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Title: Radial permeability of timber
Author: McQuire, Athol John
Awarding Body: University of Leeds
Current Institution: University of Leeds
Date of Award: 1970
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A procedure is described for monitoring the uptake of liquids under pressure, into small blocks of dry wood, Tests with eight softwood species showed that rates of uptake in the radial direction correlated well with the known treatability of these species in relation to commercial pressure impregnation with wood preservatives. Several different patterns of radial penetration were observed and it was found that the most important morphological feature influencing these was the nature and condition of the ray parenchyma cells, the crossfield pits in particular, Examination of the structure of water-stored spruce showed that the bordered pit membranes and tori had been destroyed, probably by bacteria. It is suggested however, that the main factor causing increased permeability in this material was the partial destruction of some of the crossfield pit membranes. The possibility of developing biological pre-treatment for the preservation of poles of refractory species is discussed.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available