JP2010274606A - Inkjet postcard paper - Google Patents
Inkjet postcard paper Download PDFInfo
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- JP2010274606A JP2010274606A JP2009131472A JP2009131472A JP2010274606A JP 2010274606 A JP2010274606 A JP 2010274606A JP 2009131472 A JP2009131472 A JP 2009131472A JP 2009131472 A JP2009131472 A JP 2009131472A JP 2010274606 A JP2010274606 A JP 2010274606A
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Abstract
Description
本発明は、古紙パルプを含有したインクジェット記録用葉書用紙に関するものであり、インクジェットプリンター印字後の滲みがなく、宛名面における水性ペンでの筆記性に優れ、更には版持ちなどのプロセス印刷適性が良好なインクジェット用葉書用紙に関する。 The present invention relates to a postcard paper for ink-jet recording containing waste paper pulp, has no bleeding after ink-jet printer printing, has excellent writing performance with a water-based pen on the address side, and further has suitability for process printing such as plate holding. It relates to a good ink jet postcard paper.
近年、インクジェット記録方式が一般大衆へ普及するに伴い、葉書にも採用されるようになってきており、インクジェット記録用の葉書に関する技術もある（例えば、特許文献１又は特許文献２を参照。）。 In recent years, as the ink jet recording system has spread to the general public, it has come to be used in postcards, and there is also a technique related to postcards for ink jet recording (see, for example, Patent Document 1 or Patent Document 2). .
葉書には、通常、郵便番号枠、切手貼り付け枠、又はお年玉付き年賀葉書の抽選番号等が宛名面側にプロセス印刷によって印刷されるが、近年、印刷速度の高速化に伴い、宛名面の表面強さをはじめとする印刷適性への要求が大きくなっている。 Normally, postcards, postage stamps, lottery numbers for New Year's postcards with New Year's cards, etc. are printed on the address side by process printing on postcards. There is a growing demand for printability including surface strength.
また、近年、紙製品での環境配慮としてのリサイクル、すなわち、古紙パルプを多く配合することが重要であり、ユーザーからの要求も大きくなっている。 In recent years, it has been important for paper products to be recycled as environmental considerations, that is, it is important to add a large amount of waste paper pulp, and demands from users have increased.
古紙パルプを配合した葉書に関して、特定の填料を使用又は使用するパルプの離解フリーネスに着目した技術が開示されている（例えば、特許文献３又は特許文献４を参照。）。 With respect to postcards containing waste paper pulp, a technique that focuses on the disaggregation freeness of pulp using or using a specific filler is disclosed (for example, see Patent Document 3 or Patent Document 4).
さらに、多層抄きインクジェット用紙とした技術も開示されている（例えば、特許文献５又は特許文献６を参照。）。 Furthermore, a technique for forming a multi-layer inkjet paper is also disclosed (see, for example, Patent Document 5 or Patent Document 6).
古紙パルプの配合割合を高くしたとき、次のような弊害が発生する。
１．リサイクルが進むと繊維の角質化、短繊維化などの影響によって、各種強度（例えば、紙力、内部結合強さ、引張強さ、引裂強さ、破裂強さなど）の低下、及び、透気抵抗度の上昇が起こること。
２．古紙処理工程で使用する脱墨剤などの界面活性剤が残留するため、基紙が剥き出しである宛名面に印字したときにはフェザリングが発生すること（フェザリングとは、非特許文献１に記載のとおり、いわゆるインク受容層を特別に設けない紙基材表面での滲みを表現するものである。）。宛名面の水性ペンの筆記性も同様に悪化すること。
３．また、プロセス印刷において、印刷面に脱墨剤などの界面活性剤が残留すると、印刷時に湿し水を吸水しやすくなり、結果として紙からの溶出などによって湿し水が汚れやすくなり、印刷版の持ちが悪くなること。
４．インク受容層を設ける場合にも、塗工液の浸透ムラが発生しやすくなる。結果としてインク受容層表面での滲みが発生すること。
When the ratio of waste paper pulp is increased, the following adverse effects occur.
1. As recycling progresses, various strengths (for example, paper strength, internal bond strength, tensile strength, tear strength, burst strength, etc.) decrease due to the effects of keratinization and shortening of fibers, and air permeability An increase in resistance occurs.
2. Surfactant such as deinking agent used in the used paper processing process remains, so that feathering occurs when the base paper is printed on the exposed address surface (feathering is described in Non-Patent Document 1). As described above, it represents bleeding on the surface of a paper base material in which a so-called ink receiving layer is not particularly provided. The writing ability of the water-based pen on the address side will also deteriorate.
3. Also, in process printing, if a surfactant such as a deinking agent remains on the printing surface, it will be easier to absorb dampening water during printing, and as a result, the dampening water will become dirty due to elution from the paper. The life of the
4). Even when the ink receiving layer is provided, uneven penetration of the coating liquid tends to occur. As a result, bleeding on the surface of the ink receiving layer occurs.
印刷強度を上げる対策として、表面強さを高くする方法があり、その手段として被覆性の高いポリビニルアルコール等の塗布が挙げられる。しかし、透気抵抗度が上がり、インクジェット用インクの吸収が悪くなり滲みが大きくなる。 As a measure for increasing the printing strength, there is a method of increasing the surface strength. As a means for this, there is an application of polyvinyl alcohol or the like having a high covering property. However, the air resistance is increased, and the ink for ink jet is poorly absorbed and bleeding is increased.
基紙内の強度を上げる対策として、パルプの叩解を進め、強度を向上させる方法もあるが、基紙が緻密になるため、同様に透気抵抗度がインクジェット用インクの吸収が悪くなり、滲みが大きくなる。 As a measure to increase the strength in the base paper, there is also a method to improve the strength by promoting beating of the pulp. However, since the base paper becomes dense, the air permeability resistance similarly deteriorates the absorption of the ink for ink jet and causes bleeding. Becomes larger.
透気抵抗度を下げる方策として、表面に塗布している澱粉やポリビニルアルコール等の量を制限する、又はパルプの叩解を緩める方法があるが、前述の印刷強度を上げる対策及び基紙内の強度を上げる対策と相反することとなり、不具合となる。 As a measure to reduce the air resistance, there are methods to limit the amount of starch and polyvinyl alcohol applied to the surface, or to loosen the beating of the pulp. This is inconsistent with the measures to raise the value, which becomes a problem.
印刷版の持ちを向上させる対策として、印刷面からの溶出を減らす方法があり、その手段として印刷面のサイズ性を上げる方法が挙げられる。しかし、古紙パルプ中の残留脱墨剤によって効果が出ない。 As a countermeasure for improving the holding of the printing plate, there is a method of reducing elution from the printing surface, and a method of increasing the size property of the printing surface is mentioned as the means. However, there is no effect due to the residual deinking agent in the waste paper pulp.
葉書の宛名面のフェザリング対策として、基紙を製造するときに内添サイズ剤や表面サイズ剤を使用して対応するが、古紙パルプ中の残留脱墨剤、残留灰分によって効果が出ない。宛名面の水性ペンの筆記性も同様に改善しない。 As a countermeasure against feathering on the address of the postcard, an internal sizing agent or a surface sizing agent is used when manufacturing the base paper, but the effect is not exhibited by the residual deinking agent and residual ash in the waste paper pulp. Similarly, the writing performance of the addressable water-based pen is not improved.
インク受容層を設ける場合にも、塗工液の浸透ムラ対策として、基紙を製造するときに内添サイズ剤及び／又は表面サイズ剤を使用して対応するが、古紙パルプ中の残留脱墨剤、残留灰分によって効果が出ない。結果としてインク受容層表面での滲みが発生する。 Even when an ink receiving layer is provided, as a measure against uneven penetration of the coating liquid, an internal sizing agent and / or a surface sizing agent is used when manufacturing the base paper. Ineffective due to chemicals and residual ash. As a result, bleeding on the surface of the ink receiving layer occurs.
最近では、インクジェットプリンターの普及及び高解像度化に伴い、いわゆる通信面側には写真ライクな高精細な画像が望まれている。 Recently, with the widespread use of inkjet printers and higher resolution, photographic-like high-definition images are desired on the so-called communication side.
前述したように、葉書に要求される特性は多岐にわたり、従来技術ではこれらの特性を十分に満足させるまでには至っていなかった。 As described above, the characteristics required for postcards are diverse, and the prior art has not yet fully satisfied these characteristics.
特許文献３又は特許文献４に記載されている特定の填料を使用又は使用するパルプの離解フリーネスに着目した技術では、非塗工面の耐刷力に乏しく事実上印刷をすることはできない。 With the technology focused on the disaggregation freeness of the pulp using or using the specific filler described in Patent Document 3 or Patent Document 4, the printing strength of the non-coated surface is poor and printing cannot be performed in practice.
さらに、特許文献５又は特許文献６に記載された多層抄きインクジェット用紙は、古紙パルプの配合については触れておらず、この製造方法では前記特性を十分に満足させるという課題を解決することができない。 Furthermore, the multilayer paper-jet ink-jet paper described in Patent Document 5 or Patent Document 6 does not touch on the composition of waste paper pulp, and this manufacturing method cannot solve the problem of sufficiently satisfying the above characteristics. .
したがって、本発明は、このような従来の技術がもっていた問題を解決しようとするものであり、古紙パルプ配合のインクジェット記録用葉書に関し、インクジェットプリンター印字で滲みがなく、宛名面における水性ペンでの筆記性に優れ、更には版持ちなどのプロセス印刷による印刷適性が良好なインクジェット用葉書用紙を提供することを目的とする。 Therefore, the present invention is intended to solve the problems of the conventional technology, and relates to an ink jet recording postcard containing waste paper pulp. An object of the present invention is to provide an ink-jet postcard paper that is excellent in writability and has good printability by process printing such as plate holding.
