WOOD RESEARCH Volume 65, Number 1, 2020
Petar Antov, Viktor Savov, and Nikolay Neykov

Sustainable bio-based adhesives for eco-friendly wood composites. A review

The aim of the present review is to summarize the current state of research in the field of sustainable bio-based adhesives used for production of eco-friendly wood composite materials. The article is focused mainly on the use of lignin, starch and tannins as raw materials and alternatives to the existing conventional adhesives. It is expected that increased amounts of bio-based adhesives will be used in the production of wood composites in order to meet the current needs for development of sustainable and innovative materials which will make the wood-based panel industry more sustainable and lower its dependence on fossil fuels. However, there are still substantial challenges for the complete replacement of petroleum-based wood adhesives with bio-based adhesives, mainly because of their relatively poor water resistance, low bonding strength and large natural variations due to different growing conditions. In this respect, fundamental research is still need in order to determine the factors for formulating bio-based adhesives with optimal properties and broaden their application in wood-based panel industry.

WOOD RESEARCH Volume 64, Number 3, 2019
Sergiy Kulman, Liudmyla Boiko, Diana Hamáry Gurová, and Ján Sedliačik

Prediction the fatigue life of wood-based panels

This work presents the results of an experimental investigation of the vibration response of cyclically loaded wood-based panels. The maximum temperature of the stationary state of the activation zone of samples of wood-based panels in the form of a rigid cantilever with their cyclic load at loading frequencies from 0 to 50 Hz and maximum internal stresses from 0.98 to 5.36 MPa was investigated. The purpose of this study is to determine the temperature of selfheating and to determine the dependence of the temperature on the loading conditions. The mathematical model is proposed in the form of system nonlinear ordinary differential equations, where stress, strain and temperature were used as the essential variables. The behaviour of the system is completely determined by the ratio of the introduced external energy and the value of the order parameter. The critical value of the order parameter depends on the thermo-physical properties of the material and is equal to the ratio of the value of the heat transfer coefficient multiplied by the area of thermal dispersion to the coefficient of linear thermal expansion.