EP0946340B1 - Method for stocking and preserving green round wood and sawn timber - Google Patents

Method for stocking and preserving green round wood and sawn timber Download PDF

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Publication number
EP0946340B1
EP0946340B1 EP97952739A EP97952739A EP0946340B1 EP 0946340 B1 EP0946340 B1 EP 0946340B1 EP 97952739 A EP97952739 A EP 97952739A EP 97952739 A EP97952739 A EP 97952739A EP 0946340 B1 EP0946340 B1 EP 0946340B1
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EP
European Patent Office
Prior art keywords
wood
sheeting
enclosure
vol
storage
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German (de)
French (fr)
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EP0946340A1 (en
Inventor
Gerold Mahler
Christoph Richter
Martin Gross
Andreas Weber
Thomas Maier
Jürgen König
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Technische Universitaet Dresden
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Forstliche Versuchs- und Forschungsanstalt Baden-Wuerttemberg
Technische Universitaet Dresden
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    • 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
    • B27K5/0095—Treating of wood not provided for in groups B27K1/00, B27K3/00 by employing wrappers

Definitions

  • the invention relates to a method for preserving Storage of fresh logs and fresh sawn timber, such as Softwood and hardwood, for storage over long periods without loss of quality.
  • Pesticide use is associated with the endangerment of nature and humans.
  • a safe preservation option is the rapid processing and drying of the wood. This forces large cutting and drying reserves to be able to quickly process a large mass of logs (calamities, windthrow). Attempts to preserve fresh logs in dry pile are also known. However, the procedure is associated with a high risk of fungal and insect attack.
  • DE-A-28 57 355 a method for the microbiological modification of hardwood by the action of microorganisms is known.
  • the microorganisms bring about a selective change in the hardwood, the temperature, the moisture content of the wood, the O 2 content and the CO 2 content being regulated with regard to the microorganisms.
  • DE-A-34 34 551 a specific color change is caused on logs by treatment with wood-destroying fungi. The color change occurs at the point where the mushroom culture was applied. The application of several wood cultures is also described, which is associated with an advantageous boundary layer formation.
  • the invention is based on the object of a method develop with fresh logs with reasonable effort or fresh sawn timber of all tree types for a longer one Period without compromising quality and Strength properties can be stored without first sterilized, moistened, dried or with special Shielding gases must be treated.
  • the airtight envelope does not guarantee this Oxygen can enter from the outside and no other generated carbon dioxide can escape from the envelope.
  • This low oxygen content is achieved in that a further cycle begins after the breathing processes customary in fruit storage, in which CO 2 and H 2 O are released and which have ended with the consumption of O 2 . Fermentation processes take place in which additional CO 2 is released so that the proportion of CO 2 can increase further.
  • the start of fermentation processes is in the invention (in Contrary to the storage of fruit) of essential advantage. On Cellulose and lignin breakdown is not associated, as it is only slight soluble sugars are broken down. Thus, the strength of the Get round or sawn timber.
  • the biotechnological process started after the air is closed can be accelerated by minimizing the air volume involved in the casing.
  • a housing advantageously a film with high diffusion resistance, is used to produce the air seal.
  • the film can be doubled to reduce the risk of leakage.
  • the advantage of a flexible cover is that the air volume can be reduced to a minimum (suction until the film tightly encloses the pile or lumber stack surface).
  • the air seal can also be achieved in specially prepared warehouses, containers, ship holds, lined pits, silos or mine tunnels. After a short opening of the airtight casing for the removal of wood, the almost oxygen-free atmosphere is restored after a few days. Regardless of the time of year, the microorganisms are able to bring them back into their favorable condition. In addition, CO 2 , which is stored in the wood as a porous body and dissolved in the water bound in the wood, can be released again to produce a new gas equilibrium.
  • the main advantage of the method according to the invention is in that the preservative storage without an additional Fumigation comes out.
  • Duplicate dual films 2 were spread out on a flat surface and covered with 30 cbm of non-bared profiled wood, spruce 1, diameter groups 15-25 cm.
  • Two measuring hoses 5 were laid without pressure in the pile and fastened to the film 2 with bulkhead screw connections 4 . According to FIG. 1, the protruding film 2 was then pulled over the pile and the two films 2 - separately from one another - were welded with a double seam.
  • the oxygen content drops below 0.1%.
  • the carbon dioxide content levels out at around 40% (cf. FIG. 4). After 24 months of storage, there is no evidence of blueness, red streaking or Halli-mash infestation.
  • the flexural strengths measured according to DIN 52186 after storage are not lower than those of fresh comparative samples (cf. FIG. 5).
  • a maple veneer trunk with a center diameter of 35 cm and a length of 3 m is rolled into double dual film 2 .
  • a bulkhead screw connection is attached near the end faces of trunk 1 .
  • the foils 2 are then double-welded 3 . After 2 weeks there is an atmosphere that contains less than 0.1% oxygen and whose carbon dioxide content is up to 30%.
  • the wood is sealed in airtight Holds, filling the hold volume if possible, layered. Since the holds are already watertight thanks to bulkheads can only be closed, the air seal must be on top through airtight or sealed hatches. Around Shortening the setting time is called initial fumigation Combustion gases from the ship's diesel are fed into the hold.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Storage Of Harvested Produce (AREA)
  • Storage Of Fruits Or Vegetables (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
  • Mushroom Cultivation (AREA)