本発明者らは鋭意検討の結果、基紙全体の古紙パルプ配合割合が２０質量％以上であるインクジェット用葉書用紙において、該基紙中の残存界面活性剤の含有率を一定以下とし、かつ片面塗工品の透気抵抗度を２００秒以下とすることをすることで、インクジェットプリンター印字後の滲みがなく、宛名面における水性ペンでの筆記性に優れ、更には版持ちなどのプロセス印刷による印刷適性が良好なインクジェット用葉書用紙を完成するに至った。具体的には、本発明に係るインクジェット用葉書用紙は、３層以上の多層抄きの基紙の片面側に顔料を主体として含有するインク受容層を設け、前記基紙の反対面側にはインク受容層を設けずに基紙を剥き出しの状態とし、かつ、前記基紙全体の古紙パルプ配合割合が２０質量％以上であり、前記基紙の片面だけにインク受容層を設けた片面塗工品の坪量（ＪＩＳ Ｐ ８１２４：１９９８（紙及び板紙−坪量測定方法））が１５０〜２５０ｇ／ｍ２である多層抄きインクジェット用葉書用紙において、
前記基紙の層のうち、前記インク受容層と接する層を表面層、反対側の層を裏面層、該表面層と該裏面層との中間に位置する層を中間層とそれぞれ表記したとき、該中間層が１層以上で形成され、かつ、
１）前記片面塗工品の裏面層中に残存する界面活性剤の含有率が５００ｐｐｍ以下、
２）前記片面塗工品の透気抵抗度（ＪＩＳ Ｐ ８１１７：１９９８（紙及び板紙−透気度試験方法−ガーレー試験機法））が２００秒以下、
であることを特徴とする。なお、ここに示す残存する界面活性剤の含有率は、裏面層の質量に対する質量百万分率である。以下、ｐｐｍで表記しているものについては同様の解釈とする。
As a result of intensive studies, the present inventors have determined that the residual surfactant content in the base paper is not more than a certain level in the ink jet postcard paper in which the ratio of waste paper pulp in the whole base paper is 20% by mass or more, and one side By setting the air resistance of the coated product to 200 seconds or less, there is no bleeding after printing with an inkjet printer, excellent writing performance with a water-based pen on the address side, and further by process printing such as plate holding We have completed inkjet postcard paper with good printability. Specifically, the postcard paper for ink jet according to the present invention is provided with an ink receiving layer mainly containing a pigment on one side of a three or more layers base paper, and on the opposite side of the base paper. Single-sided coating in which the base paper is stripped without providing an ink receiving layer, and the ratio of waste paper pulp in the whole base paper is 20% by mass or more, and an ink receiving layer is provided only on one side of the base paper In a multi-layer inkjet postcard paper having a basis weight (JIS P 8124: 1998 (paper and paperboard—basis weight measurement method)) of 150 to 250 g / m 2 ,
Among the layers of the base paper, when the layer in contact with the ink receiving layer is represented as a surface layer, the opposite layer is represented as a back layer, and the layer located between the surface layer and the back layer is represented as an intermediate layer, The intermediate layer is formed of one or more layers, and
1) The content of the surfactant remaining in the back surface layer of the one-side coated product is 500 ppm or less,
2) Air permeability resistance (JIS P 8117: 1998 (paper and paperboard-air permeability test method-Gurley test machine method)) of the one-side coated product is 200 seconds or less,
It is characterized by being. In addition, the content rate of the surface-active agent which remains here is the mass parts per million with respect to the mass of a back surface layer. Hereinafter, the same notation is used for those expressed in ppm.
本発明に係るインクジェット用葉書用紙では、前記片面塗工品の表面層中に残存する界面活性剤の含有率が１０００ｐｐｍ以下であることが好ましい。 In the inkjet postcard paper according to the present invention, the content of the surfactant remaining in the surface layer of the one-side coated product is preferably 1000 ppm or less.
本発明に係るインクジェット用葉書用紙では、前記基紙の透気抵抗度が６０秒以下であることが好ましい。 In the inkjet postcard paper according to the present invention, the air resistance of the base paper is preferably 60 seconds or less.
本発明に係るインクジェット記録用葉書は、前記の構成をとることによって、基紙全体の古紙パルプ配合割合を２０質量％以上にした場合においてもインクジェットプリンター印字後の滲みがなく、宛名面における水性ペンでの筆記性に優れ、更には版持ちなどのプロセス印刷による印刷適性を有する。 The ink jet recording postcard according to the present invention has the above-described configuration, so that there is no bleeding after printing with an ink jet printer even when the ratio of waste paper pulp in the entire base paper is 20% by mass or more. In addition, it has excellent printability in printing, and further has printability by process printing such as plate holding.
以下本発明について実施形態を示して詳細に説明するが、本発明はこれらの記載に限定して解釈されない。本発明の効果を奏する限り、実施形態は種々の変形をしてもよい。 Hereinafter, the present invention will be described in detail with reference to embodiments, but the present invention is not construed as being limited to these descriptions. As long as the effect of the present invention is exhibited, the embodiment may be variously modified.
本実施形態に係るインクジェット用葉書用紙は、基紙の片面側に顔料を主体として含有するインク受容層を設け、基紙の反対面側にはインク受容層を設けずに基紙を剥き出しの状態としている。そして、基紙は、（ａ）３層以上の多層抄きであり、（ｂ）基紙全体の古紙パルプ配合割合が２０質量％以上であり、（ｃ）インク受容層と接する層を表面層、反対側の層を裏面層、表面層と裏面層との中間に位置する層を中間層とした場合、中間層を１層以上有し、（ｄ）基紙の片面だけにインク受容層を設けた片面塗工品（以下、片面塗工品という）の坪量（ＪＩＳ Ｐ ８１２４：１９９８）は１５０〜２５０ｇ／ｍ２である。そして、
１）片面塗工品の裏面層中に残存する界面活性剤の含有率が５００ｐｐｍ以下、
２）片面塗工品の透気抵抗度（ＪＩＳ Ｐ ８１１７：１９９８）が２００秒以下、
である。
The inkjet postcard paper according to this embodiment is provided with an ink receiving layer mainly containing a pigment on one side of the base paper, and the base paper is exposed without providing an ink receiving layer on the opposite side of the base paper. It is said. The base paper is (a) multi-layered paper of three or more layers, (b) the waste paper pulp blending ratio of the whole base paper is 20% by mass or more, and (c) the layer in contact with the ink receiving layer is the surface layer. When the opposite layer is the back layer and the intermediate layer between the front layer and the back layer is the intermediate layer, it has one or more intermediate layers, and (d) the ink receiving layer is provided only on one side of the base paper The basis weight (JIS P 8124: 1998) of the provided single-sided coated product (hereinafter referred to as single-sided coated product) is 150 to 250 g / m 2 . And
1) The content of the surfactant remaining in the back layer of the single-side coated product is 500 ppm or less,
2) The air resistance (JIS P 8117: 1998) of the single-side coated product is 200 seconds or less,
It is.
基紙全体の古紙パルプ配合割合が２０質量％未満であると、古紙を再利用し、リサイクル率を高め環境に配慮するという本発明の目的を達成しにくくなる。基紙全体の古紙パルプ配合割合は、高いほうが環境配慮とすることができる。 When the ratio of the used paper pulp in the entire base paper is less than 20% by mass, it is difficult to achieve the object of the present invention by recycling the used paper and increasing the recycling rate and considering the environment. The higher the proportion of waste paper pulp in the entire base paper, the higher the environmental consideration.
表面層、中間層、裏面層に均一に古紙パルプを配合した場合又は単層抄きの場合には、
古紙パルプに含まれる残留インキや除去しきれないゴミなどの夾雑物は古紙パルプ配合割合に相関して多くなってしまう。さらに、表面層、裏面層への古紙パルプ配合割合が高くなれば、更に人目に触れる夾雑物は増加する。夾雑物が増加すると見た目が悪くなるだけでなく、宛名面となる裏面の場合では、郵便番号が自動区分機で読み取れなくなる、お年玉付き年賀葉書の抽選番号等が読み取れなくなる、更には住所が読み取り難くなるなどの弊害が発生する。そこで、中間層の古紙パルプ配合割合を表面層、裏面層よりも高めることが好ましい。古紙パルプ配合割合を高くした場合には、褪色の弊害を少なくする観点からも、中間層により多くの古紙を配合することが好ましい。また、古紙パルプを含ませたときに増加する蛍光によるバーコード読み取りの不良の問題を生じさせないためには、より内側である中間層に古紙パルプを使用することが好ましい。
When the waste paper pulp is blended uniformly in the surface layer, intermediate layer, and back layer, or in the case of single-layer papermaking,
Contaminants such as residual ink contained in the waste paper pulp and dust that cannot be removed increase in proportion to the proportion of the waste paper pulp. Furthermore, if the ratio of the used paper pulp to the front surface layer and the back surface layer increases, the amount of foreign matter that can be seen by the human eye increases. Not only does the appearance worsen when the number of foreign objects increases, but in the case of the back side, the postal code cannot be read by the automatic sorting machine, the lottery number of the New Year's card with New Year's cards cannot be read, and the address is difficult to read. The bad effect of becoming will occur. Therefore, it is preferable to increase the proportion of the used paper pulp in the intermediate layer higher than that of the front surface layer and the back surface layer. When the ratio of waste paper pulp is increased, it is preferable to add more waste paper to the intermediate layer from the viewpoint of reducing the adverse effects of discoloration. Further, in order not to cause the problem of poor barcode reading due to the fluorescence that increases when the used paper pulp is included, it is preferable to use the used paper pulp for the intermediate layer which is further inside.
なお、古紙パルプ配合割合は、数１によって算出する。
（数１）古紙パルプ配合割合（％）＝古紙パルプ配合量÷（バージンパルプ配合量＋古紙パルプ配合量）×１００
In addition, a waste paper pulp mixing | blending ratio is calculated by Formula 1.
(Equation 1) Used paper pulp blending ratio (%) = used paper pulp blending amount / (virgin pulp blending amount + used paper pulp blending amount) × 100
また、生産時には自己回流損紙が発生するが、この自己回流損紙を使用しても支障は無い。ただし、自己回流損紙は、古紙パルプ配合量に含めないにもかかわらず古紙パルプを実質含むため、基紙の表裏に出ないように中間層で使用することが好ましい。さらには、オンマシンでインク受容層を塗工する場合は、インク受容層塗設済みの自己回流損紙を使用するので、プレスパート及びドライヤー汚れを軽減するために中間層で使用することがより好ましくなる。以上のことから単層抄きの場合は、夾雑物の面だけでなく抄紙機上の工程汚れの面でも不利となる。 In addition, self-flowing waste paper is generated during production, but there is no problem even if this self-flowing waste paper is used. However, since the self-circulating waste paper substantially contains waste paper pulp even though it is not included in the amount of waste paper pulp, it is preferably used in the intermediate layer so as not to appear on the front and back of the base paper. Furthermore, when the ink-receiving layer is applied on-machine, self-rotating paper with an ink-receiving layer is used, so it is better to use it in the intermediate layer to reduce press part and dryer stains. It becomes preferable. From the above, in the case of single layer papermaking, it is disadvantageous not only in terms of impurities but also in terms of process contamination on the paper machine.
表面層、中間層、裏面層に均一に古紙パルプを配合した場合又は単層抄きの場合には、印刷強度は古紙パルプ配合割合に相関して低下してしまう。さらに、裏面層への古紙パルプ配合割合が高くなれば、更に印刷強度は低下する。印刷強度が低下すると、紙剥け、ピッキングなどの品質上の問題だけでなく、ブランケットへのパイリング等も発生し印刷作業性にも支障を来たす。 When recycled paper pulp is blended uniformly in the surface layer, intermediate layer, and back layer, or in the case of single-layer papermaking, the printing strength decreases in correlation with the recycled paper pulp blending ratio. Furthermore, if the proportion of waste paper pulp in the back layer increases, the printing strength further decreases. When the printing strength is reduced, not only quality problems such as paper peeling and picking but also piling on a blanket, etc. occur, which hinders printing workability.
