JP2009114572A - Core base paper for corrugated fiberboard - Google Patents
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本発明は、段ボール用の中芯（中しん）原紙に関するものである。 The present invention relates to a core paper for corrugated cardboard.
段ボールは軽量で安価なため、各種物品の包装、運搬に使用される産業上の基礎資材であり、一般に中芯原紙とライナをコルゲータで貼り合わせて製造される。段ボールはその用途から圧縮強度が要求されるので、特に中芯の圧縮強度が重視される。近年軽量化、資源の節約、コストダウンなどより単位面積当たりの重量の割に強度の高い中芯が普及し、その生産量が年々増大している。
このような強度の高い中芯原紙を得るための製造法としては、強度の高いパルプを原料として使用する方法（例えば、特許文献１参照。）、抄造時の紙料にポリアクリルアミドなどの合成紙力増強剤を添加する方法（例えば、特許文献２参照。）、抄造された湿紙に澱粉の水性懸濁液をスプレーする方法（例えば、特許文献３参照。）、抄造された紙に石油樹脂、ポリスチレンなどの樹脂を含浸する方法（例えば、特許文献４参照。）などが知られており、一部で実用に供されている。
これらの中芯の製造法のうち、強度の高いパルプを原料とする方法は古紙が主体の中芯原紙にあって高価なパルプを使用することは経済性の点で不利であること、ポリアクリルアミドなどを添加する方法は離解性が低下するため、損紙や段ボールの離解回収が困難となること、肝心のライナとの貼合性が低下する（段ボール接着剤とポリアクリルアミドとの親和性が比較的乏しいため、貼合速度や接着強度が出にくい）ことなどの解決すべき課題が存在する。また、澱粉スプレー法は貼合性や経済性では良好な反面、霧滴の飛散により抄紙機が汚れやすいこと、樹脂含浸法は耐水強度が得られやすい反面、貼合性、離解性、経済性などの解決すべき課題がある。このように、従来の中芯原紙には一長一短があるため、業界ではこれらの課題を解決した中芯原紙が強く要望されている。
As a production method for obtaining such a high-strength core base paper, a method using a high-strength pulp as a raw material (for example, see Patent Document 1), a synthetic paper such as polyacrylamide as a paper stock at the time of papermaking A method of adding a force enhancer (see, for example, Patent Document 2), a method of spraying an aqueous suspension of starch onto a made wet paper (see, for example, Patent Document 3), and a petroleum resin on the made paper. A method of impregnating a resin such as polystyrene (for example, see Patent Document 4) is known, and some of them are put into practical use.
Among these core manufacturing methods, the method using high-strength pulp as the raw material is disadvantageous in terms of economy to using expensive pulp because the core paper is mainly used waste paper, polyacrylamide Addition methods such as the above decrease the disaggregation property, making it difficult to disaggregate waste paper and corrugated cardboard, and lowering the adhesiveness with the core liner (the affinity between corrugated adhesive and polyacrylamide is compared) Therefore, there is a problem to be solved, such as that it is difficult to obtain a bonding speed and adhesive strength. The starch spray method is good in terms of bonding properties and economy, while the paper machine tends to get dirty due to splashing of mist droplets, while the resin impregnation method is easy to obtain water resistance strength, but the bonding properties, disaggregation properties, and economic properties. There are issues to be solved. Thus, since the conventional core base paper has advantages and disadvantages, there is a strong demand in the industry for a core base paper that solves these problems.
本発明が解決しようとする主たる課題は、貼合性（貼合適性）やケース強度、経済性を損なわずに、圧縮強さを改善した段ボール用の中芯原紙を提供することにある。 The main problem to be solved by the present invention is to provide a core base paper for corrugated cardboard having improved compressive strength without impairing bonding properties (bonding suitability), case strength, and economy.
この課題を解決した本発明は、次のとおりである。
〔請求項１記載の発明〕
古紙パルプを主原料とし、少なくとも２層からなる積層構造の段ボール用の中芯原紙であって、
ワイヤーパートにおいて湿紙間に澱粉の水溶液が設けられた積層体が形成され、更にコーターパートにおいて当該積層体の両面に澱粉の水溶液がフィルムトランスファー方式で塗布され、
ＪＩＳ Ｐ ８１２６：２００５「紙及び板紙‐圧縮強さ試験方法‐リングクラッシュ法」に準拠した横方向の比圧縮強さが１８０Ｎ・ｍ2／ｇ以上とされている、
ことを特徴とする段ボール用の中芯原紙。
The present invention that has solved this problem is as follows.
[Invention of Claim 1]
A core raw paper for corrugated cardboard with a laminated structure consisting of at least two layers, mainly from waste paper pulp,
In the wire part, a laminate in which an aqueous starch solution is provided between the wet papers is formed, and in the coater part, an aqueous starch solution is applied to both sides of the laminate by a film transfer method.
The specific compressive strength in the transverse direction in accordance with JIS P 8126: 2005 “paper and paperboard—compressive strength test method—ring crush method” is 180 N · m 2 / g or more,
A core base paper for cardboard.
〔請求項２記載の発明〕
含有される澱粉総量が５．０〜１５．０ｇ／ｍ2とされている、請求項１記載の段ボール用の中芯原紙。
[Invention of Claim 2]
Starch total contained is a 5.0~15.0g / m 2, corrugating in the carton according to claim 1, wherein.
〔請求項３記載の発明〕
前記フィルムトランスファー方式で塗布される澱粉として、アニオン性澱粉、カチオン性澱粉及び両性澱粉のいずれか一種以上が使用されている、請求項１又は請求項２記載の段ボール用の中芯原紙。
[Invention of Claim 3]
The core base paper for corrugated cardboard according to claim 1 or 2, wherein at least one of anionic starch, cationic starch and amphoteric starch is used as the starch applied by the film transfer method.
〔請求項４記載の発明〕
ＪＩＳ Ｐ ８２２０：１９９８「パルプ‐離解方法」に準拠して原料パルプを離解し、得られた離解パルプのＪＩＳ Ｐ ８１２１：１９９５「パルプのろ水度試験方法」に準拠したフリーネスが２５０〜４５０ｍｌＣＳＦになるように調整されたパルプを原料とする、請求項１〜３のいずれか１項に記載の段ボール用の中芯原紙。
[Invention of Claim 4]
The raw pulp is disaggregated according to JIS P 8220: 1998 “pulp-disaggregation method”, and the freeness according to JIS P 8121: 1995 “pulp freeness test method” of the obtained disaggregated pulp is 250 to 450 ml CSF. The core base paper for corrugated board of any one of Claims 1-3 which uses the pulp adjusted so that it might become.
本発明によると、貼合性（点合適性）や離解性、経済性を損なわずに、圧縮強さを改善した段ボール用の中芯原紙となる。 According to the present invention, a core base paper for corrugated cardboard having improved compressive strength is obtained without impairing bonding properties (pointing suitability), disaggregation properties, and economic efficiency.
次に、本発明の実施の形態を説明する。
本実施の形態の段ボール用の中芯原紙は、古紙パルプを主原料とし、少なくとも２層からなる積層構造とされ、ワイヤーパートにおいて例えば下側に位置する湿紙上に澱粉の水溶液が、好ましくは未糊化の澱粉の水溶液が、より好ましくは未糊化の澱粉の懸濁水溶液が設けられて、好ましくはスプレー噴霧されてから上側の湿紙が積層されて積層体が形成され、更にコーターパートにおいて当該積層体の両面に澱粉の水溶液が、好ましくは糊化澱粉の水溶液がフィルムトランスファー方式で塗布され、ＪＩＳ Ｐ ８１２６：２００５「紙及び板紙‐圧縮強さ試験方法‐リングクラッシュ法」に準拠した横方向の比圧縮強さが１８０Ｎ・ｍ2／ｇ以上とされている、ことを特徴とする。
Next, an embodiment of the present invention will be described.
