EP0489066B1 - Process for the re-treatment of mechanical wood pulp - Google Patents
Process for the re-treatment of mechanical wood pulp Download PDFInfo
- Publication number
- EP0489066B1 EP0489066B1 EP90912647A EP90912647A EP0489066B1 EP 0489066 B1 EP0489066 B1 EP 0489066B1 EP 90912647 A EP90912647 A EP 90912647A EP 90912647 A EP90912647 A EP 90912647A EP 0489066 B1 EP0489066 B1 EP 0489066B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- wood pulp
- steam
- treated
- treatment
- wood
- 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
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Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/02—Pretreatment of the raw materials by chemical or physical means
- D21B1/021—Pretreatment of the raw materials by chemical or physical means by chemical means
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
Definitions
- the invention relates to a method for the thermal aftertreatment of mechanically produced wood pulp, which is used for paper, cardboard and cardboard production.
- the wood pulp used in the paper and cardboard industry is said to have the highest possible level of splinter-free properties and good strength properties such as tear length, tear resistance and burst pressure as well as high volume and rigidity. For this reason, an attempt is made to produce a wood grind with a high degree of grinding and few chips on the grinder. On the other hand, the high degree of freeness, which is favorable for the strength values, causes a deterioration on the paper machine screen Drainage behavior so that the speed of the paper machine is limited.
- the thickened wood pulp is initially exposed to water vapor at a dry content of 10 to 50%, and then the vapor produced is optionally removed using suitable means, such as blowers or expansion devices, so that the dry content of the wood pulp is essentially not affected.
- the amount of steam used for the aftertreatment is dependent on the flow rate per unit time Wood pulp quantity between 0.1 and 1 t / steam per ton of dry wood pulp selected. A lower amount of steam and vice versa is used with a higher dry content of the sanded wood.
- the regulation of the amount of steam can advantageously be controlled by the pulp suspension fed to the thickener, the consistency of which is known.
- the temperature of the wood pulp treated with steam is monitored and does not exceed 110 ° C., since otherwise there is a noticeable yellowing with all the adverse effects on the end product. It is therefore expedient to use the temperature of the wood pulp treated with steam as a further control variable for measuring the amount of steam.
- the thermal aftertreatment can be carried out with conventional wet or saturated steam, advantageously saturated low-pressure steam with a temperature of 105 to 180 ° C. being used.
- the vapor pressure is only determined by the amount of water vapor to be used. It is advantageously chosen between 1.1 x 105 Pa (1.1 bar) and 8.0 x 105 Pa (8.0 bar), whereby the pressure can also be used for mixing with the wood pulp if the feed elements for the wood pulp are appropriately designed . Higher vapor pressures are not recommended due to the structural and constructive measures then required.
- the duration of the thermal aftertreatment is advantageously chosen between 0.5 and 60 minutes.
- the temperature of the wood pulp after the steam treatment is also advantageously used here as a control variable.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Paper (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zur thermischen Nachbehandlung von mechanisch hergestelltem Holzschliff, der für die Papier-, Pappe- und Kartonproduktion eingesetzt wird.The invention relates to a method for the thermal aftertreatment of mechanically produced wood pulp, which is used for paper, cardboard and cardboard production.
Die Erzeugung von Holzschliff durch mechanische Zerkleinerung von Rundholz auf Schleifsteinen unter Wasserzugabe ist bekannt und ausführlich in der Literaturstelle "TAPPI, Pulp and Paper Manufacture, Volume 2, Mechanical Pulping, 1987" beschrieben.The production of ground wood by mechanical comminution of round wood on grindstones with the addition of water is known and is described in detail in the reference "TAPPI, Pulp and Paper Manufacture, Volume 2, Mechanical Pulping, 1987".
