Evaluation of Dynamic Contact Angle of Loose and Tight Sides of Thermally Compressed Birch Veneer

Bekhta, Pavlo; Krystofiak, T.; Proszyk, S.; Lis, B.

doi:10.5552/drind.2018.1826

Cited by 7 publications

(4 citation statements)

References 18 publications

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“…The work [ 59 ] reports a significant increase in hydrophobicity of a heat-treated beech wood surface at 200 °C, which was reflected in contact angle values bigger than 90°. Worsened wetting of heat-treated modified beech wood was also observed by other authors [ 60 , 61 ].…”

Section: Resultssupporting

confidence: 80%

Influence of Irradiation Parameters on Structure and Properties of Oak Wood Surface Engraved with a CO2 Laser

2022

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The work investigates the effects of CO2 laser parameters (laser power and raster density) on wood mass loss in oak wood and impacts on its morphology, chemical structure, and surface properties (colour and hydrophilicity). The energy amount supplied onto the wood surface with a laser beam under different combinations of the irradiation parameters was expressed through a single variable—total irradiation dose. The mass loss was confirmed as linear-dependent on the irradiation dose. With the mass reduction, the roughness was enhanced. The roughness parameters Ra and Rz increased linearly with the mass loss associated with the increasing irradiation dose. The FTIR (Fourier transform infrared spectroscopy) spectroscopy also detected chemical changes in the main wood components, influencing primarily the wood colour space. Conspicuous discolouration of the engraved wood surface was observed, occurring just at the minimum laser power and raster density. The additional increasing of laser parameters caused a novel colour compared to the original one. The detected dependence of wood discolouration on the total irradiation dose enables us to perform targeted discolouration of the oak wood. The engraved surfaces manifested significantly better wettability with standard liquids, both polar and non-polar, and higher surface energy values. This guarantees appropriate adhesion of film-forming materials to wood. Identification of the changes in wood surface structure and properties, induced by specific CO2 laser-treatments, is important for obtaining targeted discolouration of the wood surface as well as for the gluing or finishing of the surfaces treated in this way.

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Section: Resultssupporting

confidence: 80%

Influence of Irradiation Parameters on Structure and Properties of Oak Wood Surface Engraved with a CO2 Laser

2022

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“…Numerous studies have reported that the surface wettability of thermally treated wood is reduced due to degradation of hygroscopic components (especially hemicellulose) (Hakkou et al 2005;Esteves et al 2007;Kocaefe et al 2008;Candan et al 2012;Bakar et al 2013;Chu et al 2016;Gérardin 2016). The compression temperature increase causes an increase in the contact angle, which is consistent with findings of previous studies (Diouf et al 2011;Ünsal et al 2011;Bekhta and Krystofiak 2016;Bekhta et al 2018). After the densification processes, depending on the compression ratio and temperature, the contact angle of untreated, paraffin, linseed oil, and styrene-impregnated specimens increased up to 23%, 56%, 46%, and 71% for aspen wood, and up to 24%, 42%, 51%, and 68% for fir wood, respectively.…”

Section: Fig 2 Roughness Values Of Impregnated and Densified Wood Spe...supporting

confidence: 90%

Roughness, wettability, and morphological properties of impregnated and densified wood materials

Pelit

Arısüt

2022

BioRes

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The effects of pre-impregnation on surface roughness, wettability, and morphological structure of densified aspen and fir wood were investigated. Wood specimens were impregnated with paraffin, linseed oil, and styrene after pre-vacuum treatment. The impregnated specimens were densified using compression ratios of 20% and 40% at 120 °C, 150 °C, and 180 °C. The roughness decreased and the contact angle increased in all impregnated specimens (undensified and densified). Compared to paraffin and linseed oil-impregnated specimens, lower roughness and higher contact angle were found in styrene-impregnated specimens. After densification, the roughness and wettability of the wood specimens decreased. More successful results (lower roughness and higher contact angle) were generally obtained in specimens densified with high compression ratio (40%). In both untreated and impregnated specimens, the contact angle increased with increasing compression temperature. While the effect of compression temperature on the roughness of the fir specimens was not significant, the roughness of the aspen specimens (especially styrene-impregnated) decreased with the increase in temperature. Scanning electron microscopy observations indicated that impregnation agents (especially styrene) clung to wood cell walls and partially or completely filled the lumens. This was positively correlated with the determined roughness and wettability. Pre-impregnation facilitated wood densification without significant cell deformations.

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“…Adhesive quality is a critical component that must be meticulously evaluated during the production of laminated timber products [ 1 ]. In the manufacturing of wood products, surface preparation is a critical step preceding the gluing or finishing procedures [ 2 , 3 , 4 , 5 ]. Sanding is a method that is frequently employed in this process.…”

Section: Introductionmentioning

confidence: 99%

Surface Roughness, Dynamic Wettability, and Interphase of Modified Melamine Formaldehyde-Based Adhesives on Jabon Wood

Amin,

Nugroho,

Bahtiar

et al. 2024

Polymers

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The surface roughness and wettability of wood are critical aspects to consider when producing laminated wood products with adhesive applications. This study aims to investigate the surface roughness and dynamic wettability of Jabon wood in the presence of melamine formaldehyde (MF)-based adhesives. Commercial MF adhesives (MF-0) and modified MF adhesives (MF-1) were applied to Jabon wood, which includes tangential (T), radial (R), and semi-radial (T/R) surfaces. The surface roughness of Jabon wood was assessed using a portable stylus-type profilometer. The low-bond axisymmetric drop shape analysis (LB-ADSA) method was employed to identify the contact angle (θ) of the MF-based adhesives on Jabon wood. The wettability was determined by evaluating the constant contact angle change rate (K value) using the Shi and Gardner (S/G) model. Dynamic mechanical analysis (DMA) was employed to investigate the viscoelastic characteristics of the interphase analysis of the wood and MF-based adhesives. The roughness level (Ra) of the Jabon board ranged from 5.62 to 6.94 µm, with the T/R having a higher level of roughness than the R and T. MF-0 exhibited a higher K value (0.262–0.331) than MF-1 (0.136–0.212), indicating that MF-0 wets the surface of Jabon wood more easily than MF-1. The wood–MF-0 interphase reached a maximum stiffness of 957 N/m at 123.0 °C, while the wood–MF-1 had a maximum stiffness of 2734 N/m at 110.5 °C. In addition, the wood–MF-0 had a maximum storage modulus of 12,650 MPa at a temperature of 128.9 °C, while the wood–MF-1 had a maximum storage modulus of 22,950 MPa at 113.5 °C.

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Evaluation of Dynamic Contact Angle of Loose and Tight Sides of Thermally Compressed Birch Veneer

Cited by 7 publications

References 18 publications

Influence of Irradiation Parameters on Structure and Properties of Oak Wood Surface Engraved with a CO2 Laser

Influence of Irradiation Parameters on Structure and Properties of Oak Wood Surface Engraved with a CO2 Laser

Roughness, wettability, and morphological properties of impregnated and densified wood materials

Surface Roughness, Dynamic Wettability, and Interphase of Modified Melamine Formaldehyde-Based Adhesives on Jabon Wood

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