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The aim of the research was to investigate the face screw withdrawal resistance of panels produced from fibrous chips of willow Salix Viminalis L. and black locust Robinia Pseudoacacia L. A series of laboratory 3-layer panels were produced from fibrous chips as well as from industrial particles. The results were compared to commercial industrial panel performance. The investigation shows that the panels from black locust have lower screw withdrawal resistance in comparison with the industrial panel. In the case of higher density willow panel the screw withdrawal resistance was better than that of the industrial panel.
Influence of pine wood (Pinus syhestris L.) thermal modification on the withdrawal force of screws. In the study the force required to withdraw the screw from thermally treated pine wood was examined. Modification of pine wood was performed at a temperature range of 150 - 180°C. It was concluded that the process of wood modification does not significantly affect the force needed to pull a screw out, and therefore also the withdrawal capacity and the ability to maintain the screw. In the case of 3.5 x 35 mm and 4.0 x 35 mm screws, the withdrawal capacity constituted respectively 63% and 50% of the ability to maintain the screw.
Effects of manufacturing parameters on mechanical properties of particleboards with the core layer made from willow Salix viminalis. Three-layer experimental particleboards were prepared using the willow Salix viminalis particles for the core layer and industrial pine particles for the face layers. The press temperature (180 and 200°C), press time (4 and 6 min) and shelling ratio (0.3 and 0.4) were variable parameters. The modulus of elasticity (МОЕ), modulus of rupture (MOR), internal bond (IB) and screw holding strength (SHS) of particleboards were investigated. In general, the considered factors significantly affected the mechanical properties of particleboards.
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