JPH11269788A - Fluorescence elimination of fluorescent dye-containing old paper or papermaking white water - Google Patents
Fluorescence elimination of fluorescent dye-containing old paper or papermaking white waterInfo
- Publication number
- JPH11269788A JPH11269788A JP7006398A JP7006398A JPH11269788A JP H11269788 A JPH11269788 A JP H11269788A JP 7006398 A JP7006398 A JP 7006398A JP 7006398 A JP7006398 A JP 7006398A JP H11269788 A JPH11269788 A JP H11269788A
- Authority
- JP
- Japan
- Prior art keywords
- fluorescent dye
- chlorine
- white water
- fluorescence
- pulp
- 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.)
- Granted
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、蛍光染料を含有す
る古紙または抄紙白水の蛍光消去法に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescence elimination method for waste paper or papermaking white water containing a fluorescent dye.
【０００２】[0002]
【従来の技術】従来、古紙パルプは、木材パルプととも
に製紙原料として使用されている。古紙パルプは、主に
新聞、雑誌、トイレットペーパー等の白色度の余り要求
されない下級紙にての利用であった。しかし、近年、環
境保護、資源の再利用などにより古紙の再生パルプ化が
重要視されるようになってきた。2. Description of the Related Art Conventionally, waste paper pulp has been used together with wood pulp as a raw material for papermaking. Recovered paper pulp was mainly used for lower grade paper, such as newspapers, magazines, and toilet paper, which does not require much whiteness. However, in recent years, the importance of recycled pulping of waste paper has become more important due to environmental protection and resource reuse.
【０００３】最近の古紙は、印刷の高速化、美粧化など
に対応した印刷インキの改良および印刷形式の進歩、即
ちオフセット、凸版、レーザーなどにより紙とインキの
付着が強く脱墨しにくい傾向にある。さらに、紫外線硬
化樹脂、熱硬化樹脂などの表面加工により離解しにくく
従来の技術では、再生パルプ化がますます困難となって
いる。Recently, used paper has been improved in printing inks and printing styles in response to high-speed printing, cosmetics, etc., that is, the ink adheres strongly to the paper due to offset, letterpress, laser, etc., and the ink tends to be hardly deinked. is there. Furthermore, it is difficult to disintegrate due to the surface processing of an ultraviolet curable resin, a thermosetting resin, or the like, and it is increasingly difficult to make recycled pulps with the conventional technology.
【０００４】印刷古紙やオフィス古紙中には、蛍光染料
を含有するチラシやカタログなどが多くみられる。これ
ら蛍光染料を含有する古紙は、常法の脱墨漂白では脱色
しがたい。これらの混入が、白色度の低下、色調合わせ
の難しさ、紙面着色異物の要因の１つとなっている。そ
のため、蛍光染料を含有する古紙は、オフィス古紙や印
刷古紙などに混入した場合、離解工程前に人手による抜
き取り作業に頼って除去されているのが現状である。[0004] In printed waste paper and office waste paper, there are many flyers and catalogs containing a fluorescent dye. Waste paper containing these fluorescent dyes is difficult to decolor by conventional deinking and bleaching. These contaminations are one of the causes of a decrease in whiteness, difficulty in color matching, and coloring foreign matter on the paper surface. For this reason, at present, when waste paper containing a fluorescent dye is mixed into waste office paper, waste printed paper, or the like, it is manually removed prior to the disaggregation process by relying on a manual extraction operation.
【０００５】蛍光染料の消去方法として、例えば、特開
昭６２−９７９９３号公報では、離解された古紙を水酸
化ナトリウム溶液にてｐＨ１０以上に調整し、次いで次
亜塩素酸ナトリウム溶液を添加し、常温から６０℃以内
の温度下で貯留して蛍光染料を消去する方法が開示され
ている。しかし、この方法では蛍光消去は不十分なだけ
でなく、褪色（黄化現象）とセルロースの損傷が起こ
る。As a method for erasing a fluorescent dye, for example, in Japanese Patent Application Laid-Open No. Sho 62-97993, a disintegrated waste paper is adjusted to pH 10 or more with a sodium hydroxide solution, and then a sodium hypochlorite solution is added. A method for erasing a fluorescent dye by storing at a temperature within 60 ° C. from room temperature is disclosed. However, this method is not only insufficient for fluorescence extinction, but also causes discoloration (yellowing phenomenon) and damage to cellulose.
【０００６】また、特公昭４８−１６９３号公報では、
ジクロールイソシアヌール酸塩により、４，４’−ジア
ミノスチルベンスルファン酸誘導体からなる蛍光増白剤
を含有する古紙からの蛍光を消去する技術が開示されて
いる。しかし、ジクロールイソシアヌール酸塩は、塩素
化合物のためにＡＯＸ（吸着性有機ハロゲン化合物）が
排水中に多量に発生し、問題となる。In Japanese Patent Publication No. 48-1693,
A technique for eliminating fluorescence from waste paper containing a fluorescent whitening agent composed of a 4,4'-diaminostilbene sulfanic acid derivative using dichlor isocyanurate is disclosed. However, dichlor isocyanurate is a problem because a large amount of AOX (adsorbable organic halogen compound) is generated in wastewater due to a chlorine compound.
【０００７】さらに、特公平８−１９６３０号公報で
は、古紙スラリーに対して特定の条件下で二酸化塩素処
理によって古紙中の蛍光を消去する方法が開示されてい
る。しかし、現状の古紙処理設備では、過酸化水素、次
亜塩素酸ソーダによる漂白が一般的であり、二酸化塩素
の使用は設備上非常に難しいだけでなく、コスト高につ
ながるなどの欠点がある。Furthermore, Japanese Patent Publication No. Hei 8-19630 discloses a method of eliminating fluorescence in waste paper by treating the waste paper slurry with chlorine dioxide under specific conditions. However, in current waste paper processing equipment, bleaching with hydrogen peroxide and sodium hypochlorite is common, and the use of chlorine dioxide is not only extremely difficult in terms of equipment, but also has drawbacks such as high costs.
【０００８】[0008]
【発明が解決しようとする課題】本発明の目的は、前記
従来技術の問題点を解決し、古紙パルプをクラフトパル
プ漂白工程に混合処理して蛍光を消去することでバージ
ンパルプと変わらない高品質のものを得ることができ
る。また、蛍光染料を含有する抄紙白水もクラフトパル
プ漂白工程の塩素系白水と混合することで蛍光を消去で
き、抄紙白水の再利用に伴う節水を提供することができ
る。SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the prior art and to mix waste paper pulp in a kraft pulp bleaching process to eliminate fluorescence, thereby providing a high quality virgin pulp similar to virgin pulp. Can be obtained. Further, by mixing papermaking white water containing a fluorescent dye with chlorine-based whitewater in the kraft pulp bleaching step, the fluorescence can be eliminated, and water saving accompanying reuse of papermaking whitewater can be provided.
【０００９】[0009]
【課題を解決するための手段】本発明者は、上記の問題
点を解決すべく鋭意研究を重ねた結果、本発明の蛍光染
料を含有する古紙または抄紙白水の蛍光消去法を発明す
るに至った。Means for Solving the Problems As a result of intensive studies to solve the above-mentioned problems, the present inventors have invented a fluorescence elimination method for waste paper or paper white water containing the fluorescent dye of the present invention. Was.
