JP2000328477A - Production of used paper pulp for paperboard - Google Patents
Production of used paper pulp for paperboardInfo
- Publication number
- JP2000328477A JP2000328477A JP13365099A JP13365099A JP2000328477A JP 2000328477 A JP2000328477 A JP 2000328477A JP 13365099 A JP13365099 A JP 13365099A JP 13365099 A JP13365099 A JP 13365099A JP 2000328477 A JP2000328477 A JP 2000328477A
- Authority
- JP
- Japan
- Prior art keywords
- pulp
- treatment
- waste paper
- paper pulp
- enzyme
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/64—Paper recycling
Landscapes
- Paper (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は古紙パルプの処理方
法に関するもので、更に詳しくは顔料塗工紙を含む古紙
を原料とする板紙用古紙パルプの強度を向上させ、板紙
の剛度を向上させるための処理方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating waste paper pulp, and more particularly, to improving the strength of waste paper pulp for paper board made from waste paper containing pigment-coated paper and improving the rigidity of the paper board. Regarding the processing method.
【０００２】[0002]
【従来の技術】紙の強度（以下紙力と称する）としては
裂断長、破裂、引き裂き、耐折、層間強度、剛度などが
あるが、多くの場合これらの値は高いものが望まれる。
木材資源の保護や紙のリサイクルの観点から、古紙をパ
ルプ原料として用いることが多くなり、その使用比率も
増加する傾向にある。一般的に古紙パルプはバージンパ
ルプより強度が劣り、リサイクルの回数がますに従い劣
化して強度が低下していくことが知られている。また、
近年、原料古紙中のコート紙比率が高まり、古紙パルプ
中の灰分含有量が増大していることも強度低下の原因と
なっている。2. Description of the Related Art Paper strength (hereinafter referred to as "paper strength") includes tear length, rupture, tearing, folding resistance, interlayer strength, stiffness, and the like. In many cases, higher values are desired.
From the viewpoint of protection of wood resources and recycling of paper, waste paper is often used as a raw material for pulp, and its usage ratio tends to increase. It is generally known that waste paper pulp has lower strength than virgin pulp, and deteriorates and strength decreases as the number of times of recycling increases. Also,
In recent years, the ratio of coated paper in the raw material waste paper has increased, and the ash content in the waste paper pulp has also increased, which also causes a decrease in strength.
【０００３】一般に紙力を向上させる方法としては、原
料パルプの叩解、紙力増強剤の使用、が挙げられる。原
料パルプの叩解を進めると紙力は向上するものの、濾水
性が悪くなり、抄紙速度が低下するので生産性が悪化す
る。特に、古紙パルプは微細繊維を多く含むため濾水性
が低く、叩解処理による強度向上には抄紙マシン操業の
面から限界がある。そこで、濾水性を悪化させずに紙力
を向上させるために、通常紙力増強剤を使用する。しか
しながら、紙力増強剤は高価であり、また抄紙系内の汚
れの原因ともなるため、その使用量は少ないほうが望ま
しい。また、近年、古紙パルプはコート紙由来のアニオ
ン性夾雑物を多く含むようになったため、紙力増強剤に
よる効果発現が低下している。In general, methods for improving paper strength include beating raw pulp and using a paper strength enhancer. As the beating of the raw pulp proceeds, the paper strength is improved, but the drainage becomes poor and the papermaking speed is reduced, so that the productivity is deteriorated. In particular, waste paper pulp contains a large amount of fine fibers and thus has low drainage, and there is a limit in improving the strength by beating treatment from the viewpoint of operation of a papermaking machine. Therefore, in order to improve paper strength without deteriorating drainage, a paper strength enhancer is usually used. However, since the paper-strengthening agent is expensive and causes stains in the papermaking system, it is desirable that the amount used is small. Also, in recent years, wastepaper pulp has been rich in anionic contaminants derived from coated paper, and the effect of the paper strength enhancer has been reduced.
