Surface Modification of Wood by Laser Irradiation

Wust, Hendrik; Panzner, Michael; Wiedemann, Günter; Henneberg, K.; Pöppel, Lars; Wittke, T.-H.

doi:10.1007/978-3-642-56965-4_28

Cited by 2 publications

(5 citation statements)

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“…The wood density variability, both intra-and inter-species, can be acknowledged a an important factor influencing the surface roughness in the engraving process with a CO laser, in line with other work [1][2][3]8,28].…”

Section: Roughness Of Wood Surfaces Engraved With a Co2 Lasersupporting

confidence: 78%

“…To avoid multifaceted evaluation of the impacts of all the tested laser parameters on the changes in structure and properties of the tested wood surface, all these parameters were replaced with a single variable-the total irradiation dose (H) determined according to Equation (1). The irradiation dose per unit surface area of the samples (at specified parameter values) were calculated according to the given equation and are summarised in Table 1.…”

Section: Total Irradiation Dose and Wood Mass Losses Corresponding To...mentioning

confidence: 99%

“…After this treatment, structural changes occur on the surface of the wood, accompanied by melting and formation of a carbonised layer. This is reflected in altered wood surface morphology, discolouration and changes in other surface properties [1][2][3][4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…Changes in the lignin structure and an increase in non-polar C-C and C-H bonds were also observed. These chemical changes are also dependent on the wood species [1][2][3][4]8,17].…”

Section: Introductionmentioning

confidence: 99%

“…This energy is possible to control via adjustment of the laser power, the movement speed of the laser head, focal distance and raster density [2,4,7,8,12,19,24,26]. Apart from the energy amount, the thickness of the sublimated layer and the changes in the engraved surface structure are dependent on the wood species, and also on structural heterogeneity occurring within a single species [1][2][3]7,8,11,27,28].…”

Section: Introductionmentioning

confidence: 99%

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The Effect of CO2 Laser Engraving on the Surface Structure and Properties of Spruce Wood

Kúdela,

Andrejko,

Kubovský

2023

Coatings

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This work appraises the influence of CO2 laser irradiation on mass loss, morphology, chemical changes and discolouration of spruce wood surfaces. The amount of energy applied to the surface was expressed as the total irradiation dose, which was demonstrated to have a strong impact on increasing wood weight loss. Along with increasing mass loss, surface roughness also increased, resulting from the differences in density between the early wood and late wood. The evaluated roughness parameters increased linearly with increasing irradiation dose and mass loss. At the maximum irradiation dose, the Ra parameter value parallel to the fibre direction showed a 6-fold increase; perpendicular to the grain, the increase was as much as 33.5-fold. Similar differences were also observed for the parameter Rz. At the lowest laser power and the lowest raster density, the engraved spruce wood surface exhibited some evidence of discolouration (ΔE* ≅ 9). An additional increase in the amount of supplied energy clearly resulted in a novel surface colour compared to the original (ΔE* = 12). The chemical analysis of the wood surface revealed that the discolouration was mainly caused by heat-induced cleavage of C=O groups in the lignin and hemicellulose structures. Part of these structures (so-called chromophores) are responsible for the natural colour of the wood as well as for colour changes caused by engraving. The detected dependences of the wood mass loss and colour values on the total radiation dose are the basis for achieving targeted modifications of spruce wood surfaces using a laser beam.

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Section: Roughness Of Wood Surfaces Engraved With a Co2 Lasersupporting

confidence: 78%

Section: Total Irradiation Dose and Wood Mass Losses Corresponding To...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Changes in the lignin structure and an increase in non-polar C-C and C-H bonds were also observed. These chemical changes are also dependent on the wood species [1][2][3][4]8,17].…”

Section: Introductionmentioning

confidence: 99%