Abstract

The invention relates to a method for stocking and preserving green round wood and sawn timber, which is stored in an airtight and lighttight sealing cover. The oxygen inside the cover is decomposed by the respiratory process of fungi, bacteria and wood cells that are still alive, thereby forming CO2 and H2O. Fermentation processes also lead to the decomposition of hemicelluloses and saccharides which are converted to organic acids and CO2. The oxygen content in the cover is less than 0.1 vol. % after an adjustment time of 3 to 10 days of total stocking, while said CO2 content rises to more than 21 and up to 40 vol. %. This method enables green round wood a swan timber to be stocked over long periods without wastage or environmental damage.

Description

Die Erfindung betrifft ein Verfahren zur konservierenden Lagerung von frischem Rundholz und frischem Schnittholz, wie Nadel- und Laubholz, zur Aufbewahrung über längere Zeiträume ohne Qualitätsverlust.The invention relates to a method for preserving Storage of fresh logs and fresh sawn timber, such as Softwood and hardwood, for storage over long periods without loss of quality.

Bisher übliche allgemeine Konservierungsverfahren betreffen vorzugsweise Lebensmittel, die entweder unter Luftabschluß und Erhitzung sterilisiert werden (einkochen) oder im trockenen Zustand mit Kohlendioxid begast werden (Getreideschutz gegen Kornkäferbefall) oder mit Schutzgasen spezieller Zusammensetzung behandelt werden (Früchtelagerung und -reifung unter Stickstoff-Kohlendioxid-Atmosphäre) oder unter reinem Stickstoff von Insekten befreit werden (Restaurierung von Holzgegenständen, deren Farbpigmente von Kohlendioxid angegriffen würden).Common general preservation procedures used so far preferably foods that are either airless and Heating can be sterilized (boil down) or dry Be gassed with carbon dioxide (grain protection against Grain beetle infestation) or with protective gases of a special composition treated (fruit storage and ripening under nitrogen-carbon dioxide atmosphere) or under pure nitrogen from Free insects (restoration of wooden objects, whose color pigments would be attacked by carbon dioxide).

Bisher speziell bei der Konservierung von frischem Rundholz angewendete Verfahren beruhen auf Wasserlagerung oder Berieselung mit Wasser. Ziel ist es, eine hohe Holzfeuchte von über 100 % zu erhalten, damit Pilzwachstum verhindert wird. Nachteilig sind der hohe Wasserverbrauch und die Grundwasserkontamination mit Holzinhaltstoffen, verbunden mit unterschiedlicher Feuchte im Polterinneren, mit der möglichen Folge von Pilzbefall (Hallimasch). So far, especially in the preservation of fresh logs procedures used are based on water storage or Sprinkling with water. The aim is to have a high wood moisture content maintain over 100% to prevent fungal growth. Disadvantages are the high water consumption and the Groundwater contamination with wood constituents, associated with different humidity inside the pile, with the possible Result of fungal attack (Hallimasch).

Ferner kann mit Hilfe von Insektiziden und Fungiziden Rund- und Schnittholz zeitweise konserviert werden. Pestizideinsatz ist mit der Gefährdung von Natur und Mensch verbunden.Furthermore, with the help of insecticides and fungicides round and Lumber can be preserved temporarily. Pesticide use is associated with the endangerment of nature and humans.

