DK173653B1

DK173653B1 - Method and apparatus for surface treatment of wooden objects

Info

Publication number: DK173653B1
Application number: DK199801228A
Authority: DK
Inventors: Poul Erik Jespersen
Original assignee: Poul Erik Jespersen
Priority date: 1998-09-29
Filing date: 1998-09-29
Publication date: 2001-05-21
Also published as: DK199801228A

Description

i DK 173653 B1in DK 173653 B1

Den foreliggende opfindelse angår en fremgangsmåde til overfladebehandling af træemner omfattende pudsning og lakering af emnet med henblik på etablering af en lakforsynet overflade, hvorved i det mindste et overfladelag af emnet opvarmes til en temperatur på 60°C eller derover. Opfindelsen angår ligeledes et apparat til brug ved 5 en sådan overfladebehandling.The present invention relates to a method for surface treatment of wood blanks comprising polishing and varnishing the blank to establish a lacquered surface, whereby at least one surface layer of the blank is heated to a temperature of 60 ° C or greater. The invention also relates to an apparatus for use in such a surface treatment.

I mange anvendelsessituationer ønskes træemner bibragt en lakforsynet overflade. En sådan overflade kan være ønskelig af hensyn til slid eller støvegenskaber. Et fælles ønske er etablering af en glat overflade.In many application situations, woodpieces are desired to have a lacquered surface. Such a surface may be desirable for wear or dust properties. A common desire is the establishment of a smooth surface.

1010

Almindeligvis vil der forud for lakering af træemner foretages en bearbejdning af træet. Denne bearbejdning kan omfatte en ovntørring af træet, således at det nedbringes et fugtighedsindhold på 6-12 %. Alternativt kan træet også lufttørres.Generally, prior to varnishing woodwork, the wood will be machined. This machining may include an oven drying of the wood so as to reduce a moisture content of 6-12%. Alternatively, the wood can also be air dried.

15 Efter træemneme er tørrede vil de almindeligvis blive slebet og høvlet, hvorefter de får en grundlak. Efter grundlakken er hærdet foretages en yderligere pudsning for at fjerne de træfibre, som har rejst sig, og for at skabe en overflade, som muliggør vedhæftning af et eller flere efterfølgende laklag. Der foretages eventuelt en yderligere grundlakering og yderligere mellempudsning. Alternativt foretages der efter den første 20 grundlakering og pudsning en toplakering. Toplakeringen bibringer træemnet en glat overflade, idet toplakken placeres ovenpå grundlakken, og derfor ikke giver anledning til fiberrejsning. Herefter er træemnet klar til brug.15 After the woodpieces are dried, they will usually be sanded and planed, after which they will be given a base coat. After the base lacquer is cured, a further plaster is made to remove the raised wood fibers and to create a surface which allows adhesion of one or more subsequent lacquer layers. Optionally, a further primer is applied and additional intermediate polishing. Alternatively, after the first 20 basic coatings and polishing, a top coat is made. The topcoat gives a smooth surface to the woodwork as the topcoat is placed on top of the basecoat and therefore does not give rise to fiber erosion. After that, the woodpiece is ready for use.

I forbindelse med naturlige træsorter optræder der en variation i egenskaberne, som 25 nødvendiggør en eller flere grundlakeringer, og som kan nødvendiggøre anvendelsen af større eller mindre lakmængde for at etablere den glatte lakforsynede overflade. I forbindelse med fiberplader, for eksempel såkaldte MDF-plader, har det vist sig vanskeligt at etablere en lakforsynet overflade, især hvis træemnet er forsynet med profileringer i form af udfræsede spor, kanter og lignende.In the case of natural woods, there is a variation in the properties which necessitate one or more base coatings and which may necessitate the use of greater or less varnish of varnish to establish the smooth varnished surface. In connection with fiber boards, for example so-called MDF boards, it has proved difficult to establish a lacquered surface, especially if the wood blank is provided with profiling in the form of milled grooves, edges and the like.

