字等の視認性が低下するおそれがある。逆に、上記基紙の白色度が上記上限を超える場合、コスト高となるおそれがある。なお、「白色度」とは、ＪＩＳ−Ｐ−８１４８（２００１）「紙、板紙及びパルプ−ＩＳＯ白色度（拡散青色光反射率）の測定方法」に準拠して測定した値である。 The lower limit of the whiteness of the base paper is preferably 80%, more preferably 82%. On the other hand, the upper limit of the whiteness of the base paper is preferably 88%, more preferably 86%. If the whiteness of the base paper is less than the above lower limit, the appearance and visibility of printed characters and the like may deteriorate. On the contrary, if the whiteness of the base paper exceeds the upper limit, the cost may increase. The "whiteness" is a value measured in accordance with JIS-P-8148 (2001) "Measuring method of paper, paperboard and pulp-ISO whiteness (diffuse blue light reflectance)".
また、上記基紙の不透明度の下限としては、８５％が好ましく、８７％がより好ましく、８９％がさらに好ましい。上記基紙の不透明度が上記下限未満の場合、裏抜けが生じやすくなるおそれがある。なお、「不透明度」とは、ＪＩＳ−Ｐ−８１４９（２０００）「紙及び板紙−不透明度試験方法（紙の裏当て）−拡散照明法」に準拠した値である。 The lower limit of the opacity of the base paper is preferably 85%, more preferably 87%, and even more preferably 89%. If the opacity of the base paper is less than the above lower limit, strike-through may easily occur. The "opacity" is a value based on JIS-P-8149 (2000) "paper and paperboard-opacity test method (paper backing) -diffusion illumination method".
上記基紙のステキヒトサイズ度の下限としては、１５秒が好ましく、１８秒がより好ましく、２０秒がさらに好ましい。一方、上記基紙のステキヒトサイズ度の上限としては、８０秒が好ましく、７０秒がより好ましく、６０秒がさらに好ましい。上記基紙のステキヒトサイズ度が上記下限未満の場合、例えば疑似接着剤層を形成する接着剤として水溶性接着剤を用いた場合に接着剤の浸透性が大きくなり、疑似接着剤層の接着力が低下するおそれがある。逆に、上記基紙のステキヒトサイズ度が上記上限を超える場合、インクの吸収性が悪化してインクの滲みが生じやすくなるおそれや、水溶性接着剤の浸透が不十分となるおそれがある。 As the lower limit of the degree of stekihito size of the base paper, 15 seconds is preferable, 18 seconds is more preferable, and 20 seconds is even more preferable. On the other hand, as the upper limit of the degree of stekihito size of the base paper, 80 seconds is preferable, 70 seconds is more preferable, and 60 seconds is further preferable. When the degree of nice human size of the base paper is less than the above lower limit, for example, when a water-soluble adhesive is used as the adhesive for forming the pseudo-adhesive layer, the permeability of the adhesive becomes large and the pseudo-adhesive layer is adhered. The force may decrease. On the contrary, when the degree of nice human size of the base paper exceeds the above upper limit, the absorbability of the ink may deteriorate and the ink may easily bleed, or the penetration of the water-soluble adhesive may be insufficient. ..
（アンダー塗工層）
当該後糊圧着記録用原紙は、上記基紙の塗工層を積層する側の面に、予めアンダー塗工層を設けておくことが好ましい。当該後糊圧着記録用原紙は、このようなアンダー塗工層を設けることによって、塗工層を積層した際の塗工層表面の平坦性、印刷情報の高精細化、フルカラー印刷の品質向上等を促進することができると共に、塗工層又はこの塗工層の表面に積層される疑似接着剤層に用いられる塗工液が基紙中へ含浸するのを抑制し、塗工液使用量を抑えることができる。
(Under coating layer)
It is preferable that the base paper for post-glue pressure bonding recording is provided with an undercoating layer in advance on the surface on the side where the coating layer of the base paper is laminated. By providing such an undercoating layer on the base paper for post-adhesive pressure bonding recording, the flatness of the coating layer surface when the coating layers are laminated, the high definition of printing information, the quality improvement of full-color printing, etc. The amount of the coating liquid used can be reduced by suppressing the impregnation of the coating liquid used for the coating layer or the pseudo-adhesive layer laminated on the surface of the coating layer into the base paper. It can be suppressed.
上記アンダー塗工層は、顔料をバインダー中に分散させた塗工液をフィルム転写方式によって塗工することで設けることができる。上記アンダー塗工層に含有される顔料としては、例えばカオリン、タルク、炭酸カルシウム等が挙げられる。これらの中でも、炭酸カルシウムが好ましく、重質炭酸カルシウムが特に好ましい。当該後糊圧着記録用原紙は、上記アンダー塗工層中に含有される顔料として重質炭酸カルシウムを用いることによって、上記基紙及び塗工層の層間強度を好適に向上することができる。また、上記アンダー塗工層に含有されるバインダーとしては、例えば澱粉、ラテックス等が挙げられる。これらの中でも、安価かつ基紙に対するアンカー効果が得られる澱粉が好ましく、澱粉とＳＢＲラテックスとの併用が特に好ましい。 The undercoating layer can be provided by applying a coating liquid in which a pigment is dispersed in a binder by a film transfer method. Examples of the pigment contained in the undercoat layer include kaolin, talc, calcium carbonate and the like. Among these, calcium carbonate is preferable, and heavy calcium carbonate is particularly preferable. By using heavy calcium carbonate as the pigment contained in the undercoating layer of the base paper for post-glue pressure bonding recording, the interlayer strength between the base paper and the coating layer can be suitably improved. Examples of the binder contained in the undercoat layer include starch and latex. Among these, starch which is inexpensive and has an anchor effect on the base paper is preferable, and the combined use of starch and SBR latex is particularly preferable.
上記顔料１００質量部に対する上記澱粉及びＳＢＲラテックスの合計含有量（固形分換算）の下限としては、２質量部が好ましく、４質量部がより好ましく、１０質量部がさらに好ましい。一方、上記顔料１００質量部に対する上記澱粉及びＳＢＲラテックスの合計含有量（固形分換算）の上限としては、２５質量部が好ましく、１８質量部がより好ましく、１５質量部がさらに好ましい。また、上記澱粉及びＳＢＲラテックスの質量基準の配合比としては８：７以上８：５以下が好ましい。当該後糊圧着記録用原紙は、澱粉及びＳＢＲラテックスを上記割合で含有することによって、基紙及び塗工層に対するアンカー効果を向上することができる共に、塗工層や疑似接着層の品質を好適に高めることができる。 As the lower limit of the total content (in terms of solid content) of the starch and SBR latex with respect to 100 parts by mass of the pigment, 2 parts by mass is preferable, 4 parts by mass is more preferable, and 10 parts by mass is further preferable. On the other hand, as the upper limit of the total content (in terms of solid content) of the starch and SBR latex with respect to 100 parts by mass of the pigment, 25 parts by mass is preferable, 18 parts by mass is more preferable, and 15 parts by mass is further preferable. The mass-based mixing ratio of the starch and SBR latex is preferably 8: 7 or more and 8: 5 or less. By containing starch and SBR latex in the above proportions, the base paper for post-glue pressure bonding recording can improve the anchoring effect on the base paper and the coating layer, and the quality of the coating layer and the pseudo-adhesive layer is preferable. Can be enhanced to.
