JP2012007263A - Recycled pulp manufacturing method using printed used paper as raw material - Google Patents

Recycled pulp manufacturing method using printed used paper as raw material Download PDF

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JP2012007263A
JP2012007263A JP2010143640A JP2010143640A JP2012007263A JP 2012007263 A JP2012007263 A JP 2012007263A JP 2010143640 A JP2010143640 A JP 2010143640A JP 2010143640 A JP2010143640 A JP 2010143640A JP 2012007263 A JP2012007263 A JP 2012007263A
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waste paper
paper
raw material
printed
newspaper
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JP5778897B2 (en
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Yoshinori Nakamoto
義範 中本
Masato Nomura
正人 野村
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Tech Corp Co Ltd
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    • 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
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    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract

PROBLEM TO BE SOLVED: To obtain a recycled pulp manufacturing method using as raw material old newspaper or used printed paper, both having a high collection rate, by adding special surfactant or electrolyzed water during an deinking step in a process of manufacturing recycled pulp with raw material of newspaper (used paper) disposed and collected from households or offices.SOLUTION: In a manufacturing process of obtaining recycled pulp by using as raw material printed used paper such as old newspaper, the printed used paper such as old newspaper is cut into small pieces; alkaline electrolytic water obtained by electrolyzing water that has been added with a minute amount of refined salt is added to those small pieces of used paper such as old newspaper, then rapidly agitated to render the old newspaper fibrous; the fibrous old newspaper is put into an agitation container, added with an appropriate quantity of liquid surfactant, then gently agitated while ink released into liquid surface is removed. In this step, the liquid surfactant is straight chain sodium alkylbenzene sulfonate.

Description

この発明は、印刷された古紙を原料とした古紙パルプの製造方法に関する。   The present invention relates to a method for producing waste paper pulp using printed waste paper as a raw material.

従来、新聞は、社会の出来事をニュースとして伝えることが出来る重要な印刷物であり、日本の新聞発行部数は平成１９年度で約５０００万部／日であり、新聞用紙としての使用量は３７０万トン／年で、一世帯あたり、約７０Ｋｇ／年を消費している。   Traditionally, newspapers are important printed materials that can convey social events as news. The number of newspapers issued in Japan was approximately 50 million copies / day in 2007, and the amount used as newspaper paper is 3.7 million tons. Per year, about 70 kg / year is consumed per household.

近年、資源環境を踏まえた環境に優しい紙を目指し、各製紙会社では新聞古紙のリサイクルと軽量化についての技術開発が行われている。また、古紙回収により集められた新聞紙は、古紙パルプとなり新聞用紙約６０〜８０％が配合されている。   In recent years, with the aim of environmentally friendly paper based on the resource environment, each paper manufacturer has been developing technology for recycling and reducing the weight of used newspaper. Moreover, the newsprint collected by the used paper recovery becomes wastepaper pulp, and about 60-80% of newsprint is blended.

一方、新聞紙の軽量化も進み、現在では４３ｇ／ｍ2 となっている。古紙パルプには、印刷インキを取り除かない黒い低品質の古紙パルプで、板紙や段ボールなどの原料として、また、印刷インキを取り除いた脱墨パルプ（海外では脱インキパルプ＝Ｄｅｉｎｋｅｄ ｐｕｌｐ：ＤＩＰ）と呼ばれ、印刷用紙やトイレットペーパーなど白さを要求される紙の原料となっている。 On the other hand, newspapers are becoming lighter and now it is 43 g / m 2 . Waste paper pulp is a black low-quality waste paper pulp that does not remove printing ink, and is called deinked pulp (deinked pulp: DIP in overseas) as a raw material for paperboard and corrugated board, etc. Therefore, it has become a raw material for paper that requires whiteness, such as printing paper and toilet paper.

また、依然としてインキ油を含有する再生された新聞用紙繊維から、浴室用・顔面用ティッシュ、ナプキンおよびペーパータオル等の原料となっている。例えば、特許文献１のように。   In addition, recycled newspaper paper containing ink oil is still used as a raw material for bathroom / facial tissue, napkins and paper towels. For example, as in Patent Document 1.

