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• W85539801 abstract "Inherent in the structure of timber are features affecting dimensional stability, stiffness and strength. These include knots, compression wood and spiral grain. Physical characteristics such as log shape, density, rate of growth,presence of juvenile wood and microfibril angle also affect these properties and, in turn, utilisation. In this thesis, the relationships between tree, log and board variables to the properties of stiffness and distortion of British-grownSitka spruce (Picea sitchensis) are examined. The research‟s main aim was to identify variables which could potentially be used to sort timber.Different behaviour in terms of the relationship between stiffness and variables such as density, knot content, log taper, tree height and axial position were noted between groups of upper log and butt log material, and between the four stands and two sites studied. Relationships betweenstiffness and these variables were generally weak, notably for density.Overall, variables based on radial position within the stem were not found to be useful sorting parameters. No relationship between batten stiffness and compression wood content or slope of grain was observed. The relatively lowstiffness of butt wood material was associated with high microfibril angle.Batten twist was found to be a function of spiral grain angle and distance from pith. However, practical difficulties with the use of slope of grain measurements to sort timber were noted. Although severe forms of compression wood were seen to be associated with stem-form correction, relatively straight logs and those which were round, or without pitheccentricity, were also observed to contain compression wood and hence yield timber which distorted on drying.In particular, this work demonstrates the effect of sorting timber using combined variables (e.g. log shape and knot content). These findings may be of use to foresters, sawmillers and developers of timber scanning technologies." @default.
• W85539801 created "2016-06-24" @default.
• W85539801 creator A5046849167 @default.
• W85539801 date "2010-09-01" @default.
• W85539801 modified "2023-09-23" @default.
• W85539801 title "Variables affecting the stiffness and distortion of Sitka spruce." @default.
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• W85539801 hasPublicationYear "2010" @default.
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