EP0014753A1 - Process for improving the colour and for the deodorisation of sulphate pulp - Google Patents
Process for improving the colour and for the deodorisation of sulphate pulp Download PDFInfo
- Publication number
- EP0014753A1 EP0014753A1 EP79104899A EP79104899A EP0014753A1 EP 0014753 A1 EP0014753 A1 EP 0014753A1 EP 79104899 A EP79104899 A EP 79104899A EP 79104899 A EP79104899 A EP 79104899A EP 0014753 A1 EP0014753 A1 EP 0014753A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pulp
- peroxide
- sulfate
- kraft
- deodorisation
- 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.)
- Granted
Links
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
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/10—Bleaching ; Apparatus therefor
- D21C9/16—Bleaching ; Apparatus therefor with per compounds
- D21C9/163—Bleaching ; Apparatus therefor with per compounds with peroxides
Definitions
- Pulp which was produced by the Kraft or sulfate process, are characterized by excellent technological properties. After bleaching, they are used in large quantities for paper production.
- the fuel or sulfate pulp In the unbleached state, the fuel or sulfate pulp is used in a not inconsiderable amount for the production of packaging materials, e.g. Cardboard boxes used. Because of its very high strength properties, the kraft or sulfate pulp is particularly suitable for packaging in which heavy mechanical stress must be expected.
- the unbleached kraft or sulfate pulp has significant disadvantages which undesirably severely limit its use for the production of packaging material.
- sulphate cooking produces intensely smelling sulfur-containing compounds, e.g. Ethyl and methyl mercaptan, which give the kraft or sulfate pulp a characteristic smell and cannot be removed with sufficient certainty during washing and drying.
- sulfur-containing compounds e.g. Ethyl and methyl mercaptan
- These properties of the fuel or sulfate pulp have a particularly disadvantageous effect on food packaging, so that hitherto the unbleached fuel or sulfate pulp has been used for this purpose, e.g. for milk packaging, is not possible.
- the invention relates to a process for lightening and deodorising fuel or sulfate pulp, which is characterized in that after the sulfate boil during stock preparation in the area of a diffusion wash using the residual alkalinity of the pulp suspension still present in the pulp after the alkaline boil a peroxide in an amount of 0, 05-3 Gev .-% (based on 100% peroxide), based on absolutely dry pulp, is added.
- Hydrogen peroxide in aqueous solution is preferably used as the peroxide.
- the residual alkalinity of the cellulose suspension at the beginning of the addition of the peroxide can correspond to a degree of leaching of from 0.2 to 1.8% by weight of Na 2 SO 4 , preferably from 1.2 to 1.5% by weight of Na 2 SO 4 .
- the process according to the invention can be carried out at material densities in the range from 3 to 20% by weight and at temperatures in the range from 4o to 90 ° C.
- a temperature of 6o to 70 ° C is special advantageous.
- the storage time of the pulp can moreover be between 1 to 25 hours and in an advantageous embodiment 7 to 15 hours.
- the peroxide consumption is too rapid and the result is poor.
- Inorganic or organic acids which do not contain reducing components can be used as the acid.
- Sulfuric acid can advantageously be used.
- the process according to the invention is surprisingly possible in the phase of the kraft or sulfate pulp production process described, although known formulations for pulp bleaching with peroxide do not achieve adequate results in this phase of the pulp production process. It: therefore there is a generally held opinion that remaining from the cooking, not washed oxidizable shares to premature peroxide led and made a bleach impossible.
- peroxide bleaching is possible in the described phase of the kraft or sulfate pulp production process if one does not add the sodium hydroxide solution that is otherwise absolutely necessary for peroxide bleaching. It is also possible to dispense with the use of known bleach stabilizers.
- the kraft or sulfate pulp treated by means of the method according to the invention can easily be used as a material for food packaging, e.g. Milk packs.
- the sulfate pulp produced in a continuous cooker is passed through a final Vasch filter after it has passed through the usual sorting and washing operations, on which it is obtained with a degree of washing out of 1.2 to 1.5% Na 2 SO 4 .
