Effect of a Metal-strap Thicknesses on the Bending Process

  • Jung, In-Suk (Department Group of Forestry and Wood Sci. &Tech., College of Agriculture, Kyungpook National University) ;
  • Kim, Jung-Whan (Department Group of Forestry and Wood Sci. &Tech., College of Agriculture, Kyungpook National University) ;
  • Lee, Weon-Hee (Department Group of Forestry and Wood Sci. &Tech., College of Agriculture, Kyungpook National University) ;
  • Chang, Jun-Pok (Division of Life Resource Science, Joongbu University) ;
  • Bae, Hyun-Mi (Division of Architecture & Landscape Architecture, Mokpo National University)
  • Received : 2001.06.04
  • Accepted : 2001.08.24
  • Published : 2001.09.30

Abstract

On the bending process, metal-strap plays an important role in dispersing the stress generated in wood. Therefore, the metal-strap has more influence on the property of bentwood materials. The effect of the metal-strap thickness for bentwood was examined. The effect of metal-strap on the bending properties of Korean red pine(Pinus densiflora Sieb. et Zucc.)was investigated in this research. The metal-strap thickness is divided into 4 kinds such as 1.0, 0.8, 0.6, 0.4 mm. The specimens were selected by grain such as annual ring angles, flat grain and half-edge grain specimens. As a result of this study, the bending ability of 1.0, 0.8 mm, thickness of half-edge grain specimens was better than flat grain specimens but the result of 0.6, 0.4 mm were reversed. The bending ability of half-edge grain was better than flat grain and the grade was higher. When the processed specimens were dried, the radius of curvature(ROC) was decreased became drying-stress was not perfectly dispersed. An optimum drying-condition would deminish this phenomenon.

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