Дослідження фізико-механічних властивостей  деревинностружкових плит із вживаної деревини

Сергій Гайда

doi:10.36930/421137221

Authors

S.V. Gayda Ukrainian National Forestry University https://orcid.org/0000-0001-7468-5661

DOI:

https://doi.org/10.36930/421137221

Keywords:

wood, post-consumer wood, wood particleboard, chips, shreds, fractional composition analysis, phys-ical and mechanical properties of panels, bending strength, tensile strength perpendicular to plane, thickness swelling, eco-economic effect.

Abstract

It is found that post-consumer wood (PCW) is as yet non utilized resource of wood waste that is suitable for manufacturing wood particleboards (WPB). It is found that graded chips from PCW (solid wood) of categories I and II are characterized by a standard fraction content (no less than 80 %) and meet the requirements for chips, PS GOST 15815-83. The shreds from clean: PCW when obtained on the standard equipment similar to that which is used for processing primary raw material do not differ essentially by geometrical configuration, size as well as fraction composition from shreds obtained from conventional wood. The high anisotropy factor of the wood particles gives grounds to expect high strength values for WPB made from PCW.

Investigated was the influence of the PCW and binder contents in each of the layers on physical and mechanical properties of three-layer particleboards: bending strength, tensile strength perpendicular to plane, and thickness swelling. Obtained were adequate mathematical models of dependence of WPB physical and mechanical properties on the PCW contents in each layer and the binder.

Production techniques for PCW-containing three-layer particleboards were developed. It was established that optimal production conditions for standard quality panels (DSTU 10632:2009) should correspond to: for panels of PA type (13 MPa) – PCW content in the core and the face layers of the panels may amount to up to 60 % with the average glue consumption of 11.5 %; for panels of PB type (11.5 MPa) – PCW content may amount to 100 % in the core, and 80 to 100 % in the face layers with glue consumption of 7 to 8 % in the core and 10 to 11 % in the face layers. The resulting effect of using PCW in WPB manufacture was estimated for Swisspan Ltd. enterprise, which lies in the fact that, due to PCW utilization, conventional wood expenditures are reduced by 9.4 %.

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