JPH03294589A - Treatment of unclassified waste information-recording paper - Google Patents
Treatment of unclassified waste information-recording paperInfo
- Publication number
- JPH03294589A JPH03294589A JP2092302A JP9230290A JPH03294589A JP H03294589 A JPH03294589 A JP H03294589A JP 2092302 A JP2092302 A JP 2092302A JP 9230290 A JP9230290 A JP 9230290A JP H03294589 A JPH03294589 A JP H03294589A
- Authority
- JP
- Japan
- Prior art keywords
- paper
- bleaching
- pulp
- recording paper
- concentration
- 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
- 238000011282 treatment Methods 0.000 title claims description 9
- 239000002699 waste material Substances 0.000 title abstract description 13
- 238000004061 bleaching Methods 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 22
- 238000005188 flotation Methods 0.000 claims abstract description 11
- 239000007844 bleaching agent Substances 0.000 claims abstract description 9
- 238000005406 washing Methods 0.000 claims abstract description 6
- 238000004898 kneading Methods 0.000 claims abstract description 5
- GRWZHXKQBITJKP-UHFFFAOYSA-L dithionite(2-) Chemical compound [O-]S(=O)S([O-])=O GRWZHXKQBITJKP-UHFFFAOYSA-L 0.000 claims abstract description 4
- 239000010893 paper waste Substances 0.000 claims description 14
- 230000001590 oxidative effect Effects 0.000 claims description 3
- 238000009896 oxidative bleaching Methods 0.000 claims 1
- 229910052799 carbon Inorganic materials 0.000 abstract description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 7
- 239000000463 material Substances 0.000 abstract description 3
- 230000003647 oxidation Effects 0.000 abstract 3
- 238000007254 oxidation reaction Methods 0.000 abstract 3
- 238000002803 maceration Methods 0.000 abstract 1
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 21
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 16
- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 description 14
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 8
- 239000000460 chlorine Substances 0.000 description 8
- 239000004155 Chlorine dioxide Substances 0.000 description 7
- 229910052801 chlorine Inorganic materials 0.000 description 7
- 235000019398 chlorine dioxide Nutrition 0.000 description 7
- JVBXVOWTABLYPX-UHFFFAOYSA-L sodium dithionite Chemical compound [Na+].[Na+].[O-]S(=O)S([O-])=O JVBXVOWTABLYPX-UHFFFAOYSA-L 0.000 description 7
- 235000011121 sodium hydroxide Nutrition 0.000 description 7
- 239000002994 raw material Substances 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 239000005708 Sodium hypochlorite Substances 0.000 description 5
- WQYVRQLZKVEZGA-UHFFFAOYSA-N hypochlorite Inorganic materials Cl[O-] WQYVRQLZKVEZGA-UHFFFAOYSA-N 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 5
- 239000003513 alkali Substances 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 239000002761 deinking Substances 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000004115 Sodium Silicate Substances 0.000 description 3
- 238000004040 coloring Methods 0.000 description 3
- 239000000975 dye Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 3
- 229910052911 sodium silicate Inorganic materials 0.000 description 3
- BPRJTLAULHNDLP-UHFFFAOYSA-N Chloropanaxydiol Chemical compound CCCCCCCC1OC1CC#CC#CC(O)C(O)CCl BPRJTLAULHNDLP-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 238000004076 pulp bleaching Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000009898 sodium hypochlorite bleaching Methods 0.000 description 2
- 235000019832 sodium triphosphate Nutrition 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- ZKQDCIXGCQPQNV-UHFFFAOYSA-N Calcium hypochlorite Chemical compound [Ca+2].Cl[O-].Cl[O-] ZKQDCIXGCQPQNV-UHFFFAOYSA-N 0.000 description 1
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- 238000010793 Steam injection (oil industry) Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910001902 chlorine oxide Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000009897 hydrogen peroxide bleaching Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000010812 mixed waste Substances 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000005070 ripening Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
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
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は情報記録紙の古紙を夫々の記録紙に選別するこ
となく抄紙用原料として再利用するための処理法に関す
るものであり、特に上級紙用原料としても使用可能なパ
ルプを回収する方法に係るものである。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a processing method for reusing waste information recording paper as a raw material for papermaking without sorting it into each recording paper, and in particular This invention relates to a method for recovering pulp that can also be used as a raw material for paper.