上記アンダー塗工層の塗工量（固形分換算）の下限としては、４．０ｇ／ｍ２が好ましく、４．５ｇ／ｍ２がより好ましく、５．０ｇ／ｍ２がさらに好ましい。一方、上記アンダー塗工層の塗工量（固形分換算）の上限としては、７．５ｇ／ｍ２が好ましく、７．０ｇ／ｍ２がより好ましく、６．０ｇ／ｍ２がさらに好ましい。上記アンダー塗工層の塗工量が上記下限未満の場合、基紙表面の凹凸を十分に埋めることができず、塗工層の表面に疑似接着剤層を積層した場合の光沢度が低下するおそれがある。逆に、上記アンダー塗工層の塗工量が上記上限を超える場合、生産性が低下するおそれがある。 The lower limit of the application amount of the under-coating layer (solid content) is preferably 4.0 g / m 2, more preferably 4.5g / m 2, 5.0g / m 2 is more preferred. In contrast, the upper limit of the application amount of the under-coating layer (solid content) is preferably 7.5 g / m 2, more preferably 7.0g / m 2, 6.0g / m 2 is more preferred. When the coating amount of the undercoating layer is less than the above lower limit, the unevenness on the surface of the base paper cannot be sufficiently filled, and the glossiness when the pseudo-adhesive layer is laminated on the surface of the coating layer is lowered. There is a risk. On the contrary, when the coating amount of the undercoating layer exceeds the upper limit, the productivity may decrease.
なお、上記基紙の両面側に塗工層が積層される場合、上記アンダー塗工層についても上記基紙の両面側に積層されることが好ましい。また、上記アンダー塗工層が上記基紙の両面側に積層される場合、各々のアンダー塗工層の成分、塗工量等の構成を上記構成とすることができる。 When the coating layer is laminated on both sides of the base paper, it is preferable that the undercoating layer is also laminated on both sides of the base paper. Further, when the undercoating layer is laminated on both side surfaces of the base paper, the composition of each undercoating layer, the coating amount, and the like can be configured as described above.
（塗工層）
塗工層は、上記基紙の少なくとも一方の面側に塗工液の塗工によって積層される。当該後糊圧着記録用原紙は、一つの塗工層を有してもよく、複数の塗工層を有してもよい。また、上記塗工層のうち、最外層の塗工層は顔料及びバインダーを含んでいる。
(Coating layer)
The coating layer is laminated on at least one surface side of the base paper by coating with a coating liquid. The base paper for post-glue pressure bonding recording may have one coating layer or may have a plurality of coating layers. Further, among the above-mentioned coating layers, the outermost coating layer contains a pigment and a binder.
上記バインダーとしては、特に限定されず、例えばカチオン化澱粉、エーテル化澱粉、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、カルバミン酸エステル化澱粉等の澱粉誘導体；カルボキシメチルセルロース、ヒドロキシエチルセルロース等のセルロース誘導体；カゼイン、ゼラチン、大豆蛋白、ポリビニルアルコール又はその誘導体；ポリビニルピロリドン、無水マレイン酸樹脂、スチレン−ブタジエン共重合体、メチルメタクリレート−ブタジエン共重合体等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及びメタクリル酸エステルの重合体又は共重合体等のアクリル系重合体ラテックス；エチレン−酢酸ビニル共重合体等のビニル系重合体ラテックス；これら各種重合体にカチオン性基を用いてカチオン化したラテックス、カチオン性界面活性剤によって重合体表面をカチオン化したラテックス、カチオン性ポリビニルアルコール下で重合し、重合体表面にこのカチオン性ビニルアルコールを分布させたラテックス、カチオン性コロイド粒子の懸濁分散液中で重合を行い、重合体表面にこのカチオン性コロイド粒子を分布させたラテックス；メラミン樹脂、尿素樹脂等の熱硬化合成樹脂等の水性接着剤；ポリメチルメタクリレート等のアクリル酸エステルやメタクリル酸エステルの重合体又は共重合体；ポリウレタン系樹脂、不飽和ポリエステル系樹脂、塩化ビニル−酢酸ビニル共重合体、ポリビニルブチラール、アルキッド樹脂等の合成樹脂系接着剤等が挙げられ、これらを単独で又は２種以上を組み合わせて用いることができる。これらの中でも、費用対効果の点から、汎用性の高いスチレン−ブタジエン共重合体ラテックス又は澱粉誘導体が好適に用いられる。また、当該後糊圧着記録用原紙を用いて得られる後糊圧着記録用紙が主として郵送用途に用いられることから、黄変化しやすいアクリロニトリルの含有量は少ない方が好ましい。さらに、上記スチレン−ブタジエン共重合体のガラス転移温度としては、優れた柔軟性を有することができるよう低い方が好ましく、例えば０℃未満とすることができる。 The binder is not particularly limited, and is, for example, a starch derivative such as cationized starch, etherified starch, phosphoric acid esterified starch, hydroxyethyl etherified starch, carbamate esterified starch; and cellulose derivative such as carboxymethyl cellulose and hydroxyethyl cellulose. Casein, gelatin, soybean protein, polyvinyl alcohol or a derivative thereof; conjugated diene copolymer latex such as polyvinylpyrrolidone, maleic anhydride resin, styrene-butadiene copolymer, methyl methacrylate-butadiene copolymer; acrylic acid ester and Acrylic polymer latex such as methacrylic acid ester polymer or copolymer; Vinyl polymer latex such as ethylene-vinyl acetate copolymer; Latex and cation cationized by using cationic groups to these various polymers. A latex in which the surface of the polymer is cationized with a sex surfactant, a latex polymerized under cationic polyvinyl alcohol, and the cationic vinyl alcohol distributed on the surface of the polymer, polymerized in a suspension dispersion of cationic colloid particles A latex in which the cationic colloidal particles are distributed on the surface of the polymer; an aqueous adhesive such as a heat-curable synthetic resin such as a melamine resin or a urea resin; a polymer of an acrylic acid ester such as polymethylmethacrylate or a methacrylic acid ester. Alternatively, a copolymer; a polyurethane resin, an unsaturated polyester resin, a vinyl chloride-vinyl acetate copolymer, a polyvinyl butyral, a synthetic resin adhesive such as an alkyd resin, etc. may be mentioned, and these may be used alone or in combination of two or more. Can be used in combination. Among these, a highly versatile styrene-butadiene copolymer latex or starch derivative is preferably used from the viewpoint of cost effectiveness. Further, since the post-glue crimping recording paper obtained by using the post-glue crimping recording base paper is mainly used for mailing, it is preferable that the content of acrylonitrile that easily turns yellow is small. Further, the glass transition temperature of the styrene-butadiene copolymer is preferably as low as possible so as to have excellent flexibility, and can be, for example, less than 0 ° C.
