JPH10292281A - Production of wastepaper pulp - Google Patents
Production of wastepaper pulpInfo
- Publication number
- JPH10292281A JPH10292281A JP9346097A JP9346097A JPH10292281A JP H10292281 A JPH10292281 A JP H10292281A JP 9346097 A JP9346097 A JP 9346097A JP 9346097 A JP9346097 A JP 9346097A JP H10292281 A JPH10292281 A JP H10292281A
- Authority
- JP
- Japan
- Prior art keywords
- pulp
- paper
- long fiber
- strength
- waste paper
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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】本発明は古紙パルプの製造方
法に関し、特に古紙パルプを含む紙、板紙の強度を向上
させるための方法に関する。The present invention relates to a method for producing waste paper pulp, and more particularly to a method for improving the strength of paper and paperboard containing waste paper pulp.
【０００２】[0002]
【従来の技術】紙の強度（以下紙力と称する）としては
裂断長、破裂、引き裂き、耐折、層間強度、剛度などが
あるが、多くの場合これらの値は高いものが望まれる。
木材資源の保護や紙のリサイクルの観点から、古紙をパ
ルプ原料として用いることが多くなり、その使用比率も
増加する傾向にある。一般的に古紙パルプはバージンパ
ルプより強度が劣り、リサイクルの回数がますに従い劣
化して強度が低下していくことが知られている。また、
近年、原料古紙中のコート紙比率が高まり、古紙パルプ
中の灰分含有量が増大していることも強度低下の原因と
なっている。2. Description of the Related Art Paper strength (hereinafter referred to as "paper strength") includes tear length, rupture, tearing, folding resistance, interlayer strength, stiffness, and the like. In many cases, higher values are desired.
From the viewpoint of protection of wood resources and recycling of paper, waste paper is often used as a raw material for pulp, and its usage ratio tends to increase. It is generally known that waste paper pulp has lower strength than virgin pulp, and deteriorates and strength decreases as the number of times of recycling increases. Also,
In recent years, the ratio of coated paper in the raw material waste paper has increased, and the ash content in the waste paper pulp has also increased, which also causes a decrease in strength.
【０００３】一般に紙力を向上させる方法としては、原
料パルプの叩解、紙力増強剤の使用、が挙げられる。原
料パルプの叩解を進めると紙力は向上するものの、濾水
性が悪くなり、抄紙速度が低下するので生産性が悪化す
る。特に、古紙パルプは微細繊維を多く含むため濾水性
が低く、叩解処理による強度向上には抄紙マシン操業の
面から限界がある。そこで、濾水性を悪化させずに紙力
を向上させるために、通常紙力増強剤を使用する。しか
しながら、紙力増強剤は高価であり、また抄紙系内の汚
れの原因ともなるため、その使用量は少ないほうが望ま
しい。また、近年、古紙パルプはコート紙由来のアニオ
ン性夾雑物を多く含むようになったため、紙力増強剤に
よる効果発現が低下している。最近、原料パルプにミク
ロフィブリル化繊維を配合する方法が提案されている。
例えば特開昭５８−１９７４００にはパルプを高圧下で
ホモジナイザー処理した微細繊維の添加、特開平６−１
３３６６８１および特開平７−２２９０８２にはパルプ
を湿式粉砕処理した微細繊維状セルロース物質の添加、
特開平８−１０９５９１には針葉樹パルプを高度粘状叩
解したパルプの添加、が開示されている。In general, methods for improving paper strength include beating raw pulp and using a paper strength enhancer. As the beating of the raw pulp proceeds, the paper strength is improved, but the drainage becomes poor and the papermaking speed is reduced, so that the productivity is deteriorated. In particular, waste paper pulp contains a large amount of fine fibers and thus has low drainage, and there is a limit in improving the strength by beating treatment from the viewpoint of operation of a papermaking machine. Therefore, in order to improve paper strength without deteriorating drainage, a paper strength enhancer is usually used. However, since the paper-strengthening agent is expensive and causes stains in the papermaking system, it is desirable that the amount used is small. Also, in recent years, wastepaper pulp has been rich in anionic contaminants derived from coated paper, and the effect of the paper strength enhancer has been reduced. Recently, a method of blending microfibrillated fibers with raw pulp has been proposed.