【００１０】本発明の蛍光染料を含有する古紙の蛍光消
去法は、クラフトパルプの塩素系漂白工程における少な
くとも１箇所以上にて、蛍光染料を含有する古紙からな
る離解、脱墨または漂白処理した古紙パルプをクラフト
パルプに対して５〜５０重量％混合して漂白し、蛍光消
去処理することを特徴とするとするものである。即ち、
クラフトパルプの漂白工程で使用される塩素系漂白剤に
よって蛍光染料に存在する共役２重結合、発色基などが
分解され蛍光を抑制する。The method of the present invention for fluorescence-erasing waste paper containing a fluorescent dye comprises the steps of disintegrating, deinking, or bleaching a waste paper containing a fluorescent dye at least at one or more locations in a chlorine-based bleaching step of kraft pulp. It is characterized in that pulp is mixed with kraft pulp in an amount of 5 to 50% by weight, bleached, and subjected to a fluorescence elimination treatment. That is,
The chlorine-based bleaching agent used in the bleaching process of kraft pulp decomposes conjugated double bonds, coloring groups, and the like, which are present in the fluorescent dye, and suppresses fluorescence.
【００１１】本発明における蛍光染料を含有する古紙の
蛍光強度が、０．５〜１０であり、且つ蛍光染料が、ス
チルベン基、アミノ基、スルフォン基、ジアゾ基のいず
れか１つ以上を有する紫外短波長２００〜４００ｎｍで
ある。The used paper containing the fluorescent dye of the present invention has a fluorescence intensity of 0.5 to 10 and the fluorescent dye has an ultraviolet light having at least one of a stilbene group, an amino group, a sulfone group and a diazo group. The short wavelength is 200 to 400 nm.
【００１２】本発明におけるクラフトパルプの塩素系漂
白工程が、塩素、塩素と二酸化塩素、二酸化塩素、次亜
塩素酸塩の段から選ばれる少なくとも１箇所以上であ
る。The chlorine-based bleaching step of the kraft pulp in the present invention is at least one or more sites selected from the stage of chlorine, chlorine and chlorine dioxide, chlorine dioxide, and hypochlorite.
【００１３】また、本発明の蛍光染料を含有する抄紙白
水の蛍光消去法は、クラフトパルプの塩素系漂白工程に
おける少なくとも１箇所以上から排出される塩素系白水
（Ｂ）中に、蛍光染料を含有する抄紙白水（Ａ）を重量
比（Ａ／Ｂ）で１／１〜１／１００混合し、蛍光消去処
理することを特徴とするものである。即ち、クラフトパ
ルプの塩素系白水中に残存する塩素系イオンによって蛍
光染料に存在する共役２重結合、発色基などが分解され
蛍光を抑制する。[0013] In the fluorescence elimination method of paper white water containing a fluorescent dye according to the present invention, the fluorescent dye is contained in the chlorine white water (B) discharged from at least one or more places in the chlorine bleaching step of kraft pulp. The paper white water (A) is mixed in a weight ratio (A / B) of 1/1 to 1/100, and the mixture is subjected to a fluorescence erasing process. That is, chlorinated ions remaining in the chlorinated white water of the kraft pulp decompose conjugated double bonds, coloring groups, and the like present in the fluorescent dye to suppress fluorescence.
【００１４】本発明における蛍光染料を含有する抄紙白
水の蛍光強度が、０．３〜８であり、且つ蛍光染料が、
スチルベン基、アミノ基、スルフォン基、ジアゾ基のい
ずれか１つ以上を有する紫外短波長２００〜４００ｎｍ
である。The fluorescence intensity of the papermaking white water containing the fluorescent dye of the present invention is 0.3 to 8, and the fluorescent dye is:
UV short wavelength 200 to 400 nm having at least one of stilbene group, amino group, sulfone group and diazo group
It is.
【００１５】本発明における塩素系白水が、塩素、塩素
と二酸化塩素、二酸化塩素、次亜塩素酸塩による段の少
なくとも１箇所以上から排出される白水であり、残塩素
量が１〜１０００ｐｐｍである。The chlorine-based white water used in the present invention is white water discharged from at least one of the stages of chlorine, chlorine and chlorine dioxide, chlorine dioxide, and hypochlorite, and has a residual chlorine content of 1 to 1000 ppm. .
【００１６】[0016]
【発明の実施の形態】本発明で再生処理される古紙とし
ては、一般的に印刷古紙やオフィス古紙中に存在する蛍
光染料で染色されたチラシ、カタログなどの印刷された
上質紙や微塗工紙などである。蛍光染料を含有する上質
紙は、元々白色度が高く、高品質な古紙である。従っ
て、脱墨と脱蛍光だけでもニーズにあった製品が得られ
る場合もある。BEST MODE FOR CARRYING OUT THE INVENTION As used paper to be recycled in the present invention, there are generally printed high-quality paper such as flyers and catalogs which are dyed with a fluorescent dye existing in used paper and office waste paper, and fine coated paper. Such as paper. Fine paper containing a fluorescent dye is originally a high-quality waste paper having high whiteness. Therefore, a product that meets the needs may be obtained only by deinking and defluorescence.
【００１７】上記蛍光染料を含有する古紙は、離解、脱
墨または漂白処理して古紙パルプ（以下、ＤＩＰと略
す）とし、これをクラフトパルプ（以下、ＫＰと略す）
の塩素系漂白工程中の任意の箇所に混合され、ＤＩＰお
よびＫＰと共に漂白することで蛍光が消去される。Waste paper containing the above fluorescent dye is subjected to defibration, deinking or bleaching treatment to make waste paper pulp (hereinafter abbreviated as DIP), which is kraft pulp (hereinafter abbreviated as KP).
Is mixed at an arbitrary point in the chlorine-based bleaching step, and the fluorescence is eliminated by bleaching with DIP and KP.
【００１８】ＫＰは、一般的に使用されている広葉樹パ
ルプ（以下、ＬＢＫＰと略す）、針葉樹パルプ（以下、
ＮＢＫＰと略す）などであり、樹種としては国産材によ
る広葉樹および針葉樹、外国材による広葉樹および針葉
樹、さらに植林材などを挙げることができる。KP is generally used hardwood pulp (hereinafter abbreviated as LBKP), softwood pulp (hereinafter abbreviated as LBKP).
NBKP). Examples of tree species include hardwood and conifer made of domestic timber, hardwood and conifer made of foreign timber, and forest planting.
【００１９】蛍光染料を含有するＤＩＰは、ＫＰに対し
て３〜５０重量％の混合量で漂白処理するものであり、
処理後のパルプ品質面を考慮した場合、好ましくは１０
〜３０重量％である。DIP containing a fluorescent dye is subjected to bleaching at a mixing amount of 3 to 50% by weight based on KP.
Considering the pulp quality after treatment, it is preferably 10
３０30% by weight.
【００２０】ここで、ＤＩＰが、ＫＰに対して３重量％
未満では、品質などの問題はないがポンプなどの設備的
に配合が難しい。一方、５０重量％を超えて多いと現行
操業条件を変更し、且つ晒薬品の添加率を過剰に必要と
なり、さらにパルプ品質も低下する。Here, DIP is 3% by weight based on KP.
