SI24340A - The process of continous vacuum/suction veneer impregnation - Google Patents

The process of continous vacuum/suction veneer impregnation Download PDF

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Publication number
SI24340A
SI24340A SI201300093A SI201300093A SI24340A SI 24340 A SI24340 A SI 24340A SI 201300093 A SI201300093 A SI 201300093A SI 201300093 A SI201300093 A SI 201300093A SI 24340 A SI24340 A SI 24340A
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Slovenia
Prior art keywords
preparation
veneer
impregnation
vacuum
wood
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SI201300093A
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Slovenian (sl)
Inventor
Zoran Guštin
Renata ÄŚesnik
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Intech-Les, Razvojni Center, D.O.O.
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Publication date
Application filed by Intech-Les, Razvojni Center, D.O.O. filed Critical Intech-Les, Razvojni Center, D.O.O.
Priority to SI201300093A priority Critical patent/SI24340A/en
Priority to PCT/SI2013/000070 priority patent/WO2014168588A1/en
Publication of SI24340A publication Critical patent/SI24340A/en

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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
    • 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
    • B27K3/08—Impregnating by pressure, e.g. vacuum impregnation
    • B27K3/10—Apparatus

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)

Abstract

Izum se nanaša na postopek pretočne vakuumske/sesalne impregnacije furnirja kot načina vnašanja različnih tekočih snovi v globino lesne mase vsakega lista furnirja posebej. Izum je značilen po tem, da furnir (1) potuje po transportni napravi (37) v aplikator (50) pripravka kjer se impregnacijski pripravek nanese na odprto stran (1a) furnirja (1), nakar vstopi v impregnacijsko enoto (400) tako, da je s tlačno stranjo (1b) obrnjen v vakuumsko sesalne šobe (410) kjer podtlak povzroči sesanje pripravka iz odprte površine (1a) in prodiranje v globino lesa furnirja (1).The invention relates to a process for flowing vacuum / suction impregnation of veneer as a method of introducing various liquid substances into the depth of the wood weight of each sheet of veneer separately. The invention is characterized in that the veneer (1) travels through the conveyor device (37) into the applicator (50) of the preparation where the impregnation preparation is applied to the open side (1a) of the veneer (1), and then enters the impregnation unit (400) characterized in that the pressure side (1b) is turned into vacuum suction nozzles (410) where the vacuum causes the preparation of the preparation from the open surface (1a) to penetrate and penetration into the veneer wood veneer (1).

Description

POSTOPEK PRETOČNE VAKUUMSKE/SESALNE IMPREGNACIJE FURNIRJAVACUUM VACUUM / VACUUM IMPREGNATION PROCEDURE FOR VENEER

Področje tehnike/Predmet izumaFIELD OF THE INVENTION

Izum se nanaša na postopek pretočne vakuumske/sesalne impregnacije furnirja kot načina vnašanja različnih tekočih snovi v globino lesne mase vsakega lista furnirja posebej. Tekoče snovi so lahko vodne raztopine anorganskih ali organskih snovi/kemikalij ali druge tekoče snovi in poboljšujejo biološko trajnost lesa in les ščitijo pred glivami, plesnimi, insekti in/ter/ ali odpornost na ogenj ali poboljšujejo mehanske lastnosti. Izum spada v področje postopkov zaščite in modifikacije lesa.The invention relates to a process of flowing vacuum / suction impregnation of veneer as a way of introducing different liquid substances into the depth of wood mass of each veneer sheet separately. Liquid substances can be aqueous solutions of inorganic or organic substances / chemicals or other liquid substances and improve the biological sustainability of wood and protect the wood against fungi, mold, insects and / and / or fire resistance or improve mechanical properties. The invention relates to the field of wood protection and modification processes.

Opis tehničnega problema:Description of the technical problem:

Za doseganje določenih poboljšanih lastnosti lesa/fumirja in izdelkov kot so fumime plošče je potrebno snovi in njihove pripravke kot so vodne raztopine vnesti v globino lesne mase furnirja.In order to achieve certain improved properties of wood / fumir and products such as fumime boards, substances and their preparations such as aqueous solutions must be introduced into the depth of the veneer mass.

