JP2013028879A - Method for producing cardboard - Google Patents

Method for producing cardboard Download PDF

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JP2013028879A
JP2013028879A JP2011166268A JP2011166268A JP2013028879A JP 2013028879 A JP2013028879 A JP 2013028879A JP 2011166268 A JP2011166268 A JP 2011166268A JP 2011166268 A JP2011166268 A JP 2011166268A JP 2013028879 A JP2013028879 A JP 2013028879A
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shower water
shower
paper
paperboard
hypochlorite
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Tomomasa Tsuge
智雅 柘植
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OJI MATERIA CO Ltd
Oji Holdings Corp
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OJI MATERIA CO Ltd
Oji Holdings Corp
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Abstract

PROBLEM TO BE SOLVED: To provide cardboard by preventing a defect of formed paper due to a foreign matter called slime or sludge that cannot be prevented only by a slime control in a white water circulation system in a process of cardboard production using un-deinked waste paper pulp as a raw material.SOLUTION: There is provided a method for producing cardboard using un-deinked waste paper as a papermaking raw material in which an aqueous solution including hypochlorous acid or hypochlorite is adjusted to pH5-7 and sprayed as shower water in a mist state or like a shower at a wire part and/or a press part. Further, in the method for producing cardboard, the shower water is adjusted to include hypochlorous acid or hypochlorite in an effective chlorine concentration of 0.5 ppm-2 ppm.

Description

本発明は、未脱墨の古紙パルプを用いる板紙の製造において、スライムやノロといわれる異物の発生を抑制し、成紙欠点を防止した板紙の製造方法に関する。 The present invention relates to a paperboard manufacturing method that suppresses the occurrence of foreign substances called slime and noro in the manufacture of paperboard using undeinked waste paper pulp, and prevents defects in papermaking.

板紙は、抄紙機上で複数の紙層が重ねられたもので、段ボール原紙として包装用資材として使用されており、板紙は、従来から古紙利用が多い製品であるが、近年の古紙パルプは、幾度となく繰り返されるリサイクル処理により、パルプ繊維が疲弊しルンケル比が高くなり、繊維長がリサイクル処理の都度短くなり、これらの古紙パルプを用いた段ボール用ライナーは、圧縮強度が低下する傾向にある。 Paperboard is a paper machine in which multiple paper layers are stacked, and is used as a packaging material as corrugated cardboard, and paperboard has been a product that has been widely used in the past. Through repeated recycling, the pulp fibers become exhausted and the Runkel ratio increases, and the fiber length decreases with each recycling process. Corrugated liners using these waste paper pulps tend to have a lower compressive strength. .

板紙は、主として包装用資材に用いられるため、段ボール用ライナー、中芯原紙には高い強度が求められる。しかるに、古紙のリサイクル処理頻度の高まりに伴う強度の低下に対応するために、バージンパルプの配合比率を上げる手法があるが、近年の環境保護意識の高まり、省資源化の流れに逆行するものであり、また、コストアップも避けられない。 Since paperboard is mainly used for packaging materials, high strength is required for the cardboard liner and the core base paper. However, there is a technique to increase the blending ratio of virgin pulp in order to cope with the decrease in strength due to the increase in the frequency of waste paper recycling, but this is contrary to the recent increase in environmental protection awareness and the trend toward resource saving. There is also an inevitable cost increase.

強度向上を例にとり、古紙を多量に使用しながら、高い圧縮強度を有する段ボール用ライナーを得る方策として、圧縮強度向上のために紙力増強剤を原料パルプ中に添加する方法が行われている。この紙力増強剤として、天然高分子である澱粉や合成高分子であるポリアクリルアミドが汎用されている。 Taking strength improvement as an example, as a measure to obtain a corrugated liner having a high compressive strength while using a large amount of waste paper, a method of adding a paper strength enhancer to the raw material pulp for improving the compressive strength has been performed. . As this paper strength enhancer, starch, which is a natural polymer, and polyacrylamide, which is a synthetic polymer, are widely used.