The core base paper for corrugated board of the present embodiment is made of waste paper pulp as a main raw material and has a laminated structure consisting of at least two layers. In the wire part, for example, an aqueous starch solution is preferably placed on the wet paper located on the lower side. An aqueous solution of gelatinized starch, more preferably an aqueous suspension of ungelatinized starch, is preferably sprayed and then the upper wet paper is laminated to form a laminate, and further in the coater part An aqueous solution of starch, preferably an aqueous solution of gelatinized starch, is applied to both sides of the laminate by a film transfer method, and a horizontal paper according to JIS P 8126: 2005 “Paper and paperboard—Compressive strength test method—Ring crush method” The specific compressive strength in the direction is 180 N · m 2 / g or more.
本実施の形態において、原料パルプは、古紙パルプを主原料（５０質量％以上）とするが、その他の原料パルプは、特に限定されない。その他の原料パルプとしては、例えば、紙・板紙の製造に用いられるパルプであるサルファイトパルプ、クラフトパルプ、ソーダパルプ等のケミカルパルプ、セミケミカルパルプ、メカニカルパルプなどの木材パルプ；こうぞ、みつまた、麻などの非木材パルプ；古紙を処理して製造される古紙パルプなど各種のパルプを例示できる。また、これらは未晒パルプでも晒パルプでもよい。さらに、バージンパルプを含有させてもよいが、省資源及び原料コストの面からは現実的ではない。 In the present embodiment, the raw material pulp uses waste paper pulp as a main raw material (50% by mass or more), but other raw material pulps are not particularly limited. Other raw pulps include, for example, sulphite pulp, pulp used in the manufacture of paper and paperboard, kraft pulp, soda pulp and other wood pulp, semi-chemical pulp, mechanical pulp and other wood pulp; Non-wood pulp such as hemp; various pulps such as waste paper pulp produced by treating waste paper can be exemplified. These may be unbleached pulp or bleached pulp. Furthermore, although virgin pulp may be contained, it is not realistic from the viewpoint of resource saving and raw material cost.
本発明は、十分な貼合性（貼合適性）や離解性、経済性を損なわずに、圧縮強さを改善した段ボール用の中芯原紙を提供するという課題を有する。古紙含有率の高いパルプを使用して製造する場合に特に有利である。本発明は、古紙パルプを６０質量％以上においても、貼合性（点合適性）や離解性、経済性を損なわずに、高い圧縮強さが得られる効果を発揮する。 This invention has the subject of providing the core base paper for corrugated boards which improved compression strength, without impairing sufficient bondability (bonding suitability), disaggregation property, and economical efficiency. This is particularly advantageous when manufacturing using pulp having a high waste paper content. The present invention exhibits the effect of obtaining high compressive strength without deteriorating pasting property (pointing suitability), disaggregation property, and economic efficiency even when the used paper pulp is 60% by mass or more.
古紙パルプとしては、段ボール古紙、製本、印刷工場、裁断所等において発生する裁落、損紙、幅落としした古紙である上白、特白、中白、白損等の未印刷古紙を解離した古紙パルプ、上質紙、上質コート紙、中質紙、中質コート紙、更紙等に平版、凸版、凹版印刷等、電子写真方式、感熱方式、熱転写方式、感圧記録方式、インクジェット記録方式、カーボン紙などにより印字された古紙、及び水性、油性インクや、鉛筆などで筆記した古紙、新聞古紙を離解後脱墨したパルプ（以下、ＤＩＰと略記する）、製紙スラッジ、製紙工場排水スカム等を用いることができる。原料パルプは、ＪＩＳ Ｐ ８２２０：１９９８「パルプ‐離解方法」に準拠して離解し、得られた離解パルプのＪＩＳ Ｐ ８１２１：１９９５「パルプのろ水度試験方法」に準拠したフリーネスが２５０〜４５０ｍｌＣＳＦ、好ましくは３００〜４００ｍｌＣＳＦになるように調整されたパルプであることが好適である。フリーネスが２５０ｍｌＣＳＦ未満であると、抄紙工程のウエットエンドでの濾水性コントロールが困難になり、原料歩留が低下するとともに、紙層中の平均繊維長が短くなるため比圧縮強さが低下する問題が生じる。他方、フリーネスが４５０ｍｌＣＳＦを超える事は、ウエットエンドでの脱水性は良好であるがパルプ繊維同士の絡み合いが少なく、ウエットシートの強度が不足する問題が生じるほか、原料パルプに長繊維分の多い古紙を使用する必要が生じるなど、選択的な原料調整が必要になり、コストアップの問題が生じる。
本形態において、フリーネスの調節は、例えば、原料として用いる古紙の選択、公知の叩解処理などの調節手段を取ることによって、行うことができる。
As waste paper pulp, unprinted waste paper such as corrugated waste paper, bookbinding, printing factory, cutting office, etc. Used paper pulp, high quality paper, high quality coated paper, medium quality paper, medium quality coated paper, reprinted paper, flat plate, letterpress, intaglio printing, electrophotographic method, heat sensitive method, thermal transfer method, pressure sensitive recording method, ink jet recording method, Waste paper printed with carbon paper, etc., water-based, oil-based ink, waste paper written with a pencil, etc., pulp that has been deinked after disaggregating waste paper (hereinafter abbreviated as DIP), paper sludge, paper mill wastewater scum, etc. Can be used. The raw pulp is disaggregated according to JIS P 8220: 1998 “pulp-disaggregation method”, and the freeness according to JIS P 8121: 1995 “pulp freeness test method” of the obtained disaggregated pulp is 250 to 450 ml CSF. The pulp is preferably adjusted to 300 to 400 ml CSF. When the freeness is less than 250 ml CSF, it becomes difficult to control the drainage at the wet end of the paper making process, the raw material yield is lowered, and the average fiber length in the paper layer is shortened so that the specific compressive strength is lowered. Occurs. On the other hand, if the freeness exceeds 450 ml CSF, the dewaterability at the wet end is good, but there is little problem of entanglement between the pulp fibers and the strength of the wet sheet is insufficient. As a result, it becomes necessary to selectively adjust the raw materials, such as the need to use the material.
In this embodiment, the freeness can be adjusted by, for example, selecting a waste paper used as a raw material or using a known beating process.
ワイヤーパートにおいては、複数のインレットを有する多層の長網抄紙機が、積層体の中芯を製造するうえで好適に用いられる。
本形態で使用される澱粉は、その種類が特に限定されず、例えば、コーンスターチ（とうもろこし澱粉）、馬鈴薯澱粉、甘藷澱粉、アセチル化タピオカ澱粉等の各種の未加工、加工澱粉を使用することができるが、課題の一つとする経済性、圧縮強度を考慮すればコーンスターチが最も好適である。また、澱粉としては、酸化澱粉、アニオン性澱粉、カチオン性澱粉及び両性澱粉のいずれか一種、又は併用して使用されていると、理由は定かではないが湿紙の層間において澱粉の分散性が良く、より好ましいものとなる。
In the wire part, a multi-layered long paper machine having a plurality of inlets is suitably used for producing the core of the laminate.
The type of starch used in the present embodiment is not particularly limited. For example, various raw and processed starches such as corn starch (corn starch), potato starch, sweet potato starch, and acetylated tapioca starch can be used. However, corn starch is most suitable in consideration of economic efficiency and compressive strength, which are one of the problems. In addition, as starch, if it is used in combination with any one of oxidized starch, anionic starch, cationic starch and amphoteric starch, or in combination, the dispersibility of starch between the layers of wet paper is not clear. Better and more preferred.