Znane rešitve impregnacije furnirja z različnimi vodnimi/tekočimi pripravki uporabljajo stacionarne postopke v avtoklavih/kotlih, ki se praviloma uporabljajo in ustrezajo impregnaciji elementov masivnega lesa kot so letve, tramovi, deske, po vakuumsko tlačnih metodah/postopkih z velikimi količinami pripravka, to je od 10 do 30 m3. V primeru vodnih raztopin zaradi nižjih temperatur, ker se praviloma večjih količin 10-30 m3 vode ne segreva na višje temperature, so pripravki nizkih koncentracij, torej od 10 do 20%, odvisno od vrste topljenca/pripravka/ soli/kemikalij e.Known veneer impregnation solutions with various aqueous / liquid preparations use stationary processes in autoclaves / boilers, which are generally used and correspond to the impregnation of solid wood elements such as laths, beams, planks, by vacuum pressure methods / processes with large volumes of the preparation, i.e. 10 to 30 m 3 . In the case of aqueous solutions due to lower temperatures, because as a rule larger quantities of 10-30 m3 of water do not heat up to higher temperatures, the preparations are of low concentrations, ie 10 to 20%, depending on the type of solute / preparation / salt / chemicals e.

Pri veliki količini zloženega furnirja je težava tudi v dostopnosti pripravka do lesa saj se furnir zaradi majhne debeline ne da ločiti z vmesnimi letvicami kot elemente masivnega lesa. Uporablja se tudi postopek namakanja v bazenih z tekočim pripravkom. Količine pripravka so lahko pri postopku namakanja manjše, običajno od 4 do 10 m3, vendar je čas potreben da pripravek difundira v lesno maso lahko zelo dolg, to je 6 in več ur. Običajno se v bazenu namaka večjo količino fumirskih listov, običajno od 1 do 2 m3. Zaradi velikih količin furnirja je problematična enakomernost vnosa snovi v globino lesne mase furnirja.In the case of large quantities of folded veneer, the availability of the preparation to the wood is also a problem, since the veneer cannot be separated by means of slats as solid wood elements due to its small thickness. The irrigation process in pools with a liquid preparation is also used. The amounts of the preparation may be smaller during the irrigation process, typically from 4 to 10 m 3 , but the time required for the preparation to diffuse into the wood mass can be very long, ie 6 hours or more. Usually, a large amount of fumir leaves are irrigated in the pool, usually from 1 to 2 m 3 . Due to the large quantities of veneer, it is problematic for the material to be introduced evenly into the depth of the veneer mass.

-2Zato se je pokazala potreba po izboljšanju postopka impregnacije z metodo ki omogoča enakomeren kontroliran vnos snovi in pripravkov v globino lesne mase furnirja ki bi omogočil uporabo višjih koncentracij pripravkov in uporabo manjših količin pripravka.-2Therefore, there has been a need to improve the impregnation process by a method that allows the controlled introduction of substances and preparations into the wood veneer depth, which would allow the use of higher concentrations of preparations and the use of smaller quantities of the preparation.

Postopek pretočne vakuumske/sesalne impregnacije furnirja po pričujočem izumu omogoča vnašanje različnih tekočih snovi v globino lesne mase vsakega lista furnirja posebej z možnostjo uporabe višjih koncentracij pripravkov in uporabo manjših količin pripravka.The process of flowing vacuum / suction impregnation of veneer according to the present invention allows the introduction of different liquid substances into the depth of wood mass of each veneer sheet separately, with the possibility of using higher concentrations of preparations and using smaller amounts of the preparation.

Stanje tehnike:State of the art:

Tehnični problem ki ni zadovoljivo rešen je velike količine pripravka z nizko koncentracijo aktivnih snovi in/ali dolgi časi impregnacije, ter veliko postrojenje z velikim vložkom/porabo energije . Sicer je v patentu US 5.512,098 prikazana rešitev vakuumske impregnacije fumiija ki impregnira posamezno vsak fumirski list, vendar je postopek stacionaren in je naprava v bistvu mali avtoklav.A technical problem that is not satisfactorily solved is the large amount of the preparation with low concentration of active substances and / or long impregnation times, and a large plant with high input / energy consumption. Otherwise, U.S. Pat. No. 5,512,098 discloses a vacuum-impregnation solution for fumigate-impregnating individually, but the process is stationary and is essentially a small autoclave.

