The mechano-sorptive behavior of poplar during high-temperature drying

In this study the mechano-sorptive creep perpendicular to the grain was dem onstrated by an experimental technique based on the analysis of strain of 3 0mm thick fast-growing poplar lumber. Four levels of drying temperatures (8 5 degrees C, 105 degrees C, 115 degrees C and 125 degrees C) were used to d ry the wood. The overall board shrinkage and the immediately released and s et strains were measured as a function of time. The total strain that occur s in lumber drying is the sum of four components: elastic strain, shrinkage strain, visco-elastic creep strain and mechano-sorptive creep strain. The elastic and visco-elastic components of creep are small and produced immedi ately after the creation of stress. Mechanosorptive creep is the major stra in that causes caseharderning during drying.