JPH048554B2 - - Google Patents
Info
- Publication number
- JPH048554B2 JPH048554B2 JP17187286A JP17187286A JPH048554B2 JP H048554 B2 JPH048554 B2 JP H048554B2 JP 17187286 A JP17187286 A JP 17187286A JP 17187286 A JP17187286 A JP 17187286A JP H048554 B2 JPH048554 B2 JP H048554B2
- Authority
- JP
- Japan
- Prior art keywords
- pulp
- concentration
- waste paper
- weight
- printed waste
- 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 - Lifetime
Links
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 27
- 239000010893 paper waste Substances 0.000 claims description 24
- 239000003513 alkali Substances 0.000 claims description 14
- 239000002761 deinking Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 11
- 235000011121 sodium hydroxide Nutrition 0.000 claims description 9
- 238000011282 treatment Methods 0.000 claims description 9
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 239000007844 bleaching agent Substances 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000010907 mechanical stirring Methods 0.000 claims description 5
- 239000004094 surface-active agent Substances 0.000 claims description 5
- 239000004115 Sodium Silicate Substances 0.000 claims description 4
- 230000032683 aging Effects 0.000 claims description 4
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 4
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 238000007865 diluting Methods 0.000 claims description 2
- 230000005070 ripening Effects 0.000 claims description 2
- 239000000835 fiber Substances 0.000 description 17
- 230000000052 comparative effect Effects 0.000 description 9
- 229920001131 Pulp (paper) Polymers 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- 238000004898 kneading Methods 0.000 description 3
- 238000000691 measurement method Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000010561 standard procedure Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 2
- 238000007644 letterpress printing Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000007645 offset printing Methods 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 238000004061 bleaching Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 238000009897 hydrogen peroxide bleaching Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000013055 pulp slurry Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002699 waste material 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)
Description
〔産業上の利用分野〕
本発明は、オフセツト印刷古紙を含有する印刷
古紙からインキが付着したままの未脱墨繊維（以
下黒ヒゲという）。が少く、かつ白色度が高いパ
ルプを得る脱墨方法に関する。
〔従来の技術〕
従来、廃資源の有効利用の見地から古紙の再利
用が行なわれている。一方、印刷技術の面からは
凸版印刷より印刷面がきれいなオフセツト印刷が
近来増加してきている。
しかし、凸版印刷用のインキとオフセツト印刷
用のインキではその組成が異なる。その１例を次
表に示す。
[Industrial Application Field] The present invention relates to undeinked fibers (hereinafter referred to as black whiskers) to which ink remains attached from printed waste paper containing offset printed waste paper. The present invention relates to a deinking method for obtaining pulp with low whiteness and high whiteness. [Prior Art] Conventionally, waste paper has been recycled from the standpoint of effectively utilizing waste resources. On the other hand, in terms of printing technology, offset printing, which has a cleaner printing surface than letterpress printing, has been increasing in recent years. However, ink for letterpress printing and ink for offset printing have different compositions. An example is shown in the table below.
