DE4112483A1 - METHOD FOR TREATING WASTE PAPER - Google Patents
METHOD FOR TREATING WASTE PAPERInfo
- Publication number
- DE4112483A1 DE4112483A1 DE19914112483 DE4112483A DE4112483A1 DE 4112483 A1 DE4112483 A1 DE 4112483A1 DE 19914112483 DE19914112483 DE 19914112483 DE 4112483 A DE4112483 A DE 4112483A DE 4112483 A1 DE4112483 A1 DE 4112483A1
- Authority
- DE
- Germany
- Prior art keywords
- waste paper
- salts
- polyvinyl alcohol
- copolymer
- aid according
- 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.)
- Ceased
Links
- 239000010893 paper waste Substances 0.000 title claims description 17
- 238000000034 method Methods 0.000 title claims description 14
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 13
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 13
- 229940068984 polyvinyl alcohol Drugs 0.000 claims description 13
- 235000019422 polyvinyl alcohol Nutrition 0.000 claims description 13
- 229920001577 copolymer Polymers 0.000 claims description 11
- 150000002148 esters Chemical class 0.000 claims description 11
- 239000002761 deinking Substances 0.000 claims description 6
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 4
- 238000005188 flotation Methods 0.000 claims description 4
- 230000007062 hydrolysis Effects 0.000 claims description 3
- 238000006460 hydrolysis reaction Methods 0.000 claims description 3
- 239000007844 bleaching agent Substances 0.000 claims description 2
- 239000008139 complexing agent Substances 0.000 claims description 2
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 2
- 239000002270 dispersing agent Substances 0.000 claims description 2
- 239000000194 fatty acid Substances 0.000 claims description 2
- 229930195729 fatty acid Natural products 0.000 claims description 2
- 150000004665 fatty acids Chemical class 0.000 claims description 2
- 235000019353 potassium silicate Nutrition 0.000 claims description 2
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 2
- 238000005406 washing Methods 0.000 claims description 2
- 150000003839 salts Chemical class 0.000 claims 5
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 claims 1
- QPCDCPDFJACHGM-UHFFFAOYSA-N N,N-bis{2-[bis(carboxymethyl)amino]ethyl}glycine Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(=O)O)CCN(CC(O)=O)CC(O)=O QPCDCPDFJACHGM-UHFFFAOYSA-N 0.000 claims 1
- KFSLWBXXFJQRDL-UHFFFAOYSA-N Peracetic acid Chemical compound CC(=O)OO KFSLWBXXFJQRDL-UHFFFAOYSA-N 0.000 claims 1
- 239000002253 acid Substances 0.000 claims 1
- 125000005210 alkyl ammonium group Chemical group 0.000 claims 1
- 239000003599 detergent Substances 0.000 claims 1
- 229960003330 pentetic acid Drugs 0.000 claims 1
- PFUVRDFDKPNGAV-UHFFFAOYSA-N sodium peroxide Chemical compound [Na+].[Na+].[O-][O-] PFUVRDFDKPNGAV-UHFFFAOYSA-N 0.000 claims 1
- 239000004094 surface-active agent Substances 0.000 claims 1
- 239000000976 ink Substances 0.000 description 10
- 239000000123 paper Substances 0.000 description 10
- 239000000126 substance Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 229920000642 polymer Polymers 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 2
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 150000002978 peroxides Chemical class 0.000 description 2
- 239000000049 pigment Substances 0.000 description 2
- 239000000344 soap Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 229920003043 Cellulose fiber Polymers 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 1
- 241001296096 Probles Species 0.000 description 1
- GOOHAUXETOMSMM-UHFFFAOYSA-N Propylene oxide Chemical compound CC1CO1 GOOHAUXETOMSMM-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 125000005396 acrylic acid ester group Chemical group 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 150000003868 ammonium compounds Chemical class 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 238000004042 decolorization Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000001584 effect on egg Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000008396 flotation agent Substances 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 238000010559 graft polymerization reaction Methods 0.000 description 1
- 239000011084 greaseproof paper Substances 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- PZYDAVFRVJXFHS-UHFFFAOYSA-N n-cyclohexyl-2-pyrrolidone Chemical compound O=C1CCCN1C1CCCCC1 PZYDAVFRVJXFHS-UHFFFAOYSA-N 0.000 description 1
- 238000009896 oxidative bleaching Methods 0.000 description 1
- 238000010979 pH adjustment Methods 0.000 description 1
- 239000011087 paperboard Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- 150000003077 polyols Chemical class 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 235000011121 sodium hydroxide Nutrition 0.000 description 1
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Substances [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
