Influence of log temperature in irregularities on strand geometry detected by digital image analysis
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Universidad del Bío Bío
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Oriented Strand Board (OSB) wood strands, while often idealized as being rectangular and slenderobjects, are in fact typically very complex in shape. This complexity is important to the manufactureand performance of OSB as it influences forming, screening, blending, formation and ultimatelyperformance of the panel. In a mill setting, strand geometry is defined by average length, width andthickness values as determined through simple caliper measurements and/or screen analyses (Gilson).The application of CCD cameras and digital image analysis techniques to rapidly acquire and analyzecomplex strand geometry will allow the processing of large amounts of data, thereby creating thepotential for statistical process control applications. Aspen (Populus grandidentata) strands wereproduced from logs subjected to -6ºC (20F), 21ºC (70F) and 60ºC (140F). Grey scale digital images ofindividual strands were acquired using a CCD camera (1296 x 1016 pixels) under direct lighting. Thecomplexity of strand geometry was characterized by a variety of automated measuring procedures. Asa result of this research the feasibility of applying this methodology to study geometrical distributionsin strands was established. Area, length and width presented changes in their distributions due to theeffect of log temperature. It was found that the irregularity ratio of strands was variable and stronglyinfluenced by log temperature at time of stranding as well as other geometries. Statistical correlationbetween strands irregularity and log temperature was found (p-value<0.001).
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