EP0481179A1 - Procédé pour faire accentuer à haute contraste la structure veinée naturelle d'un bois pâle aux moyens d'un rayonnement infra-rouge - Google Patents

Procédé pour faire accentuer à haute contraste la structure veinée naturelle d'un bois pâle aux moyens d'un rayonnement infra-rouge Download PDF

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Publication number
EP0481179A1
EP0481179A1 EP91113083A EP91113083A EP0481179A1 EP 0481179 A1 EP0481179 A1 EP 0481179A1 EP 91113083 A EP91113083 A EP 91113083A EP 91113083 A EP91113083 A EP 91113083A EP 0481179 A1 EP0481179 A1 EP 0481179A1
Authority
EP
European Patent Office
Prior art keywords
wood
heat
grain
contrast
infrared radiation
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.)
Ceased
Application number
EP91113083A
Other languages
German (de)
English (en)
Inventor
Jürgen Dr. Günter
Siegfried Köhler
Siegfried Lang
Luise Dr. Schellhorn
Erwin Lutz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Daimler Benz AG
Mercedes Benz AG
Original Assignee
Daimler Benz AG
Mercedes Benz AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Daimler Benz AG, Mercedes Benz AG filed Critical Daimler Benz AG
Publication of EP0481179A1 publication Critical patent/EP0481179A1/fr
Ceased legal-status Critical Current

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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
    • 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
    • B27K5/003—Treating of wood not provided for in groups B27K1/00, B27K3/00 by using electromagnetic radiation or mechanical waves
    • B27K5/005—Laser-light
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27M—WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
    • B27M1/00—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching
    • B27M1/06—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching by burning or charring, e.g. cutting with hot wire
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44C—PRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
    • B44C1/00—Processes, not specifically provided for elsewhere, for producing decorative surface effects
    • B44C1/005—Processes, not specifically provided for elsewhere, for producing decorative surface effects by altering locally the surface material
    • 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
    • B27K5/003—Treating of wood not provided for in groups B27K1/00, B27K3/00 by using electromagnetic radiation or mechanical waves