ワイヤーパート（抄紙段階）において例えば下側の湿紙上に澱粉の水溶液を設ける手段について、特に好適な手段として用いられるスプレー噴霧するについて、まず、スプレー噴霧は、１流体又は気‐液の２流体スプレーを用いるのが好ましい。このスプレー噴霧におけるノズル径は、例えば未糊化の澱粉で孔が閉塞しないものを選べば良く、０．５〜２．５ｍｍ径、好ましくは０．８〜１．５ｍｍ径のノズルを適宜選択して用いる。このようなスプレーガンは、湿紙幅方向に一列設けられても良いし、多系列設けられても良く、湿紙の表面に均一に噴霧できるように工夫される。スプレーの圧力は、供給する空気圧にて微細な飛沫が得られれば特に制約はないが、０．３〜３５ｋｇ／ｃｍ2、好ましくは２．０〜１０ｋｇ／ｃｍ2とすることができる。吐出量は、０．４〜４．０リットル／分、好ましくは１．０〜３．０リットル／分である。また、澱粉は、未糊化の澱粉が好ましく、未糊化でパルプ繊維間に歩留易い粒子径の例えば、平均粒子径１２．０〜１６．０μｍのコーンスターチが好ましく、平均粒子径が６．０μｍ未満と小さいコメ澱粉はウエットエンドにおいて脱水とともに紙層を形成する繊維間に澱粉粒子が流入し、湿紙と湿紙に重ねあわされる上層との結合力を十部に得難い問題が生じやすく、平均粒子径が２０．０μｍを超えるコムギ澱粉や甘藷、馬鈴薯澱粉はウエットエンドにおいて表層に留まるものの、粒子径が大きいことが原因と推察される層間強度のバラツキや紙層間への澱粉粒子の含有量（流入）が少ないため、平均粒子径が６．０μ未満と小さいコメ澱粉と同様に紙層間強度向上にさほど寄与しない。また、コーンスターチは澱粉粒径が多角形であり、紙層を形成する際にパルプ繊維への絡み合いも多くなる点からもコーンスターチが好ましい。 In the wire part (paper making stage), for example, a spray spray used as a particularly suitable means for providing an aqueous starch solution on the lower wet paper, first, spray spray is a one-fluid or gas-liquid two-fluid spray. Is preferably used. The nozzle diameter in this spraying may be selected from, for example, non-gelatinized starch that does not clog the pores. A nozzle having a diameter of 0.5 to 2.5 mm, preferably 0.8 to 1.5 mm, is appropriately selected. Use. Such spray guns may be provided in a single row in the width direction of the wet paper web, or may be provided in multiple rows, and are devised so as to be sprayed uniformly on the surface of the wet paper web. The pressure of the spray is not particularly limited as long as fine droplets can be obtained with the supplied air pressure, but can be 0.3 to 35 kg / cm 2 , preferably 2.0 to 10 kg / cm 2 . The discharge rate is 0.4 to 4.0 liters / minute, preferably 1.0 to 3.0 liters / minute. Further, the starch is preferably ungelatinized starch, preferably corn starch having an average particle diameter of 12.0 to 16.0 μm, for example, having a particle diameter that is easy to retain between pulp fibers without gelatinization, and an average particle diameter of 6. Rice starch smaller than 0 μm tends to cause a problem that starch particles flow between fibers forming a paper layer together with dehydration at the wet end, and it is difficult to obtain a sufficient binding force between the wet paper and the upper layer superimposed on the wet paper. Wheat starch, sweet potato, and potato starch with an average particle size exceeding 20.0 μm remain on the surface layer at the wet end, but the variation in the interlaminar strength presumed to be due to the large particle size and the content of starch particles between the paper layers Since there is little (inflow), it does not contribute so much to the improvement of paper interlayer strength like rice starch having an average particle diameter of less than 6.0 μm. Corn starch is preferably corn starch because the starch particle size is polygonal, and the entanglement with the pulp fibers increases when the paper layer is formed.
湿紙の形成において、微細繊維が白水とともに抜け落ち難い湿紙の表面は、白水とともに抜け易い湿紙の裏面と比較して微細繊維が多く分布するため、物理的外圧を加えることなく例えばスプレー噴霧にて設けるコーンスターチ等の未糊化澱粉の水性懸濁液を表層に留めやすい。好適には、未糊化の澱粉の水性懸濁液をスプレー噴霧した表層に更に上側の湿紙を重ね、複数層の層構成後に、プレスパートでの脱水による強制的な脱水を付与することで、表層や湿紙層間に付与された未糊化の澱粉の水性懸濁液が湿紙層中に拡散し、１００℃以上の熱が加えられるドライヤーにて糊化することで、紙層間及び紙層内部の強度向上を図ることができる。 In the formation of wet paper, the surface of the wet paper, where fine fibers are difficult to come off with white water, is distributed more than the back of the wet paper, which is easy to come off with white water. It is easy to keep an aqueous suspension of non-gelatinized starch such as corn starch. Preferably, the upper wet paper is further layered on the surface layer sprayed with an aqueous suspension of non-gelatinized starch, and forced dehydration by dehydration in the press part is applied after the layer construction of multiple layers. The aqueous suspension of non-gelatinized starch applied between the surface layer and the wet paper layer diffuses into the wet paper layer and is gelatinized with a dryer to which heat of 100 ° C. or more is applied. The strength inside the layer can be improved.
ここで、湿紙間に澱粉の水溶液が設けられた積層体が形成するにあたり、湿紙を２層積層する場合は、下側の湿紙（下層）上に好適には未糊化の澱粉水溶液のスプレー噴霧を行い、上側の湿紙（上層）を積層するのが好ましい。他方、湿紙を３層以上の複数積層する場合は、上下に隣接する下側の湿紙及び上側の湿紙が複数存在することになるが、少なくともいずれか１つの下側の湿紙を対象として、好ましくは全ての下側の湿紙を対象として澱粉水溶液のスプレー噴霧を行うのが好ましい。 Here, when forming a laminated body in which an aqueous solution of starch is provided between wet papers, when two layers of wet paper are laminated, an ungelatinized starch aqueous solution is preferably formed on the lower wet paper (lower layer). It is preferable to laminate the upper wet paper (upper layer) by spraying. On the other hand, when laminating a plurality of wet paper webs of three or more layers, there are a plurality of lower wet paper webs and upper wet paper webs adjacent to each other, but at least one of the lower web papers is targeted. As a result, it is preferable to spray the starch aqueous solution on all lower wet papers.
スプレー方式の塗布（噴霧）設備にて用いられる未糊化澱粉の水溶性懸濁液の調製方法は、特に限定されないが、好ましくは次のとおりである。すなわち、まず、未糊化の生澱粉を水に分散して、好ましくは最終澱粉糊液の濃度が１０％以上になるように約１０〜２０％未満の濃度の水性懸濁液とする。本発明で云う「未糊化澱粉」とは、加熱処理等により生澱粉を糊化する処理を行っていない未処理の澱粉を言う。
未糊化澱粉の水溶性懸濁液のスプレーによる塗布（噴霧）は、上下に隣接する湿紙の一方の湿紙の表面（第１ワイヤー面）、好ましくは裏面（第２ワイヤー面）にもスプレーすることが可能であるが、本発明の課題である圧縮強度の高い中芯を得るに好適な構成においては、ワイヤーパートにおけるインレット吐出直後から湿紙を重ね合わせる間、好ましくは水切れ線後に噴霧されることが好適である。
Although the preparation method of the water-soluble suspension of the non-gelatinized starch used with the application | coating (spraying) equipment of a spray system is not specifically limited, Preferably it is as follows. That is, first, ungelatinized raw starch is dispersed in water, and preferably an aqueous suspension having a concentration of less than about 10 to 20% so that the final starch paste solution has a concentration of 10% or more. The “ungelatinized starch” as used in the present invention refers to untreated starch that has not been subjected to a treatment for gelatinizing raw starch by heat treatment or the like.