本発明の目的は前記方法によつて製造されたパ
ルプを、後処理することにより、更に高白色度で
黒ヒゲの数の少ない高品位パルプを製造する方法
を提供することである。
〔発明の構成〕
前記目的を達成するための本発明の印刷古紙の
脱墨方法は、オフセツト印刷古紙を含有するパル
プスラリーを次の第１工程と第２工程とを包含す
る方法よりなる第１の発明と、更に第３工程をも
包含する第２の発明よりなるものである。
第１工程：
オフセツト印刷古紙を含有する印刷古紙に、苛
性ソーダ、ケイ酸ソーダ及び界面活性剤よりなる
脱墨剤及び過酸化水素漂白剤を添加し、15重量％
以上のパルプ濃度並びに5.0ｇ／（NaOHとし
て）以上のアルカリ濃度において、レフアイナ
ー、ニーダー、二軸ミキサー又はデイスパーザー
を使用し、加温下で圧縮力を与えながら機械的撹
拌処理を行なう工程。
第２工程：
第１工程で処理されたパルプを0.5時間以上熟
成した後に該パルプの濃度を15〜25重量％に保持
し、レフアイナー、ニーダー、二軸ミキサー又は
デイスパーザーを使用し、圧縮力を与えながら機
械的撹拌処理を行なう工程。
この際の処理温度は常温又は加温下のどちらで
も良い。
第３工程：
（これは第２の発明に含まれる工程である。）
第２工程で処理されたパルプを７％以下の濃度
に稀釈して機械的撹拌を行う工程。
つぎに本発明について詳しく説明する。
本発明で使用できる古紙原料としては、オフセ
ツト印刷古紙それ自体又はこれに凸版古紙が混入
しているものでも何ら差し支えない。
古紙パルプに添加する脱墨剤は苛性ソーダー、
ケイ酸ソーダ及び界面活性剤等からなり、特にア
ルカリ剤の添加率が重要な役目を果し、古紙パル
プが接するアルカリ濃度として5.0ｇ／
（NaOHとして）以上が必要である。例えば、通
常行なわれているパルプ濃度5.0重量％、アルカ
リ添加率3.0重量％（対パルプ）とした場合のパ
ルプ液のアルカリ濃度は1.6ｇ／と少なく、こ
の条件ではオフセツト印刷古紙は全く脱墨されな
いことが認められた。そして、前述の高い濃度の
アルカリが、強固に接着しているオフセツトイン
キの被膜を壊し繊維からインキを離脱させる作用
を有するものであつて、前記の先願発明で開示し
た如く実験によれば5.0ｇ／より低いアルカリ
濃度ではオフセツトインキの被膜を壊す反応が遅
く、十分な脱墨効果が奏されない。
本発明の第１工程におけるパルプ濃度が高いこ
とは添加するアルカリ剤の量を減少しうる意義を
有するが、それ以外に本発明においては、パルプ
に圧縮力を与えた状態で機械的撹拌を行うための
必須条件となつている。即ち加温下でアルカリ処
理されたオフセツト印刷古紙のインキ被膜は壊れ
易くなるが、パルプに圧縮力を加え繊維と繊維が
密に接触した状態で機械的撹拌を行なうことによ
り繊維からのインキ被膜の剥離が一層促進され著
しい効果を発揮する。そしてパルプ濃度としては
15％以上が必要であり、これより低いパルプ濃度
ではパルプに十分な圧縮力を与えることが困難と
なり繊維からのインキの剥離を効率的に行なうこ
とができない。望ましいパルプ濃度は25〜35重量
％である。パルプに及ぼす圧縮力については厳密
に測定することは困難であるが、種々の試験結果
から0.5〜1.0Kg／cm2以上の圧力が必要であると考
えられる。
本発明の第１工程は加温下で行なわれるが、こ
れはアルカリによるインキ被膜の破壊作用を促進
するとともに漂白剤としてのH2O2による漂白作
用を効率的に行なうために必要であり、温度は50
℃以上が望ましく、50℃以下ではインキの離脱も
十分でなく、又過酸化水素漂白剤が効果的に作用
しないため白色度の上昇率も劣る。なおH2O2の
濃度は一般に対パルプ重量当り0.5〜５重量％の
濃度が望ましい。
次に第２工程においては第１工程で処理後のパ
ルプを高アルカリ濃度雰囲気の中で一定温度下で
一定時間熟成せしめることによつて、第１工程に
おける処理で繊維から離脱していないインキをア
ルカリと反応させインキの被膜を壊し易くした上
で、再びレフアイナー、ニーダー、二軸ミキサー
又はデイスパーザーを使用して圧縮力を与えなが
ら機械的撹拌を行うことによつて繊維からインク
を離脱させる。この時のパルプ濃度は15％以上25
％以下であることが必要であり、15％未満のパル
プ濃度ではパルプに十分圧縮力をかけることが困
難となり、繊維からのインクの剥離を効率的に行
なうことができないこと、及び25％を超えるパル
プ濃度では、離脱したインキを小粒子に破壊し、
このインキを逆にパルプ繊維にすり込む現象が起
り、繊維からのイキの離脱を効率的に行えないと
いう欠点即ち、高白色度のパルプが得られないと
いう欠点がある。
パルプを熟成せしめる時間は、繊維から離脱し
ていないインキがアルカリと十分に反応するため
に必要なもので、パルプ濃度、アルカリ添加量、
温度などにより最適時間は変つて来るが通常0.5
〜４時間であり、好ましくは１〜３時間である。
第２工程の処理において得られたパルプの白色度
及び黒ヒゲの数は、ある種の中級紙に使用可能な
ものである。
次に第３工程について説明する。第２工程で処
理されたパルプは既に大半のインキが繊維から離
脱されており、黒ヒゲはほとんどないが、それで
も未だインキの小粒子が、繊維に残留付着してい
る。
そこで、第２工程での処理パルプをパルプ濃度
を７重量％以下となるように稀釈し、低濃度叩解
機又は離解機に通し、繊維に強力な剪断力を与え
て繊維に付着しているインキの小粒子を分離する
ことによりパルプの白色度を更に向上させること
が可能となる。
パルプの処理濃度は７重量％以下であればよい
が、通常のポンプで移送を可能ならしめるために
は５重量％以下の濃度が好ましい。
以下に実施例及び比較例を記載するが、先づ実
施例及び比較例において使用した白色度及び黒ヒ
ゲ数の測定法について説明する。
白色度測定法
前処理：試料古紙パルプを100メツシユのワ
イヤークロスを張つた箱の中に入れて繊維から
離脱しているインキを清水で充分に洗い流して
洗浄パルプを作成する。
の前処理で得られた洗浄パルプをTAPPI
標準法により125ｇ／m2の白色度測定用シート
を作成する。
ハンター反射率計（JIS P8123）で３ケ所の
白色度を測定し、その平均値を洗浄パルプの白
色度（％）として表示する。
黒ヒゲ個数測定法
前処理：白色度測定法における前処理と同様
に前処理を行ない洗浄パルプを作成する。
洗浄パルプを用いてTAPPI標準法により30
ｇ／m2の黒ヒゲ測定用シートを作成する。
黒ヒゲは、で作成した黒ヒゲ測定用シート
を水で濡らして蛍光灯の透過光で２cm×２cm□
の中の長さ１mm以上の黒ヒゲ数を数えて、洗浄
パルプ１ｇ当りの黒ヒゲの個数で表示する。
＜実施例＞
以下に実施例及び比較例を示し本発明につき説
明する。
原料としてはオフセツト印刷された新聞古紙と
中質古紙の１：１の混合物を使用した。
なお比較例及び実施例における％は全て重量％
を示す。
比較例 １〜６
予め離解し脱水した故紙パルプ50ｇをポリエチ
レン袋に入れ表−１に示す所定のパルプ濃度に清
水で希釈し、60℃の温浴中で予熱し、これに脱墨
剤としてNaOH、Na2SiO3、界面活性剤、漂白剤
として過酸化水素を添加し、薬品が均一に接触す
るように良く混合した後、試験用ニーダー（森山
製作所製）に移し、60℃の加温下で20分間ニーデ
イングした。ニーデイング後、この温度で１時間
保持した後、1.0％に希釈してフローテーシヨン