紙力増強剤は原料パルプ中に含有させる(すなわち内添する)ため、抄紙段階でパルプ繊維に定着しない紙力増強剤の余剰分が白水中に流出し、設備の汚染、排水処理設備の負荷増加(例えばCOD値の増加)、ウエットエンドコントロールの安定性を損なう問題を生じる。最近は資源リサイクルによる環境保護の観点から古紙の種類も増え、その結果として表面塗工層やダンボールの層間接着剤として使用されている澱粉などが溶出して微生物の栄養源となる物質が豊富に存在するようになってきている。また、脱水処理により発生する排水は工程内に自己循環するのが一般的である。
脱墨した古紙パルプではその製造工程中で脱墨処理により、有機物はある程度除去されるが、板紙で使用する未脱墨の古紙は上記薬品が存在しているため、特に、豊富な栄養で増殖した微生物によりスライムが発生したり、配管にノロと呼ばれるツララ状に付着する粘着物が増加している。
Since the paper strength enhancer is contained in the raw material pulp (that is, added internally), excess paper strength enhancer that does not settle on the pulp fibers at the paper making stage flows out into the white water, causing equipment contamination and wastewater treatment equipment load. Increase (for example, increase in COD value) causes problems that impair the stability of the wet end control. Recently, from the viewpoint of environmental protection through resource recycling, the number of used paper has increased, and as a result, starch used as a surface coating layer and interlaminar adhesive for corrugated cardboard is eluted and abundant substances that become nutrients for microorganisms are abundant. It has come to exist. Moreover, the waste water generated by the dehydration process is generally self-circulated in the process.
In the deinked waste paper pulp, organic matter is removed to some extent by the deinking process during the manufacturing process, but the undeinked waste paper used in paperboard contains the above chemicals, so it grows with abundant nutrition. Slime is generated by the microorganisms that have been removed, and the amount of sticky substances adhering to the pipes in a icicle shape is increasing.

スライムやノロは紙切れの原因になり操業トラブルを引き起こす問題がある。また、スラウムやノロは、紙に転移して斑点状の製品欠陥(成紙欠点)が発生する問題がある。特に近年では省資源の立場から白水の循環使用が進んでいるため、スライムやノロによる成紙欠点が増加している。 Slime and Noro cause a problem of running out of paper and causing operational troubles. In addition, suranium and noro have a problem that they transfer to paper and cause spotted product defects (development of paper). In particular, in recent years, recycling of white water has been promoted from the standpoint of resource saving, so the paper-making defects due to slime and noro are increasing.

白水系のスライムを防止する方法としては次亜塩素酸ナトリウムと抗菌剤を添加する方法(特許文献1)、次亜塩素酸及び/又は次亜臭素酸を生じる化合物を含むスライムコントロール(特許文献2)また、漂白工程、抄紙工程、抄紙後の製紙排水に次亜塩素酸又は亜塩素酸を添加してスライムコントロールだけでなく、ピッチコントロール及びアニオントラッシュのコントーロールをしているものが開示されている(特許文献3)
しかし、白水に添加できる次亜塩素酸や次亜塩素酸ナトリウムには限界がある。多量に添加すると臭気が紙について問題となる恐れ、装置の腐食問題、更には塩素化合物の発生による作業環境の悪化等の問題もあり、未脱墨の古紙パルプを原料に用いる板紙の製造においては十分とはいえず、成紙欠点はなくなっていないのが現状である。
As a method for preventing white water-based slime, sodium hypochlorite and an antibacterial agent are added (Patent Document 1), and slime control containing a compound that generates hypochlorous acid and / or hypobromite (Patent Document 2) ) In addition, not only slime control but also pitch control and anion trash control by adding hypochlorous acid or chlorous acid to bleaching process, papermaking process, papermaking wastewater after papermaking is disclosed. (Patent Document 3)
However, there is a limit to hypochlorous acid and sodium hypochlorite that can be added to white water. When added in a large amount, there is a risk that odor may become a problem for paper, there are problems such as equipment corrosion problems, and deterioration of the working environment due to the generation of chlorine compounds, etc.In the manufacture of paperboard using undeinked waste paper pulp as a raw material It is not sufficient, and the current situation is that the paper-making defects are not gone.