For example, JP-A-58-197400 discloses the addition of fine fibers obtained by subjecting pulp to high-pressure homogenization.
No. 336681 and Japanese Patent Application Laid-Open No. Hei 7-229082 discloses the addition of a fine fibrous cellulose material obtained by wet-milling pulp.
Japanese Patent Application Laid-Open No. Hei 8-109591 discloses the addition of pulp obtained by highly softly beaten softwood pulp.
【０００４】しかしながら、ミクロフィブリル化繊維の
紙力向上効果は、古紙パルプの場合、バージンパルプよ
りも小さい。これは以下のように説明される。すなわ
ち、ミクロフィブリル化繊維により繊維間のネットワー
クは補強されるが、このネットワークの発達が灰分の歩
留り向上をもたらす。ミクロフィブリル化繊維による強
度向上効果が灰分歩留り増による繊維間結合阻害により
相殺されると考えられる。このため、十分な紙力向上効
果を得るためにはミクロフィブリル化繊維の配合率が過
大となり、濾水性の低下をもたらし、抄紙マシン操業性
を悪化させる。[0004] However, the effect of microfibrillated fibers on paper strength is smaller in waste paper pulp than in virgin pulp. This is explained as follows. That is, the network between fibers is reinforced by the microfibrillated fibers, but the development of this network leads to an improvement in the yield of ash. It is considered that the strength-improving effect of the microfibrillated fibers is offset by the inter-fiber bond inhibition due to the increase in ash yield. For this reason, in order to obtain a sufficient paper strength improving effect, the compounding ratio of the microfibrillated fibers becomes excessive, resulting in a decrease in drainage and a deterioration in operability of a papermaking machine.
【０００５】[0005]
【発明が解決しようとする課題】古紙パルプの強度改善
のためミクロフィブリル化繊維を配合するにあたり、紙
力向上効果と抄紙マシン操業性の両立をはかることを課
題とする。SUMMARY OF THE INVENTION In blending microfibrillated fibers to improve the strength of waste paper pulp, it is an object of the present invention to achieve both the effect of improving paper strength and the operability of a papermaking machine.
【０００６】[0006]
【課題を解決するための手段】上記課題を解決するた
め、本発明は以下の構成を採る。即ち、本発明は以下の
３つの発明である。 （１） 古紙パルプに分級処理を施し短繊維フラクショ
ンを除去して長繊維フラクションを得た後、該長繊維フ
ラクションにミクロフィブリル化繊維を配合することを
特徴とする古紙パルプの製造方法。 （２） 前記（１）の分級処理において、処理前の古紙
パルプと処理後の長繊維フラクションのカナダ標準濾水
度の差が、５０〜２５０ｍｌ、好ましくは８０〜２００
ｍｌであることを特徴とする紙および古紙パルプの製造
方法。 （３） 長繊維フラクションに対して、ミクロフィブリ
ル化繊維を１〜１０重量％配合することを特徴とする前
記（１）または（２）に記載の古紙パルプ製造方法。In order to solve the above problems, the present invention employs the following constitution. That is, the present invention is the following three inventions. (1) A method for producing waste paper pulp, comprising subjecting waste paper pulp to a classification treatment to remove short fiber fractions to obtain long fiber fractions, and then mixing microfibrillated fibers with the long fiber fractions. (2) In the classification treatment of the above (1), the difference in the Canadian standard freeness between the waste paper pulp before treatment and the long fiber fraction after treatment is 50 to 250 ml, preferably 80 to 200 ml.
ml of paper and waste paper pulp. (3) The method for producing waste paper pulp according to (1) or (2), wherein 1 to 10% by weight of microfibrillated fibers is blended with respect to the long fiber fraction.