中間層だけに古紙パルプを配合することによって、所望の、基紙全体に対する古紙パルプ配合割合を達成することができる場合には、表面層及び裏面層には、古紙パルプを配合せずともよい。 When the desired ratio of the used paper pulp to the entire base paper can be achieved by adding the used paper pulp only to the intermediate layer, it is not necessary to add the used paper pulp to the front surface layer and the back surface layer.
基紙に用いる古紙パルプは、大きく上質系、中質系に分けられるが、褪色を避けるために上質系古紙パルプが好ましい。上質系古紙パルプとしては、上白・罫白・カード・模造・色上・ケント・白アート・ミルクカートンなどの古紙から調製されたパルプが挙げられる。 Waste paper pulp used for the base paper is largely classified into high-quality and medium-quality paper, but high-quality waste paper pulp is preferable in order to avoid discoloration. Examples of the high-quality waste paper pulp include pulps prepared from waste paper such as fine white, ruled white, curd, imitation, color, Kent, white art, and milk carton.
古紙処理工程には離解、除塵処理、脱墨、漂白、分散、洗浄などの各工程を持つが脱墨剤は離解時、脱墨工程前、漂白前に使用する。脱墨剤は、ポリオキシエチレンアルキルフェニルエーテル、ポリオキシエチレンアルキルエーテル等のノニオン系界面活性剤系脱墨剤の他、脂肪酸系脱墨剤、脂肪酸のポリアルキレンオキシド誘導体、高級アルコールのポリアルキレンオキシド誘導体、油脂のポリアルキレンオキシド誘導体系脱墨剤等が使用される。 The used paper processing process has processes such as disaggregation, dust removal, deinking, bleaching, dispersion, and washing. The deinking agent is used at the time of disaggregation, before the deinking process, and before bleaching. Deinking agents include nonionic surfactant deinking agents such as polyoxyethylene alkylphenyl ether and polyoxyethylene alkyl ether, fatty acid deinking agents, polyalkylene oxide derivatives of fatty acids, polyalkylene oxides of higher alcohols. Derivatives, oil and fat polyalkylene oxide derivative deinking agents and the like are used.
本発明に使用される古紙パルプは、分散処理、洗浄処理を有する古紙処理工程で処理されたものを使用することが好ましい。その他に除塵、脱墨、漂白などの各処理工程を有していることがより好ましい。 The waste paper pulp used in the present invention is preferably one that has been treated in a waste paper treatment process having a dispersion treatment and a washing treatment. It is more preferable to have other processing steps such as dust removal, deinking, and bleaching.
洗浄効果を向上させるために洗浄工程の前に分散処理を行い、このことによって微細繊維を除去し、基紙の透気性を向上させ、更には脱墨剤の残留を軽減し、インクジェット印字適性を好適とする。また、不要灰分を除去することによって印刷適性を好適とする。 In order to improve the cleaning effect, a dispersion treatment is performed before the cleaning process, thereby removing fine fibers, improving the air permeability of the base paper, and further reducing the residual of the deinking agent, thereby improving ink jet printing suitability. It is preferable. Moreover, the printability is made suitable by removing unnecessary ash.
多層抄きの場合、抄き合わせ後にプレスパートで加圧脱水するときに、古紙パルプが中間層だけに配合した場合でも、界面活性剤、微細なインク及び灰分は、表面層及び／又は裏面層へ層を越えて移動することがある。したがって、古紙処理工程には界面活性剤、微細なインク及び灰分を除去できる洗浄装置を設置し、当該装置による洗浄工程を経ることが好ましい。さらには洗浄工程が２回以上あることがより好ましい。ただし、洗浄工程が４回以上になると洗浄による効果が頭打ちとなり、歩留まりやランニングコストの面から不利になることが多くなるため、注意が必要である。 In the case of multi-layer papermaking, even when waste paper pulp is blended only in the intermediate layer when pressure dewatering is performed in the press part after papermaking, the surface active agent and / or the fine ink and ash are present in the surface layer and / or the back surface layer. May move across the layer. Therefore, it is preferable to install a cleaning device capable of removing the surfactant, fine ink, and ash in the used paper processing step, and go through a cleaning step by the device. Furthermore, it is more preferable that there are two or more washing steps. However, it should be noted that if the cleaning process is performed four times or more, the effect of the cleaning reaches its peak, which is often disadvantageous in terms of yield and running cost.
ここで用いる分散処理としては、低速・高濃度用軸タイプの分散機又はディスクタイプの分散機が適している。低速・高濃度用軸タイプの分散機としては、一軸型又は二軸型のニーダータイプのディスパーザーが好ましい。軸状のローターに取り付けられた回転刃と、ケーシングに取り付けられた固定刃とを有し、回転数５０〜３００ｒｐｍの低速で、パルプ濃度％を２０％〜５０％（以下、パルプ濃度％は、質量％を意味する。）の高濃度、好ましくは、２５％〜４０％で処理する。パルプ濃度％が２０％未満では、機械的負荷がかかりにくく、コート紙系古紙中の塗工層の分散性が低下するため、次工程の洗浄処理で不要灰分を除去することができない。また、パルプ濃度％が５０％を超えて高濃度にすると機械的に搾水するのは困難である。 As the dispersion processing used here, a low-speed / high-concentration shaft-type disperser or a disk-type disperser is suitable. As the low-speed / high-concentration shaft type disperser, a uniaxial or biaxial kneader type disperser is preferable. It has a rotary blade attached to a shaft-shaped rotor and a fixed blade attached to a casing, and at a low speed of 50 to 300 rpm, the pulp concentration% is 20% to 50% (hereinafter, pulp concentration% is High concentration), preferably 25% to 40%. When the pulp concentration% is less than 20%, it is difficult to apply a mechanical load, and the dispersibility of the coating layer in the coated paper-based waste paper is lowered. Therefore, unnecessary ash cannot be removed by the washing process in the next step. Further, when the pulp concentration% exceeds 50% and is high, it is difficult to squeeze water mechanically.
一般的には、一軸型ニーダーとして、ニーディング・ディスパージャーＫＤ（商品名：アイ・エイチ・アイ フォイト ペーパーテクノロジー社製）、ディスパーザー（商品名：相川鉄工社製）、ディスパーザー（商品名：アセック社製）、ディスパーザー（商品名：三栄レギュレーター社製）、ＣＣＥ型ニーディングマシン（商品名：新浜ポンプ製作所社製）、ニーダー（商品名：山本百馬製作所社製）などが使用され、又、二軸型ニーダーとして、新浜ポンプ製作所社製、山本百馬製作所社製のものなどが使用されるが、特定の機種に限定するものではない。 In general, as a single-shaft kneader, kneading disperser KD (trade name: manufactured by IH IFOIT Paper Technology), disperser (trade name: manufactured by Aikawa Tekko), disperser (trade name: ASEC), disperser (trade name: manufactured by Sanei Regulator Co., Ltd.), CCE type kneading machine (trade name: manufactured by Niihama Pump Manufacturing Co., Ltd.), kneader (product name: manufactured by Yamamoto Hyakuma Manufacturing Co., Ltd.) Further, as the biaxial kneader, those manufactured by Niihama Pump Mfg. Co., Ltd. and Yamamoto Hyakuma Mfg. Co., Ltd. are used, but are not limited to specific models.
また、ディスクタイプの分散機とは、ディスク型ディスパーザー又はコニカル型ディスパーザーであれば特に制限はない。構造的にはディスクリファイナーと似ているが、ディスクプレートの構造が異なっている。また、コニカル型ディスパーザーは、回転刃がコニカル状になっている。回転数３００ｒｐｍ〜２５００ｒｐｍ、パルプ濃度％を２０％以上として処理する。軸タイプの分散機と異なる点は、繊維と刃の衝突作用が主体となってインキ剥離・ダートの分散が起こる点である。一般的には、ディスク型ディスパーザーとして、ディスパージャーＨＴＤ（商品名：アイ・エイチ・アイ フォイト ペーパーテクノロジー社製）、ＫＲＩＭＡホットディスパージョン設備（商品名：Ｃｅｌｌｗｏｏｄ社製）などが使用され、また、コニカル型ディスパーザーとして、コニディスク（商品名：相川鉄工社製）、コニカルディスパージョンシステム／ＨＩプリヒーター／ＯｐｔｉＦｉｎｅｒディスパーザー（商品名：メッツォ ＳＨＩ社製）などが使用されるが、特定の機種に限定するものではない。 Further, the disk type disperser is not particularly limited as long as it is a disk type disperser or a conical type disperser. Structurally similar to a disc refiner, but the disc plate has a different structure. Further, the conical type disperser has a rotating blade in a conical shape. Processing is performed at a rotation speed of 300 rpm to 2500 rpm and a pulp concentration% of 20% or more. The difference from the shaft type disperser is that the ink and the dirt are dispersed mainly by the collision action of the fiber and the blade. In general, as a disk-type disperser, a disperser HTD (trade name: manufactured by IH / IFOIT Paper Technology), a KRIMA hot dispersion facility (trade name: manufactured by Cellwood), etc. are used. As conical type dispersers, conical discs (trade name: manufactured by Aikawa Tekko Co., Ltd.), conical dispersion systems / HI pre-heaters / Optifiner dispersers (product name: manufactured by Metso SHI), etc. are used. It is not limited.
ここで用いる洗浄処理としては、２連エキストラクター、３連エキストラクター、ディスクシックナー、バルブレスフィルター、フォールウォッシャー（栄工機社製）、ＤＮＴウォッシャー（相川鉄工社製）等があるが特定の機種に限定するものではない。 The cleaning process used here includes double extractor, triple extractor, disc thickener, valveless filter, fall washer (Eiko), DNT washer (Aikawa Tekko), etc. It is not limited.
中質系古紙パルプの代表として、新聞、雑誌、切付、中質反古、茶模造、段ボール、台紙・地券、ボール紙などから調製されるパルプが挙げられる。なお、褪色性の観点から、全古紙パルプ中の中質系古紙パルプの割合を２０質量％以下とすることが好ましく、１０質量％以下とすることがより好ましい。 Representative examples of the medium-sized waste paper pulp include pulps prepared from newspapers, magazines, cutting, medium-size antiquarian, tea imitation, corrugated cardboard, backing paper / base cards, cardboard and the like. In addition, from the viewpoint of fading properties, the ratio of medium-sized waste paper pulp in all waste paper pulp is preferably 20% by mass or less, and more preferably 10% by mass or less.