特開平7−189182号公報JP-A-7-189182 特開2000−256993号公報JP 2000-259933 A WO2006/137183号公報WO 2006/137183

原料に未脱墨の古紙パルプを用い、板紙の製造工程中の白水循環系のスライムコントロールだけでは防止しきれないスライムやノロといわれる異物による成紙欠点を防止して板紙を製造することを目的とする。 The purpose is to produce paperboard by using undeinked waste paper pulp as a raw material, and preventing paper-making defects caused by foreign matter called slime and noro that cannot be prevented only by slime control of the white water circulation system during the paperboard manufacturing process. And

本発明者らは、白水循環系以外のスライムやノロの防止について種々検討を重ねた結果、抄紙工程中のワイヤーパート、ブレスパートでのシャワー水として次亜塩素酸又は次亜塩素酸塩を含有する水溶液を用いることにより、成紙欠点を減らすことができることを見出し、本発明を完成するに至った。 As a result of repeated studies on the prevention of slime and noro other than the white water circulation system, the present inventors contain hypochlorous acid or hypochlorite as shower water in the wire part and breath part during the paper making process. As a result, it has been found that the use of an aqueous solution to reduce the defects in the paper can lead to the completion of the present invention.

(1)未脱墨の古紙を製紙原料として板紙を製造する方法において、
次亜塩素酸又は次亜塩素酸塩を含有する水溶液をpH5〜7に調整し、ワイヤーパート及び/又はプレスパートにおいて、シャワー水として、霧状またはシャワー状に噴霧する板紙の製造方法。
(2)前記シャワー水は次亜塩素酸又は次亜塩素酸塩を有効塩素濃度で0.5ppm〜2ppmの範囲に調整されて噴霧される(1)記載の板紙の製造方法。
(3)前記ワイヤーパートにおいてのシャワー水は、ブレストシャワー水、各ワイヤー洗浄シャワー水、各シリンダーシャワー水、各ドクターシャワー水等として噴霧する(1)又は(2)に記載の板紙の製造方法。
(4)前記プレスパートにおいてのシャワー水は、フェルト洗浄シャワー水、フェルトウェツティングシャワー水として噴霧する(1)〜(3)のいずれかに記載の板紙の製造方法。
(1) In a method for producing paperboard using undeinked waste paper as a papermaking raw material,
The manufacturing method of the paperboard which adjusts the aqueous solution containing hypochlorous acid or hypochlorite to pH 5-7, and sprays it in the shape of a mist or a shower as shower water in a wire part and / or a press part.
(2) The method for producing paperboard according to (1), wherein the shower water is sprayed with hypochlorous acid or hypochlorite adjusted to an effective chlorine concentration in a range of 0.5 ppm to 2 ppm.
(3) The shower water in the said wire part is a manufacturing method of the paperboard as described in (1) or (2) sprayed as breast shower water, each wire washing shower water, each cylinder shower water, each doctor shower water, etc.
(4) The paperboard manufacturing method according to any one of (1) to (3), wherein the shower water in the press part is sprayed as felt washed shower water or felt wetting shower water.

本発明によれば、抄造時にワイヤーパート及び又プレスパートで次亜塩素酸又は次亜塩酸塩をシャワー水として噴霧させることにより、白水循環系へのスライムコントロールでは防ぎきれなかった、成紙欠点を減少させることが可能になり、製品の品質安定化及び、洗浄のための休転の頻度を低減することが可能となった。 According to the present invention, by spraying hypochlorous acid or hypochlorite as shower water in the wire part and / or the press part at the time of papermaking, it is possible to eliminate the disadvantages of the paper that could not be prevented by slime control to the white water circulation system. It has become possible to reduce the frequency of stabilization of products and the frequency of suspension for washing.

抄紙機の一例An example of a paper machine ワイヤーパート(ハイズピードウルトラの例Wire part (Example of high speed speed ultra) ワイヤーパート(フォードリニア)の例Wire part (Ford Linear) example プレスパートの例Example of a press part