処理しTappi標準法により白色度測定用シートを
作成した。
このシートは本発明の第一工程で処理後、第２
工程の0.5時間以上熟成処理した段階までのパル
プに相当する。
白色度及び黒ヒゲ個数を測定した原価を表−１
に示す。
実施例１〜３、比較例７〜９
比較例４に於てパルプ濃度25％でニーテイング
処理したパルプをそのままの状態で２時間熟成せ
しめ、アルカリの十分反応させた後表−１に示す
パルプ濃度に稀釈又は濃縮し、再び20分間ニーデ
イングした後、比較例１〜６と同様に稀釈、フロ
ーテーシヨン処理しシートを作成した。これは本
発明の第２工程処理後のパルプに相当する。
白色度及び黒ヒゲ個数の測定結果を表−１に併
記する。
実施例 ４〜５
実施例１、２に於てニーデイング処理したパル
プを濃度4.5％に稀釈し、試験用の低濃度叩解機
で処理したパルプを、比較例１〜６と同様に稀
釈、フローテーシヨン処理してシートを作成し
た。結果を表−１に示す。
これは本発明（第２発明）の第３工程処理後の
パルプに相当する。
なお、実施例４、５（実験No.13、14）の白色度、
黒ヒゲ個数を示す数値の（ ）内の値は夫々対応
する実施例１及び２の値である。
実施例 ６〜12
実施例２に於て熟成時間の影響を見るために熟
成時間を0.5〜５時間に変化させた。結果を表−
１に示す。
An object of the present invention is to provide a method for producing high-quality pulp with higher whiteness and fewer black whiskers by post-processing the pulp produced by the above method. [Structure of the Invention] To achieve the above object, the method for deinking printed waste paper of the present invention is to process a pulp slurry containing offset printed waste paper into a first process comprising the following first step and second step. The second invention further includes the third step. 1st step: A deinking agent consisting of caustic soda, sodium silicate, and a surfactant and a hydrogen peroxide bleaching agent are added to the printed waste paper containing offset printed waste paper to give a concentration of 15% by weight.
A step of mechanically stirring the pulp using a refiner, kneader, twin-shaft mixer, or disperser at the pulp concentration above and an alkali concentration of 5.0 g/(as NaOH) or above while applying compressive force under heating. 2nd step: After aging the pulp treated in the 1st step for 0.5 hours or more, the concentration of the pulp is maintained at 15 to 25% by weight, and compressive force is applied using a refiner, kneader, twin-shaft mixer, or disperser. A process in which mechanical stirring is performed while The treatment temperature at this time may be either room temperature or heating. Third step: (This is a step included in the second invention.) A step in which the pulp treated in the second step is diluted to a concentration of 7% or less and mechanically stirred. Next, the present invention will be explained in detail. The waste paper raw material that can be used in the present invention may be offset printed waste paper itself or used letterpress paper mixed therein. The deinking agent added to waste paper pulp is caustic soda,
Consisting of sodium silicate, surfactant, etc., the addition rate of the alkaline agent plays an especially important role, and the alkali concentration in contact with the waste paper pulp is 5.0g/
(as NaOH) or more is required. For example, when the pulp concentration is usually 5.0% by weight and the alkali addition rate is 3.0% by weight (based on the pulp), the alkaline concentration of the pulp liquid is as low as 1.6g/, and under these conditions, offset printed waste paper is not deinked at all. This was recognized. The alkali at a high concentration mentioned above has the effect of breaking the strongly adhering film of offset ink and separating the ink from the fibers, and according to experiments as disclosed in the earlier invention, If the alkali concentration is lower than 5.0 g/l, the reaction that destroys the offset ink film