EP0318528B1 - Process for treating freshly cut timber - Google Patents

Process for treating freshly cut timber Download PDF

Info

Publication number
EP0318528B1
EP0318528B1 EP88903339A EP88903339A EP0318528B1 EP 0318528 B1 EP0318528 B1 EP 0318528B1 EP 88903339 A EP88903339 A EP 88903339A EP 88903339 A EP88903339 A EP 88903339A EP 0318528 B1 EP0318528 B1 EP 0318528B1
Authority
EP
European Patent Office
Prior art keywords
wood
drying
moisture
earth metal
spraying
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
Application number
EP88903339A
Other languages
German (de)
French (fr)
Other versions
EP0318528A1 (en
Inventor
György ERDÖSI
László BALINT
Péter OSVATH
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Agaton Sa Te Fribourg Zwitserland
Original Assignee
TOP-COOP IDEGENFORGALMI ES VENDEGLATOIPARI KISSZOEVETKEZET
Top-Coop Idegenforgalmi es Vendeglatoipari Kisszovetkezet
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by TOP-COOP IDEGENFORGALMI ES VENDEGLATOIPARI KISSZOEVETKEZET, Top-Coop Idegenforgalmi es Vendeglatoipari Kisszovetkezet filed Critical TOP-COOP IDEGENFORGALMI ES VENDEGLATOIPARI KISSZOEVETKEZET
Priority to AT88903339T priority Critical patent/ATE65206T1/en
Publication of EP0318528A1 publication Critical patent/EP0318528A1/en
Application granted granted Critical
Publication of EP0318528B1 publication Critical patent/EP0318528B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
    • B27K3/16—Inorganic impregnating agents
    • B27K3/18—Compounds of alkaline earth metals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
    • B27K3/16—Inorganic impregnating agents
    • B27K3/32—Mixtures of different inorganic impregnating agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
    • B27K5/001—Heating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
    • B27K5/06—Softening or hardening of wood

Definitions

  • the invention relates to a method for treating fresh wood, in the course of which the wood prepared for drying, e.g. Lumber, is dried in a drying room in a known manner at a temperature between 40 ° C and 100 ° C to at least 30% moisture content.
  • the aim of the process according to the invention is to remedy the deficiencies mentioned and to create a drying process which, in comparison with the previous drying methods, reduces the wood deformations, shape and dimension deviations, the tensions remaining therein and the duration of the drying process to an acceptable minimum.
  • Part of the gases in the air combine in the course of a reaction to form oxide, which converts to acid in the water and is able to release the alkaline earth metal built in during the growth of the wood, if we add a salt thereof with a distilled aqueous one Use the solution as a catalyst to accelerate the effect of this acid.
  • the process is therefore a "laboratory" imitation of the natural drying process, i.e. an artificial maximum acceleration of all known environmental effects.
  • the essence of the invention is that a nitric acid is mixed into the distilled aqueous solution of the alkali metal salt and the mixture thus obtained is injected into the drying room at least once. With this spray, the hard pectin is loosened, which is in the fibers of the wood and hinders the removal of moisture, whereby the alkali earth metal builds up between the wood fibers.
  • the composition of the mixture to be injected is as follows: nitric acid (HNO3) 42-48% by weight, distilled water (H2O) 42-48% by weight, alkali metal salt, e.g. Calcium chloride (CaCl2) 4-16% by weight.
  • concentration of the nitric acid can be between 65-96%.
  • This process enables the dry wood obtained in the course of the artificial drying process carried out in a few days to have the same properties as the wood naturally dried in a few years.
  • This method also enables the material to be made plasticizable and machinable without cutting (e.g. bendable, rotatable, compressible, stretchable, can be broken down into fibers, etc.) by reinforcing the natural chemical process, with relatively low wood moisture, and thus it can during growth be shaped almost like a living tree within the known limits or while maintaining most of its value.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

In a process for treating freshly cut timber, during which the raw timber prepared for drying, e.g. sawn timber, is dried in a known manner in a drying chamber at a temperature between 40 and 100°C until a moisture content of at least 30 % is attained, a solution of a salt of an alkaline earth metal in distilled water is mixed with nitric acid and the resultant solution is sprayed at least once into the drying chamber. This sprayed product softens the hard pectin present in the wood fibres which prevents the escape of moisture and at the same time the salt of the alkaline earth metal is incorporated between the wood fibres.

Description

Die Erfindung betrifft ein Verfahren zur Behandlung von Frischholz, im Laufe dessen das zur Trocknung vorbereitete Holz, z.B. Schnittholz, in einem Trockenraum auf an sich bekannte Weise bei einer Temperatur zwischen 40°C und 100°C bis auf mindestens 30% Feuchtigkeitsgehalt getrocknet wird.The invention relates to a method for treating fresh wood, in the course of which the wood prepared for drying, e.g. Lumber, is dried in a drying room in a known manner at a temperature between 40 ° C and 100 ° C to at least 30% moisture content.

Wie bekannt, werden die in der Holzindustrie zwecks Weiteranwendung hergestellten Primärprodukte (verschiedene Schnittmaterialien, Furniere und Holzspäne) zur Zeit in jedem Fall mit einem Feuchtigkeitsgehalt über der Fasersättigungsgrenze produziert. In diesem Zustand ist das Holz zur Weiterverarbeitung bzw. zur Formung nicht geeignet, deswegen ist es nötig, auf natürlichem oder künstlichem Wege den Feuchtigkeitsgehalt unter die Fasersättigungsgrenze, auf lufttrockenen (12-18%) oder auf zimmertrockenen (6-12%) Zustand zu senken.As is known, the primary products manufactured in the wood industry for further use (various cut materials, veneers and wood chips) are currently always produced with a moisture content above the fiber saturation limit. In this state, the wood is not suitable for further processing or shaping, which is why it is necessary to naturally or artificially reduce the moisture content below the fiber saturation limit, to air-dry (12-18%) or to room-dry (6-12%) reduce.

Infolge des raschen Anstiegs der industriellen Anwendung bzw. der Notwendigkeit der Herstellung von zimmertrockenen Bestandteilen wurde es unerlässlich, das natürliche Trockenverfahren, welches mindestens 2-5 Jahre lang dauert, künstlich zu beschleunigen, d.h. verschiedene künstliche Trocknungsprozesse anzuwenden.As a result of the rapid increase in industrial use or the need to manufacture room dry ingredients, it has become imperative to artificially accelerate the natural drying process, which takes at least 2-5 years, i.e. use various artificial drying processes.

Da die Beschleunigung der natürlichen Vorgänge in unveränderter Form (Temperatur, Wind, Feuchtigkeitsgehalt) zu keinem Ergebnis führte, wurden verschiedene Methoden zur möglichst schnelleren und schonenderen Extraktion der Holzfeuchtigkeit angewendet, die fast ausnahmslos auf die Aenderung der Eigenschaften und Parameter der Umweltluft (Temperatur, Bewegungsgeschwindigkeit, Druck, Feuchtigkeitsgehalt) beruhten (eine Ausnahme ist die Hochfrequenz-Trocknung, wo der Prozess der Feuchtigkeitsströmung von innen beginnt).Since the acceleration of the natural processes in unchanged form (temperature, wind, moisture content) did not lead to any result, various methods for the fastest and gentler extraction of wood moisture were used, which almost without exception relate to the change in the properties and parameters of the ambient air (temperature, speed of movement , Pressure, moisture content) (an exception is high frequency drying, where the process of moisture flow begins from the inside).

Die zur Zeit bekannten Methoden bzw. Verfahren sind die folgenden:

  • Konvektionsverfahren,
  • Kondensationsverfahren,
  • Vakuumverfahren,
  • Hochfrequenzverfahren und
  • Trocknung in heissem Öl.
The currently known methods and procedures are as follows:
  • Convection method,
  • Condensation process,
  • Vacuum process,
  • High frequency method and
  • Drying in hot oil.

In der Praxis werden die drei zuerst genannten Methoden angewendet. Mit diesen drei Methoden kann der gewünschte Holzfeuchtigkeitsgehalt mittels zeitlicher und räumlicher Änderung der verschiedenen Parameter erreicht werden. Im Vergleich mit der natürlichen Trocknung besteht die schnellere sog.Trockenholzherstellung (Trocknung) im allgemeinen aus folgenden drei Hauptphasen:

  • Anheizung (bzw. Anwärmung)
  • Trocknung
  • Ausgleichung (und Abstehenlassen, Kühlung).
In practice, the first three methods are used. With these three methods, the desired wood moisture content can be achieved by changing the various parameters over time and space. Compared to natural drying, the faster so-called dry wood production (drying) generally consists of the following three main phases:
  • Heating (or heating)
  • Drying
  • Equalization (and letting stand, cooling).

Der Feuchtigkeitsgehalt des mit den zur Zeit bekannten Methoden getrockneten Holzmaterials kann zwar auf das gewünschte Niveau eingestellt werden, aber

  • die makroskopischen Eigenschaften und Fehler des Holzmaterials führen zur Ungenauigkeit des erreichten Wertes (in allgemeinen in einer Grössenordnung zwischen 1-5%).
  • das Holz wird in Laufe des Trocknungsprozesses wegen des "erzwungenen" Feuchtigkeitsentzuges verschiedenartig deformiert (Krümmung, Verwerfung, Rissbildung, usw.)
  • während der Trocknung entstehen im Holzmaterial Spannungen verschiedener Art und verschiedenen Maßes und diese bleiben auch während der Verarbeitungszeit weiter bestehen, wobei sich wieder neue Krümmungen und Verwerfungen ausbilden.
  • das getrocknete Material ändert seine Form und Grösse in wesentlich grösserem Maße  ―  infolge der Änderungen der Umweltfeuchtigkeit während der Erreichung des Holzfeuchtigkeits-Gleichgewichtes und infolge anderer Feuchtigkeitsmodifizierungen (z.B. Befeuchtung)  ―  als das auf natürlichem Wege getrocknete Holzmaterial.
The moisture content of the wood material dried using currently known methods can be adjusted to the desired level, but
  • The macroscopic properties and defects of the wood material lead to the inaccuracy of the value reached (generally in the order of magnitude between 1-5%).
  • the wood is deformed in various ways in the course of the drying process due to the "forced" removal of moisture (curvature, warping, cracking, etc.)
  • During the drying process, tensions of various types and dimensions arise in the wood material, and these persist even during the processing time, with new curvatures and distortions forming again.
  • the dried material changes its shape and size to a much greater extent - as a result of the changes in the environmental humidity when the wood moisture balance is reached and as a result of other moisture modifications (eg moistening) - than the naturally dried wood material.

Das Ziel des erfindungsgemässen Verfahrens besteht in der Behebung der erwähnten Mängel und in der Schaffung eines Trocknungsverfahrens, das im Vergleich mit den bisherigen Trocknungsmethoden die Holzdeformationen, Form- und Abmessungsabweichungen, die darin zurückbleibenden Spannungen sowie die Zeitdauer des Trocknungsprozesses auf ein akzeptierbares Minimum vermindert.The aim of the process according to the invention is to remedy the deficiencies mentioned and to create a drying process which, in comparison with the previous drying methods, reduces the wood deformations, shape and dimension deviations, the tensions remaining therein and the duration of the drying process to an acceptable minimum.

Bei der Ausarbeitung des erfindungsgemässen Verfahrens haben wir uns auf die bisherigen Erfahrungen und auf die bereits praktizierten Methoden gestützt und haben diese mit den bisher nicht beachteten chemischen Prozessen ergänzt, die im Laufe der natürlichen Trocknung auch bisher einen bedeutenden Einfluss ausgeübt haben. So kann jede Trocknungstechnologie (Konvektions- Kondensations- und Vakuumtechnologie) auf Grund des folgenden Grundprizipes ergänzt bzw. modifiziert werden:When working out the method according to the invention, we have based on previous experience and on the methods already practiced and have supplemented these with the chemical processes which have not been considered so far and which have also had a significant influence in the course of natural drying. Every drying technology (convection, condensation and vacuum technology) can be supplemented or modified based on the following basic principle:

Ein Teil der in der Luft befindlichen Stoffe baut sich während des Wachsens in das Material des Holzes ein, der andere Teil beeinflusst die Entwicklung und die natürliche Widerstandsfähigkeit. Wird nun dieser natür liche Vorgang während der künstlichen Trocknung in entgegengesetzter Richtung und beschleunigt angewendet, kann der effektiven und beschleunigten Imitation der natürlichen Trocknung ― mit der wesentlich bessere Ergebnisse erzielt werden können ― näher gekommen werden.Part of the substances in the air builds into the material of the wood during growth, the other part influences the development and the natural resistance. Now this natural process applied during the artificial drying in the opposite direction and accelerated, the effective and accelerated imitation of natural drying - with which much better results can be achieved - can be approached.

In den Phasen des Verfahrens, wo die bisherigen Methoden die verschiedenen feuchteren und trockeneren Zeitperioden imitierend die Gleichgewichtsfeuchtigkeit des Holzmaterials beeinflussen und den erwünschten Trocknungsgrad sichern, wird im Laufe der dabei angewendeten Befeuchtung (Brüdenzuführung, Besprühung, Bespritzung) erfindungsgemäss ein chemisches Präparat in solcher Zusammensetzung und Konzentration angewendet, dessen Wirkung auch während der Naturvorgänge zur Geltung kommt.In the phases of the process, where the previous methods mimic the different humid and drier periods of time to imitate the equilibrium moisture of the wood material and ensure the desired degree of dryness, a chemical preparation in such a composition and according to the invention is used in the course of the humidification used (vapor supply, spraying, spraying) Concentration applied, the effect of which also comes into play during natural processes.

Ein Teil der in der Luft befindlichen Gase vereinigt sich im Laufe einer Reaktion zu Oxyd, das sich im Wasser in Säure umwandelt und imstande ist, das während des Wachsens des Holzes eingebaute Alkali-Erdmetall auszulösen, falls wir ein Salz desselben zusammen mit einer destillierten wässrigen Lösung als Katalisator verwenden, um die Wirkung dieser erwähnten Säure zu beschleunigen.Part of the gases in the air combine in the course of a reaction to form oxide, which converts to acid in the water and is able to release the alkaline earth metal built in during the growth of the wood, if we add a salt thereof with a distilled aqueous one Use the solution as a catalyst to accelerate the effect of this acid.

Unser Verfahren imitiert also neben den bisher bekannten beeinflussenden Faktoren (Temperatur, Feuchtigkeitsgehalt, Druck, Luftgeschwindigkeit) die chemische Wirkung der Umwelt. Damit wird die molekularstruktur des Holzes in dem kritischen Zeitpunkt von dem verhärteten Zustand des Pektins aufgelockert, wodurch ermöglicht wird, dass der innere Feuchtigkeitsgehalt störungslos an die Oberfläche gelangt und sich von dort entfernt, danach baut sich das Alkali-Erdmetall mit Hilfe des Katalysators in die natürliche Substanz ein.In addition to the previously known influencing factors (temperature, moisture content, pressure, air speed), our process imitates the chemical effects of the environment. This loosens the molecular structure of the wood at the critical point in time from the hardened state of the pectin, which enables the internal moisture content to reach and move away from the surface without problems, after which the alkali earth metal is built into the with the help of the catalyst natural substance.

Das Verfahren ist also eine "Labor"-Nachahmung des natürlichen Trocknungspruzesses, d.h. eine künstliche Maximalbeschleunigung aller heute bekannten Wirkungen der Umwelt.The process is therefore a "laboratory" imitation of the natural drying process, i.e. an artificial maximum acceleration of all known environmental effects.

Das Wesen der Erfindung besteht darin, dass der destillierten wässrigen Lösung des Alkalimetall-Salzes eine Salpetersäure zugemischt wird und die so gewonnene Mischung wenigstens einmal in den Trockenraum eingespritzt wird. Mit diesem Spritzmittel wird das Hartpektin aufgelockert, das sich in den Fasern des Holzes befindet und die Entfernung der Feuchtigkeit behindert, dabei baut sich das Alkali- Erdmetall zwischen die Holzfasern ein.The essence of the invention is that a nitric acid is mixed into the distilled aqueous solution of the alkali metal salt and the mixture thus obtained is injected into the drying room at least once. With this spray, the hard pectin is loosened, which is in the fibers of the wood and hinders the removal of moisture, whereby the alkali earth metal builds up between the wood fibers.

Gemäss einem Ausführungsbeispiel der Erfindung ist die Zusammensetzung der einzuspritzenden Mischung wie folgt: Salpetersäure (HNO₃) 42-48 Gew.%, destilliertes Wasser (H₂O) 42-48 Gew.%, Alkalimetall-Salz, z.B. Kalziumchlorid (CaCl₂) 4-16 Gew.%. Gemäss einem Ausführungsbeispiel kann die Konzentration der Salpetersäure zwischen 65-96% liegen.According to one embodiment of the invention, the composition of the mixture to be injected is as follows: nitric acid (HNO₃) 42-48% by weight, distilled water (H₂O) 42-48% by weight, alkali metal salt, e.g. Calcium chloride (CaCl₂) 4-16% by weight. According to one embodiment, the concentration of the nitric acid can be between 65-96%.

Das erfindungsgemässe Verfahren wird nachstehend anhand eines Ausführungsbeispiels näher erläutert.The method according to the invention is explained in more detail below using an exemplary embodiment.

Nach Anwendung der bisherigen Erfahrungsdaten sind die wichtigsten Parameter des in der Erfindung angegebenen Trocknungsverfahrens die folgenden:

Figure imgb0001
After applying the previous experience data, the most important parameters of the drying process specified in the invention are the following:
Figure imgb0001

Anwendung von Chemikalien während der Brüdenzuführung in den verschiedenen Phasen der Anheizung, Trocknung und Ausgleichung zwischen 30-8% Gleichgewicht- Holzfeuchtig- keitsgehalt, das Einspritzen  ―  abhängig von der Holzart  ―  während einer Zeitdauer von 2 bis 15 Minuten vorzunehmen, während die Zahl der Einspritzungszyklen  ―  abhängig von der Holzart ―  zwischen 1 und 10 gewählt wird.Use of chemicals during the vapor supply in the various phases of heating, drying and balancing between 30-8% equilibrium - wood moisture content, the injection - depending on the type of wood - to be carried out for a period of 2 to 15 minutes, while the number of injection cycles - depending on the type of wood - between 1 and 10 is selected.

Dieses Verfahren ermöglicht, dass das im Laufe des in einigen Tagen durchgeführten künstlichen Trocknungsprozesses gewonnene Trockenholz dieselben Eigenschaften hat, wie das in einigen Jahren auf natürlichem Wege getrocknete Holz. Dieses Verfahren ermöglicht ebenfalls, dass durch Verstärkung des natürlichen chemischen Prozesses, bei verhältnissmässig niedriger Holzfeuchtigkeit das Material plastizierbar und spanlos bearbeitbar gemacht werden kann (z.B. biegbar, drehbar, zusammendrückbar, dehnbar, in Fasern zerlegbar, usw.) und somit kann es während des Wachstums innerhalb der bekannten Grenzen bzw. unter Beibehaltung des grössten Teils seines Wertes beinahe wie ein lebender Baum geformt werden.This process enables the dry wood obtained in the course of the artificial drying process carried out in a few days to have the same properties as the wood naturally dried in a few years. This method also enables the material to be made plasticizable and machinable without cutting (e.g. bendable, rotatable, compressible, stretchable, can be broken down into fibers, etc.) by reinforcing the natural chemical process, with relatively low wood moisture, and thus it can during growth be shaped almost like a living tree within the known limits or while maintaining most of its value.

Die angeführten Nachteile, die bei den bekannten Verfahren auftreten, vermindern sich bei der Anwendung des erfindungsgemässen Verfahrens auf das Minimum, wie

  • a) im Laufe der Trocknung vermindern sich die aufgrund der makroskopischen Eigenschaften des Holzes entstehenden Form- und Massveränderungen auf das Minimum, weil eine künstliche Alterung hervorgerufen wird
  • b) es entstehen keine solchen Formänderungen, die nach den bekannten Trocknungsverfahren registriert werden können, d.h. Krümmung, Verwerfung und Risse schädigen das aufzuarbeitende Holzmaterial nicht
  • c) das getrocknete Holz ist spannungsfrei, deswegen entsteht während der Verarbeitung keine neue Wertveminderung, das Material kann vollwertig verbraucht werden
  • d) auch auf andere, bisher nicht ausgenützte Gebiete kann die Anwendung erweitert werden, z.B. ermöglicht es die spanlose Formung von bisher als unbiegsam vermuteten Holzmaterialien und die gestaltungsfähige Formung ohne durch Temperatur verursachte Beschädigung
  • e) die wegen der Beschleunigung der Umlaufgeschwindigkeit des Verbrauchs (Verhältnis des Wachstums zum Verbrauch) entstandenen Probleme, dass die aus Holz hergestellten Bestandteile mit grösserer Holzfeuchtigkeit als zugelassen eingebau werden un die spätere Änderung derselben (Form-, Massänderung-, usw.) weitere Beschädigungen verursacht, werden eliminiert.
The disadvantages mentioned, which occur in the known methods, are reduced to a minimum when using the method according to the invention, such as
  • a) in the course of drying, the shape and size changes resulting from the macroscopic properties of the wood are reduced to a minimum, because artificial aging is caused
  • b) there are no such changes in shape that can be registered according to the known drying processes, ie curvature, warping and cracks do not damage the wood material to be processed
  • c) the dried wood is tension-free, so there is no new reduction in value during processing Material can be fully used
  • d) the application can also be extended to other, previously unexploited areas, for example the chipless shaping of wood materials previously assumed to be inflexible and the shapeable shaping without damage caused by temperature
  • e) the problems that have arisen because of the acceleration of the circulation speed of consumption (ratio of growth to consumption), that the components made of wood with greater wood moisture than permitted are installed and the subsequent change in them (shape, size change, etc.) further damage caused are eliminated.

Claims (6)

1. Method for processing fresh wood, during which the rough wood prepared for seasoning, e.g. cut wood, is seasoned within a drying chamber, in a way which is known per se, at a temperature of between 40°C and 100°C until a moisture content of at least 30% is obtained, characterized in that nitric acid is admixed to a destilled water solution of an alkaline-earth metal salt and the mixture obtained thereby is sprayed at least once into the drying chamber, wherein by this spraying agent the hard pectin within the fibres of the wood which hinders the escape of moisture is loosened and the alkaline-earth metal inserts itself between the wood fibres.
2. Method according to claim 1, characterized in that the composition of the mixture to be sprayed into the chamber is chosen as follows: Nitric acid (HNO₃) 42-48 per cent by weight, destilled water (H₂O) 42-48 per cent by weight, alkaline-earth metal salt, e.g. calcium chloride (CaCl₂) 4-16 per cent by weight.
3. Method according to claim 1 or 2, characterized in that the concentration of nitric acid is formed in between 65% and 96%.
4. Method according to one of the claims 1 to 3, characterized in that before spraying, the moisture of wood  ―  depending on the kind of wood  ―  is adjusted to between 18% and 30%.
5. Method according to one of the claims 1 to 4, characterized in that the inner temperature of the drying chamberafter the spraying is kept in between a value of 40°C and 100°C during the drying process.
6. Method according to one of the claims 1 to 5, characterized in that the spraying  ―  depending on the kind of wood  ―  is made within a period of 2 to 15 minutes, while the number of spraying cycles  ―  depending on the kind of woods  ―  is chosen between 1 and 10.
EP88903339A 1987-05-04 1988-04-20 Process for treating freshly cut timber Expired - Lifetime EP0318528B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88903339T ATE65206T1 (en) 1987-05-04 1988-04-20 METHOD OF TREATMENT OF GREEN WOOD.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
HU871983A HU199088B (en) 1987-05-04 1987-05-04 Method for treating raw timbers
HU198387 1987-05-04

Publications (2)

Publication Number Publication Date
EP0318528A1 EP0318528A1 (en) 1989-06-07
EP0318528B1 true EP0318528B1 (en) 1991-07-17

Family

ID=10957150

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88903339A Expired - Lifetime EP0318528B1 (en) 1987-05-04 1988-04-20 Process for treating freshly cut timber

Country Status (9)

Country Link
US (1) US4977686A (en)
EP (1) EP0318528B1 (en)
BR (1) BR8807042A (en)
CS (1) CS277182B6 (en)
DD (1) DD272628A1 (en)
HU (1) HU199088B (en)
PL (1) PL155814B1 (en)
RO (1) RO105398B1 (en)
WO (1) WO1988008780A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0206970D0 (en) * 2002-03-25 2002-05-08 Nutrel Products Ltd Delivery system
FI20041448A0 (en) * 2004-11-10 2004-11-10 Tekmawood Oy Procedure and apparatus for protecting timber
JP2011189515A (en) * 2010-03-11 2011-09-29 Olympus Corp Method of manufacturing compressed wood product
DE102013223415A1 (en) * 2013-11-15 2015-05-21 Holzwerke Gmach GmbH Method of artificial wood aging

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1855666A (en) * 1930-04-12 1932-04-26 Leo P Curtin Process of preserving wood
US2500954A (en) * 1947-03-04 1950-03-21 Us Agriculture Method involving the use of chemicals for increasing the drying rate of wood
CH485616A (en) * 1964-02-13 1970-02-15 Lonza Werke Gmbh Process for the production of ceramic-bonded refractory bodies
DE2460392A1 (en) * 1974-12-20 1976-06-24 Wilke Klaus Diether Incombustible chipboard prodn using magnesium cpds - by treating with chloride soln., caustic oxide, sulphate soln. and oxide powder

Also Published As

Publication number Publication date
RO105398B1 (en) 1994-12-21
HU199088B (en) 1990-01-29
BR8807042A (en) 1989-10-03
US4977686A (en) 1990-12-18
DD272628A1 (en) 1989-10-18
CS277182B6 (en) 1992-12-16
WO1988008780A1 (en) 1988-11-17
PL155814B1 (en) 1992-01-31
PL272246A1 (en) 1989-05-16
EP0318528A1 (en) 1989-06-07
CS8802854A2 (en) 1991-07-16

Similar Documents

Publication Publication Date Title
DE102008006071A1 (en) Method of drying wood, method of impregnating wood with chemicals and drying device
DE60210661T2 (en) METHOD FOR PRODUCING NON-BURNABLE WOOD
EP0318528B1 (en) Process for treating freshly cut timber
DE2943373A1 (en) PROCEDURE FOR REORDERING OR RE-MOISTURIZING EXPANDED TOBACCO
EP1123787B1 (en) Process for the protection of wooden pallets from fungal attack
CH362905A (en) Process for coating solid products with a coating containing an agent inhibiting the growth of microorganisms
DE3106158A1 (en) "METHOD FOR PREPARING PRE-COOKED PASTA AND SO PREPARED PASTA"
DE602004001449T2 (en) METHOD FOR TREATING A WOODEN ELEMENT
DE2028377C3 (en) Process for shaping or pressing wood
DE2857355A1 (en) METHOD FOR THE MICROBIOLOGICAL CHANGING OF PRESENT WOOD BY THE ACTION OF MICROORGANISMS
DE2263758C3 (en) Process for the production of dimensionally stable wood and wood products made from it, e.g. veneers, chips
DE2263029C3 (en) Process for drying and refining timber
EP1862278A1 (en) Facility, method and impregnating medium for treating renewable raw materials (wood) and cellulose ligated plants
CH681439A5 (en)
DE878553C (en) Method of treating wood
DE898803C (en) Process for impregnating beech wood
DE878840C (en) Agent for impregnating wood and other organic materials
DE872860C (en) Process for finishing wood
DE676786C (en) Process for protecting dry wood against fire, rot, insects
DE3142506C2 (en) Wood preservatives and processes for preserving wood and their uses
DE921231C (en) Process for the production of parquet wood from beech wood
AT204838B (en) Process for preserving natural plants, flowers and leaves
DE815617C (en) Method and device for surface treatment of mass articles made of wood
DD216476A1 (en) COLORED WOOD PROTECTIVE PAINTINGS
DE165540C (en)

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

17P Request for examination filed

Effective date: 19890516

17Q First examination report despatched

Effective date: 19900801

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

REF Corresponds to:

Ref document number: 65206

Country of ref document: AT

Date of ref document: 19910815

Kind code of ref document: T

REF Corresponds to:

Ref document number: 3863762

Country of ref document: DE

Date of ref document: 19910822

ET Fr: translation filed
ITF It: translation for a ep patent filed
GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19920413

Year of fee payment: 5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19920430

Year of fee payment: 5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19920518

Year of fee payment: 5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19920522

Year of fee payment: 5

Ref country code: FR

Payment date: 19920522

Year of fee payment: 5

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: LU

Payment date: 19920526

Year of fee payment: 5

Ref country code: AT

Payment date: 19920526

Year of fee payment: 5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 19920604

Year of fee payment: 5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19920630

Year of fee payment: 5

26N No opposition filed
REG Reference to a national code

Ref country code: CH

Ref legal event code: PUE

Owner name: AGATON S.A.

REG Reference to a national code

Ref country code: GB

Ref legal event code: 732

EPTA Lu: last paid annual fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19930420

Ref country code: GB

Effective date: 19930420

Ref country code: AT

Effective date: 19930420

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19930421

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19930430

Ref country code: CH

Effective date: 19930430

Ref country code: BE

Effective date: 19930430

NLS Nl: assignments of ep-patents

Owner name: AGATON S.A. TE FRIBOURG, ZWITSERLAND.

REG Reference to a national code

Ref country code: FR

Ref legal event code: TP

BERE Be: lapsed

Owner name: S.A. AGATON

Effective date: 19930430

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19931101

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19930420

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19931229

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19940101

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

EUG Se: european patent has lapsed

Ref document number: 88903339.5

Effective date: 19931110

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20050420