Opis nove rešitveDescription of the new solution

Naloga in cilj pričujočega izuma je postopek, ki omogoča uporabo manjših količin pripravka brez velikih zalog pripravka, z višjo koncentracijo v primeru vodnih raztopin, z uporabo naprave, ki omogoča hitro in učinkovito globinsko izvedbo vnosa pripravka v lesno maso furnirja s transportom/pretokom turnirskega lista skozi napravo.The object and object of the present invention is to provide a process that allows the use of smaller volumes of the preparation without large stockpiles of the preparation, with higher concentration in the case of aqueous solutions, using a device that enables the rapid and efficient deep introduction of the preparation into the wood of the veneer by the transport / flow of the tournament sheet through the device.

Opis izumaDescription of the invention

Po pričujočem izumu je naloga rešena z postopkom pretočne vakuumsko/sesalne impregnacije z izkoriščanjem poroznost lesa, še posebej tankega lesa kot je furnir.According to the present invention, the problem is solved by a vacuum / suction impregnation process by exploiting the porosity of wood, especially thin wood such as veneer.

Postopek pretočnega vakuumsko sesalnega impregniranja furnirja rešuje probleme stacionarnih vakuumsko tlačnih postopkov impregnacije in omogoča:The vacuum suction impregnation process of the veneer solves the problems of stationary vacuum pressure impregnation processes and enables:

- aplikacijo pripravka na vsak list furnirja posebej- application of the preparation to each sheet of veneer separately

- uporabo manjših količin pripravkov vodnih raztopin kemikalij- use of small quantities of preparations of aqueous solutions of chemicals

- uporabo pripravkov/snovi v višjih koncentracijah- use of preparations / substances in higher concentrations

Pričujoči izum bo opisan s pomočjo izvedbenega primera postopka vakuumsko/sesalne impregnacije furnirja in slik, ki prikazujejo:The present invention will be described by way of an exemplary vacuum / suction impregnation of veneer and pictures showing:

-3Slika 1: Shematski simbolni prikaz naprave za pretočno vakuumsko/sesalno impregnacijo furnirja z pripravno enoto priprave impregnacijskega pripravka.-3Figure 1: Schematic symbolic representation of a veneer vacuum / suction impregnation device with impregnation preparation unit.

Slika 2: podroben prikaz fumiijal v vakuumsko/sesalnem delu naprave osnovne impregnacijske enote 400.Figure 2: Detailed representation of the fumi in the vacuum / suction section of the basic impregnation unit 400.

Postopek po izumu pretočne vakuumske/sesalne impregnacije furnirja se sestoji iz naprave ki vsebuje naslednje osnovne enote:The process according to the invention of the vacuum / suction impregnation of veneer consists of a device comprising the following basic units:

- impregnacijska enota 400 ki vsebuje: sesalne šobe 410, spodnje transportne valje 420, zgornje transportne valje 39,- impregnation unit 400 comprising: suction nozzles 410, lower conveyor rollers 420, upper conveyor rollers 39,

-enota za ustvarjanje ustreznega vakuuma/podtlaka 300 ki vsebuje: vakuumsko črpalko 8 za dosego učinkovitega sesanja, posodo 7 za viške pripravka ,- a unit for generating a suitable vacuum / vacuum 300 comprising: a vacuum pump 8 to achieve effective suction, a container 7 for excess preparations,

- krmilni ventil 5 kot vmesni člen med impregnacijsko enoto 400 in enoto za ustvarjanje ustreznega vakuuma/podtlaka 300,- control valve 5 as an intermediate between the impregnation unit 400 and the corresponding vacuum / vacuum generating unit 300,

- aplikator pripravka 50 za nanos pripravka na odprto stran la furnirja 1, ki lahko glede na vrsto in gostoto pripravka pripravek nanese na furnir 1 z brizganjem, valjčnim nanosom, polivanjem- applicator of preparation 50 for applying the preparation to the open side of the veneer 1, which, depending on the type and density of the preparation, can be applied to the veneer 1 by injection molding, roller application, pouring

