STUDY ON IMPROVING DRYING QUALITY OF SMALL-DIAMETER LUMBERS WITH INTERMITTENT-HEATING METHOD

作     者：Guo Minghui, Zhao Xiping, Yang Haili Material Science and Engineering College, Northeast Forestry University, Harbin 150040, China 

会议日期：2006年

学科分类：082902[工学-木材科学与技术] 08[工学] 0829[工学-林业工程] 

基　　金：This research was supported by Huo Yingdong funds (81022) the Program of Heilongjiang Province(GB02B603) 

关 键 词：Small-diameter timber Birch lumber Consecution-heats Intermittent-heating Drying quality 

摘      要：正Heating methods affect the drying quality of lumbers. In this study, the small-diameter Birch lumbers were dried with consecution-heats or intermittent-heating, visual drying defects （bow, crook, twist, check along grain and end check） were measured before drying and after drying, and then statistical analysis were performed. It was found that the drying quality of small-diameter Birch lumbers could be improved with intermittent-heating, but the intermittent time should be prolonged. Prolonging intermittent time helped to weaken or even avoid wood distortion and drying checks. It wasn’t helpful in avoiding crook. The drying quality of small-diameter Birch lumbers with all kinds of drying methods reached the second class of the Chinese National Standard. The drying quality reached the first class of the Chinese National Standard with the intermittent-heating in the area of visual wood defects.