Setting density value for quality control in the board moisture content measurement by the radio-frequency type equipment
2018
Tomita, M. (Gifu Prefectural Research Institute for Forests (Japan)) | Dohi, M.
Measurement of moisture content by ratio-frequency type equipment affects individual wood density. In this research we propose to set the density setting dial to 10% of the lower limit of density, not average density, when measuring for quality control. First of all, we prepared a relation diagram of measured values by the oven dried moisture content and individual density setting. And a calibration curve between them was obtained. Next, we corrected the measured values set with the 10% lower limit of the density with this calibration curve. According to the proposed measurement results, it is shown that the 1 : 1 line and the lower line of 80% confidence interval are almost the same in the relationship between the oven dried moisture content and the corrected measured value. Consequently, setting the concentration setting dial to the lower limit value of the concentration means that it is a technique suitable for measurement aimed at quality control.
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