Go to  Advanced Search

Mechanical seed extraction of lodgepole pine

Show full item record

Files in this item

Files Size Format Description   View
UBC_1975_A1 M32_8.pdf 19.66Mb Adobe Portable Document Format   View/Open
Title: Mechanical seed extraction of lodgepole pine
Author: MacAulay, James Donald
Degree: Doctor of Philosophy - PhD
Program: Forestry
Copyright Date: 1975
Issue Date: 2010-02-05
Series/Report no. UBC Retrospective Theses Digitization Project [http://www.library.ubc.ca/archives/retro_theses/]
Abstract: Seed extraction from serotinous lodgepole pine cones (Pinus contorta var. latifolia Englem.) was investigated to identify the physical properties and characteristics which affect seed extraction by both conventional kiln drying techniques and by mechanical means. This information provided a basis for systematic design of specific processing tools for a portable continuous flow mechanical seed extraction system. Cone scale deflection was characterized and its effect on seed release is reported. The effect of moisture content upon scale stress relaxation during storage and subsequent reduction in seed release is discussed. Flash heating of cones in hot water and hot gas was found to effectively release serotinous seals without incurring thermal seed damage. Two continuous flow flash heating seal breaking tools were designed and tested. A flame seal breaker proved most suitable for commercial operation, and this tool was calibrated for use on both young and weathered cones. Mechanical seed extraction by cone core removal was effective, but asymmetrical cones prevented accurate core boring, thus resulting in considerable seed destruction. Seed extraction by threshing also was effective. Testing of first and second generation threshing tools was carried out on lodgepole pine, Douglas fir, white spruce and western hemlock. Further study is recommended to identify the optimum values of the many biological variables, machine variables and operating conditions which affect cone threshing.
Affiliation: Forestry, Faculty of
URI: http://hdl.handle.net/2429/19665
Scholarly Level: Graduate

This item appears in the following Collection(s)

Show full item record

UBC Library
1961 East Mall
Vancouver, B.C.
Canada V6T 1Z1
Tel: 604-822-6375
Fax: 604-822-3893