Knowledge on the oleophilic, resinous, extractives of wood with their relevance to pulping, paper making and paper properties is summarized.
The main physical and chemical features of the two types of wood resin – the one in resin canals and the one in parenchymatous cells, mainly within the rays – are reviewed in respect to the above mentioned theme. These features are also analyzed with special reference to alkaline deresination and pitch problems.
Difficulties in washing out resin after kraft pulping due to the effects of ionic strength and Ca-ions are discussed as well as deresination in bleaching operations.
Present pitch problems in paper making and control measures are reviewed. Effects of wood resin on paper properties e.g. deposits in laser printers and smell or taste in board for liquid containers are discussed.