特表平１０−５０６１５５号公報Japanese National Patent Publication No. 10-506155

このように、リサイクルにより原木資源が節約されると同時に、廃棄物収集・処理の負担軽減、製造に関わる電力消費を抑えることができることなどから、省エネルギー化にも役立ち、また、紙は同じ用途でリサイクルされる方が結果として好ましい。   In this way, recycling saves raw wood resources, while reducing the burden of waste collection and processing and reducing power consumption related to manufacturing. Recycling is preferred as a result.

そこで、この発明の課題は、家庭や事業所から廃棄・回収される新聞紙（古紙）、印刷された紙等を原料とした古紙パルプの製造工程において、脱インキ（脱墨）工程に、特別な電解水や界面活性剤を使用することにより、回収率の優れた白色の古紙が得られる，古新聞紙等の印刷された古紙を原料とした古紙パルプの製造方法を得ることにある。   Therefore, the problem of the present invention is that the deinking (deinking) process is special in the manufacturing process of used paper pulp made from newspaper (used paper), printed paper, etc., which is discarded / collected from homes or offices. By using electrolyzed water or a surfactant, a white waste paper with an excellent recovery rate can be obtained, and a method for producing waste paper pulp using waste paper printed as old newspaper paper or the like as a raw material is obtained.

この発明による課題を解決するための手段としては、古新聞紙や印刷された古紙を原料とした古紙パルプの製造工程において、微量の精製塩を加えた水を電気分解することにより得られるアルカリ性電解水を使用し、また、脱インキ（脱墨）工程に、液体の界面活性剤を添加して古新聞紙等の印刷された古紙を原料とした古紙パルプを得るものである。   Means for solving the problems of the present invention include alkaline electrolyzed water obtained by electrolyzing water to which a small amount of purified salt is added in the process of producing used paper pulp from old newspaper or printed used paper. In addition, a liquid surfactant is added to the deinking (deinking) step to obtain used paper pulp made from used used printed paper such as used newspaper.

この発明によると、小片化した古新聞紙や印刷された古紙を攪拌・離解するために、塩を用いた電気分解で得られたアルカリ性電解水を用いて処理するため、発生したナトリウムは水酸化ナトリウムに変換されて使用され、残りの塩素は漂白剤としての効果を発現している。
そもそも、古紙の残着色、木材を原料としていることから、パルプ化による繊維の褐色の要因となっているリグニンあるいは変質したリグニンが存在することが大きく起因されているが、上述のような、塩を用いた電気分解で得られたアルカリ性電解水を用いて処理するため、繊維状に解されたパルプの強度の低下を防ぐと共に、強度が維持される等の効果を有する。 According to this invention, in order to stir and break apart old newspapers and printed old papers, the generated sodium is treated with alkaline electrolyzed water obtained by electrolysis using salt. The remaining chlorine is used as a bleaching agent.
In the first place, the residual color of used paper and the use of wood as a raw material are largely attributed to the presence of lignin or denatured lignin that is the cause of browning of fibers due to pulping. Since the treatment is performed using the alkaline electrolyzed water obtained by electrolysis using, the strength of the pulp that has been broken into fibers is prevented from decreasing and the strength is maintained.

また、電解水の中でもアルカリ性電解水と種々の界面活性剤を検討したが、前述のように、特に、液体の界面活性剤（直鎖アルキルベンゼンスルホン酸ナトリウム）を共存させて処理することにより、新聞紙や他の印刷された紙に関わる古紙や印刷された紙の表面からの脱インク（脱墨）化が効率よく進み、目的とした白色の古紙が得られる等極めて有益なる効果を奏するものである。   Further, among electrolyzed water, alkaline electrolyzed water and various surfactants were examined. As described above, newspaper paper was particularly treated by coexisting with a liquid surfactant (sodium linear alkylbenzene sulfonate). Deinking (deinking) from the surface of used paper and other printed paper and the surface of the printed paper efficiently progresses, and the intended white used paper can be obtained. .