Ved MDF-plader har det således været vanskeligt at foretage pudsning med tilstrækkeligt gode egenskaber. Dette har bevirket, at der i visse situationer foretages en 30 2 DK 173653 B1 brænding i de profilerede spor for at fjerne de rejste fibre. Dette er en vanskelig og uønsket proces, som man ønsker at undgå.Thus, with MDF boards, it has been difficult to make polishing with sufficiently good properties. This has led in certain situations to burn in the profiled grooves to remove the raised fibers. This is a difficult and undesirable process that one wants to avoid.

En teknik, som omtalt indledningsvis, kendes fra norsk patentskrift nr. 124298. Fra 5 dette skrift er det kendt at foretage en hurtig opvarmning af overfladelag af træet med hensyn til opnåelse en kraftig fugtuddrivning fra træet. Ifølge det norske skrift foretages den hurtige udtørring som en forberedelse, hvor de øvrige dele af materialet får lov at bibeholde en ønsket fugtighed. Herved kan en efterfølgende lakpåføring fa mulighed for at trænge ned i den udtørrede overflade, inden fugtighed fra materialets indre 10 når op til materialets overflade. Den varme, som er akkumuleret i dybden af træet, anvendes efterfølgende til udtørring af en lak, som påføres overfladen. Ifølge den teknik, som er beskrevet, erkender man ikke mulighed for at reducere mellempudsninger og anvende en mindre lakmængde ved behandling af træemner.A technique, as mentioned at the outset, is known from Norwegian Patent Specification No. 124298. From this document it is known to perform a rapid heating of surface layers of the wood in order to obtain a strong moisture expulsion from the wood. According to Norwegian writing, the rapid desiccation is made as a preparation in which the other parts of the material are allowed to retain a desired moisture. Hereby, a subsequent varnish application may be allowed to penetrate the dried surface before moisture from the interior of the material 10 reaches the surface of the material. The heat accumulated in the depth of the wood is subsequently used to dry a varnish applied to the surface. According to the technique described, it is not recognized to reduce intermediate sanding and to use a smaller amount of varnish when treating wood blanks.

15 Det er formålet med den foreliggende opfindelse at anvise en ny fremgangsmåde samt et apparat til brug ved overfladebehandling af træemner for på enkel måde at etablere en lakforsynet overflade med høj kvalitet og med mindre behov for mellempudsning og mindre lakforbrug, og som kan anvendes til træemner af råtræ eller af pressede fibre.It is the object of the present invention to provide a novel method and apparatus for use in surface treatment of woodpieces in order to easily establish a high-quality lacquered surface with less need for intermediate polishing and less varnish consumption and which can be used for woodpieces. of raw wood or of pressed fibers.

2020

Dette opnås ifølge den foreliggende opfindelse med en fremgangsmåde af den indledningsvis nævnte type, som er særpræget ved, - at emnet umiddelbart derefter, medens overfladelaget endnu ikke er afkølet nævneværdigt, 25 - pudses således at kun en del af nævnte overfladelag fjernes samt - lakeres medens den resterende del af overfladelaget stadig er varmt, og - at laklaget hærdes.This is achieved in accordance with the present invention by a method of the type mentioned initially, which is characterized in that - immediately afterwards, while the surface layer has not yet cooled down significantly, 25 - is polished so that only part of said surface layer is removed and - coated while the remaining part of the surface layer is still warm, and - the lacquer layer is cured.

