Read PDF Adhesives: Mechanical Properties, Technologies and Economic Importance

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Technological Advances and How Structural Adhesives Support Manufacturing

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Grab adhesive test using 316 stainless steel

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As shown in the table, shrinkage along the tangential dimension is more than that along the radial dimension which is also much more than the longitudinal shrinkage. This observation is similar to that reported by Erakhrumen and Ogunsanwo and Gutu They noted that shrinkage is highest in the tangential direction. Liese and Malanit et al.

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Adhesive Technologies

From this study, it is also clear that radial shrinkage is lower than tangential shrinkage. This is in contrast with the conclusions made by Anokye et al.

There was no significant difference among the mean volumetric shrinkages of the Glulam boards as shown in the Table 1. The initial increase in this strength property can be attributed to better bonding of the laminate members as a result of the addition of more glue. This view was echoed by Malanit et al. The individual laminate members constituting this sample may have more vessels and fewer fibres, thereby absorbing much of the adhesive and starving the glue joint line.

This will in turn prevent the laminate members from binding well and as such, they can be easily disengaged after applying a sudden load to them Ogunsanwo et al. Alternatively, it could also be that deep penetration of glue into the cells at the interface created more adhesion between the bamboo laminate and the forces needed to produce failure along the interface was so high that failure occurred within the bamboo cells rather than occurring along the glue line Ogunsanwo et al. Statistical analysis revealed that glue quantity had a significant effect on the impact strength of the Glulam as shown in Table 2.

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This increase in strength property can be simply attributed to the increase in the bonding strength within the Glulam due to deeper penetration of the adhesive into the laminate members. However, despite the increase in the MOE value as glue quantity increased, statistical analysis showed that there was no significant difference in the means of the samples tested as shown in Table 2.

1. Introduction

This can be attributed to the increase in the bonding strength consequent of the increasing glue quantity as earlier observed. This is different from the values recorded by Ogunsanwo et al. It is however similar to the value reported by Anokye et al. An increasing trend was observed with increasing glue quantity. This may be as a result of the increase in glue quantity which resulted into a higher bonding strength within the Glulam boards.

Bamboo is a fast growing, readily available, cheap alternative raw material to wood. Investigating the optimum quantity of adhesive required to produce bamboo laminate boards with good technical properties became imperative in order to minimize the cost of production, maximize profit and ensure its affordability by end users. At the end of this study, the following conclusions were made:.

Glue quantity had no significant effect on the physical properties of bamboo Glulam. Significant differences were observed for some of the mechanical properties investigated such as for impact bending strength and the modulus of rupture. Grandis and S. This reaffirms the fact that bamboo is a good alternative wood material. Based on the findings from this study, the following recommendations are essential: Variation along and across bamboo culms is inevitable; all of which affects the gluability of bamboos in laminate production.

It is therefore recommended that further research be conducted to investigate the effect of adhesive quantity, axial and radial sampling positions on the physico-mechanical properties of bamboo. Further studies should be carried out on the effect of other types of adhesive such as the natural adhesives on bamboo Glulam technical properties as the natural adhesives are more environmental friendly and will be cheaper than their synthetic counterparts.

Razak, O. Shoot production and culm growth of two commercial bamboo species in Peninsular Malaysia. Bamboo Inform Centre India Bulletin 2 1 : Anokye, R.

How to Choose the Right Adhesive for Your Application - Henkel Adhesive Technologies Blog

Variations in moisture content affect the shrinkage of Gigantochloa scortechinii and Bambusa vulgaris at different heights of the bamboo culm. Bioresources 9 4 : Bamboo Properties and Suitability as a Replacement for Wood. Pertanika Journal of Scholarly Research Reviews 2 1 : Anwar, U. Latif, M. Effect of outdoor exposure on some properties of resin-treated plybamboo. Industrial Crops and Products 33 1 : Effect of curing time on physical and mechanical properties of phenolic-treated bamboo strips.

Industrial Crops and Products 29 1 : Chaowana, P.