【０００４】最近、古紙パルプに酵素処理を施し、強度
向上を図る方法が提案されている。例えば特開平０６−
１２８８９１号公報には、古紙パルプの叩解処理の前、
または後に、キシラナーゼ活性／ＣＭ−セルラーゼ活性
の比が０．０５〜１０の範囲にある酵素で処理すること
が開示されている。この発明は、酵素処理により古紙パ
ルプのカナダ標準濾水度（ＣＳＦ）を上昇させ叩解しろ
を大きくするとともに、パルプ自体の表面を改質するこ
とにより、強度向上を図るものである。Recently, a method has been proposed in which waste paper pulp is subjected to an enzyme treatment to improve the strength. For example, JP-A-06-
No. 1288891 discloses that before the beating treatment of waste paper pulp,
Or later it is disclosed to treat with an enzyme having a ratio of xylanase activity / CM-cellulase activity in the range of 0.05-10. The present invention is intended to increase the Canadian Standard Freeness (CSF) of waste paper pulp by enzymatic treatment to increase the beating margin, and to improve the strength by modifying the surface of the pulp itself.
【０００５】しかし、特開平０６−１２８８９１号公報
では、ラボで調製した雑誌古紙パルプを用いているのに
対し、工場からサンプリングした雑誌古紙パルプを用い
た場合は、原質工程での白水循環、およびマシン白水の
混入等によりコート紙由来のアニオン性夾雑物、灰分、
および微細繊維が増加しているため、酵素処理効果の発
現が妨げられ、酵素素処理によるＣＳＦ向上、叩解後の
強度向上は期待できない。[0005] However, in Japanese Patent Application Laid-Open No. 06-1288891, magazine wastepaper pulp prepared in a laboratory is used, whereas when magazine wastepaper pulp sampled from a factory is used, white water circulation in the raw material process, And anionic contaminants derived from coated paper, ash,
Further, the increase in the number of fine fibers hinders the manifestation of the effect of the enzyme treatment, and it is not possible to expect an improvement in CSF or an improvement in strength after beating by enzymatic treatment.
【０００６】[0006]
【発明が解決しようとする課題】古紙パルプの強度改善
のため酵素処理を施すに当たり、酵素処理効果を確実に
発現させ、板紙の剛度を向上させることを課題とする。SUMMARY OF THE INVENTION An object of the present invention is to provide an enzyme treatment for improving the strength of waste paper pulp in order to ensure the effect of the enzyme treatment and to improve the rigidity of the paperboard.
【０００７】[0007]
【課題を解決するための手段】上記課題を解決するた
め、本発明は以下の発明を包含する。In order to solve the above problems, the present invention includes the following inventions.
【０００８】（１）古紙パルプから分級処理により、短
繊維フラクションを除去して、蚊級処理前の古紙パルプ
とのカナダ標準ロ水度の差が５０〜２５０ｍｌである長
繊維フラクションを得た後、該長繊維フラクションにＣ
Ｍ−セルラーゼ活性／キシラナーゼ活性の比が２０以下
である酵素で処理を施した後に叩解処理を行うことを特
徴とする板紙用古紙パルプの処理方法。(1) After removing the short fiber fraction from the waste paper pulp by classification treatment to obtain a long fiber fraction having a Canadian standard water content difference of 50 to 250 ml from the waste paper pulp before the mosquito treatment. , C in the long fiber fraction
A method for treating waste paper pulp for paperboard, comprising treating with an enzyme having a ratio of M-cellulase activity / xylanase activity of 20 or less and then beating.
【０００９】本発明の処理方法は、古紙パルプ製造プロ
セスにおいて、まず、古紙パルプを大量の水で希釈して
公知の方法、例えば、ＳＰフィルター、ＤＮＴウォッシ
ャーで分級する。分級の条件は特に制限されないが、処
理による短繊維フラクションの除去効率を考慮すればパ
ルプ濃度１．５％以下まで希釈した後に分級処理に供す
ることが望ましい。In the treatment method of the present invention, waste paper pulp is first diluted with a large amount of water and classified by a known method, for example, an SP filter and a DNT washer in a waste paper pulp production process. The classification conditions are not particularly limited, but in consideration of the removal efficiency of the short fiber fraction by the treatment, it is desirable to dilute the pulp to a concentration of 1.5% or less before subjecting it to the classification treatment.
