Chemical Pulps and Writing and Printing Papers from Chir (Pinus longifolia Roxb.)

Laboratory experiments on the sulphate pulping of chir (Pinus longifolia) are described. One pilot plant experiment is also described. The average fibre length of the pulp was 3.60 mm. and the average fibre diameter was 0.052 mm. Easy bleaching pulps in good yields were obtained. Printing paper made on the pilot plant was characterized by good formation and satisfactory strength properties. A sample of printing paper is appended to this bulletin.