Apparatet til brug ved fremgangsmåden er særpræget ved, at det omfatter opvarm-30 ningsorganer, pudseorganer, lakpåføringsorganer samt hærdeorganer, der alle er anbragt i nævnte rækkefølge efter hinanden, fortrinsvis inden for en omslutning, hvori der kan etableres et kontrolleret miljø, at opvarmningsorganeme er indrettet for en 3 DK 173653 B1 momentan opvarmning af et overfladelag af træemneme, og fortrinsvis omfatter IR-lamper, at pudseorganerne er af typen med pudselameller, der er understøttet af børster, at lakpåføringsorganeme er valgt blandt valsepåføringsorganer, sprøjteorganer og penselorganer, og al hærdeorganeme omfatter en UV-ovn, en tørreovn eller tilsvaren-5 de, afhængigt af den anvendte laktype.The apparatus for use in the method is characterized in that it comprises heating means, plaster means, varnish application means and hardening means, all arranged in said sequence one after the other, preferably within an enclosure in which a controlled environment can be established, that the heating means are arranged for a instantaneous heating of a surface layer of wooden blanks, and preferably IR lamps comprise the brushing means being of the type with brushes supported by brushes, the varnish applying means being selected from roller applying means, spraying means and brushing means, and all curing means comprises a UV furnace, a drying oven or the like, depending on the type of lacquer used.

Det har vist sig, at der ved en meget kraftig og hurtig opvarmning af træemnets overfladelag til en temperatur på 60° eller derover, afhængig af trætypen, sker en meget kraftig uddrivning af fugten i træet samtidig med, at der optræder en fiberrejsning.It has been found that by very vigorous and rapid heating of the wood layer's surface layer to a temperature of 60 ° or more, depending on the type of wood, a very vigorous expulsion of the moisture in the wood occurs while a fiber erosion occurs.

1010

Til forskel fra den kendte teknik er det med den foreliggende opfindelse muligt at reducere mellempudsninger og lakforbrug ved, at emnet umiddelbart efter opvarmningen, medens overfladelaget endnu ikke er afkølet, pudses, således at en del af fibrene samt en del af et varmt overfladelag herved fernes.Contrary to the prior art, it is possible with the present invention to reduce intermediate coatings and varnish consumption by polishing the blank immediately after heating, while the surface layer is not yet cooled, so that a portion of the fibers as well as a portion of a hot surface layer are removed. .

1515

Den træoverflade, som herefter resterer, lakeres umiddelbart derefter, medens den endnu er varm, og inden den har fået mulighed for at absorbere fugtighed fra luften.The remaining wood surface is then painted immediately thereafter while it is still warm and before being allowed to absorb moisture from the air.

Det har overraskende vist sig, at der herved skabes en glat lakflade uden fiberrejsning.Surprisingly, it has been found that this creates a smooth lacquer surface without fiber erosion.

20 Det har derfor vist sig muligt at undgå efterfølgende mellempudsninger og efterlake-ringer med yderligere grundlak eller toplak. Efter et sådant enkelt laklag er påført den endnu varme overflade, kan træemnet føres til en UV-ovn eller tørreovn for hærdning af lakken på traditionel måde.Therefore, it has been found possible to avoid subsequent intermediate coatings and repaintings with additional base coat or topcoat. After such a single lacquer layer is applied to the even hot surface, the wood blank can be fed to a UV furnace or drying furnace for curing the lacquer in the traditional manner.

25 Fremgangsmåden ifølge opfindelsen kan anvendes i forbindelse med UV-lakker, vandbaserede lakker eller cellulosebaserede lakker.The method of the invention can be used in conjunction with UV lacquers, water-based lacquers or cellulose-based lacquers.

Ved pudsningen er det væsentligt, at der ikke fjernes for meget materiale fra overfladen. Pudsningen må således kun foretages ned i en del af det opvarmede overfladelag.When polishing, it is essential that not too much material is removed from the surface. The polishing may thus only be done in a part of the heated surface layer.

30 Et egnet værktøj til brug ved pudsningen er kombinerede pudsehoveder bestående af pudselameller, der er understøttet af børster. Børsterne kan udover funktionen som støttebørster tillige deltage i pudseoperationen afhængigt af de valgte børstetyper.30 A suitable tool for use in polishing is combined brush heads consisting of brushes supported by brushes. In addition to the support brush function, the brushes can also participate in the brushing operation depending on the brush types chosen.