上記顔料としては、特に限定されず、例えば軽質炭酸カルシウム、重質炭酸カルシウム、炭酸マグネシウム、カオリン、デラミネーティッドカオリン、焼成カオリン、タルク、硫酸カルシウム、硫酸バリウム、二酸化チタン、酸化亜鉛、硫化亜鉛、炭酸亜鉛、サチンホワイト、珪酸アルミニウム、ケイソウ土、珪酸カルシウム、合成非晶質シリカ、コロイダルシリカ、カリオン修飾したコロイダルシリカ、水酸化アルミニウム、アルミナ、アルミナ水和物、リトポン、ゼオライト、加水ハロサイト、水酸化マグネシウム等の白色無機顔料；スチレン又はその共重合体のプラスチックピグメント、ポリエチレン、マイクロカプセル、尿素樹脂、メラミン樹脂等の有機顔料等が挙げられ、これらを単独で又は２種以上を組み合わせて用いることができる。これらの中でも、比較的安価で、かつブレードコーターやフィルムトランスファーロール等での高速塗工適性に優れると共に、優れた後糊適性が得られるカオリン又は炭酸カルシウムが好ましく、カオリン及び炭酸カルシウムの併用がより好ましい。また、上記炭酸カルシウムとしては、形状が不定型な重質炭酸カルシウムが特に好ましい。 The pigment is not particularly limited, and for example, light calcium carbonate, heavy calcium carbonate, magnesium carbonate, kaolin, delaminated kaolin, calcined kaolin, talc, calcium sulfate, barium sulfate, titanium dioxide, zinc oxide, zinc sulfide, etc. Zinc oxide, satin white, aluminum silicate, silica soil, calcium silicate, synthetic amorphous silica, colloidal silica, carion-modified colloidal silica, aluminum hydroxide, alumina, alumina hydrate, lithopone, zeolite, hydrous halosite, water White inorganic pigments such as magnesium oxide; plastic pigments of styrene or its copolymers, organic pigments such as polyethylene, microcapsules, urea resin, melamine resin, etc., and these may be used alone or in combination of two or more. Can be done. Among these, kaolin or calcium carbonate, which is relatively inexpensive and has excellent high-speed coating suitability with a blade coater, film transfer roll, etc., and also has excellent post-glue suitability, is preferable, and kaolin and calcium carbonate are more used in combination. preferable. Further, as the calcium carbonate, heavy calcium carbonate having an irregular shape is particularly preferable.
最外層の塗工層における全顔料１００質量部に対する上記カオリンの含有量の下限としては、３０質量部が好ましく、３５質量部がより好ましく、４０質量部がさらに好ましい。一方、最外層の塗工層における全顔料１００質量部に対する上記カオリンの含有量の上限としては、８０質量部が好ましく、７０質量部がより好ましく、５０質量部がさらに好ましい。最外層の塗工層における全顔料１００質量部に対する上記カオリンの含有量が上記下限未満の場合、疑似接着剤層を形成する接着剤の浸透を十分に抑えられないおそれがある。逆に、最外層の塗工層における全顔料１００質量部に対する上記カオリンの含有量が上記上限を超える場合、インクジェットインクの吸収性が悪化するおそれがある。 The lower limit of the content of kaolin with respect to 100 parts by mass of the total pigment in the coating layer of the outermost layer is preferably 30 parts by mass, more preferably 35 parts by mass, and even more preferably 40 parts by mass. On the other hand, as the upper limit of the content of the kaolin in 100 parts by mass of the total pigment in the outermost coating layer, 80 parts by mass is preferable, 70 parts by mass is more preferable, and 50 parts by mass is further preferable. If the content of the kaolin in 100 parts by mass of the total pigment in the outermost coating layer is less than the above lower limit, the penetration of the adhesive forming the pseudo-adhesive layer may not be sufficiently suppressed. On the contrary, when the content of the kaolin in 100 parts by mass of the total pigment in the outermost coating layer exceeds the upper limit, the absorbability of the inkjet ink may deteriorate.
また、上記顔料としてカオリン及び炭酸カルシウムが併用される場合におけるカオリン及び炭酸カルシウムの質量基準の配合比の下限としては、３：７が好ましく、７：１３がより好ましい。一方、上記顔料としてカオリン及び炭酸カルシウムが併用される場合におけるカオリン及び炭酸カルシウムの質量基準の配合比の上限としては、４：１が好ましく、７：３がより好ましい。カオリン及び炭酸カルシウムの配合比が上記下限未満の場合、疑似接着剤層を形成する接着剤の最外層の塗工層への浸透を十分に抑制することができないおそれがある。逆に、カオリン及び炭酸カルシウムの配合比が上記上限を超える場合、インクジェットインクの吸収性が悪化するおそれがある。 Further, as the lower limit of the mass-based compounding ratio of kaolin and calcium carbonate when kaolin and calcium carbonate are used in combination as the pigment, 3: 7 is preferable, and 7:13 is more preferable. On the other hand, when kaolin and calcium carbonate are used in combination as the pigment, the upper limit of the mass-based compounding ratio of kaolin and calcium carbonate is preferably 4: 1 and more preferably 7: 3. If the blending ratio of kaolin and calcium carbonate is less than the above lower limit, it may not be possible to sufficiently suppress the penetration of the adhesive forming the pseudo-adhesive layer into the coating layer of the outermost layer. On the contrary, when the compounding ratio of kaolin and calcium carbonate exceeds the above upper limit, the absorbability of the inkjet ink may deteriorate.
上記顔料１００質量部に対する上記バインダーの含有量（固形分換算）の下限としては、５質量部が好ましく、７質量部がより好ましく、９質量部がさらに好ましい。一方、上記顔料１００質量部に対する上記バインダーの含有量（固形分換算）の上限としては、２５質量部が好ましく、２３質量部がより好ましく、２１質量部がさらに好ましい。上記顔料１００質量部に対する上記バインダーの含有量が上記下限未満の場合、最外層の塗工層の強度が十分に得られないおそれがある。逆に、上記顔料１００質量部に対する上記バインダーの含有量が上記上限を超える場合、最外層の塗工層内の密着性が高くなり、製造工程におけるブロッキング、貼り付き等が生じるおそれがある。これに対し、上記顔料１００質量部に対する上記バインダーの含有量が上記範囲である場合、最外層の塗工層の強度、粘着性等の物性を好適に調整することができる。 As the lower limit of the content (in terms of solid content) of the binder with respect to 100 parts by mass of the pigment, 5 parts by mass is preferable, 7 parts by mass is more preferable, and 9 parts by mass is further preferable. On the other hand, the upper limit of the content (in terms of solid content) of the binder with respect to 100 parts by mass of the pigment is preferably 25 parts by mass, more preferably 23 parts by mass, and even more preferably 21 parts by mass. If the content of the binder with respect to 100 parts by mass of the pigment is less than the above lower limit, the strength of the outermost coating layer may not be sufficiently obtained. On the contrary, when the content of the binder with respect to 100 parts by mass of the pigment exceeds the upper limit, the adhesion in the coating layer of the outermost layer becomes high, and blocking, sticking, etc. in the manufacturing process may occur. On the other hand, when the content of the binder with respect to 100 parts by mass of the pigment is within the above range, physical properties such as strength and adhesiveness of the outermost coating layer can be suitably adjusted.
なお、上記基紙の一方の面側に複数の塗工層が積層される場合、全ての塗工層が上記顔料及びバインダーを含むことが好ましい。ただし、当該後糊圧着記録用原紙においては、少なくとも最外層の塗工層が上記顔料及びバインダーを含む限り、その他の塗工層は必ずしも上記顔料及びバインダーを含まなくてもよい。また、上記顔料及びバインダーを含まない場合の塗工層としては、例えば水溶性接着剤からなるクリア塗工層が挙げられる。 When a plurality of coating layers are laminated on one surface side of the base paper, it is preferable that all the coating layers contain the pigment and the binder. However, in the base paper for post-glue pressure bonding recording, as long as at least the outermost coating layer contains the pigment and the binder, the other coating layers do not necessarily have to contain the pigment and the binder. In addition, examples of the coating layer when the pigment and the binder are not contained include a clear coating layer made of a water-soluble adhesive.