【００１０】分級処理により、古紙パルプは長繊維に富
む長繊維フラクションと、微細繊維、灰分（内添填料、
コート紙塗工層由来の顔料）に富む短繊維フラクション
に分級される。酵素処理による紙力向上効果発現のため
には、長繊維フラクションのカナダ標準濾水度を処理前
の古紙パルプより５０〜２５０ｍｌ、好ましくは８０〜
２００ｍｌ上昇させることが必要である。ＣＳＦの上昇
が５０ｍｌ未満では、酵素処理効果を妨害する成分の除
去が不十分であり、紙力向上効果発現が不十分となる。
また、ＣＳＦの上昇が２５０ｍｌより大きくなると、い
わゆるパルプ歩留りの低下が大きくなり、経済的ではな
い。[0010] By the classification treatment, the waste paper pulp has a long fiber fraction rich in long fibers, fine fibers and ash (internal filler,
(A pigment derived from the coated layer of coated paper). In order to express the paper strength improving effect by the enzyme treatment, the Canadian standard freeness of the long fiber fraction is 50 to 250 ml, preferably 80 to 250 ml, from the waste paper pulp before the treatment.
It is necessary to raise 200 ml. If the rise in CSF is less than 50 ml, the components that interfere with the enzyme treatment effect will not be sufficiently removed, and the paper strength improving effect will be insufficient.
On the other hand, if the rise in CSF is larger than 250 ml, the so-called pulp yield is greatly reduced, which is not economical.
【００１１】分級処理を施された長繊維フラクションを
酵素処理する場合、用いられる酵素はＣＭ−セルラーゼ
活性／キシラナーゼ活性の比が２０以下であることが適
当である。この比が２０より大きいと、酵素処理による
カナダ濾水度向上効果が小さいため、叩解しろの増大に
よる叩解後のシート強度向上効果が小さくなる。When the long fiber fraction that has been subjected to the classification treatment is treated with an enzyme, it is appropriate that the enzyme used has a ratio of CM-cellulase activity / xylanase activity of 20 or less. If this ratio is greater than 20, the effect of improving the freeness of Canada by the enzyme treatment is small, and the effect of improving the sheet strength after beating due to an increase in beating margin is small.
【００１２】本発明で言うセルラーゼとは、セルロース
のβ−１，４−グルコシド結合をエンド型に加水分解す
る酵素である。The cellulase referred to in the present invention is an enzyme that hydrolyzes a β-1,4-glucosidic bond of cellulose into an endo-type.
【００１３】また、本発明で言うキシラナーゼとは、キ
シランのβ−１，４−キシロシド結合を加水分解するも
のである。The xylanase referred to in the present invention hydrolyzes the β-1,4-xylosid bond of xylan.
【００１４】ＣＭ−セルラーゼ活性／キシラナーゼ活性
の比が２０以下である酵素が、なぜカナダ標準濾水度を
高くするのかは必ずしも明確ではないが、酵素による
パルプ表面の外部フィブリルの除去効果、酵素による
パルプの凝集効果、の２つが考えられる。ＣＭ−セルラ
ーゼのみではパルプ表面に沈着したキシランによりＣＭ
−セルラーゼの反応が阻害されるが、キシラナーゼが共
存すると、キシラナーセがキシランを分解し、ＣＭ−セ
ルラーゼのセルロースへのアクセスビリティーが向上す
る。したがって、ＣＭ−セルラーゼとキシラナーゼの共
存によりの効果の発現が大きくなると考えられる。Ｃ
Ｍ−セルラーゼ活性がキシラナーゼ活性に比べてきわめ
て小さい酵素では、キシランの分解により生じた新たな
パルプ表面がの効果発現に寄与していると考えられ
る。[0014] It is not always clear why an enzyme having a ratio of CM-cellulase activity / xylanase activity of 20 or less increases the Canadian standard freeness. Pulp flocculation effect. In the case of CM-cellulase alone, CM was obtained by xylan deposited on the pulp surface.
-The reaction of cellulase is inhibited, but in the presence of xylanase, xylanase decomposes xylan, improving the accessibility of CM-cellulase to cellulose. Therefore, it is considered that the expression of the effect due to the coexistence of CM-cellulase and xylanase increases. C
In the case of an enzyme whose M-cellulase activity is extremely small as compared with the xylanase activity, it is considered that the new pulp surface generated by the decomposition of xylan contributes to the manifestation of the effect.
