Introduction The objective of this paper is to further examine the factors which are involved in pit aspiration. During drying of wood, pit membranes are displaced from a central position within the pit chamber until they come into contact with the borders and then effectively seal the apertures. Because this results in a significant reduction of wood permeability, numerous studies have been concerned with pit aspirations (Phillips 1933; Harris 1954; Liese and Bauch 1967; Hart and Thomas 1967; Comstock and Cote 1968). Comstock and Cote (1968) listed three factors, any one or combination of which may control pit aspiration. These were: i. Surface tension forces which exert sufficient force to bring the membrane into contact with the border. 2. Strength of the membrane which results in a force opposing the surface tension forces. 3. Adhesion of the membrane to the pit border when brought into contact. In an earlier study Hart and Thomas (1967) described the mechanism by which capillarity provides a sufficient source of liquid tension to cause the aspiration of bordered pits. They also showed that for a liquid which produces aspiration, the maximum tension which the liquid is capable of producing at any given stage
Holzforschung - International Journal of the Biology, Chemistry, Physics and Technology of Wood – de Gruyter
Published: Jan 1, 1971
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