will be slow and a sufficient deinking effect will not be achieved. The high pulp concentration in the first step of the present invention has the significance of being able to reduce the amount of alkaline agent added, but in addition to this, in the present invention, mechanical stirring is performed while applying compressive force to the pulp. It has become an essential condition for In other words, the ink film on offset printed waste paper treated with alkali under heating becomes fragile, but by applying compressive force to the pulp and performing mechanical stirring while the fibers are in close contact, the ink film from the fibers can be removed. Peeling is further promoted and a remarkable effect is exhibited. And as pulp density
A pulp concentration of 15% or more is required; if the pulp concentration is lower than this, it becomes difficult to apply sufficient compressive force to the pulp, and the ink cannot be efficiently peeled from the fibers. The preferred pulp concentration is 25-35% by weight. Although it is difficult to precisely measure the compressive force exerted on the pulp, it is thought from various test results that a pressure of 0.5 to 1.0 Kg/cm 2 or more is required. The first step of the present invention is carried out under heating, which is necessary to promote the destruction of the ink film by the alkali and to efficiently carry out the bleaching action by H 2 O 2 as a bleaching agent. temperature is 50
℃ or higher is desirable; below 50℃, ink separation is not sufficient and hydrogen peroxide bleach does not work effectively, resulting in poor whiteness increase rate. In general, the concentration of H 2 O 2 is preferably 0.5 to 5% by weight based on the weight of the pulp. Next, in the second step, the pulp treated in the first step is aged for a certain period of time at a constant temperature in an atmosphere with high alkali concentration, thereby removing the ink that has not separated from the fibers during the treatment in the first step. After reacting with an alkali to make the ink film easier to break, the ink is separated from the fibers by mechanical stirring while applying compressive force using a refiner, kneader, twin-screw mixer, or disperser. The pulp density at this time is more than 15%25
% or less, and if the pulp concentration is less than 15%, it will be difficult to apply sufficient compressive force to the pulp and it will not be possible to remove the ink from the fibers efficiently, and if the pulp concentration is less than 25% Pulp density breaks the detached ink into small particles,
A phenomenon in which this ink is rubbed into the pulp fibers occurs, and there is a drawback that the ink cannot be efficiently separated from the fibers, that is, a pulp with high whiteness cannot be obtained. The time for ripening the pulp is necessary for the ink that has not separated from the fibers to sufficiently react with the alkali, and depends on the pulp concentration, the amount of alkali added,
The optimal time will vary depending on the temperature, etc., but it is usually 0.5
~4 hours, preferably 1 to 3 hours.