【００１５】パルプスラリー固形分に対する酵素液添加
率は、０．０３〜３重量％、好ましくは０．１〜１重量
％である。酵素は同一の生物が産生した酵素でもよい
が、異種の生物が産生した酵素を混合して用いてもよ
い。酵素処理に際してのパルプスラリー濃度は１〜１５
重量％、好ましくは３〜１０重量％とし、スラリーｐＨ
は４〜８、好ましくは５〜７に調整する。酵素処理の温
度は２０〜６０℃、好ましくは４０〜５０℃である。酵
素処理の時間は酵素とパルプの接触時間を十分にとるた
め、少なくとも１時間は必要である。The enzyme solution is added to the pulp slurry at a solids content of 0.03 to 3% by weight, preferably 0.1 to 1% by weight. The enzyme may be an enzyme produced by the same organism, or a mixture of enzymes produced by different organisms. Pulp slurry concentration during enzyme treatment is 1 to 15
%, Preferably 3 to 10% by weight, and the slurry pH
Is adjusted to 4 to 8, preferably 5 to 7. The temperature of the enzyme treatment is 20 to 60 ° C, preferably 40 to 50 ° C. The time of the enzyme treatment is at least one hour in order to obtain a sufficient contact time between the enzyme and the pulp.
【００１６】本発明により処理された古紙パルプを使用
して製造される板紙は、米坪１００ｇ／ｍ2以上の多層
抄き板紙である。多層抄き板紙は少なくとも表層、中
層、裏層からなり、５〜９層が一般的である。多層抄き
板紙のようなサンドイッチ構造の剛度を向上させるため
には、中層を嵩高にして、表層、裏層のヤング率を高く
することが必要である。本発明では分級処理によって、
単繊維としてヤング率が高い、長繊維フラクションを得
ることが可能で、さらにその後の酵素処理活性阻害物質
が除去されているため、酵素処理の効果が高くなり叩解
処理とあいまってさらに処理後の古紙パルプのヤング率
が向上する。よって、高いヤング率を必要とする多層抄
板紙の最外層である表層およびまたは裏層に使用するこ
とが可能となる。The paperboard produced using the waste paper pulp treated according to the present invention is a multi-layered paperboard having a grain size of 100 g / m 2 or more. The multilayered paperboard comprises at least a surface layer, a middle layer, and a back layer, and generally has 5 to 9 layers. In order to improve the stiffness of a sandwich structure such as a multilayer paperboard, it is necessary to increase the bulk of the middle layer and the Young's modulus of the surface layer and the back layer. In the present invention, by the classification process,
It is possible to obtain a long fiber fraction with a high Young's modulus as a single fiber, and since the enzymatic treatment activity inhibitor is removed, the effect of the enzymatic treatment is enhanced, and the waste paper after further treatment is combined with the beating treatment. Pulp's Young's modulus is improved. Therefore, it can be used for the outermost layer and / or the outermost layer of the multilayer paperboard requiring a high Young's modulus.
【００１７】本発明により処理された古紙パルプを多層
抄き板紙に使用するに際しては、表層およびまたは裏層
に５０〜１００重量％含有することが好ましい。多層抄
き板紙においては、他の層、すなわち、表下層、中層な
どの古紙パルプ含有量について特に制限はない。When the waste paper pulp treated according to the present invention is used for a multilayer paperboard, it is preferably contained in the surface layer and / or the back layer in an amount of 50 to 100% by weight. In the multilayer paperboard, there is no particular limitation on the content of the wastepaper pulp in the other layers, ie, the lower and middle layers.
【００１８】多層抄き板紙の中層は、直接、目に触れる
部分ではないため、従来からパルプ粕、古紙粕、ＤＩＰ
工程から生じるフローテーターフロス等の低質原料を受
け入れている場合が多い。中層には、最外層程強度は必
要とされないので、古紙パルプを分級処理して生じる微
細繊維、灰分を含む短繊維フラクションを配合すること
が可能で、有効利用が図られる。Since the middle layer of the multi-layered paperboard is not a part which is directly visible, conventionally, pulp cake, waste paper cake, DIP
In many cases, low-quality raw materials such as flotator floss generated from the process are received. Since the middle layer is not required to be as strong as the outermost layer, a short fiber fraction containing fine fibers and ash generated by classifying waste paper pulp can be blended, and effective utilization can be achieved.
