WOOD RESEARCH Volume 71, Number 1, 2026
Przemysław Mania, MIŁOSZ STASIAK, and EWA SKRODZKA

The Effect of Top Soundboard Thickness on Violin Modal Parameters

This study investigates the impact of top soundboard thickness on the modal parameters of violins. By analysing variations in plate thickness, the research explores how these changes influence modal frequencies, damping characteristics, and overall acoustic properties. Findings indicate that increased thickness results in lower modal frequencies and better damping, which may affect sound quality. The study references established research on violin acoustics and discusses the structural implications of varying plate thicknesses, particularly concerning the effects of string tension. These insights contribute to a deeper understanding of violin construction and offer potential guidelines for optimising instrument design to achieve desired tonal qualities.

WOOD RESEARCH Volume 61, Number 6, 2016
Xuexia Zhang, Yan Yu, Zehui Jiang, and Hankun Wang

Influence of thickness and moisture content on the mechanical properties of microfibrillated cellulose (MFC) films

Microfibrillated cellulose (MFC) films with a layered structure and controlled thickness were successfully prepared, from bamboo processing resides as the source material, using ultrasonication followed by simple vacuum filtration. The effects of thickness and moisture content on the mechanical properties of the films were then investigated. It was shown that tensile stress and elongation at break were notably affected by the thickness of the MFC film, where the tensile stress and elongation at break of the film increased from 124 to 179 MPa and 0.9 to 5.5 %, respectively, as film thickness increased from 7.4 to 205.4 μm. However, no notable effect of thickness was observed on the Young’s modulus (~10.8 GPa). It was also found that moisture content has a significant impact on the tensile properties of MFC films, in lowering the Young’s modulus from 12 to 2 GPa and tensile stress from 180 to 90 MPa, and increasing the elongation at break from 4.2 to 17.5 %, as moisture content increased from 3 to 60 %. This is due to the effect of water in softening MFC films, resulting in a reduction in strength and increase in flexibility.

WOOD RESEARCH Volume 63, Number 5, 2018
Hamza Cinar

Effects of temperature and thickness of wood based boards on formaldehyde emission

This study investigated the effects of board thicknesses and temperature on formaldehyde emission (FE) for different wood based boards, sampled from standard particleboard (PB) and medium density fiberboard (MDF). Test samples with the thicknesses of 8, 12, and 18 mm analyzed for formaldehyde emission at temperatures of 10, 20, 25, and 30°C and 65% relative moisture conent for 60, 120, and 180 minutes after production. The highest value of FE was found at 1.2922 ppm for PB and 0.3800 ppm for MDF of 18 mm, treated at the temperature of 30°C. The lowest emission was found to be 0.0611 ppm in the PB of 8 mm, and 0.0444 ppm for 18 mm MDF, treated at a temperature of 10°C. A significant increase for FE was detected in all board types at the temperatures of 20, 25, and 30°C. However, a significant decrease was also detected at 10°C for all types of boards. Accordingly, an increase from 101% to 1,192% and a decrease from 39% to 9% was observed for PBs. MDF samples yielded better results as an increase from 4% to 280% and a decrease from 55% to 31%. Regarding distance to E1 (0.10 ppm), all values were above the limits of E1 (≤ 0.10 ppm, EN 717-1), except samples treated at 10°C. In conclusion, the temperature and thickness of wood based boards significantly affect their formaldehyde emissions.