- the substance is thickened on the filter at 15% consistency, it falls with 7 0 0 C in a screw and pumped into a thick pulp tower, in which it supports 7 to 2o hours (diffusion Sturm).
- the fabric has a white content of 26.5.
- cochlea of a 1 0% aqueous hydrogen peroxide solution are distributed uniformly by means of a drip tray 1.5oo l / h.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
- Medicines Containing Material From Animals Or Micro-Organisms (AREA)
- Saccharide Compounds (AREA)
- Artificial Filaments (AREA)
Abstract
Description
Zellstoffe, welche nach dem Kraft- oder Sulfatverfahren erzeugt wurden, zeichnen sich durch hervorragende technologische Eigenschaften aus. Sie werden unter anderem nach einer Bleiche in grossen Mengen zur Papiererzeugung verwendet.Pulp, which was produced by the Kraft or sulfate process, are characterized by excellent technological properties. After bleaching, they are used in large quantities for paper production.
In ungebleichtem Zustand wird der Kraft- oder Sulfat- zellstoff in nicht unerheblicher Menge zur Herstellung von Verpackungsmaterialien, wie z.B. Kartons, eingesetzt. Auf Grund seiner sehr hohen Festigkeitseigenschaften eignet sich der Kraft- oder Sulfatzellstoff nämlich für Verpackungen, bei denen mit starker mechanischer Beanspruchung gerechnet werden muss.In the unbleached state, the fuel or sulfate pulp is used in a not inconsiderable amount for the production of packaging materials, e.g. Cardboard boxes used. Because of its very high strength properties, the kraft or sulfate pulp is particularly suitable for packaging in which heavy mechanical stress must be expected.
Der ungebleichte Kraft- oder Sulfatzellstoff weist jedoch wesentliche Nachteile auf, die seine Verwendung zur Herstellung von Verpackungsmaterial unerwünscht stark einschränken.However, the unbleached kraft or sulfate pulp has significant disadvantages which undesirably severely limit its use for the production of packaging material.
So sind z.B. die erhaltenen Verpackungsmaterialien auf Grund der braunen Farbe des Zellstoffes unansehnlich und hässlich. Weiterhin entstehen bei derSulfat-Kochung intensiv riechende schwefelhaltige Verbindungen, wie z.B. Äthyl- und Methylmerkaptan, die dem Kraft-oder Sulfatzellstoff einen charakteristischen Geruch verleihen und bei der Waschung und Trocknung nicht mit ausreichender Sicherheit entfernt werden können. Besonders nachteilig wirken sich diese Eigenschaften des Kraft- oder Sulfatzellstoffes bei Lebensmittelverpackungen aus, so dass bisher eine Verwendung des ungebleichten Kraft- oder Sulfatzellstoffes für diesen Zweck, z.B. für Milchverpackungen, nicht möglich ist.For example, the packaging materials obtained due to the brown color of the pulp unsightly and ugly. In addition, sulphate cooking produces intensely smelling sulfur-containing compounds, e.g. Ethyl and methyl mercaptan, which give the kraft or sulfate pulp a characteristic smell and cannot be removed with sufficient certainty during washing and drying. These properties of the fuel or sulfate pulp have a particularly disadvantageous effect on food packaging, so that hitherto the unbleached fuel or sulfate pulp has been used for this purpose, e.g. for milk packaging, is not possible.
Es besteht somit ein enormes Bedürfnis, auf eine wirtschaftlich vertretbare Weise mit den in Zellstofffabriken zur Verfügung stehenden, üblichen Anlagen den Kraft- und Sulfatzellstoff aufzuhellen und zu desodorieren und somit als Material für die Herstellung von Lebensmittelverpackungen verwendbar zu machen.There is therefore an enormous need to lighten and deodorize the fuel and sulfate pulp in an economically justifiable manner using the conventional systems available in pulp mills and thus to make it usable as a material for the production of food packaging.
Während der ungebleichte Kraft- oder Sulfatzellstoff mit einem Weissgehalt von ca. 25 bis 26 erhalten wird, soll Zellstoff für Lebensmittelverpackungen einen Weissgehalt von 3o bis 32 - ohne Verlust seiner guten Featigkeitseigenschaften - aufweisen.While the unbleached kraft or sulfate pulp is obtained with a white content of approx. 25 to 26, cellulose for food packaging is said to have a white content of 3o to 32 - without losing its good feature properties.
