Studies on Hardwood Resin (III)

Abstract

Little difference exists on the resin contents and its chemical compositions of three lauan wood species. Most of the data on pulp resin so far has been obtained by the standard resin analysis experiments and supports the deresination process suggested by the present authors in the previous report.The importance to pitch formation of a better understanding of the natural components of resin is emphasized, with examples showing the influence on this components of pulping and bleaching processes and the dependence on its composition of cooking conditions.The use of some thin layer chromatographic techniques developed for plant chemistry, have provided great availabilities in detection of pulp pitch components.Experimental techniques (ultraviolet light radiation method) which can be used to study pitch troubles for printability of paper are discussed in terms of simplicity of the process and reproducibility of the results. It is pointed out that the technique will determine whether or not resin particles of pulp form pitch fleck on pulp sheet.