【００１９】本発明による処理で酵素処理効果の発現が
大きくなるのは、古紙パルプスラリー中に含まれる酵素
活性阻害物質が分級処理により除かれるためと見られ
る。叩解後の分級・酵素処理パルプの強度が叩解後の分
級処理パルプに比べて向上するのは、酵素処理によりパ
ルプのＣＳＦが上昇し、いわゆる叩解しろが大きくなる
ため、およびパルプ繊維表面が改質され、繊維間結合能
が大きくなるため、と考えられる。The reason why the treatment according to the present invention has a large effect of the enzyme treatment is considered to be that the enzyme activity inhibitor contained in the waste paper pulp slurry is removed by the classification treatment. The strength of the classified and enzyme-treated pulp after beating is improved as compared with the classified pulp after beating because the enzyme treatment increases the CSF of the pulp, so-called beating margin increases, and the pulp fiber surface is modified. It is considered that the inter-fiber binding ability increases.
【００２０】[0020]
【実施例】本発明を実施例によりさらに詳細に説明する
が、本発明は実施例にかぎられるものではない。EXAMPLES The present invention will be described in more detail with reference to examples, but the present invention is not limited to the examples.
【００２１】（分級処理）古紙パルプとして、製紙工場
から雑誌100%の古紙を離解したパルプＡを得た。これを
目標フリーネスに応じて希釈濃度を調整し、十分撹拌し
た後、150メッシュふるいでパルプ濃度10%に濃縮し、微
細繊維および灰分を洗浄除去し、長繊維フラクション
（Ｌ．Ｆ．と略）であるパルプＢ、Ｃ、Ｄを得た。表１
に各パルプのＣＳＦ、歩留り、およびＣＳＦ１３０ｍｌ
を目標にラボディスクリファイナーで叩解処理を施した
後の物性値を示す。なお、シートの米坪は６０g/m2であ
る。(Classification) Pulp A obtained by disintegrating 100% of used magazines from a paper mill was obtained as used paper pulp. After adjusting the dilution concentration in accordance with the target freeness and sufficiently stirring, the mixture was concentrated to a pulp concentration of 10% with a 150-mesh sieve, and fine fibers and ash were removed by washing. Pulp B, C, and D were obtained. Table 1
130 ml of CSF, yield and CSF of each pulp
The physical property values after beating treatment with a laboratory disc refiner with the goal of are shown below. In addition, the rice tsubo of the sheet is 60 g / m 2 .
【００２２】[0022]
【表１】 [Table 1]
【００２３】本実施例で使用する酵素のＣＭ−セルラー
ゼ、キシラナーゼ活性を表２に示すTable 2 shows the CM-cellulase and xylanase activities of the enzymes used in this example.
【００２４】[0024]
【表２】 [Table 2]
【００２５】＜試験方法＞各種測定値は以下により測定
した。 裂断長 ＪＩＳ Ｐ８１１３ ヤング率 ＪＩＳ Ｐ８１１３ 剛度 ＪＩＳ Ｐ８１２５ 灰分 ＪＩＳ Ｐ８１２８ ただし最高温度５００℃<Test Method> Various measured values were measured as follows. Break length JIS P8113 Young's modulus JIS P8113 Stiffness JIS P8125 Ash content JIS P8128 However, maximum temperature 500 ° C
【００２６】＜実施例１＞表１に示す叩解処理前のＬ．
Ｆ．Ｄからパルプ濃度５％のスラリーを調製し、硫酸を
添加しスラリーｐＨを６．５に調整した後、ＳＰ４７３
を０．２％添加し、温度４０℃で４時間反応させ、ＣＳ
Ｆ４６０ｍｌの古紙スラリーを得た。得られた古紙スラ
リーをパルプ濃度３％に調整し、ラボディスクリファイ
ナーでＣＳＦ１４０ｍｌまで叩解処理を施した。得られ
た古紙パルプを公知の手すきシートマシンでシート化
し、品質試験を行った結果を表３に示す。また、得られ
た古紙パルプを裏層原料として、表４に示すパルプ配合
で、表層、表下層、中層、裏層からなる抄き合わせシー
トを作成し、テーバー剛度を比較した結果も併せて表３
に示す<Example 1> L. before beating treatment shown in Table 1
F. A slurry having a pulp concentration of 5% was prepared from D, and sulfuric acid was added to adjust the slurry pH to 6.5.