基紙に用いるパルプとしては、古紙パルプの他に、バージンパルプとして広葉樹漂白クラフトパルプ（ＬＢＫＰ）が好ましい。所望する品質が損なわれない程度に針葉樹漂白クラフトパルプ（ＮＢＫＰ）、広葉樹漂白サルファイトパルプ（ＬＢＳＰ）、針葉樹漂白サルファイトパルプ（ＮＢＳＰ）、機械パルプ（ＧＰ、ＴＭＰ、ＢＣＴＭＰ）や必要に応じて、木材パルプ以外に、非木材パルプ、合成パルプ、合成繊維などを適宜用いてもよいが、褪色性、インクジェット適性及びコストの観点から、その量は２０質量％以下が好ましく、１０質量％以下がより好ましい。 The pulp used for the base paper is preferably hardwood bleached kraft pulp (LBKP) as virgin pulp in addition to waste paper pulp. To the extent that the desired quality is not impaired, softwood bleached kraft pulp (NBKP), hardwood bleached sulfite pulp (LBSP), softwood bleached sulfite pulp (NBSP), mechanical pulp (GP, TMP, BCTMP) and as required, In addition to wood pulp, non-wood pulp, synthetic pulp, synthetic fiber, and the like may be used as appropriate. However, in terms of fading, inkjet suitability, and cost, the amount is preferably 20% by mass or less, and more preferably 10% by mass or less. preferable.
基紙に広葉樹漂白クラフトパルプ（ＬＢＫＰ）を用いるが、一旦濃縮した後、離解及び叩解を行い、基紙の原料として使用することが好ましい。固形分濃度として２０質量％から７０質量％の範囲に一旦濃縮することが好ましく、３０質量％から６０質量％の範囲がより好ましい。２０質量％未満であるとパルプ中の不要成分、微細繊維等の除去が不十分となり、基紙の透気性が低下しインクジェット印字適性が不適となる。７０質量％を超えることは、機械的に搾水するのが困難である。なお、運搬などの都合よって脱水濃縮後に加熱乾燥等の処理を行うことがあるが、パルプの角質化の進行やパルプ自体が剛直となり、非塗工面の耐刷力に悪影響を及ぼすため、８０質量％を超えるまでの加熱乾燥は行わない。 Hardwood bleached kraft pulp (LBKP) is used for the base paper, but it is preferable to use it as a raw material for the base paper after being concentrated and then disaggregated and beaten. It is preferable to once concentrate in the range of 20 mass% to 70 mass% as solid content concentration, and the range of 30 mass% to 60 mass% is more preferable. If it is less than 20% by mass, removal of unnecessary components, fine fibers and the like in the pulp becomes insufficient, the air permeability of the base paper is lowered, and ink jet printing suitability becomes unsuitable. Exceeding 70% by mass is difficult to mechanically squeeze water. In some cases, heat drying may be performed after dehydration and concentration for convenience of transportation, etc., but the progress of keratinization of the pulp and the pulp itself become rigid, which adversely affects the printing durability of the non-coated surface. Do not heat-dry until more than%.
ここで用いる濃縮機としては、ダブルワイヤーシックナー、スクリュープレス、ツインドラムプレスなどがあるが、バルブレスフィルターの様に洗浄効果が少なく、かつ、高濃度に濃縮できない機種は適さない。濃縮したパルプを移動・運搬を要する場合は、ダブルワイヤーシックナーを用いるとシート状となり、かつ、高濃度に濃縮可能なため、好ましい。 As the concentrator used here, there are a double wire thickener, a screw press, a twin drum press, and the like, but a model that has a small cleaning effect and cannot be concentrated at a high concentration, such as a valveless filter, is not suitable. When moving and transporting the concentrated pulp, it is preferable to use a double wire thickener because it becomes a sheet and can be concentrated to a high concentration.
本実施形態においては、基紙に填料を添加してもよい。具体的には、水和珪酸、ホワイトカーボン、タルク、カオリン、クレー、炭酸カルシウム、酸化チタン、アルミノケイ酸塩、焼成クレー、合成樹脂填料などの公知の填料を併用することができる。 In the present embodiment, a filler may be added to the base paper. Specifically, known fillers such as hydrated silicic acid, white carbon, talc, kaolin, clay, calcium carbonate, titanium oxide, aluminosilicate, calcined clay, and synthetic resin filler can be used in combination.
所定のフリーネスに叩解されたパルプスラリーは、長網抄紙機、ツインワイヤー抄紙機又は円網抄紙機によって３層以上の多層で抄紙される。これらの抄紙機のコンビーネーションでもかまわない。この場合、必要に応じて分散助剤、乾燥紙力増強剤、サイズ剤、定着剤、ｐＨ調節剤、染料、有色顔料、蛍光増白剤なども適宜添加することが可能である。ここで叩解方法は、バージンパルプと古紙パルプとを混合してから叩解するいわゆる混合叩解を行う方法、又はバージンパルプと古紙パルプとを別々に叩解するいわゆる単独叩解を行ってから混合する方法でもどちらでもよい。 The pulp slurry beaten to a predetermined freeness is made into a multilayer of 3 or more layers by a long net paper machine, a twin wire paper machine or a circular net paper machine. A combination of these paper machines is also acceptable. In this case, a dispersion aid, a dry paper strength enhancer, a sizing agent, a fixing agent, a pH adjuster, a dye, a colored pigment, a fluorescent brightening agent, and the like can be appropriately added as necessary. Here, the beating method may be either a so-called mixed beating method in which virgin pulp and waste paper pulp are mixed and then be beaten, or a so-called single beating method in which virgin pulp and waste paper pulp are separately beaten and then mixed. But you can.
表面層、中間層、裏面層を設けた３層以上の多層で抄紙されるが、各層の坪量は均等である必要はなく、例えば中間層の坪量を、表面層の坪量及び裏面層の坪量よりも相対的に大きくすることも可能である。さらに、表面層及び裏面層を各１層とし中間層を２層以上にすることも可能である。 Paper is made with three or more layers provided with a surface layer, an intermediate layer, and a back layer, but the basis weight of each layer does not need to be uniform. For example, the basis weight of the intermediate layer is the same as the basis weight of the surface layer and the back layer. It is also possible to make it relatively larger than the basis weight. Furthermore, it is possible to make the front layer and the back layer one layer each and the intermediate layer to be two layers or more.
本実施形態に係るインクジェット用葉書用紙では、片面塗工品の坪量（ＪＩＳ Ｐ ８１２４：１９９８）を１５０〜２５０ｇ／ｍ２とする。通常の郵便葉書の坪量が１８０〜２００ｇ／ｍ２であるため、当該坪量の範囲を含む、片面塗工品の坪量１５０〜２５０ｇ／ｍ２を前提とした透気抵抗度を求めることとしている。 In the postcard paper for inkjet which concerns on this embodiment, the basic weight (JIS P 8124: 1998) of a single-sided coated product shall be 150-250 g / m < 2 >. Since the basis weight of a normal postcard is 180 to 200 g / m 2 , the air resistance is determined based on the basis weight of 150 to 250 g / m 2 for a single-side coated product including the basis weight range. It is said.
本実施形態では、前記のようにして多層抄き合せによって抄造された基紙の表面に必要に応じてサイズ液を塗布してもよい。基紙の表面としては、インク受容層を設ける予定の面又は及びその裏面である。具体的には、酸化澱粉、自家変成澱粉、尿素リン酸化澱粉、ポリアクリルアマイド、ポリビニルアルコールなどの表面サイズ剤、ｐＨ調節剤、染料、有色顔料、蛍光増白剤などの公知の資材を使用することができる。 In the present embodiment, a sizing liquid may be applied to the surface of the base paper made by multi-layer paper making as described above, if necessary. The surface of the base paper is the surface on which the ink receiving layer is to be provided or the back surface thereof. Specifically, known materials such as surface sizing agents such as oxidized starch, self-modified starch, urea-phosphorylated starch, polyacrylamide, and polyvinyl alcohol, pH adjusters, dyes, colored pigments, and fluorescent brighteners are used. be able to.
サイズ液の塗布方式としては、コンベンショナルサイズプレス、ゲートロールサイズプレス、フィルムトランスファー方式のサイズプレス、エアナイフコーター、ロッドコーターなどを用いることができる。 As a method of applying the size liquid, a conventional size press, a gate roll size press, a film transfer type size press, an air knife coater, a rod coater, or the like can be used.
また、必要に応じてフィルムトランスファー方式のサイズプレス、エアナイフコーター、ロッドコーターなどを用いて裏面（宛名面側）だけの塗布としてもよい。 Moreover, it is good also as application | coating only on the back surface (address side) using a film transfer type size press, an air knife coater, a rod coater, etc. as needed.
このようにして製造した基紙（紙支持体）に直接にインク受容層を設けてもよいが、予め基紙表面を平滑化する目的で、マシンカレンダー、ソフトカレンダー、熱キャレンダー、ラスタープレスなどの処理を施すことが好ましい。 The ink receiving layer may be provided directly on the base paper (paper support) produced in this way, but for the purpose of smoothing the surface of the base paper in advance, a machine calendar, soft calendar, thermal calendar, raster press, etc. It is preferable to perform the process.
インク受容層に用いる顔料としては、合成非晶質シリカ、コロイダルシリカ、コロイダルアルミナ、擬ベーマイト、水酸化アルミニウム、アルミナ、リトポン、加水ハロイサイト、炭酸マグネシウム、水酸化マグネシウム、珪酸アルミニウム、ケイソウ土、珪酸カルシウム、珪酸マグネシウム、軽質炭酸カルシウム、重質炭酸カルシウム、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、サチンホワイトなどの白色無機顔料はもちろんのこと、スチレン系プラスチックピグメント、アクリル系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、メラミン樹脂などの有機顔料も使用することができるが、コストと高いインク吸収性の点から、合成非晶質シリカが好ましく用いられる。 As pigments used in the ink receiving layer, synthetic amorphous silica, colloidal silica, colloidal alumina, pseudoboehmite, aluminum hydroxide, alumina, lithopone, hydrous halloysite, magnesium carbonate, magnesium hydroxide, aluminum silicate, diatomaceous earth, calcium silicate , Magnesium Silicate, Light Calcium Carbonate, Heavy Calcium Carbonate, Kaolin, Talc, Calcium Sulfate, Barium Sulfate, Titanium Dioxide, Zinc Oxide, Zinc Sulfide, Zinc Carbonate, Satin White, as well as Styrene Plastic Organic pigments such as pigments, acrylic plastic pigments, polyethylene, microcapsules, urea resins, and melamine resins can also be used, but synthetic amorphous silica is preferred because of its high cost and high ink absorption. Used.
インク受容層には、顔料のほか、次のバインダーを用いる。例えば、ポリビニルアルコール、ポリエチレン酢酸ビニル、変性ポリビニルアルコール、ヒドロキシエチルセルロース、カルボキシメチルセルロース等のセルロース誘導体、ポリアクリルアミド、ポリエチレンオキサイド、ポリプロピレンオキサイド、でんぷん、変性でんぷん、ポリアクリル酸、ポリアクリル酸ソーダ、アルギン酸ソーダ、ポリスチレンスルホン酸ソーダ、カゼイン、ゼラチン、テルペン等の水溶性バインダーなどが挙げられるが、コストとインクジェット適性の点から、ポリビニルアルコール及びポリエチレン酢酸ビニルが好ましく用いられる。 In addition to the pigment, the following binder is used for the ink receiving layer. For example, polyvinyl alcohol, polyethylene vinyl acetate, modified polyvinyl alcohol, cellulose derivatives such as hydroxyethyl cellulose, carboxymethyl cellulose, polyacrylamide, polyethylene oxide, polypropylene oxide, starch, modified starch, polyacrylic acid, sodium polyacrylate, sodium alginate, polystyrene Examples thereof include water-soluble binders such as sodium sulfonate, casein, gelatin, and terpene, and polyvinyl alcohol and polyethylene vinyl acetate are preferably used from the viewpoints of cost and inkjet suitability.