4 DK 173653 B14 DK 173653 B1

For at kunne styre temperaturen i overfladelaget foretrækkes det, at opvarmning, pudsning og lakering foretages i et kontrolleret miljø. Ved at anvende en afdækning over de forskellige apparatdele bliver det muligt at reducere varmetabet og samtidig reducere risikoen for, at luftfugtighed absorberes i træoverfladen imellem pudsningen 5 og lakeringen.In order to control the temperature of the surface layer, it is preferable that heating, polishing and lacquering be done in a controlled environment. By using a cover over the various appliance parts, it becomes possible to reduce the heat loss and at the same time reduce the risk of humidity being absorbed into the wood surface between the plaster 5 and the coating.

I praksis har det vist sig muligt at reducere lakforbruget med op til 70%. Ved fyrretræ Λ har det således vist sig muligt at reducere lakforbruget fra 30 gram/m til ca. 9-12 gram/m2.In practice, it has been found possible to reduce paint consumption by up to 70%. Thus, for pine Λ it has been possible to reduce lacquer consumption from 30 grams / m to approx. 9-12 grams / m2.

10 I praksis vil opvarmningen ske i et overfladelag med en tykkelse på mellem 0,3 og 1 mm. Dette har vist sig tilstrækkeligt til at sikre en bibeholdelse af temperatumiveauet i overfladelaget ved den efterfølgende pudsning og lakering, således at træet ikke suger fugt fra omgivelserne. Ved pudsningen er det blot nødvendigt at fjerne de rejste træfi-15 bre samt nogle fa μιη af overfladelaget.In practice, heating will take place in a surface layer having a thickness of between 0.3 and 1 mm. This has been shown to be sufficient to maintain the temperature level of the surface layer during subsequent polishing and lacquering so that the wood does not absorb moisture from the surroundings. In the polishing process, it is only necessary to remove the raised wood fibers and some of the surface layer.

Det er især ved anvendelse af grundlak, hvor der traditionelt er et stort forbrug, at det er muligt at foretage en reducering af lakforbruget. I visse situationer vil en enkel grundlakering være tilstrækkelig, og der vil ikke være behov for efterfølgende topla-20 kering. Imidlertid kan der i specielle anvendelsessituationer for træemnet være ønske om etablering af specielle slidstærke laklag, og det vil derfor være muligt at foretage efterpudsning og påføring af et eller flere yderligere laklag for at opnå de ønskede overfladeegenskaber for træemnet. Imidlertid vil den mellempudsning, der skal foretages, være en meget let pudsning, som blot skal etablere en ruhed i overfladen, som 25 muliggør det efterfølgende laklags vedhæftning. Der vil således være et reduceret energibehov til mellempudsning.Especially when using base varnish, where there is traditionally a large consumption, it is possible to reduce the varnish consumption. In some situations, a simple base coat will be sufficient and no subsequent top coat will be required. However, in special application situations for the woodwork, it may be desirable to establish special durable lacquers, and it will therefore be possible to repaint and apply one or more additional lacquers to achieve the desired surface properties for the woodwork. However, the intermediate polishing to be done will be a very light polishing which merely establishes a roughness in the surface which allows the subsequent varnish to be adhered. Thus, there will be a reduced energy requirement for intermediate polishing.

Til opvarmningen anvendes fortrinsvis IR-Iamper, som har en kraftig effekt, og som etablerer en meget hurtig opvarmning i overfladelaget uden behov for opvarmning af 30 de underliggende lag i træemnet. Det er således muligt at udføre opvarmningen med et begrænset energiforbrug.The heating is preferably used for IR lamps which have a powerful effect and which establishes a very rapid heating in the surface layer without the need for heating the underlying layers in the woodwork. Thus, it is possible to perform the heating with a limited energy consumption.