- D21C5/02—Working-up waste paper
- D21C5/025—De-inking
- D21C5/027—Chemicals therefor
-
- 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
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Toxicology (AREA)
- Paper (AREA)
Description
Gegenstand der vorliegenden Erfindung sind Verfahren zur Druck farbenentfernung aus Altpapier durch Zusatz von Copolymeren des Polyvinylalkohols oder dessen wasserlöslichen teilhydrolysier ten Estern, die Verwendung von Copolymeren des Polyvinylalko hols oder dessen wasserlöslichen teilhydrolysierten Estern bei der Druckfarbenentfernung aus Altpapier sowie Hilfsmittel zur Unterstützung der Druckfarbenentfernung aus Altpapier, enthal tend Copolymere des Polyvinylalkohols oder dessen wasserlösli che teilhydrolysierte Ester.The present invention relates to processes for printing color removal from waste paper by adding copolymers of Polyvinyl alcohol or its water-soluble partially hydrolyzed ten esters, the use of copolymers of polyvinyl alcohol hols or its water-soluble partially hydrolyzed esters the removal of printing ink from waste paper and tools for Support for ink removal from waste paper, included tend copolymers of polyvinyl alcohol or its water-soluble partially hydrolyzed esters.
Kein Bereich der für die Papierherstellung notwendigen Roh- bzw. Halbstofferzeugung hat in den letzten Jahrzehnten eine so stürmische und anhaltende Aufwärtsentwicklung erlebt wie die Altpapieraufbereitung. Die Wiederverwertung von Altpapier, die in einigen hochentwickelten Ländern bereits knapp 50% des ge samten Fasereintrages ausmacht, stellt, neben wirtschaftlichen Einsparungen, durch ideale Kombination des Entsorgungsproblems mit dem Prinzip der bestmöglichen Reststoffverwertung unter Berücksichtigung der Energieeinsparung einen bedeutenden Bei trag zum Umweltschutz und zur Ressourcenschonung dar.No area of raw materials required for paper production or the production of semi-finished goods has been such in recent decades experienced stormy and sustained upward development like that Waste paper processing. The recycling of waste paper, the in some highly developed countries almost 50% of the ge makes up all of the fiber entry, alongside economic Savings through the ideal combination of the disposal problem with the principle of the best possible recycling of waste Consideration of energy saving a significant contribution represents environmental protection and resource conservation.
Unter Deinking versteht man einen Altpapieraufbereitungsprozeß zur Druckfarbenentfernung, der besonders auf bessere und mitt lere Altpapiersorten ausgerichtet ist. Deinkte Altpapiere (Regeneratstoffe) werden z. B. bei Zeitungsdruck, Hygienekrepp, Tapetenrohpapier und Faltschachtelkarton eingesetzt, um Zell stoffe ganz oder teilweise zu ersetzen (Papiermachertaschenbuch Dr. Curt Haefner Verlag Heidelberg, 5. Auflage, 1989, S.104). Als Verfahren zur Druckfarbenentfernung kommt hierbei in Europa üblicherweise das Flotationsdeinking zum Einsatz, während in USA und Kanada noch überwiegend das stärker wasserverbrauchende Waschdeinking durchgeführt wird. Deinking is a waste paper processing process for ink removal, especially on better and medium other types of waste paper. Deinked waste paper (Regenerate substances) z. B. in newspaper printing, hygienic crepe, Wallpaper base paper and folding boxboard used to cell to replace all or part of the fabric (paper maker paperback Dr. Curt Haefner Verlag Heidelberg, 5th edition, 1989, p.104). As Process for ink removal comes here in Europe Usually flotation thinking is used while in The USA and Canada still predominantly use more water Washing dinning is carried out.
Einem weiteren Anstieg der Recyclingquote steht, neben Proble men mit der Erfassung von gut sortiertem Altpapier und einem Abfall in den Festigkeitswerten recyclierter Fasern, vor allem auch das Problem des Verlustes an Helligkeit trotz verbesserter Deinking-Technologie im Wege. Während sich nämlich die maschi nenbauliche Seite der Deinking-Technologie durch veränderte Auflöser und Auflösebedingungen sowie weiterentwickelte Flota tionszellen verbesserte, wird im chemischen Bereich der Dein king-Technologie noch immer fast unverändert die gleiche Rezep tur wie vor 10-20 Jahren verwendet.A further increase in the recycling rate stands alongside Proble with the collection of well sorted waste paper and a Decrease in the strength values of recycled fibers, especially also the problem of loss of brightness despite improved Deinking technology in the way. While the maschi structural side of deinking technology through changed Dissolver and dissolution conditions as well as further developed flota tion cells, will become yours in the chemical field king technology still almost unchanged the same recipe tur as used 10-20 years ago.
