JP3098021B2 - How to make high brightness waste paper pulp - Google Patents
How to make high brightness waste paper pulpInfo
- Publication number
- JP3098021B2 JP3098021B2 JP14991290A JP14991290A JP3098021B2 JP 3098021 B2 JP3098021 B2 JP 3098021B2 JP 14991290 A JP14991290 A JP 14991290A JP 14991290 A JP14991290 A JP 14991290A JP 3098021 B2 JP3098021 B2 JP 3098021B2
- Authority
- JP
- Japan
- Prior art keywords
- bleaching
- pulp
- whiteness
- dip
- waste paper
- 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.)
- Expired - Fee Related
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)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は印刷古紙特に新聞古紙より得られた脱墨パル
プ（以下DIPと略称）を更に漂白することにより得られ
る高白色度古紙パルプの製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to the production of high-whiteness pulp obtained by further bleaching deinked pulp (hereinafter abbreviated as DIP) obtained from used printing paper, especially newsprint. About the method.
［従来の技術］ 従来より古紙は、木材より製造される木材パルプ（バ
ージンパルプと言われる）と並んで製紙原料の柱であ
り、段ボール古紙は主に段ボールに、新聞・雑誌類は主
に新聞紙や板紙の中、裏層のように、白色度がそれ程要
求されない分野に用いられていた。一般に新聞・雑誌を
始めとする印刷古紙を脱墨したDIPは白色度が低く、且
つ黄味を帯びているため、印刷紙やコピー紙に使用する
と下級紙のイメージを与えるので、どうしても使用分野
が制限されるのが実状であった。[Related Art] Conventionally, used paper is a pillar of papermaking raw materials along with wood pulp (called virgin pulp) manufactured from wood. Used corrugated cardboard is mainly used for cardboard, and newspapers and magazines are used mainly for newsprint. It is used in fields where whiteness is not so required, such as paper and paperboard, and back layers. In general, DIP obtained by deinking used printing paper, such as newspapers and magazines, has low whiteness and yellowish tint, so when used for printing paper or copy paper, it gives the image of lower grade paper. The actual situation was limited.
しかしながら、近年のOA機器の発達によるOA紙需要、
これに伴なう古紙発生の激増は、社会問題にまで発展
し、OA紙を中心に広汎な分野での再生紙使用の要望が高
まって来ている。However, demand for OA paper due to the development of OA equipment in recent years,
This has led to a sharp increase in the generation of waste paper, which has developed into a social problem, and there has been an increasing demand for the use of recycled paper in a wide range of fields, especially OA paper.
従来から行われている古紙の脱墨は、まず印刷インキ
の繊維よりの脱離又は分散を主眼とするものであるが、
難脱離性のインキが残ると黒ひげとなり、インキが細か
く分散すると、全体がくすんでしまう。このようになる
と、脱墨剤と共に漂白剤を添加しようが、脱墨後に漂白
を行おうが漂白の効果が上らない。また、脱墨後の漂白
において、漂白剤を多量に添加し、無理に白色度を上げ
ようとしても、漂白の効果が悪いため、排水中のCCDが
増大して実用化は困難であった。近年オフセット印刷が
多くなり、オフセット印刷古紙のインキは難脱離性のた
め、種々の工夫が試みられているが、新聞古紙から高白
色度の古紙パルプを得ることは極めて困難で、これの解
決を求められていた。The deinking of waste paper, which has been performed conventionally, is primarily intended for detachment or dispersion of printing ink from fibers.
If the hard-to-remove ink remains, it becomes a black whisker, and if the ink is finely dispersed, the whole becomes dull. In this case, bleaching may be added together with the deinking agent, or bleaching may be performed after deinking, but the bleaching effect is not improved. Further, in the bleaching after deinking, even if a large amount of a bleaching agent is added to forcibly increase the whiteness, the effect of the bleaching is poor, and the CCD in the drainage increases, which makes practical use difficult. In recent years, offset printing has increased, and various attempts have been made to use offset printing ink because the ink is difficult to remove. However, it is extremely difficult to obtain high whiteness waste paper pulp from used newspaper. Was required.
［発明が解決しようとする課題］ 現状の出版物の傾向を見ると、従来からの文章主体の
雑誌は次第に縮小傾向にあり、世はあげてカラー化、ビ
ジュアル化の方向にある。この動向は印刷効果を上げる
ために、印刷紙はますます高白色度を要求され、白色度
の低い古紙パルプはますます見向きもされなくなるとい
う悪循環を生んできている。[Problems to be Solved by the Invention] Looking at the current trends in publications, conventional magazines mainly composed of texts are gradually shrinking, and the world is moving toward colorization and visualization. This trend has created a vicious cycle in which printed papers are required to have higher and higher whiteness in order to enhance the printing effect, and waste paper pulp having lower whiteness is being increasingly viewed.
そこで、古紙のDIPを漂白して白色度を上げようとし
ても先に述べたように、排水のCCDが増大し、排水設備
に巨額の設備投資を必要とするので採算が合わないとい
う問題がある。Therefore, as mentioned above, even if we try to increase the whiteness by bleaching the DIP of waste paper, there is a problem that the CCD of drainage increases and requires huge capital investment in drainage equipment, so it is not profitable .
