Properties of Sandwich-Type Particleboard Panels Made from Rubberwood and Eastern Redcedar

Abstract

The objective of this study was to determine some of the mechanical properties of sandwich-type particleboard manufactured from rubberwood (Hevea brasilenesis) and Eastern redcedar (Juniperus virginiana). A total of 36 panels with two density levels of 0.65 and 0.75 g/cm3 were made using 10 percent urea-formaldehyde, a combination of 3 percent urea-formaldehyde and 10 percent cassava starch, and 10 percent cassava starch, respectively, as a binder. Three-layer panels with rubberwood fibers on the face layers and a mixture of 10 percent Eastern redcedar and 90 percent rubberwood particles in the core layer of the panels were manufactured. The highest modulus of elasticity, modulus of rupture, and internal bond strength values of 2,990, 34.72, and 1.09 MPa, respectively, were found for those panels made with 10 percent urea-formaldehyde having a density of 0.75 g/cm3. Panels made with 10 percent starch did not have satisfactory mechanical properties and dimensional stability according to Japanese Industrial Standards. However, it seems that a mixture of a low percentage of urea-formaldehyde resin with cassava starch would be a viable alternative binder to manufacture particleboard with acceptable mechanical properties and enhanced surface quality.

Screw and nail withdrawal strength and water soak properties of wet-formed cellulose nanofibrils bonded particleboard

“…There were no significant interaction effects on either the nail pull or face screw withdrawal strength. Panel density had the most important effect on the nail and face screw withdrawal strength, which agreed with previous studies (Cai et al 2004;Vassiliou and Barboutis 2005;Wang et al 2007). Figures 3 and 4 show positive trends of the nail and face screw withdrawal strength as density increased.…”

“…Density plays an important role in the screw holding strength (Alma et al 2005). A previous study showed that there was a near-linear increase in face screw withdrawal strength as the density of the particleboard increased (Cai et al 2004;Vassiliou and Barboutis 2005;Wang et al 2007). In addition, the vertical and horizontal density profile influenced the screw withdrawal strength (Guler et al 2006;Wang et al 2007).…”

“…In general, low-density panels have higher WA due to larger cavities within the panels (Alma et al 2005;Nemli and Demirel 2007). It has been reported that the TS increased with the increasing panel density (Cai et al 2004;Buyuksari et al 2010). A higher density indicated more material per unit volume and higher compaction ratio of materials, thus causing higher spring-back after absorbing water (Paridah et al 2010).…”

“…The nail and screw holding capacity are then of importance in furniture and building construction industries. The design and structure stability of a product are dependent on the nail and screw withdrawal resistance (Wu 1999), of which the face screw withdrawal resistance is commonly used to determine the fastening quality of wood composites (Cai et al 2004). Density plays an important role in the screw holding strength (Alma et al 2005).…”

Low Density Wood-Based Particleboards Bonded with Foamable Sour Cassava Starch: Preliminary Studies

“…Some authors studied the production of biodegradable foam trays based on cassava starch blended with chitosan and Kraft fiber [ 20 ] or with sunflower protein and cellulose fiber [ 21 ]. Cassava starch, in combination with a small percentage of urea-formaldehyde resin, has been used as a binder in wood-based particleboards with densities of 650 and 750 kg/m 3 [ 22 ].…”