The effect of the fine fraction on the basic properties of the press mass and slab material without binders from the bark of Pinus sylvestris

The paper presents the results of studies devoted to the study of the effect of the fine fraction of the crushed measles press mass on the physical and mechanical properties of plates without the use of binders. The crushing of Pinus sylvestris tree bark is carried out by its mechanical activation in a hydrodynamic dispersant, which ensures the production of a finely ground press mass. The analysis of scientific sources indicates that the fine fraction has a high specific surface area, has the ability to embed itself between larger particles of mass and act as a binding component in the composition of plates obtained without the use of binders. The influence of the fine fraction on the properties of the plates was assessed using the WRV water retention index. According to the conducted studies, the water-holding capacity of the measles press mass and the strength properties of the plates largely depend on the presence of fine particles in its composition. The degree of influence of the fine fraction was assessed by repeatedly rinsing the measles press mass with water at a ratio of weight and added water 1:15; 1:30; 1:45. When determining the properties of manufactured plates, it was found that with an increase in the proportion of water during washing, the properties of the plates deteriorate: the tensile strength perpendicular to the formation decreases by 0.59 MPa, the strength under static bending – by 13.2 MPa, the swelling in thickness increases by 18%. Thus, a decrease in the number of fine particles has a negative effect on the basic physical and mechanical properties of the plates. It has been experimentally confirmed that the fine fraction provides a high degree of contact of the crushed particles with each other, contributing to the formation of an integral plate frame.

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