Der in der Papier- und Kartonindustrie eingesetzte Holzschliff soll eine möglichst hohe Splitterfreiheit aufweisen bei gleichzeitig guten Festigkeitseigenschaften, wie Reißlänge, Fortreißfestigkeit und Berstdruck sowie hohes Volumen und Steifigkeit. Daher wird versucht, bereits am Schleifer einen Holzschliff mit einem hohen Mahlgrad und wenig Splitter zu erzeugen. Der für die Festigkeitswerte an sich günstige hohe Mahlgrad verursacht jedoch andererseits auf dem Papiermaschinensieb ein verschlechtertes Entwässerungsverhalten, so daß die Geschwindigkeit der Papiermaschine beschränkt ist. Es wurden zwar sogenannte Entwässerungsbeschleuniger bekannt, die auf Polyäthyleniminbasis oder Polyamidamin-Epichlorhydrinbasis zunächst gute Erfolge zeigten, jedoch aufgrund der Kreislaufwasserschließung in den Karton- und Papierfabriken und der dadurch bedingten Anreicherung der aus dem Holzschliff stammenden organischen Störstoffe immer mehr an ihrer Wirksamkeit verloren.The wood pulp used in the paper and cardboard industry is said to have the highest possible level of splinter-free properties and good strength properties such as tear length, tear resistance and burst pressure as well as high volume and rigidity. For this reason, an attempt is made to produce a wood grind with a high degree of grinding and few chips on the grinder. On the other hand, the high degree of freeness, which is favorable for the strength values, causes a deterioration on the paper machine screen Drainage behavior so that the speed of the paper machine is limited. So-called drainage accelerators became known, which initially showed good successes based on polyethylene imine or polyamide amine-epichlorohydrin, but increasingly lost their effectiveness due to the closed-circuit water in the cardboard and paper mills and the resulting accumulation of the organic contaminants from the wood pulp.
Ein weiterer Nachteil des Holzschliffes, der mit hohem Mahlgrad erzeugt wird, besteht darin, daß das spezifische Volumen eines daraus gefertigten Papieres, gemessen in cm³ /g, abnimmt und damit eine Verringerung der Steifigkeit einhergeht.Another disadvantage of wood grinding, which is produced with a high degree of grinding, is that the specific volume of a paper made therefrom, measured in cm³ / g, decreases and this is accompanied by a reduction in the rigidity.
Es wurden bisher bereits viele Versuche durchgeführt, durch zusätzliche Wärmezufuhr die Qualität des zu erzeugenden Steinschliffes zu verbessern. Die Literaturstelle "K. H. Klemm: Neuzeitliche Holzschlifferzeugung, Wiesbaden, 1957" berichtet auf Seite 250 ff. über das sogenannte Braunschliffverfahren, das einen bezüglich der Festigkeitswerte verbesserten Holzschliff ergibt. Dabei werden die zu verschleifenden Holzstämme einer Vorbehandlung mit Heißwasser oder Dampf unterzogen. Nachteilig bei diesem Verfahren ist, daß sich das Holz stark verfärbt und der daraus erzeugte Holzschliff nur für Packpapiere und verschiedene Pappe-Qualitäten verwendet werden kann, bei denen der braune bis tiefbraune Farbton nicht stört. Keinesfalls ist dieser Braunschliff zur Herstellung von hellem Zeitungsdruck oder Schreibpapieren oder hellen Kartons geeignet. Aufgabe der vorliegenden Erfindung ist es daher, ein Verfahren zur Verfügung zu stellen, das einen Holzschliff mit verringertem Mahlgrad und erhöhtem spezifischem Volumen bei Erhaltung der Weiße ergibt.So far, many attempts have been made to improve the quality of the stone grinding to be produced by adding additional heat. The literature reference "KH Klemm: Modern Wood Chip Production, Wiesbaden, 1957" reports on page 250 ff. On the so-called brown sanding process, which results in an improved wood sanding with regard to the strength values. The logs to be sanded are pretreated with hot water or steam. The disadvantage of this process is that the wood becomes heavily discolored and the resulting sanded wood can only be used for packaging paper and various cardboard qualities in which the brown to deep brown color does not interfere. In no way is this brown cut for the production of bright newspaper printing or writing paper or light cardboard. It is therefore an object of the present invention to provide a process which gives a wood pulp with a reduced degree of grinding and an increased specific volume while maintaining the whiteness.
Die Aufgabe wird durch den kennzeichnenden Teil des Anspruches 1 und die darauf zurückbezogenen Unteransprüche 2 bis 5 gelöst.The object is achieved by the characterizing part of claim 1 and the subclaims 2 to 5 which refer back to it.