また、現状の出版界のもう一つの傾向として、紙の色
目は黄味より青味が好まれるという傾向があり、現状の
漂白では薬品を多くしても黄味が強くなるので、高白色
度の古紙パルプを得ることはできなかった。Another trend in the current publishing world is that the color of paper tends to be more bluish than yellowish, and with the current bleaching, yellowing becomes stronger even with more chemicals. Was not able to obtain waste paper pulp.
本発明者等は上述の古紙の有効利用、印刷紙の高白色
度化、排水負荷の軽減という相反する性能を満足させる
べく、鋭意研究の結果、本発明の完成をみたものであ
る。すなわち、本発明は上述の問題点を解消し、印刷古
紙特に新聞古紙より得られたDIPを更に漂白を行い、漂
白工程における排水負荷が軽減でき、しかも再生紙使用
増に対応できる高率配合可能な高白色度古紙パルプの製
造方法を提供することを目的とする。The present inventors have made intensive studies and completed the present invention as a result of satisfying the conflicting performances of effective use of waste paper, high whiteness of printing paper, and reduction of drainage load. In other words, the present invention solves the above-mentioned problems, and further performs bleaching of DIP obtained from used printing paper, especially used newspaper, so that the drainage load in the bleaching process can be reduced, and a high mixing ratio that can cope with an increase in the use of recycled paper is possible. It is an object of the present invention to provide a method for producing high-whiteness waste paper pulp.
［課題を解決するための手段］ 本発明においては、印刷古紙から高白色度のパルプを
得る方法として、脱墨と漂白を同時に行う方法では、白
色度の向上に限界があるので、脱墨工程と漂白工程を完
全に分離する。まず脱墨工程ではこれまでの公知の技術
を駆使して、できるだけインキを除去して黒ひげ等の少
ないDIPを得る。次にこのDIPを漂白するに際し、高白色
度が得られ且つ排水CCDの少ない漂白条件として、下記
方法が優れていることを見出した。[Means for Solving the Problems] In the present invention, as a method of obtaining pulp of high whiteness from waste printing paper, a method of simultaneously performing deinking and bleaching has a limit in improving whiteness. And the bleaching process is completely separated. First, in the deinking process, the ink is removed as much as possible by making full use of the well-known technique so far to obtain a DIP with little black whiskers or the like. Next, when bleaching this DIP, it was found that the following method was excellent as a bleaching condition in which high whiteness was obtained and the amount of waste water CCD was small.
すなわち、本発明は、印刷古紙を脱墨して得られた古
紙脱墨パルプを脱水し、更に（Ａ）一軸のローター周面
に送り刃と戻り刃が配置され、且つステーターの刃と各
刃間に充分な間隙を有した高速・高濃度ミキサーを使用
し、パルプ濃度25％以上で、パルプと酸化型漂白剤を常
温ないし加温下で混合する工程、（Ｂ）前記漂白剤が混
合されたパルプをパルプ濃度25％以上でソーキングして
漂白する工程、（Ｃ）前記Ｂ工程で漂白されたパルプを
更に、パルプ濃度８〜20％で還元型漂白剤としてホルム
アミジンスルフィン酸を使用して漂白する工程、という
（Ａ）〜（Ｃ）の工程により漂白して高白色度古紙パル
プを製造する方法ものである。That is, the present invention dewaters waste paper deinked pulp obtained by deinking printed waste paper, and further comprises (A) a feed blade and a return blade arranged on a uniaxial rotor peripheral surface, and a stator blade and each blade. Mixing the pulp and the oxidized bleach at room temperature or under heating at a pulp concentration of 25% or more by using a high-speed and high-concentration mixer having a sufficient gap between them, (B) mixing the bleaching agent (C) the pulp bleached in the step B is further subjected to a pulp concentration of 8 to 20% using formamidine sulfinic acid as a reducing bleaching agent. This is a method of producing bleached pulp with high whiteness by performing bleaching in the steps (A) to (C) of the bleaching step.
ホルムアミジンスルフィン酸を使用する還元漂白工程
は、温度50〜100℃で10〜90分漂白することを特徴とす
る。また 印刷古紙が新聞古紙であることを特徴とするものであ
る。The reduction bleaching step using formamidine sulfinic acid is characterized by bleaching at a temperature of 50 to 100 ° C. for 10 to 90 minutes. In addition, the printing paper is used newspaper paper.
これまで印刷古紙より高白色度のパルプを得ようとす
る試みは種々なされており、漂白剤を脱墨剤と共に使用
する方法もまた脱墨後に漂白することも知られている。
また、更に脱墨時にニーダー等で機械的処理を行うこと
も知られているが、これもオフセット印刷のような難脱
離性の印刷インキを機械的に繊維から引剥そうという目
的のためであって、漂白のためではない。There have been various attempts to obtain pulp having higher whiteness than used waste paper, and it is known that a method using a bleaching agent together with a deinking agent and bleaching after deinking are also known.
It is also known that a mechanical treatment is performed with a kneader or the like at the time of deinking, but this is also for the purpose of mechanically peeling off hard-to-removable printing ink such as offset printing from the fiber. Yes, not for bleaching.