Eine sichere Konservierungsmöglichkeit besteht in der raschen Aufarbeitung und Trocknung des Holzes. Dies zwingt zur Bildung von großen Einschnitt- und Trocknerreserven, um einen großen Massenanfall von Rundholz (Kalamitäten, Windwurf) schnell verarbeiten zu können.
Versuche, frisches Rundholz in Trockenpoltern zu konservieren, sind ebenfalls bekannt. Das Verfahren ist aber mit einem hohen Risiko des Pilz- und Insektenbefalles verbunden.A safe preservation option is the rapid processing and drying of the wood. This forces large cutting and drying reserves to be able to quickly process a large mass of logs (calamities, windthrow).
Attempts to preserve fresh logs in dry pile are also known. However, the procedure is associated with a high risk of fungal and insect attack.

Verfahren, die mit Hilfe von Pilzkulturen auf die Holzeigenschaften einwirken, sind aus der DE-A- 28 57 355 und der DE-A- 34 34 551 bekannt.Processes with the help of fungal cultures on the Wood properties act, are from DE-A-28 57 355 and known from DE-A-34 34 551.

Nach der DE-A- 28 57 355 ist ein Verfahren zur mikrobiologischen Veränderung von Laubholz durch Einwirkung von Mikroorganismen bekannt. Durch die Mikroorganismen wird eine selektive Veränderung des Laubholzes bewirkt, wobei die Temperatur, der Feuchtigkeitsgehalt des Holzes, der O2-Gehalt und der CO2-Gehalt mit Rücksicht auf die Mikroorganismen geregelt werden.
Bei DE-A- 34 34 551 wird an Rundholz eine gezielte Farbveränderung durch Behandlung mittels holzzerstörender Pilze hervorgerufen. Die Farbveränderung erfolgt an der Stelle, an der die Pilzkultur aufgetragen wurde. Es wird auch das Auftragen mehrerer Holzkulturen beschrieben, was mit einer vorteilhaften Grenzschichtbildung verbunden ist. According to DE-A-28 57 355, a method for the microbiological modification of hardwood by the action of microorganisms is known. The microorganisms bring about a selective change in the hardwood, the temperature, the moisture content of the wood, the O 2 content and the CO 2 content being regulated with regard to the microorganisms.
In DE-A-34 34 551, a specific color change is caused on logs by treatment with wood-destroying fungi. The color change occurs at the point where the mushroom culture was applied. The application of several wood cultures is also described, which is associated with an advantageous boundary layer formation.

Bei US-A-2 617 202 wird frisches Schnittholz der Holzart Black Oak 3 - 5 Tage lang gestapelt und der gesamte Stapel oder nur die Spitze des Schnittholzstapels mit einer Folie abgedeckt, was durch eine Erwärmung des Holzes Gärungsvorgänge bewirken kann. Anschließend wird in einer zweiten Verfahrensstufe jedes Brett auf den Erdboden gelegt und in regelmäßigen Abständen gedreht, was eine schonende Trocknung ermöglichen und damit unerwünschte Rißbildungen vermeiden soll.At US-A-2 617 202 fresh lumber of the wood type Black Oak stacked for 3-5 days and the whole stack or just the top of the lumber stack covered with a film of what can cause fermentation processes by heating the wood. Then, in a second stage of the process, each board laid on the ground and rotated at regular intervals, which allow gentle drying and thus undesirable Should avoid cracking.