本発明は、未脱墨の古紙パルプを原料パルプに用いる板紙の製造方法である。
原料となる未脱墨の古紙パルプはパルパーで離解され、クリーナー・スクリーン等で異物を除去し、叩解により古紙パルプのフリーネスを調整し、紙力剤等の必要な薬品が添加され、各古紙パルプを所定の比率で混合して、抄紙工程に送られる。未脱墨の古紙パルプの原料としては、新聞古紙、印刷古紙、ダンボール古紙、包装用古紙、オフィス古紙等の古紙を原料とするパルプが挙げられる。これらの古紙パルプは単独、または2種類以上混合して使用してもよい。
The present invention is a method for producing paperboard using undeinked waste paper pulp as raw material pulp.
Undeinked waste paper pulp that is the raw material is disaggregated by a pulper, foreign matter is removed with a cleaner screen, etc., the freeness of waste paper pulp is adjusted by beating, and necessary chemicals such as paper strength agents are added to each waste paper pulp Are mixed at a predetermined ratio and sent to the papermaking process. Examples of raw materials for undeinked waste paper pulp include pulp made from waste paper such as newspaper waste paper, printing waste paper, cardboard waste paper, packaging waste paper, and office waste paper. These waste paper pulps may be used alone or in combination of two or more.

離解・精選工程を経た古紙パルプを公知の各種リファイナー、PFIミル等の叩解機、あるいはデイスパーザー、マイカプロセッサ、ニーダー等の混練装置を用いて、叩解又は混練する。叩解又は混練時に下降させるカナダ標準濾水度(以下CSFと略称)は50ml以上が好ましい。50ml未満では、叩解又は混練処理による、内添填料や塗工層顔料等の灰分の細片化が不十分である。また、該古紙パルプのCSFが80ml以下になるまで叩解を進めると、次の分級工程における操業性が悪化するため好ましくない。叩解後の古紙パルプには各種添加剤(例えば填料、サイズ剤、濾水向上剤等)を添加して紙料として調成し、抄紙工程に送られる。 Waste paper pulp that has undergone the disaggregation / selection process is beaten or kneaded using a known various refiner, a beating machine such as a PFI mill, or a kneading apparatus such as a disperser, mica processor, or kneader. The Canadian standard freeness (hereinafter abbreviated as CSF) lowered during beating or kneading is preferably 50 ml or more. If it is less than 50 ml, ash content such as internally added filler and coating layer pigment is not sufficiently fragmented by beating or kneading treatment. Further, it is not preferable to beat the waste paper pulp until the CSF becomes 80 ml or less because the operability in the next classification step deteriorates. Various additives (for example, a filler, a sizing agent, a drainage improver, etc.) are added to the used paper pulp after beating to prepare it as a paper material, which is sent to the papermaking process.

本発明では、抄紙工程において、次亜塩素酸及び/又は次亜塩素酸塩を含有する水溶液をpH5〜7に調整して、ワイヤーパート及び/又はプレスパートでのシャワー水として噴霧する。
次亜塩素酸塩としては次亜塩素酸ナトリウム、次亜塩素酸カルシウム、次亜塩素酸カリウム、次亜塩素酸リチウムなどが上げられる。次亜塩素酸塩に比べ次亜塩素酸のほうが殺菌効果が高いため、さらに抄紙時に他の添加薬品への影響が少ないことからも好ましい。
次亜塩素酸及び/又は次亜塩素酸塩はシャワー水として使用するときに水溶液のpHを5〜7の範囲に希硫酸を用いて調整して使用される。pHが5未満になると塩素ガスが発生する危険があり、pHが7を超えると殺菌効果の高い次亜塩素酸の存在が低くなるため好ましくない。
In the present invention, in the paper making process, an aqueous solution containing hypochlorous acid and / or hypochlorite is adjusted to pH 5 to 7 and sprayed as shower water in the wire part and / or press part.
Examples of hypochlorite include sodium hypochlorite, calcium hypochlorite, potassium hypochlorite, and lithium hypochlorite. Hypochlorous acid has a higher bactericidal effect than hypochlorite, and is also preferable because it has less influence on other additive chemicals during papermaking.
Hypochlorous acid and / or hypochlorite is used by adjusting the pH of the aqueous solution in the range of 5 to 7 with dilute sulfuric acid when used as shower water. If the pH is less than 5, there is a danger that chlorine gas is generated, and if the pH exceeds 7, the presence of hypochlorous acid having a high bactericidal effect is lowered, which is not preferable.