例えば特開昭54−120705号公報では第１段階で脱墨剤
と共にアルカリ添加し、３時間以上ソーキング後、繊維
から浮き上ったインキを引剥すために混合機（ミキサ
ー）又は捏和機（ニーダー）で攪拌処理を行うことによ
り黒ひげの減少をはかる脱墨方法を提案している。また
特開昭55−40850号公報ではオフセット古紙を含有した
印刷古紙に脱墨剤及び過酸化水素漂白剤を添加し、約15
％以上のパルプ濃度並びに5.0g/l（NaOHとして）以上の
アルカリ濃度において、ニーダー、ミキサー又はディス
パーザを使用し、加温下で圧縮力を与えながら機械的攪
拌を行う印刷古紙の脱墨方法を提案している。この提案
は脱墨と漂白を同時に行う際に、ニーダー、ミキサーな
どを使用するものであるが、その目的はインキを繊維か
ら引剥がすためであり、機械的処理後、ソーキング、フ
ローテーションと脱墨工程が続くものである。また、更
にその改良として特開昭63−28992号では機械的攪拌
後、ソーキングを行った後、再度機械的攪拌を行う印刷
古紙の脱墨方法を提案しているが、これも機械的処理後
にフローテーション工程が続くものであり、いずれもイ
ンキを繊維より引剥がすか、分散させることを主眼にし
ているもので、脱墨後のパルプを漂白して高白色度パル
プを得るものではない。For example, in Japanese Patent Application Laid-Open No. 54-120705, an alkali is added together with a deinking agent in the first stage, and after soaking for 3 hours or more, a mixer or a kneading machine (a mixer) or a kneader ( Proposal of a deinking method for reducing blackbeard by performing a stirring process with a kneader. In Japanese Patent Application Laid-Open No. 55-40850, a deinking agent and a hydrogen peroxide bleaching agent are added to printed waste paper containing offset waste paper, and about 15
% Of pulp concentration of more than 5.0% / l and alkali concentration of more than 5.0g / l (as NaOH), using a kneader, mixer or disperser, and mechanically agitating while applying compressive force while heating. is suggesting. This proposal uses a kneader, a mixer, etc. when performing deinking and bleaching at the same time, but the purpose is to peel off the ink from the fiber, and after mechanical treatment, soaking, flotation and deinking The process continues. As a further improvement, Japanese Patent Application Laid-Open No. 63-28992 proposes a method of deinking printed waste paper in which mechanical stirring is performed, soaking is performed, and then mechanical stirring is performed again. The flotation step is continued, and all of them mainly focus on peeling or dispersing the ink from the fiber, but do not bleach the pulp after deinking to obtain a high whiteness pulp.
本発明においては、上述の酸化型漂白剤による漂白に
引きつづき還元型漂白剤であるホルムアミジンスルフィ
ン酸（以下FASと略称する）による漂白を行う。In the present invention, bleaching is carried out with formamidinesulfinic acid (hereinafter abbreviated as FAS), which is a reducing bleach, following the bleaching with the above-mentioned oxidizing bleach.
従来からFAS使用の提案が知られ、特開昭61−194289
号は二酸化チオ尿素（FASと同一物）とアルカリ剤とか
らなる薬剤を用い古紙を40〜80℃の温度で蒸解する古紙
の再生方法であり、アルカリ剤に対して強い抵抗を持つ
着色インクの還元脱色と古紙繊維の漂白とを同時に行う
ものであるが、処理温度60℃で３〜５時間と処理時間が
長い難点がある。また、特開昭62−276094号公報は、パ
ルプ着色された紙及び感圧複写紙（ノーカーボン紙）を
パルプ濃度２〜20％及び温度20〜80℃でFASを使用して
脱色する方法であるが、染料でパルプを着色した紙やノ
ーカーボン紙は通常の脱墨方法では効果がないため、FA
Sを使用して脱色するもので、印刷古紙を対象としたも
のではない。Conventionally, a proposal for the use of FAS has been known.
No. is a recycling method for waste paper, in which waste paper is digested at a temperature of 40 to 80 ° C using a chemical consisting of thiourea dioxide (identical to FAS) and an alkaline agent. Although reduction bleaching and bleaching of waste paper fibers are performed simultaneously, there is a drawback that the processing time is long at 3 to 5 hours at a processing temperature of 60 ° C. JP-A-62-276094 discloses a method of decolorizing pulp-colored paper and pressure-sensitive copying paper (carbon-free paper) using a FAS at a pulp concentration of 2 to 20% and a temperature of 20 to 80 ° C. However, paper colored with pulp with dye or carbonless paper is not effective with the normal deinking method.
It is decolorized using S, not for used printed paper.
以下、本発明の製造方法について説明する。 Hereinafter, the manufacturing method of the present invention will be described.
本発明者等は、まずDIPの酸化漂白について検討した
が、過酸化水素添加率を増加させると、白色度はある程
度上昇するものの、添加率増加と共に排水CODが急激に
増加し、実際に工業的に使用する訳にはいかない。The present inventors first studied the oxidative bleaching of DIP, but when the hydrogen peroxide addition rate was increased, the whiteness increased to some extent, but the COD of the wastewater increased sharply with the increase in the addition rate, and in fact, industrial I can not use it for.
排水CCDを減少させるには、漂白時のパルプ濃度をで
きるだけ高濃度とし、排水中に溶出する成分を少なくす
るのが効果的であるが、漂白時のパルプ濃度と白色度の
関係を調べると、パルプ濃度を上げるに従って白色度は
向上するが、30〜40％と濃度を上げても白色度は上昇し
なくなる。In order to reduce wastewater CCD, it is effective to make the pulp concentration at the time of bleaching as high as possible and to reduce the components eluted in the wastewater.However, when examining the relationship between the pulp concentration at the time of bleaching and the whiteness, Although the whiteness increases as the pulp concentration increases, the whiteness does not increase even if the concentration is increased to 30 to 40%.