近年、資源・環境保護および都市ゴミ対策の観点から、
古紙利用を促進すべきであるとの気運が高まって来てい
る。ここで特に問題とされているのは、オフィス等から
廃棄される情報記録紙の古紙である。この種の古紙は、
電子写真複写機やし−ザ一方式プリンターからのトナー
印刷物、ノーカーボン複写紙、ファクシミリ用感熱紙お
よび裏カーボン複写紙等で構成されている。In recent years, from the perspective of resource and environmental protection and urban waste countermeasures,
There is a growing momentum to promote the use of recycled paper. A particular problem here is waste information recording paper discarded from offices and the like. This kind of waste paper is
It consists of toner prints from electrophotographic copiers and one-way printers, carbonless copy paper, facsimile thermal paper, carbon-backed copy paper, etc.
これら情報記録古紙のうち、ノーカーボン紙。Among these information recording waste papers, carbonless paper is used.
感熱紙および裏カーボン紙は、一般の古紙に混入すると
回収後のパルプが着色したり、着色斑点が出現したりす
るので、いわゆる禁忌品とされている。また、トナー印
刷古紙は、ｌＷ解、浮遊選別（フローテーション）およ
び洗浄から成る一般的な脱墨方法では脱インキが極めて
不充分である。Thermal paper and carbon-backed paper are considered contraindicated because if they are mixed with general waste paper, the recovered pulp will be colored or colored spots will appear. Further, toner-printed waste paper is extremely insufficiently deinked by a general deinking method consisting of IW solution, flotation, and washing.
このように情報記録紙古紙は全て難脱墨古紙であると言
える。In this way, it can be said that all information recording paper is waste paper that is difficult to remove ink.
以上の情報記録紙古紙の成る種のものに就いては、その
単独処理方法が公知となっている。For the above-mentioned types of waste information recording paper, individual processing methods are known.
トナー印刷古紙に就いては、例えば、紙パルプ技術タイ
ムス、 ３１（８）、２５（１９８８）に記載されてい
る通り、離解古紙を高濃度でニーディングする工程を付
は加えることにより、トナーインふの効率的な分離・除
去が可能である。Regarding toner-printed waste paper, for example, as described in Paper and Pulp Technology Times, 31(8), 25 (1988), by adding a process of kneading disintegrated waste paper at a high concentration, toner printing can be performed. Efficient separation and removal of dust is possible.
ノーカーボン古紙の処理方法に関しては、特公昭６４−
３９９１ 、特開昭６０−２３１８８９．特開昭５５−
９８９９０ 。Regarding the treatment method of carbonless waste paper,
3991, JP-A-60-231889. Japanese Unexamined Patent Publication No. 55-
98990.
特開昭５５−６５８０ 、特開昭５４−１３８６０５お
よびＴａｐｐｉ、６２（７）、２７（１９７９）等に開
示されている。これらの共通点は、離解、浮遊選別およ
び漂白の各工程を含むことである。漂白工程で用いられ
る漂白剤の種類は、次亜塩素酸ソーダ、亜二チオン酸ソ
ーダ、塩素または過酸化水素の各単独あるいは組合わせ
処理が有効であると述べられている。It is disclosed in JP-A-55-6580, JP-A-54-138605, and Tappi, 62(7), 27 (1979). What these have in common is that they include disintegration, flotation, and bleaching steps. Regarding the types of bleaching agents used in the bleaching process, it is said that sodium hypochlorite, sodium dithionite, chlorine, or hydrogen peroxide, each singly or in combination, are effective.
感熱紙および裏カーボン紙の古紙に就いては効果的な処
理技術は未だ確立されていないのが現状である。At present, no effective processing technology has been established for waste paper such as thermal paper and carbon-backed paper.
〔発明が解決しようとする課題〕
以上のように、特定の情報記録紙古紙を個々に処理する
方法は成る程度知られている。しかしながらオフィス等
から発生する情報記録紙の古紙は種々のものの混合品で
あり、これを選別することは困璽であり、多大の労力を
要する。従って未選別の状態で回収処理する方法が求め
られるが、未だその再利用は全く試みられていないのが
実情である。[Problems to be Solved by the Invention] As described above, methods for individually processing specific waste information recording papers are known to a certain extent. However, waste information recording paper generated from offices and the like is a mixture of various materials, and sorting it is difficult and requires a great deal of effort. Therefore, there is a need for a method for collecting and processing the unsorted materials, but the reality is that no attempt has been made to reuse them yet.
