Freilegen der Holzstruktur durch UV-Bestrahlung

Seltman, J.

doi:10.1007/s001070050076

Cited by 32 publications

(6 citation statements)

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“…On the other hand, Haller et al [60] investigated the effects of laser irradiation on wood in terms of structural, chemical, and physical characteristics and determined the laser parameters that prevent pyrolysis and melting of wood. Subsequently, Sandberg [61], Johansson et al [62] observed a melted surface when treating aged pine and spruce samples with UV laser ablation [63,64]. Bianchi et al [65] described an attempt to fabricate a glued spruce slat panel by linear friction welding.…”

Section: Optimization By Thermal Modification and Chemical Treatments...mentioning

confidence: 99%

A Review of the Advances Made in Improving the Durability of Welded Wood against Water in Light of the Results of African Tropical Woods Welding

Biwôlé¹,

Biwolé²,

Pizzi³

et al. 2023

Journal of Renewable Materials

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Wood plays a major role in the production of furniture and wooden structures. Nevertheless, in this process, the massive use of adhesives and plural connectors remains a definite problem for health and the environment. Therefore, wood welding is a breakthrough in this respect. This paper reviews the applications of wood welding in furniture and construction and then examines advances in improving the durability of welded wood against water. Our contribution also highlights the need to join African tropical woods using the rotational friction welding technique. According to our results, these woods present interesting chemical singularities, which could provide solutions to the water vulnerability of the welded wood. Moreover, the use of such a joining method would first free the Cameroonian furniture industry from the chemical industry, secondly position it at the forefront of new eco-design trends and thirdly make it competitive with other countries in the Central African sub-region. These works enrich the long and rich bibliography on the technique of wood welding, which has long been conspicuous by its absence of tropical woods.

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Section: Optimization By Thermal Modification and Chemical Treatments...mentioning

confidence: 99%

A Review of the Advances Made in Improving the Durability of Welded Wood against Water in Light of the Results of African Tropical Woods Welding

Biwôlé¹,

Biwolé²,

Pizzi³

et al. 2023

Journal of Renewable Materials

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“…The MWBL consists of damaged cells on the wood surface, caused by mechanical treatment of the surface (Johansson 1994). Seltman has shown (Seltman 1995) that it is possible to ablate (Stafast 1993) a wood surface by means of laserirradiation -laser ablation -and in that way remove the damaged layer of cells.…”

Section: Introductionmentioning

confidence: 98%

Laser Ablation of Machined Wood Surfaces. 1. Effect on End-Grain Gluing of Pine (Pinus silvestris L.) and Spruce (Picea abies Karst.)

Stehr¹,

Seltman²,

Johansson³

1999

Holzforschung

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This report describes two attempts to test the effect of removing the layer of damaged cells -the mechanical weak boundary layer. In both trials, the wood has been laser ablated using different types of lasers with different wavelengths. The goal has been to determine whether the glue joint strength is influenced by the mechanical weak boundary layer and to show how the laser wavelength affects the glue joint strength. The statistical evaluation of the results shows however no great differences between glue joints made of ablated and glue joints made of unablated surfaces. Nor are there any real differences between the different lasers and different wavelengths. This may be because there are indeed no differences between ablated and unablated surfaces, in terms of a mechanical weak boundary layer, but it may also be due to cracks which occurred in the wood specimens, and it is also possible that the glue itself was too weak. An ESEM (Environmental Scanning Electron Microscope) -analysis showed that fracture occurred primarily in the glueline and not in the boundary layer. In addition to the ESEM analysis and the statistical evaluation, a theoretical FEM (Finite Element Method) -analysis has been used to explain the crack initiation in the second trial. Holzforschung 53 (1999) 93-103 Holzforschung / Vol. 53 / 1999 / No. 1

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“…However, long pulses, or continuous-wave laser ablation, lead to a large heat-affected zone with melting of the wood components and carbonization [ 35 , 36 ]. UV laser irradiation is reported as a method to open the machined wood surface for glue or coating agents [ 37 ]. Recent experiments with a UV laser and pulse duration of a few nanoseconds showed no change in the texture of wood although heat accumulation of the laser pulses can lead to carbonization [ 38 ].…”

Section: Introductionmentioning

confidence: 99%

Femtosecond laser machining for characterization of local mechanical properties of biomaterials: a case study on wood

Jakob

Pfeifenberger

Hohenwarter

et al. 2017

Science and Technology of Advanced Materials

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The standard preparation technique for micro-sized samples is focused ion beam milling, most frequently using Ga+ ions. The main drawbacks are the required processing time and the possibility and risks of ion implantation. In contrast, ultrashort pulsed laser ablation can process any type of material with ideally negligible damage to the surrounding volume and provides 4 to 6 orders of magnitude higher ablation rates than the ion beam technique. In this work, a femtosecond laser was used to prepare wood samples from spruce for mechanical testing at the micrometre level. After optimization of the different laser parameters, tensile and compressive specimens were produced from microtomed radial-tangential and longitudinal-tangential sections. Additionally, laser-processed samples were exposed to an electron beam prior to testing to study possible beam damage. The specimens originating from these different preparation conditions were mechanically tested. Advantages and limitations of the femtosecond laser preparation technique and the deformation and fracture behaviour of the samples are discussed. The results prove that femtosecond laser processing is a fast and precise preparation technique, which enables the fabrication of pristine biological samples with dimensions at the microscale.

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Freilegen der Holzstruktur durch UV-Bestrahlung

Cited by 32 publications

References 0 publications

A Review of the Advances Made in Improving the Durability of Welded Wood against Water in Light of the Results of African Tropical Woods Welding

A Review of the Advances Made in Improving the Durability of Welded Wood against Water in Light of the Results of African Tropical Woods Welding

Laser Ablation of Machined Wood Surfaces. 1. Effect on End-Grain Gluing of Pine (Pinus silvestris L.) and Spruce (Picea abies Karst.)

Femtosecond laser machining for characterization of local mechanical properties of biomaterials: a case study on wood

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