Nach dem Stand der Technik werden dem zu deinkenden Stoff meist bereits im Pulper die folgenden Chemikalien zugegeben: Natron lauge zur pH-Wert-Einstellung auf 10-11, Wasserstoffperoxid als Löser für Druckfarben und Bleichmittel, Wasserglas als Löser für Druckfarben und Stabilisator für die oxidative Bleiche mit Peroxid, Seife oder Fettsäure als Schmutzsammler, Schaumbildner und Flotationsmittel, sowie in einigen Fällen auch noch organi sche Komplexbildner zur Peroxidstabilisierung. Die Gesamtmenge an Chemikalien beträgt üblicherweise 4-8%, bezogen auf otro Stoff (Papiermachertaschenbuch, Dr. Curt Haefner Verlag Heidel berg, 5. Auflage, 1989, S.104).According to the state of the art, the material to be deinked is mostly already added the following chemicals in the pulper: baking soda lye for pH adjustment to 10-11, hydrogen peroxide as Solvent for printing inks and bleach, water glass as a solvent for printing inks and stabilizer for oxidative bleaching with Peroxide, soap or fatty acid as dirt collectors, foaming agents and flotation agents, as well as organi in some cases cal complexing agent for peroxide stabilization. The total amount of chemicals is usually 4-8%, based on otro Fabric (paper maker paperback, Dr. Curt Haefner Verlag Heidel berg, 5th edition, 1989, p.104).
In FR 13 79 252 und USP 33 77 234 wird der Zusatz von oberflächenaktiven Substanzen zur Stoffmischung vor dem Pulper beschrieben, von teil- oder vollverseiften Estern des Polyvi nylalkohols wird nicht ausgegangen.In FR 13 79 252 and USP 33 77 234 the addition of surface-active substances for the mixture of substances in front of the pulper described, from partially or fully hydrolyzed esters of Polyvi nyl alcohol is not going out.
USP 40 13 505 und USP 41 47 616 beschreiben die Methode der Präzipitation von Calciumseifen im Pulper, mit anschließender Abtrennung der adsorbierten Druckfarbe durch Zentrifugaltren nung.USP 40 13 505 and USP 41 47 616 describe the method of Precipitation of calcium soaps in the pulper, with subsequent Separation of the adsorbed printing ink by centrifugal separators nung.
USP 38 46 227 und USP 39 63 560 beschreiben die Verwendung von N- Cyclohexylpyrrolidon als Lösungsmittel im Pulper, um die Ablö sung der Druckfarbe zu verbessern. Als Nachteile sind hierbei vor allem der ökologisch unvertretbare Lösungsmittelverlust des Gesamtsystems zu nennen. USP 38 46 227 and USP 39 63 560 describe the use of N- Cyclohexylpyrrolidone as solvent in the pulper to the Ablö solution to improve the printing ink. The disadvantages here are especially the ecologically unacceptable loss of solvent Overall system.
In EP 1 63 444 wird dem Altpapier im Pulper ein bei Zimmertemperatur vulkanisierbares Harz zugesetzt, und dieses in situ vernetzt. Hierbei wird angenommen, daß die Wirkung auf ei ner Umhüllung der Pigmentteilchen mit dem vernetzten Harz und dadurch einer verringerten Redeposition an der Cellulosefaser beruht. Als Dispergator für die relativ hydrophobe Harzvorstufe wird u. a. auch Polyvinylalkohol empfohlen. In ähnlicher Weise geht GB 20 80 354 vom Zusatz von Polymeren oberhalb ihres Erwei chungspunktes aus.In EP 1 63 444 the waste paper is added to the pulper Room temperature vulcanizable resin added, and this in networked in situ. Here it is assumed that the effect on egg ner coating of the pigment particles with the crosslinked resin and thereby a reduced speech position on the cellulose fiber is based. As a dispersant for the relatively hydrophobic resin precursor we you. a. polyvinyl alcohol is also recommended. In a similar way GB 20 80 354 goes from adding polymers above their expanse point.