本発明者等は、これらの白色度上昇が飽和する原因は
パルプ濃度が高いことによるパルプ繊維と漂白剤との接
触が不充分である点に着目し、高濃度でも漂白剤を均一
にパルプに接触させる方法、即ち、DIPを脱水して25％
以上の高濃度とし、これに漂白剤を添加後、常温ないし
加温下で、１軸もしくは２軸の高速、高濃度ミキサー
（以下本発明では、一般にミキサー、プロセッサー等と
称されるミキシング用の機械を総称してミキサーと呼
ぶ）で漂白する方法を考えた。The present inventors have noted that the cause of the saturation of the increase in whiteness is that the contact between the pulp fiber and the bleaching agent is insufficient due to the high pulp concentration. Method of contact, ie, dehydration of DIP and 25%
After adding the bleaching agent to the above-mentioned high concentration and adding the bleaching agent thereto, at room temperature or under heating, a single-axis or two-axis high-speed, high-density mixer (hereinafter, generally referred to as a mixer, a processor, etc., for mixing) (The machine is collectively called a mixer).
通常脱墨工程で使用するミキサー、ニーダーは繊維よ
りインキを引剥がすため、パルプに圧縮力を与えるか、
繊維同志が適度の摩擦を受けることが望ましく、そのた
めには１軸又は２軸の刃間に適度の食い込みがあり、低
速で充分繊維に圧縮力もしくは摩擦を与えるニーダーか
ディスパーザー、２軸ミキサー等が使用され、且つ処理
温度も高温の方がインキが脱落しやすいので好ましいの
が普通である。Mixers and kneaders usually used in the deinking process apply compressive force to the pulp to separate the ink from the fiber,
It is desirable that the fibers receive moderate friction, so that there is a moderate bite between the blades of one or two shafts, a kneader or disperser that gives sufficient compressive force or friction to the fiber at low speed, a two-shaft mixer, etc. In general, it is preferable that the ink is used at a high processing temperature because the ink is easily dropped off.
しかしながら、本発明においては繊維に圧縮力ないし
は摩擦を与えるのではなく、高濃度のパルプに漂白剤を
均一に混合することを目的としているので、使用するミ
キサーは繊維に摩擦を与えぬよう１軸又は２軸の刃間に
充分空間があり、且つ高速で回転して短時間で均一に混
合できるタイプが好ましい。However, in the present invention, the purpose of the present invention is not to apply compressive force or friction to the fiber, but to uniformly mix the bleach into the high-concentration pulp. Alternatively, a type in which there is sufficient space between the blades of the two shafts, and which can rotate at high speed and uniformly mix in a short time is preferable.
従って、１軸ならばローターに送り刃と戻し刃を有
し、且つステーターの刃との隙間が充分にとれ、高速回
転する１軸ミキサーであるマイカープロセッサ（石川島
産業機械（株）製）が最も好ましく、また２軸の刃間を
広くとれ高速回転が可能なフローターパルパーでもよ
い。更に処理温度もインキを剥がすことが目的ではない
ので、必ずしも高温である必要はなく、常温でも充分に
混合の効果は認められる。Therefore, if the rotor is a single-shaft, the rotor is provided with a feed blade and a return blade, and the clearance between the rotor and the stator blade is sufficiently large. It is preferable to use a floater pulper that is capable of rotating at high speed with a wide gap between the two blades. Further, since the processing temperature is not the purpose of removing the ink, it is not necessarily required to be a high temperature, and a sufficient mixing effect can be recognized even at a normal temperature.
既に述べたように、従来の漂白方法ではソーキング濃
度（ソーキング時のパルプ濃度）が20％で白色度の上昇
が止まるが、本発明ではソーキング濃度が25％〜30％も
しくはそれ以上でも白色度が増加することが分かった。As described above, in the conventional bleaching method, the increase in whiteness is stopped at a soaking concentration (pulp concentration at the time of soaking) of 20%. However, in the present invention, the whiteness is reduced even at a soaking concentration of 25% to 30% or more. It was found to increase.
従って、本発明においては得られるDIPの白色度が同
一であれば、従来の漂白方法に比較してアルカリ使用
量、H2O使用量を削減することができ、排水CODを半分に
減少することができる。Therefore, in the present invention, when the whiteness of the obtained DIP is the same, the amount of alkali used and the amount of H 2 O used can be reduced as compared with the conventional bleaching method, and the COD of the wastewater can be reduced by half. Can be.
上述のようにDIPを酸化型漂白剤で漂白するに際し、
高濃度で高速ミキサー処理し、高濃度ソーキングすると
排水負荷を増大しないで白色度70以上の古紙パルプを得
られることが分かったが、これを更に高白色化するため
に還元型漂白剤を使用することが、本発明の特徴で、か
つ還元型漂白剤としてホルムアミジンスルフィン酸（FA
S）を使用するものである。When bleaching DIP with oxidized bleach as described above,
It was found that high-concentration high-speed mixer treatment and high-concentration soaking can provide wastepaper pulp with a whiteness of 70 or more without increasing drainage load, but use a reducing bleach to further increase the whiteness. This is a feature of the present invention, and formamidine sulfinic acid (FA
S).