5 DK 173653 B1 I praksis har fremgangsmåden ifølge opfindelsen vist sig særlig fordelagtig i forbindelse med harpiksholdige knaster. Dette har især været et problem i fyrretræ. Det har vist sig muligt med fremgangsmåden ifølge opfindelsen at opnå en god vedhæftning af lak ovenpå knaster. Det antages, at dette forhold skyldes, at harpiksen, som befinder 5 sig i overfladelaget, koger op og hærdes. Ved pudsningen tages kun en del af denne harpiks, og den harpiks der befinder sig i den resterende del af overfladelaget vil hærde og danne en prop, som begrænser en efterfølgende udsivning af harpiksen og deraf følgende risiko for frigørelse af lakken.In practice, the method according to the invention has proved particularly advantageous in connection with resinous cams. This has especially been a problem in pine. It has been found possible with the method according to the invention to obtain a good adhesion of lacquer on top of cams. This ratio is believed to be due to the resin present in the surface layer boiling and curing. During the polishing, only part of this resin is taken and the resin present in the remaining part of the surface layer will cure and form a plug which limits subsequent leakage of the resin and consequent risk of release of the lacquer.

10 Det har ligeledes vist sig, at efterfølgende misfarvninger i laklaget, som er forårsaget af udtrædende fugt fra træet, er reduceret i træemnet, der er behandlet ved fremgangsmåden ifølge opfindelsen.It has also been found that subsequent discolourations in the varnish layer caused by moisture leaving the wood are reduced in the wood blank treated by the method of the invention.

Med fremgangsmåden ifølge opfindelsen er det således ikke alene muligt at spare lak 15 og reducere energiforbrug til pudsning, men det er tillige muligt at opnå en bedre kvalitet i det dannede laklag.Thus, with the method of the invention, it is not only possible to save varnish 15 and reduce energy consumption for polishing, but it is also possible to achieve a better quality in the formed varnish layer.

Opfindelsen vil herefter blive forklaret nærmere under henvisning til den medfølgende skematiske figur, hvor 20 fig. 1 viser et skematisk sidebillede af et apparat ifølge opfindelsen, og fig. 2 illustrerer partielle billeder af et træemne med forskellige trin i bearbejnings-metoden ifølge opfindelsen.The invention will then be explained in more detail with reference to the accompanying schematic figure, in which FIG. 1 shows a schematic side view of an apparatus according to the invention, and FIG. 2 illustrates partial images of a wood blank having different steps in the machining method of the invention.

25 I fig. 1 er illustreret et apparat, som benyttes til overfladebehandling af træemner 1.In FIG. 1 is illustrated an apparatus used for surface treatment of wood blanks 1.

Kun et træemne er vist placeret på et transportbånd 2, der løber omkring enderuller 3 med en bevægelse i pilens retning 4. Apparatet omfatter en kasse 5, der er anbragt ovenover transportbåndet 2 og efterlader en spalte, som muliggør træemneme 1 's passage ind under kassen 5. Kassen 5 indeholder opvarmningsorganer 7 i form af IR-30 lamper. Endvidere er der tilvejebragt en pudsemaskine 8, der er forsynet med et eller flere pudsehoveder 9 af typen med pudselameller, der er understøttet af børster. Pudsehovedet 9 eller pudsehovedeme 9 kan være tilvejebragt med forskellig orientering.Only one wood blank is shown located on a conveyor belt 2 running around end rollers 3 with a movement in the direction of the arrow 4. The apparatus comprises a box 5 disposed above the conveyor belt 2 leaving a slot allowing the woodworkers 1 to pass underneath. box 5. Box 5 contains heating means 7 in the form of IR-30 lamps. Furthermore, a brush machine 8 is provided which is provided with one or more brush heads 9 of the type with brushes supported by brushes. The pad head 9 or the pad heads 9 may be provided with different orientation.