Was added and reacted at a temperature of 40 ° C. for 4 hours.
F460 ml of waste paper slurry was obtained. The obtained used paper slurry was adjusted to a pulp concentration of 3%, and beaten to 140 ml of CSF with a laboratory disc refiner. The obtained waste paper pulp was formed into a sheet by a known hand sheet machine, and the results of a quality test are shown in Table 3. Using the obtained waste paper pulp as a backing layer raw material, a plywood composition shown in Table 4 was used to prepare a laminated sheet comprising a surface layer, a lower layer, a middle layer, and a back layer. 3
Shown in
【００２７】＜実施例２〜３．比較例１〜５＞実施例１
において、供試パルプ、使用酵素を表３に示す通りとし
た以外は、実施例と同じ手順で古紙パルプのシートを得
て、品質試験を行った結果を表３に示す。<Examples 2-3. Comparative Examples 1 to 5> Example 1
In Table 3, a sheet of waste paper pulp was obtained in the same procedure as in Example except that the test pulp and the enzyme used were as shown in Table 3, and the quality test was performed.
【００２８】分級処理を行わず、そのまま酵素処理を行
った比較例２では、酵素処理前後での上昇ＣＳＦが１０
ｍｌと小さい。叩解処理を施した後の裂断長において、
酵素処理による強度向上効果は認められない。分級処理
によりＣＳＦを４０ｍｌ上昇させたＬ．Ｆ．Ｂを酵素処
理した比較例１においても、酵素処理によるＣＳＦ上昇
は２０ｍｌと小さく、叩解処理後の強度向上効果は１．
７％と不十分である。In Comparative Example 2 in which the enzymatic treatment was performed without performing the classification treatment, the increase CSF before and after the enzymatic treatment was 10%.
ml and small. In the breaking length after performing the beating process,
No effect of improving the strength by the enzyme treatment is observed. L. in which CSF was raised by 40 ml by classification treatment. F. In Comparative Example 1 in which B was subjected to the enzyme treatment, the increase in CSF due to the enzyme treatment was as small as 20 ml, and the strength improvement effect after the beating treatment was 1.
7% is insufficient.
【００２９】これに対して、分級処理によるＣＳＦ上昇
が５０ｍｌ以上の長繊維フラクションを用いた実施例
１，２，３では、酵素処理によるＣＳＦ上昇が５０ｍｌ
以上となり、叩解処理後の明らかに強度向上効果が認め
られる。ただし、実施例１、２と同じ長繊維フラクショ
ンを用いても、ＣＭ−セルラーゼ活性／キシラナーゼ活
性の比が本発明の範囲外である酵素を用いた比較例３で
は、ＣＳＦ上昇が小さく、叩解後の強度向上効果も小さ
い。On the other hand, in Examples 1, 2, and 3 using a long fiber fraction having a CSF rise of 50 ml or more by the classification treatment, the CSF rise by the enzyme treatment was 50 ml.
As described above, a clear effect of improving the strength after the beating treatment is recognized. However, even when the same long fiber fraction as in Examples 1 and 2 was used, in Comparative Example 3 in which the ratio of CM-cellulase activity / xylanase activity was out of the range of the present invention, the CSF rise was small, and The effect of improving the strength is small.
【００３０】なお、分級処理によりＣＳＦ上昇幅が大き
くなるに従い、パルプ歩留まりが低下する。したがっ
て、酵素処理に先立つ古紙パルプの分級処理において
は、酵素処理効果とパルプ歩留まりの観点から、処理前
後のＣＳＦ上昇幅は５０〜２５０ｍｌ、好ましくは８０
〜２００ｍｌであることが明らかである。The pulp yield decreases as the CSF rise increases by the classification process. Therefore, in the classification process of waste paper pulp prior to the enzyme treatment, the CSF increase before and after the treatment is 50 to 250 ml, preferably 80, from the viewpoint of the enzyme treatment effect and the pulp yield.
It is clear that it is ~ 200 ml.