Application (spraying) of a water-soluble suspension of ungelatinized starch by spraying is also applied to the surface (first wire surface), preferably the back surface (second wire surface) of one of the adjacent wet paper webs. In a configuration suitable for obtaining a core having high compressive strength, which is a subject of the present invention, it is possible to spray, but during the overlap of wet paper immediately after the outlet discharge in the wire part, preferably after the water break line It is preferred that
以上のようにして湿紙が積層されて形成された積層体は、両面に糊化澱粉の水溶液を塗布するが、この塗布は、コーターパートにおいてフィルムトランスファー方式のゲートロールコーターを用いて行うのが好ましい。塗布手段としては、２ロールサイズプレス方式等の各種のサイズプレスやコーターが考えられるが、湿紙表面への輪郭塗被性に優れ、内部への浸透を抑え、表裏面強度の向上が得られ易いこと、少量の塗布量でも表裏両面に被膜を形成し易いこと、などから、フィルムトランスファー方式が好適であり、中でもゲートロールコーターが好適である。
上記の「糊化澱粉」とは、その加工方法の如何を問わず、部分的に、あるいはほぼ完全に糊化された澱粉を言う。
The laminated body formed by laminating wet paper as described above applies an aqueous solution of gelatinized starch on both sides, and this coating is performed using a film transfer type gate roll coater in the coater part. preferable. As the application means, various size presses and coaters such as a two-roll size press method are conceivable, but it is excellent in contour coating on the wet paper surface, suppresses penetration into the interior, and improves the strength of the front and back surfaces. The film transfer method is preferable because it is easy and a film can be easily formed on both the front and back surfaces even with a small coating amount, and a gate roll coater is particularly preferable.
The above-mentioned “gelatinized starch” refers to starch that is partially or almost completely gelatinized regardless of the processing method.
この際に使用する澱粉糊液の濃度は、先のスプレー方式の未糊化澱粉の水溶性懸濁液の濃度より高く、２０〜２５％、好ましくは２２〜２４％である。スプレー方式の未糊化澱粉の水溶性懸濁液の濃度より高くすることで、スプレー方式の未糊化澱粉の水溶性懸濁液による層間強度向上と、積層体表裏面における強度向上の２方面から中芯の強度を総合的に向上させることができる。澱粉糊液の濃度が２０％未満では澱粉糊液が塗布された積層体（中芯原紙）の圧縮強度の増大が十分でなく、他方、２５％を超えると実質上これを得るために必要な高濃度の水性懸濁液の調整が困難であり、ドライヤー表面への貼り付きや、設備汚れの原因になる。
また、本形態で使用される澱粉糊液の粘度は、５〜１５ＣＰ（Ｂ型粘度計、６０ｒｐｍ、塗布時の温度）であるのが好ましく、６．０〜１０．０ＣＰであるのがより好ましい。澱粉糊液の粘度が１５ＣＰを超えるとゲートロールコーターでの塗布時に塗液の転写性が低下するため、塗布速度の低下を免れず、生産性の点で満足とは言い難く、他方、５ＣＰ未満では必要とする濃度が得られず、必要量を塗布するには乾燥能力を向上させる必要が有り、生産性低下の原因になるため好ましくない。
The concentration of the starch paste used at this time is 20 to 25%, preferably 22 to 24%, which is higher than the concentration of the water-soluble suspension of the non-gelatinized starch by the previous spray method. By increasing the concentration of spray-type non-gelatinized starch in water-soluble suspension, it improves the interlayer strength by spray-type non-gelatinized starch in water-soluble suspension and improves the strength of the laminate on the front and back sides. Therefore, the strength of the core can be improved comprehensively. If the starch paste concentration is less than 20%, the laminate (core base paper) coated with the starch paste is not sufficiently increased in compression strength. On the other hand, if it exceeds 25%, it is substantially necessary to obtain this. It is difficult to prepare a high concentration aqueous suspension, which may cause sticking to the dryer surface and soiling of equipment.
Moreover, it is preferable that the viscosity of the starch paste liquid used by this form is 5-15CP (B type viscometer, 60 rpm, the temperature at the time of application | coating), and it is more preferable that it is 6.0-10.0 CP. . If the viscosity of the starch paste exceeds 15 CP, the transferability of the coating liquid is reduced when applied with a gate roll coater, so the reduction in coating speed is unavoidable, and it is difficult to say that the productivity is satisfactory. On the other hand, less than 5 CP However, the required concentration cannot be obtained, and in order to apply the required amount, it is necessary to improve the drying ability, which is not preferable because it causes a decrease in productivity.
本形態の中芯は、ＪＩＳ Ｐ ８１２６：２００５「紙及び板紙‐圧縮強さ試験方法‐リングクラッシュ法」に準拠した横方向（ＣＤ）の比圧縮強さが１８０Ｎ・ｍ2／ｇ以上、好ましくは１９０〜２２０Ｎ・ｍ2／ｇとされている。比圧縮強さが１８０Ｎ・ｍ2／ｇ未満であると、段ボールシートを製函した際の十分なケース強度が得られない問題が生じる。比圧縮強さの調節は、例えば、繊維配向性、澱粉塗布量、原料古紙の選択などを適宜組み合わせ調節することによって、行うことができる。
本形態の中芯は、含有される澱粉総量が５．０〜１５．０ｇ／ｍ2とされているのが好ましく、８．０〜１５．０ｇ／ｍ2とされているのがより好ましい。
The core of the present embodiment has a specific compressive strength in the transverse direction (CD) of 180 N · m 2 / g or more in accordance with JIS P 8126: 2005 “Paper and paperboard—Compression strength test method—Ring crush method”, preferably Is 190 to 220 N · m 2 / g. When the specific compressive strength is less than 180 N · m 2 / g, there arises a problem that sufficient case strength cannot be obtained when a corrugated cardboard sheet is boxed. The specific compressive strength can be adjusted, for example, by appropriately adjusting and adjusting fiber orientation, starch coating amount, raw material waste paper selection, and the like.
Center core of the present embodiment is preferably a starch amount contained is a 5.0~15.0g / m 2, and more preferably is a 8.0~15.0g / m 2.
本発明における、フィルムトランスファー方式に用いられる澱粉には、分子量が３００万未満で、かつ塗工液（澱粉糊液）の濃度が３５％、温度４０℃での粘度が８５ｃｐ以下、好ましくは１０〜８０ｃｐ、より好ましくは３０〜７５ｃｐの化工澱粉が用いられる。
特に７００ｍ／分以上の高速抄紙になると澱粉粘度が低い場合には「ミスト」の問題、粘度が高いと「粘性で断紙」という問題がある。一方、本発明では生産性に優れるフィルムトランスファー方式を用い、なおかつ軽量であっても強度に優れる軽量中芯とするため、澱粉の水溶液を多く塗布したい。ところが、通常ゲートロールで澱粉の水溶液を塗布できる塗布量は０．５〜２ｇ／ｍ2程度である。本発明は以下に詳述する特定の澱粉の水溶液を用いることにより、生産性に優れるフィルムトランスファー方式を用いながらも、圧縮強度に優れた中芯原紙を得ることができた。
In the present invention, the starch used for the film transfer system has a molecular weight of less than 3 million, a coating solution (starch paste) concentration of 35%, and a viscosity at a temperature of 40 ° C. of 85 cp or less, preferably 10 to A modified starch of 80 cp, more preferably 30-75 cp is used.