6 DK 173653 B16 DK 173653 B1

Apparatet omfatter endvidere en lakpåføringsstation 10. Lakpåføringsstationen er forsynet med et antal dyser 11 til at sprøjte lak over træemnet, når dette endnu i varm tilstand passerer under lakpåføringsstationen 10. Efter passage ud af kassen 5 kan træemnet I overføres til en hærdestation, som er indikeret ved 12. Hærdestationen kan 5 være en UV-ovn, en tørreovn eller en tilsvarende hærdestation afhængig af den anvendte laktype.The apparatus further comprises a varnish application station 10. The varnish application station is provided with a plurality of nozzles 11 for spraying varnish over the woodpiece as it still passes warmly under the varnishposting station 10. After passing out of the box 5, the woodpiece I can be transferred to a curing station which is indicated. at 12. The curing station may be a UV oven, a drying oven or a corresponding curing station depending on the type of lacquer used.

Selv om der er illustreret et transportbånd 2 til fremføring af træemneme, vil det være muligt at fremføre emnerne på anden vis. Det vil således være muligt at anvende slæ-10 de- eller skinneføringer. Dette kan i visse situationer være fordelagtigt med henblik på korrekt positionering af emnet i forhold til pudsehovederne 9, således at der ikke fjernes for meget materiale i det opvarmede overfladelag.Although there is illustrated a conveyor belt 2 for feeding the wooden blanks, it will be possible to convey the blanks differently. Thus, it will be possible to use sliding or rail guides. This may be advantageous in certain situations for proper positioning of the workpiece relative to the cleaning heads 9 so that not too much material is removed in the heated surface layer.

IR-lamperne vil være dimensioneret, så de kan opvarme et overfladelag med en tyk-15 kelse mellem 0,3 og 1 mm til en temperatur på ca. 60° ved træemnets passage.The IR lamps will be sized so that they can heat a surface layer with a thickness between 0.3 and 1 mm to a temperature of approx. 60 ° at the passage of the woodpiece.

I fig. 2 er der i rækkefølge illustreret de forskellige trin til overfladebehandling af træemnet ved fremgangsmåden ifølge opfindelsen. Træemnet fremføres i pilens retning 4 igennem behandlingsprocesserne. Der er øverst illustreret en proces, hvor et overflade-20 lag 13 opvarmes. Herved vil fibre 14 rejse sig fra overfladen, samtidig med at fugt, som er indikeret ved 15, vil fordampe/trænge ud fra overfladelaget 13 henholdsvis fibrene 14.1 et efterfølgende behandlingstrin bliver det opvarmede og udtørrede overfladelag 13 samt de rejste fibre 14 pudset, således at en del af overfladelaget 13 fjer nes. Herefter resterer et opvarmet overfladelag 16.In FIG. 2, the various steps for surface treatment of the woodpiece are sequentially illustrated by the method according to the invention. The wood blank is advanced in the direction of arrow 4 throughout the processing processes. A process is illustrated at the top where a surface layer 13 is heated. In this way, fibers 14 will rise from the surface, while moisture indicated at 15 will evaporate / penetrate from the surface layer 13 and fibers 14, respectively. In a subsequent treatment step, the heated and dried surface layer 13 and the raised fibers 14 will be plastered so that part of the surface layer 13 feathers. Thereafter, a heated surface layer 16 remains.

2525

Det resterende overfladelag 16, der stadig befinder sig i en opvarmet og tør tilstand bliver derefter lakeret. Det dannede laklag 17 vil fremstå med en glat overflade uden fiberrejsning, som ellers ville opstå på grund af den fugt, der er tilført via lakken. Emnet vil således efter det sidste behandlingstrin, der er illustreret i fig. 2, kunne føres til 30 et hærdetrin, hvor der foregår en hærdning afhængig af den valgte laktype. Træemnet vil herefter have en overflade 17, der er forsynet med laklaget, og være klar til brug.The remaining surface layer 16, which is still in a heated and dry state, is then painted. The formed lacquer layer 17 will appear with a smooth surface without fiber erosion which would otherwise occur due to the moisture supplied through the lacquer. Thus, after the last processing step illustrated in FIG. 2, a curing step could be advanced to 30, where curing takes place depending on the type of lacquer selected. The wood blank will then have a surface 17 provided with the lacquer layer and be ready for use.