【０００７】本発明の製造方法は、古紙パルプ製造プロ
セスにおいて、まず、古紙パルプを大量の水で希釈して
公知の方法で分級する。分級の条件は特に制限されない
が、パルプ濃度１．５％以下まで希釈した後に分級装置
に供することが望ましい。この分級処理により、古紙パ
ルプは長繊維に富む長繊維フラクションと、微細繊維、
灰分（内添填料、コート紙塗工層由来の顔料）に富む短
繊維フラクションをに分級される。ミクロフィブリル化
繊維配合による紙力向上効果発現のためには、長繊維フ
ラクションのカナダ標準濾水度（以下ＣＳＦと略）を処
理前の古紙パルプより５０〜２５０ｍｌ、好ましくは８
０〜２００ｍｌ上昇させることが必要である。ＣＳＦの
上昇が５０ｍｌ未満では、灰分の除去が不十分であり、
微細繊維状セルロース物質の添加効果発現が不十分とな
る。また、ＣＳＦの上昇が２５０ｍｌより大きくなる
と、いわゆるパルプ歩留りの低下が大きくなり、経済的
ではない。According to the production method of the present invention, in the waste paper pulp production process, first, waste paper pulp is diluted with a large amount of water and classified by a known method. The classification conditions are not particularly limited, but it is desirable to dilute the pulp to a concentration of 1.5% or less and then provide the diluted pulp to a classification device. By this classification treatment, the waste paper pulp has a long fiber fraction rich in long fibers, fine fibers,
Short fiber fraction rich in ash (internal filler, pigment derived from coated paper coating layer) is classified. In order to exhibit the paper strength improving effect by blending the microfibrillated fibers, the Canadian standard freeness (hereinafter abbreviated to CSF) of the long fiber fraction is 50 to 250 ml, preferably 8 to 50 ml, from the waste paper pulp before treatment.
It is necessary to raise 0-200 ml. If the CSF rise is less than 50 ml, ash removal is insufficient,
The effect of adding the fine fibrous cellulosic material becomes insufficient. On the other hand, if the rise in CSF is larger than 250 ml, the so-called pulp yield is greatly reduced, which is not economical.
【０００８】ミクロフィブリル化繊維としては、原料、
製法は特に制限されないが、その配合により紙力向上効
果が発現するためには、フィブリル化が高度に進行して
いることが必要である。具体的には、カナダ標準濾水度
で１２０ｍｌ以下、もしくは、JAPAN TAPPI No.26-78
に規定される保水度が３００％以上である。このような
ミクロフイブリル化繊維の製法としては、特開平７−２
２９０８２号に記載されるように、セルロースパルプス
ラリーを振動型粉砕装置などにより衝撃、摩擦、剪断等
の力を与えて粉砕したものが挙げられる。また、特開平
８−１０９５９１号に記載されるように、木材パルプを
高度に粘状叩解したものも好ましく使用できる。[0008] Microfibrillated fibers include raw materials,
Although the production method is not particularly limited, it is necessary that fibrillation be advanced to a high degree in order to achieve a paper strength improving effect by its blending. Specifically, the standard freeness of Canada is 120 ml or less, or JAPAN TAPPI No. 26-78
Is 300% or more. A method for producing such microfibrillated fibers is disclosed in
As described in Japanese Patent No. 29082, a cellulose pulp slurry obtained by pulverizing a cellulose pulp slurry by applying a force such as impact, friction, or shearing with a vibration type pulverizer or the like may be used. Further, as described in JP-A-8-109591, wood pulp obtained by highly viscous beating can be preferably used.
【０００９】長繊維フラクションに対するミクロフィブ
リル化繊維の配合量は、フィブリル化の程度にもよる
が、抄紙時の濾水性低下の問題から１〜１０重量％であ
る。ミクロフィブリル化繊維の配合位置としては特に制
限はなく、分級処理後の長繊維フラクションに配合して
も、長繊維フラクションを他のパルプに配合した後でも
良い。The amount of the microfibrillated fiber relative to the long fiber fraction depends on the degree of fibrillation, but is 1 to 10% by weight due to the problem of reduced drainage during papermaking. The blending position of the microfibrillated fibers is not particularly limited, and may be blended in the long fiber fraction after the classification treatment or after blending the long fiber fraction in another pulp.
