DE102006037697A1 - Method for production of ground wood, comprises mechanically separating ground wood fibers individually/in groups from circumference of tree-trunk, and carrying out separating tool in circumferential direction of tree-trunk - Google Patents
Method for production of ground wood, comprises mechanically separating ground wood fibers individually/in groups from circumference of tree-trunk, and carrying out separating tool in circumferential direction of tree-trunk Download PDFInfo
- Publication number
- DE102006037697A1 DE102006037697A1 DE200610037697 DE102006037697A DE102006037697A1 DE 102006037697 A1 DE102006037697 A1 DE 102006037697A1 DE 200610037697 DE200610037697 DE 200610037697 DE 102006037697 A DE102006037697 A DE 102006037697A DE 102006037697 A1 DE102006037697 A1 DE 102006037697A1
- Authority
- DE
- Germany
- Prior art keywords
- tree
- trunk
- heating
- ground wood
- production
- 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.)
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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
- D21B1/04—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
- D21B1/14—Disintegrating in mills
- D21B1/18—Disintegrating in mills in magazine-type machines
- D21B1/20—Disintegrating in mills in magazine-type machines with chain feed
Abstract
Description
Die Erfindung bezieht sich auf ein Verfahren gemäß dem Oberbegriff des Anspruchs 1.The The invention relates to a method according to the preamble of the claim 1.
Verfahren
der oben angegebenen Art dienen der Erzeugung von Faserstoff (Holzschliff),
indem aus einem Rundholzmaterial, insbesondere Baumstämmen, mit
mechanischen Mitteln der Faserstoff herausgetrennt wird. Solches
Rundholzmaterial ist in der Regel nicht exakt kreisrund im Querschnitt.
Wichtig ist, dass sich bei gewachsenem Holz die Fasern senkrecht
zum Querschnitt, also in Axialrichtung, erstrecken. Die zum Heraustrennen
geeigneten Holzschleifer sind seit langem bekannt. Beispiele finden sich
in der
Der Erfindung liegt die Aufgabe zu Grunde, ein Verfahren zu schaffen, mit dem es möglich ist, die Qualität des erzeugten Holzschliffs zu verbessern.Of the Invention is based on the object to provide a method with which it is possible is, the quality to improve the generated wood pulp.
Diese Aufgabe wird durch die Merkmale des Anspruchs 1 gelöst.These The object is solved by the features of claim 1.
Mit Hilfe des erfindungsgemäßen Verfahrens ist es möglich, die an sich bekannte und vorteilhafte Erwärmung des Baumstammes vor dem Schleifvorgang relativ schnell durchzuführen. Durch Mikrowellen wird das im gesamten Holzmaterial verteilte Wasser in hochfrequente Schwinungen versetzt, was eine schnelle durchgehende Erwärmung auch größerer Teile bewirkt. Es hat sich als nachteilig herausgestellt, dass bei den bisher bekannten Verfahren eine ausreichende Erwärmung des Baumstammes nur an seinem Umfang möglich ist, da – anders als beim sogenannten Refinerschliff, der mit Hackschnitzeln durchgeführt wird – nicht die erforderliche Zeit zur Verfügung steht, dass die Erwärmung bis in das Zentrum des Baumstammes erfolgen kann. Die für die Erwärmung nach dem erfindungsgemäßen Verfahren notwendige Verweilzeit ist so gering, dass ein industrieller Produktionsbetrieb der Holzschlifferzeugungsanlage möglich ist.With Help of the method is it is possible the known and advantageous heating of the tree trunk before the Grinding process to perform relatively quickly. By microwaves is the distributed throughout the wood material water in high-frequency vibrations offset, resulting in rapid continuous heating of even larger parts causes. It has proved to be disadvantageous that in the previously known methods sufficient heating of the tree trunk only at his Scope possible is, there - different as the so-called Refinerschliff, which is carried out with wood chips - not the time required stands that warming can take place in the center of the tree trunk. The for heating after the method according to the invention necessary residence time is so low that an industrial production plant the wood pulp production plant is possible.
Die übliche Erwärmung des Holzmaterials, z.B. durch Dampfkondensation an der Oberfläche und Wärmeleitung innerhalb des Holzmaterials, macht relativ hohe Temperaturen an der Oberfläche erforderlich, um einen ausreichenden Wärmefluss erzeugen zu können. Daher liegt ein weiterer Vorteil des neuen Verfahrens darin, dass die in Holz auftretenden Temperaturen auf die für einen Schleifvorgang günstigen Werte gehalten werden können. Wichtig ist, dass die Erweichung des Lignins weit genug fortgeschritten ist, so dass das Herauslösen der Fasern mit möglichst wenig Faserkürzung und möglichst wenig Feinstofferzeugung (Mehlstoffe) von statten geht. Eine höhere Erwärmung, insbesondere über 100° C, mag zwar die Ligninerweichung begünstigen, dafür treten aber andere Nachteile auf, wie z.B. ein erhöhter Weißgradverlust. Außerdem sind bei solchen Temperaturen Apparaturen erforderlich, die unter Überdruck stehen, also einen höheren Druck als die Umgebung haben, was nicht nur apparativ teurer ist, sondern auch höhere Betriebskosten und ein höheres Sicherheitsrisiko nach sich zieht.The usual warming of the Wood material, e.g. by vapor condensation on the surface and heat conduction inside the wood material, makes relatively high temperatures the surface required, for a sufficient heat flow to be able to produce. Therefore, another advantage of the new method is that the temperatures occurring in wood on the favorable for a grinding process Values can be kept. Important is that the softening of lignin has progressed far enough is, so the leaching out the fibers with as possible little fiber reduction and as possible little production of fines (flour substances) is done. A higher heating, especially over 100 ° C, although likes promote lignin softening, kick for it but other disadvantages, such as an increased loss of whiteness. Besides, they are At such temperatures apparatuses are required which are under overpressure stand, so a higher pressure as the environment have, which is not only expensive in terms of equipment, but also higher Operating costs and a higher one Security risk.