上記塗工層（塗工液）には、上記顔料及びバインダーの他、例えば顔料分散剤、増粘剤、流動性改良剤、消泡剤、抑泡剤、滑剤、離型剤、発泡剤、浸透剤、着色染料、着色顔料、蛍光増白剤、紫外線吸収剤、酸化防止剤、防腐剤、防黴剤、耐水化剤、染料、定着剤等の通常の添加剤や、ステアリン酸、ステアリン酸カルシウム、オレイン酸、オレイン酸カルシウム、オレイン酸アンモニウム、レシチン、ポリエチレン、ワックス又はこれらの誘導体等の助剤を必要に応じて適宜配合することができる。 In addition to the pigments and binders, the coating layer (coating liquid) includes, for example, pigment dispersants, thickeners, fluidity improvers, defoamers, foam suppressants, lubricants, mold release agents, foaming agents, and the like. Ordinary additives such as penetrants, coloring dyes, coloring pigments, fluorescent whitening agents, ultraviolet absorbers, antioxidants, preservatives, mold repellents, water resistant agents, dyes, fixing agents, stearic acid, calcium stearate , Oleic acid, calcium oleate, ammonium oleate, lecithin, polyethylene, wax or derivatives thereof and the like can be appropriately blended as needed.
上記塗工層の塗工量（固形分換算）の下限としては、７．５ｇ／ｍ２が好ましく、９．０ｇ／ｍ２がより好ましく、９．５ｇ／ｍ２がさらに好ましい。一方、上記塗工層の塗工量（固形分換算）の上限としては、１５．０ｇ／ｍ２が好ましく、１４．０ｇ／ｍ２がより好ましく、１３．０ｇ／ｍ２がさらに好ましい。上記塗工層の塗工量が上記下限未満の場合、十分な印刷適性が得られないおそれがある。逆に、上記塗工層の塗工量が上記上限を超える場合、塗工層の硬化に起因して柔軟性が低下し、当該後糊圧着記録用原紙の加工適性が低下するおそれがある。なお、上記塗工層の塗工量は、塗工層が複数積層される場合においては各塗工層の塗工量を意味する。 It said coating layer coating amount of the lower limit of (in terms of solid content) is preferably 7.5 g / m 2, more preferably 9.0 g / m 2, more preferably 9.5 g / m 2. In contrast, the upper limit of the application amount of the application layer (in terms of solid content) is preferably from 15.0 g / m 2, more preferably 14.0 g / m 2, more preferably 13.0 g / m 2. If the coating amount of the coating layer is less than the above lower limit, sufficient printability may not be obtained. On the contrary, when the coating amount of the coating layer exceeds the above upper limit, the flexibility may decrease due to the curing of the coating layer, and the processing suitability of the base paper for post-glue pressure bonding recording may decrease. The coating amount of the coating layer means the coating amount of each coating layer when a plurality of coating layers are laminated.
また、当該後糊圧着記録用原紙は、上記基紙がポリアクリルアミド系紙力増強剤を含み、上記塗工層のうち、最外層の塗工層が顔料としてカオリンを含み、上記最外層の塗工層の全顔料１００質量部に対する上記カオリンの含有量が上記下限以上であり、上記最外層の塗工層の塗工量が上記範囲であることによって、接着剤の最外層の塗工層への浸透が効果的に抑えられ、再剥離時の材料破壊をさらに効果的に抑制することができる。加えて、上記基紙がポリアクリルアミド系紙力増強剤を含む場合、このポリアクリルアミド系紙力増強剤によって接着剤の基紙への浸透を抑制することができる。また、このポリアクリルアミド系紙力増強剤は接着剤として用いられる紫外線硬化型ニスとの相溶性が高いため、紫外線硬化型ニスが基紙内に浸透した場合でも、この紫外線硬化型ニスによって基紙内が目止めされることで基紙の強度の低下が抑えられ、ひいてはＺ軸方向の剥離強度の低下を防止することができる。 Further, in the base paper for post-glue pressure bonding recording, the base paper contains a polyacrylamide-based paper strength enhancer, the outermost coating layer of the coating layers contains kaolin as a pigment, and the outermost coating layer is coated. When the content of the kaolin in 100 parts by mass of the total pigment of the working layer is equal to or higher than the above lower limit and the amount of the coating layer of the outermost layer is in the above range, the coating layer of the outermost layer of the adhesive is coated. Permeation is effectively suppressed, and material destruction at the time of re-peeling can be further effectively suppressed. In addition, when the base paper contains a polyacrylamide-based paper strength enhancer, the polyacrylamide-based paper strength enhancer can suppress the penetration of the adhesive into the base paper. In addition, since this polyacrylamide-based paper strength enhancer has high compatibility with the ultraviolet-curable varnish used as an adhesive, even if the ultraviolet-curable varnish penetrates into the base paper, the base paper will be used by this ultraviolet-curable varnish. By sealing the inside, a decrease in the strength of the base paper can be suppressed, and by extension, a decrease in the peel strength in the Z-axis direction can be prevented.
上記最外層の塗工層表面の平滑度の下限としては、１４０秒が好ましく、１５０秒がより好ましく、１６０秒がさらに好ましい。一方、上記最外層の塗工層表面の平滑度の上限としては、２１０秒が好ましく、２００秒がより好ましく、１９０秒がさらに好ましい。上記最外層の塗工層表面の平滑度が上記下限未満の場合、疑似接着層を形成する接着剤が塗工層内に過度に含浸したり、塗布液の浸透ムラ、塗布液の浸透速度ムラ等が生じるおそれがある。逆に、上記最外層の塗工層表面の平滑度が上記上限を超える場合、最外層の塗工層表面が緻密になり疑似接着層を積層した際に塗布液のアンカー効果が十分かつ均等に得られず、再剥離性にムラが生じるおそれがある。なお、「平滑度」は、ＪＩＳ−Ｐ８１１９（１９９８）に記載の「紙及び板紙−ベック平滑度試験機による平滑度試験方法」に準拠した値である。 The lower limit of the smoothness of the surface of the coating layer of the outermost layer is preferably 140 seconds, more preferably 150 seconds, and even more preferably 160 seconds. On the other hand, the upper limit of the smoothness of the surface of the coating layer of the outermost layer is preferably 210 seconds, more preferably 200 seconds, and even more preferably 190 seconds. When the smoothness of the coating layer surface of the outermost layer is less than the above lower limit, the adhesive forming the pseudo-adhesive layer is excessively impregnated in the coating layer, the coating liquid permeates unevenly, and the coating liquid permeates unevenly. Etc. may occur. On the contrary, when the smoothness of the coating layer surface of the outermost layer exceeds the upper limit, the coating layer surface of the outermost layer becomes dense and the anchor effect of the coating liquid is sufficiently and evenly obtained when the pseudo-adhesive layer is laminated. It may not be obtained and the removability may be uneven. The "smoothness" is a value based on the "paper and paperboard-smoothness test method using a Beck smoothness tester" described in JIS-P8119 (1998).