Obwohl in der oben angeführten Literatur bereits mehrfach auf die Vorteile einer Temperaturerhöhung während des Schleifverfahrens hingewiesen wurde, wurde nun überraschend festgestellt, daß durch eine thermische Nachbehandlung des sogenannten "büttenfertigen" Holzschliffes, dessen Qualität noch entscheidend verbessert werden kann, ohne daß eine merkliche Verschlechterung der Weiße eintritt. Unter "büttenfertig" wird dabei ein Holzschliff verstanden, der am Ende des Schleifereiprozesses am Stoffeindicker mit einem Trockengehalt von 10 bis 50 % zur weiteren Verarbeitung in der Papierfabrik anfällt.Although the advantages of increasing the temperature during the grinding process have already been mentioned several times in the literature cited above, it has now surprisingly been found that a thermal aftertreatment of the so-called "hand-made" wood sanding, the quality of which can still be significantly improved without a noticeable deterioration in the White entry. "Ready-to-make" is understood to mean a wood sanding which occurs at the end of the grinding process on the fabric thickener with a dry content of 10 to 50% for further processing in the paper mill.
Erfindungsgemäß wird der eingedickte Holzschliff bei einem Trockengehalt von 10 bis 50 % zunächst mit Wasserdampf beaufschlagt und anschließend der entstandene-Brüdendampf ggf. unter Einsatz geeigneter Mittel, wie Gebläse oder Entspannungsvorrichtungen, abgezogen, so daß der Trockengehalt des Holzschliffes im wesentlichen nicht beeinflußt wird.According to the invention, the thickened wood pulp is initially exposed to water vapor at a dry content of 10 to 50%, and then the vapor produced is optionally removed using suitable means, such as blowers or expansion devices, so that the dry content of the wood pulp is essentially not affected.
Die zur Nachbehandlung eingesetzte Dampfmenge wird in Abhängigkeit von der pro Zeiteinheit durchgesetzten Holzschliffmenge zwischen 0,1 und 1 t/Dampf pro Tonne atro Holzschliff gewählt. Dabei wird bei höherem Trockengehalt des Holzschliffes eine geringere Dampfmenge und umgekehrt angewendet. Die Regelung der Dampfmenge kann vorteilhafterweise durch die dem Eindicker zugeführte Holzschliffsuspension, deren Stoffdichte bekannt ist, gesteuert werden.The amount of steam used for the aftertreatment is dependent on the flow rate per unit time Wood pulp quantity between 0.1 and 1 t / steam per ton of dry wood pulp selected. A lower amount of steam and vice versa is used with a higher dry content of the sanded wood. The regulation of the amount of steam can advantageously be controlled by the pulp suspension fed to the thickener, the consistency of which is known.
Es hat sich weiter als vorteilhaft herausgestellt, daß die Temperatur des mit Dampf behandelten Holzschliffes überwacht wird und dabei 110 °C nicht überschreitet, da ansonsten eine merkliche Vergilbung mit allen nachteiligen Auswirkungen auf das Endprodukt eintritt. Zweckmäßigerweise wird deshalb die Temperatur des mit Dampf behandelten Holzschliffes als weitere Steuergröße zur Bemessung der Dampfmenge herangezogen.It has also proven to be advantageous that the temperature of the wood pulp treated with steam is monitored and does not exceed 110 ° C., since otherwise there is a noticeable yellowing with all the adverse effects on the end product. It is therefore expedient to use the temperature of the wood pulp treated with steam as a further control variable for measuring the amount of steam.
Die thermische Nachbehandlung kann mit üblichem Naß- oder Sattdampf durchgeführt werden, wobei vorteilhafterweise gesättigter Niederdruckdampf mit einer Temperatur von 105 bis 180 °C verwendet wird. Der Dampfdruck ist an sich nur durch die Menge des anzuwendenden Wasserdampfes bestimmt.
