Compression and flexural properties of finger jointed mango wood sections

V.S Kishan Kumar,Sachin Gupta,C.M Sharma

doi:10.4067/s0718-221x2015005000015

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.

Highlights

End jointing of lumber to permit the use of single-piece construction has posed a challenge to wood product manufacturers
This paper reports the results of a study on the static bending and compression parallel to grain parameters was conducted on finger jointed sections of mango wood joined using Poly Vinyl Acetate (PVA) and Urea Formaldehyde (UF) adhesives
In Silver Oak, Rubber wood and Eucalyptus species, the efficiency of UF glued finger jointed sections were reported to be in the 60-65 % of the Modulus of Rupture (MOR) values of their respective clear sections (Uday et al 2007) whereas in the present study it is similar to unjointed sections

Summary

INTRODUCTION

End jointing of lumber to permit the use of single-piece construction has posed a challenge to wood product manufacturers. Apart from the glueability of the wood used, the parameters of the finger profile and the adhesive used play important roles in providing strength to the joint. Most individual sections of everyday furniture usually are required to withstand bending and compression stresses. Irrespective of the efficiency of a jointed section with reference to a corresponding clear wood section, it usually is the individual bending and compression load bearing capacities that matter in putting the jointed sections into use. The small and medium scale furniture industry usually resorts to less-expensive adhesives for its joinery work. This paper reports the results of a study on the static bending and compression parallel to grain parameters was conducted on finger jointed sections of mango wood joined using Poly Vinyl Acetate (PVA) and Urea Formaldehyde (UF) adhesives

MATERIALS AND METHODS

RESULTS AND DISCUSSION

CONCLUSIONS