Dynamic Modulus of Three-Layer Boards with Different Furnish and Shelling Ratio

Abstract

This aims of this study were to investigate the relationship between non-destructive evaluation (NDE) and actual bending properties of particleboard, and to predict the bending properties of three-layer particleboard. Three kinds of raw materials, i.e. Hinoki (Chamaecyparis obtusa Endl.) strand, knife-milled Douglas-fir (Pseudotsuga manziesii (Mirb) Franco), and hammer-milled matoa (Pometia spp.) obtained from wooden industry, were utilized as furnish for experimental panel with methylene diphenyl diisocyanate (MDI) resin as binder. The NDE test was conducted by hit sounds using an FFT analyzer according to the spectrum peak of wave frequency, while the static bending test was conducted according to JIS A-5908. The results reveal that the dynamic Young's modulus as an NDE test has a potential for being used to predict the elastic bending of particleboards by a specific equation for adjusting its proper values. The values of NDE and static test are significantly different with a deviation range at 3-20%. The bending stiffness of three-layer particleboards manufactured from different wood species is predictable by observing the bending stiffness of two elements based on the thickness of its layers. The predicted values of bending stiffness and static test are significantly different with a deviation range at 5-24%.

Selected Properties of Particleboard Made from Sugar Palm (Arenga pinnata) Dregs

“…Small/fine particles produce higher internal bonding strength, but lower static bending strength than coarse particles (Hwang and Oh, 2021;Karlinasari et al, 2021;Widyorini et al, 2016b). The application of materials with a high lengthto-thickness ratio (slenderness ratio) improves the bending properties compared with shorter and thicker materials (Iswanto et al, 2020;Kwon et al, 2013;Rofii et al, 2013Rofii et al, , 2016. Hwang and Oh (2020b) High-quality particleboard properties can be achieved by mixing particles of different shapes and sizes under optimal conditions.…”

Variation in Tree Growth Characteristics, Pilodyn Penetration, and Stress-wave Velocity in 65 Families of Acacia mangium Trees Planted in Indonesia

“…Non-destruction and semi-destructive techniques for evaluating wood properties are capable of decreasing cost, energy, and time, and these are applied in solid and non-solid wood products (Jeong et al, 2016;Rofii et al, 2016;Hidayat et al, 2017). Moreover, Pilodyn was introduced as a non-destructive assessment method for density within the breeding program (Sprague, 1983;Woods et al, 1995;Hansen, 2000), as its penetration confers a significantly negative correlation (Taylor, 1981;Wei and Borralho, 1997;Wu et al, 2010;2011b).…”