Vidholdová, Zuzana, 1975- Bonding of the thermally modified norway spruce wood with the PUR and PVAc adhesives / Zuzana Vidholdová, Dávid Ciglian, Ladislav Reinprecht. -- Obr., tab. -- Lit. - The quality of the bonded joints in wood structures and furniture products is influenced by the surface characteristics of wood and the physical-chemical characteristics of adhesive. In this study the polyurethane (PUR) and polyvinyl acetate (PVAc) adhesives were used for bonding the Norway spruce (Picea abies /L./ Karst.) wood which was firstly dried at 100 °C and subsequently thermally modified for four hours at the temperatures of 160 °C, 180 °C, 200 °C, and 220 °C. The shear strength of the lap joints in bonded wood specimens, determined in accordance with the standard EN 205:2016, was analysed in relation to (a) the type of adhesive, (b) the temperature at thermal modification of wood, and (c) the composition of the bonded wood specimen formed from two slabs which were prepared from unmodified, unmodified and thermally modified, and thermally modified timbers, respectively. The shear strength of the lap joints was lower (a) at using the PVAc adhesive compared to PUR adhesive, (b) at using the wood slabs prepared from timber thermally modified at higher temperatures from 160 °C to 220 °C, and (c) for the specimens formed from slabs both thermally modified. In comparison to the reference specimens, there the highest decrease in the shear strength – by 42.3%, from 9.3 MPa at using PVAc adhesive, or by 56.1%, from 11.2 MPa at using PUR adhesive – was found for specimens formed from two slabs thermally modified both at 220 °C. Only at the highest modification temperatures, a cohesive type of failure occurred directly in the wood adherent.

In Acta Facultatis Xylologiae Zvolen : vedecký časopis Drevárskej fakulty. -- Zvolen : Technická univerzita vo Zvolene, 2021. -- ISSN 1336-3824. -- Vol. 63, no. 1 (2021), s. 63-73

I. Ciglian, Dávid, 1995-
II. Reinprecht, Ladislav, 1953-
III. Acta Facultatis Xylologiae Zvolen : vedecký časopis Drevárskej fakulty. -- Vol. 63, no. 1 (2021), s. 63-73

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