- enota 20 z zalogo ali pripravo impregnacijskega pripravka,- unit 20 with the stock or preparation of the impregnation preparation,

- krmilni ventil 23 za doziranje pripravka iz enote 20 z zalogo pripravka v aplikator pripravka 50,- a control valve 23 for dispensing the preparation from unit 20 with the stock of the preparation into the applicator of the preparation 50,

- transportna enota 37 za transport furnirja skozi aplikator pripravka 50 do vhoda v impregnacijsko enoto 400,- conveyor unit 37 for transporting the veneer through the applicator of the preparation 50 to the inlet of the impregnation unit 400,

- transportna enota 38 na izhodni strani impregnacijske enote 400.- transport unit 38 on the outlet side of the impregnation unit 400.

Postopek na napravi za pretočno vakuumsko/sesalno impregnacijo furnirja poteka kot sledi. Furnir 1 potuje po transportni napravi 37 ki je lahko transportni trak ali mrežni transportni trak z zgornjimi transportnimi valji 40 ki dodatno vodijo/usmeijajo turnirski list 1 v aplikator 50 pripravka.The process on the veneer vacuum / suction impregnation unit is as follows. The veneer 1 travels on a conveyor device 37 which may be a conveyor belt or a net conveyor belt with the upper conveyor rollers 40 which further guide / laugh the tourniquet sheet 1 into the applicator 50 of the preparation.

Senzor 60, ki je lahko fotocelica in se nahaja na začetku transportne naprave 37 v programiranem časovnem zamiku vključi/odpre aplikatorje 50, ki impregnacijski pripravek v ustrezni količini nanesejo na odprto stran la furnirja 1, to je tista stran fumiija 1, ki je pridobljen z luščenjem ali rezanjem na strani noža, ki lušči ali reže furnir. Furnir pred opisanim pretočnim vakuumsko sesalnim postopkom impregnacije ima praviloma vsebnost vode izpod TNCS, kar je cca 30 % .The sensor 60, which may be a photocell and located at the beginning of the transport device 37 in a programmed time delay, activates / opens applicators 50, which in an appropriate amount are applied to the open side of the veneer 1, that is, the side of the fumi 1 obtained by peeling or cutting on the side of a knife that peels or cuts the veneer. The veneer prior to the vacuum impregnation vacuum suction process described above generally has a water content below TNCS, which is approximately 30%.

-4Po nanosu ustrezne količine impregnacijskega pripravka na površino la furnirja 1 vstopi list furnirja 1 v osnovno impregnacijsko enoto 400.-4 Upon application of an appropriate amount of impregnation preparation to the surface of the veneer 1, the sheet of veneer 1 enters the basic impregnation unit 400.

Posamezen fumirski list 1 s tlačno stranjo lb to je stranjo od tlačne letve pri izdelavi rezanju luščenju, obrnjeno v vakuumsko sesalne šobe 410, kjer se ustvari podtlak z vakuumsko črpalko 8 in povzroči sesanje pripravka, ki se nahaja na odprti strani la furnirja lin zaradi tlačne razlike, torej podtlaka, prodira v globino lesa furnirja. Vakuumsko sesalne šobe 410 segajo čez celo širino osnovne impregnacijske enote 400. Število šob je odvisno od: vrste lesa, debeline furnirja in impregnacijskega sredstva.A single fumigation sheet 1 having a pressure side lb, that is, a side of the pressure strip in the manufacture of a peeling cut, turned into a vacuum suction nozzle 410, where a vacuum pump 8 is created and causes the suction of the product located on the open side of the veneer lin due to the pressure the difference, that is, the pressure, penetrates the depth of the veneer. Vacuum suction nozzles 410 extend over the entire width of the basic impregnation unit 400. The number of nozzles depends on: the type of wood, veneer thickness and impregnation agent.