この発明の一実施例を示す説明図である。It is explanatory drawing which shows one Example of this invention. この発明の一実施例を示す工程図である。It is process drawing which shows one Example of this invention. この発明と他との比較試験を示す図である。It is a figure which shows the comparative test with this invention and others.

以下、この発明の好適な実施の形態について述べると、古新聞紙や印刷された古紙を原料とした古紙パルプの製造工程において、新聞紙等の古紙を小片化し、これらの小片化した古紙に、微量の精製塩を加えた水を電気分解することにより得られたアルカリ性電解水を加えて攪拌・離解する工程と、これら離解溶液を脱墨する工程と、前記攪拌・離解工程に使用する液体が、液体の界面活性剤と共存して使用することを特徴とする古新聞紙や印刷された古紙を原料とした古紙パルプの製造方法である。   Hereinafter, a preferred embodiment of the present invention will be described. In the waste paper pulp manufacturing process using old newspaper or printed waste paper as a raw material, waste paper such as newsprint is fragmented, and a small amount of waste paper is separated into these waste paper. The step of adding alkaline electrolyzed water obtained by electrolyzing water to which purified salt has been added and stirring / disaggregating, the step of deinking these disaggregating solutions, and the liquid used in the stirring / disaggregating step are liquid It is a method for producing waste paper pulp made from used newspaper and printed waste paper, characterized by being used in combination with other surfactants.

この発明の一実施例を実験に従って詳細に説明すると、古新聞紙をシュレッダー等により裁断して小片化する工程と、小片化された古新聞紙（１）をミキサー（２）に約２０ｇ〔新聞紙４面（縦５４．５×８１．２ｃｍ）に相当分〕を入れ、これにアルカリ性電解水（３）を１リットルを加え、高速攪拌して古新聞紙を繊維状にする工程と、この繊維状になった離解溶液を５リットルの攪拌槽（４）に移した後、液体の界面活性剤４ミリリットルを加えた後、緩やかに攪拌する工程と、溶液表面に遊離されるインクを、ガーゼで試作（縦・横４０ｃｍ）したラガー（紐）を羽根型攪拌棒（５）に取り付けて、ゆっくり低速（６０〜７０回転／分）で回転させて浮遊してくるインクを除去する工程と、その際にラガーの汚れの様子を観察しながら、５回程度繰り返してラガーの取り替え洗浄する工程と、次に、脱インク化（脱墨）され、離解した繊維状の古紙パルプ（６）を得る工程と、これを脱水（ろ過）する工程と、ついで、集積した古紙パルプの水洗（５リットル×３回）を行う工程と、その後、乾燥し脱インク（脱墨）された古紙パルプを得る工程からなり、その結果、古紙１２．２ｇ（回収率６０．１％）を得た。   An embodiment of the present invention will be described in detail according to an experiment. A process of cutting old newspaper into pieces by shredding or the like, and a piece of old newspaper (1) into about 20 g [four newspapers] (Corresponding to a length of 54.5 × 81.2 cm) is added, 1 liter of alkaline electrolyzed water (3) is added thereto, and the mixture is stirred at a high speed to make old newspaper into a fiber, and this fiber is formed. The disaggregated solution was transferred to a 5 liter stirring tank (4), 4 ml of a liquid surfactant was added, and then gently stirred, and the ink released on the solution surface was prototyped with gauze (vertical A step of removing the floating ink by attaching a lager (string) of 40 cm in width to the blade type stirring rod (5) and rotating it slowly at a low speed (60 to 70 rotations / minute), and then lager While observing the state of dirt A process of replacing and washing the lager repeatedly about 5 times, a process of obtaining deinked (deinked) and disaggregated fibrous waste paper pulp (6), and a process of dehydrating (filtering) this Then, the collected waste paper pulp is washed with water (5 liters x 3 times), and then dried and deinked (deinked) to obtain waste paper pulp. As a result, 12.2 g (recovered paper) 60.1%).