If it is less than 50%, there is no problem with the quality, etc., but it is difficult to mix with equipment such as a pump. On the other hand, if the content exceeds 50% by weight, the current operating conditions are changed, the bleaching chemical addition rate is excessively required, and the pulp quality is further deteriorated.
【００２１】本発明における蛍光染料としては、スチル
ベン基、アミノ基、スルフォン基、ジアゾ基のいずれか
１つ以上を有するものであり、紫外短波長が２００〜４
００ｎｍの波長領域を有するものである。蛍光染料とし
ては、具体的には、ビス（トリアジニルアミノ）スチル
ベンジスルホン酸誘導体、クマリン誘導体、ピラゾニン
誘導体、ナフタルイミド誘導体、ビスベンゾオキサゾリ
ル誘導体、ビススチリルビフェニール誘導体などを挙げ
ることができる。なお、蛍光染料は、蛍光分光光度計お
よびＦＴ−ＩＲにより上記波長領域に限定するととも
に、過酸化水素を用いて蛍光消去できないものを対象と
している。The fluorescent dye used in the present invention has at least one of a stilbene group, an amino group, a sulfone group and a diazo group, and has an ultraviolet short wavelength of 200 to 4.
It has a wavelength range of 00 nm. Specific examples of the fluorescent dye include bis (triazinylamino) stilbene disulfonic acid derivative, coumarin derivative, pyrazonin derivative, naphthalimide derivative, bisbenzooxazolyl derivative, bisstyryl biphenyl derivative and the like. In addition, the fluorescent dye is limited to the above-mentioned wavelength region by a fluorescence spectrophotometer and FT-IR, and is intended to be a dye which cannot be fluorescently erased using hydrogen peroxide.
【００２２】本発明における蛍光染料を含有する古紙パ
ルプの蛍光強度は、０．５〜１０の範囲内にあるもので
ある。蛍光強度の測定に当たっては、日本電色工業社
製；スペクトルカラーメーター「ＰＦ−１０」を使用し
た。The fluorescent intensity of the waste paper pulp containing the fluorescent dye in the present invention is in the range of 0.5 to 10. In measuring the fluorescence intensity, a spectrum color meter “PF-10” manufactured by Nippon Denshoku Industries Co., Ltd. was used.
【００２３】ここで、蛍光強度が０．５未満でも消去効
果が見られるが、０．５未満のレベルであれば、そのま
まＤＩＰ系の再生処理工程で消去可能である。一方、蛍
光強度が１０を超えて大きいと通常のＫＰ塩素系漂白工
程では完全に蛍光消去しきれない。尚、品質を考慮せず
に過剰に塩素系薬品を添加すれば消去できる。Here, the erasing effect can be seen even when the fluorescence intensity is less than 0.5. However, when the fluorescence intensity is less than 0.5, the erasing can be performed as it is in the DIP-based reproduction processing step. On the other hand, if the fluorescence intensity is higher than 10, the fluorescence cannot be completely erased in the ordinary KP chlorine bleaching step. In addition, erasing can be performed by adding an excessive amount of a chlorine-based chemical without considering quality.
【００２４】蛍光染料を含有する古紙を離解、脱墨また
は漂白処理してＤＩＰは、ＫＰの塩素系漂白工程におけ
る少なくとも一箇所以上で脱蛍光処理するが、ＫＰにお
ける塩素系漂白工程としては、塩素（Ｃ）、塩素と二酸
化塩素（Ｄ）、二酸化塩素、次亜塩素酸塩（Ｈ）の段か
ら選ばれる少なくとも１箇所以上で行うものである。例
えば、Ｃ−Ｅ（アルカリ段）−Ｈ−Ｄ、Ｃ／Ｄ−Ｅ−Ｈ
−Ｄ、Ｄ−Ｅ−Ｈ−Ｄなどである。The waste paper containing the fluorescent dye is disintegrated, deinked or bleached, and the DIP is defluorinated at at least one place in the chlorine bleaching step of KP. (C), chlorine and chlorine dioxide (D), chlorine dioxide, hypochlorite (H) at least at one or more sites selected from the stage. For example, CE (alkali stage) -HD, C / DEH
-D and DEHD.
【００２５】本発明における蛍光染料を含有する抄紙白
水の蛍光消去法は、ＫＰの塩素系漂白工程における少な
くとも１箇所以上から排出される塩素系白水（Ｂ）に対
して、蛍光染料を含有する抄紙白水（Ａ）を混合して蛍
光を消去するものである。混合に当たっては、重量比
（Ａ／Ｂ）で１／１〜１／１００の範囲である。さらに
好ましくは、１／２〜１／８０の範囲である。In the present invention, the method for fluorescence elimination of paper white water containing a fluorescent dye is a method for producing paper containing a fluorescent dye with respect to chlorine white water (B) discharged from at least one or more places in the chlorine bleaching step of KP. It mixes white water (A) to eliminate fluorescence. In mixing, the weight ratio (A / B) is in the range of 1/1 to 1/100. More preferably, it is in the range of 1/2 to 1/80.
【００２６】蛍光染料を含有する抄紙白水とは、一般的
に蛍光染料（蛍光増白剤など）を使用している印刷原
紙、塗工原紙等の抄造時に発生する白水のことである。The paper white water containing a fluorescent dye is generally white water generated during the papermaking of a printing base paper, a coating base paper, etc. using a fluorescent dye (fluorescent brightener or the like).
【００２７】ここで、蛍光染料を含有する抄紙白水
（Ａ）が、ＫＰより排出される塩素系白水（Ｂ）に対し
て、１／１００未満では、効果が見られるが、抄紙白水
の使用量が少なくなる。一方、１／１を超えて多いと蛍
光消去の効果が小さい。Here, when the white water (A) containing the fluorescent dye is less than 1/100 of the chlorine white water (B) discharged from the KP, the effect is seen. Is reduced. On the other hand, if the ratio exceeds 1/1, the effect of the fluorescence erasing is small.
【００２８】蛍光染料が含有する抄紙白水の蛍光強度
は、０．３〜８．０の範囲内であるものである。蛍光染
料としては、スチルベン基、アミノ基、スルフォン基、
ジアゾ基のいずれか１つ以上を有するものであり、紫外
短波長が２００〜４００ｎｍの波長領域を有するもので
ある。The fluorescent intensity of the papermaking white water contained in the fluorescent dye is in the range of 0.3 to 8.0. As fluorescent dyes, stilbene groups, amino groups, sulfone groups,
It has at least one of diazo groups and has a wavelength range of 200 to 400 nm in ultraviolet short wavelength.
【００２９】ここで、蛍光強度が０．３未満でも消去効
果が見られるが、０．３未満のレベルであれば抄紙系の
凝集沈澱処理などで消去でき、そのまま抄紙白水として
使用しても問題ない。一方、蛍光強度が８を超えて大き
いとＫＰの塩素白水では蛍光を完全に消去しきれない。Here, the erasing effect can be seen even if the fluorescence intensity is less than 0.3, but if the fluorescence intensity is less than 0.3, it can be erased by coagulation sedimentation treatment of a papermaking system, etc. Absent. On the other hand, if the fluorescence intensity is higher than 8, the fluorescence cannot be completely eliminated by KP chlorine white water.