In der Druckschrift Mahler, G.: Konservierung von Holz durch Schutzgas. AFZ 47 (1992), 19, S. 1024 - 1025 wird über Versuche berichtet, Holz durch Schutzgas zu konservieren. Bei den Versuchen wurden Hölzer in standardisierten Dimensionen in Silofolie eingepackt. Die Polter wurden mit Stickstoff als auch mit Kohlendioxid begast; an Gasvolumen wurde jeweils etwa die dreifache Menge des Holzvolumens benötigt. Damit wurde der Sauerstoffgehalt auf 4 bis 5 % reduziert und über einen längeren Zeitraum (mehr als 6 Monate) aufrechterhalten. Nach dem Öffnen der Polter wurde ein pilzlicher Überzug an den Hölzern festgestellt, dem eine antagonistische Wirkung zugeschrieben und darauf hingewiesen wird, daß durch Förderung antagonistisch wirkender Pilze ein Befall von holzzerstörenden Pilzen verhindert werden könnte.
Nachteilig erscheint der beschriebene Begasungsaufwand und der relativ hohe Sauerstoffrestgehalt.In the publication Mahler, G .: Preservation of wood by protective gas. AFZ 47 (1992), 19, pp. 1024-1025 reports on attempts to preserve wood with protective gas. During the tests, wood in standardized dimensions was packed in silage film. The pile was gassed with nitrogen as well as with carbon dioxide; the gas volume required about three times the volume of the wood. This reduced the oxygen content to 4 to 5% and maintained it over a longer period (more than 6 months). After opening the pile, a fungal coating was found on the wood, which is said to have an antagonistic effect and is pointed out that by promoting antagonistic fungi, an attack by wood-destroying fungi could be prevented.
The described fumigation expenditure and the relatively high residual oxygen content appear to be disadvantageous.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zu entwickeln, mit dem bei vertretbarem Aufwand frisches Rundholz oder frisches Schnittholz aller Baumarten für einen längeren Zeitraum ohne Beeinträchtigung der Qualität und Festigkeitseigenschaften gelagert werden kann, ohne daß vorher sterilisiert, befeuchtet, getrocknet oder mit speziellen Schutzgasen behandelt werden muß.The invention is based on the object of a method develop with fresh logs with reasonable effort or fresh sawn timber of all tree types for a longer one Period without compromising quality and Strength properties can be stored without first sterilized, moistened, dried or with special Shielding gases must be treated.

Die Aufgabe wird mit den im Anspruch 1 genannten Verfahrensmerkmalen gelöst. Vorteilhafte Varianten ergeben sich aus den Unteransprüchen.The task is with those mentioned in claim 1 Process features resolved. There are advantageous variants from the subclaims.

Zunächst ist festzustellen, daß eine gewisse Überraschung darin besteht, daß das feuchte, unentrindete Holz unter einer austauscharmen Atmosphäre nicht stockt und fault. Wesentlich an der Erfindung ist aber, daß durch Atmungsprozesse noch lebender Holzzellen und ggfs. Durch Stoffwechselprozesse von Pilzen, Bakterien, die mit dem frischen Rund- oder Schnittholz in die Umhüllung eingelagert werden, eine nahezu sauerstofffreie und kohlendioxidangereicherte Atmosphäre erzeugt wird.First of all, there is some surprise in it there is that the damp, bark-free wood under one low-exchange atmosphere does not falter and rot. Essential the invention, however, is that by breathing processes even more alive Wooden cells and possibly through metabolic processes of fungi, Bacteria in the fresh round or sawn timber Envelope to be stored, an almost oxygen-free and carbon dioxide-enriched atmosphere is generated.

Die luftdichte Umhüllung gewährleistet einerseits das kein Sauerstoff von außen zutreten kann und andererseits kein erzeugtes Kohlendioxid aus der Umhüllung austreten kann.On the one hand, the airtight envelope does not guarantee this Oxygen can enter from the outside and no other generated carbon dioxide can escape from the envelope.

Entgegen der in Mahler, G.: Konservierung von Holz durch Schutzgas. AFZ 47 (1992), 19, S. 1024 - 1025 dargelegten Auffassung ist nicht die Wirkung der pilzlichen Antagonisten von ausschlaggebender Bedeutung, holzzerstörende Pilze am Wachstum zu hindern. Vielmehr ist der sehr geringe Sauerstoffgehalt von unter 0,1 Vol.-% von wesentlicher Bedeutung einer dauerhaften Lagerung. Contrary to that in Mahler, G .: Conservation of wood by Shielding gas. AFZ 47 (1992), 19, pp. 1024-1025 Is not the effect of the fungal antagonists of crucial, wood-destroying fungi on growth to prevent. Rather, the very low oxygen content of below 0.1 vol .-% essential for a permanent Storage.

Dieser geringe Sauerstoffgehalt wird dadurch erreicht, daß nach den bei der Obstlagerung üblichen Atmungsprozessen, bei denen CO2 und H2O freigesetzt wird und die mit der Aufzehrung des O2 beendet sind, ein weiterer Zyklus beginnt. Dabei finden Gärungsprozesse statt, bei denen zusätzlich CO2 freigesetzt wird, so daß sich der Anteil an CO2 weiter erhöhen kann.This low oxygen content is achieved in that a further cycle begins after the breathing processes customary in fruit storage, in which CO 2 and H 2 O are released and which have ended with the consumption of O 2 . Fermentation processes take place in which additional CO 2 is released so that the proportion of CO 2 can increase further.

