Screw and Nail Holding Properties of Plywood Panels Reinforced With Glass Fiber Fabric

Abstract

ABSTRACT:In this study, plywood and reinforced plywood with glass fiber fabric were produced with rotary peeled poplar veneers using phenol formaldehyde adhesive. Screw and nail holding tests were conducted to obtain the characteristics of the plywood and reinforced plywood boards. One control group and three different test groups were used. The effects of glass fiber fabric on the screw direct withdrawal, screw-head pull-through, and lateral nail resistance were determined. The results of the tests indicated that the reinforced plywood's resistances to direct withdrawal of the screw, screw-head pullthrough, and lateral nail resistance were significantly higher than those of the unreinforced plywood. In addition, reinforcement of the plywood boards provided longer displacement at maximum load. PROPRIEDADES DE FIXAÇÃO DE PARAFUSOS E PREGOS EM PAINÉIS COMPENSADOS DE MADEIRA REFORÇADOS COM TECIDO DE FIBRA DE VIDRORESUMO: Neste estudo, painéis compensados e painéis compensados reforçados com tecido de fibra de vidro foram produzidos com lâminas do desenrolamento do álamo usando adesivo de fenol-formaldeído. Testes de fixação de parafusos e pregos foram realizados para obter as características dos painéis compensados e painéis compensados reforçados com tecido de fibra de vidro. Os efeitos do tecido de fibra de vidro sobre o arrancamento direto do parafuso, puxado pela sua cabeça, e resistência lateral do prego foram determinados. Os resultados dos testes indicaram que a resistência do painel reforçado ao arrancamento direto do parafuso, puxado pela sua cabeça, e resistência lateral do prego foram significativamente superiores em relação aos valores encontrados para compensados não reforçados. Além disso, o reforço em painéis compensados resultou em maior elongação na carga máxima.

Influence of Adhesive Systems on the Mechanical and Physical Properties of Flax Fiber Reinforced Beech Plywood

“…Furthermore, for laminar wood based composite structures, based on the research of Liu and Guan (2019), the location of fiber reinforcement influences the SWR, suggesting a combination of fiber reinforcement close to the plywood core plies and to the surface plies [36]. This is confirmed by comparing the results of maximum screw withdrawal force F max to Bal et al (2017). This demonstrates that MSWF improved by 13.65% respectively by 14.11%, if fiber reinforcement is located on the surface within the outer glue lines of the five layered (veneer thickness 2.7 mm) PF bonded poplar plywood reinforced with woven glass fiber fabric (areal weight 500 g/m 2 ) [7].…”

“…In addition, density increased whereas thickness swelling and water absorption decreased [6]. Furthermore, screw withdrawal resistance, screw-head pull-through, and lateral nail resistance of glassfiber reinforced phenol-formaldehyde bonded plywood improved significantly aside from increasing maximum load capacity [7]. conducted research on different experimental plies of poplar (Populus euramenicana), eucalyptus (Eucalyptus grandis), poplar/eucalyptus, and carbon fiber reinforced plywood for construction formwork [8].…”

“…Concluding from the studies, epoxy resin is the main source for bonding fiber reinforced wood-based composites with synthetic and natural fibers. Some attempts had been made to use PF, UF, and MUF [6][7][8][9]13,14]. For broader industrial production applications, the use of different adhesives is desirable due to the high production costs of epoxy resin systems.…”

Method for measuring the resistances produced on parallel and perpendicular veneers in plywood under nail embedment loading

“…Jeon and Kong [17] evaluated the embedment behavior of glulam specimens made of Japanese cedar by ash pegs. Bal [18] investigated the characteristics of plywood reinforced with glass fiber fabric. Sawata and Sasaki [19] evaluated the embedment properties of decay-treated solid wood specimen.…”

“…The authors posit that only the resistance produced in plywood should be considered to clarify the influence of the grain direction of plywood. Some studies have conducted embedment tests on plywood specimens [18,26,27], and Kamada [28] showed the experimental data of the two grain directions (i.e., the grain direction of surface veneer was parallel or perpendicular to the load direction) using 3-ply plywood made of larch. According to his data, the higher stiffness was observed when the grain direction of surface veneer was parallel to the loading direction, whereas almost same maximum load was observed in the two.…”