【００３０】ＫＰの塩素系漂白工程から排出されるＫＰ
白水は、塩素、塩素と二酸化塩素、二酸化塩素、次亜塩
素酸塩による段における少なくとも１箇所以上から排出
されるものであり、残塩素量としては１〜１０００ｐｐ
ｍである。さらに好ましくは１０〜５００ｐｐｍであ
る。ここで、１ｐｐｍ未満では、ほとんど蛍光を消去す
ることができず、１０００ｐｐｍを超えて多いＫＰ白水
はほとんど存在せず、且つこれ以上のレベルでは環境問
題となる。KP discharged from chlorine bleaching process of KP
White water is discharged from at least one or more places in the stage of chlorine, chlorine and chlorine dioxide, chlorine dioxide, and hypochlorite, and the residual chlorine amount is 1 to 1000 pp.
m. More preferably, it is 10 to 500 ppm. Here, if it is less than 1 ppm, almost no fluorescence can be eliminated, and more than 1000 ppm of KP white water hardly exists, and if it is higher than this level, it becomes an environmental problem.
【００３１】ＤＩＰの脱蛍光処理条件は、ＫＰ工程にお
ける漂白条件で十分消去でき、さらに漂白性の向上も図
れるため、条件の変更をする必要もない。The defluorescence treatment conditions of DIP can be sufficiently eliminated by the bleaching conditions in the KP step, and the bleaching properties can be improved, so that there is no need to change the conditions.
【００３２】また、抄紙白水の蛍光についても同様に変
更する必要がないが、混合比率と残塩素率に十分注意す
る必要がある。It is not necessary to change the fluorescence of papermaking white water in the same manner, but it is necessary to pay close attention to the mixing ratio and the residual chlorine ratio.
【００３３】ＤＩＰ再生処理については、公知の処理方
法でよいが、一般的な工程の一例として、例えば、離解
工程（パルパー）→粗選工程（粗選スクリーン、クリー
ナー、粗選ウォッシャー、粗選シックナー）→脱墨工程
（脱墨ニーダー、フローテーター）→精選工程（精選ス
クリーン、クリーナー、精選ウォッシャー、精選シック
ナー）→漂白工程（漂白ニーダー、漂白塔、漂白ウォッ
シャー）→抄紙工程（高濃度チェスト、抄紙機）などの
順で行う処理方法を挙げることができる。The DIP regeneration treatment may be performed by a known treatment method. Examples of general steps include, for example, a defibration step (pulper) → a rough selection step (a rough selection screen, a cleaner, a rough selection washer, a rough selection thickener). ) → deinking process (deinking kneader, floatator) → selective process (selective screen, cleaner, selective washer, selective thickener) → bleaching process (bleaching kneader, bleach tower, bleach washer) → papermaking process (high density chest, papermaking) ).
【００３４】[0034]
【実施例】以下、実施例を挙げて本発明を具体的に説明
するが、本発明は本実施例に限定されるものではない。
なお、実施例において、記載の部、％は全て重量部、重
量％によるものである。EXAMPLES Hereinafter, the present invention will be described specifically with reference to examples, but the present invention is not limited to these examples.
In the examples, all parts and percentages are by weight and percentage by weight.
【００３５】本発明の実施例または比較例に当たって、
下記の測定および評価方法に従って行った。白色度（ハ
ンター白色度法；ＪＩＳ−Ｐ８１２３）、色相および蛍
光強度（日本電色社製スペクトルカラーメーター「ＰＦ
−１０」）、密度（ＪＩＳ−Ｐ８１１８）、濾水度（カ
ナディアンフリーネステスター；ＪＩＳ−Ｐ８１２
１）、裂断長（ＪＩＳ−Ｐ８１１３）、内部結合強度
（インターナルボンドテスター）、不透明度（ＪＩＳ−
Ｐ８１３８）、平滑度（ＴＡＰＰＩ Ｔ−２３６）、比
引裂強度（エルメンドルフ引裂き試験器；ＪＩＳ−Ｐ８
１１６）を使用して測定した。In Examples or Comparative Examples of the present invention,
It carried out according to the following measurement and evaluation methods. Whiteness (Hunter whiteness method; JIS-P8123), hue and fluorescence intensity (Nippon Denshoku Spectral Color Meter "PF"
-10 "), density (JIS-P8118), freeness (Canadian freeness tester; JIS-P812)
1), breaking length (JIS-P8113), internal bond strength (internal bond tester), opacity (JIS-P8113)
P8138), smoothness (TAPPI T-236), specific tear strength (Elmendorf tear tester; JIS-P8)
116).
【００３６】印刷古紙、オフィス古紙は一般的なものを
使用し、蛍光染料を含有する古紙及びＫＰ白水は、ＦＴ
−ＩＲ（パーキンエルマージャパン社製）、スペクトル
カラーメーターと過酸化水素で脱色できないこと確認し
て使用した。For the used printing paper and office waste paper, general ones are used. The used paper containing fluorescent dye and KP Hakusui are FT
-IR (manufactured by Perkin-Elmer Japan), a spectrum color meter and a hydrogen peroxide were used after confirming that decolorization was impossible.
【００３７】＜蛍光染料を含有する古紙の蛍光消去＞ 実施例１ 蛍光染料を含有する色上古紙（蛍光強度４．１）を高濃
度パルパー（パルプ濃度約２０％）を用い、水酸化ナト
リウム（ＮａＯＨ）０．８％、脱墨剤（花王社製；ＤＩ
−１２００）０．０８％を添加し、室温にて３０分間離
解した。その後、洗浄脱水し、濃度約３０％に調整した
後、過酸化水素０．１％、ＮａＯＨ２．４％、脱墨剤
０．１８％を加えて分散混合し、温度６０℃で２時間熟
成した。次いでフローテーション処理し、洗浄脱水して
白色度８１．９％、蛍光強度３．９の古紙パルプ（ＤＩ
Ｐ）を得た。得られたＤＩＰに、二酸化塩素（ＣｌＯ
2）０．１％（対絶乾パルプ）を添加し、パルプ濃度１
５％、室温で６０分間攪拌し、洗浄脱水してパルプを得
た。<Fluorescence Erasing of Used Paper Containing Fluorescent Dye> Example 1 Colored used paper (fluorescent intensity 4.1) containing a fluorescent dye was treated with high-concentration pulper (pulp concentration: about 20%) using sodium hydroxide ( NaOH) 0.8%, deinking agent (manufactured by Kao Corporation; DI
-1200) 0.08%, and defibrated at room temperature for 30 minutes. Then, after washing and dehydrating to adjust the concentration to about 30%, 0.1% of hydrogen peroxide, 2.4% of NaOH and 0.18% of a deinking agent were added, dispersed and mixed, and aged at a temperature of 60 ° C. for 2 hours. . Then, the waste paper pulp (DI) having a whiteness of 81.9% and a fluorescence intensity of 3.9 was subjected to flotation treatment, washing and dehydration.
P) was obtained. Chlorine dioxide (ClO) was added to the obtained DIP.
2) Add 0.1% (vs. absolutely dry pulp) and make the pulp concentration 1
The mixture was stirred at 5% at room temperature for 60 minutes, washed and dehydrated to obtain a pulp.