上記最外層の塗工層表面のＰＰＳ平滑度の下限としては、１．６μｍが好ましく、１．８μｍがより好ましく、２．０μｍがさらに好ましい。一方、上記最外層の塗工層表面のＰＰＳ平滑度の上限としては、３．２μｍが好ましく、３．０μｍがより好ましく、２．８μｍがさらに好ましい。上記最外層の塗工層表面のＰＰＳ平滑度が上記下限未満の場合、最外層の塗工層表面が緻密になり疑似接着層を積層した際に塗布液のアンカー効果が十分かつ均等に得られず、再剥離性にムラが生じるおそれがある。逆に、ＰＰＳ平滑度が上記上限を超える場合、疑似接着層を形成する接着剤が塗工層内に過度に含浸したり、塗布液の浸透ムラ、塗布液の浸透速度ムラ等が生じるおそれがある。 The lower limit of the PPS smoothness on the surface of the coating layer of the outermost layer is preferably 1.6 μm, more preferably 1.8 μm, and even more preferably 2.0 μm. On the other hand, the upper limit of the PPS smoothness on the surface of the coating layer of the outermost layer is preferably 3.2 μm, more preferably 3.0 μm, and even more preferably 2.8 μm. When the PPS smoothness of the coating layer surface of the outermost layer is less than the above lower limit, the coating layer surface of the outermost layer becomes dense and the anchor effect of the coating liquid can be sufficiently and evenly obtained when the pseudo-adhesive layer is laminated. However, there is a risk of uneven removability. On the contrary, when the PPS smoothness exceeds the above upper limit, the adhesive forming the pseudo-adhesive layer may be excessively impregnated in the coating layer, uneven penetration of the coating liquid, uneven penetration speed of the coating liquid, etc. may occur. is there.
なお、上記基紙の両面側に塗工層が積層される場合、各々の面側の塗工層の成分、塗工量、平滑度等の構成を上記構成とすることができる。 When the coating layers are laminated on both side surfaces of the base paper, the composition of the coating layer components, the coating amount, the smoothness, etc. on each surface side can be configured as described above.
＜後糊圧着記録用原紙の品質＞
当該後糊圧着記録用原紙の坪量としては、８０．０ｇ／ｍ２以上１６０．０ｇ／ｍ２以下とされている。
<Quality of base paper for post-glue crimp recording>
The basis weight of the post-adhesive bonding recording sheet, there is a 80.0 g / m 2 or more 160.0 g / m 2 or less.
当該後糊圧着記録用原紙のＺ軸方向の剥離強度を上記坪量で除した値としては、３．８ｋＰａ／ｇ／ｍ２以上とされている。また、当該後糊圧着記録用原紙のＺ軸方向の剥離強度を上記坪量で除した値の下限としては、５．５ｋＰａ／ｇ／ｍ２がより好ましく、６．６ｋＰａ／ｇ／ｍ２がさらに好ましい。上記Ｚ軸方向の剥離強度を上記坪量で除した値が上記下限未満の場合、層間強度が十分に得られず、再剥離時等に材料破壊が生じるおそれがある。 The value obtained by dividing the peel strength in the Z-axis direction of the base paper for post-glue pressure bonding recording by the above basis weight is 3.8 kPa / g / m 2 or more. Also, the peel strength in the Z-axis direction of the post-adhesive bonding recording sheet as the lower limit of the value obtained by dividing the above basis weight, more preferably 5.5kPa / g / m 2, is 6.6kPa / g / m 2 More preferred. If the value obtained by dividing the peel strength in the Z-axis direction by the basis weight is less than the above lower limit, sufficient interlayer strength may not be obtained, and material may be destroyed during re-peeling or the like.
当該後糊圧着記録用原紙のトルエン吸油度としては、１００秒以上とされている。また、当該後糊圧着記録用原紙のトルエン吸油度の下限としては、１１０秒がより好ましく、１２０秒がさらに好ましい。上記トルエン吸油度が上記下限未満の場合、疑似接着剤を形成する紫外線硬化型ニス等が過度に含浸され、疑似接着剤層の接着性が低下するおそれがある。 The toluene oil absorption of the base paper for post-glue pressure bonding recording is set to 100 seconds or more. Further, as the lower limit of the toluene oil absorption of the base paper for post-glue pressure bonding recording, 110 seconds is more preferable, and 120 seconds is further preferable. If the toluene oil absorption is less than the above lower limit, the ultraviolet curable varnish or the like forming the pseudo-adhesive may be excessively impregnated, and the adhesiveness of the pseudo-adhesive layer may be lowered.
＜疑似接着剤層＞
当該後糊圧着記録用原紙は、基紙の一方の面側又は両面側に塗工層が積層され、この塗工層の表面に疑似接着剤層が積層された後糊圧着記録用紙として好適に用いられる。この疑似接着剤層を形成する接着剤としては、特に限定されるものではないが、紫外線硬化成分、アクリル重合体、光重合開始剤等が相溶される紫外線硬化型ニス組成物が好適に用いられる。
<Pseudo adhesive layer>
The base paper for post-glue crimp recording is suitable as a post-glue crimp recording paper in which a coating layer is laminated on one side or both sides of the base paper and a pseudo-adhesive layer is laminated on the surface of the coating layer. Used. The adhesive forming the pseudo-adhesive layer is not particularly limited, but an ultraviolet-curable varnish composition in which an ultraviolet-curable component, an acrylic polymer, a photopolymerization initiator and the like are compatible with each other is preferably used. Be done.
上記疑似接着剤層の塗工量（固形分換算）の下限としては、１ｇ／ｍ２が好ましく、２ｇ／ｍ２がより好ましく、４ｇ／ｍ２がさらに好ましい。一方、上記疑似接着剤層の塗工量（固形分換算）の上限としては、１５ｇ／ｍ２が好ましく、１３ｇ／ｍ２がより好ましく、１０ｇ／ｍ２がさらに好ましい。上記疑似接着剤層の塗工量が上記下限未満の場合、十分な接着性が得られないおそれがある。逆に、上記疑似接着剤層の塗工量が上記上限を超える場合、再剥離時に後糊圧着記録用原紙が破壊されるおそれがある。 As the lower limit of the coating amount (in terms of solid content) of the pseudo-adhesive layer, 1 g / m 2 is preferable, 2 g / m 2 is more preferable, and 4 g / m 2 is further preferable. In contrast, the upper limit of the application amount of the pseudo adhesive layer (solid content), preferably 15 g / m 2, more preferably 13 g / m 2, more preferably 10 g / m 2. If the amount of the pseudo-adhesive layer applied is less than the above lower limit, sufficient adhesiveness may not be obtained. On the contrary, when the amount of the pseudo-adhesive layer applied exceeds the above upper limit, the base paper for post-glue pressure bonding recording may be destroyed at the time of re-peeling.