本発明者等は未選別の情報記録紙古紙の処理方法に就い
て鋭意検討した結果、成る種の裏カーボン紙（青インキ
）が特に問題であることを見出した。即ちこれが少量で
も混入していると、パルプ全体が青色に着色してしまい
、通常の脱墨方法では除くことが困難であった。裏カー
ボン紙単独ではその脱インキは難解後の浮遊選別で比較
的容易に分離できるが、電子写真複写用紙やノーカーボ
ン紙の古紙と混ざると全体が染色されたようになり、そ
の脱インキが非常に困難になることを見出した。The inventors of the present invention have conducted intensive studies on methods for disposing of unsorted waste information recording paper, and have found that back carbon paper (blue ink) is particularly problematic. That is, if even a small amount of this is mixed in, the entire pulp will be colored blue, and it is difficult to remove it using normal deinking methods. When using carbon-backed paper alone, the ink can be removed relatively easily by flotation sorting after difficult separation, but when mixed with electrophotographic copying paper or used carbonless paper, the entire surface becomes dyed, making it extremely difficult to remove the ink. I found that it becomes difficult.
そこで、本発明者等はこの色を脱色し得る方法に就いて
研究した結果、酸化漂白剤を使用することにより脱色が
可能であることを見出し、本発明を完成させるに至った
ものである。すなわち、本発明の目的はオフィス等から
発生する情報記録紙古紙を選別することなくそのまま処
理し、上級紙用原料としても充分使用可能な高白色度で
且つ夾雑物の少ないパルプを回収する方法を提供するも
のである。Therefore, the present inventors researched a method for bleaching this color, and as a result found that bleaching was possible by using an oxidizing bleach, and completed the present invention. That is, the purpose of the present invention is to provide a method for processing waste information recording paper generated from offices, etc., as it is without sorting it, and recovering pulp with high whiteness and low impurities that can be used as raw material for high-grade paper. This is what we provide.
本発明は離解，混練、浮遊選別、洗浄および漂白の各工
程を含む処理方法に於いて特に漂白方法にポイントが存
在しているのである。The present invention is a treatment method including the steps of disintegration, kneading, flotation sorting, washing and bleaching, and particularly the bleaching method is the key point.
離解工程では、古紙原料の離解に通常用いられる高濃度
または低濃度の各種パルパーが使用可能である。添加薬
品として、苛性ソーダ、ケイ酸ソーダ、過酸化水素、界
面活性剤等を用いるのが通例であるが、古紙原料によっ
ては省略可能な薬品もある。離解後、パルプから粗大な
異物を除去するため、クリーナーおよびスクリーン処理
を行なうのが一般的である。In the disintegration step, various high-concentration or low-concentration pulpers commonly used for disintegrating waste paper raw materials can be used. It is customary to use caustic soda, sodium silicate, hydrogen peroxide, surfactants, etc. as additive chemicals, but some chemicals may be omitted depending on the used paper raw material. After disintegration, cleaner and screen treatments are generally performed to remove coarse foreign matter from the pulp.
次ぎにパルプは濃度２０〜３５％程度に濃縮され、混線
工程に移送される。この工程はトナー印刷古紙に由来す
るトナーインキを、後段の浮遊選別工程で分離可能な大
きさにまで微粒子化することを目的とするものである。Next, the pulp is concentrated to a concentration of about 20 to 35% and transferred to a cross-mixing process. The purpose of this process is to micronize toner ink derived from toner-printed waste paper to a size that can be separated in the subsequent flotation sorting process.
このための装置としては、ニーダ−、ディスパーザ−或
いはミキサー等の固体混合機が使用される。なお、必要
に応じ固定混合機の直前で薬品添加および／または蒸気
注入を行なうことができる。As an apparatus for this purpose, a solid mixer such as a kneader, disperser or mixer is used. Note that, if necessary, chemical addition and/or steam injection can be performed immediately before the fixed mixer.
混線工程後のパルプは通常、アルカリによる繊維の膨潤
を促進させるため、高濃度のままタワー等に滞留させる
熟成処理が行なわれる。また、熟成後に混線工程を設け
てもよい。After the cross-mixing process, the pulp is usually subjected to an aging process in which it is retained in a tower or the like at a high concentration in order to promote the swelling of the fibers due to alkali. Further, a crossing step may be provided after ripening.