還元型漂白剤としては、通常ハイドロサルファイトが
使用されるが、この薬剤は酸化され易く、パルプ濃度が
高いと空気中の酸素に触れる機会が多くなり好ましくな
いので、通常４％程度のパルプ濃度で漂白される。この
ような薄い濃度だけ高白色度にするため、ハイドロサル
ファイトの添加量をふやそうとしても水量が多いため、
対パルプ量としてはそれ程多くすることはできず、白色
度の向上に限界があり、また漂白後色戻りも大きい。Hydrosulfite is usually used as a reducing bleaching agent. However, this agent is easily oxidized, and if the pulp concentration is high, the chance of contact with oxygen in the air increases, which is not preferable. Bleached. In order to increase the whiteness only at such a low concentration, the amount of water is large even if the amount of hydrosulfite added is increased,
The amount of pulp cannot be so large, there is a limit in improving the whiteness, and the color return after bleaching is large.
そこで、本発明者等は、還元型漂白剤の一つとしてホ
ルムアミジンスルフィン酸（FAS）の利用を考えたので
ある。FASは別名二酸化チオ尿素とも称され、常温では
安定な白色粉末で還元性はないが、熱又はアルカリによ
り分解してスルフィン酸を発生させ、強力な還元力を発
揮する。従って、ハイドロサルファイトのように、酸化
分解のおそれもなく、FAS添加後、アルカリを添加し、
加温することによってハイドロサルファイトでは得られ
ない高白色度を得ることができる。Therefore, the present inventors have considered the use of formamidine sulfinic acid (FAS) as one of the reduced bleaching agents. FAS, also called thiourea dioxide, is a white powder that is stable at room temperature and has no reducibility, but decomposes with heat or alkali to generate sulfinic acid and exerts strong reducing power. Therefore, unlike hydrosulfite, there is no fear of oxidative decomposition, and after addition of FAS, alkali is added,
By heating, high whiteness that cannot be obtained with hydrosulfite can be obtained.
本発明において、DIPを酸化漂白したパルプを、更にF
ASにより還元漂白する条件は次の通りである。In the present invention, the pulp obtained by oxidatively bleaching DIP is further treated with F
The conditions for reduction bleaching by AS are as follows.
即ち、FASはハイドロサルファイトより安定なため、
４％程度の低濃度とするより、パルプ濃度15％とした方
が白色度がより向上するが、濃度30％にすると低下する
ので、８〜20％が好ましい。高濃度にすると低下するの
は、ハイドロサルファイトと同じく空気酸化によるもの
で濃度30％でも空気を窒素で置換すると白色度の低下は
ない。In other words, FAS is more stable than hydrosulfite,
Whiteness is more improved when the pulp concentration is 15% than when the pulp concentration is as low as about 4%, but is reduced when the pulp concentration is 30%. As with hydrosulfite, the decrease is caused by air oxidation. Even when the concentration is 30%, there is no decrease in whiteness when air is replaced with nitrogen.
また、反応温度は40℃,60℃,80℃でテストした結果、
80℃が最も良好であるが、本発明では実用上50〜100℃
の範囲でよい。In addition, the reaction temperature was tested at 40 ° C, 60 ° C, 80 ° C,
80 ° C is the best, but in the present invention, it is practically 50-100 ° C.
Range.
反応時間は15分でかなり白色度が上昇し、60分で充分
白色度が上がり、24時間処理すると白色度が低下するの
で、10〜90分が好ましい範囲である。The reaction time is considerably increased in 15 minutes, sufficiently increased in 60 minutes, and decreased in whiteness when treated for 24 hours. Therefore, 10 to 90 minutes is a preferable range.
FASで漂白したパルプは、H2O2漂白のパルプに比べ
て、青味の傾向で、現状の出版界の好みの傾向にマッチ
した高白色度のパルプを得ることができる。The pulp bleached with FAS has a bluish tendency compared to the pulp bleached with H 2 O 2 , and it is possible to obtain a pulp with high whiteness that matches the current tendency of the publishing industry.
本発明の高白色度古紙パルプを得る方法に用いるDIP
の原料となる印刷古紙は新聞古紙を対象とすると効果的
である。本発明の方法では、新聞古紙を脱墨したDIPを
更に漂白して白色度75以上の高白色度パルプが得られる
点に特徴があり、白色度の低い新聞古紙からこのような
高白色度パルプを得ることは従来なし得なかったことで
ある。DIP used in the method for obtaining high whiteness waste paper pulp of the present invention
It is effective to use used newspaper as used as raw material for newspaper. The method of the present invention is characterized in that DIP obtained by deinking used newspaper is further bleached to obtain a high-whiteness pulp having a whiteness of 75 or more. Is something that could not be done before.
本発明の方法に用いるDIPは従来知られる脱墨方法に
より脱墨したDIPでよいが、できるだけ白色度の高いも
のが得られる脱墨方法で脱墨したDIPを用いた方が好ま
しいことは当然である。The DIP used in the method of the present invention may be a DIP that has been deinked by a conventionally known deinking method.However, it is naturally preferable to use a DIP that has been deinked by a deinking method that obtains as high a whiteness as possible. is there.