＜後糊圧着記録用原紙の製造方法＞
当該後糊圧着記録用原紙の製造方法としては、特に限定されず、例えば原料パルプスラリーを抄紙し、プレスパート及びプレドライヤーパートに供して基紙を製造する工程と、アンダーコーターパートにてアンダー塗工液を塗工した上、乾燥及び平坦化処理してアンダー塗工層を積層する工程と、塗工液を塗工し、カレンダー処理を施す工程とを有する。なお、当該後糊圧着記録用原紙がアンダー塗工層を有しない場合には、上記アンダーコーターパートに替えて、基紙表面に表面処理を施し、乾燥及び平坦化処理を行ってもよい。
<Manufacturing method of base paper for post-glue crimp recording>
The method for producing the base paper for post-glue pressure bonding recording is not particularly limited. It has a step of laminating an undercoating layer by applying a working liquid and then drying and flattening it, and a step of applying a coating liquid and performing a calendar treatment. When the base paper for post-glue pressure bonding recording does not have an undercoating layer, the surface of the base paper may be surface-treated, dried and flattened instead of the undercoater part.
塗工液又はアンダー塗工液を塗工する際の塗工装置としては、例えばサイズプレス、ブレードメタリングサイズプレス、ロッドメタリングサイズプレス、ブレードコータ、バーコータ、ゲートロールコータ、ロッドコータ、エアナイフコータ等が挙げられる。 Examples of the coating device for applying the coating liquid or the undercoating liquid include size press, blade metering size press, rod metering size press, blade coater, bar coater, gate roll coater, rod coater, and air knife coater. And so on.
また、カレンダー処理の際のカレンダー装置としては、例えばスーパーカレンダ、グロスカレンダ、ソフトコンパクトカレンダ等の金属又はドラムと弾性ロールとの組み合わせによる各種カレンダーがオンマシン又はオフマシン仕様で適宜使用される。 Further, as a calendar device for calendar processing, for example, various calendars made of metal such as a super calendar, a gloss calendar, a soft compact calendar, or a combination of a drum and an elastic roll are appropriately used with on-machine or off-machine specifications.
なお、当該後糊圧着記録用原紙は、上記アンダー塗工液又は塗工液を複数回塗工してもよい。 The base paper for post-glue pressure bonding recording may be coated with the undercoating liquid or the coating liquid a plurality of times.
＜後糊圧着記録用紙の製造方法＞
当該後糊圧着記録用原紙の塗工層表面に疑似接着剤層が積層される後糊圧着記録用紙の製造方法としては、例えば上記塗工層の表面側にオフセット印刷及びインクジェット印刷を施した上、紫外線硬化型ニス組成物を塗工し硬化させる方法が挙げられる。
<Manufacturing method of post-glue crimping recording paper>
As a method for manufacturing a post-glue crimp recording paper in which a pseudo-adhesive layer is laminated on the surface of the coating layer of the base paper for post-glue crimp recording, for example, offset printing and inkjet printing are performed on the surface side of the coating layer. , A method of applying and curing an ultraviolet curable varnish composition can be mentioned.
上記紫外線硬化型ニス組成物を塗工する塗工装置としては、例えばロールコータ、フレキソコータ、グラビアコータ、エアナイフコータ等が挙げられる。また、上記紫外線硬化型ニス組成物の硬化方法としては、例えばケミカルランプ、低圧水銀灯、中圧水銀灯、高圧水銀灯、超高圧水銀灯、キセノンランプ、メタルハライドランプ等の紫外線照射装置を用い、８０Ｗ／ｃｍ以上２８０Ｗ／ｃｍ以下の照射強度で、積算光量が１５ｍＪ／ｃｍ２以上４００ｍＪ／ｃｍ２以下（Ｒｉｇａｋｕ Ｉｎｎｏｖａｔｉｖｅ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｉｎｃ．製の「ＵＶＩＭＡＰ ＵＭ−３６５ＨＳ」で測定）となるように照射して乾燥させる方法が挙げられる。 Examples of the coating device for applying the ultraviolet curable varnish composition include a roll coater, a flexographic coater, a gravure coater, and an air knife coater. Further, as a method for curing the ultraviolet curable varnish composition, for example, an ultraviolet irradiation device such as a chemical lamp, a low pressure mercury lamp, a medium pressure mercury lamp, a high pressure mercury lamp, an ultrahigh pressure mercury lamp, a xenon lamp, or a metal halide lamp is used, and 80 W / cm or more. the following irradiation intensity 280 W / cm, a method of integrated light quantity is dried by irradiation so that 15 mJ / cm 2 or more 400 mJ / cm 2 or less (Rigaku Innovative Technologies Inc. manufactured measured by "UVIMAP UM-365HS") is Can be mentioned.
さらに、上記疑似接着剤層が対向するように折曲げて圧着する方法としては、例えば必要に応じて加熱しつつ１０ｋｇ／ｃｍ２以上３０００ｋｇ／ｃｍ２以下の圧力で加圧する方法が挙げられ、かかる方法によった場合の剥離強度としては、例えば４０ｇ／１５ｍｍ以上３００ｇ／１５ｍｍ以下とされる。 Further, as a method of bending and crimping the pseudo-adhesive layers so as to face each other, for example, a method of pressurizing at a pressure of 10 kg / cm 2 or more and 3000 kg / cm 2 or less while heating as necessary can be mentioned. The peel strength according to the method is, for example, 40 g / 15 mm or more and 300 g / 15 mm or less.
以下、実施例によって本発明をさらに詳細に説明するが、本発明はこれらの実施例に限定されるものではない。なお、実施例及び比較例において、測定は下記の方法によって行った。 Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to these Examples. In the examples and comparative examples, the measurement was carried out by the following method.
＜坪量＞
坪量（ｇ／ｍ２）は、ＪＩＳ−Ｐ−８１２４（２０１１）「紙及び板紙−坪量の測定方法」に準拠して測定した。
<Basis weight>
The basis weight (g / m 2 ) was measured in accordance with JIS-P-8124 (2011) "Paper and Paperboard-Measurement Method of Basis Weight".
＜Ｚ軸方向の剥離強度＞
Ｚ軸方向の剥離強度（ｋＰａ）は、ＴＡＰＰＩ Ｔ ５４１に準拠して、Ｌｏｒｅｎｔｚｅｎ ＆ Ｗｅｔｔｒｅ製の「Ｌ＆Ｗ ＺＤＴＥＮＳＩＬＥ ＴＥＳＴＥＲ」を用いて測定した。
<Peeling strength in the Z-axis direction>
The peel strength (kPa) in the Z-axis direction was measured using "L & W ZDTENSILE TESTER" manufactured by Lorentzen & Wettre in accordance with TAPPI T 541.
＜トルエン吸油度＞
トルエン吸油度（秒）は、ＪＩＳ−Ｐ−８１３０（１９９４）「吸油度試験方法」に準拠して、試験油としてトルエン（米山薬品工業株式会社製）を用いて測定した。
<Toluene oil absorption>
Toluene oil absorption (seconds) was measured using toluene (manufactured by Yoneyama Yakuhin Kogyo Co., Ltd.) as the test oil in accordance with JIS-P-8130 (1994) "Oil absorption test method".
＜ステキヒトサイズ度＞
ステキヒトサイズ度（秒）は、ＪＩＳ−Ｐ−８１２２（２００４）「紙及び板紙−サイズ度試験方法−ステキヒト法」に準拠して測定した。
<Stunning human size>
The degree of sizing (seconds) was measured in accordance with JIS-P-8122 (2004) "Paper and paperboard-size test method-Stechhito method".