以上の処理後、パルプは濃度１％程度に希釈されて浮遊
選別工程に送られ、インキが分離される。After the above treatment, the pulp is diluted to a concentration of about 1% and sent to a flotation process to separate the ink.
浮遊選別装置には一般の古紙脱墨処理で使用される各種
フローテータ−が使用可能である。なお、浮遊選別後に
混練工程を設けることもできる。Various types of floatators used in general waste paper deinking processing can be used as the flotation sorting device. Note that a kneading step can also be provided after the flotation sorting.
浮遊選別後、パルプの洗浄が行なわれる。この工程では
残存する微量のトナーインキが除去され、染料、顔料等
の着色物質も成る程度は除かれる。After flotation, the pulp is washed. In this step, trace amounts of remaining toner ink are removed, and coloring substances such as dyes and pigments are also removed.
洗浄用の装置としては、各種のエキストラクターデツカ
−、シックナーおよびプレス型の濃縮機が使用可能であ
る。洗浄後のパルプには、裏カーボン紙、ノーカーボン
紙および感熱紙等に由来する着色物質が残存し、特に成
る種の裏カーボン紙（青インキ）が混入した場合はパル
プは青色を呈する。As cleaning equipment, various extractor deckers, thickeners, and press-type concentrators can be used. Coloring substances originating from back carbon paper, carbonless paper, thermal paper, etc. remain in the pulp after washing, and especially when some types of back carbon paper (blue ink) are mixed, the pulp takes on a blue color.
そこで、前記着色物質を脱色するため漂白処理が実施さ
れる。ここで用いられる漂白剤として効果の見出された
ものは酸化漂白剤であり、特に、過酸化水素、酸素９次
亜塩素酸塩、塩素および二酸化塩素が効果的であった。Therefore, a bleaching treatment is performed to decolorize the colored substance. Oxidizing bleaches were found to be effective as bleaching agents, and hydrogen peroxide, oxygen 9-hypochlorite, chlorine, and chlorine dioxide were particularly effective.
これら酸化剤による漂白の条件としては１通常のパルプ
漂白で採用されている条件が適用できる。なお１次亜塩
素酸塩は次亜塩素酸ソーダまたは次亜塩素酸カルシウム
を用いるのが通例である。As conditions for bleaching with these oxidizing agents, conditions employed in ordinary pulp bleaching can be applied. Note that sodium hypochlorite or calcium hypochlorite is usually used as the primary hypochlorite.
これらの漂白により裏カーボン紙の青インキに由来する
着色は除去される。ただし、漂白後のパルプにはノーカ
ーボン紙や感熱紙等に含まれる染料が若干残る場合があ
る。このようなパルプに就いては次段の漂白として亜二
チオン酸塩漂白を実施すると好適である。亜二チオン酸
塩としては通常、亜二チオン酸ソーダが用いられる。漂
白条件は一般的なパルプ漂白で採用されている条件が適
用可能である。This bleaching removes the coloring of the back carbon paper that originates from the blue ink. However, some dyes contained in carbonless paper, thermal paper, etc. may remain in the pulp after bleaching. For such pulps, dithionite bleaching is preferably carried out as the next bleaching step. As the dithionite salt, sodium dithionite is usually used. As the bleaching conditions, the conditions employed in general pulp bleaching can be applied.
また、本発明においては酸素（Ｏ）、塩素（Ｃ）。Further, in the present invention, oxygen (O) and chlorine (C).
アルカリ（Ｅ）９次亜塩素酸塩（Ｈ）、二酸化塩素（Ｄ
）、過酸化水素等を組み合わせ、一般の化学パルプ同様
の多段漂白を行なってもよい１例えば。Alkali (E) 9 Hypochlorite (H), Chlorine dioxide (D
), hydrogen peroxide, etc. may be combined to perform multi-stage bleaching similar to general chemical pulp.
０ＣＥＨＤ、ＣＥＨＤ、ＣＥＨＥＤ等が適当である。こ
のような多段漂白により前記青インキおよび染料の両者
を除くことが可能である。0CEHD, CEHD, CEHED, etc. are suitable. Such multi-step bleaching makes it possible to remove both the blue ink and the dye.
以下、本発明を実施例によって説明する。 Hereinafter, the present invention will be explained by examples.
未選別情報記録紙古紙として以下の混合物を用いた。The following mixture was used as unsorted information recording paper waste paper.