また次亜塩素酸及び/又は次亜塩素酸塩をシャワー水として使用するときに、好ましくは有効塩素濃度を0.5ppm〜2ppmに調整して使用される。
有効塩素濃度が0.5ppm未満では殺菌効果が不足し十分にスライムはノロの発生を防ぐことができないことがある。また2ppmを超えると、フェルトの繊維切れが発生しやすくなり、繊維切れを起こしたフェルトを使用して得られる板紙は地合いムラが悪化する問題がある。
When using hypochlorous acid and / or hypochlorite as shower water, the effective chlorine concentration is preferably adjusted to 0.5 ppm to 2 ppm.
If the effective chlorine concentration is less than 0.5 ppm, the bactericidal effect is insufficient and the slime may not be able to sufficiently prevent the generation of noro. On the other hand, when the content exceeds 2 ppm, the fiber breakage of the felt is likely to occur, and the paper board obtained using the felt having the fiber breakage has a problem that the unevenness of the texture deteriorates.

図1に板紙の抄紙機の一例を示す。
図1には5層抄き板紙抄紙機の一例を示す。図の左側から1層目が形成され、順に右側に進み、2層目から5層目までの原料が重ねられ繊維をからませ、同時に脱水される。紙の性質や厚みにより、層数は様々であり、抄紙機によってその層数が異なる。
その後、プレスパートに送られ、フェルトに挟み、ロールとロールの間を通し、そのロールで強く押し付けて脱水する。
FIG. 1 shows an example of a paperboard machine.
FIG. 1 shows an example of a five-layer paperboard machine. The first layer is formed from the left side of the figure, proceeding to the right side in order, the raw materials from the second layer to the fifth layer are stacked, entangled with fibers, and simultaneously dehydrated. The number of layers varies depending on the nature and thickness of the paper, and the number of layers varies depending on the paper machine.
Then, it is sent to the press part, sandwiched between felts, passed between the rolls, and pressed strongly with the rolls to dehydrate.

図2はハイスピードウルトラ、図3にはフォードリニアと、一般的なワイヤーパートの例を示す。ワイヤーパートでロールが高速で回転しながら原料を脱水しているため、脱水された白水が周辺に飛び散る。よって、ワイヤー、ロール及び周辺設備が汚れ、スライムやノロが発生する。これらのスライムやノロが大きくなると紙に転移し、最終製品での汚れ発生の原因のひとつとなっている。
また、直接原料と接しているワイヤーは徐々に原料詰まり等による汚れが生じる。
これらの対策としてシャワー設備を配備している(図2、3に一般的なシャワー配置を示す)。しかし、シャワー水自体も腐敗してスライムやノロを発生させてしまう。よって、シャワー配管内や、シャワー水が飛び散った周辺設備に発生したスライムやノロが紙に転移して最終製品に汚れを発生させてしまう事がある。
板紙には単層抄紙と多層抄紙があるが、特に多層抄紙では層ごとにワイヤーパートが存在するため、剥離したスライムが転写する箇所が多く、洗浄箇所も多くなる。ワイヤーパートに使用するシャワー水に次亜塩素酸及び/又は次亜塩素酸塩を含有する水溶液をpH5〜7に調整して抄紙時に常時噴霧して使用することにより、紙に転写することがない。ワイヤーパートで使用するシャワー水としてはブレストシャワー水、各ワイヤー洗浄シャワー水、各シリンダーシャワー水、各ドクターシャワー水が挙げられる。シャワー方式に制限はないが、シャワー水は速やかに吸引されて、紙に転写されないことが重要である。
FIG. 2 shows an example of a high speed ultra, FIG. 3 shows an example of a Ford linear and a general wire part. Since the raw material is dehydrated while the roll rotates at high speed in the wire part, the dehydrated white water scatters around. Therefore, a wire, a roll, and peripheral equipment become dirty, and slime and noro are generated. When these slimes and noro grows, they are transferred to paper, which is one of the causes of stains in the final product.
Further, the wire in direct contact with the raw material gradually becomes dirty due to the clogging of the raw material.
As a countermeasure against these problems, shower facilities are provided (a general shower arrangement is shown in FIGS. 2 and 3). However, the shower water itself rots and generates slime and noro. Therefore, slime or noro generated in the shower piping or in the peripheral equipment where shower water is scattered may transfer to the paper and cause stains on the final product.
There are two types of paperboard: single-layer papermaking and multi-layer papermaking. In particular, in multi-layer papermaking, there is a wire part for each layer, so there are many places where the peeled slime is transferred, and there are many washing places. The shower water used for the wire part is adjusted to pH 5-7 with an aqueous solution containing hypochlorous acid and / or hypochlorite, and is always sprayed at the time of paper making so that it is not transferred to paper. . The shower water used in the wire part includes breast shower water, each wire wash shower water, each cylinder shower water, and each doctor shower water. Although there is no restriction on the shower method, it is important that the shower water is sucked quickly and not transferred to paper.