Vorteilhafterweise wird er zwischen 1,1 x 10⁵ Pa (1,1 bar) und 8,0 x 10⁵ Pa (8,0 bar) gewählt, wobei der Druck bei zweckmäßiger Ausgestaltung der Zuführungsorgange zum Holzschliff zusätzlich zur Mischung mit dem Holzschliff herangezogen werden kann. Höhere Dampfdrücke sind wegen der dann erforderlichen baulichen und konstruktiven Maßnahmen nicht empfehlenswert.The thermal aftertreatment can be carried out with conventional wet or saturated steam, advantageously saturated low-pressure steam with a temperature of 105 to 180 ° C. being used. The vapor pressure is only determined by the amount of water vapor to be used.
It is advantageously chosen between 1.1 x 10⁵ Pa (1.1 bar) and 8.0 x 10⁵ Pa (8.0 bar), whereby the pressure can also be used for mixing with the wood pulp if the feed elements for the wood pulp are appropriately designed . Higher vapor pressures are not recommended due to the structural and constructive measures then required.
Die Dauer der thermischen Nachbehandlung wird vorteilhafterweise zwischen 0,5 und 60 Min. gewählt.The duration of the thermal aftertreatment is advantageously chosen between 0.5 and 60 minutes.
Auch hier ist zu berücksichtigen, daß bei höheren Dampftemperaturen und Trockengehalten des zu behandelnden Holzschliffes eine kürzere Verweilzeit gewählt wird, um eine Faserschädigung zu vermeiden.It should also be taken into account here that at higher steam temperatures and dry contents of the wood pulp to be treated, a shorter dwell time is selected in order to avoid damage to the fibers.
Vorteilhafterweise wird hier ebenfalls als Regelgröße die Temperatur des Holzschliffes nach der Dampfbehandlung herangezogen.The temperature of the wood pulp after the steam treatment is also advantageously used here as a control variable.
Zur Durchführung des Verfahrens haben sich übliche Mischapparturen, wie Rohrreaktoren, Ein- oder Zweiwellenmischer, die ggf. bei höheren Drücken mit Speise-Schnecken und Zellenschleusen o. ä. bekannten Vorrichtungen zur Druckhaltung bzw. Entspannung versehen sind. Diesen Mischapparaturen schließt sich eine Ausdampfvorrichtung an, in der der erzeugte Brüdendampf abgezogen wird. Im einfachsten Fall ist die Ausdampfvorrichtung ein umlaufendes Siebband mit Abzugshaube. In dieser Ausdampfvorrichtung kann zusätzlich noch Kühlluft zugeführt werden, um den behandelten Holzschliff auf eine übliche Weiterverarbeitungstemperatur von 40 bis 60 °C herunterzukühlen.Conventional mixing apparatuses, such as tubular reactors, single- or twin-shaft mixers, which may be provided with feed screws and cell locks or similar devices for maintaining or releasing pressure at higher pressures, have been used to carry out the process. This mixing apparatus is followed by an evaporation device in which the vapor generated is drawn off. In the simplest case, the evaporation device is a circulating sieve belt with an extractor hood. In this evaporation device, cooling air can additionally be supplied in order to cool the treated wood pulp down to a customary further processing temperature of 40 to 60 ° C.
In dem nachfolgenden Beispiel 1 ist die Durchführung des erfindungsgemäßen Verfahrens beschrieben.In the following example 1, the implementation of the method according to the invention is described.
Ein auf einem Banddruckfilter auf einen Trockengehalt von 33 % atro entwässerter Holzschliff wurde mit
- a) 0,5 t Dampf / t Holzschliff
- b) 1,0 t Dampf / t Holzschliff
in einem Einwellenzerfaserer oder in einer Bedampfungsschnecke behandelt. Dabei betrug die Temperatur des Dampfes 130 °C und der Druck 2,8 x 10⁵ Pa (2,8 bar), die Verweilzeit lag in beiden Aggregaten bis zu 5 Minuten. Am Ende stellte sich eine Temperatur des behandelten Holzschliffes von 90 bis 96 °C ein.A wood pulp dewatered on a belt pressure filter to a dry content of 33% atro was also included
- a) 0.5 t steam / t wood pulp
- b) 1.0 t steam / t wood pulp
treated in a single-wave fiberizer or in a steaming screw. The temperature of the steam was 130 ° C and the pressure 2.8 x 10⁵ Pa (2.8 bar), the residence time was up to 5 minutes in both units. At the end, the temperature of the treated wood pulp reached 90 to 96 ° C.