（ａ）電子写真複写紙２０４部（風乾紙として、以下同
様）
ゼロックス５９９０による印刷物、トナー付着量０．５
６重量％
（ｂ）ノーカーボン複写紙１７６部
上用紙、中用紙および下用紙の各１枚組、黒色９発色面
積率２０％
（ｃ）感熱記録紙３５部
ファクシミリ用、黒色９発色面積率２０％（ｄ）裏カー
ボン複写紙２０部
宅配便用伝票、青色、未使用
以上の混合古紙に、苛性ソーダを１．０％（対絶乾紙、
以下同様）、ケイ酸ソーダ（３号）を２．０％、過酸化
水素を０．５％、日華化学社製脱墨剤商品名リポトール
Ｌｌ（−２００を０．３％それぞれ添加し、熊谷理機工
業社製高濃度パルプ離解機（５Ｌ容）を用い、原料濃度
１５％、温度５０℃で２４分間離解した。(a) 204 copies of electrophotographic copy paper (as air-dried paper, the same applies hereinafter) Printed matter by Xerox 5990, toner adhesion amount 0.5
6% by weight (b) 176 copies of carbonless copy paper, 1 sheet each of top paper, middle paper, and bottom paper, black 9 color development area ratio 20% (c) 35 copies of thermal recording paper for facsimile, black 9 color development area ratio 20 % (d) 20 copies of back carbon copy paper Courier slip, blue, mixed waste paper of unused or better quality with 1.0% caustic soda (absolutely dry paper,
The same applies below), 2.0% of sodium silicate (No. 3), 0.5% of hydrogen peroxide, and 0.3% of Lipotol Ll (-200, a deinking agent manufactured by NICCA Chemical Co., Ltd.), Using a high-concentration pulp disintegrator (5 L volume) manufactured by Kumagai Riki Kogyo Co., Ltd., the pulp was disintegrated for 24 minutes at a raw material concentration of 15% and a temperature of 50°C.
離解後のパルプを濃度３％に希釈した後、濃度２５％ま
で脱水した。このパルプを山本百馬製作所製テスト用ニ
ーダ−（２軸型、１．５ＫＶ）により回転数１４Ｏｒｐ
ｍで１回処理した。処理後のパルプを濃度１５％に希釈
し、５５℃で１２０分間熟成した。次ぎに濃度１％に希
釈し、極東振興社製テスト用フローテータ−（ＳＬ容）
を用いて１０分間浮遊選別を行なった。得られたパルプ
を濃度２０％までに脱水して洗浄を行なった。The pulp after disintegration was diluted to a concentration of 3%, and then dehydrated to a concentration of 25%. This pulp was processed using a test kneader (2-shaft type, 1.5 KV) made by Yamamoto Hyakuma Seisakusho at a rotational speed of 14 Orp.
It was treated once with m. The treated pulp was diluted to a concentration of 15% and aged at 55°C for 120 minutes. Next, dilute it to a concentration of 1% and use a test floatator (SL volume) manufactured by Kyokuto Shinko Co., Ltd.
Floating sorting was carried out for 10 minutes using a . The obtained pulp was dehydrated to a concentration of 20% and washed.
実施例１ 洗浄後のパルプを以下の条件で過酸化水素漂白した。Example 1 The washed pulp was bleached with hydrogen peroxide under the following conditions.
過酸化水素添加量２％、苛性ソーダ添加量０．６％、ケ
イ酸ソーダ添加量３％、パルプ濃度１０％、７０℃、１
２０分
実施例２
洗浄後のパルプを、攪拌機付き横型オートクレーブ（１
８Ｌ容）を用い以下の条件で酸素漂白した。Hydrogen peroxide addition amount 2%, caustic soda addition amount 0.6%, sodium silicate addition amount 3%, pulp concentration 10%, 70°C, 1
20 minutes Example 2 The washed pulp was placed in a horizontal autoclave equipped with a stirrer (1
(8L volume) was used for oxygen bleaching under the following conditions.
仕込み量５００ｇ０Ｄ 、酸素添加量１１％、苛性ソー
ダ添加量１．５％、パルプ濃度１４％、１０３℃、６０
分
実施例３
洗浄後のパルプを以下の条件で次亜塩素酸ソーダ漂白し
た。Charge amount 500g0D, oxygen addition amount 11%, caustic soda addition amount 1.5%, pulp concentration 14%, 103℃, 60
Example 3 The washed pulp was bleached with sodium hypochlorite under the following conditions.