インク受容層には、インクジェットインクの定着性と発色性を向上させるために、カチオン性高分子を主成分とする次のようなインク定着剤を用いる。このようなカチオン性ポリマーとしては、ポリエチレンイミン、エピクロルヒドリン変性ポリアルキルアミン、ポリアミンポリアミドエピクロルヒドリン、ジメチルアミンアンモニアエピクロルヒドリン、ポリビニルベンジルトリメチルアンモニウムハライド、ポリジアクリルジメチルアンモニウムハライド、ポリジメチルアミノエチルメタクリレート塩酸塩、ポリビニルピリジウムハライド、カチオン性ポリアクリルアミド、カチオン性ポリスチレン共重合体、ジアリルジメチルアンモニウムクロライド重合物、ジアリルジメチルアンモニウムクロライド二酸化硫黄共重合物、ジアリルジメチルアンモニウムクロライドアミド共重合物、ジシアンジアミドホルマリン重縮合物、ジシアンジアミドジエチレントリアミン重縮合物、ポリアリルアミン、ポリアリルアミン塩酸塩、ポリアクリルアミド系樹脂、ポリアミドエポキシ樹脂、メラミン樹脂酸コロイド、尿素系樹脂、カチオン変性ＰＶＡ、ベタイン型化合物、その他第４級アンモニウム塩類、ポリアミンなどが用いられる。 In the ink receiving layer, in order to improve the fixability and color developability of the ink-jet ink, the following ink fixer mainly composed of a cationic polymer is used. Examples of such cationic polymers include polyethyleneimine, epichlorohydrin-modified polyalkylamine, polyamine polyamide epichlorohydrin, dimethylamine ammonia epichlorohydrin, polyvinylbenzyltrimethylammonium halide, polydiacryldimethylammonium halide, polydimethylaminoethyl methacrylate hydrochloride, polyvinylpyridium. Halide, cationic polyacrylamide, cationic polystyrene copolymer, diallyldimethylammonium chloride polymer, diallyldimethylammonium chloride sulfur dioxide copolymer, diallyldimethylammonium chloride amide copolymer, dicyandiamide formalin polycondensate, dicyandiamide diethylenetriamine polycondensation , Polyallyl Min, polyallylamine hydrochloride, polyacrylamide resins, polyamide epoxy resins, melamine resins acid colloids, urea-based resins, cation-modified PVA, betaine compounds, other quaternary ammonium salts, polyamine is used.
インク受容層に用いる塗工液には、必要に応じて分散剤、消泡剤、ｐＨ調整剤、湿潤剤、保水剤、増粘剤、架橋剤、離型剤、防腐剤、柔軟剤、ワックス、導電防止剤、帯電防止剤、サイズ剤、耐水化剤、可塑剤、蛍光増白剤、着色顔料、着色染料、還元剤、紫外線吸収剤、酸化防止剤、香料、脱臭剤などを適宜選定して添加することができる。また、例えばシリカスラリーに含有させる、バインダーに含有させるなど、これらを添加する場所、方法についても限定されない。 The coating liquid used for the ink-receiving layer includes a dispersant, an antifoaming agent, a pH adjusting agent, a wetting agent, a water retention agent, a thickening agent, a cross-linking agent, a release agent, an antiseptic, a softening agent, and a wax as necessary. , Antistatic agent, antistatic agent, sizing agent, waterproofing agent, plasticizer, fluorescent whitening agent, coloring pigment, coloring dye, reducing agent, ultraviolet absorber, antioxidant, fragrance, deodorant, etc. Can be added. Further, the place and method of adding these are not limited, for example, in silica slurry or in binder.
インク受容層に関しては、一般の塗工機、例えば、ブレードコーター、ロールコーター、エアナイフコーター、ロッドコーター、リップコーター、カーテンコーター、スプレーコーター、ダイコーター、チャンブレックスコーター、チップブレードコーターなどによってオフマシン又はオンマシンで塗工する。 Regarding the ink receiving layer, it is off-machined by a general coating machine, for example, a blade coater, a roll coater, an air knife coater, a rod coater, a lip coater, a curtain coater, a spray coater, a die coater, a champless coater, a chip blade coater, etc. Apply on-machine.
塗工液は、乾燥塗工量が通信面に４〜１５ｇ／ｍ２、好ましくは５〜１３ｇ／ｍ２の範囲で塗工する。乾燥塗工量が４ｇ／ｍ２未満の場合は、インクジェット印字品質が低下する。乾燥塗工量が１５ｇ／ｍ２を超えるとインクジェットプリンター内で塗工層の脱落などが発生し、印字汚れが発生し、更には宛名面のプロセス印刷による印刷時にも、葉書用紙のエッジ部からの粉落ち原因になる。当然薬品費も掛かるので、コスト面でも不利となる。 The coating liquid is applied so that the dry coating amount is 4 to 15 g / m 2 , preferably 5 to 13 g / m 2 on the communication surface. When the dry coating amount is less than 4 g / m 2 , the ink jet printing quality is deteriorated. If the dry coating amount exceeds 15 g / m 2 , the coating layer may fall off in the ink jet printer, causing printing stains, and even from the edge of the postcard paper during printing by the process printing on the address side. Cause powder fall off. Naturally, since it costs chemicals, it is disadvantageous in terms of cost.
塗工後の乾燥方式としては、熱風乾燥、赤外乾燥、ドラム乾燥等が挙げられるが、本発明においては特に限定されるものではない。 Examples of the drying method after coating include hot air drying, infrared drying, drum drying and the like, but are not particularly limited in the present invention.
また、塗工層の乾燥後に、必要に応じてマシンカレンダー、スーパーカレンダー、ソフトカレンダーなどの処理を行ってもよい。本発明においては、処理方式は特に限定されるものではない。 Moreover, you may process a machine calendar, a super calendar, a soft calendar, etc. as needed after drying of a coating layer. In the present invention, the processing method is not particularly limited.
本実施形態に係るインクジェット用葉書用紙では、片面塗工品の裏面層中に残存する界面活性剤の含有率を５００ｐｐｍ以下とし、３００ｐｐｍ以下とすることが好ましい。片面塗工品の裏面層中に残存する界面活性剤の含有率が５００ｐｐｍを超えると、宛名面にインクジェット印字をした場合フェザリングの発生が有り、又水性ペンでの筆記性が低下し、印刷版の持ちが悪くなる。片面塗工品の裏面層中に残存する界面活性剤の含有率を５００ｐｐｍ以下とする具体的な手段としては、例えば、古紙処理工程で使用する脱墨剤として界面活性剤系の使用を控え、界面活性剤系以外の脱墨剤を使用すること、古紙処理工程において界面活性剤を除去できる洗浄装置を設置し、当該装置による洗浄工程を経ること、更に当該洗浄工程の回数を増やすこと、である。なお、片面塗工品の裏面層中に残存する界面活性剤の含有率の下限としては、１ｐｐｍとすることが好ましい。脱墨効果を得るためには、わずかながらも脱墨剤を添加する必要があり、また、洗浄を強化しすぎると、歩留まり低下を招くためである。また、古紙処理工程での脱墨剤の使用量は、０．０５〜０．４質量％であるが、出来上がり古紙パルプの品質、残留脱墨剤の観点から、添加率を増減することが好ましい。 In the inkjet postcard paper according to the present embodiment, the content of the surfactant remaining in the back layer of the single-side coated product is preferably 500 ppm or less, and preferably 300 ppm or less. If the content of the surfactant remaining in the back layer of the single-sided coated product exceeds 500 ppm, feathering may occur when the ink-jet printing is performed on the addressed surface, and the writing property with a water-based pen decreases. The holding of the plate becomes worse. As a specific means for setting the content of the surfactant remaining in the back layer of the single-side coated product to 500 ppm or less, for example, refrain from using a surfactant system as a deinking agent used in the waste paper processing step, By using a deinking agent other than the surfactant system, installing a cleaning device that can remove the surfactant in the waste paper processing process, going through the cleaning process by the device, and further increasing the number of times the cleaning process is there. In addition, it is preferable to set it as 1 ppm as a minimum of the content rate of surfactant which remains in the back surface layer of a single-side coated product. This is because in order to obtain the deinking effect, it is necessary to add a slight amount of deinking agent, and if the cleaning is strengthened excessively, the yield decreases. The amount of the deinking agent used in the used paper processing step is 0.05 to 0.4% by mass, but it is preferable to increase or decrease the addition rate from the viewpoint of the quality of the finished used paper pulp and the residual deinking agent. .
本実施形態に係るインクジェット用葉書用紙では、片面塗工品の透気抵抗度（ＪＩＳ Ｐ ８１１７：１９９８）を２００秒以下とし、好ましくは１７０秒以下とする。片面塗工品の透気抵抗度が２００秒を超えると、インクジェットインキの浸透が阻害され、結果として、印字品質の悪化につながるという問題がある。片面塗工品の透気抵抗度の下限は、６０秒とすることが好ましい。片面塗工品の透気抵抗度が６０秒未満では、結果として、繊維間結合が弱くなり、実質、プロセス印刷に耐え難いものとなる場合がある。 In the ink jet postcard paper according to the present embodiment, the air resistance (JIS P 8117: 1998) of the single-side coated product is set to 200 seconds or less, and preferably 170 seconds or less. If the air resistance of the single-sided coated product exceeds 200 seconds, there is a problem that the penetration of the ink-jet ink is hindered and as a result, the print quality is deteriorated. The lower limit of the air resistance of the single-side coated product is preferably 60 seconds. If the air resistance of the single-sided coated product is less than 60 seconds, as a result, the bond between fibers becomes weak, and it may be substantially difficult to withstand process printing.