＜接着性＞
後糊圧着記録用原紙の塗工層の表面に紫外線硬化型ニス組成物（互応化学工業株式会社製プラスサイズＯＰ−５２２０）を塗工量１０．０ｇ／ｍ２（固形分換算）で塗工し、高圧水銀ランプにて紫外線硬化させて疑似接着剤層を積層した後糊圧着記録用紙を疑似接着剤層が対向するように折り曲げて、圧着シーラ（大日本印刷株式会社製のＭＳ−９１００）を用い、シーラギャップ７の条件で圧着した状態における接着状態を以下の基準で判定した。
（評価基準）
◎：完全に接着しており、折り曲げても接着箇所の剥がれは生じない。
○：ほぼ接着しており、折り曲げても接着面に浮き剥がれは生じない。
△：一応接着するが、弱く、曲げれば接着面に浮き剥がれが生じる場合がある。
×：接着が弱いか又は全く接着しない。
<Adhesiveness>
Apply an ultraviolet curable varnish composition (plus size OP-5220 manufactured by GOO CHEMICAL CO., LTD.) On the surface of the coating layer of the base paper for post-glue pressure bonding recording at a coating rate of 10.0 g / m 2 (solid content equivalent). Then, after curing with ultraviolet rays with a high-pressure mercury lamp and laminating the pseudo-adhesive layer, the glue crimp recording paper is bent so that the pseudo-adhesive layers face each other, and the crimp sealer (MS-9100 manufactured by Dainippon Printing Co., Ltd.) Was used to determine the adhesive state in the state of being crimped under the condition of the sealer gap 7 according to the following criteria.
(Evaluation criteria)
⊚: It is completely adhered, and even if it is bent, the adhered portion does not peel off.
◯: It is almost adhered, and even if it is bent, the adhesive surface does not come off.
Δ: Adhesive for the time being, but it is weak, and if it is bent, the adhesive surface may float and peel off.
X: Adhesion is weak or does not adhere at all.
＜再剥離性＞
後糊圧着記録用原紙の塗工層の表面に紫外線硬化型ニス組成物（互応化学工業株式会社製プラスサイズＯＰ−５２２０）を塗工量１０．０ｇ／ｍ２（固形分換算）で塗工し、高圧水銀ランプにて紫外線硬化させて疑似接着剤層を積層した後糊圧着記録用紙を疑似接着剤層が対向するように折り曲げて、圧着シーラ（大日本印刷株式会社製のＭＳ−９１００）を用い、シーラギャップ７の条件で圧着し、圧着直後の剥離性と６０℃、９０％ＲＨの環境下に２時間放置した後の剥離性について以下の基準で判定した。
（評価基準）
○：紙破れなく剥がれた。
△：紙破れなく剥がれるが、剥離強度が強く、表面のニス面に割れ筋が入る場合がある。
×：接着してしまい、剥がそうとすれば紙が破れた。
−：最初から未接着のため判定不能であった。
<Removability>
Apply UV curable varnish composition (plus size OP-5220 manufactured by GOO CHEMICAL CO., LTD.) On the surface of the coating layer of the base paper for post-glue pressure bonding recording with a coating amount of 10.0 g / m 2 (solid content equivalent). Then, after curing with ultraviolet rays with a high-pressure mercury lamp and laminating the pseudo-adhesive layer, the glue crimp recording paper is bent so that the pseudo-adhesive layers face each other, and the crimp sealer (MS-9100 manufactured by Dainippon Printing Co., Ltd.) Was crimped under the condition of sealer gap 7, and the peelability immediately after crimping and the peelability after being left in an environment of 60 ° C. and 90% RH for 2 hours were judged according to the following criteria.
(Evaluation criteria)
◯: The paper was peeled off without tearing.
Δ: The paper can be peeled off without tearing, but the peeling strength is strong, and cracks may appear on the varnish surface of the surface.
X: The paper adhered and the paper was torn when I tried to peel it off.
-: It was impossible to judge because it was not adhered from the beginning.
［実施例１］
フリーネス３８０ｍｌの広葉樹晒クラフトパルプ（ＬＢＫＰ）８０質量部及びフリーネス５５０ｍｌの針葉樹晒クラフトパルプ（ＮＢＫＰ）２０質量部からなるパルプスラリーに、湿式重質炭酸カルシウム３０．０ｋｇ／ｔ、歩留向上剤（エカケミカルス株式会社製の「ＮＰ２４７」）０．３ｋｇ／ｔ、内添サイズ剤（東邦化学工業株式会社製の「ＦＫ３４改」）０．３ｋｇ／ｔを添加してなる紙料スラリーを用いて抄紙して基紙を得た。次に、この基紙の両面に、バインダー（澱粉（日本食品株式会社製の「ＲＣ＃２０」８．０質量部及びラテックス（ＪＳＲ株式会社製の「ＰＢ２９０１」）６．０質量部）並びに平均粒子径１．４μｍの湿式重質炭酸カルシウム１００質量部を含有するアンダー塗工液を両面で１２．０ｇ／ｍ２（固形分換算）で塗工してアンダー塗工層を形成した。さらに、各塗工層の表面に、バインダー（澱粉（日本食品株式会社製の「ＲＣ＃２０」）２．５質量部及びＳＢＲラテックス（ＪＳＲ株式会社製の「ＰＢ２９０１」）７．５質量部）、顔料（平均粒子径２．３μｍのカオリン３５質量部及び平均粒子径１．１μｍの湿式重質炭酸カルシウム６５質量部）からなる塗工液を両面で２３．０ｇ／ｍ２（固形分換算）で塗工して坪量１２７．９ｇ／ｍ２の後糊圧着記録用原紙を得た。なお、上記記載の薬品添加量は、絶乾パルプ量に対する固形分換算した量で記載した。また、アンダー塗工層及び塗工層の片面あたりの塗工量は、両面の塗工量の略１／２となるように塗工した。
[Example 1]
Wet heavy calcium carbonate 30.0 kg / t, yield improver (Eka Chemicals) in a pulp slurry consisting of 80 parts by mass of freeness 380 ml broadleaf bleached kraft pulp (LBKP) and 20 parts by mass of freeness 550 ml coniferous bleached kraft pulp (NBKP). Paper making using a paper pulp slurry added with 0.3 kg / t of "NP247" manufactured by Toho Kagaku Kogyo Co., Ltd. and 0.3 kg / t of internal sizing agent ("FK34 Kai" manufactured by Toho Kagaku Kogyo Co., Ltd.) I got the base paper. Next, on both sides of this base paper, a binder (starch (8.0 parts by mass of "RC # 20" manufactured by Nippon Foods Co., Ltd. and 6.0 parts by mass of latex ("PB2901" manufactured by JSR Corporation)) and an average. An undercoating solution containing 100 parts by mass of wet heavy calcium carbonate having a particle size of 1.4 μm was applied on both sides at 12.0 g / m 2 (solid content equivalent) to form an undercoating layer. On the surface of each coating layer, 2.5 parts by mass of starch (“RC # 20” manufactured by Nippon Foods Co., Ltd.) and 7.5 parts by mass of SBR latex (“PB2901” manufactured by JSR Corporation), pigment. (35 parts by mass of kaolin with an average particle size of 2.3 μm and 65 parts by mass of wet heavy calcium carbonate with an average particle size of 1.1 μm) is applied on both sides at 23.0 g / m 2 (solid content equivalent). After the work, a base paper for post-glue crimping recording having a basis weight of 127.9 g / m 2 was obtained. The amount of the chemical added described above was described as an amount converted into a solid content with respect to the amount of absolute dry starch. The coating amount per one side of the work layer and the coating layer was about 1/2 of the coating amount on both sides.
