Internal Stress in Sugi Square Timber Dried by the High Temperature Setting Method - Differences between Indoor and Outdoor Storage -

Abstract

The high-temperature setting method, which enables rapid kiln-drying for square timber with pith, has spread in many saw mills in Japan. It has been supposed that obvious drying tension set, which is formed at the shell of timber without back-splitting, results in generation of sufficient compressive stress at the shell, and reducing surface checks significantly. In the paper, we investigated the differences in internal stress between indoor and outdoor storage with sugi (Cryptomeria japonica D. Don) square timber kiln-dried by the method. The compressive stress was expressed as released strain measured by the slicing technique. Main results were shown below.