片面塗工品の透気抵抗度を２００秒以下とするために、基紙の透気抵抗度を６０秒以下とすることが好ましく、５０秒以下がより好ましい。基紙の透気抵抗度を６０秒以下とするためには、具体的には、前述したとおりの、古紙パルプの種類を選択し、古紙パルプの処理を行い、古紙パルプの他に使用するパルプの種類を選択し、古紙パルプの他に使用するパルプの処理を行って、基紙に使用することが好ましい。特に、古紙パルプの洗浄効果を向上させるために洗浄工程の前に分散処理を行い、このことによって微細繊維を除去することで基紙の透気性を向上させる手法は好適である。一方、澱粉やポリビニルアルコールなどの基紙に塗布する薬剤の減量、使用するパルプの叩解度を緩めるなどの手段では透気抵抗度は下がっても強度低下が著しく結果的に実使用ができないことになる。基紙の透気抵抗度の下限は、２０秒とすることが好ましい。基紙の透気抵抗度が２０秒未満では、基紙の細孔が大きくなり、その結果、インク受容層を設けるときにバインダーのマイグレーションが顕著となり、塗工層強度が弱くなり、プロセス印刷機での印刷時のブランケット汚れ、インクジェットプリンターでの印字時のインク受容層の剥離などの不具合をきたす場合がある。 In order to make the air resistance of the single-side coated product 200 seconds or less, the air resistance of the base paper is preferably 60 seconds or less, and more preferably 50 seconds or less. In order to set the air resistance of the base paper to 60 seconds or less, specifically, as described above, the type of the used paper pulp is selected, the used paper pulp is processed, and the pulp used in addition to the used paper pulp. It is preferable to select the type of the paper and treat the pulp used in addition to the used paper pulp to use it for the base paper. In particular, a method of improving the air permeability of the base paper by carrying out a dispersion treatment before the washing step in order to improve the washing effect of the used paper pulp and thereby removing fine fibers is preferable. On the other hand, if the amount of chemicals applied to the base paper, such as starch or polyvinyl alcohol, is reduced, or the degree of beating of the pulp to be used is reduced, the air permeability resistance will decrease, but the strength will decrease significantly, resulting in impractical use. Become. The lower limit of the air resistance of the base paper is preferably 20 seconds. When the air resistance of the base paper is less than 20 seconds, the pores of the base paper become large. As a result, when the ink receiving layer is provided, binder migration becomes remarkable, and the coating layer strength is weakened. In some cases, there are problems such as blanket smearing during printing with the ink and peeling of the ink receiving layer during printing with the ink jet printer.
本実施形態に係るインクジェット用葉書用紙では、片面塗工品の表面層中に残存する界面活性剤の含有率が１０００ｐｐｍ以下であることが好ましく、７００ｐｐｍ以下がより好ましい。表面層中に残存する界面活性剤の含有率を１０００ｐｐｍ以下とすることによって、インク受容層を設ける場合に塗工液の浸透ムラに起因するインク受容層表面での滲みを好適にできる。前述の透気抵抗度を２００秒以下とすることと併せて、このインク受容層表面での滲みを好適にできるということに対してより効果的となる。 In the inkjet postcard paper according to this embodiment, the content of the surfactant remaining in the surface layer of the single-side coated product is preferably 1000 ppm or less, and more preferably 700 ppm or less. By setting the content of the surfactant remaining in the surface layer to 1000 ppm or less, it is possible to suitably cause bleeding on the surface of the ink receiving layer due to uneven penetration of the coating liquid when the ink receiving layer is provided. Combined with the above-mentioned air resistance of 200 seconds or less, it becomes more effective against the fact that bleeding on the surface of the ink receiving layer can be suitably performed.
次に、本発明の実施例を挙げて説明するが、本発明はこれらの例に限定されるものではない。また、「部」及び「％」は、特に明示しない限り質量部及び質量％を示す。なお、配合において示す部数は、実質成分の数量である。 Next, although an example of the present invention is given and explained, the present invention is not limited to these examples. Further, “parts” and “%” indicate parts by mass and mass% unless otherwise specified. In addition, the number of parts shown in a mixing | blending is the quantity of a real component.
（実施例１）
＜基紙の作製＞
表面層のパルプ配合を広葉樹漂白クラフトパルプ１００部、中間層のパルプ配合を広葉樹漂白クラフトパルプ１０部及び未叩解上質系古紙パルプ９０部、裏面層のパルプ配合を広葉樹漂白クラフトパルプ１００部の各パルプ原料に対して、表面層、中間層、裏面層共通でカチオン化澱粉（ネオタック４０Ｔ、日本食品加工社製）を１．０部、酸性ロジンサイズ剤０．１部（ＡＬ１２１２、星光ＰＭＣ社製）、液体硫酸バンド１部、及びタルクを灰分５％になるよう添加量を調整して配合した紙料を各々長網抄紙機にて抄紙し、表面層坪量６０ｇ／ｍ２、中間層坪量６０ｇ／ｍ２、裏面層坪量６０ｇ／ｍ２の３層を抄き合わせ１８０ｇ／ｍ２の基紙を製造した。なお、実施例１で使用した未叩解上質系古紙パルプは、分散工程においてパルプ濃度を３０％としてコニカル型ディスパーザーによって分散処理し、洗浄工程において３連エキストラクターで洗浄し、この洗浄工程を１回通過させたパルプである。古紙処理工程での脱墨剤（花王社製、ＤＩ−６００Ｒ）の使用量を古紙原料に対して０．２％とした。未叩解上質系古紙パルプのカナディアンスタンダードフリーネス（ＣＳＦ）は４００ｍｌとした。
＜サイズ液の塗布＞
酸化澱粉（王子エースＡ：王子コーンスターチ社製）糊液をサイズ液とし、基紙の両面に乾燥塗工量が片面当たり１ｇ／ｍ２となるようにサイズプレスで塗布し、シリンダードライヤーで乾燥した。スチールカレンダーを用いて線圧４０ｋｇ／ｃｍ、２５℃、２ニップ１パスの条件で表面処理を行った。
＜インク受容層用塗工液の調製＞
合成非晶質シリカ（ニップジェルＢＹ４００：東ソーシリカ社製）１００部に、水とｐＨ調整剤として酢酸０．５部を添加し、カウレス分散機で固形分濃度２８％の顔料スラリーを調製した。この顔料スラリーにポリビニルアルコール１５部（ＰＶＡ−１１７：クラレ社製）、ポリエチレン酢酸ビニルバインダー３５部（スミカフレックス４５０：住友化学社製）、及びインク定着剤１５部（ＳＲ１００１：田岡化学社製）を添加・攪拌し、更に水を添加し、固形分濃度が２０％の塗工液を得た。
＜インク受容層の形成＞
得られたインク受容層用塗工液を通信面に乾燥塗工量が８ｇ／ｍ２となるようにエアナイフコーターで塗工し、エアドライヤーで熱風乾燥した。さらに、ソフトカレンダーを用いて線圧３０ｋｇ／ｃｍ、２５℃、２ニップ１パスの条件で表面処理を行い、インクジェット用葉書用紙を作製した。また全体の古紙パルプ配合割合は、３０％となった。片面塗工品の坪量は、１９０ｇ／ｍ２であった。
Example 1
<Preparation of base paper>
Each surface pulp composition is 100 parts of hardwood bleached kraft pulp, 10 parts of hardwood bleached kraft pulp and 90 parts of unbeaten fine paper pulp, and 100 parts of hardwood bleached kraft pulp is used for the back layer. 1.0 parts of cationized starch (Neotac 40T, manufactured by Nippon Food Processing Co., Ltd.) and 0.1 parts of acidic rosin sizing agent (AL1212, manufactured by Seiko PMC Co., Ltd.) are common to the raw material. , 1 part liquid aluminum sulfate, and talc to papermaking stock formulated by adjusting the amount added so as to be 5% ash at each length paper machine, the surface layer basis weight 60 g / m 2, the intermediate layer basis weight Three layers of 60 g / m 2 and a back layer basis weight of 60 g / m 2 were combined to produce a base paper of 180 g / m 2 . In addition, the unbeaten high-quality waste paper pulp used in Example 1 was dispersed with a conical type disperser with a pulp concentration of 30% in the dispersion step, and washed with a triple extractor in the washing step. It is a pulp that has been passed through twice. The amount of deinking agent used in the used paper processing step (DI-600R, manufactured by Kao Corporation) was 0.2% based on the used paper raw material. The Canadian standard freeness (CSF) of unbeaten high-quality waste paper pulp was 400 ml.
<Application of size liquid>
Oxidized starch (Oji Ace A: manufactured by Oji Cornstarch Co., Ltd.) was used as a sizing solution, applied to both sides of the base paper with a size press so that the dry coating amount was 1 g / m 2 per side, and dried with a cylinder dryer. . Surface treatment was performed using a steel calender under conditions of a linear pressure of 40 kg / cm, 25 ° C., and 2 nips and 1 pass.
<Preparation of coating solution for ink receiving layer>
Water and 0.5 parts of acetic acid as a pH adjuster were added to 100 parts of synthetic amorphous silica (Nipgel BY400: manufactured by Tosoh Silica Co., Ltd.), and a pigment slurry having a solid content concentration of 28% was prepared with a Cowles disperser. To this pigment slurry, 15 parts of polyvinyl alcohol (PVA-117: manufactured by Kuraray Co., Ltd.), 35 parts of polyethylene vinyl acetate binder (Sumikaflex 450: manufactured by Sumitomo Chemical Co., Ltd.), and 15 parts of ink fixing agent (SR1001: manufactured by Taoka Chemical Co., Ltd.) Addition and stirring were performed, and water was further added to obtain a coating solution having a solid content of 20%.
<Formation of ink receiving layer>
The obtained ink receiving layer coating solution was applied to the communication surface with an air knife coater so that the dry coating amount was 8 g / m 2, and dried with hot air using an air dryer. Further, a surface treatment was performed using a soft calender under the conditions of a linear pressure of 30 kg / cm, 25 ° C., and 2 nips and 1 pass to prepare an ink-jet postcard paper. Further, the total proportion of waste paper pulp was 30%. The basis weight of the single-side coated product was 190 g / m 2 .
（実施例２〜８、比較例１〜３）
基紙に使用する基紙全体の古紙パルプ配合量、各層の古紙パルプ配合割合及び古紙パルプを製造するときに古紙処理工程にある洗浄工程の処理回数を変更した以外は、実施例１に準じインクジェット用葉書用紙を作製した。前記変更点は、実施例１も含めて表１に示し、また、得られた各層の界面活性剤の含有量、サイズ剤の塗工量、基紙の透気抵抗度、片面塗工品の透気抵抗度、基紙全体の古紙パルプ配合割合％、各層の古紙パルプ配合割合％、洗浄回数及び片面塗工品の坪量の測定結果を合わせて示す。
(Examples 2-8, Comparative Examples 1-3)
Ink jet according to Example 1 except that the amount of used paper pulp in the entire base paper used for the base paper, the ratio of the used paper pulp in each layer, and the number of times of the washing process in the used paper processing step when manufacturing the used paper pulp were changed. A postcard paper was prepared. The changes are shown in Table 1 including Example 1, and the content of the surfactant in each layer, the coating amount of the sizing agent, the air resistance of the base paper, the single-side coated product The results of measurement of air resistance, percentage of recycled paper pulp in the entire base paper, percentage of recycled paper pulp in each layer, number of washings and basis weight of single-side coated product are also shown.
