Determination of Resin Distribution in Flakeboard Using X-Ray Specrometry

X-ray spectrometry was used to determine resin content on individual flakes. This was accomplished by mixing potassium bromide with liquid resin and measuring the bromine content on each flake by x-ray fluorescence scattering. The bromine content was then converted to resin weight by use of prepared standard curve. The method was used to examine resin distribution between flakes blended in both laboratory and industrial blenders. The resin distribution determined by the x-ray method, and defined by median/mean ratio, gives an indication of the ultimate bond strength in boards prepared from such coated wood flakes. A median/mean ratio that is less than unity indicates that the changes in the blender system could be made to improve the between-flake resin distribution. The x-ray technique provides a means of analyzing the effect of between-flake and within-flake resin distributions on internal bond independently.

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