Die Ingangsetzung von Gärungsprozessen ist bei der Erfindung (im Gegensatz zur Früchtelagerung) von wesentlichem Vorteil. Ein Cellulose- und Ligninabbau geht nicht einher, da nur leicht lösliche Zucker abgebaut werden. Somit bleibt die Festigkeit des Rund- bzw. Schnittholzes erhalten.The start of fermentation processes is in the invention (in Contrary to the storage of fruit) of essential advantage. On Cellulose and lignin breakdown is not associated, as it is only slight soluble sugars are broken down. Thus, the strength of the Get round or sawn timber.

Der nach Luftabschluß in Gang gesetzte biotechnologische Prozeß kann durch Minimierung des beteiligten Luftvolumens in der Umhüllung beschleunigt werden.
Zur Herstellung des Luftabschlusses wird eine Einhausung, vorteilhaft eine Folie mit hohem Diffusionswiderstand, verwendet. Zur Verminderung des Risikos einer Leckage kann die Folie gedoppelt werden. Der Vorteil einer flexiblen Hülle besteht darin, daß das Luftvolumen auf ein Minimum gesenkt werden kann (Absaugung, bis die Folie die Polter- bzw. Schnittholzstapeloberfläche eng umschließt).The biotechnological process started after the air is closed can be accelerated by minimizing the air volume involved in the casing.
A housing, advantageously a film with high diffusion resistance, is used to produce the air seal. The film can be doubled to reduce the risk of leakage. The advantage of a flexible cover is that the air volume can be reduced to a minimum (suction until the film tightly encloses the pile or lumber stack surface).

Der Luftabschluß kann aber auch in eigens hergerichteten Lagerhallen, Containern, Schiffsladeräumen, ausgekleideten Gruben, Silos oder Bergwerkstollen erreicht werden.
Nach kurzzeitiger Öffnung der luftdichten Umhüllung zur Entnahme von Holz stellt sich nach Wiederverschluß in wenigen Tagen die nahezu sauerstofffreie Atmosphäre wieder ein. Die Mikroorganismen sind - unabhängig von der Jahreszeit - in der Lage, den für sie günstigen Zustand wieder herbeizuführen. Außerdem kann CO2, das im Holz als porösem Körper gespeichert und dem im Holz gebundenen Wasser gelöst ist, zur Herstellung eines neuen Gasgleichgewichtes wieder abgegeben werden.The air seal can also be achieved in specially prepared warehouses, containers, ship holds, lined pits, silos or mine tunnels.
After a short opening of the airtight casing for the removal of wood, the almost oxygen-free atmosphere is restored after a few days. Regardless of the time of year, the microorganisms are able to bring them back into their favorable condition. In addition, CO 2 , which is stored in the wood as a porous body and dissolved in the water bound in the wood, can be released again to produce a new gas equilibrium.

Bei Folielagerung wird der Luftabschluß der Schicht- oder Langholzpolter, bei wertvollen (Furnier)stämmen auch der Einzelschutz, rationell mit einer doppelten Schweißnaht an der umhüllenden Folie bzw. durch Verkleben erreicht oder durch Festklemmen der glatt aufeinander liegenden Folienbahnen mit Leisten, um die anschließend die Folie straff gewickelt und mit Klemmen gegen Wiederaufrollen gesichert wird.In the case of foil storage, the air is sealed off from the layer or Long wood piles, in the case of valuable (veneer) logs too Individual protection, efficient with a double weld on the enveloping film or achieved by gluing or by Clamp the film sheets lying on top of each other with Last, around which the film is then wrapped tightly and with Is secured against rewinding.

Der wesentliche Vorteil des erfindungsgemäßen Verfahrens besteht darin, daß die konservierende Lagerung ohne eine zusätzliche Begasung auskommt.The main advantage of the method according to the invention is in that the preservative storage without an additional Fumigation comes out.

