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Permeability of a mountain-type Douglas fir stem containing included sapwood bands Koran, Zoltan

Abstract

Permeability to creosote of sapwood, included sapwood, and normal heartwood of a mountain-type Douglas fir stem was correlated with specific gravity, growth rate, percent summerwood, tracheid length, number of longitudinal resin ducts, alcohol-benzene, acetone and ether-soluble extractive contents of the corresponding zones. The effect of pressure and temperature on creosote retention was tested on creosote retention in true sapwood, included sapwood (abnormal heartwood), and normal heartwood. Test specimens were extracted in different solvents and ease of penetration tested by creosote impregnation. Among the factors investigated in the present study, specific gravity, tracheid length, growth rate, and number of longitudinal resin ducts did not have a measurable influence on creosote retention. Percent summerwood did not vary significantly at the five positions tested. Pressure had the greatest effect on creosote retention at 212°F. for heartwood, less for included sapwood and least for sapwood. The influence of temperature on creosote retention in Douglas fir heartwood was greater at 100 psi pressure than at atmospheric pressure. The effect of alcohol-benzene and acetone-soluble extractives on wood permeability was not proven statistically significant. A visual hyperbolic relationship was obtained between ether-soluble extractives and wood permeability. The higher the extractive content, the greater the retention. Pre-treatment of samples with different solvents, in order to remove some of the extractives, improved the permeability of heartwood and included sapwood significantly but caused only a slight improvement in sapwood.

Item Metadata

Title
Permeability of a mountain-type Douglas fir stem containing included sapwood bands
Creator
Koran, Zoltan
Publisher
University of British Columbia
Date Issued
1961
Description
Permeability to creosote of sapwood, included sapwood, and normal heartwood of a mountain-type Douglas fir stem was correlated with specific gravity, growth rate, percent summerwood, tracheid length, number of longitudinal resin ducts, alcohol-benzene, acetone and ether-soluble extractive contents of the corresponding zones. The effect of pressure and temperature on creosote retention was tested on creosote retention in true sapwood, included sapwood (abnormal heartwood), and normal heartwood. Test specimens were extracted in different solvents and ease of penetration tested by creosote impregnation. Among the factors investigated in the present study, specific gravity, tracheid length, growth rate, and number of longitudinal resin ducts did not have a measurable influence on creosote retention. Percent summerwood did not vary significantly at the five positions tested. Pressure had the greatest effect on creosote retention at 212°F. for heartwood, less for included sapwood and least for sapwood. The influence of temperature on creosote retention in Douglas fir heartwood was greater at 100 psi pressure than at atmospheric pressure. The effect of alcohol-benzene and acetone-soluble extractives on wood permeability was not proven statistically significant. A visual hyperbolic relationship was obtained between ether-soluble extractives and wood permeability. The higher the extractive content, the greater the retention. Pre-treatment of samples with different solvents, in order to remove some of the extractives, improved the permeability of heartwood and included sapwood significantly but caused only a slight improvement in sapwood.
Genre
Thesis/Dissertation
Type
Text
Language
eng
Date Available
2012-01-06
Provider
Vancouver : University of British Columbia Library
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
DOI
10.14288/1.0075429
URI
http://hdl.handle.net/2429/39907
Degree
Master of Forestry - MF
Program
Forestry
Affiliation
Forestry, Faculty of
Degree Grantor
University of British Columbia
Campus
UBCV
Scholarly Level
Graduate
Aggregated Source Repository
DSpace

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For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.