The whiteness and number of black whiskers of the pulp obtained in the second step treatment are such that it can be used for certain types of medium grade papers. Next, the third step will be explained. In the pulp treated in the second step, most of the ink has already been separated from the fibers and there are almost no black whiskers, but small particles of ink still remain attached to the fibers. Therefore, the treated pulp in the second step is diluted to a pulp concentration of 7% by weight or less, and passed through a low-concentration beater or disintegrator to apply strong shearing force to the fibers and remove the ink attached to the fibers. By separating the small particles, it becomes possible to further improve the whiteness of the pulp. The treatment concentration of the pulp may be 7% by weight or less, but a concentration of 5% by weight or less is preferred in order to enable transport with a normal pump. Examples and comparative examples will be described below, but first, methods for measuring whiteness and number of black whiskers used in the examples and comparative examples will be explained. Whiteness measurement method Pretreatment: Place the sample waste paper pulp in a box lined with 100 mesh wire cloth, and thoroughly wash away the ink that has separated from the fibers with clean water to create a washed pulp. TAPPI the washed pulp obtained from the pretreatment of
A sheet for measuring whiteness of 125 g/m 2 is prepared using a standard method. The whiteness is measured at three locations using a Hunter reflectance meter (JIS P8123), and the average value is displayed as the whiteness (%) of the washed pulp. Black beard count measurement method Pretreatment: Pretreatment is performed in the same manner as in the whiteness measurement method to create a washed pulp. 30 by TAPPI standard method using washed pulp
Create a sheet for measuring g/ m2 black whiskers. To measure black beards, wet the black beard measurement sheet made with water and measure it with transmitted light from a fluorescent light to measure 2cm x 2cm□
Count the number of black whiskers with a length of 1 mm or more in the container, and express the number of black whiskers per gram of washed pulp. <Example> The present invention will be explained below by showing Examples and Comparative Examples. As a raw material, a 1:1 mixture of offset-printed newspaper waste paper and medium quality waste paper was used. All percentages in comparative examples and examples are by weight.
shows. Comparative Examples 1 to 6 50g of pre-disintegrated and dehydrated waste paper pulp was placed in a polyethylene bag, diluted with clean water to the predetermined pulp concentration shown in Table 1, preheated in a 60°C hot bath, and NaOH, deinking agent, and After adding Na 2 SiO 3 , a surfactant, and hydrogen peroxide as a bleaching agent and mixing well so that the chemicals come into uniform contact, the mixture was transferred to a test kneader (manufactured by Moriyama Seisakusho) and heated at 60°C. Kneading was performed for 20 minutes. After kneading, the mixture was maintained at this temperature for 1 hour, diluted to 1.0%, floated, and a sheet for measuring whiteness was prepared using the Tappi standard method. After this sheet is processed in the first step of the present invention, it is processed in the second step.