（実施例９）
実施例１と同じ紙料を用いて、表面層坪量４０ｇ／ｍ２、中間層坪量６０ｇ／ｍ２、裏面層坪量４０ｇ／ｍ２の３層を抄き合わせ１４０ｇ／ｍ２の基紙を製造した。この基紙に、実施例１の場合と同様にサイズ剤の塗工及びインク受容層用塗工液を用いて塗工を行い、インクジェット用葉書用紙を作製した。片面塗工品の坪量は、１５０ｇ／ｍ２であった。前記変更点は、表１に示し、また、得られた各層の界面活性剤の含有量、サイズ剤の塗工量、基紙の透気抵抗度、片面塗工品の透気抵抗度、基紙全体の古紙パルプ配合割合％、各層の古紙パルプ配合割合％、洗浄回数及び片面塗工品の坪量の測定結果を合わせて示す。
Example 9
Using the same paper material as in Example 1, three layers of a surface layer basis weight of 40 g / m 2 , an intermediate layer basis weight of 60 g / m 2 , and a back layer basis weight of 40 g / m 2 were combined to make a base of 140 g / m 2 . Paper was manufactured. This base paper was coated with a sizing agent and an ink-receiving layer coating solution in the same manner as in Example 1 to prepare an inkjet postcard paper. The basis weight of the single-side coated product was 150 g / m 2 . The changes are shown in Table 1, and the content of the surfactant in each layer obtained, the coating amount of the sizing agent, the air resistance of the base paper, the air resistance of the single-side coated product, the base It shows together the measurement results of the waste paper pulp blending ratio% of the entire paper, the waste paper pulp blending ratio% of each layer, the number of washings, and the basis weight of the single-side coated product.
（実施例１０）
実施例１と同じ紙料を用いて、表面層坪量８０ｇ／ｍ２、中間層坪量８０ｇ／ｍ２、裏面層坪量８０ｇ／ｍ２の３層を抄き合わせ２４０ｇ／ｍ２の基紙を製造した。この基紙に、実施例１の場合と同様にサイズ剤の塗工及びインク受容層用塗工液を用いて塗工を行い、インクジェット用葉書用紙を作製した。片面塗工品の坪量は、２５０ｇ／ｍ２であった。前記変更点は、表１に示し、また、得られた各層の界面活性剤の含有量、サイズ剤の塗工量、基紙の透気抵抗度、片面塗工品の透気抵抗度、基紙全体の古紙パルプ配合割合％、各層の古紙パルプ配合割合％、洗浄回数及び片面塗工品の坪量の測定結果を合わせて示す。
(Example 10)
Using the same paper material as in Example 1, a surface layer basis weight of 80 g / m 2 , an intermediate layer basis weight of 80 g / m 2 , and a back layer basis weight of 80 g / m 2 were combined to make a base of 240 g / m 2 . Paper was manufactured. This base paper was coated with a sizing agent and an ink-receiving layer coating solution in the same manner as in Example 1 to prepare an inkjet postcard paper. The basis weight of the single-side coated product was 250 g / m 2 . The changes are shown in Table 1, and the content of the surfactant in each layer obtained, the coating amount of the sizing agent, the air resistance of the base paper, the air resistance of the single-side coated product, the base It shows together the measurement results of the waste paper pulp blending ratio% of the entire paper, the waste paper pulp blending ratio% of each layer, the number of washings, and the basis weight of the single-side coated product.
（比較例４）
＜サイズ液の塗布＞
酸化澱粉（王子エースＡ：王子コーンスターチ社製）糊液をサイズ液とし、基紙の両面に乾燥塗工量が片面当たり２ｇ／ｍ２となるようにサイズプレスで塗布したこと以外は、
実施例３に準じインクジェット用葉書用紙を作製した。前記変更点は、表１に示し、また、得られた各層の界面活性剤の含有量、サイズ剤の塗工量、基紙の透気抵抗度、片面塗工品の透気抵抗度、基紙全体の古紙パルプ配合割合％、各層の古紙パルプ配合割合％、洗浄回数及び片面塗工品の坪量の測定結果を合わせて示す。
(Comparative Example 4)
<Application of size liquid>
Oxidized starch (Oji Ace A: manufactured by Oji Corn Starch Co., Ltd.) was used as a sizing liquid, except that it was applied with a size press so that the dry coating amount was 2 g / m 2 per side on both sides of the base paper.
Inkjet postcard paper was prepared in accordance with Example 3. The changes are shown in Table 1, and the content of the surfactant in each layer obtained, the coating amount of the sizing agent, the air resistance of the base paper, the air resistance of the single-side coated product, the base It shows together the measurement results of the waste paper pulp blending ratio% of the entire paper, the waste paper pulp blending ratio% of each layer, the number of washings, and the basis weight of the single-side coated product.
（比較例５）
＜サイズ液の塗布＞
酸化澱粉（王子エースＡ：王子コーンスターチ社製）糊液をサイズ液とし、基紙の両面に乾燥塗工量が片面当たり３ｇ／ｍ２となるようにサイズプレスで塗布したこと以外は、
実施例１に準じインクジェット用葉書用紙を作製した。前記変更点は、表１に示し、また、得られた各層の界面活性剤の含有量、サイズ剤の塗工量、基紙の透気抵抗度、片面塗工品の透気抵抗度、基紙全体の古紙パルプ配合割合％、各層の古紙パルプ配合割合％、洗浄回数及び片面塗工品の坪量を合わせて示す。
(Comparative Example 5)
<Application of size liquid>
Oxidized starch (Oji Ace A: manufactured by Oji Cornstarch Co., Ltd.) was used as a sizing liquid, except that it was applied on both sides of the base paper with a size press so that the dry coating amount was 3 g / m 2 per side.
Inkjet postcard paper was prepared in accordance with Example 1. The changes are shown in Table 1, and the content of the surfactant in each layer obtained, the coating amount of the sizing agent, the air resistance of the base paper, the air resistance of the single-side coated product, the base The percentage of waste paper pulp in the entire paper, the percentage of waste paper pulp in each layer, the number of washings, and the basis weight of the single-side coated product are shown together.
（比較例６）
実施例４において、使用古紙のフリーネスを２５０ｍｌとした以外は、同様にしてインクジェット葉書用紙を得た。
(Comparative Example 6)
Inkjet postcard paper was obtained in the same manner as in Example 4 except that the freeness of used paper was 250 ml.
（比較例７）
実施例４において、ソフトキャレンダー処理数を１パスから３パスとした以外は、同様にしてインクジェット葉書用紙を得た。
(Comparative Example 7)
Inkjet postcard paper was obtained in the same manner as in Example 4 except that the number of soft calendar processes was changed from 1 pass to 3 passes.
（比較例８）
実施例４において、脱墨剤を０．２％から０．３％とした以外は、同様にしてインクジェット葉書用紙を得た。
(Comparative Example 8)
Inkjet postcard paper was obtained in the same manner as in Example 4 except that the deinking agent was changed from 0.2% to 0.3%.
以上の実施例及び比較例において得られたインクジェット葉書用紙について、表２に通信面及び宛名面のインクジェット印字適性、宛名面ペン書きサイズ度評価及びプロセス印刷適性（版持ち及びブランケット汚れ）評価の結果を示す。 For the ink jet postcard paper obtained in the above examples and comparative examples, Table 2 shows the results of evaluation of ink jet printing suitability on the communication side and address side, address side pen writing size evaluation, and process printing suitability (plate holding and blanket stains). Indicates.
＜評価方法＞
得られたインクジェット用葉書用紙は、２３℃−５０％ＲＨの恒温恒湿室で２４時間調湿後、同環境下でそれぞれ次に示す方法によって、評価を行った。
<Evaluation method>
The obtained postcard paper for inkjet was evaluated by the following methods under the same environment after humidity control for 24 hours in a constant temperature and humidity chamber of 23 ° C.-50% RH.
＜インクジェット印字適性＞
市販のフルカラーインクジェットプリンター（商品名：ＰＭ−９００Ｃ、セイコーエプソン社製）を用いて、通信面には写真画像をフルカラーインクで印字し、宛名面にはブラックインクだけで文字を印字し、通信面は画像細部のムラの他、境界部の滲み、発色の鮮やかさなどを目視観察、宛名面はフェザリングなどを目視観察してインクジェット印字適性を評価した。
<Inkjet printing aptitude>
Using a commercially available full-color ink jet printer (trade name: PM-900C, manufactured by Seiko Epson Corporation), a photographic image is printed with full-color ink on the communication surface, and characters are printed with only black ink on the address surface. In addition to the unevenness of the image details, the blurring of the boundary portion and the vividness of the coloring were visually observed, and the address surface was visually observed for feathering and the like to evaluate the suitability for inkjet printing.
前記インクジェット印字適性の評価は、次に示す要領によって記述することにした。
◎…優れている（実用レベル）、○…良い（実用レベル）、△…やや劣る（実用下限レベル）、×…劣る（実用に適さない）。
The inkjet printability evaluation was described according to the following procedure.
A: Excellent (practical level), B: Good (practical level), B: Slightly inferior (practical lower limit level), X: Inferior (not suitable for practical use)
＜ペン書きサイズ度評価＞
Ｊ ＴＡＰＰＩ紙パルプ試験方法Ｎｏ１２−７６で規定する測定方法に従い、宛名面のペン書きサイズ度を測定し評価した。
<Pen writing size evaluation>
According to the measurement method prescribed | regulated by JTAPPI paper pulp test method No12-76, the pen writing sizing degree of the address surface was measured and evaluated.
前記試験方法に従って、０から６等級で報告したものを、次に示す要領によって記述することにした。
◎…６（実用でき、良好）、○…５（実用下限）、△…４（不適）、×…３以下（不適）。
According to the test method, what was reported in grades 0 to 6 will be described in the following manner.
A: 6 (practical and good), B: 5 (lower practical limit), B: 4 (unsuitable), X: 3 or less (unsuitable)
＜透気抵抗度の測定＞
ＪＩＳ Ｐ ８１１７：１９９８（紙及び板紙−透気度試験方法−ガーレー試験機法）で規定する測定方法に従い、ガーレー式透気度計によって測定した。
<Measurement of air resistance>
It measured with the Gurley type air permeability meter according to the measuring method prescribed | regulated by JISP8117: 1998 (paper and paperboard-air permeability test method-Gurley test machine method).
＜プロセス印刷適性評価＞
実機印刷機（リョービ社製、リョービ３３０２Ｍ）を用いて、宛名面側に郵便番号枠、切手貼り付け枠、及びテストパターンをプロセス印刷し、版持ちとブランケット汚れを評価した。
<Process printability evaluation>
Using an actual printing machine (Ryobi 3302M, manufactured by Ryobi Co., Ltd.), a postal code frame, a stamp pasting frame, and a test pattern were process printed on the address side, and plate holding and blanket contamination were evaluated.