In particular, when high-speed papermaking at 700 m / min or higher, there is a problem of “mist” when the starch viscosity is low, and there is a problem of “paper cut due to viscosity” when the viscosity is high. On the other hand, in the present invention, it is desired to apply a large amount of starch aqueous solution in order to use a film transfer method having excellent productivity and to obtain a lightweight core having excellent strength even if light. However, the coating amount which can apply | coat the aqueous solution of starch normally with a gate roll is about 0.5-2 g / m < 2 >. In the present invention, by using an aqueous solution of a specific starch described in detail below, a core base paper excellent in compressive strength can be obtained while using a film transfer method excellent in productivity.
澱粉としては、例えば酸化澱粉、カチオン化澱粉、カルボキシメチル化澱粉、α化澱粉、リン酸エステル化澱粉、エステル変性澱粉、尿素リン酸変性澱粉、未変性澱粉等、公知の種々のものを単独で又は２種以上を混合して用いることができる。
しかしながら、カルボキシメチルデンプン（アニオン性）、ヒドロキシアルキルデンプン（ノニオン性）、リン酸デンプン（アニオン性）等の変性澱粉は、紙中に浸透しながら、引張り強度や表面強度を向上させる効果を有するものの、中性またはアニオン性を示すため、アニオン性を呈するパルプ繊維表面への定着性に劣り、被膜性が低いという問題がある。したがって、公知の種々の澱粉の中でも特に、アニオン性を呈するパルプ繊維表面への定着性が高い、カチオン性の澱粉を用いることが好ましい。また、カチオン性の澱粉を用いると、パルプ繊維表面への定着性が向上し、被膜性に優れ貼合性も向上させることができる。
また、澱粉は、酸化澱粉を好適に用いることが出来るが、エステル変性澱粉を用いることがより好ましい。エステル変性澱粉であると、無機微粒子の定着性をより向上させることができると共に、コルゲータで中芯原紙の段繰りを行う際、段ロールとの摩擦係数を下げることができるので、中芯原紙の軽量化に伴い紙の引張強度や、伸び率の絶対値が低くなっても、段割れが発生しない。
As the starch, for example, various known ones such as oxidized starch, cationized starch, carboxymethylated starch, pregelatinized starch, phosphate esterified starch, ester-modified starch, urea phosphate-modified starch, and unmodified starch are used alone. Or 2 or more types can be mixed and used.
However, modified starches such as carboxymethyl starch (anionic), hydroxyalkyl starch (nonionic), and phosphate starch (anionic) have the effect of improving tensile strength and surface strength while penetrating into paper. Since it exhibits neutrality or anionic property, there is a problem that the fixing property to the pulp fiber surface exhibiting anionic property is inferior and the film property is low. Therefore, among various known starches, it is preferable to use a cationic starch that has a high fixability to the surface of an anionic pulp fiber. Moreover, when cationic starch is used, the fixability to the pulp fiber surface is improved, the coating property is excellent, and the bonding property can be improved.
Moreover, although oxidized starch can use a starch suitably, it is more preferable to use ester-modified starch. When the ester-modified starch is used, the fixability of the inorganic fine particles can be further improved, and when the core base paper is fed with a corrugator, the friction coefficient with the corrugated roll can be lowered. Even if the paper's tensile strength and the absolute value of the elongation rate decrease with the weight reduction, no step cracks occur.
エステル変性澱粉において、そのエステル化の度合は特に制約されないが、導入されるエステル結合の平均数で、グルコース単位当り１〜３、好ましくは１〜２のものが好適である。このようなエステル変性澱粉の中でも、ヒドロキシエステル化澱粉が、原料澱粉に酸化処理を施し、カルボキシメチル基をヒドロキシエチル基へ還元反応させることにより容易にかつ安価に得ることができるので好ましい。より好適には、エステル変性された澱粉の末端基に疎水性基を導入した、疎水性基含有エステル変性タピオカ澱粉が好適に用いられる。さらに好適には、チキソトロピカルな挙動を示すエステル変性澱粉が用いられる。すなわち、このようなチキソトロピック性を有するエステル変性澱粉は、末端基にカルボン酸（−ＣＯＯＨ）構造を有し、中性領域において、−ＣＯＯ−のようにイオン化することで水素結合による繋がりを確保できず、反発性を示す。従って、塗工において流動性を示し、基紙中に浸透しにくいため、基紙の表面に高い被膜性を呈するので好ましい。 In the ester-modified starch, the degree of esterification is not particularly limited, but the average number of ester bonds to be introduced is preferably 1 to 3, and preferably 1 to 2 per glucose unit. Among such ester-modified starches, hydroxyesterified starch is preferable because it can be easily and inexpensively obtained by subjecting the raw material starch to an oxidation treatment and reducing the carboxymethyl group to a hydroxyethyl group. More preferably, a hydrophobic group-containing ester-modified tapioca starch in which a hydrophobic group is introduced into the terminal group of the ester-modified starch is preferably used. More preferably, an ester-modified starch that exhibits thixotropic behavior is used. That is, such an ester-modified starch having thixotropic properties has a carboxylic acid (—COOH) structure at the end group, and in a neutral region, ionization like —COO— secures a bond by hydrogen bonding. It is not possible to show resilience. Accordingly, it exhibits fluidity in coating and is difficult to permeate into the base paper, which is preferable because it exhibits a high coatability on the surface of the base paper.
このようなエステル変性澱粉の原料についても特に限定されるものではないので、例えば、小麦澱粉、馬鈴薯澱粉、トウモロコシ澱粉、甘薯澱粉、タピオカ澱粉、サゴ澱粉、米澱粉、モチトウモロコシ粉、高アミロース含量、トウモロコシ澱粉などの未処理澱粉、小麦粉、タピオカ澱粉、コーンフラワー、米粉等の澱粉含有物、あるいはこのような未処理澱粉及び澱粉含有物の酸化、酸処理化等を行った処理澱粉等、種々の澱粉含有物を用いることができる。これらの中でも特に、タピオカ澱粉を主原料としてエステル変性させた１−オクテニルコハク酸エステル化澱粉が、粘性、被覆性、被膜弾力性、伸展性の面で他の澱粉よりも秀でているので好ましい。さらに、ポリビニルアルコールと組み合わせて用いることで、コルゲータで中芯原紙の成形時における段割れの発生をさらに防止することができる。 Since the raw material of such ester-modified starch is not particularly limited, for example, wheat starch, potato starch, corn starch, sweet potato starch, tapioca starch, sago starch, rice starch, waxy corn flour, high amylose content, Various types of starch such as untreated starch such as corn starch, starch-containing materials such as wheat flour, tapioca starch, corn flour and rice flour, or treated starch obtained by oxidizing, acid-treating, etc. such untreated starch and starch-containing material Starch-containing materials can be used. Among these, 1-octenyl succinic esterified starch, which is ester-modified using tapioca starch as a main raw material, is preferable because it is superior to other starches in terms of viscosity, coatability, film elasticity, and extensibility. Furthermore, by using it in combination with polyvinyl alcohol, it is possible to further prevent the occurrence of step cracks at the time of forming the core raw paper with a corrugator.