【００３８】実施例２ 蛍光染料を含有する色上古紙（蛍光強度６．８）を実施
例１と同様の条件で離解し、洗浄脱水した後、さらに熟
成、フローテーション処理し、洗浄脱水して白色度８
２．３％、蛍光強度６．５のＤＩＰを得た。得られたＤ
ＩＰに、ＣｌＯ2０．１５％を添加し、パルプ濃度１５
％、室温で６０分間処理、洗浄脱水してパルプを得た。Example 2 Colored waste paper (fluorescence intensity: 6.8) containing a fluorescent dye was disintegrated under the same conditions as in Example 1, washed and dehydrated, further aged, floated, washed and dehydrated. Whiteness 8
DIP having 2.3% and a fluorescence intensity of 6.5 was obtained. D obtained
0.15% of ClO2 was added to the IP, and the pulp concentration was 15%.
%, Treated at room temperature for 60 minutes, washed and dewatered to obtain pulp.
【００３９】実施例３ 蛍光染料を含有する色上古紙（蛍光強度９．８）を実施
例１と同様の条件で離解し、洗浄脱水した後、さらに熟
成、フローテーション処理し、洗浄脱水して白色度８
２．７％、蛍光強度９．６のＤＩＰを得た。得られたＤ
ＩＰに、ＣｌＯ2０．２％を添加し、室温で６０分間処
理し、洗浄脱水してパルプを得た。Example 3 Colored waste paper (fluorescence intensity: 9.8) containing a fluorescent dye was disintegrated and washed and dehydrated under the same conditions as in Example 1, then further aged, floated, washed and dehydrated. Whiteness 8
2.7% and a DIP having a fluorescence intensity of 9.6 were obtained. D obtained
The IP was added with 0.2% of ClO2, treated at room temperature for 60 minutes, washed and dehydrated to obtain a pulp.
【００４０】実施例４ 実施例３の蛍光染料を含有する色上古紙（蛍光強度９．
８）を同様の条件で離解し、洗浄脱水、さらに熟成、フ
ローテーション処理し、洗浄脱水して白色度８２．７
％、蛍光強度９．６のＤＩＰを得た。得られたＤＩＰ
に、ＣｌＯ2０．２％を添加し、５０℃で６０分間処理
し、洗浄脱水してパルプを得た。Example 4 Used color paper containing the fluorescent dye of Example 3 (fluorescent intensity 9.
8) is disintegrated under the same conditions, washed and dehydrated, further ripened, flotated, washed and dehydrated, and has a whiteness of 82.7.
% And a DIP having a fluorescence intensity of 9.6. DIP obtained
Was added thereto and treated at 50 ° C. for 60 minutes, washed and dehydrated to obtain pulp.
【００４１】実施例５ 実施例３の蛍光染料を含有する色上古紙（蛍光強度９．
８）を同様の条件で離解し、洗浄脱水し、さらに熟成、
フローテーション処理し、洗浄脱水して白色度８２．７
％、蛍光強度９．６のＤＩＰを得た。得られたＤＩＰ
に、ＣｌＯ2０．２％を添加し、室温で１２０分間処理
し、洗浄脱水してパルプを得た。Example 5 Colored waste paper containing the fluorescent dye of Example 3 (fluorescence intensity 9.
8) Disintegrate under the same conditions, wash and dehydrate, further ripen,
Flotation treatment, washing dehydration and whiteness 82.7
% And a DIP having a fluorescence intensity of 9.6. DIP obtained
Was added, and treated at room temperature for 120 minutes, washed and dehydrated to obtain a pulp.
【００４２】実施例６ 実施例１の蛍光染料を含有する色上古紙（蛍光強度４．
１）を同条件で離解し、洗浄脱水した後、熟成、フロー
テーション処理し、洗浄脱水して白色度８１．９％、蛍
光強度３．９のＤＩＰを得た。次いで、クラフトパルプ
（ＫＰ）漂白工程：Ｏ（酸素漂白）−Ｃ（塩素）／Ｄ1
（二酸化塩素）−Ｅ（水酸化ナトリウム）−Ｈ（次亜塩
素酸ナトリウム）−Ｄ2におけるＣ／Ｄ1段にＤＩＰを３
０％配合して、多段漂白したパルプを得た。Example 6 Colored waste paper containing the fluorescent dye of Example 1 (fluorescent intensity 4.
1) was disintegrated under the same conditions, washed and dehydrated, then subjected to aging, flotation treatment, and washing and dehydrating to obtain a DIP having a whiteness of 81.9% and a fluorescence intensity of 3.9. Next, a kraft pulp (KP) bleaching step: O (oxygen bleaching) -C (chlorine) / D 1
(Chlorine dioxide) -E (sodium hydroxide) -H 3 the DIP to C / D 1 stage at (sodium hypochlorite) -D 2
By blending 0%, a multistage bleached pulp was obtained.
【００４３】＜漂白の条件＞ Ｃの添加率；１．５％、 Ｄ1の添加率；０．１５％でパルプ濃度３．５％、５５
℃、３０分間 Ｅの添加率；０．８％でパルプ濃度１２％、６５℃、９
０分間 Ｈの添加率；０．４％でパルプ濃度１２％、６５℃、９
０分間 Ｄ2の添加率；０．１％でパルプ濃度１２％、６５℃、
９０分間 なお、ＤＩＰを配合しないＯ−Ｃ／Ｄ1−Ｅ−Ｈ−Ｄ2に
て漂白したＫＰは、白色度８６．２％、蛍光強度０．０
である。The addition rate of <bleaching conditions>C; 1.5% addition rate of D 1; 3.5% pulp concentration at 0.15%, 55
C, 30 minutes E addition rate; Pulp concentration 12% at 0.8%, 65 ° C, 9
0 minute H addition rate; pulp concentration 12% at 0.4%, 65 ° C, 9
Addition rate of 0 minutes D 2; 12% pulp concentration at 0.1%, 65 ℃,
For 90 minutes, KP bleached with OC / D 1 -EHD 2 without DIP had a whiteness of 86.2% and a fluorescence intensity of 0.0.
It is.
【００４４】実施例７ 実施例６と同様の条件で、蛍光強度３．９のＤＩＰとＫ
ＰのＨ段に３０％配合して、Ｈ−Ｄ2の漂白したパルプ
を得た。Example 7 Under the same conditions as in Example 6, DIP and K having a fluorescence intensity of 3.9 were used.
By blending 30% with the H stage of P, a bleached pulp of HD- 2 was obtained.
【００４５】＜漂白の条件＞ Ｈの添加率；０．４％でパルプ濃度１２％、６５℃、９
０分間 Ｄ2の添加率；０．１％でパルプ濃度１２％、６５℃、
９０分間<Bleaching conditions> H addition rate: 0.4% at 12% pulp concentration, 65 ° C., 9
Addition rate of 0 minutes D 2; 12% pulp concentration at 0.1%, 65 ℃,
90 minutes
【００４６】実施例８ 実施例６と同様の条件で、蛍光強度３．９のＤＩＰとＫ
ＰのＤ2段に１０％配合して、Ｄ2の漂白したパルプを得
た。Example 8 Under the same conditions as in Example 6, DIP and K having a fluorescence intensity of 3.9 were used.
10% was added to the D 2 stage of P to obtain a bleached pulp of D 2 .
【００４７】＜漂白の条件＞ Ｄ2の添加率；０．１％でパルプ濃度１２％、６５℃、
９０分間The addition rate of <bleaching conditions> D 2; 12% pulp concentration at 0.1%, 65 ℃,
90 minutes
【００４８】実施例９ 実施例８と同様の条件で、蛍光強度３．９のＤＩＰとＫ
ＰのＤ2段に３０％配合して、Ｄ2の漂白したパルプを得
た。漂白条件は実施例８と同じ。Example 9 Under the same conditions as in Example 8, DIP and K having a fluorescence intensity of 3.9 were used.