Um dem Verpackungsmaterial eine ansprechende Farbe zu verleihen, genügt es, den Weissgehalt des Kraft- oder Sulfatzellstoffes um ca. 5 bis 1o Punkte zu verbessern. Gegenstand der Erfindung ist ein Verfahren zum Aufhellen und Desodorieren von Kraft- oder Sulfatzellstoff, welches dadurch gekennzeichnet ist, dass man nach der Sulfat-Kochung während der Stoffaufbereitung im Bereich einer Diffusionswäsche unter Benutzung der in dem Zellstoff nach der alkalischen Kochung noch vorhandenen Restalkalität der Zellstoffsuspension ein Peroxid in einer Menge von 0,05 bis 3 Gev.-% (bezogen auf 100%iges Peroxid), bezogen auf atro-Zellstoff, zusetzt.In order to give the packaging material an appealing color, it is sufficient to improve the white content of the kraft or sulfate pulp by approx. 5 to 10 points. The invention relates to a process for lightening and deodorising fuel or sulfate pulp, which is characterized in that after the sulfate boil during stock preparation in the area of a diffusion wash using the residual alkalinity of the pulp suspension still present in the pulp after the alkaline boil a peroxide in an amount of 0, 05-3 Gev .-% (based on 100% peroxide), based on absolutely dry pulp, is added.
Dabei kann für die gewünschte Verbesserung des Weissgrades eine Menge an Peroxid von o,5 bis 2,5 Gew.-% (100%iges Peroxid) bezogen auf atro Zellstoff notwendig sein, während für die Desodorierung allein eine Menge von 0,05 bis o,3 Gew.-% Peroxid, bezogen auf atro Zellstoff, ausreichend sein kann.In this case, for the desired improvement of the whiteness of a quantity of peroxide of o.5 to 2.5 wt .-% (100% peroxide) relative be necessary, whereas for the deodorization Only an amount of 0, 05 to o to absolutely dry pulp , 3 wt .-% peroxide, based on dry cellulose, may be sufficient.
Als Peroxid wird vorzugsweise Wasserstoffperoxid in wässriger Lösung verwendet. Die Restalkalität der Zellstoffsuspension kann zu Beginn der Zugabe des Peroxides einem Auswaschungsgrad von o,2 bis 1,8 Gew.-% Na2SO4, vorzugsweise von 1,2 bis 1,5 Gew.-% Na2SO4 entsprechen. Bei dem erfindungsgemässen Verfahren ist vor allem vorteilhaft, dass in der benutzten Phase des Kraft- oder Sulfatzellstoffherstellverfahrens die Zellstoffsuspension mit einer Stoffdichte von 1o bis 15 Gew.-%, bezogen auf atro Zellstoff bei hohen Temperaturen, welche in dem Bereich von 6o bis 80°C liegen, anfällt und mehrere Stunden, vorzugsweise 7 bis 2o Stunden, gelagert wird.Hydrogen peroxide in aqueous solution is preferably used as the peroxide. The residual alkalinity of the cellulose suspension at the beginning of the addition of the peroxide can correspond to a degree of leaching of from 0.2 to 1.8% by weight of Na 2 SO 4 , preferably from 1.2 to 1.5% by weight of Na 2 SO 4 . In the process according to the invention, it is particularly advantageous that in the phase of the kraft or sulfate pulp production process used, the pulp suspension with a consistency of 10 to 15% by weight, based on dry cellulose at high temperatures, which are in the range from 60 to 80 ° C, accumulates and is stored for several hours, preferably 7 to 20 hours.
Darüberhinaus kann das erfindungsgemässe Verfahren bei Stoffdichten im Bereich von 3 bis 2o Gew.%, sowie bei Temperaturen im Bereich von 4o bis 90°C durchgeführt werden. Eine Temperatur von 6o bis 70°C ist besonders vorteilhaft.In addition, the process according to the invention can be carried out at material densities in the range from 3 to 20% by weight and at temperatures in the range from 4o to 90 ° C. A temperature of 6o to 70 ° C is special advantageous.