［実施例２〜１０及び比較例１〜５］
原料に用いた広葉樹晒クラフトパルプ（ＬＢＫＰ）及び針葉樹晒クラフトパルプ（ＮＢＫＰ）の含有割合、バインダー及び顔料の種類及び含有割合、アンダー塗工層及び塗工層の塗工量、並びに後糊圧着記録用原紙の坪量を表１の通りとし、実施例２〜１０及び比較例１〜５の後糊圧着記録用原紙を得た。
[Examples 2 to 10 and Comparative Examples 1 to 5]
Content ratio of hardwood bleached kraft pulp (LBKP) and softwood bleached kraft pulp (NBKP) used as raw materials, types and content ratios of binders and pigments, coating amount of undercoating layer and coating layer, and post-glue pressure bonding record The basis weight of the base paper for use was set as shown in Table 1, and the base paper for post-glue pressure bonding recording of Examples 2 to 10 and Comparative Examples 1 to 5 was obtained.
また、実施例１〜１０及び比較例１〜５で得られた後糊圧着記録用原紙について、上述のＺ軸方向の剥離強度、トルエン吸油度及びステキヒトサイズ度を測定した。さらに、実施例１〜１０及び比較例１〜５で得られた後糊圧着記録用原紙について、上述の接着性及び再剥離性について評価を行った。上記測定結果及び評価結果について、表２に示す。 Further, with respect to the post-glue crimping recording base papers obtained in Examples 1 to 10 and Comparative Examples 1 to 5, the above-mentioned peel strength in the Z-axis direction, the degree of toluene oil absorption and the degree of stekihito size were measured. Further, the post-glue pressure-bonding recording base papers obtained in Examples 1 to 10 and Comparative Examples 1 to 5 were evaluated for the above-mentioned adhesiveness and removability. Table 2 shows the above measurement results and evaluation results.
表２の結果から示されるように、実施例１〜１０の後糊圧着記録用原紙は、優れた接着性を有すると共に再剥離性に優れている。一方、比較例１〜５の後糊圧着記録用原紙は、いずれもトルエン吸油度が１００秒未満であるため、接着性及び再剥離性が共に劣ることが分かった。 As shown from the results in Table 2, the base papers for post-glue pressure bonding recording of Examples 1 to 10 have excellent adhesiveness and removability. On the other hand, it was found that the base papers for post-glue pressure bonding recording in Comparative Examples 1 to 5 were inferior in both adhesiveness and removability because the toluene oil absorption was less than 100 seconds.
当該後糊圧着記録用原紙は、オフセット印刷適性及びインクジェット印刷適性を有すると共に、接着性を維持しつつ優れた剥離性を有し、例えば郵送用途に用いられる後糊圧着記録用紙用の原紙として好適に用いられる。 The base paper for post-glue crimping recording has offset printing suitability and inkjet printing suitability, and also has excellent peelability while maintaining adhesiveness, and is suitable as a base paper for post-glue crimping recording paper used for mailing purposes, for example. Used for.
Claims (3)
上記基紙が、パルプ繊維として広葉樹クラフトパルプ及び針葉樹クラフトパルプを併用し、全パルプ成分１００質量部に対する上記広葉樹クラフトパルプの含有量が６５質量部以上８０質量部以下であり、全パルプ成分１００質量部に対する上記針葉樹クラフトパルプの含有量が２０質量部以上３５質量部以下であり、
上記塗工層のうち、最外層の塗工層が顔料及びバインダーを含み、
上記最外層の塗工層の顔料が重質炭酸カルシウム及びカオリンからなり、
上記最外層の塗工層の全顔料１００質量部に対する上記カオリンの含有量が３５質量部以上８０質量部以下であり、
ＪＩＳ−Ｐ８１１９（１９９８）に記載の「紙及び板紙−ベック平滑度試験機による平滑度試験方法」に準拠して測定される上記最外層の塗工層表面の平滑度が１４０秒以上２１０秒以下であり、
顔料及びバインダーを含むアンダー塗工層を備え、
上記アンダー塗工層の顔料が重質炭酸カルシウムを含み、
上記アンダー塗工層のバインダーが澱粉及びＳＢＲラテックスであり、
上記アンダー塗工層の顔料１００質量部に対する上記澱粉及び上記ＳＢＲラテックスの合計含有量が２質量部以上２５質量部以下であり、
上記澱粉及び上記ＳＢＲラテックスの質量基準の配合比としては８：７以上８：５以下であり、
上記アンダー塗工層の片面あたりの塗工量が５．５ｇ／ｍ２以上７．５ｇ／ｍ２以下であり、
坪量が８０．０ｇ／ｍ２以上１６０．０ｇ／ｍ２以下であり、
Ｚ軸方向の剥離強度を上記坪量で除した値が３．８ｋＰａ／ｇ／ｍ２以上であり、
トルエン吸油度が１００秒以上であることを特徴とする後糊圧着記録用原紙。 A base paper and a base paper for post-glue pressure bonding recording provided with a plurality of coating layers laminated on at least one surface side of the base paper.
The base paper uses both broadleaf kraft pulp and coniferous kraft pulp as pulp fibers, and the content of the broadleaf kraft pulp with respect to 100 parts by mass of the total pulp component is 65 parts by mass or more and 80 parts by mass or less, and 100 parts by mass of the total pulp component. The content of the coniferous kraft pulp with respect to the portion is 20 parts by mass or more and 35 parts by mass or less.
Of the above coating layers, the outermost coating layer contains a pigment and a binder, and contains
The pigment of the coating layer of the outermost layer is composed of heavy calcium carbonate and kaolin.
The content of the kaolin in 100 parts by mass of the total pigment of the coating layer of the outermost layer is 35 parts by mass or more and 80 parts by mass or less.
The smoothness of the surface of the coating layer of the outermost layer measured in accordance with "Paper and Paperboard-Smoothness Test Method by Beck Smoothness Tester" described in JIS-P8119 (1998) is 140 seconds or more and 210 seconds or less. And
With an undercoat layer containing pigments and binders
The pigment in the undercoat layer contains heavy calcium carbonate
The binder of the undercoat layer is starch and SBR latex.
The total content of the starch and the SBR latex with respect to 100 parts by mass of the pigment in the undercoat layer is 2 parts by mass or more and 25 parts by mass or less.
The mass-based compounding ratio of the starch and the SBR latex is 8: 7 or more and 8: 5 or less.
The coating amount per one side of the undercoating layer is 5.5 g / m 2 or more and 7.5 g / m 2 or less.
The basis weight is at 80.0 g / m 2 or more 160.0 g / m 2 or less,
The value obtained by dividing the peel strength in the Z-axis direction by the above basis weight is 3.8 kPa / g / m 2 or more.
A base paper for post-glue crimping recording, which comprises a toluene oil absorption of 100 seconds or more.
上記最外層の片面当たりの塗工層の塗工量が７．５ｇ／ｍ２以上１５．０ｇ／ｍ２以下である請求項１に記載の後糊圧着記録用原紙。 The base paper contains a polyacrylamide-based paper strength enhancer and contains
The base paper for post-glue pressure bonding recording according to claim 1 , wherein the coating amount of the coating layer per one side of the outermost layer is 7.5 g / m 2 or more and 15.0 g / m 2 or less.
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