Evaluation of the effect of the component ratio on the properties of a chipboard

The paper presents the results of studies of the physico-mechanical properties of a chipboard without the use of binders for various component ratios. Shavings obtained from plywood production waste (veneer flaps, pencils) with a moisture content of more than 100 % were used as a reinforcing component, and hydroactivated measles based on Pinus Sylvestris pine bark was used as a matrix. The ratio of bark/chip components by absolutely dry substance, wt. %, amounted to: 70/30; 60/40; 50/50; 40/60; 30/70. The introduction of chips in the amount of less than 40 percent of the mass into the composition of the plywood material leads to a decrease in the strength of the chipboard when bending, the introduction of chips in the amount of more than 60 percent into the sheet material leads to a decrease in the tensile strength perpendicular to the surface of the chipboard and an increase in the thickness of the swelling index. Physicomechanical parameters of chipboards with a thickness of 16 mm with a 50/50 % weight ratio of components (bark/chips). meeting the requirements of the standard for particle boards used in dry conditions are as follows: density is 750 kg/m3 , bending strength is 18.4 MPa, tensile strength perpendicular to a chipboard`s surface is 0.37 MPa. The produced boards can be used as an alternative to traditional particle boards based on formaldehyde resins in housing construction, building and furniture production.

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