Die Lagerzeit des Zellstoffes kann darüberhinaus zwischen 1 bis 25 Stunden und in einer vorteilhaften Ausführungsform 7 bis 15 Stunden betragen.The storage time of the pulp can moreover be between 1 to 25 hours and in an advantageous embodiment 7 to 15 hours.
Normalerweise wird bei der Produktion von Sulfat- Zellstoff im Bereich der Diffnsionswäsche ein Auswaschungsgrad erreicht, der für die Peroxidbehandlung optimal ist. Sollte dies jedoch nicht der Fall sein, so ist es notwendig, die Restalkalität (Auswaschungsgrad) zu korrigieren.In the production of sulfate pulp in the area of the diffusion wash, a degree of washout is normally achieved which is optimal for the peroxide treatment. However, if this is not the case, it is necessary to correct the residual alkalinity (degree of washout).
Eine zu hohe Alkalität des Zellstoffes bewirkt einen zu raschen Peroxidverbrauch und damit ein schlechtes Ergebnis. In solchen Fällen ist es vorteilhaft, das einzusetzende Peroxid mit einer adäquaten Säuremenge zu versehen, die ausreicht, die Alkalität des Zellstoffes in den optimalen Bereich zu bringen. Als Säure kann man anorganische oder organische Säuren verwenden, die keine reduzierenden Anteile beinhalten. Vorteilhafterweise kann Schwefelsäure eingesetzt werden.If the pulp is too alkaline, the peroxide consumption is too rapid and the result is poor. In such cases it is advantageous to provide the peroxide to be used with an adequate amount of acid which is sufficient to bring the alkalinity of the pulp into the optimum range. Inorganic or organic acids which do not contain reducing components can be used as the acid. Sulfuric acid can advantageously be used.
Das erfindungsgemässe Verfahren ist überraschenderweise in der beschriebenen Phase des Kraft- oder Sulfat-Zellstoffherstellverfahrens möglich, obwohl bekannte Rezepturen für eine Zellstoffbleiche mit Peroxid in dieser Phase des Zellstoffherstellverfahrens keine ausreichenden Ergebnisse erzielen. Es : besteht daher die allgemein herrschende Meinung, dass noch aus der Kochung vorhandene, nicht ausgewaschene oxidierbare Anteile zu einem vorzeitigen Peroxidverbrauch führten und eine Bleiche unmöglich machten. Überraschenderweise hat sich nun bei dem erfindungsgemässen Verfahren gezeigt, das eine Peroxidbleiche in der beschriebenen Phase des Kraft- oder Sulfat-Zellstoffherstellverfahrens möglich ist, wenn man auf die Zugabe der für eine Peroxidbleiche ansonsten unbedingt notwendigen Natronlauge verzichtet. Auch anf die Mitverwendung von bekannten Bleichstabilisatoren kann verzichtet werden.The process according to the invention is surprisingly possible in the phase of the kraft or sulfate pulp production process described, although known formulations for pulp bleaching with peroxide do not achieve adequate results in this phase of the pulp production process. It: therefore there is a generally held opinion that remaining from the cooking, not washed oxidizable shares to premature peroxide led and made a bleach impossible. Surprisingly, it has now been shown in the process according to the invention that peroxide bleaching is possible in the described phase of the kraft or sulfate pulp production process if one does not add the sodium hydroxide solution that is otherwise absolutely necessary for peroxide bleaching. It is also possible to dispense with the use of known bleach stabilizers.
Der mittels am erfindungagemässen Verfahren behandelte Kraft- oder Sulfat-Zellstoff kann ohne Schwierigkeiten als Material für Lebensmittelverpackungen, z.B. Milchpackungen, verwendet werden.The kraft or sulfate pulp treated by means of the method according to the invention can easily be used as a material for food packaging, e.g. Milk packs.