Vor und nach der Behandlung wurden die papiertechnischen Werte des Holzschliffes bestimmt, die in der folgenden Tabelle wiedergegeben sind.
Aus der Tabelle ist deutlich erkennbar, daß durch die erfindungsgemäße Behandlung die Werte für den Mahlgrad in ° SR abgesenkt und das spezifische Volumen erhöht werden können, ohne daß eine signifikante Beeinflussung der Weiße stattfindet.The table clearly shows that the treatment according to the invention lowers the values for the degree of grinding in ° SR and the specific volume can be increased without a significant Influencing the whiteness takes place.
Claims (5)
- Process for the thermal after-treatment of mechanical wood pulp for paper, paperboard or cardboard manufacture, characterised in that the wood pulp, at a dry content of from 10 to 50 % and at a temperature not exceeding 110°C, is treated with steam and thereafter the exhaust vapour is drawn off.
- Process according to claim 1, characterised in that the wood pulp is treated with from 0.1 to 1 t of steam per t absolute dry weight of wood pulp.
- Process according to claims 1 and 2, characterised in that the wood pulp is treated with saturated low pressure steam at a temperature of from 105 to 180°C and under a pressure of from 1.1 x 10⁵ Pa (1.1 bar) to 8 x 10⁵ Pa (8 bar).
- Process according to claims 1 to 3, characterised in that the wood pulp is treated with steam for a period of from 0.5 to 60 minutes.
- Process according to claims 1 to 4, characterised in that the steam treatment is carried out in a mixing apparatus followed by a steam removal apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT90912647T ATE98711T1 (en) | 1989-08-25 | 1990-08-21 | METHOD OF POST-TREATMENT OF WOOD Pulp. |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3928058A DE3928058A1 (en) | 1989-08-25 | 1989-08-25 | METHOD FOR TREATING WOOD GRIND |
| DE3928058 | 1989-08-25 | ||
| DD34363890A DD301791A7 (en) | 1989-08-25 | 1990-08-24 | METHOD FOR TREATING WOODEN SLIP |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0489066A1 EP0489066A1 (en) | 1992-06-10 |
| EP0489066B1 true EP0489066B1 (en) | 1993-12-15 |
Family
ID=37728154
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP90912647A Expired - Lifetime EP0489066B1 (en) | 1989-08-25 | 1990-08-21 | Process for the re-treatment of mechanical wood pulp |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0489066B1 (en) |
| DD (1) | DD301791A7 (en) |
| DE (1) | DE3928058A1 (en) |
| ES (1) | ES2047945T3 (en) |
| FI (1) | FI101404B1 (en) |
| WO (1) | WO1991002838A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007022749A1 (en) * | 2007-05-11 | 2008-11-13 | Voith Patent Gmbh | Lignocellulosic wood pulp |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI51216C (en) * | 1975-04-04 | 1976-11-10 | Yhtyneet Paperitehtaat Oy | Method and device for producing hot abrasive pulp. |
| CA1074606A (en) * | 1977-06-08 | 1980-04-01 | Llewellyn E. Clark | Method and apparatus for thermo-mechanical pulping |
-
1989
- 1989-08-25 DE DE3928058A patent/DE3928058A1/en not_active Withdrawn
-
1990
- 1990-08-21 ES ES90912647T patent/ES2047945T3/en not_active Expired - Lifetime
- 1990-08-21 EP EP90912647A patent/EP0489066B1/en not_active Expired - Lifetime
- 1990-08-21 WO PCT/EP1990/001378 patent/WO1991002838A1/en active IP Right Grant
- 1990-08-24 DD DD34363890A patent/DD301791A7/en unknown
-
1992
- 1992-02-21 FI FI920774A patent/FI101404B1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| DD301791A7 (en) | 1994-01-20 |
| DE3928058A1 (en) | 1991-02-28 |
| EP0489066A1 (en) | 1992-06-10 |
| FI101404B (en) | 1998-06-15 |
| FI920774A0 (en) | 1992-02-21 |
| ES2047945T3 (en) | 1994-03-01 |
| FI101404B1 (en) | 1998-06-15 |
| WO1991002838A1 (en) | 1991-03-07 |
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