［実施例］ 以下に本発明の実施例を示す。[Example] An example of the present invention will be described below.
DIPの調整 新聞古紙を下記の従来の脱墨方法により脱墨した。オ
フセット印刷新聞古紙に水を加えて試験用パルパーで濃
度５％になるように離解し、古紙風乾重量に対し、NaOH
l％、Na2SiO34％及び界面活性剤（東邦化学工業（株）F
T301 Ａ）0.3％を添加して攪拌した後、濃度20％に脱
水した。更にこれにNaOH2％、Na2SiO36％及び界面活性
剤（前記FT301A）0.1％、H2O2（濃度60％として）２％
添加して温度45℃で１時間ソーキングを行った。Adjustment of DIP Waste newspaper was deinked by the following conventional deinking method. Add water to offset-printed newspaper waste paper and disintegrate it to a concentration of 5% with a test pulper.
l%, Na 2 SiO 3 4% and surfactant (Toho Chemical Industry Co., Ltd. F
T301 A) After adding 0.3% and stirring, the mixture was dehydrated to a concentration of 20%. Further, 2 % of NaOH, 6% of Na 2 SiO 3 , 0.1% of a surfactant (FT301A), 2 % of H 2 O 2 (assuming a concentration of 60%)
After the addition, soaking was performed at a temperature of 45 ° C. for 1 hour.
ソーキング後濃度４％に希釈し、更に１％に希釈し、
試験用フローテーターを用いて20分フローテーション処
理を行い、脱水してDIPを得た。得られたDIPの白色度は
62％％であった。After soaking, dilute to 4% concentration, further dilute to 1%,
Flotation treatment was performed for 20 minutes using a test flotator, and dehydration was performed to obtain DIP. The whiteness of the obtained DIP is
It was 62 %%.
このDIPを用いて本発明の酸化漂白、還元漂白を行っ
た。Using this DIP, oxidative bleaching and reduction bleaching of the present invention were performed.
〔参考例１〕 この参考例１は、以下の各実施例の前段処理に相当す
るもので、前記で得たDIPを濃度30％水系スラリーにし
て、H2O2をDIP（風乾）に対し、４％添加してマイカー
プロセッサ（石川島産業機械（株）製）を通過させて充
分混合させた後、ソーキング濃度30％で３時間漂白を行
った。排水のCOD及び得られた漂白後のDIPの白色度を表
に示す。[Reference Example 1] This Reference Example 1 corresponds to the pretreatment of each of the following Examples, in which the DIP obtained above was converted into a 30% aqueous slurry, and H 2 O 2 was added to DIP (air-dried). After adding 4% and passing through a My Car Processor (manufactured by Ishikawajima Sangyo Kikai Co., Ltd.) to mix thoroughly, bleaching was performed at a soaking concentration of 30% for 3 hours. The COD of the wastewater and the whiteness of the resulting bleached DIP are shown in the table.
〔比較例１〕 参考例１において、マイカープロセッサの代りに試験
用ニーダーを使用した以外は参考例１と全く同様にして
漂白したDIPを得た。[Comparative Example 1] A bleached DIP was obtained in the same manner as in Reference Example 1, except that a test kneader was used instead of the my car processor.
〔比較例２〕 参考例１において、DIPのパルプ濃度を20％にして混
合と漂白を行った以外は参考例１と全く同様にして漂白
したDIPを得た。Comparative Example 2 A bleached DIP was obtained in exactly the same manner as in Reference Example 1, except that mixing and bleaching were performed with the pulp concentration of DIP being 20%.
〔実施例１〕 参考例１で得られた酸化漂白したDIPをパルプ濃度15
％にして、FASをDIP（風乾重量）に対し0.5％添加し、
温度80℃で60分漂白を行い、還元漂白されたDIPを得
た。[Example 1] The oxidized and bleached DIP obtained in Reference Example 1 was used at a pulp concentration of 15
%, FAS is added 0.5% to DIP (air dry weight),
Bleaching was performed at a temperature of 80 ° C. for 60 minutes to obtain reductively bleached DIP.
〔実施例２〕 参考例１で得られた酸化漂白したDIPを、実施例１に
おいて、FASをDIPに対し0.2％添加する以外は実施例１
と全く同様にして還元漂白されたDIPを得た。Example 2 The oxidized and bleached DIP obtained in Reference Example 1 was used in Example 1 except that FAS was added at 0.2% to DIP.
A reduction-bleached DIP was obtained in exactly the same manner as described above.
〔実施例３〕 参考例１において、パルプ濃度を25％にした以外は参
考例１と全く同様にして酸化漂白したDIPを得て、更に
このDIPを実施例１においてFAS添加量をDIPに対し0.2
％、パルプ濃度20％とした以外は実施例１と全く同様に
して還元漂白されたDIPを得た。Example 3 An oxidatively bleached DIP was obtained in the same manner as in Reference Example 1 except that the pulp concentration was changed to 25%. 0.2
% And a pulp concentration of 20%, and a reduction-bleached DIP was obtained in exactly the same manner as in Example 1.
〔実施例４〕 参考例１において、温度70℃でH2O2による漂白を行う
以外は、参考例１と全く同様にして酸化漂白したDIPを
得て、更にこのDIPを実施例１においてFAS添加量をDIP
に対し0.2％、パルプ濃度８％とした以外は実施例１と
全く同様にして還元漂白されたDIPを得た。Example 4 An oxidatively bleached DIP was obtained in the same manner as in Reference Example 1 except that bleaching with H 2 O 2 was performed at a temperature of 70 ° C. DIP addition amount
And a bleached DIP was obtained in exactly the same manner as in Example 1 except that the pulp concentration was 8%.
〔実施例５〕 参考例１で得られた酸化漂白したDIPを、実施例１に
おいてFAS添加量をDIPに対し0.2％、温度40℃とした以
外は実施例１と全く同様にして還元漂白されたDIPを得
た。Example 5 The oxidized and bleached DIP obtained in Reference Example 1 was subjected to reduction bleaching in exactly the same manner as in Example 1 except that the amount of FAS added was 0.2% of DIP and the temperature was 40 ° C. Got a DIP.
〔実施例６〕 参考例１で得られた酸化漂白したDIPを、実施例１に
おいてFAS添加量をDIPに対し0.2％、漂白時間を15分と
した以外は実施例１と全く同様にして還元漂白されたDI
Pを得た。Example 6 The oxidized and bleached DIP obtained in Reference Example 1 was reduced in the same manner as in Example 1 except that the amount of FAS added was 0.2% of DIP and the bleaching time was 15 minutes. Bleached DI
Got P.
〔実施例７〕 参考例１で得られた酸化漂白したDIPを、実施例１に
おいてFAS添加量をDIPに対し0.2％、漂白時間を180分と
した以外は実施例１と全く同様にして還元漂白されたDI
Pを得た。[Example 7] The oxidized and bleached DIP obtained in Reference Example 1 was reduced in the same manner as in Example 1 except that the amount of FAS added was 0.2% of DIP and the bleaching time was 180 minutes. Bleached DI
Got P.
〔比較例３〕 参考例１で得られた酸化漂白したDIPを、実施例１に
おいて使用したFASの代りにナトリウムハイドロサルフ
ァイト（濃度４％）をDIPに対し１％添加し、温度50
℃、時間60分で還元漂白を行う以外は実施例１と全く同
様にして還元漂白されたDIPを得た。Comparative Example 3 The oxidized and bleached DIP obtained in Reference Example 1 was replaced with sodium hydrosulfite (concentration: 4%) in an amount of 1% with respect to the DIP in place of the FAS used in Example 1.
A reduction-bleached DIP was obtained in exactly the same manner as in Example 1, except that the reduction bleaching was performed at 60 ° C. for 60 minutes.
〔比較例４〕 参考例１と全く同様にして酸化漂白して得られたパル
プを、パルプ濃度を30％にして再び参考例１と全く同様
な手順で酸化漂白を行って、２段酸化漂白されたDIPを
得た。[Comparative Example 4] A pulp obtained by oxidative bleaching in exactly the same manner as in Reference Example 1 was subjected to oxidative bleaching in the same procedure as in Reference Example 1 except that the pulp concentration was 30%, and two-stage oxidative bleaching was performed. Got a DIP.
比較例１、２、実施例１〜７及び比較例３、４で得ら
れた結果を表に示す。The results obtained in Comparative Examples 1 and 2, Examples 1 to 7 and Comparative Examples 3 and 4 are shown in the table.
［試験方法］ 排水COD JIS K0101による パルプ白色度 フォトボルト・メーターにより測定 色 調 村上式色差計により測定 表に示した結果によれば、本発明の酸化漂白方法を通
常の脱墨方法により得たDIPの漂白に適用（参考例１）
した結果、白色度76の比較的高白色度のパルプを得るこ
とができ、従来のニーダーで混合、漂白したもの（比較
例１）に比べて白色度が２ポイント向上し、しかも排水
CODが略半減した。[Test method] Wastewater COD Pulp whiteness according to JIS K0101 Measured by photobolt meter Color tone Measured by Murakami colorimeter According to the results shown in the table, the oxidative bleaching method of the present invention was obtained by a normal deinking method. Applied to DIP bleaching (Reference Example 1)
As a result, it was possible to obtain a pulp having a relatively high whiteness of 76 and a whiteness improved by 2 points as compared with a pulp mixed and bleached with a conventional kneader (Comparative Example 1).
COD has been reduced by almost half.
また、パルプ濃度を20％で深白を行うと（比較例２）
白色度がややさがる。When deep whitening is performed at a pulp concentration of 20% (Comparative Example 2)
Whiteness is slightly reduced.
本発明方法により、前記の酸化漂白方法で漂白したDI
Pを更にFASにより還元漂白を行う（実施例１）とパルプ
白色度は81ポイントと80を越え、FAS添加量は0.2％（実
施例２）でも白色度80が得られ、パルプ濃度25％で酸化
漂白を行っても（実施例３）白色度79になる。According to the method of the present invention, DI bleached by the oxidative bleaching method described above
When P was further reduced and bleached with FAS (Example 1), the pulp brightness reached 81 points and exceeded 80, and even when the FAS content was 0.2% (Example 2), a brightness of 80 was obtained. Oxidative bleaching (Example 3) gives a whiteness of 79.
還元漂白のパルプ温度を８％（実施例４）で行うと、
実施例１や実施例２よりも白色度１ポイント下り、ま
た、還元漂白の温度を40℃にする（実施例５）と白色度
は３ポイント近く下るので、還元漂白のパルプ濃度は10
％以上、温度は50℃以上あることがより好ましい。When the pulp temperature for reduction bleaching is 8% (Example 4),
When the bleaching temperature is reduced to 40 ° C. (Example 5), the whiteness is reduced by nearly 3 points, and the pulp concentration in the reduced bleaching is 10 points.
% Or more, and the temperature is more preferably 50 ° C. or more.
更に還元漂白の時間は15分（実施例６）で白色度79
で、10分以上が好ましいが180分（実施例７）と余り長
くすると白色度はむしろ低下するので、90分程度でとど
めておくことが好ましい。Further, the reduction bleaching time was 15 minutes (Example 6) and the whiteness was 79.
However, it is preferable that the time be 10 minutes or longer, but if the time is too long, such as 180 minutes (Example 7), the whiteness is rather lowered.
参考例の酸化漂白を行ったDIPを、従来のハイドロサ
ルファイトで漂白（比較例３）を行った場合の白色度は
１ポイント程度の上昇にとどまる。また、参考例１の酸
化漂白を繰り返し２段で行う（比較例４）と、後段でFA
Sによる還元漂白を行う実施例１より白色度が低く、色
目も黄味で排水CODも多くなる。When the bleached DIP of the reference example was bleached with a conventional hydrosulfite (Comparative Example 3), the whiteness increased by only about 1 point. When the oxidative bleaching of Reference Example 1 was repeated in two stages (Comparative Example 4), FA
The whiteness is lower than that of Example 1 in which the reduction bleaching is performed by S, the color is yellowish, and the wastewater COD increases.
［発明の効果］ 上記のように、本発明の製造方法は、印刷古紙特に新
聞古紙より得られたDIPを酸化漂白とFASによる還元漂白
を行って、漂白工程における排水負荷が軽減でき、しか
も再生紙使用増に対応できる高率配合可能な高白色度パ
ルプを得ることができる。[Effects of the Invention] As described above, the production method of the present invention can reduce the drainage load in the bleaching step by performing oxidative bleaching and reduction bleaching with FAS on DIP obtained from used printing paper, particularly newsprint. It is possible to obtain a high whiteness pulp that can be blended at a high rate and can cope with an increase in paper usage.
Claims (2)
プを脱水し、更に下記Ａ〜Ｃ工程により漂白することを
特徴とする高白色度古紙パルプの製造方法。 （Ａ）一軸のローター周面に送り刃と戻り刃が配置さ
れ、且つステーターの刃と各刃間に充分な間隙を有した
高速・高濃度ミキサーを使用し、パルプ濃度25％以上
で、パルプと酸化型漂白剤を常温ないし加温下で混合す
る工程。 （Ｂ）前記漂白剤が混合されたパルプをパルプ濃度25％
以上でソーキングして漂白する工程。 （Ｃ）前記Ｂ工程で漂白されたパルプを更に、還元型漂
白剤としてホルムアミジンスルフィン酸を使用してパル
プ濃度８〜20％で漂白する工程。1. A method for producing high-whiteness waste paper pulp, comprising dewatering waste paper deinked pulp obtained by deinking printed waste paper, and bleaching it in the following steps A to C. (A) Using a high-speed, high-concentration mixer in which a feed blade and a return blade are arranged on the circumference of a uniaxial rotor, and which has a sufficient gap between the stator blade and each blade. Mixing the oxidized bleach and the oxidized bleach at room temperature or under heating. (B) The pulp mixed with the bleaching agent has a pulp concentration of 25%.
This is the process of soaking and bleaching. (C) a step of further bleaching the pulp bleached in the above step B at a pulp concentration of 8 to 20% using formamidine sulfinic acid as a reducing bleach.
る還元漂白工程は、温度50〜100℃で10〜90分漂白する
ことを特徴とする請求項１記載の高白色度古紙パルプの
製造方法。2. The method for producing high-brightness waste paper pulp according to claim 1, wherein the reductive bleaching step using formamidine sulfinic acid is bleached at a temperature of 50 to 100 ° C. for 10 to 90 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14991290A JP3098021B2 (en) | 1990-06-11 | 1990-06-11 | How to make high brightness waste paper pulp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14991290A JP3098021B2 (en) | 1990-06-11 | 1990-06-11 | How to make high brightness waste paper pulp |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7380499A Division JP3166760B2 (en) | 1990-06-11 | 1999-03-18 | Manufacturing method of high whiteness waste paper pulp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0450391A JPH0450391A (en) | 1992-02-19 |
| JP3098021B2 true JP3098021B2 (en) | 2000-10-10 |
Family
ID=15485309
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14991290A Expired - Fee Related JP3098021B2 (en) | 1990-06-11 | 1990-06-11 | How to make high brightness waste paper pulp |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3098021B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6153300A (en) * | 1994-04-18 | 2000-11-28 | Ahlstrom Machinery, Inc. | Bleaching cellulose pulp having cleanliness which varies significantly over time using at least two different bleaching stages and bleaching chemicals |
| JP4677344B2 (en) * | 2005-12-28 | 2011-04-27 | 大王製紙株式会社 | Method for producing waste paper pulp |
| JP4760446B2 (en) * | 2006-02-28 | 2011-08-31 | 王子製紙株式会社 | Method for producing waste paper pulp |
-
1990
- 1990-06-11 JP JP14991290A patent/JP3098021B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0450391A (en) | 1992-02-19 |
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