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Compression rolling of Sitka spruce and Douglas-fir

Compression rolling of Sitka spruce and Douglas-fir

Forest Products Journal 38(2): 16-18

Flat- and quarter-sawn boards, 650x100x25 mm, were conditioned to 20% m.c. and passed between rollers of 121 mm diam. under compressions of 6%, 9%, 10% and 12% at feed speeds of 800, 1000 and 1500 mm/sec. They were then end sealed, pressure impregnated with CCA sol. using a Bethel cycle and allowed to drip dry before being weighed to determine vol. uptake of CCA. The deformation and raised grain (earlywood raised above latewood) resulting from rolling are described.

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Accession: 001552317

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