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Soft x-ray and microdensitometer method (pheto-densitometric method) was applied to the determination of particleboard density. Firstly, the accuracy of this method was examined comparing with gravime...tric method, and then, commercial and laboratory made particleboards were tested for the density distribution throughout the thickness. The results obtained are as follows: (1) The contrast of the photographic film exposed by soft x-ray is translated into density chart by a microdensitometer, and the density of test sample is evaluated by the height of curve in the chart (H). The calibration curve of H in relation to the gravimetric density of wood is presented in Fig.1. (2) As shown in Fig. 1, the values of H of cured phenol resin and cured urea resin are almost equal to those of wood which have the same density to these resin. This fact indicates that the resin contained in particleboard will has no special effect on photo-densitometric evaluation of the board. (3) The density values and the density profils throughout the board thickness obtained by photo-densitometric method agree with the results by gravimetric method within the experimental errors (Table. 2 and Fig. 2,3) (4) Some examples of the density profiles obtained by photo-densitometric method are presented in Fig. 4.続きを見る
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Mendeley出力
KJ00005470574