【００１０】本発明を使用して製造される紙としては米
坪３０〜１００g/m2の包装紙、印刷紙、事務用紙などの
洋紙、米坪１００g/m2以上の板紙、多層抄板紙きであ
る。多層抄き板紙は少なくとも表層、中層、裏層の３層
以上からなり、５〜９層構造が普通である。本発明を多
層抄き板紙に適用する場合は、表層または裏層、即ち、
最外層に適用することが好ましい。実施例に示すよう
に、本発明による紙力向上効果は特に耐折強度において
顕著であり、耐折れ適性を要求される板紙においては最
外層の耐折強度アップが重要なためである。最外層に用
いる古紙パルプを洗浄処理して生じる微細繊維、灰分を
含む洗浄濾液は中層に配合することにより有効利用が図
られる。[0010] The present invention basis weight 30~100g / m 2 of wrapping paper as the paper to be manufactured using, printing paper, foreign paper-out, basis weight 100g / m 2 or more of paperboard, multi-layer抄板paper such as office paper It is. The multilayer paperboard is composed of at least three layers, a surface layer, a middle layer, and a back layer, and usually has a 5- to 9-layer structure. When the present invention is applied to a multilayer paperboard, a surface layer or a back layer, that is,
It is preferable to apply to the outermost layer. As shown in the Examples, the effect of improving the paper strength according to the present invention is particularly remarkable in the bending strength, and it is important to increase the bending strength of the outermost layer in the paperboard required to have the bending resistance. The washing filtrate containing fine fibers and ash generated by washing the used paper pulp used for the outermost layer is mixed with the middle layer for effective use.
【００１１】本発明の対象となる紙、板紙における古紙
パルプ配合量は以下の通りである。即ち、紙の場合、５
０〜１００％である。板紙の場合、裏層に５０〜１００
％含むもので、他の表層、表下層、中層については特に
制限はない。いずれの場合も、古紙パルプは脱墨したパ
ルプ、脱墨していないパルプを含んでもよい。The amounts of waste paper pulp in the paper and paperboard to which the present invention is applied are as follows. That is, in the case of paper, 5
0 to 100%. In the case of paperboard, 50-100
%, And there is no particular limitation on the other surface layer, lower layer, and middle layer. In any case, the wastepaper pulp may include deinked pulp and undeinked pulp.
【００１２】[0012]
【実施例】本発明を実施例によりさらに詳細に説明する
が、本発明は実施例にかぎられるものではない。 ＜実施例＞古紙パルプとして、雑誌100%の古紙を離解し
パルプＡを得て、これを目標フリーネスに応じて希釈し
十分撹拌した後、150メッシュふるいでパルプ濃度10%に
濃縮し、微細繊維および灰分を洗浄除去し、長繊維フラ
クション（Ｌ．Ｆ．と略）であるパルプＢ、Ｃ、Ｄを得
た。表１に各パルプのＣＳＦ、歩留り、シートの物性値
を示す。なお、シートの米坪は６０g/m2である。EXAMPLES The present invention will be described in more detail with reference to examples, but the present invention is not limited to the examples. <Example> As waste paper pulp, pulp A was obtained by disintegrating 100% of waste paper from a magazine, and was diluted according to the target freeness and sufficiently stirred. The ash was removed by washing to obtain pulp B, C, and D as long fiber fractions (abbreviated as LF). Table 1 shows the CSF, yield, and physical properties of each pulp. In addition, the rice tsubo of the sheet is 60 g / m 2 .
【００１３】[0013]
【表１】 [Table 1]
【００１４】本実施例で使用するミクロフィブリル化繊
維（Ｍ．Ｆ．Ｆ．と略）を表２．に示すTable 2 shows the microfibrillated fibers (abbreviated as MFF) used in this example. Shown in
【００１５】[0015]
【表２】 [Table 2]
【００１６】表３に示す割合でパルプとＭ．Ｆ．Ｆ．を
配合し、配合後の物性値も併せて表３に記載した。ま
た、表４にはシートの物性値を記載した。The pulp and M.P. F. F. And the physical properties after compounding are also shown in Table 3. Table 4 shows the physical property values of the sheet.