【００３１】[0031]
【表３】 [Table 3]
【００３２】[0032]
【表４】 [Table 4]
【００３３】次に、本発明による古紙パルプを裏層原料
として用いた抄きあわせシートの剛度向上効果を説明す
る。分級処理なしで酵素処理を施し、叩解処理を行った
古紙パルプを裏層に使用した比較例２では、分級処理、
酵素処理を施さずに叩解処理をした古紙パルプを使用し
た比較例５と、剛度はほぼ同じ値を示し、酵素処理の効
果は認められない。一方、分級処理を施し、酵素処理、
叩解処理を行った古紙パルプを裏層に使用した実施例
１，２では、分級処理、叩解処理を行った古紙パルプを
裏層に使用した比較例４より、剛度は４〜５％向上し、
酵素処理の効果が認められる。Next, the effect of improving the rigidity of a laminated sheet using waste paper pulp according to the present invention as a backing layer raw material will be described. In Comparative Example 2 in which the waste paper pulp subjected to the enzyme treatment without the classification treatment and subjected to the beating treatment was used for the back layer, the classification treatment,
The rigidity is almost the same as that of Comparative Example 5 using waste paper pulp that has been beaten without the enzyme treatment, and the effect of the enzyme treatment is not recognized. On the other hand, a classification treatment is performed, and an enzyme treatment,
In Examples 1 and 2 in which the waste paper pulp subjected to the beating treatment was used for the back layer, the rigidity was improved by 4 to 5% compared to Comparative Example 4 in which the waste paper pulp subjected to the classification treatment and the beating treatment was used for the back layer.
The effect of the enzyme treatment is observed.
【００３４】以上のように、古紙パルプに対して酵素処
理を施し、強度向上を図るためには、酵素処理に先立つ
古紙パルプの分級処理が不可欠である。As described above, classification of waste paper pulp prior to the enzyme treatment is indispensable in order to perform the enzyme treatment on the waste paper pulp to improve the strength.
【００３５】[0035]
【発明の効果】本発明によれば、原料パルプとして強度
がでにくい古紙パルプの紙力向上方法として酵素処理を
施す場合、古紙パルプに分級処理を施した後、酵素処理
を施すことにより、酵素処理による紙力向上効果を発現
させることができる。また、本発明による古紙パルプを
板紙の最外層に使用することにより板紙の剛度が向上す
る。According to the present invention, when enzymatic treatment is performed as a method of improving the strength of waste paper pulp as a raw pulp, the enzyme is treated by subjecting waste paper pulp to a classification treatment and then to an enzyme treatment. The paper strength improving effect by the treatment can be exhibited. In addition, the rigidity of the paperboard is improved by using the waste paper pulp according to the present invention as the outermost layer of the paperboard.
Claims (1)
ラクションを除去して、分級処理前の古紙パルプとのカ
ナダ標準ロ水度の差が５０〜２５０ｍｌである長繊維フ
ラクションを得た後、該長繊維フラクションにＣＭ−セ
ルラーゼ活性／キシラナーゼ活性の比が２０以下である
酵素で処理した後に叩解処理を行うことを特徴とする板
紙用古紙パルプの製造方法。(1) A short fiber fraction is removed from waste paper pulp by a classification treatment to obtain a long fiber fraction having a Canadian standard water content difference of 50 to 250 ml from the waste paper pulp before the classification treatment. A method for producing waste paper pulp for paperboard, comprising treating a long fiber fraction with an enzyme having a ratio of CM-cellulase activity / xylanase activity of 20 or less and then beating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13365099A JP2000328477A (en) | 1999-05-14 | 1999-05-14 | Production of used paper pulp for paperboard |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13365099A JP2000328477A (en) | 1999-05-14 | 1999-05-14 | Production of used paper pulp for paperboard |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000328477A true JP2000328477A (en) | 2000-11-28 |
Family
ID=15109760
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13365099A Pending JP2000328477A (en) | 1999-05-14 | 1999-05-14 | Production of used paper pulp for paperboard |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000328477A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010236152A (en) * | 2009-03-31 | 2010-10-21 | Daio Paper Corp | Newsprint paper |
-
1999
- 1999-05-14 JP JP13365099A patent/JP2000328477A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010236152A (en) * | 2009-03-31 | 2010-10-21 | Daio Paper Corp | Newsprint paper |
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