Die Erfindung wird nachfolgend an Hand von mehreren Ausführungsbeispielen näher erläutert. In den Zeichnungen zeigen:

Fig. 1
eine Anordnung mit mehreren Rundhölzern verschweißter bzw. verklebter doppelter Folienumhüllung
Fig. 2
eine Anordnung mit einem Rundholz mit verschweißter bzw. verklebter doppelter Folienumhüllung
Fig. 3
eine Klemmverbindung an den Folienrändern
Fig. 4
ein Diagramm mit Darstellung der Gasentwicklung bei Lagerung unter Luftabschluß
Fig. 5
ein Diagramm mit Darstellung der Biegefestigkeit im Lagerverlauf nach Lagerung unter Sauerstoffentzug mit Nullprobe und DIN-Wert
The invention is explained in more detail below using several exemplary embodiments. The drawings show:
Fig. 1
an arrangement with several round timbers welded or glued double foil wrapping
Fig. 2
an arrangement with a round timber with welded or glued double foil wrapping
Fig. 3
a clamp connection on the film edges
Fig. 4
a diagram showing the gas development when stored under the exclusion of air
Fig. 5
a diagram showing the bending strength in the course of the bearing after storage with oxygen removal with zero sample and DIN value

Beispiel 1example 1

Gedoppelte Dualenfolien 2 wurden auf eine plane Fläche ausgebreitet und mit 30 cbm unentrindetem Profilzerspanerholz Fichte 1 Durchmessergruppen 15-25 cm, belegt. Zwei Meßschläuche 5 wurden druckfrei im Polter verlegt und mit Schottverschraubungen 4 an der Folie 2 befestigt. Gemäß der Fig. 1 wurde anschließend die überstehende Folie 2 über das Polter gezogen und beide Folien 2 - getrennt voneinander - mit doppelter Naht verschweißt. Im Sommer sinkt nach ca. 3 Tagen, im Winter nach ca. 10 Tagen der Sauerstoffanteil unter 0,1 %. Der Kohlendioxidgehalt pegelt sich bei ca. 40 % ein (vgl. Fig. 4). Nach 24 Monaten Lagerdauer sind weder Bläue, Rotstreifigkeit noch Hallimaschbefall nachweisbar. Die nach DIN 52186 gemessenen Biegefestigkeiten liegen nach Lagerung nicht unter denen frischer Vergleichsproben (vgl. Fig. 5).Duplicate dual films 2 were spread out on a flat surface and covered with 30 cbm of non-bared profiled wood, spruce 1, diameter groups 15-25 cm. Two measuring hoses 5 were laid without pressure in the pile and fastened to the film 2 with bulkhead screw connections 4 . According to FIG. 1, the protruding film 2 was then pulled over the pile and the two films 2 - separately from one another - were welded with a double seam. In summer, after approx. 3 days, in winter after approx. 10 days, the oxygen content drops below 0.1%. The carbon dioxide content levels out at around 40% (cf. FIG. 4). After 24 months of storage, there is no evidence of blueness, red streaking or Halli-mash infestation. The flexural strengths measured according to DIN 52186 after storage are not lower than those of fresh comparative samples (cf. FIG. 5).

Beispiel 2Example 2

1 m3 Schichtholz Kiefer 1 wurde wie in Fig. 3 in doppelte Dualenfolie gehüllt. Beide Folienenden wurden glatt zwischen zwei Leisten 6 geklemmt und in diese Leisten 6 straff gewickelt. Mittels Klammern 7 wurde der so entstandene Verbund gegen Aufdrehen gesichert. Damit kann ohne Schweißnaht mit vor Ort vorhandenen Mitteln die Voraussetzung zur Einstellung der Gasatmosphäre geschaffen werden.1 m 3 of plywood pine 1 was wrapped in double dual film as in FIG. 3. Both ends of the film were clamped smoothly between two strips 6 and wound tightly in these strips 6 . The resulting bond was secured against unscrewing by means of clips 7 . This means that the prerequisites for setting the gas atmosphere can be created without a weld using means available on site.

Beispiel 3Example 3

Nach Fig. 2 ist ein Ahorn-Furnierstamm von 35 cm Mittendurchmesser und 3 m Länge in doppelte Dualenfolie 2 eingerollt. In der Nähe der Stirnflächen des Stammes 1 wird je eine Schottverschraubung angebracht. Anschließend werden die Folien 2 doppelt 3 verschweißt. Nach 2 Wochen stellt sich eine Atmosphäre ein, die weniger als 0,1 % Sauerstoff enthält und deren Kohlendioxidanteil bis zu 30 % beträgt.According to FIG. 2, a maple veneer trunk with a center diameter of 35 cm and a length of 3 m is rolled into double dual film 2 . A bulkhead screw connection is attached near the end faces of trunk 1 . The foils 2 are then double-welded 3 . After 2 weeks there is an atmosphere that contains less than 0.1% oxygen and whose carbon dioxide content is up to 30%.

