Xerographic Copies of Stress Sections Can Improve Drying Records

Xerographic reproduction was used to provide permanent records of stress development in drying wood. Images of prong test samples taken during all phases of stress evaluation record the interacting effects of shrinkage or moisture-gradient stress and residual or case-hardening stress, including stress-relief during conditioning. The reproduction method is precise enough to record relative changes in stress level between successive time samples. Thus, essential information needed by the kiln operator to control drying performance and final lumber quality is preserved for reference both during and after drying. In addition, other useful information appearing on the images survives for future reference without the need to save bulky samples. Examples are: 1) measurement of sample board variables that may affect drying rate, such as, growth-ring angle, rings per inch, and earlywood-latewood ratios; and 2) delineation of wet zones, surface checks and honeycomb failures during drying.

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