【００１７】[0017]
【表３】 [Table 3]
【００１８】[0018]
【表４】 [Table 4]
【００１９】各種測定値は以下により測定した。 裂断長 ＪＩＳ Ｐ８１１３ 耐折強度 ＪＩＳ Ｐ８１１５ ただしＭＩＴ試験器 荷重０．５ｋｇｆ 灰分 ＪＩＳ Ｐ８１２８ ただし最高温度５００℃Various measured values were measured as follows. Break length JIS P8113 Folding strength JIS P8115 MIT tester Load 0.5kgf Ash JIS P8128 However, Maximum temperature 500 ℃
【００２０】表１に示すように、分級処理前のパルプ
Ａ、分級処理後の長繊維フラクションＢ、Ｃ、Ｄから得
られるシートの強度はほぼ同等である。これらにミクロ
フィブリル化繊維を配合して得られるシートの強度は、
配合なしのシート強度より向上するが、分級処理なし
（比較例１）、分級処理前後のＣＳＦの上昇幅が５０ｍ
ｌ未満（比較例２）では、その向上率が十分とは言えな
い。灰分の存在がミクロフィブリル化繊維の紙力向上効
果を阻害しているためである。また、濾水時間も長い。
これに対して、分級処理前後のＣＳＦ上昇幅が５０ｍｌ
以上の長繊維フラクションを用いた実施例１，２，３で
は、濾水時間は分級処理前よりも短いながらも十分な紙
力向上効果が認められる。ただし、ＣＳＦの上昇幅が大
きくなるに従い、パルプ歩留まりが低下する。したがっ
て、ミクロフィブリル化繊維配合に先立つ古紙パルプの
分級処理おいては、その配合効果とパルプ歩留りの観点
から、処理前後のＣＳＦ上昇幅は５０〜２５０ｍｌ、好
ましくは８０〜２００ｍｌである。以上のように、古紙
パルプに対するミクロフィブリル化繊維の配合に際して
紙力発現効果と濾水性を両立させるためには、添加に先
立つ古紙パルプの分級処理が不可欠である。As shown in Table 1, the sheets obtained from the pulp A before the classification and the long fiber fractions B, C and D after the classification have almost the same strength. The strength of the sheet obtained by blending the microfibrillated fibers with these,
Although the sheet strength is higher than the sheet strength without the compounding, the classifying treatment is not performed (Comparative Example 1).
If it is less than 1 (Comparative Example 2), the improvement rate cannot be said to be sufficient. This is because the presence of ash inhibits the paper strength improving effect of the microfibrillated fibers. Also, the drainage time is long.
In contrast, the CSF rise before and after the classification process is 50 ml
In Examples 1, 2 and 3 using the above long fiber fraction, a sufficient paper strength improving effect is recognized although the drainage time is shorter than before the classification treatment. However, the pulp yield decreases as the increase in the CSF increases. Therefore, in the classification treatment of waste paper pulp prior to the blending of the microfibrillated fibers, the CSF increase before and after the treatment is 50 to 250 ml, preferably 80 to 200 ml, from the viewpoint of the blending effect and the pulp yield. As described above, classification of waste paper pulp prior to addition is indispensable in order to achieve both a paper strength development effect and drainage when blending microfibrillated fibers with waste paper pulp.
【００２１】[0021]
【発明の効果】本発明によれば、原料パルプとして強度
がでにくい古紙パルプの紙力向上方法として公知のミク
ロフィブリル化繊維を配合する場合、古紙パルプに分級
処理を施した後、ミクロフィブリル化繊維を配合するこ
とで、紙力向上効果と抄紙機における濾水性を両立させ
ることができる。また、特に耐折強度が向上するので、
板紙の外層に使用すれば表面割れの防止に役立つ。According to the present invention, when blending microfibrillated fibers known as a method for improving the strength of waste paper pulp having low strength as a raw material pulp, the waste paper pulp is subjected to a classification treatment and then to microfibrillation. By blending the fibers, it is possible to achieve both a paper strength improving effect and drainage in a paper machine. Also, since the bending strength is particularly improved,
Use for the outer layer of paperboard helps prevent surface cracking.