Beispiel 4Example 4

Um Überseetransporte von frischem Rundholz schadlos zu ermöglichen, wird das Holz in luftdicht abgeschlossenen Laderäumen, möglichst das Laderaumvolumen ausfüllend, geschichtet. Da die Laderäume durch Schotte bereits wasserdicht verschlossen werden können, muß nur oberseits der Luftabschluß durch luftdichte oder abgedichtete Luken hergestellt werden. Um die Einstelldauer zu verkürzen, werden als Initialbegasung Verbrennungsgase der Schiffsdiesel dem Laderaum zugeführt.To harmless overseas transport of fresh logs allow, the wood is sealed in airtight Holds, filling the hold volume if possible, layered. Since the holds are already watertight thanks to bulkheads can only be closed, the air seal must be on top through airtight or sealed hatches. Around Shortening the setting time is called initial fumigation Combustion gases from the ship's diesel are fed into the hold.

Claims (14)

  1. Method of preservative storage of fresh logs and sawn timber, wherein the wood is stored under a cover consisting of a sheet of plastic material, which may result in respiratory and fermentation processes by fungi, bacteria as well as respiratory processes of wood cells that are still alive, wherein:
    the fresh logs and sawn timber (1) are stored under an air-tight and light-tight covering (2),
    the oxygen in the enclosure, by metabolic reactions converts into CO2, H2O and organic acids, whereby essentially hemicelluloses and sugars are metabolized,
    and thus, after an adjustment period of 3-10 days, the oxygen content in the space enclosed by the covering is less than 0.1 Vol.% over the entire storage period, and the CO2 content increases to more than 21 to 40 Vol.%, greatly preventing the growth of wood-destroying fungi.
  2. Method according to Claim 1, wherein, in order to reduce the adjustment time, the CO2 content is set to a level in excess of 21 Vol.% by an additional fumigation with CO2 immediately after beginning of the storage.
  3. Method according to Claim 1 or 2, wherein, prior the respiratory and fermentation processes, the volume of the enclosed air is minimized.
  4. Method according to Claims 1 to 3, wherein a rigid or flexible enclosure is used as a cover, with the enclosed space being air- and light-tight.
  5. Method according to Claims 1 to 4, wherein a single or double, UV-resistant sheet of plastic material (2) with a high diffusion resistance is used as covering material.
  6. Method according to Claim 5, wherein a double-layer sheeting (2) is used as a film whose black internal surface prevents the light from penetrating and thereby algae from growing, and whose white external surface reflects the sunlight.
  7. Method according to Claim 5 or 6, wherein the two layers of the sheeting (2) are welded either consecutively or simultaneously by double welds (3).
  8. Method according to Claim 5 or 6, wherein the two layers of the sheeting (2) are bonded with each other.
  9. Method according to Claim 5 or 6, wherein the two-layers of the sheeting (2) lie one upon the other, clamped between two strips (6), tightly wrapped around said strips, and secured by means of a clamping device (7).
  10. Method according to Claims 5 to 9, wherein bulkhead fittings (4) for gas measuring flexible tubes (6), which penetrate said sheeting (2), are attached to the sheeting.
  11. Method according to Claim 4 or 10, wherein the bulkhead fittings are provided with extension hoses inside the enclosure, and the hose ends pointing to opposite directions in the enclosure.
  12. Method according to Claim 11, wherein measuring instruments are connected to the gas measuring flexible tubes through quick-connect couplings, thus enabling to supervise the course of the storage, on the basis of the gas composition.
  13. Method according to Claim 4, wherein containers or loading bays are used as rigid enclosure.
  14. Method according to Claim 13, wherein the containers or loading bays are supplied with exhaust gases from the combustion processes of the transport vehicles, or stationary plants, respectively.
EP97952739A 1996-12-19 1997-12-19 Method for stocking and preserving green round wood and sawn timber Expired - Lifetime EP0946340B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19652951 1996-12-19
DE19652951A DE19652951A1 (en) 1996-12-19 1996-12-19 Process for the preservative storage of fresh logs
PCT/DE1997/002966 WO1998026907A1 (en) 1996-12-19 1997-12-19 Method for stocking and preserving green round wood and sawn timber

Publications (2)

Publication Number Publication Date
EP0946340A1 EP0946340A1 (en) 1999-10-06
EP0946340B1 true EP0946340B1 (en) 2001-11-14