Vakuumsko sesalno podtlačni učinek impregnacije zagotavlja enota 300 za ustvarjanje ustreznega vakuuma/podtlaka z vakuumsko črpalko 8, za dosego učinkovitega sesanja impregnacijskega sredstva v globino lesa furnirja 1. Ustreznost vakuuma uravnava krmilni ventil 5 kot vmesni člen med impregnacijsko enoto 400 in enoto za ustvarjanje ustreznega vakuuma/podtlaka 300 preko vmesne merilne kontrolne naprave 440, ki glede na vrednost pred nastavljenega podtlaka/vakuuma krmili sesanje z odpiranjem in zapiranjem.Vacuum suction pressure impregnation effect is provided by unit 300 to create adequate vacuum / vacuum pressure with vacuum pump 8, to achieve effective suction of impregnating agent into the depth of veneer wood. / vacuum 300 via an intermediate measuring control 440, which controls the suction by opening and closing, depending on the value before the set vacuum / vacuum.

Fumirski list 1 preko transportne naprave transportni trak 38 z pritisnimi transportnimi valji 41 zapusti impregnacijsko enoto 400.The fumigation sheet 1 exits the impregnation unit 400 via a conveyor conveyor belt 38 with pressure rollers 41.

Enota 20 je opcijska: na napravo 400 se lahko priključi preko krmilnega ventila 23 za doziranje pripravka recimo IBC kontejner z že pripravljeno snovjo.Unit 20 is optional: it can be connected to the device 400 via a control valve 23 for dispensing a preparation such as an IBC container with a substance already prepared.

Enota 20 za pripravo impregnacijskega pripravka se lahko uporablja v primeru predpriprave impregnacijskega sredstva npr. z redčenjem z vodo ali drugimi topili. Topilo vstopi preko ventila 11 in če je potrebno se v enoti 15 ustrezno obdela npr. tako, da se segreje na višjo temperaturo in v tlačni enoti 14 poveča pritisk zaradi boljšega mešanja v mešalni enoti 13. V zalogovni enoti 19 se nahaja prašna oblika impregnanta ki se preko dozirne enote 16 dozira v mešalno enoto 13. Pripravljen impregnacijski pripravek se vskladišči v posodi 18. Preko krmilnjenega ventila 23 se pripravek preko aplikatorja 50 nanese na furnir.The impregnation preparation unit 20 may be used in the case of pre-preparation of the impregnating agent e.g. by dilution with water or other solvents. The solvent enters via valve 11 and, if necessary, is properly treated in unit 15 e.g. by heating to a higher temperature and increasing the pressure in the pressure unit 14 due to better mixing in the mixing unit 13. In the storage unit 19 there is a powder form of impregnator which is dosed through the dosing unit 16 into the mixing unit 13. The prepared impregnation preparation is stored in container 18. The preparation is applied to the veneer via the control valve 23 via the applicator 50.

Po izumu je mogoča sprotna priprava impregnacijskega pripravka v manjših količinah. V primeru vodnih raztopin je zaradi ogrevanja manjših količin vode mogoče ogrevaanje impregnacijskega pripravka na višje temperature, vendar ne čez vrelišče vode, kar vpliva na doseg višje koncentracije pripravka. Višje koncentracije so lahko v pričujočem izumu tik pod mejo nasičenosti. Znano je da meja nasičenosti z temperaturo topila/vode narašča, zato je potrebno za vsak pripravek določiti mejo med temperaturo in koncentracijo.According to the invention, it is possible to prepare the impregnation preparation in small quantities on an ongoing basis. In the case of aqueous solutions, due to the heating of smaller amounts of water, it is possible to heat the impregnation preparation to higher temperatures, but not beyond the boiling point of the water, which affects the reach of a higher concentration of the preparation. Higher concentrations may be just below the saturation limit of the present invention. It is known that the limit of saturation with the temperature of the solvent / water increases, so it is necessary to determine the limit between temperature and concentration for each preparation.