Ziel der vorliegenden Erfindung war es, Chemikalien zu entwic keln oder aufzufinden, welche bei möglichst weitgehender Unbedenklichkeit für das Ökosystem zu einer deutlichen Steige rung des erzielbaren Weißgrades bei der Druckfarbenentfernung aus Altpapier führen und damit einen erweiterten Einsatz von Recyclingfasern im Bereich der Herstellung höherwertiger Pa piere ermöglichen.The aim of the present invention was to develop chemicals or find out which one is as extensive as possible Harmlessness for the ecosystem to a significant increase tion of the achievable degree of whiteness in the ink removal lead from waste paper and thus an extended use of Recycled fibers in the area of the production of higher quality Pa enable piere.
Überraschenderweise wurde nun gefunden, daß Copolymere des Polyvinylalkohols oder dessen wasserlösliche teilhydrolysierte Ester in geradezu idealer Weise diese Anforderungen erfüllen. Dies ist umso überraschender, da diese bereits seit langem be kannte und vielseitig, beispielsweise als Bindemittel für die Oberflächenleimung, als Pigmentbindemittel und Schutzkolloid für die Herstellung von Streichmassen, bei der Herstellung von Silicon-Papieren, Mitläufer-Trennpapieren, fettdichten Papie ren, Selbstdurchschreibepapieren und elektrographischen Papie ren sowie zur Erhöhung der Falzfestigkeit von Banknoten- und Landkartenpapieren in der Papierherstellung verwendete Pro duktgruppe bei falscher Dosierung zu einer deutlichen Ver schlechterung der Ergebnisse führen kann. So kommt es bei man chen Produkten bei zu niederer oder zu hoher Dosierung zu einem deutlichen Abfall des resultierenden Weißgrades. Dies ent spricht auch den nach dem Stand der Technik erwartungsgemäß für die Druckfarbenentfernung negativen Eigenschaften derartiger Bindemitteln.Surprisingly, it has now been found that copolymers of Polyvinyl alcohol or its water-soluble partially hydrolyzed Esters ideally meet these requirements. This is all the more surprising since it has been around for a long time known and versatile, for example as a binder for the Surface sizing, as a pigment binder and protective colloid for the production of coating slips, in the production of Silicon papers, idler release papers, greaseproof papers carbonless papers and electrographic papers ren and to increase the fold strength of banknotes and Pro paper used in paper making Product group with incorrect dosage to a clear ver deterioration in results. So it happens with man products at too low or too high a dosage significant drop in the resulting whiteness. This ent also, as expected, speaks for the state of the art the ink removal negative properties of such Binders.
Copolymere im Sinne der Erfindung sind alle Formen von Polyme ren, bei den im Endprodukt, neben anderen Polymerstrukturen, Elemente der Struktur -CH2-CH(OH)- aufzufinden sind. Bevorzugte Ausgangsmonomere zur Copolymerisation sind beispielsweise Acryl säureester bzw. deren Hydrolyseprodukte sowie Butadien. Darüberhinaus können die Hydroxylgruppen des entstandenen Poly ols auch nach dem Stand der Technik durch Propfpolymerisation, vorzugsweise mittels epoxidhaltiger Verbindungen wie beispiels weise Ethylenoxid oder Propylenoxid, zusätzlich zur Reaktion gebracht worden sein. Auf diese Weise können beispielsweise auch anionische oder kationische Gruppierungen, vorzugsweise Cor boxylgruppen oder Ammoniumverbindungen, in das Polymer einge führt worden sein.Copolymers in the sense of the invention are all forms of polymers in which, in addition to other polymer structures, elements of the structure -CH 2 -CH (OH) - can be found in the end product. Preferred starting monomers for copolymerization are, for example, acrylic acid esters or their hydrolysis products and butadiene. In addition, the hydroxyl groups of the polyol formed can also be brought to the reaction in the prior art by graft polymerization, preferably by means of epoxy-containing compounds such as ethylene oxide or propylene oxide. In this way, for example, anionic or cationic groups, preferably cor boxyl groups or ammonium compounds, may have been introduced into the polymer.
Es wurde auch gefunden, daß die gefundene positive Wirkung der Copolymeren des Polyvinylalkohols bzw. teilhydrolysierten Ester des Polyvinylalkohols sowohl im Pulper als auch bei der Flota tion festzustellen ist.It has also been found that the found positive effect of Copolymers of polyvinyl alcohol or partially hydrolyzed esters of polyvinyl alcohol both in the pulper and in the flota tion.
