Compression and flexural properties of finger jointed mango wood sections

Abstract

In this paper, an attempt was made to assess the effectiveness of finger jointing in utilising mango wood sections for various end uses like furniture. The study was based on the estimation of Modulus of elasticity and Modulus of rupture under static bending and Maximum Crushing Stress and Modulus of elasticity under compression parallel to grain of finger jointed sections and comparing them with the values measured for clear wood sections from the same lot. For joining the sections, the Poly Vinyl Acetate and Urea Formaldehyde adhesives were used. It was found that the Modulus of elasticity of the sections joined by either adhesive showed significantly better values than that of unjointed clear wood sections. The Modulus of rupture values of sections joined with Urea Formaldehyde were similar to those of unjointed clear wood sections. However, sections jointed with Poly Vinyl Acetate adhesive exhibited lower Modulus of rupture. Under compression, the parameters of the jointed sections joined with either adhesive were either similar or better than those of the unjointed clear wood sections. The study demonstrates the utility of finger jointing of mango wood sections for furniture parts especially with the Urea Formaldehyde adhesive.

From residue to structurally and economically valuable lumber: Assessment of density, flexural properties, and joint efficiencies of finger-jointed logging residues of Khaya Ivorensis

“…Barboutis and Vassiliou (2008) reported MORs of 62-76% upon using 4 different nger pro les and different PVA types for Castanea sativa wood, whereas Kumar et al (2011) obtained MOR of less than 30% for mango wood using PVA adhesive. These appear to corroborate with the conclusion of Frihart (2005) and corroborated by Kumar et al (2015) that rupture and elasticity properties of FJ lumber is less dependent on adhesive used.…”

“…This could mean that, joining stem and branch timber of K. ivorensis could produce better elastic FJ lumber. The trend of increased in exural elasticity of FJ lumber (as exhibited by the group tested at 18 ± 3%mc) is consistent with ndings of Kumar et al (2015) who reported 114.1% with PVA adhesive for FJ mango stemwood and indicated its agreement with Kumar et al (2011) using same adhesive but varied nger pro les. On the other hand, the relatively low MOEs of the sample group tested at 9 ± 3mc also appears to be consistent with Ayarkwa et al (2000) who reported MOEs of FJ lumber of Ghanaian hardwood to be between 83 to 98% of those of unjointed timber upon using resorcinol-formaldehyde adhesive.…”

Research Concerning the Bending Properties of Reconstituted Spruce Lumber Boards, Obtained by Edge-Cutting at 45° and Gluing

“…Both the type of the joint (angle and shape under which the cutting is performed) and the glue type influence the material density, elasticity, and strength. Testing wood joints in bending was previously done and reported in literature, e.g., [11][12][13], but no reference regarding the bending behavior of edge-joints at 45 • was found in the literature.…”

Production of blockboard from small athel slats end-glued by different type of joint

“…Effectiveness of finger jointing in utilizing mango wood sections for various end uses like furniture was evaluated (Kumar et al 2015). It was found that the modulus of elasticity of the sections joined showed significantly better values than that of unjointed clear wood sections.…”