Claims (3)
クションを除去して長繊維フラクションを得た後、該長
繊維フラクションにミクロフィブリル化繊維を配合する
ことを特徴とする古紙パルプの製造方法。1. A method for producing waste paper pulp, comprising subjecting waste paper pulp to a classification treatment to remove short fiber fractions to obtain long fiber fractions, and then mixing microfibrillated fibers with the long fiber fractions.
理前の古紙パルプと処理後の長繊維フラクションのカナ
ダ標準濾水度の差が、５０〜２５０ｍｌ、好ましくは８
０〜２００ｍｌであることを特徴とする紙および古紙パ
ルプの製造方法。2. The classification process according to claim 1, wherein the difference between the Canadian standard freeness of the waste paper pulp before the treatment and the long fiber fraction after the treatment is 50 to 250 ml, preferably 8 or less.
A method for producing paper and wastepaper pulp, which is 0 to 200 ml.
ィブリル化繊維を１〜１０重量％配合することを特徴と
する請求項１または請求項２に記載の古紙パルプ製造方
法。3. The method for producing waste paper pulp according to claim 1, wherein 1 to 10% by weight of the microfibrillated fiber is blended with respect to the long fiber fraction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9346097A JPH10292281A (en) | 1997-04-11 | 1997-04-11 | Production of wastepaper pulp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9346097A JPH10292281A (en) | 1997-04-11 | 1997-04-11 | Production of wastepaper pulp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10292281A true JPH10292281A (en) | 1998-11-04 |
Family
ID=14082955
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9346097A Pending JPH10292281A (en) | 1997-04-11 | 1997-04-11 | Production of wastepaper pulp |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10292281A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010513741A (en) * | 2006-12-18 | 2010-04-30 | アクゾ ノーベル ナムローゼ フェンノートシャップ | Method for manufacturing paper products |
| JP2011524476A (en) * | 2008-06-17 | 2011-09-01 | アクゾ ノーベル ナムローゼ フェンノートシャップ | Cellulose products |
| JP2013510249A (en) * | 2009-11-06 | 2013-03-21 | ストラ エンソ オーワイジェイ | Methods for producing paper or paperboard products and paper or paperboard produced according to these methods |
| JP2020059936A (en) * | 2018-10-05 | 2020-04-16 | 大王製紙株式会社 | Slurry of cellulose fibers |
| CN114059377A (en) * | 2021-11-23 | 2022-02-18 | 山鹰国际控股股份公司 | Method for producing cardboard paper by using waste paper pulp |
-
1997
- 1997-04-11 JP JP9346097A patent/JPH10292281A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010513741A (en) * | 2006-12-18 | 2010-04-30 | アクゾ ノーベル ナムローゼ フェンノートシャップ | Method for manufacturing paper products |
| JP2011524476A (en) * | 2008-06-17 | 2011-09-01 | アクゾ ノーベル ナムローゼ フェンノートシャップ | Cellulose products |
| US8388808B2 (en) | 2008-06-17 | 2013-03-05 | Akzo Nobel N.V. | Cellulosic product |
| JP2013510249A (en) * | 2009-11-06 | 2013-03-21 | ストラ エンソ オーワイジェイ | Methods for producing paper or paperboard products and paper or paperboard produced according to these methods |
| US9175441B2 (en) | 2009-11-06 | 2015-11-03 | Stora Enso Oyj | Process for the production of a paper or board product and a paper or board produced according to the process |
| JP2020059936A (en) * | 2018-10-05 | 2020-04-16 | 大王製紙株式会社 | Slurry of cellulose fibers |
| CN114059377A (en) * | 2021-11-23 | 2022-02-18 | 山鹰国际控股股份公司 | Method for producing cardboard paper by using waste paper pulp |
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