Drying Characteristics of Betula costata Disk Pretreated with PEG400
In order to expand the application extent of the woods with low quality,and to promote their economic values,one of the effective ways is to process them into disk-shaped timber (DST).However,DST is easy to be cracked during drying.To solve the problem,a solution called PEG400 was applied for the pretreatment before making the Betula costata DST.The influences of the pretreatment on the drying characteristics of B.costata DST were examined.The mechanism of preventing the occurrence of the cracking was discussed.The results showed that drying quality of pretreated DST with a thickness of 40 mm was satisfactory.The adaptability for the drying conditions was promoted after the pretreatment.The pretreatment significantly affected radial moisture content gradient.To diminish D-value of shrinkage coefficient between radial and tangential direction was the major function of restraining cracking by PEG400.
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