Ideal ist auch die relativ kurze Zeit, in der die für das Schleifen günstigen Temperaturen auf den Holz- und Faserstoff einwirken. Es ist nämlich davon auszugehen, dass die mögliche Schädigung des Fasermaterials (Weißgrad- und Festigkeitsverluste) nicht allein von der Temperatur, sondern auch von der Einwirkdauer abhängt.ideal is also the relatively short time in which the favorable for the grinding Temperatures on the wood and pulp interact. It must be assumed that the possible damage of the fiber material (whiteness and strength losses) not only from the temperature, but also depends on the duration of action.
Insgesamt führt das Verfahren zu längeren mechanisch festeren Holzschlifffasern und weniger Ausschuss. Die so hergestellten Fasern können mit Vorteil bei der Erzeugung von Schreib- und Druckpapieren eingesetzt werden. Eine andere mögliche Verwendung ist die Kartonherstellung, insbesondere da die Fasersteifigkeit ein hohes spezifisches Volumen bringt.All in all does that Procedure to longer mechanical firmer wood pulp fibers and less rejects. The so produced Fibers can used with advantage in the production of writing and printing papers become. Another possible Use is the paperboard production, especially as the fiber stiffness brings a high specific volume.
Die Erfindung und ihre Vorteile werden erläutert an Hand von Zeichnungen. Dabei zeigen:The The invention and its advantages are explained with reference to drawings. Showing:
Die
Die Temperatur des Holzmaterials steigt durch die mechanische Energie beim Schleifen weiter an, wodurch das Lignin noch stärker erweicht. Dieser – kurzzeitige – Anstieg ist also für das schonende Herauslösen der Fasern von Vorteil, ohne dass Nachteile eines Weißeverlustes in Kauf genommen werden müssen.The Temperature of the wood material increases due to the mechanical energy when grinding on, causing the lignin softened even more. This - short-term - increase is for the gentle release the fibers of advantage, without the disadvantages of a white loss must be accepted.
Der
Stetigschleifer der
Claims (12)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200610037697 DE102006037697A1 (en) | 2006-08-11 | 2006-08-11 | Method for production of ground wood, comprises mechanically separating ground wood fibers individually/in groups from circumference of tree-trunk, and carrying out separating tool in circumferential direction of tree-trunk |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200610037697 DE102006037697A1 (en) | 2006-08-11 | 2006-08-11 | Method for production of ground wood, comprises mechanically separating ground wood fibers individually/in groups from circumference of tree-trunk, and carrying out separating tool in circumferential direction of tree-trunk |
Publications (1)
Publication Number | Publication Date |
---|---|
DE102006037697A1 true DE102006037697A1 (en) | 2008-02-21 |
Family
ID=38954704
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE200610037697 Withdrawn DE102006037697A1 (en) | 2006-08-11 | 2006-08-11 | Method for production of ground wood, comprises mechanically separating ground wood fibers individually/in groups from circumference of tree-trunk, and carrying out separating tool in circumferential direction of tree-trunk |
Country Status (1)
Country | Link |
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DE (1) | DE102006037697A1 (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3015722A1 (en) * | 1980-04-24 | 1981-10-29 | J.M. Voith Gmbh, 7920 Heidenheim | DEVICE FOR PRODUCING WOOD GRIND |
DE3325049A1 (en) * | 1983-05-20 | 1984-11-22 | J.M. Voith Gmbh, 7920 Heidenheim | Process and device for controlling a wood grinder |
DD219514A1 (en) * | 1983-11-21 | 1985-03-06 | Juergen Blechschmidt | TWO-STAGE PROCESS FOR PRODUCING WOODEN SLIP |
AT385293B (en) * | 1982-07-06 | 1988-03-10 | Freiberg Papier Maschwerke | METHOD FOR PRODUCING WOODEN GRIND WITH CERTAIN STRENGTH PROPERTIES |
US20040238134A1 (en) * | 2001-11-09 | 2004-12-02 | Masood Akhtar | Microwave pre-treatment of logs for use in making paper and other wood products |
-
2006
- 2006-08-11 DE DE200610037697 patent/DE102006037697A1/en not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3015722A1 (en) * | 1980-04-24 | 1981-10-29 | J.M. Voith Gmbh, 7920 Heidenheim | DEVICE FOR PRODUCING WOOD GRIND |
AT385293B (en) * | 1982-07-06 | 1988-03-10 | Freiberg Papier Maschwerke | METHOD FOR PRODUCING WOODEN GRIND WITH CERTAIN STRENGTH PROPERTIES |
DE3325049A1 (en) * | 1983-05-20 | 1984-11-22 | J.M. Voith Gmbh, 7920 Heidenheim | Process and device for controlling a wood grinder |
DD219514A1 (en) * | 1983-11-21 | 1985-03-06 | Juergen Blechschmidt | TWO-STAGE PROCESS FOR PRODUCING WOODEN SLIP |
US20040238134A1 (en) * | 2001-11-09 | 2004-12-02 | Masood Akhtar | Microwave pre-treatment of logs for use in making paper and other wood products |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
OP8 | Request for examination as to paragraph 44 patent law | ||
R119 | Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee |
Effective date: 20110301 |