尚、前記記載のアルカリ性電解水に替わり、酸性電解水を用いる以外、全く同じ規模で操作を行ったが、この酸性電解水で処理した古紙パルプは、リグニンを効率よく除去することは出来ず、漂白効果に乏しく、しかも、酸の影響によりパルプの強度を弱めるなどの悪影響を及ぼし、全体的に淡く黒ずんだものであり、期待したほど白色化した古紙パルプは得られなかった。   In addition, instead of the alkaline electrolyzed water described above, except that acidic electrolyzed water was used, the operation was performed on exactly the same scale, but the waste paper pulp treated with this acidic electrolyzed water cannot efficiently remove lignin, The waste paper was poor in bleaching, and had an adverse effect such as weakening the strength of the pulp due to the influence of acid. As a whole, the paper pulp was slightly darkened and white paper as white as expected was not obtained.

さらに、〔００１４〕と〔００１５〕に記載した電解水（アルカリ性水及び酸性水）の替わりに水道水を用いて、得た古紙パルプでは、白色度をあげるためには、使用する界面活性剤を２倍量（８ミリリットル）に増やす必要があり、同時に使用した界面活性剤除去のための水洗に多量の水を使用しなければならず、また、水洗回数が残存する酸の影響により増すごとにパルプ繊維の流出も増加し、古紙パルプとしての回収率（２０〜４０％）は低下した。   Furthermore, in order to increase the whiteness of the used paper pulp obtained by using tap water instead of the electrolyzed water (alkaline water and acidic water) described in [0014] and [0015], a surfactant to be used is used. It is necessary to increase the amount to 2 times (8 milliliters), and a large amount of water must be used for water washing to remove the surfactant used at the same time. The outflow of pulp fibers also increased, and the recovery rate (20-40%) as waste paper pulp decreased.

このように、この発明は、電解水の中でもアルカリ性電解水と種々の界面活性剤を検討したが、特に液体の界面活性剤（直鎖型アルキルベンゼンスルホン酸ナトリウム）を共存させて処理することにより、新聞紙や印刷された古紙に関わる古紙表面から脱インク（脱墨）化が効率よく進み、目的とした白色のパルプ繊維が得られた。   As described above, the present invention examined alkaline electrolyzed water and various surfactants among electrolyzed water, and in particular by treating in the presence of a liquid surfactant (sodium alkylbenzene sulfonate), Deinking (deinking) progressed efficiently from the used paper surface related to newspaper and printed used paper, and the desired white pulp fiber was obtained.

白色度向上には脱インク（脱墨）され、離解されたパルプ繊維の中に付着しているインクを水洗の回数を増やすことにより対応できるが、古紙の回収率低下の要因にもなった。   Increasing the whiteness can be dealt with by increasing the number of times the ink that has been deinked (deinked) and adhered to the disaggregated pulp fibers is washed with water, but it also caused a decrease in the recovery rate of used paper.

一方、普通水（水道水）を利用した古紙パルプでと白色度を上げるためには、使用する界面活性剤の添加量（０．００２５％）を増やす必要があり、同時に使用した界面活性剤除去のための水洗に多量の水が必要となった。また、水洗回数が残存する酸の影響により増すごとにパルプ繊維の流出も増加し、古紙パルプとしての回収率（２０〜４０％）は低下した。   On the other hand, it is necessary to increase the amount of surfactant used (0.0025%) in order to increase the whiteness of recycled paper pulp using normal water (tap water), and the surfactant used at the same time is removed. A large amount of water was required for washing. Moreover, every time the number of water washings was increased due to the influence of the remaining acid, the outflow of pulp fibers also increased, and the recovery rate (20-40%) as waste paper pulp decreased.

以上のことから、本願の古新聞紙や印刷された古紙を原料とした古紙パルプの製造方法は、塩の電気分解によって得られたアルカリ性電解水を利用する方法がよく、高い白色度を要求しないトイレットペーパーなどに利用することが可能であり、リサイクル古紙パルプ資材として、回収できる処理方法を開発したものである。   From the above, the method for producing waste paper pulp made from the used newspaper and printed waste paper of this application is a method that uses alkaline electrolyzed water obtained by electrolysis of salt, and does not require high whiteness. It can be used for paper, etc. and has been developed as a recycled waste paper pulp material that can be recovered.

