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Feasibility studies on finger jointing of plywood sections

Author Affiliations

  • 1Forest Products Division, Forest research Institute, Dehradun, 248006, India
  • 2Forest Products Division, Forest research Institute, Dehradun, 248006, India
  • 3Forest Products Division, Forest research Institute, Dehradun, 248006, India
  • 4Forest Products Division, Forest research Institute, Dehradun, 248006, India
  • 5Forest Products Division, Forest research Institute, Dehradun, 248006, India
  • 6Forest Products Division, Forest research Institute, Dehradun, 248006, India

Res. J. Agriculture & Forestry Sci., Volume 8, Issue (2), Pages 21-26, April,8 (2020)

Abstract

This study explores the feasibility of end joining short pieces of commercial plywood through finger joints. The joints were glued with urea formaldehyde and poly vinyl acetate (PVAc) adhesives. It was observed that both the adhesives resulted in similar bending strengths of around 25N/mm2 showing no glue effect. This was attributed to the absence of glue penetration into individual veneers which already had exposure to enough adhesives during manufacture of the plywood. The bending strength efficiency was in the 53%-61% range depending on the direction of face veneers. All jointed samples resulted in very high MoE efficiencies in the range of 84% to 97% as is seen in solid woods usually. The actual values ranged between 4440 N/mm2 and 6240 N/mm2 in two directions. Overall, the study demonstrated the potential of using finger joints for saving plywood offcuts that are wasted by the furniture manufacture industry to make longer sections with more than half of bending strength and very high elasticity compared to original unjointed plywood.

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