また、抄紙工程のプレス工程でも前記次亜塩素酸及び/又は次亜塩素酸塩を含有する水溶液をシャワー水として使用する。図4は一般的なプレスパートの一例である。
プレスパートにおいても、ワイヤーパート同様に高速でロールが回転しながら脱水をしている。このプレスパートでも脱水された白水の飛び散りやフェルトの汚れがあるためシャワー設備を配備している(図3に一般的なシャワー配置を示す)。ワイヤーパート同様にシャワー水自体の腐敗によりシャワー配管及びその周辺設備に汚れを発生させてしまう。
フレスパートでのシャワー水としてはフェルト洗浄シャワー水、フェルトウェツティングシャワー水等が挙げられる。プレスパート同様シャワー方式に制限はないが、シャワー水は速やかに吸引されて、紙に転写させないことが重要である。
更にワイヤーパート及び、プレスパートの両方で使用することにより、更に欠点が減少し、装置全体の洗浄回数が減るため好ましい。
Moreover, the aqueous solution containing the said hypochlorous acid and / or hypochlorite is also used as shower water also in the press process of a papermaking process. FIG. 4 shows an example of a general press part.
Also in the press part, as with the wire part, the roll rotates at high speed and dewaters. This press part is also equipped with shower facilities due to splashes of dehydrated white water and felt stains (a typical shower arrangement is shown in FIG. 3). Like the wire part, the shower water itself is rotted and the shower piping and surrounding facilities are contaminated.
Examples of shower water at the frespart include felt-washed shower water and felt-wetting shower water. Although there is no restriction on the shower system as in the press part, it is important that the shower water is quickly sucked and not transferred to paper.
Furthermore, it is preferable to use it in both the wire part and the press part since the disadvantages are further reduced and the number of times of cleaning of the entire apparatus is reduced.

以下に実施例により本発明を具体的に説明するが本発明はこれに限定されるものではない。
<実施例1>
原料に未脱墨の古紙パルプを用いて、pH6.0、濃度0.5ppmの次亜塩素酸水溶液をシャワー水として使用して5層抄き、170g/mの板紙を製造した。成紙欠点4個数/10Kmであり実用上問題ない品質が得られた。
EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited thereto.
<Example 1>
Using undeinked waste paper pulp as a raw material, a hypochlorous acid aqueous solution having a pH of 6.0 and a concentration of 0.5 ppm was used as shower water, and five layers were made to produce a 170 g / m 2 paperboard. The number of defective paper sheets was 4 pieces / 10 Km, and a practically satisfactory quality was obtained.

<実施例2>
次亜塩素酸水溶液のpH5.0、濃度を1ppmにした以外は実施例1と同様にして170g/mの板紙を製造した。
成紙欠点2個数/10Kmであり実用上問題ない品質が得られた。
<Example 2>
A paperboard of 170 g / m 2 was produced in the same manner as in Example 1, except that the pH of the hypochlorous acid aqueous solution was 5.0 and the concentration was 1 ppm.
The number of defective paper sheets was 2/10 Km, and a practically satisfactory quality was obtained.

<実施例3>
次亜塩素酸水溶液のpHを7.0、濃度を3.0ppmにした以外は実施例1と同様にして170g/mの板紙を製造した。
成紙欠点1個数/10Kmであり実用上問題ない品質が得られた。
<Example 3>
A 170 g / m 2 paperboard was produced in the same manner as in Example 1 except that the pH of the hypochlorous acid aqueous solution was 7.0 and the concentration was 3.0 ppm.
The number of paper defects was 1/10 Km, and a practically satisfactory quality was obtained.

