Water Effects on Plywood Coated with Wooden Slices on Both Sides

E.A. Pinchevska, D.M. Skliar, I.V. Golovach, N.G. Chausov


Maximum use of raw materials that are classified as waste products in order to guarantee rational use of nature resources is one of the key problems in Ukraine nowadays. Low-grade wood branches are applied in the production of boards' alternatives to chipboards. As wood is porous, it is influenced by different types of moisture. Consequently the aim of study is to determine the degree of moisture effects on plywood coated with wooden slices of different species. The authors choose PVAC adhesive class D3. Birch veneer was used to form the three-layer plywood or five-layer plywood as the bases for wood composite, which was coated on both sides with wood slices of birch (Betula pendula), walnut (Juglans regia) and lime (Tilia europaea). We tested materials on water absorption and swelling in thickness. They are as follows: three-layer plywood faced by walnut wood slices impregnated with glue (Wal Im 3), non-impregnated (Wal Non-Im 3), impregnated birch wood slices (Bir Im 3); five-layer plywood faced by birch wood slices impregnated with glue (Bir Im 5), lime wood slices impregnated with glue (Lin Im 5). The highest degree of water absorption and swelling in thickness was observed in plywood, which was coated with non-impregnated walnut slices. This is due to the presence of voids between the wood cells. Impregnated birch and walnut chips have shown the best results. To conclude, we have determined the degree of water absorption and swelling in thickness of plywood, coated with wood slice of birch, walnut and lime. We have also identified that pre-impregnated of wood chips with glue reduces the effect of liquid water on this wood composite.


plywood; polyvinyl acetate dispersions; wood slices; water absorption; swelling in thickness

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DOI: https://doi.org/10.15421/40270131


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