This research presents the influence of two different cellulose (hydrophobic pretreated/non-pretreated) and one flax-fiber unidirectional nonwoven low areal weight fiber reinforcements on the mechanical properties of urea-formaldehyde bonded five layered beech (Fagus sylvatica L.) plywood as an alternative to commonly used synthetic fiber reinforcements. The results display divergent trends regarding the improvement of the mechanical properties-modulus of elasticity, modulus of rupture, tensile strength, shear strength, and screw withdrawal resistance. The non-treated cellulose and flax reinforcing nonwoven fabrics revealed similar mechanical behaviors. The hydrophobic pretreatment of cellulose nonwovens improved the performance of plywood regarding tensile strength (10-11%), shear strength (7-16%), screw withdrawal resistance (11-15%), and modulus of rupture (0-2%), but lowered modulus of elasticity (2-3%) compared to the reference.

Department for Furniture and Interior Design Higher Technical College Hallstatt Lahnstraße 69 4830 Hallstatt Austria

Department of Wood Science and Technology Mendel University Zemĕdĕlská 3 61300 Brno Czech Republic

Faculty for Furniture Design and Wood Engineering Transilvania University of Brasov B dul Eroilor Nr 29 500036 Brasov Romania

Forest Products Technology and Timber Construction Department Salzburg University of Applied Sciences Markt 136a 5431 Kuchl Austria

Lenzing Aktiengesellschaft Werkstrasse 2 4860 Lenzing Austria

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