Claims (12)
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4110379A DE4110379C2 (en) | 1991-03-28 | 1991-03-28 | Method and means for ink removal from waste paper |
| DE19914112483 DE4112483A1 (en) | 1991-03-28 | 1991-04-17 | METHOD FOR TREATING WASTE PAPER |
| EP92907491A EP0576529A1 (en) | 1991-03-28 | 1992-03-25 | Process for removing printing ink from waste paper |
| PCT/EP1992/000666 WO1992017638A1 (en) | 1991-03-28 | 1992-03-25 | Process for removing printing ink from waste paper |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4110379A DE4110379C2 (en) | 1991-03-28 | 1991-03-28 | Method and means for ink removal from waste paper |
| DE19914112483 DE4112483A1 (en) | 1991-03-28 | 1991-04-17 | METHOD FOR TREATING WASTE PAPER |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE4112483A1 true DE4112483A1 (en) | 1992-12-10 |
Family
ID=25902379
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE4110379A Expired - Fee Related DE4110379C2 (en) | 1991-03-28 | 1991-03-28 | Method and means for ink removal from waste paper |
| DE19914112483 Ceased DE4112483A1 (en) | 1991-03-28 | 1991-04-17 | METHOD FOR TREATING WASTE PAPER |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE4110379A Expired - Fee Related DE4110379C2 (en) | 1991-03-28 | 1991-03-28 | Method and means for ink removal from waste paper |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0576529A1 (en) |
| DE (2) | DE4110379C2 (en) |
| WO (1) | WO1992017638A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3051341B2 (en) | 1996-06-17 | 2000-06-12 | 日本合成化学工業株式会社 | Deinking agent |
| CN103266522B (en) * | 2013-05-27 | 2015-10-28 | 华南理工大学 | A kind of method for bleaching of waste paper pulp |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL282377A (en) * | 1961-08-22 | 1900-01-01 | ||
| GB1003646A (en) * | 1962-10-31 | 1965-09-08 | Petrolite Corp | Improved deinking process |
| FR1379252A (en) * | 1963-09-05 | 1964-11-20 | Garden State Paper Company | Process for removing ink from waste printed cellulosic materials |
| US3764460A (en) * | 1969-04-01 | 1973-10-09 | Japan Maize Products Co Ltd | Process of deinking waste paper materials |
| US4147616A (en) * | 1972-03-09 | 1979-04-03 | Vyskumny Ustav Papieru A Celulosy Of Bratislava | Apparatus for deinking printed wastepapers |
| US4013505A (en) * | 1972-03-09 | 1977-03-22 | Vyzkumny Ustav Papieru A Celulosy | Method of deinking printed wastepapers |
| US3963560A (en) * | 1972-11-01 | 1976-06-15 | Gaf Corporation | Composition for deinking waste paper |
| US3846227A (en) * | 1972-11-01 | 1974-11-05 | Gaf Corp | Deinking of waste paper with an aqueous solution containing an n-alkyllactam solvent |
| WO1980001085A1 (en) * | 1978-11-28 | 1980-05-29 | Univ Surrey | A process for de-inking paper pulp |
| CA1249903A (en) * | 1984-05-10 | 1989-02-14 | Christopher C. Mollett | Composition and method of deinking of recycled cellulosic material |
| US4886575A (en) * | 1985-10-08 | 1989-12-12 | Betz Laboratories, Inc. | Detackification of adhesive materials contained in secondary fiber with polyvinyl alcohol |
| CA1339231C (en) * | 1989-03-30 | 1997-08-05 | Ratana Kanluen | Polyfunctional polymers as deinking agents |
-
1991
- 1991-03-28 DE DE4110379A patent/DE4110379C2/en not_active Expired - Fee Related
- 1991-04-17 DE DE19914112483 patent/DE4112483A1/en not_active Ceased
-
1992
- 1992-03-25 EP EP92907491A patent/EP0576529A1/en not_active Ceased
- 1992-03-25 WO PCT/EP1992/000666 patent/WO1992017638A1/en not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| DE4110379C2 (en) | 1994-03-31 |
| DE4110379A1 (en) | 1992-10-01 |
| WO1992017638A1 (en) | 1992-10-15 |
| EP0576529A1 (en) | 1994-01-05 |
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