Claims (4)

PATENTNI ZAHTEVKIPATENT APPLICATIONS 1. Postopek pretočne vakuumske/sesalne impregnacije furnirja kot načina vnašanja različnih tekočih snovi v globino lesne mase vsakega lista furnirja posebej, kjer so tekoče snovi lahko vodne raztopine anorganskih ali organskih snovi/kemikalij ali druge tekoče snovi in poboljšujejo biološko trajnost lesa in les ščitijo pred glivami, plesnimi, insekti in/ali odpornost na ogenj ali poboljšujejo mehanske lastnosti, označen s tem, da furnir (1) potuje po transportni napravi (37) v aplikator (50) pripravka kjer se impregnacijski pripravek nanese na odprto stran (la) furnirja (1), nakar vstopi v impregnacijsko enoto (400) tako, daje s tlačno stranjo (lb) obrnjen v vakuumsko sesalne šobe (410) kjer podtlak povzroči sesanje pripravka iz odprte površine (la) in prodiranje v globino lesa fumiija (1).1. The process of flowing vacuum / suction impregnation of veneer as a way of introducing different liquid substances into the depth of wood mass of each veneer sheet, where the liquid substances can be aqueous solutions of inorganic or organic substances / chemicals or other liquid substances and improve the biological sustainability of the wood and protect the wood from fungi, molds, insects and / or resistance to fire or to improve mechanical properties, characterized in that the veneer (1) travels through the conveyor device (37) into the applicator (50) of the preparation where the impregnation preparation is applied to the open side (la) of the veneer (1), then enters the impregnation unit (400) so that, with the pressure side (1b), it is turned into the vacuum suction nozzles (410) where the pressure causes the product to suck from the open surface (1a) and penetrate into the depth of the fumi wood (1). 2. Postopek po zahtevku 1, označen s tem, da aplikator pripravka (50) opravi nanos pripravka z brizganjem, valjčnim nanosom ali polivanjem.Method according to claim 1, characterized in that the applicator of the preparation (50) performs the application of the preparation by injection molding, roller application or pouring. 3. Naprava za izvajanje postopka po zahtevku 1, označena s tem, da vsebuje transportno napravo (37) ki vodi fumirski list (1) v aplikator (50), pri čemer senzor (60) ki se nahaja na začetku transportne naprave (37) v programiranem časovnem zamiku vključi/odpre aplikatorje aplikatorja (50) in po nanosu impregnacijskega pripravka vstopi list furnirja (1) v impregnacijsko enoto (400) z vakuumskimi sesalnimi šobami (410) kjer je ustvarjen podtlak z vakuumsko črpalko (8), pri čemer vakuumsko sesalne šobe (410) segajo čez celo širino impregnacijske enote (400).Apparatus for carrying out the process according to claim 1, characterized in that it comprises a transport device (37) which guides the fumigation sheet (1) to the applicator (50), the sensor (60) being located at the beginning of the transport device (37) at the programmed time delay, activate / open the applicator applicators (50) and, after applying the impregnation preparation, enter the veneer sheet (1) into the impregnation unit (400) with vacuum suction nozzles (410) where vacuum is created by vacuum pump (8), suction nozzles (410) extend over the entire width of the impregnation unit (400). 4. Postopek po zahtevku 1, označen s tem, da poteka priprava impregnacijskega pripravka sprotno v manjših količinah in večjih koncentracijah in v primeru vodnih raztopin zaradi ogrevanja na višje temperature, vendar ne čez vrelišče vode, pri čemer so višje koncentracije prednostno tik pod mejo nasičenosti.Method according to claim 1, characterized in that the preparation of the impregnation preparation is carried out in smaller quantities and in higher concentrations and in the case of aqueous solutions for heating to higher temperatures, but not beyond the boiling point of the water, the higher concentrations being preferably just below the saturation limit .
SI201300093A 2013-04-11 2013-04-11 The process of continous vacuum/suction veneer impregnation SI24340A (en)

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PCT/SI2013/000070 WO2014168588A1 (en) 2013-04-11 2013-11-18 The process of continuous vacuum/suction veneer impregnation

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CH605065A5 (en) * 1976-05-06 1978-09-29 Fischer Ag Brugg Georg
US4869198A (en) * 1988-09-30 1989-09-26 Union Tool Corporation Vacuum debubbler machine
FI20096037A0 (en) * 2009-10-08 2009-10-08 Upm Kymmene Wood Oy Impregnation of chemicals into wood

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