Definitions

  • the invention relates to a method for the near-surface, high-contrast emergence of the early wood portion compared to the late wood portion in the grain pattern of a low-contrast in the original state, preferably an approximately uniformly light-colored wooden part according to the preamble of claim 1, as is known, for example, from the so-called flaming of wood in wood technology .
  • the wood is first charred close to the surface and then the charred layer is brushed off again, with the softer early wood portion being removed more by brushing and appearing bright again, whereas the harder late wood portion is less strong is removed and thus not only stands out plastically, but also in terms of color contrast with the early wood.
  • This type of wood treatment is useful for a rustic appearance of wooden objects, where very strong color contrasts and a very strong surface modeling of the grain pattern are important. This tanning technique is not possible for objects for which a smooth surface is desired.
  • Touching tanning processes for emphasizing a high-contrast grain on pale wooden objects are also known, but mostly hot stamping is used here.
  • a new and stereotypical grain pattern is hot-embossed into a uniformly light and superficially structured wood, whereby due to a targeted non-uniformity of the temperature distribution and / or the surface pressure during the embossing process, not only a surface structuring but also a different heat input and, accordingly, a more or less strong browning is achieved.
  • the disadvantage here is that only a stereotypical grain pattern corresponding to the embossing stamp can be produced, but that the natural grain of the wood itself cannot be emphasized.
  • Another touching tanning process works with heated rollers, between which the veneer sheet is let through, whereby the softer early wood parts are browned more than the harder late wood parts.
  • a disadvantage of this method is that the grain pattern appears locally unevenly strong, which may be attributed not only to locally different thicknesses of the veneer sheet, but also to local differences in moisture within the veneer sheet.
  • original light and initially invisible traces of sanding of the wood appear clearly in the browned grain. It can be used to treat veneer sheets that are very uniformly thick and have a very fine finish on the surface. Despite all this, only a very low color contrast can be achieved.
  • a veneer sheet 1 can be moved past in the conveying direction 2 relative to a stationary laser optics 12.
  • a monochromatic high-energy laser basic beam 10 of a carbon dioxide laser resonator is fed to the laser optics 12, which has a relatively long wavelength of 10.6 ⁇ m in the infrared light range and thus represents infrared light.
  • the basic laser beam 10 extends as far as the laser optics 12 in a tube 11 surrounding it.
  • the laser optics produce a focused laser beam 7 with a focus 8, the focused laser beam 7 extending beyond the focus 8 as which fans out into a divergent beam 9.
  • the laser optics 13 are arranged at such a large distance from the surface of the veneer sheet 1 that the focused laser beam only strikes the veneer sheet 1 with its relatively large focal spot 5 with its diverging beam portion 9.
  • this focal spot 5 can be moved back and forth over the veneer sheet with a high-frequency pendulum movement 6 oriented transversely to the conveying direction 2, so that the thermal energy can be fed practically to the entire veneer sheet width at the height of the laser optics 12.
  • the laser optics 12 do not need to be pivoted themselves, but the laser basic beam 10 is already supplied to the laser optics 12 in a corresponding pendulum movement by means of a rapidly oscillating deflecting mirror, so that the focused beam emerging from the laser optics in the desired manner even when the lens is stationary commutes. Thanks to the large distance between the focal spot 5 and the laser optics 12, it is also possible to achieve relatively large oscillation distances, ie working distances. In order to avoid a distance-related and oblique angle-related drop in energy towards the edge despite the oscillation of the beam 9, it is conceivable to clamp the veneer sheet in a concentric manner to the pendulum movement in a channel-shaped cylindrical manner.
  • Another possibility of ensuring an equally high beam intensity in the edge region despite the beam oscillation is to reduce the pendulum speed towards the edge or to increase the beam power depending on the pendulum-related beam deflection towards the edge.
  • the process parameters are correctly coordinated, which will be discussed in more detail below, the intrinsic grain of the veneer sheet can be emphasized in high contrast with a single pass, as is indicated in the figure.
  • the part 3 of the veneer sheet that has already run past the laser optics 12 is clearly drawn in its grain, whereas the untreated part 4 of the veneer sheet that has not yet passed is still pale and uniformly bright.
  • the browning is achieved in the softer early wood parts, whereas the harder late wood parts are not browned at all or at most only very little.
  • a veneer sheet made of ash wood with the external dimensions of 115 x 66 cm was treated.
  • a defocused, diverging laser beam from a carbon dioxide laser with a focal spot diameter of 11 cm was directed onto the surface.
  • the wavelength of the monochronmatic beam was 10.6 ⁇ m.
  • the laser beam had an output of 1700 watts; it was not mode-free, but had an uneven distribution of energy with three concentric circular maxima of its energy density across the beam cross-section.
  • the laser beam was not oscillated transversely to the feed direction, but was moved parallel to itself in the feed direction, whereas the veneer sheet was held stationary.
  • the infrared light range includes rays with wavelengths from 0.78 to 1000 ⁇ m.
  • a normal infrared emitter with a narrow band spectrum of the wavelength of 1 to 2.5 ⁇ m and the laser beam of a neodymium YAG laser with monochromatic infrared light and a wavelength of 1.06 ⁇ m were also tried out for tanning. It has been found that the longer wavelength the infrared light is, the better the contrasts are. The best contrasts were achieved with the carbon dioxide laser, which is relatively expensive to buy and in operating costs due to the poor efficiency. It therefore makes sense to run a mixed operation by preheating the wood with a conventional infrared heater that is inexpensive to buy and maintain, and performing the actual contrasting with less laser energy expenditure using a less powerful carbon dioxide laser.
  • beam integrators which allow the beam cross section to be changed to a rectangular or square shape; with such beam integrators it may be possible the energy density of the beam can also be changed in a suitable manner, for example to constant energy density in the entire beam cross section or to an increased energy density in the edge region.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Electromagnetism (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Laser Beam Processing (AREA)
EP91113083A 1990-10-19 1991-08-03 Procédé pour faire accentuer à haute contraste la structure veinée naturelle d'un bois pâle aux moyens d'un rayonnement infra-rouge Ceased EP0481179A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4033255U 1990-10-19
DE4033255A DE4033255C2 (de) 1990-10-19 1990-10-19 Verfahren zum kontrastreichen Hervorheben des Frühholzanteiles gegenüber dem Spätholzanteil im Maserungsbild eines im Originalzustand kontrastarmen Holzteiles durch Wärmeeinwirkung

Publications (1)

Publication Number Publication Date
EP0481179A1 true EP0481179A1 (fr) 1992-04-22

Family

ID=6416642

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91113083A Ceased EP0481179A1 (fr) 1990-10-19 1991-08-03 Procédé pour faire accentuer à haute contraste la structure veinée naturelle d'un bois pâle aux moyens d'un rayonnement infra-rouge

Country Status (3)

Country Link
US (1) US5190791A (fr)
EP (1) EP0481179A1 (fr)
DE (1) DE4033255C2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2789436A1 (fr) * 2013-04-11 2014-10-15 Flooring Technologies Ltd. Procédé et dispositif de traitement d'au moins une surface d'une pièce en bois ou en matériau dérivé du bois
CN119952292A (zh) * 2025-03-19 2025-05-09 江苏东巨机械科技有限公司 基于激光定位的木工机械高精度切割工艺

