Research Branch

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Production of Higher-Value Treatable SPF Lumber

Author(s) or contact(s): P.I. Morris, F. Lam, and J.F. Mckay
Source: Research Branch
Subject: Forest Industry and Products
Series: FRDA Report
Other details:  Published 1990. Hardcopy is available.


Forintek has developed process technology to overcome the relatively low permeability of many Canadian wood species.
This report describes the results of experiments performed on western spruce-pine-fir (SPF) using the commercial prototype of a novel incisor. The machine, developed by Forintek Canada Corp. and built by B.C. Cleanwood Preservers Ltd., uses synchronized pairs of incising rollers to lay down two superimposed patterns of incisions at a density of almost 12,000 incisions per square meter (double-density incising). It has 12 mm long thin sharp teeth which, when the lumber is incised green, separate rather than cut the wood fibers, leaving acceptable surface appearance and strength.
The effects of this incisor were on the examined strength of the treated lumber, on degrade during drying and on the treatability of SPF. The variations in treatability between various sources of western SPF and between the individual species were also evaluated. Finally, in a supplementary study, the effect on treatment quality of increasing the duration of pressure treatment and using higher pressures were determined using one source of SPF.

FRDA Research Report 119 (1288 KB)

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Updated July 24, 2015