前記版持ちとブランケット汚れの評価は、次に示す要領によって記述することにした。なお版持ちは印刷版が汚れるまでの印刷枚数を、ブランケット汚れは５０００枚印刷後のブランケットの汚れ具合を目視評価した。
版持ちの評価：◎…２０万枚以上（実用レベル）、○…１０万枚以上（実用レベル）、△…３万枚以上(実用下限)、×…３万枚以下（使用不可）。
ブランケット汚れの評価：◎…実用レベル以上、○…実用レベル、△…実用下限、×…使用不可。
The evaluation of the plate holding and blanket contamination was described in the following manner. The plate holding was evaluated by visually evaluating the number of printed sheets until the printing plate was stained, and the blanket stain was visually evaluated for the blanket after 5000 sheets were printed.
Evaluation of plate holding: ◎ ... 200,000 or more (practical level), ○ ... 100,000 or more (practical level), △ ... 30,000 or more (practical lower limit), × ... 30,000 or less (unusable).
Blanket dirt evaluation: ◎ ... practical level or higher, ○ ... practical level, △ ... practical lower limit, x ... unusable.
＜界面活性剤含有率測定試料＞
表面層についてはインク受容層にあたるため、インク受容層をカミソリで除去した後、基紙を抄き合わせ部分から層別し、インク受容層側の最上層を表面層とし、また非塗工面側の最上層を裏面層とし、界面活性剤含有量測定用の試料とした。
<Surfactant measurement sample>
Since the surface layer corresponds to the ink receiving layer, after removing the ink receiving layer with a razor, the base paper is layered from the combined portion, the uppermost layer on the ink receiving layer side is the surface layer, and the non-coated surface side is The uppermost layer was the back layer, and a sample for measuring the surfactant content was used.
実施例と比較例では、基紙の透気抵抗度が２５秒から９０秒の範囲となったが、これは、ここで使用される古紙パルプの配合率、古紙パルプ中の微細繊維量の要因によって変化したものであり、使用される古紙パルプの配合率を増減することで基紙の透気抵抗度を制御することができ（古紙パルプの配合率を増やすと透気抵抗度が上がる）、また、古紙パルプ中の微細繊維量を古紙処理工程中の洗浄度合いを増減することで基紙の透気抵抗度を制御することができ（古紙処理工程中の洗浄度合いを多くすると透気抵抗度が上がる）、実施例では、基紙の透気抵抗度を６０秒以下に調整した。なお、古紙のフリーネスが低いものを使用すれば透気抵抗度が上がり、ＬＢＫＰを使用する前に濃縮したものを使用すると、微細繊維が抜けて透気抵抗度が低くなることを利用して、透気抵抗度を制御してもよい。次に、実施例と比較例では、片面塗工品の透気抵抗度は、６５秒から２３８秒の範囲となったが、これは、基紙の透気抵抗度、インク受容層を設けた後のソフトキャレンダー処理の加圧の要因によって変化したものであり、基紙の透気抵抗度を増減することによって片面塗工品の透気抵抗度を制御することができ（基紙の透気抵抗度を下げると片面塗工品の透気抵抗度も下がる）、また、ソフトキャレンダー処理の加圧力を増減又は処理の回数を増減することによって片面塗工品の透気抵抗度を制御することができ（ソフトキャレンダー処理の加圧を緩めることによって又は処理の回数を減らすことによって片面塗工品の透気抵抗度も下がる）、実施例では、片面塗工品の透気抵抗度をすべて２００秒以下に調整した。表面層及び裏面層の界面活性剤含有量は、脱墨剤の濃度を減らし、洗浄回数を多くし、洗浄機から発生する汚水の廃棄率を多くすることで、低減させることができ、実施例では、裏面層の界面活性剤含有量を５００ｐｐｍ以下に調整した。 In Examples and Comparative Examples, the air resistance of the base paper was in the range of 25 seconds to 90 seconds. This was due to the ratio of the used paper pulp used here and the amount of fine fibers in the used paper pulp. The air permeability resistance of the base paper can be controlled by increasing or decreasing the ratio of used paper pulp used (increasing the ratio of used paper pulp increases the air resistance) In addition, the air resistance of the base paper can be controlled by increasing or decreasing the amount of fine fibers in the waste paper pulp during the waste paper treatment process. In the examples, the air resistance of the base paper was adjusted to 60 seconds or less. In addition, if you use a thing with low freeness of waste paper, the air resistance increases, and if you use a concentrated one before using LBKP, using the fact that fine fibers come out and the air resistance decreases, The air resistance may be controlled. Next, in the examples and comparative examples, the air resistance of the single-sided coated product was in the range of 65 seconds to 238 seconds. This was because the air resistance of the base paper and the ink receiving layer were provided. The air resistance of the single-sided coated product can be controlled by increasing or decreasing the air resistance of the base paper. Decreasing the air resistance also reduces the air resistance of single-sided coated products), and also controls the air resistance of single-sided coated products by increasing / decreasing the pressure applied to the soft calendar process or increasing / decreasing the number of treatments. (By reducing the pressure of the soft calendering process or by reducing the number of treatments, the air resistance of the single-sided coated product is also reduced). Were adjusted to 200 seconds or less. The surfactant content of the surface layer and the back layer can be reduced by reducing the concentration of the deinking agent, increasing the number of times of cleaning, and increasing the disposal rate of sewage generated from the cleaning machine. Then, the surfactant content of the back layer was adjusted to 500 ppm or less.
実施例では、片面塗工品の透気抵抗度を２００秒以下、かつ、裏面層の界面活性剤含有量を５００ｐｐｍ以下としたので、宛名面でのインクジェット印字適性に優れ、宛名面ペン書きサイズ度評価も優れ、版持ちもよく、ブランケット汚れも少なかった。一方、比較例１では、裏面層の界面活性剤含有量が５００ｐｐｍを超えており、宛名面でのインクジェット印字適性が劣り、宛名面ペン書きサイズ度評価が不適であった。比較例２では、裏面層の界面活性剤含有量が５００ｐｐｍを超えており、また表面層の界面活性剤含有量が１０００ｐｐｍを超えており、比較例１と比べて、宛名面でのインクジェット印字適性と宛名面ペン書きサイズ度評価の不適に加え、更に通信面でのインクジェット印字適性が低下した。比較例３では、裏面層の界面活性剤含有量が５００ｐｐｍを超えており、また表面層の界面活性剤含有量が１０００ｐｐｍを超えており、更に片面塗工品の透気抵抗度が２００秒を超えているため、全ての評価が不適となった。比較例４及び５は、片面塗工品の透気抵抗度が２００秒を超えているため、通信面でのインクジェット印字適性が不適であった。比較例６は、使用した古紙のフリーネスが２５０ｍｌであり、基紙の透気抵抗度が上がりその結果、片面塗工品の透気抵抗度が２００秒を超えているため、通信面でのインクジェット印字適性が不適であった。比較例７は、ソフトキャレンダー処理を１パスから３パスとしたため、片面塗工品の透気抵抗度が２００秒を超えているため、通信面でのインクジェット印字適性が不適であった。比較例８は、脱墨剤を０．３％としたため、界面活性剤の含有量が増加し、いずれの特性も低く、特にインクジェット印字適性、宛名面ペン書きサイズ度が不適であった。 In the examples, the air resistance of the single-side coated product was 200 seconds or less, and the surfactant content of the back layer was 500 ppm or less. The degree evaluation was excellent, the plate was good, and the blanket was not dirty. On the other hand, in Comparative Example 1, the surfactant content in the back surface layer exceeded 500 ppm, the inkjet printing suitability on the address surface was poor, and the address surface pen writing size evaluation was unsuitable. In Comparative Example 2, the surfactant content of the back layer exceeds 500 ppm, and the surfactant content of the surface layer exceeds 1000 ppm. Compared with Comparative Example 1, the ink jet printing suitability on the address side In addition to the inappropriate evaluation of the size of writing on the address side pen, the suitability of inkjet printing on the communication side was further reduced. In Comparative Example 3, the surfactant content of the back layer exceeds 500 ppm, the surfactant content of the surface layer exceeds 1000 ppm, and the air resistance of the single-side coated product is 200 seconds. Since it exceeded, all evaluations became inappropriate. In Comparative Examples 4 and 5, since the air resistance of the single-side coated product exceeded 200 seconds, the suitability for inkjet printing on the communication surface was unsuitable. In Comparative Example 6, the used paper has a freeness of 250 ml, and the air resistance of the base paper is increased. As a result, the air resistance of the single-side coated product exceeds 200 seconds. The printability was unsuitable. In Comparative Example 7, since the soft calendering process was changed from 1 pass to 3 passes, the air permeability resistance of the single-side coated product exceeded 200 seconds, and thus the ink jet printing suitability on the communication surface was unsuitable. In Comparative Example 8, since the deinking agent was 0.3%, the content of the surfactant was increased, and all the characteristics were low. In particular, the suitability for inkjet printing and the size of writing on the address surface pen were unsuitable.
本発明によってインクジェット用葉書用紙に関し、インクジェットプリンター印字後の滲みがなく、宛名面における水性ペンでの筆記性に優れ、更には版持ちなどの印刷適性が良好な性能が得られすべてバージンパルプを用いた葉書用紙と同等の性能を得ることができた。したがって、古紙パルプを配合したインクジェット葉書用紙への利用可能性を有する。 According to the present invention, there is no bleeding after printing on an inkjet printer, excellent writing performance with a water-based pen on the address side, and good printability such as plate holding, and all use virgin pulp. We were able to obtain the same performance as the postcard paper. Therefore, it has applicability to ink jet postcard paper containing waste paper pulp.
Claims (3)
前記基紙の層のうち、前記インク受容層と接する層を表面層、反対側の層を裏面層、該表面層と該裏面層との中間に位置する層を中間層とそれぞれ表記したとき、該中間層が１層以上で形成され、かつ、
１）前記片面塗工品の裏面層中に残存する界面活性剤の含有率が５００ｐｐｍ以下、
２）前記片面塗工品の透気抵抗度（ＪＩＳ Ｐ ８１１７：１９９８（紙及び板紙−透気度試験方法−ガーレー試験機法））が２００秒以下、
であることを特徴とするインクジェット用葉書用紙。 An ink receiving layer mainly containing a pigment is provided on one side of a three or more layered base paper, and the base paper is exposed without an ink receiving layer on the opposite side of the base paper. The basis weight of a single-side coated product having an ink receiving layer provided on only one side of the base paper (JIS P 8124: 1998 (paper and paperboard- In the postcard paper for a multi-layer paper-jet which has a basis weight measuring method)) of 150 to 250 g / m 2 ,
Among the layers of the base paper, when the layer in contact with the ink receiving layer is represented as a surface layer, the opposite layer is represented as a back layer, and the layer located between the surface layer and the back layer is represented as an intermediate layer, The intermediate layer is formed of one or more layers, and
1) The content of the surfactant remaining in the back surface layer of the one-side coated product is 500 ppm or less,
2) Air permeability resistance (JIS P 8117: 1998 (paper and paperboard-air permeability test method-Gurley test machine method)) of the one-side coated product is 200 seconds or less,
An ink-jet postcard paper characterized by that.
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| JP2015172260A (en) * | 2014-03-11 | 2015-10-01 | 北越紀州製紙株式会社 | Method of producing white paperboard |
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