By blending 30% with the D 2 stage of P, a bleached pulp of D 2 was obtained. The bleaching conditions are the same as in Example 8.
【００４９】実施例１０ 実施例８と同様の条件で、蛍光強度３．９のＤＩＰとＫ
ＰのＤ2段に５０％配合して、Ｄ2の漂白したパルプを得
た。漂白条件は実施例８と同じ。Example 10 Under the same conditions as in Example 8, DIP and K having a fluorescence intensity of 3.9 were used.
50% was blended with D 2 stage of P to obtain bleached pulp of D 2 . The bleaching conditions are the same as in Example 8.
【００５０】比較例１ 実施例１の蛍光染料を含有する色上古紙（蛍光強度４．
１）を同様の条件で離解、脱墨して白色度８１．９％、
蛍光強度３．９のＤＩＰを得た。得られたＤＩＰに、Ｈ
（ハイポ）の添加率を０．３％、パルプ濃度１２％、５
０℃、６０分間処理し、洗浄脱水して白色度８５．８
％、蛍光強度３．３のパルプを得た。Comparative Example 1 Colored waste paper containing the fluorescent dye of Example 1 (fluorescent intensity 4.
1) disaggregation and deinking under the same conditions to obtain a whiteness of 81.9%,
DIP having a fluorescence intensity of 3.9 was obtained. In the obtained DIP, H
(Hypo) addition rate 0.3%, pulp concentration 12%, 5
Treated at 0 ° C. for 60 minutes, washed and dehydrated, and obtained a whiteness of 85.8.
%, And a pulp having a fluorescence intensity of 3.3 was obtained.
【００５１】比較例２ 実施例１の蛍光染料を含有する色上古紙（蛍光強度４．
１）を同様の条件で離解、脱墨して白色度８１．９％、
蛍光強度３．９のＤＩＰを得た。得られたＤＩＰに、過
酸化水素（Ｈ2Ｏ2）１．０％とＮａＯＨ０．５％を添加
し、パルプ濃度１２％、８０℃、１２０分間処理し、洗
浄脱水してパルプを得た。Comparative Example 2 Colored waste paper containing the fluorescent dye of Example 1 (fluorescent intensity 4.
1) disaggregation and deinking under the same conditions to obtain a whiteness of 81.9%,
DIP having a fluorescence intensity of 3.9 was obtained. To the obtained DIP, 1.0% of hydrogen peroxide (H2O2) and 0.5% of NaOH were added, the pulp concentration was 12%, the mixture was treated at 80 ° C. for 120 minutes, and washed and dewatered to obtain pulp.
【００５２】比較例３ 実施例１の蛍光染料を含有する色上古紙（蛍光強度４．
１）を同様の条件で離解、脱墨して白色度８１．９％、
蛍光強度３．９のＤＩＰを得た。得られたＤＩＰに、オ
ゾン（Ｏ3）０．５％を添加し、パルプ濃度３５％、室
温、１０分間処理し、洗浄脱水してパルプを得た。Comparative Example 3 Colored waste paper containing the fluorescent dye of Example 1 (fluorescent intensity 4.
1) disaggregation and deinking under the same conditions to obtain a whiteness of 81.9%,
DIP having a fluorescence intensity of 3.9 was obtained. To the obtained DIP, 0.5% of ozone (O3) was added, treated with pulp concentration of 35% at room temperature for 10 minutes, washed and dehydrated to obtain pulp.
【００５３】比較例４ 実施例１の蛍光染料を含有する色上古紙（蛍光強度４．
１）を同様の条件で離解、脱墨して白色度８１．９％、
蛍光強度３．９のＤＩＰを得た。得られたＤＩＰに、二
酸化チオ尿素（ＦＡＳ）０．５％を添加し、パルプ濃度
１２％、５０℃、６０分間処理し、洗浄脱水してパルプ
を得た。Comparative Example 4 Used color paper containing the fluorescent dye of Example 1 (fluorescent intensity 4.
1) disaggregation and deinking under the same conditions to obtain a whiteness of 81.9%,
DIP having a fluorescence intensity of 3.9 was obtained. To the obtained DIP, 0.5% of thiourea dioxide (FAS) was added, treated with pulp concentration of 12% at 50 ° C. for 60 minutes, washed and dehydrated to obtain pulp.
【００５４】比較例５ 実施例１の蛍光染料を含有する色上古紙（蛍光強度４．
１）を同様の条件で離解、脱墨して白色度８１．９％、
蛍光強度３．９のＤＩＰを得た。得られたＤＩＰに、ジ
クロロイソシアヌル酸ナトルム（日本曹達社製；ジクロ
トップ６０ＦＧ）０．５％を添加し、パルプ濃度１２
％、５０℃、６０分間処理、洗浄脱水してパルプを得
た。Comparative Example 5 Used color paper containing the fluorescent dye of Example 1 (fluorescent intensity of 4.
1) disaggregation and deinking under the same conditions to obtain a whiteness of 81.9%,
DIP having a fluorescence intensity of 3.9 was obtained. 0.5% of sodium dichloroisocyanurate (manufactured by Nippon Soda Co., Ltd .; Diclotop 60FG) was added to the obtained DIP, and the pulp concentration was 12%.
%, Treated at 50 ° C. for 60 minutes, washed and dewatered to obtain pulp.
【００５５】比較例６ 実施例１の蛍光染料を含有する色上古紙（蛍光強度４．
１）を同様の条件で離解、脱墨して白色度８１．９％、
蛍光強度３．９のＤＩＰを得た。得られたＤＩＰに、カ
チオン性ポリアミン系化合物（一方社社製；ＯＰ６０
０）０．５％を添加し、パルプ濃度１２％、５０℃、６
０分間処理し、洗浄脱水してパルプを得た。Comparative Example 6 Used color paper containing the fluorescent dye of Example 1 (fluorescent intensity 4.
1) disaggregation and deinking under the same conditions to obtain a whiteness of 81.9%,
DIP having a fluorescence intensity of 3.9 was obtained. The obtained DIP was added to a cationic polyamine compound (manufactured by Ichisha; OP60).
0) Add 0.5%, pulp concentration 12%, 50 ° C, 6
The mixture was treated for 0 minutes, washed and dehydrated to obtain pulp.
【００５６】上記実施例１〜１０と比較例１〜６の蛍光
染料を含有する古紙に対する蛍光消去の評価結果につい
て、下記表１に示す。Table 1 below shows the results of evaluating the fluorescence erasure of the used papers containing the fluorescent dyes of Examples 1 to 10 and Comparative Examples 1 to 6.
【００５７】[0057]
【表１】 [Table 1]
【００５８】上記表１から明らかなように、一般的な漂
白剤であるオゾン、過酸化水素、ハイポ、ＦＡＳでは、
完全に消去できない。また、市販のジクロイソシアヌル
酸Ｎａも難しいだけでなく、ＡＯＸとクロロホルムの発
生につながる。カチオン性ポリアミン系化合物は効果あ
るものの褪色（黄化）が認められる。As is clear from Table 1 above, in general bleaching agents such as ozone, hydrogen peroxide, hypo and FAS,
Cannot be completely erased. Also, commercially available sodium dicroisocyanurate is not only difficult, but also leads to the generation of AOX and chloroform. Although the cationic polyamine compound is effective, fading (yellowing) is recognized.
