Тhe influence and distribution of powdered hydrolytic lignin in wood filler on the operational and aesthetic characteristics of binderless plastic

His study explored compositions of powdered hydrolysis lignin and wood fillers (pine and birch sawdust) made in various proportions. The studied compositions were proposed for use in the production of binderless plastic. The influence of hydrolysis lignin content on the operational and aesthetic properties of the resulting plastic was revealed when it was distributed within the wood filler followed by piezothermal treatment. Rational compositions of the pre-densified raw materials were determined to achieve the desired balance of performance indicators such as bending strength and water absorption during 24 hours. Aesthetic evaluation of the materials was performed using scanned images and analysis of obtained color models. The analysis of color and binary images of top surface and internal longitudinal cross-sections of samples made of various compositions revealed challenges in achieving complete differentiation of powdered hydrolysis lignin within the wood filler. Such circumstances of mechanical distribution of the coloring agent in the composition prevent the attainment of monochrome colored products. This non-uniform distribution throughout the product volume also impacts the operational properties of the resulting plastic.