Das erfindungsgemässe Verfahren wird anhand der folenden Beispiele näher erläutert und beschrieben:The process according to the invention is explained and described in more detail with reference to the following examples:
Der in einem kontinuierlichen Kocher erzeugte Sulfat- Zellstoff wird nach Durchlaufen der üblichen Sortierungs- und Waschungsoperationen über ein letztes Vaschfilter geleitet, auf dem er mit einem Auswaschungsgrad von 1,2 bis 1,5 % Na2SO4 anfällt. Der Stoff wird am Filter auf 15% Stoffdichte eingedickt, er fällt mit 70 0C in eine Schnecke und wird in einem Dickstoffturm gepumpt, in dem er 7 bis 2o Stunden lagert (Diffusionsturm).The sulfate pulp produced in a continuous cooker is passed through a final Vasch filter after it has passed through the usual sorting and washing operations, on which it is obtained with a degree of washing out of 1.2 to 1.5% Na 2 SO 4 . The substance is thickened on the filter at 15% consistency, it falls with 7 0 0 C in a screw and pumped into a thick pulp tower, in which it supports 7 to 2o hours (diffusion Sturm).
Am Turmeingang hat der Stoff 26,5 Weissgehalt. In der Schnecke werden mittels einer Tropfrinne 1.5oo l/h einer 10 %igen wässrigen Wasserstoffperoxidlösung gleichmässig verteilt.At the tower entrance the fabric has a white content of 26.5. In the cochlea of a 1 0% aqueous hydrogen peroxide solution are distributed uniformly by means of a drip tray 1.5oo l / h.
Entsprechend der Produktion von 10.000 kg/h Sulfat-Zellstoff entspricht dies der Anwendung von 1,5% H2O2 Der nach 7 Stunden Reaktionszeit aus dem Turm kontinuierlich abgepumpte Stoff hat einen Weissgehalt von 32 bei gleichzeitiger Veränderung des Farbtons von Graubraun zu bräunlichgelb. Er ist praktisch geruchlos. Die Festigkeitseigenschaften vor und nach der Behandlung sind gleich.Corresponding to the production of 10,000 kg / h of sulfate pulp, this corresponds to the use of 1.5% H 2 O 2. The substance, which was pumped continuously out of the tower after a reaction time of 7 hours, has a white content of 32 with a simultaneous change in color from gray-brown to brownish-yellow. It is practically odorless. The strength properties before and after the treatment are the same.
In der in Beispiel 1 beschriebenen Anlage werden an der gleichen Zngabestelle 150 1/h einer 10%igen Wasserstoffperoxidlösung zudosiert, was auf Stoff bezogen 0,15% entspricht. Der Weissgehalt des nach 1o Stunden Reaktions- und Lagerzeit aus dem Stapelturm entnommenen Stoffes war mit 27,5 praktisch unverändert, Der zuvor eindringliche Geruch war verschwunden, so dass der Stoff für eine Produktion von Milchbecherkarton eingesetzt werden konnte.In the system described in Example 1, 15 0 1 / h of a 10% strength hydrogen peroxide solution are metered in at the same point, which corresponds to 0.15% based on the substance. The whiteness of the substance removed from the stacking tower after 10 hours of reaction and storage time was practically unchanged at 27.5. The previously penetrating smell had disappeared, so that the substance could be used for the production of milk carton.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT79104899T ATE2019T1 (en) | 1979-02-16 | 1979-12-04 | PROCESS FOR COLOR IMPROVEMENT AND DEODORIZATION OF SULFATE PULP. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2905936 | 1979-02-16 | ||
| DE2905936A DE2905936B1 (en) | 1979-02-16 | 1979-02-16 | Process for lightening and deodorising sulfate pulp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0014753A1 true EP0014753A1 (en) | 1980-09-03 |
| EP0014753B1 EP0014753B1 (en) | 1982-12-15 |
Family
ID=6063083