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EP97952739A Expired - Lifetime EP0946340B1 (en) 1996-12-19 1997-12-19 Method for stocking and preserving green round wood and sawn timber

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US (1) US6830727B1 (en)
EP (1) EP0946340B1 (en)
JP (1) JP2001506193A (en)
CN (1) CN1081521C (en)
AT (1) ATE208691T1 (en)
CA (1) CA2274636C (en)
CZ (1) CZ291309B6 (en)
DE (2) DE19652951A1 (en)
DK (1) DK0946340T3 (en)
ES (1) ES2167807T3 (en)
NZ (1) NZ336637A (en)
RU (1) RU2177406C2 (en)
WO (1) WO1998026907A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19652951A1 (en) 1996-12-19 1998-06-25 Univ Dresden Tech Process for the preservative storage of fresh logs
FR2806953B1 (en) * 2000-03-31 2002-06-21 Step LIGHTWEIGHT SHELTER AND METHOD FOR THE STORAGE AND PRESERVATION IN A CONFINED ENVIRONMENT OF LOGS AND / OR SAW TIMBER
CN106965281B (en) * 2017-04-10 2018-10-23 阜南佳利工艺品有限公司 A kind of processing method improving willow plank anti-aging property
RU192914U1 (en) * 2019-06-04 2019-10-07 Федеральное государственное бюджетное образовательное учреждение высшего образования "Уральский государственный лесотехнический университет" STACK FOR STORAGE ROUND FOREST MATERIALS

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DE267188C (en) 1911-04-12
US2617202A (en) 1949-08-15 1952-11-11 Earl L Reedy Process of curing and treating lumber
US3431061A (en) * 1963-10-11 1969-03-04 Union Bag Camp Paper Corp Preserving method for outdoor storage of wood used in paper manufacture
SE407758B (en) 1977-10-04 1979-04-23 Enfors Sven Olof PROCEDURE FOR MICROBIOLOGICAL MODIFICATION OF LOVTERS BY THE IMPACT OF AEROBA MICRO-ORGANISMS
EP0058499A1 (en) 1981-02-12 1982-08-25 Blacknell Building Products Limited Timber impregnation
SE455477B (en) 1983-09-20 1988-07-18 Hansson Goeran PROCEDURE FOR WORKING TREE TO ASTADCOM ZONING IN THE TREE USING MUSHROOMS AND ZONATED TREMATERIAL
DD267188A1 (en) * 1987-12-24 1989-04-26 Univ Dresden Tech METHOD FOR PRESERVING WOOD
JPH0639811A (en) * 1992-07-27 1994-02-15 Nippon Sanso Kk Method for preservation of lumber
US5363568A (en) 1992-11-20 1994-11-15 Cornelia Textiles, Inc. Method of inhibiting lumber checking
US5447686A (en) * 1994-06-17 1995-09-05 Seidner; Marc A. Method for heat-treating wood and wood products
NZ280874A (en) 1996-01-23 1997-08-22 Nz Forest Research Inst Ltd Prevention of sapstain in wood by applying a water barrier over the wood surface
US5718851A (en) * 1996-04-22 1998-02-17 Wadas, Jr.; Ronald M. Pile cap assembly and method
US5725613A (en) * 1996-07-08 1998-03-10 Hazen Research, Inc Method to reduce oxidative deterioration of bulk materials
US6063336A (en) * 1996-08-02 2000-05-16 Westward Corporation Method and apparatus for wood chip pasteurization
DE19652951A1 (en) 1996-12-19 1998-06-25 Univ Dresden Tech Process for the preservative storage of fresh logs

Also Published As

Publication number Publication date
CA2274636A1 (en) 1998-06-25
DK0946340T3 (en) 2002-02-25
DE19652951A1 (en) 1998-06-25
EP0946340A1 (en) 1999-10-06
JP2001506193A (en) 2001-05-15
US6830727B1 (en) 2004-12-14
DE59705415D1 (en) 2001-12-20
WO1998026907A1 (en) 1998-06-25
ES2167807T3 (en) 2002-05-16
RU2177406C2 (en) 2001-12-27
CZ291309B6 (en) 2003-01-15
ATE208691T1 (en) 2001-11-15
CZ225099A3 (en) 2000-01-12
CN1244830A (en) 2000-02-16
CN1081521C (en) 2002-03-27
CA2274636C (en) 2007-01-30
NZ336637A (en) 2001-09-28

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