7 DK 173653 B1 I figurerne er der illustreret et træemne l med en glat overflade. Imidlertid kan appara-tet og fremgangsmåden også anvendes i forbindelse med træemner, der har en profileret overflade, idet de er forsynet med spor, som danner forskellige mønstre i træemnets overflade. I sådanne spor vil der dannes et opvarmet overfladelag og optræde en 5 effekt, som beskrevet i det plane overfladelag i træemnet 1. Der kan således også dannes en overflade, der er forsynet med lak i bunden af sporene.7 DK 173653 B1 The figures illustrate a wooden blank 1 with a smooth surface. However, the apparatus and method can also be used in connection with woodpieces having a profiled surface, provided with grooves which form different patterns in the woodpiece's surface. In such grooves, a heated surface layer will form and an effect will occur, as described in the planar surface layer in the woodpiece 1. Thus, a surface provided with varnish may be formed at the bottom of the grooves.

Apparatet og fremgangsmåden, der er illustreret, kan anvendes i forbindelse med emner af råtræ eller emner, der er fremstillet af fiber/pulver samt såkaldte MDF-plader.The apparatus and method illustrated can be used in connection with blanks of raw wood or blanks made of fiber / powder as well as so-called MDF boards.

Claims

A method of surface treatment of wood blanks comprising polishing and varnishing the blank to establish a lacquered surface, wherein at least one surface layer of the blank is heated to a temperature of 60 ° C or more, characterized in that - the blank immediately thereafter while the surface layer has not yet cooled appreciably, - is plastered so that only part of said surface layer is glued and - lacquered while the remaining part of the surface layer is still warm and 10. that the lacquer layer is hardened.

A method according to claim 1, characterized in that the heating is instantaneous with a strong source of energy, preferably IR lamps, so that the wood fibers in the surface are dried, so that the polishing is done immediately thereafter, so that wooden fibers raised during drying do not reach to absorb moisture from the surroundings, and that varnishing is also done before the recessed surface sucks moisture from the surroundings.

Process according to claim 1 or 2, characterized in that the surface layer is heated to a temperature between 60 and 70 ° C. 20

Method according to claim 1, 2 or 3, characterized in that the heating, polishing and lacquering are carried out in a controlled environment. Method according to any one of the preceding claims, characterized in that the heating is carried out to heat a surface layer having a thickness between 0.3 and 1 mm, preferably between 0.3 and 0.5 mm. and that the polishing is performed so that less than 0.1 mm is removed, and preferably only a few µm of the surface layer. DK 173653 B1

Method according to any one of the preceding claims, characterized in that the brushing is done with brushing means comprising brushes which are supported by brushes participating in the brushing.

Method according to any one of the preceding claims, characterized in that the treatment is carried out on woodpieces having a profiled surface and that the woodpieces can be selected from different types of wood as well as MDF items.

Process according to any one of the preceding claims, characterized in that lacquer is applied to form a lacquer layer with a thickness of down to 7 g / m 2.

Method according to claim 8, characterized in that post-polishing and application of one or more additional lacquer layers is carried out.

Apparatus for surface treatment by a method according to claim 1, characterized in that it comprises heating means, plaster means, varnish application means and hardening means, all arranged in said sequence one after the other, preferably within an enclosure in which a controlled environment can be established. said heating means being arranged for instantaneous heating of a surface layer of wooden blanks, and preferably IR lamps comprising said brushing means being of the type with brushes supported by brushes, said varnish applying means being selected from roller applying means, spraying means and brushing means; and that the curing means comprise a UV furnace, a drying oven or the like, depending on the type of lacquer used.