This corresponds to the pulp up to the stage where the process has been aged for 0.5 hours or more. Table 1 shows the cost of measuring whiteness and number of black whiskers.
Shown below. Examples 1 to 3, Comparative Examples 7 to 9 In Comparative Example 4, the pulp that had been kneaded at a pulp concentration of 25% was aged as it was for 2 hours, and after sufficient alkali reaction, the pulp concentration shown in Table 1 was obtained. After diluting or concentrating the mixture and kneading it again for 20 minutes, it was diluted and floated in the same manner as in Comparative Examples 1 to 6 to prepare a sheet. This corresponds to the pulp after the second step treatment of the present invention. The measurement results of whiteness and number of black whiskers are also listed in Table 1. Examples 4-5 The pulp kneaded in Examples 1 and 2 was diluted to a concentration of 4.5%, and the pulp treated with a low-density beating machine for testing was diluted and flow-treated in the same manner as in Comparative Examples 1-6. A sheet was created by applying color treatment. The results are shown in Table-1. This corresponds to the pulp after the third step treatment of the present invention (second invention). In addition, the whiteness of Examples 4 and 5 (Experiment Nos. 13 and 14),
The values in parentheses of the numerical values indicating the number of black whiskers are the values of the corresponding Examples 1 and 2, respectively. Examples 6 to 12 In Example 2, the aging time was varied from 0.5 to 5 hours to examine the effect of aging time. Display the results -
Shown in 1.
【表】【table】
本発明の方法によつて処理しこオフセツト印刷
古紙を含有する印刷古紙はすでに繊維から離脱し
ているインキを常法のフローテーシヨン、洗浄な
どの処理により除去することにより脱墨パルプが
得られる。
この脱墨パルプは従来の脱墨処理では得ること
が不可能であつた高白色度でかつ黒ヒゲの数の少
ない高品位のものであり、高グレードの中級紙に
配合が可能であり、原木の節減及びエネルギーの
節減という効果を得ることが出来る。
Deinked pulp can be obtained by removing the ink that has already separated from the fibers of the printed paper containing offset printed waste paper treated by the method of the present invention by conventional treatments such as flotation and washing. . This deinked pulp has high whiteness and a small number of black whiskers, which was impossible to obtain with conventional deinking processing, and is of high quality, and can be blended into high-grade intermediate paper. It is possible to obtain the effects of saving energy and saving energy.
Claims (1)
苛性ソーダ、ケイ酸ソーダ及び界面活性剤よりな
る脱墨剤及び過酸化水素漂白剤を添加し、15重量
％以上のパルプ濃度並びに5.0ｇ／（NaOH）
として以上のアルカリ濃度において、レフアイナ
ー、ニーダー、二軸ミキサー又はデイスパーザー
を使用して加温下で圧縮力を与えながら機械的撹
拌処理を行なう第１工程と、第１工程で処理され
たパルプを0.5時間以上熟成した後に該パルプの
濃度を15〜25重量％に保持し、レフアイナー、ニ
ーダー、二軸ミキサー又はデイスパーザーを使用
して圧縮力を与えながら機械的撹拌処理を行う第
２工程とを包含することを特徴とする印刷古紙の
脱墨方法。 ２ オフセツト印刷古紙を含有する印刷古紙に、
苛性ソーダ、ケイ酸ソーダ及び界面活性剤よりな
る脱墨剤及び過酸化水素漂白剤を添加し、15重量
％以上のパルプ濃度並びに5.0ｇ／（NaOH）
として以上のアルカリ濃度において、レフアイナ
ー、ニーダー、二軸ミキサー又はデイスパーザー
を使用して加温下で圧縮力を与えながら機械的撹
拌処理を行なう第１工程と、該工程で処理された
パルプを0.5時間以上熟成した後に該パルプの濃
度を15〜25重量％に保持し、レフアイナー、ニー
ダー、二軸ミキサー又はデイスパーザーを使用し
て圧縮力を与えながら機械的撹拌処理を行なう第
２工程と、第２工程で処理されたパルプを７重量
％以下の濃度に稀釈し、更に機械的撹拌を行なう
第３工程とを包含することを特徴とする印刷古紙
の脱墨方法。[Claims] 1. Printed waste paper containing offset printed waste paper,
A deinking agent consisting of caustic soda, sodium silicate and a surfactant and a hydrogen peroxide bleach are added to achieve a pulp concentration of 15% by weight or more and 5.0g/(NaOH).