本発明に用いられる澱粉は、ＴＡＰＰＩ Ｔ４１９ ｏｍ−９１に基づく紙中澱粉量に準拠した分析値で、澱粉が２．５〜１５ｇ／ｍ2、好適には３．０〜１０ｇ／ｍ2、更に好適には４．０〜１０ｇ／ｍ2含有されるように、中芯原紙の表裏面に塗布設備にて塗布される。これにより、本発明の中芯原紙を、貼合性（貼合適性）や離解性、経済性を損なわずに、圧縮強さを改善した段ボール用の中芯原紙を得ることができる。
なお、澱粉の塗布含有量が２．５ｇ／ｍ2未満では、圧縮強度の維持や紙粉の発生を抑制することが困難であり、一方、澱粉の塗布含有量が１５ｇ／ｍ2を超えると、既存のフィルムトランスファー方式に代表される塗布設備での塗布が困難であり操業性を大きく低下させると共に、抄紙機の毀損、コスト負担が大きくなる。
なお、通常ゲートロールで水溶性高分子を塗布できる塗布量は０．５〜２ｇ／ｍ2程度である。本発明においては、水溶性高分子として、濃度が３５％以上で、温度４０℃における粘度が８５ｃｐ以下を示す澱粉（本件発明における実施例においては５〜１５ＣＰ）を主成分に用いることにより、２．５ｇ／ｍ2以上の塗布を可能にし、生産性に優れる また、澱粉の水溶液には、本発明の効果に影響のない範囲内で、澱粉のほか、ポリビニルアルコール（ＰＶＡ）、ポリアクリルアミド（ＰＡＭ）等を用いることができる。さらに、例えばサイズ剤、填料分散剤、ｐＨ調整剤、増粘剤、流動性改良剤、消泡剤、抑泡剤、離型剤、浸透剤、着色染料、着色顔料、紫外線吸収剤、酸化防止剤、防腐剤、防バイ剤、耐水化剤、蛍光消去剤等の公知の種々の添加剤を、単独で、あるいは２種以上を混合して添加しても良い。
The starch used in the present invention is an analytical value based on the amount of starch in paper based on TAPPI T419 om-91, and the starch is 2.5 to 15 g / m 2 , preferably 3.0 to 10 g / m 2 , It is preferably applied to the front and back surfaces of the core core paper by a coating facility so as to contain 4.0 to 10 g / m 2 . Thereby, the core base paper for corrugated board which improved the compressive strength can be obtained, without impairing bonding property (bonding suitability), disaggregation property, and economical efficiency.
If the starch coating content is less than 2.5 g / m 2 , it is difficult to maintain the compressive strength and suppress the generation of paper powder, while the starch coating content exceeds 15 g / m 2. In addition, it is difficult to apply the coating equipment represented by the existing film transfer system, and the operability is greatly lowered, and the paper machine is damaged and the cost is increased.
In addition, the application quantity which can apply | coat water-soluble polymer with a normal gate roll is about 0.5-2 g / m < 2 >. In the present invention, as a water-soluble polymer, a starch having a concentration of 35% or more and a viscosity at a temperature of 40 ° C. of 85 cp or less (5 to 15 CP in the examples of the present invention) is used as a main component. Application of 5 g / m 2 or more is possible, and the productivity is excellent. In addition, starch aqueous solution, polyvinyl alcohol (PVA), polyacrylamide (PAM) can be used in the starch aqueous solution within the range not affecting the effect of the present invention. ) Etc. can be used. Further, for example, sizing agent, filler dispersing agent, pH adjusting agent, thickening agent, fluidity improving agent, antifoaming agent, antifoaming agent, mold release agent, penetrating agent, coloring dye, coloring pigment, UV absorber, antioxidant Various known additives such as additives, antiseptics, antibacterial agents, water-proofing agents, and fluorescent quenchers may be added alone or in admixture of two or more.
以上によると、貼合性や離解性、経済性を損なわずに圧縮強度が飛躍的に増大した中芯となる。ここでこれらの効果が発現する機構について説明する。
（１）比較的、澱粉粒子の大きい未糊化の澱粉を、抄紙機のワイヤーパートにおいてスプレー塗布することで、湿潤紙層の極表面に澱粉を高濃度で設けることが出来る。特に、ワイヤーパートにおけるインレット吐出直後から湿紙を重ね合わせる間、好ましくは水切れ線後に噴霧することで、あたかも湿潤紙層表面を被覆するように未糊化の澱粉層を設けることができる。なお、水切れ線とは、スライスリップ出口直後から固形分濃度７％程度になる水切れ線（Ｄｒｙ Ｌｉｎｅ）を意味する。
（２）未糊化の澱粉は、抄紙工程のプレス工程での更なる脱水時に、物理的な圧力で湿紙層中に移動し、１００℃以上の高温に晒される乾燥工程において糊化し、湿紙間の強度向上とともに、湿紙層の強度向上を図ることができる。
（３）特に本形態においては、少なくとも２層の層構成を有する中芯であり、各紙層間に前記（１）及び（２）の構成を設けることで、その効果は一層向上する。
（４）更に本形態においては、予備乾燥された積層体の表裏面に、フィルムトランスファー方式で、糊化した澱粉水溶液を塗布する。フィルムトランスファー方式は、従来慣用的に用いられてきた２ロールサイズプレスと異なり、紙内部まで糊液を含浸させることなく、積層体の表裏面に対し糊化澱粉を高濃度で輪郭塗工することが可能であり、スプレーで塗付した未糊化澱粉による強度向上との相乗効果にて飛躍的に圧縮強度を向上させた中芯となる。
According to the above, it becomes the core whose compressive strength increased dramatically without impairing the bonding property, disaggregation property, and economical efficiency. Here, the mechanism of these effects will be described.
(1) By applying a non-gelatinized starch having relatively large starch particles on the wire part of a paper machine, the starch can be provided at a high concentration on the extreme surface of the wet paper layer. In particular, an ungelatinized starch layer can be provided as if covering the surface of the wet paper layer by superimposing the wet paper immediately after discharging the inlet in the wire part, preferably by spraying after the water break line. In addition, a water break line means the water break line (Dry Line) which becomes about 7% of solid content concentration immediately after a slice lip exit.
(2) Ungelatinized starch is transferred into the wet paper layer by physical pressure during further dehydration in the press process of the papermaking process, and gelatinized in the drying process exposed to a high temperature of 100 ° C or higher. It is possible to improve the strength of the wet paper layer as well as the strength of the paper.
(3) Especially in this embodiment, it is a core having a layer structure of at least two layers, and the effects are further improved by providing the structures (1) and (2) between the paper layers.
(4) Furthermore, in this embodiment, the gelatinized starch aqueous solution is applied to the front and back surfaces of the pre-dried laminate by a film transfer method. Unlike the two-roll size press that has been conventionally used, the film transfer system is used to apply a high-concentration coating of gelatinized starch on the front and back surfaces of the laminate without impregnating the paste inside the paper. It is possible to achieve a core with dramatically improved compressive strength due to a synergistic effect with strength improvement by ungelatinized starch applied by spraying.
本発明に係る中芯原紙の効果を確認するため、以下のような各種の試料を作製し、これらの各試料に対する品質を評価する試験を行った。なお、本実施例は、本発明を限定するものではなく、特許請求の範囲を逸脱しない範囲において、適宜その構成を変更することができることはいうまでもない。
本発明に係る２５種類の中芯原紙（これを「実施例１」から「実施例２５」とする）を表１に示すような構成で作製し、またこれらの実施例１から実施例２５と比較検討するための１０種類の中芯原紙（これを「比較例１」から「比較例１０」とする）を表２に示すような構成で作製した。
In order to confirm the effect of the core raw paper according to the present invention, the following various samples were prepared, and a test for evaluating the quality of each sample was performed. Note that the present embodiment does not limit the present invention, and it is needless to say that the configuration can be changed as appropriate without departing from the scope of the claims.
Twenty-five types of core raw papers (referred to as “Example 1” to “Example 25”) according to the present invention were prepared as shown in Table 1, and these Examples 1 to 25 and Ten types of core base papers (referred to as “Comparative Example 1” to “Comparative Example 10”) for comparative examination were prepared as shown in Table 2.