次亜塩素酸ソーダ添加量２％（有効塩素として）、苛性
ソーダ添加量０．５８％、パルプ濃度ｌＯ％、５０℃、
１２０分
実施例４
洗浄後のパルプを以下の条件で塩素漂白した。Addition amount of sodium hypochlorite 2% (as available chlorine), addition amount of caustic soda 0.58%, pulp concentration 1O%, 50℃,
120 minutes Example 4 The washed pulp was chlorine bleached under the following conditions.
塩素添加量２．１％、パルプ濃度２．５％、５４℃。Chlorine addition amount: 2.1%, pulp concentration: 2.5%, 54°C.
６０分 実施例５ 洗浄後のパルプを以下の条件で二酸化塩素漂白した。60 minutes Example 5 The washed pulp was bleached with chlorine dioxide under the following conditions.
二酸化塩素添加量２％（有効塩素として）。Added amount of chlorine dioxide: 2% (as available chlorine).
パルプ濃度１０％、６８℃、２４０分
実施例６
実施例１で得られた過酸化水素漂白パルプを１回洗浄し
た後、以下の条件で亜二チオン酸ソーダ漂白した。Pulp concentration: 10%, 68° C., 240 minutes Example 6 The hydrogen peroxide bleached pulp obtained in Example 1 was washed once and then bleached with sodium dithionite under the following conditions.
亜二チオン酸ソーダ添加量２％、トリポリリン酸ソーダ
添加量０．５％、初期ＰＨ６，５，パルプ濃度５％、７
０℃、 ６０分
実施例７
実施例４で得られた塩素漂白パルプを１回洗浄した後、
以下の条件でアルカリ処理、次亜塩素酸ソーダ漂白およ
び二酸化塩素漂白した。各漂白段の間で洗浄を１回行な
った。Sodium dithionite addition amount 2%, sodium tripolyphosphate addition amount 0.5%, initial pH 6.5, pulp concentration 5%, 7
0°C, 60 minutes Example 7 After washing the chlorine bleached pulp obtained in Example 4 once,
Alkali treatment, sodium hypochlorite bleaching and chlorine dioxide bleaching were carried out under the following conditions. One wash was performed between each bleach stage.
アルカリ処理：苛性ソーダ添加量１．２％、パルプ濃度
１０％、４４℃、６０分
次亜塩素酸ソーダ漂白：次亜塩素酸ソーダ添加量０．６
％、苛性ソーダ添加量０．１７％、パルプ濃度１０％、
４６℃、６０分
二酸化塩素漂白二二酸化塩素添加量０．８４％。Alkali treatment: Caustic soda addition amount 1.2%, pulp concentration 10%, 44°C, 60 minutes Sodium hypochlorite bleaching: Sodium hypochlorite addition amount 0.6
%, caustic soda addition amount 0.17%, pulp concentration 10%,
Chlorine dioxide bleaching at 46°C for 60 minutes Added amount of chlorine dioxide: 0.84%.
パルプ濃度１０％、６８℃、２４０分
比較例
洗浄後のパルプを以下の条件で亜二チオン酸ソーダ漂白
した。Pulp concentration: 10%, 68° C., 240 minutes Comparative Example The washed pulp was bleached with sodium dithionite under the following conditions.
亜二チオン酸ソーダ添加量２％、トリポリリン酸ソーダ
添加量０．５％、初期ｐＨ６，５，パルプ濃度５％、７
０℃、６０分
以上の各漂白後パルプを硫酸バンドでｐＨ６，５に調節
し、ＪＩＳ法により手抄紙を調製した。手抄紙の色相を
分光測色計（ミノルタカメラ社製ＣＭ−１０００型）に
より、白色度をハンター反射率計（東洋精機製作新製）
によりそれぞれ測定した。Sodium dithionite addition amount 2%, sodium tripolyphosphate addition amount 0.5%, initial pH 6.5, pulp concentration 5%, 7
After each pulp was bleached at 0° C. for 60 minutes or more, the pH was adjusted to 6.5 using sulfuric acid band, and handmade paper was prepared according to the JIS method. The hue of the handmade paper was measured using a spectrophotometer (Model CM-1000 manufactured by Minolta Camera Co., Ltd.), and the whiteness was measured using a Hunter reflectance meter (newly manufactured by Toyo Seiki Co., Ltd.).