尚、前記脱インク（脱墨）処理した初回の排水についてのリサイクル使用が可能であるか、否かについては、カチオン性高分子凝集剤を添加することにより凝集分離は可能となり、排水処理においても公害汚染を防止できるものである。   Whether or not the first drainage after the deinking (deinking) treatment can be recycled can be flocculated and separated by adding a cationic polymer flocculant. It can prevent pollution.

そして、この発明に使用するアルカリ性電解水と、酸性電解水及び水道水を用いて脱墨促進作用の実験を行った。その方法は次の通りである。
１． 回収された古新聞紙等の印刷された古紙を小片（約５ｃｍ×５ｃｍ）に裁断し、その５ｇをづつをとる。
２． ミキサーにこれら裁断された上記の古紙を、５００ミリリットルの酸性電解水、アルカリ性電解水、そして水道水を注いだ。
３． 使用した界面活性剤（直鎖型アルキルベンゼンスルホン酸ナトリウム）は、本条件下では、０．２ミリリットルを添加した。
４． ミキサーにて攪拌し、離解・脱墨した３種類の古紙パルプを得た。
５． １０リットル容器に水道水を５リットル入れ、得られた古紙パルプを洗浄した。 （汚れの程度を確認しながら３回繰り返し洗浄を行った。）
６． １００°Ｃの温風で１０分間乾燥させた。
７． 得られたそれぞれの再生紙の白色度を色差計（Macbeth 社製 ＣＯＬＯＲ−ＥＹＥ 2020）にて測定し白色度を検討し評価を行った。
その結果、図３に示した結果となった。 And the experiment of the deinking promotion effect | action was done using the alkaline electrolyzed water used for this invention, acidic electrolyzed water, and tap water. The method is as follows.
1. Printed used newspaper such as old newspaper is cut into small pieces (about 5 cm × 5 cm), and 5 g of each is taken.
2. The above-mentioned cut waste paper was poured into a mixer with 500 ml of acidic electrolyzed water, alkaline electrolyzed water, and tap water.
3. The surfactant used (sodium linear alkylbenzene sulfonate) was added in an amount of 0.2 ml under these conditions.
4). Three types of waste paper pulp were obtained by stirring and deinking with a mixer.
5). 5 liters of tap water was placed in a 10 liter container, and the resulting waste paper pulp was washed. (Washing was repeated three times while checking the degree of contamination.)
6). It was dried for 10 minutes with 100 ° C warm air.
7). The whiteness of each of the obtained recycled papers was measured with a color difference meter (COLOR-EYE 2020 manufactured by Macbeth), and the whiteness was examined and evaluated.
As a result, the result shown in FIG. 3 was obtained.

この発明に使用するアルカリ性電解水を用いた場合は、白色度：６３．７３％、酸性電解水を用いた場合は、白色度：６１．５２％、そして水道水を用いた場合は、白色度：５９．１６％となった。   When using alkaline electrolyzed water used in the present invention, whiteness: 63.73%, when using acid electrolyzed water, whiteness: 61.52%, and when using tap water, whiteness : 59.16%.