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP79104899A Expired EP0014753B1 (en) | 1979-02-16 | 1979-12-04 | Process for improving the colour and for the deodorisation of sulphate pulp |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0014753B1 (en) |
| AT (1) | ATE2019T1 (en) |
| CA (1) | CA1129157A (en) |
| DE (2) | DE2905936B1 (en) |
| FI (1) | FI68684C (en) |
| NO (1) | NO793959L (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0073872A1 (en) * | 1981-09-03 | 1983-03-16 | Billerud Uddeholm AB | Chemical process in the manufacture of paper |
| EP0076788A1 (en) * | 1981-09-22 | 1983-04-13 | Holmens Bruk Aktiebolag | Use of substances giving off oxygen in reduction of dark colouring of pulp |
| FR2533947A1 (en) * | 1982-08-05 | 1984-04-06 | Honshu Paper Co Ltd | PROCESS FOR PRODUCING PAPER AND PACKAGING MATERIAL FOR WRAPPING METAL PRODUCTS |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2504375C1 (en) * | 2012-05-23 | 2014-01-20 | Галина Викторовна Сукоян | Pharmaceutical formulation for treating diseases associated with endothelial dysfunction |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1454339A (en) * | 1921-11-28 | 1923-05-08 | Brown Co | Method of treating cellulose pulp to remove odors therefrom |
| US1632802A (en) * | 1926-08-10 | 1927-06-21 | Brown Co | Process of and apparatus for treating fiber |
| US1774403A (en) * | 1926-09-16 | 1930-08-26 | Brown Co | Process of producing fiber of high alpha cellulose content |
| DE2710806A1 (en) * | 1976-03-12 | 1977-09-15 | Interox | METHOD FOR DISINFECTING WASTE PAPER |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2030384A (en) * | 1934-10-18 | 1936-02-11 | Nekoosa Edwards Paper Co | Method of bleaching pulp |
| BE450336A (en) * | 1942-12-09 | 1943-05-31 | ||
| FR2192981B1 (en) * | 1972-07-21 | 1988-11-10 | Air Liquide Fr |
-
1979
- 1979-02-16 DE DE2905936A patent/DE2905936B1/en not_active Withdrawn
- 1979-11-27 FI FI793720A patent/FI68684C/en not_active IP Right Cessation
- 1979-12-04 DE DE7979104899T patent/DE2964319D1/en not_active Expired
- 1979-12-04 EP EP79104899A patent/EP0014753B1/en not_active Expired
- 1979-12-04 AT AT79104899T patent/ATE2019T1/en not_active IP Right Cessation
- 1979-12-05 NO NO793959A patent/NO793959L/en unknown
-
1980
- 1980-02-13 CA CA345,493A patent/CA1129157A/en not_active Expired
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1454339A (en) * | 1921-11-28 | 1923-05-08 | Brown Co | Method of treating cellulose pulp to remove odors therefrom |
| US1632802A (en) * | 1926-08-10 | 1927-06-21 | Brown Co | Process of and apparatus for treating fiber |
| US1774403A (en) * | 1926-09-16 | 1930-08-26 | Brown Co | Process of producing fiber of high alpha cellulose content |
| DE2710806A1 (en) * | 1976-03-12 | 1977-09-15 | Interox | METHOD FOR DISINFECTING WASTE PAPER |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0073872A1 (en) * | 1981-09-03 | 1983-03-16 | Billerud Uddeholm AB | Chemical process in the manufacture of paper |
| EP0076788A1 (en) * | 1981-09-22 | 1983-04-13 | Holmens Bruk Aktiebolag | Use of substances giving off oxygen in reduction of dark colouring of pulp |
| FR2533947A1 (en) * | 1982-08-05 | 1984-04-06 | Honshu Paper Co Ltd | PROCESS FOR PRODUCING PAPER AND PACKAGING MATERIAL FOR WRAPPING METAL PRODUCTS |
| GB2158474A (en) * | 1982-08-05 | 1985-11-13 | Honshu Paper Co Ltd | For packaging metallic material |
Also Published As
| Publication number | Publication date |
|---|---|
| NO793959L (en) | 1980-08-19 |
| DE2905936B1 (en) | 1980-04-30 |
| CA1129157A (en) | 1982-08-10 |
| ATE2019T1 (en) | 1982-12-15 |
| FI68684C (en) | 1985-10-10 |
| DE2964319D1 (en) | 1983-01-20 |
| EP0014753B1 (en) | 1982-12-15 |
| FI793720A (en) | 1980-08-17 |
| FI68684B (en) | 1985-06-28 |
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