Each was measured by
これらの測定結果は次表の通りである。The results of these measurements are shown in the table below.
以下余白 では青色は完全に消滅した。Margin below The blue color has completely disappeared.
過酸化水素漂白後のパルプは僅かに赤味を帯びていたが
引続き亜二チオン酸ソーダ漂白を行なうことにより赤味
は完全に消失し、白色度も増加した。また、ＣＥＨＤの
４段漂白により、青味が無く、且つ高白色度のパルプが
得られた。The pulp after hydrogen peroxide bleaching was slightly reddish, but by subsequent bleaching with sodium dithionite, the reddish color completely disappeared and the whiteness increased. Further, by four-stage bleaching using CEHD, a pulp with no bluish tinge and high whiteness was obtained.
本発明により未選別情報記録紙古紙からパルプを回収す
る場合の問題点であだ裏カーボン紙に由来する青色を除
去し、且つ高白色度のパルプを得ることができた。According to the present invention, it was possible to remove the blue color originating from the underside carbon paper, which is a problem when recovering pulp from unsorted waste information recording paper, and to obtain pulp with high whiteness.
Claims (1)
漂白工程より成る処理工程において、漂白工程で酸化漂
白剤を用いることを特徴とする未選別情報記録紙古紙の
処理法。 ２ 酸化漂白剤に引続き、亜二チオン酸塩で漂白を行な
う請求項１記載の未選別情報記録紙古紙の処理法。[Scope of Claims] 1. A method for treating unsorted information recording paper waste paper, which comprises using an oxidizing bleach in the bleaching step, in a treatment step consisting of a disintegrating step, a kneading step, a flotation step, a washing step, and a bleaching step. . 2. The method for treating unsorted information recording waste paper according to claim 1, wherein bleaching is performed with a dithionite salt following the oxidizing bleaching agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2092302A JPH03294589A (en) | 1990-04-09 | 1990-04-09 | Treatment of unclassified waste information-recording paper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2092302A JPH03294589A (en) | 1990-04-09 | 1990-04-09 | Treatment of unclassified waste information-recording paper |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03294589A true JPH03294589A (en) | 1991-12-25 |
Family
ID=14050617
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2092302A Pending JPH03294589A (en) | 1990-04-09 | 1990-04-09 | Treatment of unclassified waste information-recording paper |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03294589A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4861706A (en) * | 1971-11-10 | 1973-08-29 | ||
| JPS54138605A (en) * | 1978-04-14 | 1979-10-27 | Voith Gmbh J M | Retreating method of paper |
| JPS5598990A (en) * | 1979-01-19 | 1980-07-28 | Voith Gmbh J M | Regeneration of waste paper |
| JPS5620692A (en) * | 1979-07-30 | 1981-02-26 | Honshu Paper Co Ltd | Treatment of sticky impurities in used paper pulp |
| JPS643991A (en) * | 1987-06-25 | 1989-01-09 | Matsushita Electric Works Ltd | Memory light regulation device |
| JPS6440692A (en) * | 1987-07-31 | 1989-02-10 | Oji Paper Co | Bleaching of old paper pulp by waste gas desulfurizing product |
| JPH01168985A (en) * | 1987-12-22 | 1989-07-04 | Oji Paper Co Ltd | Bleaching of lignocellulose substance |
-
1990
- 1990-04-09 JP JP2092302A patent/JPH03294589A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4861706A (en) * | 1971-11-10 | 1973-08-29 | ||
| JPS54138605A (en) * | 1978-04-14 | 1979-10-27 | Voith Gmbh J M | Retreating method of paper |
| JPS5598990A (en) * | 1979-01-19 | 1980-07-28 | Voith Gmbh J M | Regeneration of waste paper |
| JPS5620692A (en) * | 1979-07-30 | 1981-02-26 | Honshu Paper Co Ltd | Treatment of sticky impurities in used paper pulp |
| JPS643991A (en) * | 1987-06-25 | 1989-01-09 | Matsushita Electric Works Ltd | Memory light regulation device |
| JPS6440692A (en) * | 1987-07-31 | 1989-02-10 | Oji Paper Co | Bleaching of old paper pulp by waste gas desulfurizing product |
| JPH01168985A (en) * | 1987-12-22 | 1989-07-04 | Oji Paper Co Ltd | Bleaching of lignocellulose substance |
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