まず、実施例１として、段ボール古紙６０重量％と、雑誌古紙４０重量％となるように配合した後に、ダブルディスクリファイナーで原料パルプを叩解調整し、離解パルプフリーネスが３７６ｃｃになる原料パルプスラリーを作製した。次に、体積平均粒径が１４．０μｍのコーンスターチを水道水に懸濁分散させ、澱粉水溶液濃度１２．６％の湿紙上に設ける澱粉水溶液を調整した。更に、ゲートロールで設ける澱粉水溶液を調整した。このゲートロールで設ける澱粉水溶液は、主成分として、日本コーンスターチ社製の酸化澱粉（ＳＫ−２０）を用いた。
まず、このように作製した原料パルプスラリーを、原料パルプの濃度が１．０％になるように濃度調整を行い、単層の湿紙を形成し、その上に澱粉の水溶液をスプレー塗布した後、更に湿紙上に湿紙を抄き合わせ、２層の積層体をとし、その後、シュープレス方式で湿紙を搾水し、プレドライヤーで乾燥させる。次いで、ゲートロールにより、上述した澱粉水溶液を、湿紙の表裏面に塗布し、乾燥させて、坪量が２１４ｇ／ｍ2である中芯を得る。なお、抄速は８００ｍ／分である。
実施例２以降及び比較例は、実施例１を元に、表に記載の条件を当てはめ、条件を設定して実施した。また、市販の中芯Ａ〜Ｃについても、各種試験を行った。
First, as Example 1, after blending so as to be 60% by weight of waste corrugated paper and 40% by weight of waste magazine paper, the raw pulp is beaten and adjusted with a double disc refiner to produce a raw pulp slurry having a disaggregation pulp freeness of 376 cc. did. Next, corn starch having a volume average particle diameter of 14.0 μm was suspended and dispersed in tap water to prepare an aqueous starch solution provided on wet paper having a starch aqueous solution concentration of 12.6%. Furthermore, the starch aqueous solution provided with a gate roll was adjusted. The starch aqueous solution provided by the gate roll used oxidized starch (SK-20) manufactured by Nippon Corn Starch Co., Ltd. as the main component.
First, after adjusting the concentration of the raw material pulp slurry thus prepared so that the concentration of the raw material pulp is 1.0%, forming a single-layer wet paper, and spraying an aqueous starch solution thereon Further, wet paper is made on the wet paper to form a two-layer laminate, and then the wet paper is squeezed with a shoe press method and dried with a predryer. Next, the starch aqueous solution described above is applied to the front and back surfaces of the wet paper by a gate roll and dried to obtain a core having a basis weight of 214 g / m 2 . The paper making speed is 800 m / min.
In Examples 2 and onwards and Comparative Examples, the conditions described in the table were applied based on Example 1, and the conditions were set. Various tests were also conducted on commercially available cores A to C.
各種試験は、温度２０℃、相対湿度６５％の条件で調湿後、坪量、澱粉塗布量、比破裂度及び比圧縮強さ等を測定し、表１及び表２に示した。測定方法は、次のとおりとした。
坪量：ＪＩＳ Ｐ ８１２４：１９９８に準拠
澱粉含有量（総量）：ＴＡＰＰＩ Ｔ４１９ ｏｍ−９１に基づく紙中澱粉量に準拠
裂断長：ＪＩＳ Ｐ ８１１３：１９９５に準拠
圧縮強さ及び比圧縮強さ：ＪＩＳ Ｐ ８１２６：２００５ リングクラッシュ法に準拠
密度・厚さ：ＪＩＳ Ｐ ８１１８：１９９８に準拠
離解フリーネス：ＪＩＳ Ｐ ８２２０：１９９８に準拠して、離解した中芯原紙を、ＪＩＳ Ｐ ８１２１：１９９５に準拠にして、ろ水度（フリーネス）を測定した。
段ボール−垂直圧縮試験（耐圧強度）：ＪＩＳ Ｚ ０４０３−２に準拠にして測定。
初期接着強度：下記条件にて段シートを作成し、ＪＩＳ Ｚ ０４０２：１９９５に準拠し、５０×８５ｍｍの大きさの片面段ボールをロードセルの付いたピンテスターにセットする。その上にクラフトライナーを置き、自重１．５ｋｇの熱板（１２０℃）により、１０秒間圧着する。圧着後、直ちにライナと片面段ボールを剥がし、そのときの強度を初期接着強度として、ロードセルによって測定した。
＜段シート加工＞
・三菱重工製コルゲータ
・シングルフェーサー ６０Ｈ
・加工速度１５０ｍ／分
・のり塗工量：表３．２ｇ／ｍ2、裏５．０ｇ／ｍ2
・濃度 ：表３．２％、裏３．０％
・のり ：日本澱粉社製のローコンスを使用
離解性：試料を３．０ｃｍ角に裁断し、これをＴＡＰＰＩ標準離解機に２％濃度となるように投入した後、３，０００ｒｐｍで１５分間離解した。こうして得られた試料分散液からＴＡＰＰＩ角型シートマシンを用い、米坪量が７０ｇ／ｍ2となるように手抄きシートを作製、脱水、乾燥した。目視にて、シート中に未離解物が見られないものを離解性良好、未離解物が残存しているものを離解性不良とした。評価基準は、◎：シート中に未離解物が全く見られない、○：シート中に未離解物が見られるが、許容範囲内、△：シート中に未離解物が見られる、×：シート中に未離解物が著しく残存している、をそれぞれ表す。
Various tests were carried out under conditions of a temperature of 20 ° C. and a relative humidity of 65%, and the basis weight, the starch coating amount, the specific bursting strength, the specific compressive strength, and the like were measured and are shown in Tables 1 and 2. The measurement method was as follows.
Basis weight: Starch content in accordance with JIS P 8124: 1998 (total amount): Based on the amount of starch in paper based on TAPPI T419 om-91 Break length: Compressive strength and specific compressive strength in accordance with JIS P 8113: 1995 JIS P 8126: 2005 Conforms to ring crush method Density / thickness: Conforms to JIS P 8118: 1998 Disaggregation freeness: Consolidates the core raw paper disaggregated according to JIS P 8220: 1998, and conforms to JIS P 8121: 1995 The freeness was measured.
Corrugated cardboard-vertical compression test (pressure strength): Measured according to JIS Z 0403-2.
Initial adhesive strength: A corrugated sheet is prepared under the following conditions, and a single-sided cardboard having a size of 50 × 85 mm is set on a pin tester with a load cell in accordance with JIS Z 0402: 1995. A kraft liner is placed thereon, and is crimped by a hot plate (120 ° C.) having a weight of 1.5 kg for 10 seconds. Immediately after crimping, the liner and single-sided cardboard were peeled off, and the strength at that time was used as the initial adhesive strength and measured with a load cell.
<Corrugated sheet processing>
・ Mitsubishi Heavy Industries Corrugator ・ Single Facer 60H
・ Processing speed 150 m / min ・ Glue coating amount: Table 3.2 g / m 2 , Back 5.0 g / m 2
Concentration: Table 3.2%, back 3.0%
-Paste: Uses a low starch made by Nippon Starch Co., Ltd. Disaggregation: The sample was cut into a 3.0 cm square, and this was put into a TAPPI standard disintegrator so as to have a concentration of 2%, and then disaggregated at 3,000 rpm for 15 minutes. . A hand-sheet was prepared from the sample dispersion thus obtained using a TAPPI square sheet machine so that the rice basis weight was 70 g / m 2 , dehydrated and dried. When the undissolved material was not visually observed in the sheet, the disintegration property was good, and when the undissolved material remained, the disintegration property was poor. Evaluation criteria are ◎: no undissolved material is found in the sheet, ○: undissolved material is found in the sheet, but within an acceptable range, Δ: undissolved material is found in the sheet, x: sheet In the figure, undissolved material remains remarkably.