<比較例1>
次亜塩素酸水溶液のpHを7.5、濃度0.5ppmにした以外は実施例1と同様にして170g/mの板紙を製造した。成紙欠点10個数/10Kmであり、欠陥が多く外観が劣り実用に適さない品質であった。
<Comparative Example 1>
A paperboard of 170 g / m 2 was produced in the same manner as in Example 1 except that the pH of the hypochlorous acid aqueous solution was 7.5 and the concentration was 0.5 ppm. The number of paper defects was 10/10 km, and the quality was unsuitable for practical use due to many defects and poor appearance.

<比較例2>
次亜塩素酸水溶液を、水道水にした以外は実施例1と同様にして170g/mの板紙を製造した。成紙欠点15個数/10Kmであり、欠陥が多く外観が劣り実用に適さない品質であった。
<Comparative example 2>
A paperboard of 170 g / m 2 was produced in the same manner as in Example 1 except that tap water was used as the hypochlorous acid aqueous solution. The number of defective paper sheets was 15 / 10Km, and there were many defects and the appearance was poor and the quality was not suitable for practical use.

実施例に示すように、抄紙工程中のワイヤーパート、ブレスパートでシャワー水として次亜塩素酸又は次亜塩素酸塩を含有する水溶液を用いることにより、成紙欠点を減らすことができる。 As shown in the Examples, by using an aqueous solution containing hypochlorous acid or hypochlorite as shower water in the wire part and the breath part during the paper making process, it is possible to reduce papermaking defects.

本発明は、未脱墨の古紙パルプを用いる板紙の製造において、スライムやノロといわれる異物の発生を抑制し、成紙欠点を防止した板紙を提供できる。 INDUSTRIAL APPLICABILITY The present invention can provide a paperboard that suppresses the occurrence of foreign matters called slime and noro in the production of paperboard using undeinked waste paper pulp, and prevents the defects of papermaking.

1:シリンダー洗浄シャワー
2:ドクターシャワー
3:ワイヤー洗浄シャワー
4:ブレストシャワー
5:ワイヤー
6:ウェッティングシャワー
7:フェルト洗浄シャワー
8:フェルト
1: Cylinder cleaning shower
2: Doctor shower
3: Wire wash shower
4: Breast shower
5: Wire
6: Wetting shower
7: felt wash shower
8: Felt

Claims (4)

未脱墨の古紙を製紙原料として板紙を製造する方法において、
次亜塩素酸又は次亜塩素酸塩を含有する水溶液をpH5〜7に調整し、ワイヤーパート及び/又はプレスパートにおいて、シャワー水として、霧状またはシャワー状に噴霧する板紙の製造方法。
In a method for producing paperboard using undeinked waste paper as a raw material for papermaking,
The manufacturing method of the paperboard which adjusts the aqueous solution containing hypochlorous acid or hypochlorite to pH 5-7, and sprays it in the shape of a mist or a shower as shower water in a wire part and / or a press part.
前記シャワー水は次亜塩素酸又は次亜塩素酸塩を有効塩素濃度で0.5ppm〜2ppmの範囲に調整されて噴霧される請求項1記載の板紙の製造方法。 The said shower water is a manufacturing method of the paperboard of Claim 1 which adjusts the hypochlorous acid or hypochlorite to the range of 0.5 ppm-2 ppm by effective chlorine concentration, and is sprayed. 前記ワイヤーパートにおいてのシャワー水は、ブレストシャワー水、各ワイヤー洗浄シャワー水、各シリンダーシャワー水、各ドクターシャワー水等として噴霧する請求項1又は2に記載の板紙の製造方法。 The shower water in the said wire part is a manufacturing method of the paperboard of Claim 1 or 2 sprayed as breast shower water, each wire washing shower water, each cylinder shower water, each doctor shower water, etc. 前記プレスパートにおいてのシャワー水は、フェルト洗浄シャワー水、フェルトウェッティングシャワー水として噴霧する請求項1〜3のいずれかに記載の板紙の製造方法。 The shower paper in the said press part is the manufacturing method of the paperboard in any one of Claims 1-3 sprayed as felt washing shower water and felt wetting shower water.
JP2011166268A 2011-07-29 2011-07-29 Method for producing cardboard Withdrawn JP2013028879A (en)

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