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5352495A (en) * 1989-02-16 1994-10-04 The Wiggins Teape Group Limited Treatment of a surface by laser energy
SE9400934L (sv) * 1994-03-21 1995-09-22 Joachim W O Seltman Förfarande och anordning för att erhålla en träyta med frilagd cellstruktur
DE19718287C1 (de) * 1997-04-30 1998-06-10 Fraunhofer Ges Forschung Verfahren zur Modifizierung von Holzoberflächen
DE19745706B4 (de) * 1997-10-16 2005-06-02 Technische Universität Dresden Verfahren zur Herstellung eines Bauteils aus Holz
ES2168195B1 (es) * 2000-02-11 2003-06-16 Garcia Jose Luis Lopez Procedimiento para dotar a un mueble de pino de un acabado envejecido o de estilo.
DE10158521B4 (de) * 2001-11-29 2005-06-02 Wacker-Chemie Gmbh In Teilbereichen oder vollständig verglaster SiO2-Formkörper und Verfahren zu seiner Herstellung
JP3935798B2 (ja) * 2002-07-31 2007-06-27 オリンパス株式会社 電子機器のための筐体構成用素材
DE10260320B4 (de) * 2002-12-20 2006-03-30 Wacker Chemie Ag Verglaster SiO2-Formkörper, Verfahren zu seiner Herstellung und Vorrichtung
CN101107105B (zh) 2005-02-23 2012-07-04 地板材料工业有限公司 用于制造地板块的方法以及通过该方法获得的地板块
ITMI20051208A1 (it) * 2005-06-27 2006-12-28 Ettore Colico Metodo e apparecchiatura per il trasferimento di immagini su un supporto in legno mediante un fascio laser
US8071912B2 (en) * 2005-11-16 2011-12-06 Technolines, Lp Engineered wood fiber product substrates and their formation by laser processing
US8216644B2 (en) * 2006-11-02 2012-07-10 Purdue Research Foundation Controlling wood staining and color during post-harvest processing
US8585956B1 (en) 2009-10-23 2013-11-19 Therma-Tru, Inc. Systems and methods for laser marking work pieces
JP2015193149A (ja) * 2014-03-31 2015-11-05 パナソニックＩｐマネジメント株式会社 木質部材の製造方法及び木質部材
CN111015870A (zh) * 2019-12-30 2020-04-17 大亚(江苏)地板有限公司 一种木地板的表面处理方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2527564B1 (de) * 1975-06-20 1976-07-22 Otfried Hasse Kg Verfahren und Vorrichtung zum Erzeugen eines der natuerlichen Struktur entsprechenden Reliefs an der Oberflaeche von Holz
EP0157530A2 (fr) * 1984-03-29 1985-10-09 Timber Textures (Uk) Limited Traitement du bois
GB2189367A (en) * 1986-04-21 1987-10-21 Kanzaki Paper Mfg Co Ltd Producing a laser-printed picture

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US317730A (en) * 1885-05-12 And charles f
AT9072B (de) * 1901-02-27 1902-09-10 Max Schirm Verfahren, um die Maserung des Holzes plastisch hervortreten zu lassen.
CH181021A (fr) * 1934-02-08 1935-11-30 Grisard Jean Procédé de vieillissement artificiel des bois.
CH204313A (de) * 1938-06-15 1939-04-30 Boehringer Alphons Holzelement zur Herstellung von Verkleidungen, Baukonstruktionen, Möbeln, Bilderrahmen und dergl. und Verfahren zur Herstellung des Holzelementes.
US2375113A (en) * 1942-01-21 1945-05-01 W M Ritter Lumber Company Method of applying finishes to the surfaces of wood or other porous materials
DE1083159B (de) * 1956-08-09 1960-06-09 Friedhelm Boehle Verfahren zur Oberflaechenveredelung von Holz
US2867543A (en) * 1956-10-22 1959-01-06 Western Sealant Dev Corp Wood impregnating and coloring process
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Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
DE2527564B1 (de) * 1975-06-20 1976-07-22 Otfried Hasse Kg Verfahren und Vorrichtung zum Erzeugen eines der natuerlichen Struktur entsprechenden Reliefs an der Oberflaeche von Holz
EP0157530A2 (fr) * 1984-03-29 1985-10-09 Timber Textures (Uk) Limited Traitement du bois
GB2189367A (en) * 1986-04-21 1987-10-21 Kanzaki Paper Mfg Co Ltd Producing a laser-printed picture

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 3, no. 80 (M-65)11. Juli 1979 & JP-A-54 056 576 ( TOKYO SHIBAURA DENKI K.K. ) 5. Juli 1979 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2789436A1 (fr) * 2013-04-11 2014-10-15 Flooring Technologies Ltd. Procédé et dispositif de traitement d'au moins une surface d'une pièce en bois ou en matériau dérivé du bois
CN119952292A (zh) * 2025-03-19 2025-05-09 江苏东巨机械科技有限公司 基于激光定位的木工机械高精度切割工艺

Also Published As

Publication number Publication date
US5190791A (en) 1993-03-02
DE4033255A1 (de) 1992-04-23
DE4033255C2 (de) 1994-02-24

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