これらの結果、
１． 白色度からアルカリ性電解水を用いて離解・脱墨工程を行ったものが、最も高い値を示し、ついで、酸性電解水、水道水の順であった。
２． アルカリ性電解水の白色度が最も高い値になった理由としては、脱墨されたカーボン粒子を含む油がアルカリ性側において添加した中性の界面活性剤のミセル生成における熱力学的パラメーターが大きく、ミセル形成と同時に吸着凝集が良好に生起されたものと考えられる。
３． 酸性電解水の白色度が水道水よりも高くなったのは、含有される次亜塩素酸の漂白作用と酸性側における添加した中性の界面活性剤のミセル生成が一部形成された影響によるものと考えられる。
４． 予備試験の結果、古紙パルプの洗浄には、経済的にも水道水を使用した方が望ましい。
５． 添加する界面活性剤は、０．２ミリリットル／リットル以上が必要であり、求める再生紙の白色度により添加量を増減することが確認できた。 These results
1. What performed the disaggregation and deinking process using alkaline electrolyzed water from the whiteness showed the highest value, and was followed by acidic electrolyzed water and tap water.
2. The reason why the whiteness of the alkaline electrolyzed water reached the highest value is that the oil containing the deinked carbon particles has a large thermodynamic parameter in the micelle formation of the neutral surfactant added on the alkaline side. It is considered that the adsorption and aggregation occurred satisfactorily simultaneously with the formation.
3. The whiteness of acidic electrolyzed water was higher than that of tap water because of the partial formation of micelle formation of the neutral surfactant added on the acidic side and the bleaching action of the contained hypochlorous acid. It is considered a thing.
4). As a result of the preliminary test, it is desirable to use tap water economically for cleaning waste paper pulp.
5). The surfactant to be added is required to be 0.2 ml / liter or more, and it was confirmed that the amount of addition and decrease was increased / decreased depending on the desired whiteness of recycled paper.

この試験により、電解水は界面活性剤との併用により脱墨を促進させる作用があることが確認できた。また、電解水を使用することにより脱墨工程における界面活性剤の使用を削減することが可能と考えられる。   This test confirmed that electrolyzed water has the effect of promoting deinking when used in combination with a surfactant. In addition, it is considered possible to reduce the use of a surfactant in the deinking process by using electrolyzed water.

この発明の古新聞紙や印刷された古紙を原料とした古紙パルプの製造方法の技術を確立し、実施・販売することにより、産業上利用できるものである。   It can be utilized industrially by establishing, implementing, and selling the technology of a method for producing waste paper pulp using the old newspaper and printed waste paper of this invention as a raw material.

１ 小片化された古新聞紙
２ ミキサー
３ アルカリ性電解水
４ 攪拌槽
５ 羽根型攪拌棒
６ 古紙パルプ DESCRIPTION OF SYMBOLS 1 Shredded old newspaper 2 Mixer 3 Alkaline electrolysis water 4 Stirrer tank 5 Feather-type stir bar 6 Waste paper pulp

Claims (2)

古新聞紙等の印刷された古紙を原料とし、古紙パルプを得る製造工程であって、印刷された古紙を裁断して小片化し、これらの小片化した古紙に、適宜な量の電解水を加え、高速攪拌して古紙を繊維状にする工程と、この繊維状の古紙を、攪拌容器に投入し、適宜な量の液体の界面活性剤である離解溶液を加えた後、緩やかに攪拌しながら該溶液表面に遊離されるインクを除去する工程と、これら離解溶液を脱インクする工程において使用する電解水が、微量の精製塩を加えた水を電気分解することにより得られたアルカリ性電解水であることを特徴とする等の印刷された古紙を原料とした古紙パルプの製造方法。   It is a manufacturing process to obtain waste paper pulp using printed waste paper such as old newspaper, and cut the printed waste paper into small pieces, and add an appropriate amount of electrolyzed water to these pieces of waste paper, The process of making the used paper into a fibrous form by stirring at high speed, and this fibrous used paper is put into a stirring container, and after adding a disaggregation solution that is an appropriate amount of a liquid surfactant, The electrolyzed water used in the step of removing ink liberated on the surface of the solution and the step of deinking these disaggregation solutions is alkaline electrolyzed water obtained by electrolyzing water to which a small amount of purified salt is added. A method for producing waste paper pulp using printed waste paper as a raw material. 液体の界面活性剤が、直鎖型アルキルベンゼンスルホン酸ナトリウムであることを特徴とする請求項１記載の印刷された古紙を原料とした古紙パルプの製造方法。   The method for producing waste paper pulp using printed waste paper as a raw material according to claim 1, wherein the liquid surfactant is sodium alkylbenzene sulfonate.
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CN2010102480946A CN101994269A (en) 2009-08-06 2010-08-04 Method for producing waste paper pulp using the printed waste paper as raw material
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