なお、エステル変性澱粉として、ナショナルスターチ社製のＦＩＬＵＭＵＫＯＴＯ３７０を用い、リン酸エステル化澱粉として、日本コーンスターチ社製のＳＫ−３０００を用い、酸化澱粉として、日本コーンスターチ社製のＳＫ−２０を用いた。 Note that FILUMUKOTO 370 manufactured by National Starch was used as the ester-modified starch, SK-3000 manufactured by Nippon Corn Starch was used as the phosphate esterified starch, and SK-20 manufactured by Nippon Corn Starch was used as the oxidized starch.
本発明は、段ボール用の中芯（中しん）原紙として、適用可能である。 The present invention can be applied as a core paper for corrugated cardboard.
Claims (4)
ワイヤーパートにおいて湿紙間に澱粉の水溶液が設けられた積層体が形成され、更にコーターパートにおいて当該積層体の両面に澱粉の水溶液がフィルムトランスファー方式で塗布され、
ＪＩＳ Ｐ ８１２６：２００５「紙及び板紙‐圧縮強さ試験方法‐リングクラッシュ法」に準拠した横方向の比圧縮強さが１８０Ｎ・ｍ2／ｇ以上とされている、
ことを特徴とする段ボール用の中芯原紙。 A core raw paper for corrugated cardboard with a laminated structure consisting of at least two layers, mainly from waste paper pulp,
In the wire part, a laminate in which an aqueous starch solution is provided between the wet papers is formed, and in the coater part, an aqueous starch solution is applied to both sides of the laminate by a film transfer method.
The specific compressive strength in the transverse direction in accordance with JIS P 8126: 2005 “paper and paperboard—compressive strength test method—ring crush method” is 180 N · m 2 / g or more,
A core base paper for cardboard.
Priority Applications (1)
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| JP2007287516A JP2009114572A (en) | 2007-11-05 | 2007-11-05 | Core base paper for corrugated fiberboard |
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| JP2007287516A JP2009114572A (en) | 2007-11-05 | 2007-11-05 | Core base paper for corrugated fiberboard |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013204186A (en) * | 2012-03-28 | 2013-10-07 | Nippon Paper Industries Co Ltd | Core base paper |
| JP2021134449A (en) * | 2020-02-27 | 2021-09-13 | 北越コーポレーション株式会社 | Manufacturing method of corrugated cardboard middle core base paper |
| US11284676B2 (en) | 2012-06-13 | 2022-03-29 | John C. S. Koo | Shoe having a partially coated upper |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51143707A (en) * | 1975-06-02 | 1976-12-10 | Japan Maize Prod | Quality improving method of cardboard |
| JPS5711295A (en) * | 1980-06-16 | 1982-01-20 | Nisshin Flour Milling Co | Cardboard with increased paper strength and method |
| JPH0726492A (en) * | 1993-07-12 | 1995-01-27 | Nitta Ind Corp | Sheet material excellent in formability |
| JPH09291103A (en) * | 1996-04-25 | 1997-11-11 | Sanwa Kosan Kk | Papermaking starch |
| JPH1060799A (en) * | 1996-06-07 | 1998-03-03 | United Catalysts Inc | Coating material for paper and paperboard containing starch and smectite type clay |
| JPH10195115A (en) * | 1996-12-27 | 1998-07-28 | Nippon P M C Kk | Emulsion composition, its production, paper making additive and paper containing the additive |
| JP2000336592A (en) * | 1999-06-01 | 2000-12-05 | Oji Paper Co Ltd | Corrugating medium for corrugated fiberboard |
| JP2002194694A (en) * | 2000-12-22 | 2002-07-10 | Oji Paper Co Ltd | Method for producing base board |
| JP2002294595A (en) * | 2001-01-30 | 2002-10-09 | Hymo Corp | Method for producing paperboard |
| JP2005009000A (en) * | 2003-06-17 | 2005-01-13 | Rengo Co Ltd | Paper-coating agent |
| JP2007046179A (en) * | 2005-08-08 | 2007-02-22 | Nippon Paper Industries Co Ltd | Liner and method for producing the same |
| JP2007169821A (en) * | 2005-12-21 | 2007-07-05 | Nippon Shokuhin Kako Co Ltd | Method for producing combination board |
| JP2007177331A (en) * | 2005-12-26 | 2007-07-12 | Daio Paper Corp | Method for producing corrugating medium base paper for corrugated board and corrugating medium base paper for corrugated board |
| JP2007186832A (en) * | 2006-01-16 | 2007-07-26 | Seiko Pmc Corp | Neutral hardboard |
-
2007
- 2007-11-05 JP JP2007287516A patent/JP2009114572A/en active Pending
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51143707A (en) * | 1975-06-02 | 1976-12-10 | Japan Maize Prod | Quality improving method of cardboard |
| JPS5711295A (en) * | 1980-06-16 | 1982-01-20 | Nisshin Flour Milling Co | Cardboard with increased paper strength and method |
| JPH0726492A (en) * | 1993-07-12 | 1995-01-27 | Nitta Ind Corp | Sheet material excellent in formability |
| JPH09291103A (en) * | 1996-04-25 | 1997-11-11 | Sanwa Kosan Kk | Papermaking starch |
| JPH1060799A (en) * | 1996-06-07 | 1998-03-03 | United Catalysts Inc | Coating material for paper and paperboard containing starch and smectite type clay |
| JPH10195115A (en) * | 1996-12-27 | 1998-07-28 | Nippon P M C Kk | Emulsion composition, its production, paper making additive and paper containing the additive |
| JP2000336592A (en) * | 1999-06-01 | 2000-12-05 | Oji Paper Co Ltd | Corrugating medium for corrugated fiberboard |
| JP2002194694A (en) * | 2000-12-22 | 2002-07-10 | Oji Paper Co Ltd | Method for producing base board |
| JP2002294595A (en) * | 2001-01-30 | 2002-10-09 | Hymo Corp | Method for producing paperboard |
| JP2005009000A (en) * | 2003-06-17 | 2005-01-13 | Rengo Co Ltd | Paper-coating agent |
| JP2007046179A (en) * | 2005-08-08 | 2007-02-22 | Nippon Paper Industries Co Ltd | Liner and method for producing the same |
| JP2007169821A (en) * | 2005-12-21 | 2007-07-05 | Nippon Shokuhin Kako Co Ltd | Method for producing combination board |
| JP2007177331A (en) * | 2005-12-26 | 2007-07-12 | Daio Paper Corp | Method for producing corrugating medium base paper for corrugated board and corrugating medium base paper for corrugated board |
| JP2007186832A (en) * | 2006-01-16 | 2007-07-26 | Seiko Pmc Corp | Neutral hardboard |
Non-Patent Citations (1)
| Title |
|---|
| 紙パルプ技術便覧, vol. 第５版, JPN6012016451, 30 January 1992 (1992-01-30), JP, pages 584, ISSN: 0002188798 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013204186A (en) * | 2012-03-28 | 2013-10-07 | Nippon Paper Industries Co Ltd | Core base paper |
| US11284676B2 (en) | 2012-06-13 | 2022-03-29 | John C. S. Koo | Shoe having a partially coated upper |
| JP2021134449A (en) * | 2020-02-27 | 2021-09-13 | 北越コーポレーション株式会社 | Manufacturing method of corrugated cardboard middle core base paper |
| JP7323481B2 (en) | 2020-02-27 | 2023-08-08 | 北越コーポレーション株式会社 | Manufacturing method of core base paper for corrugated board |
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