【００５９】実施例８、９、１０とＫＰをＰＦＩミルに
て叩解し、濾水度４００ｃｃとして坪量６０ｇ／ｍ2の
シートを手抄き、パルプ物性を測定した結果を表２に示
す。蛍光染料を含有する色上古紙の配合率が５０％で
は、パルプ物性において若干強度の低下が認められるた
めクラフトパルプに対して好ましくは５０％未満がよ
い。Examples 8, 9, 10 and KP were beaten with a PFI mill, the freeness was set to 400 cc, and a sheet having a basis weight of 60 g / m 2 was hand-measured. When the blending ratio of colored waste paper containing a fluorescent dye is 50%, the strength of the pulp is slightly reduced in physical properties.
【００６０】[0060]
【表２】 [Table 2]
【００６１】＜蛍光染料を含有する白水の蛍光消去＞ 実施例１１ 蛍光染料を含有するＰＰＣ白水（蛍光強度３．４）に、
ＣｌＯ2を１００ｐｐｍ添加し、室温にて３０分間、混
合攪拌した。<Fluorescence Elimination of Fluorescent Dye-Containing White Water> Example 11 PPC white water (fluorescent intensity 3.4) containing a fluorescent dye
100 ppm of ClO2 was added and mixed and stirred at room temperature for 30 minutes.
【００６２】実施例１２ 蛍光染料を含有するコート紙白水（蛍光強度７．８）
に、ＣｌＯ2を１０００ｐｐｍ添加し、室温にて３０分
間、混合攪拌した。Example 12 Coated Paper White Water Containing Fluorescent Dye (Fluorescent Intensity 7.8)
Was added and mixed and stirred at room temperature for 30 minutes.
【００６３】実施例１３ 実施例１１のＰＰＣ白水に、Ｃｌ2を１００ｐｐｍ添加
し、室温にて３０分間、混合攪拌した。Example 13 To the PPC white water of Example 11, 100 ppm of Cl 2 was added, and the mixture was mixed and stirred at room temperature for 30 minutes.
【００６４】実施例１４ 実施例１１のＰＰＣ白水に、ハイポを３００ｐｐｍ添加
し、室温にて３０分間、混合攪拌した。Example 14 To the PPC white water of Example 11, 300 ppm of hypo was added and mixed and stirred at room temperature for 30 minutes.
【００６５】実施例１５ 実施例１１のＰＰＣ白水とクラフトパルプの漂白工程か
ら排出されたＣ白水（残塩素１０ｐｐｍ）の混合比を
１：１００にして、５０℃、３０分間、混合攪拌した。Example 15 The mixing ratio of PPC white water of Example 11 and C white water (residual chlorine 10 ppm) discharged from the kraft pulp bleaching step was 1: 100, and the mixture was stirred at 50 ° C. for 30 minutes.
【００６６】実施例１６ 実施例１１のＰＰＣ白水とクラフトパルプの漂白工程か
ら排出されたＨ白水（残塩素５０ｐｐｍ）の混合比を
１：５０にして、５０℃、３０分間、混合攪拌した。Example 16 The mixing ratio of PPC white water of Example 11 and H white water (residual chlorine 50 ppm) discharged from the bleaching step of kraft pulp was 1:50, and the mixture was stirred at 50 ° C. for 30 minutes.
【００６７】実施例１７ 実施例１１のＰＰＣ白水とクラフトパルプの漂白工程か
ら排出されたＤ白水（残塩素１００ｐｐｍ）の混合比を
１：１０にして、５０℃、３０分間、混合攪拌した。Example 17 The mixing ratio of PPC white water of Example 11 and D white water (residual chlorine 100 ppm) discharged from the bleaching step of kraft pulp was 1:10, and the mixture was stirred at 50 ° C. for 30 minutes.
【００６８】実施例１８ 実施例１１のＰＰＣ白水をＫＰ漂白工程８Ｏ−Ｃ／Ｄ1
−Ｅ−Ｈ−Ｄ2）のＣ／Ｄ1段にて洗浄希釈水の５０％を
置換して、多段漂白したパルプを得た。なお、各漂白の
条件は、実施例６と同一である。Example 18 KP bleaching step 80-C / D 1 of the PPC white water of Example 11
-E-H-D 2 ) was replaced with 50% of the washing dilution water in one stage of C / D to obtain a multistage bleached pulp. The bleaching conditions were the same as in Example 6.
【００６９】実施例１９ 実施例１１のＰＰＣ白水をＫＰ漂白工程（Ｏ−Ｃ／Ｄ1
−Ｅ−Ｈ−Ｄ2９のＨ段にて洗浄希釈水の７０％を置換
して、多段漂白したパルプを得た。なお、各漂白の条件
は、実施例６と同一である。Example 19 The PPC white water of Example 11 was subjected to the KP bleaching step (OC / D 1).
By replacing 70% of the cleaning dilution water with -E-H-D 2 9 of H stage, to obtain a multi-stage bleached pulp. The bleaching conditions were the same as in Example 6.
【００７０】実施例２０ 実施例１１のＰＰＣ白水をＫＰ漂白工程（Ｏ−Ｃ／Ｄ1
−Ｅ−Ｈ−Ｄ2）のＤ2段にて洗浄希釈水の１００％を置
換して、多段漂白したパルプを得た。なお、各漂白の条
件は、実施例６と同一である。Example 20 The PPC white water of Example 11 was subjected to a KP bleaching step (OC / D 1
-E-H-D 2 ) was replaced with 100% of the washing dilution water in D 2 stage to obtain a multi-stage bleached pulp. The bleaching conditions were the same as in Example 6.
【００７１】比較例７ 実施例１１のＰＰＣ白水をＫＰ漂白工程（Ｏ−Ｃ／Ｄ1
−Ｅ−Ｈ−Ｄ2）の漂白後に、洗浄希釈水の５０％を置
換した。Comparative Example 7 The PPC white water of Example 11 was subjected to the KP bleaching step (OC / D 1
After the bleaching of -EHD- 2 ), 50% of the washing dilution water was replaced.
【００７２】比較例８ 実施例１１のＰＰＣ白水をＫＰ漂白工程（Ｏ−Ｃ／Ｄ1
−Ｅ−Ｈ−Ｄ2）の漂白後に、洗浄希釈水の１０％を置
換した。Comparative Example 8 The PPC white water of Example 11 was subjected to a KP bleaching step (OC / D 1
After the bleaching of -EHD- 2 ), 10% of the washing dilution water was replaced.
【００７３】上記実施例１１〜２０および比較例７〜８
で得た各白水および濾過した残査、パルプの蛍光強度、
白色度、色相について、測定した結果を下記表３に示
す。Examples 11 to 20 and Comparative Examples 7 to 8
Each white water obtained in and the residue filtered, the fluorescence intensity of the pulp,
Table 3 below shows the measurement results of the whiteness and the hue.
【００７４】[0074]
【表３】 [Table 3]
【００７５】各塩素系白水と混合し、処理することでほ
ぼ完全に残査と白水の蛍光を消去することができ、さら
にパルプへの影響もない。By mixing and treating with each chlorine-based white water, the residue and the white water fluorescence can be almost completely eliminated, and there is no influence on the pulp.