The first step is to mechanically stir the pulp using a refiner, kneader, twin-screw mixer, or disperser while applying compressive force under heating at an alkali concentration of 0.5 or more. A second step of maintaining the concentration of the pulp at 15 to 25% by weight after aging for more than an hour and performing mechanical stirring treatment while applying compressive force using a refiner, kneader, twin-screw mixer, or disperser. A method for deinking printed waste paper. 2 For printed waste paper containing offset printed waste paper,
A deinking agent consisting of caustic soda, sodium silicate and a surfactant and a hydrogen peroxide bleach are added to achieve a pulp concentration of 15% by weight or more and 5.0g/(NaOH).
The first step is to mechanically stir the pulp using a refiner, kneader, twin-screw mixer, or disperser while applying compressive force under heating at an alkali concentration higher than After the above ripening, the pulp is maintained at a concentration of 15 to 25% by weight and mechanically stirred while applying compressive force using a refiner, kneader, twin-screw mixer, or disperser; A method for deinking printed waste paper, comprising the steps of: diluting the treated pulp to a concentration of 7% by weight or less, and further mechanically stirring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61171872A JPS6328992A (en) | 1986-07-23 | 1986-07-23 | Deinking of old printed paper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61171872A JPS6328992A (en) | 1986-07-23 | 1986-07-23 | Deinking of old printed paper |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6328992A JPS6328992A (en) | 1988-02-06 |
| JPH048554B2 true JPH048554B2 (en) | 1992-02-17 |
Family
ID=15931355
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61171872A Granted JPS6328992A (en) | 1986-07-23 | 1986-07-23 | Deinking of old printed paper |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6328992A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02221480A (en) * | 1989-02-23 | 1990-09-04 | Honshu Paper Co Ltd | Method for deinking printed waste paper |
| JPH04333682A (en) * | 1991-05-10 | 1992-11-20 | Sanyo Kokusaku Pulp Co Ltd | Method for deinking toner-printed waste paper |
| US5370770A (en) * | 1992-11-09 | 1994-12-06 | The Mead Corporation | Method for deinking printed waste paper using soybean peroxidase |
| US7566014B2 (en) * | 2006-08-31 | 2009-07-28 | Kx Technologies Llc | Process for producing fibrillated fibers |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5352704A (en) * | 1976-10-19 | 1978-05-13 | Masashi Kobayashi | Process for regenerating printed paper |
| JPS58126388A (en) * | 1982-01-14 | 1983-07-27 | ヨツト エム フオイト ゲーエムベーハー | Process for producing fibrous stock material from used paper |
| JPS6111353A (en) * | 1984-06-18 | 1986-01-18 | 太田 範子 | Magnet stopper |
| JPS6260515A (en) * | 1985-09-09 | 1987-03-17 | 松下電工株式会社 | Electromotive toothbrush |
-
1986
- 1986-07-23 JP JP61171872A patent/JPS6328992A/en active Granted
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5352704A (en) * | 1976-10-19 | 1978-05-13 | Masashi Kobayashi | Process for regenerating printed paper |
| JPS58126388A (en) * | 1982-01-14 | 1983-07-27 | ヨツト エム フオイト ゲーエムベーハー | Process for producing fibrous stock material from used paper |
| JPS6111353A (en) * | 1984-06-18 | 1986-01-18 | 太田 範子 | Magnet stopper |
| JPS6260515A (en) * | 1985-09-09 | 1987-03-17 | 松下電工株式会社 | Electromotive toothbrush |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6328992A (en) | 1988-02-06 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |