EP0199092A1 - Process for the accelerated fixation of chromate-containing wood preservative salts - Google Patents
Process for the accelerated fixation of chromate-containing wood preservative salts Download PDFInfo
- Publication number
- EP0199092A1 EP0199092A1 EP86103757A EP86103757A EP0199092A1 EP 0199092 A1 EP0199092 A1 EP 0199092A1 EP 86103757 A EP86103757 A EP 86103757A EP 86103757 A EP86103757 A EP 86103757A EP 0199092 A1 EP0199092 A1 EP 0199092A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- chromate
- wood
- fixation
- woods
- heat treatment
- 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.)
- Withdrawn
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
- B27K1/00—Damping wood
-
- 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
- B27K3/02—Processes; Apparatus
- B27K3/0207—Pretreatment of wood before impregnation
- B27K3/0214—Drying
-
- 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
- B27K3/02—Processes; Apparatus
- B27K3/0278—Processes; Apparatus involving an additional treatment during or after impregnation
- B27K3/0292—Processes; Apparatus involving an additional treatment during or after impregnation for improving fixation
-
- 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
- B27K3/26—Compounds of iron, aluminium, or chromium
-
- 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
- B27K5/04—Combined bleaching or impregnating and drying of wood
Definitions
- the invention relates to a method for preventing or reducing the possible washing out of water-soluble, fixing protective salts immediately after impregnation.
- Spontaneous fixation is achieved in the outer wood area by exposure to superheated steam at 110 to 120 ° C for one hour.
- Another disadvantage of this process is the reduction in the concentration of protective agent in the outer wood area compared to normal fixing woods. This phenomenon is caused by two factors. On the one hand, active substances are removed from the wood surface with the dripping condensate, on the other hand, the quickly developing fixing zone acts as an inhibiting layer, which prevents the supply of active substances from the wood interior to the surface.
- the object of the present invention was therefore to avoid the serious disadvantages of the known superheated steam process.
- the method according to the invention for the accelerated fixing of chromate-containing wood preservatives provides for a two-stage treatment of the freshly impregnated woods with different heat carriers according to the features of claim 1.
- stage 1 the freshly impregnated wood stacks are warmed up until the temperature of the wood surface has risen to 60 to 100 ° C., preferably 80 to 95 ° C. Warming up can e.g. with hot air, hot exhaust gases, radiant heaters or IR lamps.
- stage II the heated wood stacks are brought to about 1100C with superheated steam, which temperature is then also to be held for about 30 minutes, according to known experience.
- the heat treatment can also be carried out in a conventional drying chamber, but a technically preferred solution is the use of a special fixing chamber that allows precise control of the two process phases.
- the condensate formation either does not take place at all or only comparatively small residual amounts of 0.2 to 0.5 m 2 (that is 5 to 15 of the normally occurring amounts of condensate) are present in the impregnation vessel.
- the analyzes of the amounts of active substance in the marginal zone ⁇ showed no significant differences to normal fixed, non-steamed comparison woods.
- the surface temperature of the pine masts dropped continuously to 58-65 ° C and the inside wall of the boiler to 60 to 64 ° C. After 30 minutes, the hot air treatment was interrupted, the boiler door was closed and superheated steam at 120 ° C. was fed into the boiler via the ventilation valves. After a further 10 minutes, the probes signaled an increase in the surface temperature on the pine masts to approximately 110 ° C., which was then held for a further 30 minutes.
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)
- Silver Salt Photography Or Processing Solution Therefor (AREA)
- Waveguide Switches, Polarizers, And Phase Shifters (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
Abstract
Verfahren zur beschleunigten Fixierung chromathaltiger Holzschutzsalze, bei dem frisch imprägnierte Hölzer einer Heißdampffixierung unterworfen werden, wobei die frisch imprägnierten Hölzer zuvor einer Wärmebehandlung unterliegen, bei der sowohl die Holzoberfläche, wie die Innenwände der Heizkammer auf 60-100°C, vorzugsweise 80-95°C aufgewärmt werden und anschließend in bekannter Weise die Hölzer mit überhitztem Dampf behandelt werden.Process for the accelerated fixing of chromate-containing wood protection salts, in which freshly impregnated woods are subjected to hot steam fixation, the freshly impregnated woods being subjected to a heat treatment beforehand, in which both the wooden surface and the inner walls of the heating chamber are at 60-100 ° C., preferably 80-95 ° C are warmed up and then the wood is treated in a known manner with superheated steam.
Description
Gegenstand der Erfindung ist ein Verfahren zur Verhinderung bzw. Verminderung einer möglichen Auswaschung von wasserlöslichen, fixierenden Schutzsalzen unmittelbar nach der Imprägnierung.The invention relates to a method for preventing or reducing the possible washing out of water-soluble, fixing protective salts immediately after impregnation.
Es ist bekannt, daß die wasserlöslichen Bestandteile von chromathaltigen Schutzsalzen erst im Laufe mehrerer Wochen sich in schwer auswaschbare Verbindungen umwandeln. Eine geschützte Lagerung während der Fixierungszeit wird inbesondere für Schnittholz und schwach dimensioniertes Rundholz nur selten durchgeführt. Bei Beregnung frisch imprägnierter Hölzer kann es zur Auswaschung der Wirkstoffe und der damit verbundenen Kontamination der Umwelt kommen. Zur Beschleunigung der Fixierung chromathaltiger Holzschutzsalze wird immer häufiger im Anschluß an eine Kesseldrucktränkung eine Heißdampfbehandlung vorgenommen.It is known that the water-soluble components of chromate-containing protective salts only change into compounds which are difficult to wash out over the course of several weeks. Protected storage during the fixation period is rarely carried out, especially for sawn timber and poorly dimensioned logs. When sprinkling freshly impregnated wood, the active ingredients can be washed out and the associated contamination of the environment. To accelerate the fixation of chromate-containing wood preservation salts, hot steam treatment is increasingly being carried out after a boiler pressure impregnation.
Durch einstündige Einwirkung mit überhitztem Dampf von 110 bis 120°C wird dabei in dem äußeren Holzbereich eine Spontanfixierung erzielt.Spontaneous fixation is achieved in the outer wood area by exposure to superheated steam at 110 to 120 ° C for one hour.
Als gravierender Nachteil dieses Verfahrens muß die Bildung von großen Mengen Kondensats angesehen werden. Bei den Bedampfungen entstehen durch Abkühlung des Heißdampfes am kalten Holz und an der Kesselwandung beachtliche Mengen (ca. 3,5 bis 4 m3 je Tränkcharge in einem Tränkkessel von 50 m3 Inhalt) von Kondensatwasser, das mit herausgewaschenen Schutzsalzmengen bis zu 0,5 Gew.7 verunreinigt ist. Wegen dieser Restmengen von Schutzsalz kann das Kondensat nicht ungereinigt in das Abwasser geleitet werden. Eine Rückführung in den Lagertank führt zu unerwünschten Verdünnung der Imprägnierlösung und vermehrter Schlammbildung, was auf die herausgewaschenen Holzinhaltsstoffe zurückzuführen ist. Ein weiterer Nachteil dieses Verfahrens ist die Verminderung der Schutzmittelanreicherung im äußeren Holzbereich im Vergleich zu normal fixierenden Hölzern. Dieses Phänomen wird von zwei Faktoren verursacht. Einerseits werden Wirkstoffe mit dem abtropfenden Kondensat der Holzoberfläche entzogen, andererseits wirkt sich die schnell herausbildende Fixierzone als eine Hemmschicht, die den Nachschub von noch mobilen Wirkstoffen aus dem Holzinnern an die Oberfläche unterbindet.The formation of large amounts of condensate must be regarded as a serious disadvantage of this process. During the steaming, the hot steam on the cold wood and on the wall of the boiler generates considerable amounts (approx. 3.5 to 4 m 3 per impregnation batch in an impregnation kettle of 50 m 3 content) of condensate water, which with washed-out amounts of protective salt amounts to up to 0.5 Gew.7 is contaminated. Because of these residual amounts of protective salt, the condensate cannot be discharged into the wastewater without being cleaned. A return to the storage tank leads to undesired dilution of the impregnation solution and increased sludge formation, which is due to the washed out wood contents. Another disadvantage of this process is the reduction in the concentration of protective agent in the outer wood area compared to normal fixing woods. This phenomenon is caused by two factors. On the one hand, active substances are removed from the wood surface with the dripping condensate, on the other hand, the quickly developing fixing zone acts as an inhibiting layer, which prevents the supply of active substances from the wood interior to the surface.
Die bisherigen Versuche zur Beseitigung der technischen Nachteile des Heißdampfverfahrens brachten keine brauchbaren Ergebnisse. Die naheliegende Erhöhung der Prozeßtemperatur, zwecks Verminderung der Kondensatbildung, führt zur starken Rißbildung bei Rundhölzern. Ähnliche Ergebnisse bringt der Umtausch des Wärmeträgers, in Form einer Heißluftbehandlung; im Bereich von über 100°C führt die damit verbundene Intensivtrocknung zum Aufplatzen stärker dimensionierter Hölzer.The previous attempts to eliminate the technical disadvantages of the superheated steam process have produced no useful results. The obvious increase in the process temperature in order to reduce the formation of condensate leads to severe crack formation in logs. The exchange of the heat transfer medium, in the form of a hot air treatment, brings similar results; in the range of over 100 ° C the associated intensive drying leads to the bursting of larger sized woods.
Ein Ausweichen auf eine schonendere Holzbehandlung durch einen Warmluftstrom von nur 60°C führt wiederum im Endeffekt zu einer stärkeren Schutzmittelauswaschung in den ersten Tagen nach der Fixierung. Die gemessenen Auswaschraten liegen dabei nicht nur wesentlich höher als bei der Heißdampffixierung, sondern auch höher als bei frisch imprägnierten Hölzern, die keiner zusätzlichen Wärmebehandlung unterworfen wurden. Eine Warmluftbehandlung von frisch imprägnierten Hölzern bewirkt damit gerade das Gegenteil des angetrebten Ziels. Die Ursache dafür liegt im schnellen Entzug des für die Fixierungsreaktion notwendigen Wassers.Switching to a gentler wood treatment by means of a warm air flow of only 60 ° C ultimately leads to more protective agent leaching in the first days after fixation. The measured wash-out rates are not only significantly higher than with hot steam fixation, but also higher than with freshly impregnated woods that have not been subjected to any additional heat treatment. A warm air treatment of freshly impregnated wood thus does exactly the opposite of the intended goal. The reason for this is the rapid withdrawal of the water necessary for the fixation reaction.
Aufgabe der vorliegenden Erfindung war es daher, die gravierenden Nachteile des bekannten Heißdampfverfahrens zu vermeiden.The object of the present invention was therefore to avoid the serious disadvantages of the known superheated steam process.
Das erfindungsgemäße Verfahren zur beschleunigten Fixierung chromathaltiger Holzschutzmittel sieht hierfür eine zweistufige Behandlung der frisch imprägnierten Hölzern mit unterschiedlichen Wärmeträgern gemäß den Merkmalen des Patentanspruchs 1 vor.The method according to the invention for the accelerated fixing of chromate-containing wood preservatives provides for a two-stage treatment of the freshly impregnated woods with different heat carriers according to the features of claim 1.
In der Stufe 1 werden die frisch imprägnierten Holzstapel trocken so lange aufgewärmt, bis die Temperatur der Holzoberfläche auf 60 bis 100°C, vorzugsweise 80 bis 95°C angestiegen ist. Das Aufwärmen kann z.B. mit Heißluft, heißen Abgasen, Heizstrahlgeräten oder IR-Lampen bewerkstelligt werden. In der Stufe II werden die aufgewärmten Holzstapel mit überhitztem Dampf auf etwa 1100C gebracht, welche Temperatur nach den bekannten Erfahrungen dann auch ca. 30 Minuten zu halten ist.In stage 1, the freshly impregnated wood stacks are warmed up until the temperature of the wood surface has risen to 60 to 100 ° C., preferably 80 to 95 ° C. Warming up can e.g. with hot air, hot exhaust gases, radiant heaters or IR lamps. In stage II, the heated wood stacks are brought to about 1100C with superheated steam, which temperature is then also to be held for about 30 minutes, according to known experience.
Die Wärmebehandlung kann auch in einer herkömmlichen Trockenkammer durchgezogen werden, eine technisch bevorzugte Lösung besteht aber in der Verwendung einer speziellen Fixierungskammer, die eine exakte Steuerung der beiden Verfahrensphasen erlaubt.The heat treatment can also be carried out in a conventional drying chamber, but a technically preferred solution is the use of a special fixing chamber that allows precise control of the two process phases.
Entsprechende Versuche haben ergeben, daß nach dem erfindungsgemäßen Verfahren die Kondensatbildung entweder überhaupt nicht stattfindet oder vergleichsweise nur geringe Restmengen von 0,2 bis 0,5 m2 (das sind 5 bis 15 der normalerweise anfallenden Kondensatmengen) im Tränkkessel vorhanden sind. Die Analysen der Wirkstoffmengen in den Randzone^ ergaben dabei keine wesentlichen Unterschiede zu normal fixierten, nicht bedampften Vergleichshölzern.Corresponding tests have shown that, according to the process according to the invention, the condensate formation either does not take place at all or only comparatively small residual amounts of 0.2 to 0.5 m 2 (that is 5 to 15 of the normally occurring amounts of condensate) are present in the impregnation vessel. The analyzes of the amounts of active substance in the marginal zone ^ showed no significant differences to normal fixed, non-steamed comparison woods.
Damit wurde die Möglichkeit zur Schnellfixierung von chromathaltigen Holzschutzsalzen geschaffen, ohne daß dabei eine Verminderung der Schutzfraktion des Imprägnates bzw. eine Entsorgung chromathaltiger Abwässer ins Gewicht fällt.This created the possibility of quick fixation of chromate-containing wood preserving salts without reducing the protective fraction of the impregnate or the disposal of chromate-containing waste water.
Das erfindungsgemäße Verfahren soll anhand folgender Praxisversuche erläutert werden.The method according to the invention will be explained using the following practical tests.
In einem Tränkkessel von 50 m3 Inhalt wurden 20 m3 Kiefernmasten mit einer 3,6 /igen Lösung eines CKB-Salzes herkömmlicherweise imprägniert. Durch die teilweise geöffnete Kammterür wurde danach eine flexible Warmluftleitung von Heizstrahlgerät bis ans Ende des Tränkkessels verlegt. Der Heißluftstrom umspülte die Kiefernmasten auf ihrer ganzen Länge und entwich zusammen mit dem Wasserdampf über den Türspalt. Nach ca. 30 Minuten Wärmebehandlung konnte über die verlegten Temperatursonden ein Anstieg der Oberflächentemperatur am hinteren Ende der Kiefernmasten auf 90 bis 95°C und der Kesselinnenwand auf 70 bis 76°C gemessen werden. In Richtung Kesseltür fiel die Oberflächentemperatur der Kiefernmasten kontinuierlich auf 58-65°C u nd der Kesselinnenwand auf 60 bis 64°C ab. Nach 30 Minuten wurde die Warmluftbehandlung unterbrochen, die Kesseltür geschlossen und über die Entlüftungsventile überhitzter Dampf von 120°C in den Kessel geleitet. Nach weiteren 10 Minuten signalisierten die Sonden einen Anstieg der Oberflächentemperatur an den Kiefernmasten auf ca. 110°C, die dann weitere 30 Minuten gehalten wurde.20 m 3 of pine masts were conventionally impregnated with a 3.6% solution of a CKB salt in a watering kettle of 50 m 3 content. A flexible warm air line from the radiant heater to the end of the drinking bowl was then installed through the partially opened comb door. The hot air stream washed the entire length of the pine masts and escaped along with the water vapor over the door gap. After approx. 30 minutes of heat treatment, an increase in the surface temperature at the rear end of the pine masts to 90 to 95 ° C and the inner wall of the boiler to 70 to 76 ° C could be measured using the installed temperature probes. Towards the boiler door, the surface temperature of the pine masts dropped continuously to 58-65 ° C and the inside wall of the boiler to 60 to 64 ° C. After 30 minutes, the hot air treatment was interrupted, the boiler door was closed and superheated steam at 120 ° C. was fed into the boiler via the ventilation valves. After a further 10 minutes, the probes signaled an increase in the surface temperature on the pine masts to approximately 110 ° C., which was then held for a further 30 minutes.
Nach Abschluß der Dampfbehandlung war die Holzoberfläche vollkommen trocken. Am Kesselboden waren geringe Mengen Kondensat vorhanden, die in etwa 0,2 m3 betrugen.When the steam treatment was finished, the wooden surface was completely dry. Small amounts of condensate were present on the bottom of the boiler, which amounted to about 0.2 m 3 .
In einem weiteren Versuch wurde unter gleichen Bedingungen das Verhalten einer 18 m3 großen Charge Fichtenrundholz überprüft. Nach einem ähnlichen Prozeßverlauf (der Anstieg der Holzoberflächentemperatur im hinteren Teil des Tränkkessels erfolgte ca. 5 Minuten schneller als im Beispiel I), war auch hier die Holzoberfläche trocken und die Kondensatbildung hat hier überhaupt nicht stattgefunden.In another experiment, the behavior of an 18 m 3 batch of round spruce wood was checked under the same conditions. After a similar process (the increase in the surface temperature of the wood in the rear part of the impregnation tank was about 5 minutes faster than in example I), the wood surface was dry and the condensation did not take place here at all.
Anhand der beiden Praxisversuche, die jeweils im Anschluß an eine Kesseldruckimprägnierung stattgefunden haben, sollte die praktische Verwertbarkeit des erfindungsgemäßen Verfahrens erläutert werden, ohne jedoch den Einsatzbereich einzuschränken. Es ist durchaus denkbar, die Wärmebehandlung in eine speziell konstruierte Fixierungskammer zu verlegen, die einerseits eine wesentliche bessere Prozeßsteuerung garantieren würde, andererseits auch die Nachbehandlung von frisch imprägnierten Hölzern aus anderen großtechnischen Anlagen, wie Trogtränkbecken, Einstelltränkbecken, Sprühtunnels u. dgl. ermöglichen würde.The practical usability of the method according to the invention should be explained on the basis of the two practical tests which have each taken place after a boiler pressure impregnation, but without restricting the area of use. It is quite conceivable to move the heat treatment into a specially designed fixation chamber, which on the one hand would guarantee a significantly better process control, on the other hand also the aftertreatment of freshly impregnated wood from other large-scale plants, such as trough-type drinking basins, adjustable drinking basins, spray tunnels and the like. Like. Would enable.
Claims (3)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3510364 | 1985-03-22 | ||
| DE19853510364 DE3510364A1 (en) | 1985-03-22 | 1985-03-22 | METHOD FOR THE ACCELERATED FIXING OF CHROMATE-CONTAINING WOOD PROTECTING SALTS |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0199092A1 true EP0199092A1 (en) | 1986-10-29 |
Family
ID=6265996
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP86103757A Withdrawn EP0199092A1 (en) | 1985-03-22 | 1986-03-19 | Process for the accelerated fixation of chromate-containing wood preservative salts |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US4716054A (en) |
| EP (1) | EP0199092A1 (en) |
| DE (1) | DE3510364A1 (en) |
| DK (1) | DK130786A (en) |
| FI (1) | FI860957A (en) |
| NO (1) | NO861118L (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1990006840A1 (en) * | 1988-12-16 | 1990-06-28 | Steen Ole Moldrup | Method and apparatus for the heating of wood or other materials sensitive to dehydration and heat |
| EP0386599A1 (en) * | 1989-03-07 | 1990-09-12 | Bell Pole Co. Ltd. | Process for fixing wooden articles pressure treated with chromated-copper-arsenate |
| WO2007039590A1 (en) * | 2005-10-04 | 2007-04-12 | Basf Se | Production of modified lignocellulosic materials |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4927672A (en) * | 1989-05-11 | 1990-05-22 | Drinkard Developments | Process for rapidly fixing wood preservatives to prevent and reduce environmental contamination |
| US5030483A (en) * | 1989-05-11 | 1991-07-09 | Drinkard Developments, A Delaware Partnership | Process for accelerated fixing of heat-fixable wood preservatives |
| DE102005047363A1 (en) * | 2005-10-04 | 2007-04-12 | Basf Ag | Low-formaldehyde lignocellulosic material and process for its preparation |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE111323C (en) * | ||||
| US1016024A (en) * | 1910-12-10 | 1912-01-30 | Hubertusmuehle Mit Beschraenkter Haftung | Process of preserving wood. |
| US2154433A (en) * | 1938-04-29 | 1939-04-18 | Du Pont | Process for preserving wood |
| DE2902658A1 (en) * | 1978-01-27 | 1979-08-02 | Bror Olof Haeger | PROCEDURE FOR THE PROTECTION OF WOOD |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2235822A (en) * | 1937-12-28 | 1941-03-25 | Celcure Corp | Process for impregnating wood |
| US3080212A (en) * | 1961-12-12 | 1963-03-05 | Koppers Co Inc | Treatment of wood with hot chromated copper arsenate solutions |
| US4303705A (en) * | 1977-09-27 | 1981-12-01 | Kelso Jr William C | Treatment of wood with water-borne preservatives |
| US4466998A (en) * | 1982-06-16 | 1984-08-21 | Koppers Company, Inc. | Wood impregnation |
-
1985
- 1985-03-22 DE DE19853510364 patent/DE3510364A1/en not_active Withdrawn
-
1986
- 1986-03-07 FI FI860957A patent/FI860957A/en not_active Application Discontinuation
- 1986-03-12 US US06/838,782 patent/US4716054A/en not_active Expired - Fee Related
- 1986-03-19 EP EP86103757A patent/EP0199092A1/en not_active Withdrawn
- 1986-03-21 NO NO861118A patent/NO861118L/en unknown
- 1986-03-21 DK DK130786A patent/DK130786A/en not_active Application Discontinuation
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE111323C (en) * | ||||
| US1016024A (en) * | 1910-12-10 | 1912-01-30 | Hubertusmuehle Mit Beschraenkter Haftung | Process of preserving wood. |
| US2154433A (en) * | 1938-04-29 | 1939-04-18 | Du Pont | Process for preserving wood |
| DE2902658A1 (en) * | 1978-01-27 | 1979-08-02 | Bror Olof Haeger | PROCEDURE FOR THE PROTECTION OF WOOD |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1990006840A1 (en) * | 1988-12-16 | 1990-06-28 | Steen Ole Moldrup | Method and apparatus for the heating of wood or other materials sensitive to dehydration and heat |
| EP0386599A1 (en) * | 1989-03-07 | 1990-09-12 | Bell Pole Co. Ltd. | Process for fixing wooden articles pressure treated with chromated-copper-arsenate |
| WO2007039590A1 (en) * | 2005-10-04 | 2007-04-12 | Basf Se | Production of modified lignocellulosic materials |
| AU2006298714B2 (en) * | 2005-10-04 | 2011-08-11 | Basf Se | Production of modified lignocellulosic materials |
Also Published As
| Publication number | Publication date |
|---|---|
| FI860957A0 (en) | 1986-03-07 |
| US4716054A (en) | 1987-12-29 |
| NO861118L (en) | 1986-09-23 |
| DK130786A (en) | 1986-09-23 |
| FI860957A (en) | 1986-09-23 |
| DK130786D0 (en) | 1986-03-21 |
| DE3510364A1 (en) | 1986-09-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE69807516T2 (en) | METHOD FOR DRYING SAWN WOOD AND DEVICE FOR IMPLEMENTING THE METHOD | |
| CH677582A5 (en) | ||
| DE2223911A1 (en) | Process for sterilizing packaging material and device for carrying out the process | |
| EP0199092A1 (en) | Process for the accelerated fixation of chromate-containing wood preservative salts | |
| DE3513021A1 (en) | METHOD AND DEVICE FOR HEAT TREATING FLOWABLE MATERIALS | |
| US4927672A (en) | Process for rapidly fixing wood preservatives to prevent and reduce environmental contamination | |
| DE4013219A1 (en) | Deodorising cork by removal of tri:chloro:anisole - using increased mobility of steam molecules to penetrate cork structure, allowing steam distillation to take place | |
| DE2823574A1 (en) | PROCESS FOR WOOD TREATMENT | |
| DE3043453A1 (en) | HIGH PRESSURE DAMPER FOR THE CONTINUOUS TREATMENT OF KNITWEAR | |
| DE4141976C2 (en) | Method and device for sanitizing pourable materials | |
| CH684507A5 (en) | A method for processing radioactive waste. | |
| DE1951486C3 (en) | Method and device for disinfection and / or sterilization with a germicidal agent, in particular formalin, in connection with saturated steam | |
| DE3525433A1 (en) | Process for speeding up the fixation of aqueous wood preservatives | |
| DE3410199A1 (en) | METHOD FOR PRESERVATING WOOD | |
| DE102021000553A1 (en) | Method and device for sanitizing returnable containers, in particular box-like plastic returnable containers | |
| US5030483A (en) | Process for accelerated fixing of heat-fixable wood preservatives | |
| DE3441767A1 (en) | Device for cooking food in steam without pressure | |
| US3197272A (en) | Method of treating cooling towers | |
| DE1492369A1 (en) | Method and device for deodorising transport and storage containers | |
| DE521110C (en) | Process for impregnation of wood with salt solutions, especially those of mercury sublimate | |
| DE2322698B2 (en) | Method for sterilizing or a corresponding treatment of an object which requires correlated time-temperature management | |
| DE2158078A1 (en) | Process for the chemical treatment of wood or wood-based materials | |
| DE2222992C3 (en) | Method and device for sterilization by means of a sterilizing medium which acts at least partially chemically on the item to be sterilized | |
| DE3043659A1 (en) | Timber treatment e.g. waterproofing, protection against fungi - by drying surface and treating with warm oil in vacuo | |
| AT104748B (en) | Process for treating timber to prevent it from shrinking later. |
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 |
|
| 17P | Request for examination filed |
Effective date: 19860830 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE FR GB IT LI NL SE |
|
| 17Q | First examination report despatched |
Effective date: 19870728 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN |
|
| 18W | Application withdrawn |
Withdrawal date: 19871124 |
|
| RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: STANEK, RICHARD, DR. Inventor name: HETTLER, WENDELIN Inventor name: WAGNER, CLAUS, DR. Inventor name: MARX, HANS-NORBERT |