【００７６】[0076]
【発明の効果】本発明により、蛍光染料を含有する古紙
パルプを蛍光消去することで、バージンパルプと変わら
ない高品質のものを得ることができ、古紙の利用が拡大
する。さらに蛍光染料を含有する抄紙白水の蛍光消去す
ることで、抄紙白水の再利用に伴う節水を提供すること
ができる。According to the present invention, high-quality virgin pulp can be obtained by fluorescence-erasing waste paper pulp containing a fluorescent dye, and the use of waste paper is expanded. Further, by performing the fluorescence elimination of the papermaking white water containing a fluorescent dye, it is possible to provide water saving accompanying the reuse of the papermaking whitewater.
Claims (6)
る少なくとも１箇所以上にて、蛍光染料を含有する古紙
からなる離解、脱墨または漂白処理した古紙パルプをク
ラフトパルプに対して３〜５０重量％混合して漂白し、
蛍光消去処理することを特徴とする蛍光染料を含有する
古紙の蛍光消去法。1. A disintegrating, deinking or bleaching waste paper pulp made of waste paper containing a fluorescent dye is mixed in at least one place in a chlorine bleaching process of kraft pulp with 3 to 50% by weight based on the kraft pulp. And bleach,
A fluorescence erasing method for waste paper containing a fluorescent dye, characterized by performing a fluorescence erasing process.
０．５〜１０であり、且つ蛍光染料がスチルベン基、ア
ミノ基、スルフォン基、ジアゾ基のいずれか１つ以上を
有する紫外短波長２００〜４００ｎｍであることを特徴
とする請求項１記載の蛍光染料を含有する古紙の蛍光消
去法。2. The fluorescence intensity of waste paper containing a fluorescent dye,
The fluorescent dye according to claim 1, wherein the fluorescent dye has an ultraviolet short wavelength of 200 to 400 nm having at least one of a stilbene group, an amino group, a sulfone group, and a diazo group. Fluorescence elimination method for waste paper containing dye.
塩素、二酸化塩素、次亜塩素酸塩の段から選ばれる少な
くとも１箇所以上であることを特徴とする請求項１記載
の蛍光染料を含有する古紙の蛍光消去法。3. The fluorescent dye according to claim 1, wherein the chlorine-based bleaching step is at least one site selected from the group consisting of chlorine, chlorine and chlorine dioxide, chlorine dioxide, and hypochlorite. Fluorescence elimination method for waste paper contained.
る少なくとも１箇所以上から排出される塩素系白水
（Ｂ）中に、蛍光染料を含有する抄紙白水（Ａ）を重量
比（Ａ／Ｂ）で１／１〜１／１００混合し、蛍光消去処
理することを特徴とする蛍光染料を含有する抄紙白水の
蛍光消去法。4. A chlorine-based white water (B) discharged from at least one or more places in a chlorine-based bleaching step of kraft pulp is a papermaking white water (A) containing a fluorescent dye in a weight ratio (A / B) of 1%. / 1 to 1/100, and performing a fluorescence erasing treatment, wherein the papermaking white water contains a fluorescent dye.
が、０．３〜８であり、且つ蛍光染料がスチルベン基、
アミノ基、スルフォン基、ジアゾ基のいずれか１つ以上
を有する紫外短波長２００〜４００ｎｍであることを特
徴とする請求項４記載の蛍光染料を含有する抄紙白水の
蛍光消去法。5. The papermaking white water containing a fluorescent dye has a fluorescence intensity of 0.3 to 8, and the fluorescent dye is a stilbene group,
5. The method of claim 4, wherein the ultraviolet light has a short wavelength of 200 to 400 nm having at least one of an amino group, a sulfone group and a diazo group.
素、二酸化塩素、次亜塩素酸塩による段の少なくとも１
箇所以上から排出される白水であり、残塩素量が１〜１
０００ｐｐｍであることを特徴とする請求項４記載の蛍
光染料を含有する抄紙白水の蛍光消去法。6. The chlorinated white water is at least one of a stage composed of chlorine, chlorine and chlorine dioxide, chlorine dioxide, and hypochlorite.
White water discharged from more than one point, residual chlorine amount is 1 to 1
5. The method according to claim 4, wherein the whitening water contains a fluorescent dye.
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|---|---|---|---|
| JP7006398A JP3556463B2 (en) | 1998-03-19 | 1998-03-19 | Fluorescence elimination method of waste paper pulp containing fluorescent dye |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7006398A JP3556463B2 (en) | 1998-03-19 | 1998-03-19 | Fluorescence elimination method of waste paper pulp containing fluorescent dye |
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| Publication Number | Publication Date |
|---|---|
| JPH11269788A true JPH11269788A (en) | 1999-10-05 |
| JP3556463B2 JP3556463B2 (en) | 2004-08-18 |
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|---|---|---|---|---|
| JP2006336165A (en) * | 2005-06-03 | 2006-12-14 | Daio Paper Corp | Method for producing white liner, and white liner |
| US7377993B2 (en) * | 2004-03-03 | 2008-05-27 | Tanya Smith Richardson | Methods for reducing fluorescence in pulp and paper |
| CN102230291A (en) * | 2011-06-16 | 2011-11-02 | 黑龙江省造纸研究所有限公司 | Method for removing fluorescent substance in waste paper pulp |
| WO2013098219A1 (en) * | 2011-12-28 | 2013-07-04 | Akzo Nobel Chemicals International B.V. | Process for reducing fluorescence in pulp |
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1998
- 1998-03-19 JP JP7006398A patent/JP3556463B2/en not_active Expired - Fee Related
Cited By (10)
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|---|---|---|---|---|
| US7377993B2 (en) * | 2004-03-03 | 2008-05-27 | Tanya Smith Richardson | Methods for reducing fluorescence in pulp and paper |
| JP2006336165A (en) * | 2005-06-03 | 2006-12-14 | Daio Paper Corp | Method for producing white liner, and white liner |
| CN102230291A (en) * | 2011-06-16 | 2011-11-02 | 黑龙江省造纸研究所有限公司 | Method for removing fluorescent substance in waste paper pulp |
| WO2013098219A1 (en) * | 2011-12-28 | 2013-07-04 | Akzo Nobel Chemicals International B.V. | Process for reducing fluorescence in pulp |
| CN104066884A (en) * | 2011-12-28 | 2014-09-24 | 纳尔科公司 | Process for reducing fluorescence in pulp |
| CN104066884B (en) * | 2011-12-28 | 2016-06-29 | 纳尔科公司 | The method of the fluorescence in reduction paper pulp |
| AU2012361026B2 (en) * | 2011-12-28 | 2016-09-15 | Akzo Nobel Chemicals International B.V. | Process for reducing fluorescence in pulp |
| TWI643998B (en) * | 2011-12-28 | 2018-12-11 | 安科智諾貝爾化學國際公司 | Process for reducing fluorescence in pulp |
| KR20200099200A (en) * | 2018-01-12 | 2020-08-21 | 타이턴 바이오사이언스 엘엘씨 | Method for recycling cotton and polyester fibers from waste fabrics |
| US12006403B2 (en) | 2018-01-12 | 2024-06-11 | Circ, LLC | Methods for recycling cotton and polyester fibers from waste textiles |
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