. Veneer recovery from second-growth Douglas-fir. Veneers and veneering; Douglas fir. there were no significant differences in the amounts of veneer recovered. Veneer gvade and growth rate. — Linear regression and analysis of covar- iance were run to test if there was any difference in veneer grade recovery between the lightly stocked and the mod- erately or densely stocked stands. The dependent variable was percent of grades A through C veneer with diameter as the independent variable. Both the slopes of the lines and the means of the lines (fig. 11) were different at the 1-percent probabilit
. Veneer recovery from second-growth Douglas-fir. Veneers and veneering; Douglas fir. there were no significant differences in the amounts of veneer recovered. Veneer gvade and growth rate. — Linear regression and analysis of covar- iance were run to test if there was any difference in veneer grade recovery between the lightly stocked and the mod- erately or densely stocked stands. The dependent variable was percent of grades A through C veneer with diameter as the independent variable. Both the slopes of the lines and the means of the lines (fig. 11) were different at the 1-percent probability level. OTHER PRODUCTS From the long logs brought to the mill for peeling there were 763 8-foot blocks peeled. In addition, there were sixty 8-foot blocks from 7 to 11 inches in diameter with a net scale of 1, 290 feet which were not peel able but were suitable for studs, and thirteen 4-foot blocks from 11 to 18 inches with a gross scale of 360 board feet suitable for peeling on a core lathe. There were also 739 peeler cores suitable for making studs and 34 suitable only for chipping. SUMMARY AND CONCLUSIONS Second-growth Douglas-fir does represent a resource suitable for the pro- duction of veneer, particularly in the structural sheathing grades. The combination of peeling thickness and clipping patterns produced different veneer grade mixes, with a higher per- centage of grades A through C being pro- duced by clipping for these grades. Clipping for grade caused a signifi- cant decline in the recovery ratio but no significant drop in the percent of block cubic volume recovered as veneer. PERCENT 100 r- MODERATELY OR DENSELY STOCKED STANDS. 20 - 10 - 0 I—'—I—I—i—I—i—i 1 I I 1 I i i L_j i i i I i i i_i I 5 10 15 20 25 30 DIAMETER (INCHES) Figure 11.—Percent of veneer in grades A through C over diameter for blocks peeled 1/6-inch, by stocking. The differences in grade and recov- ery are partially a function of intended use. Veneer peeled l/6-inch is used primar
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Keywords: ., bookcentury1900, bookcollectionbiodiversi, booksubjectdouglasfir
