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Official Journal of the Japan Wood Research Society

Table 2 Compressed layer(s) number and thickness, and density of the sandwich compressed timbers (SCT)

From: Sandwich compression of sugi (Cryptomeria japonica) and hinoki (Chamaecyparis obtusa) wood: density distribution, surface hardness and their controllability

Wood Compressed layer(s) Compressed layer(s) density (g/cm3) Compressed layer(s) thickness (mm) Average density (g/cm3)
Position Compression (mm) Number Average Maximum Top Bottom Top Bottom
Sugi heartwood Control 0 0.706 (0.079) 0.336 (0.035)
Surface 6 2 0.661 (0.060) 0.834 (0.060) 0.681 (0.085) 0.641 (0.056) 2.68 (0.38) 2.50 (0.55) 0.394 (0.044)
Interior 2 0.624 (0.079) 0.740 (0.060) 0.631 (0.041) 0.617 (0.065) 2.63 (0.39) 2.52 (0.57) 0.410 (0.052)
Center 1 0.694 (0.089) 0.852 (0.012) 0.694 (0.089) 6.05 (0.55) 0.411 (0.042)
Surface 10 2 0.776 (0.073) 0.903 (0.096) 0.805 (0.064) 0.747 (0.085) 3.40 (0.60) 3.54 (0.57) 0.495 (0.007)
Interior 2 0.681 (0.033) 0.816 (0.051) 0.659 (0.034) 0.703 (0.042) 4.04 (0.44) 3.86 (0.75) 0.497 (0.009)
Center 1 0.736 (0.065) 0.850 (0.037) 0.736 (0.065) 7.64 (1.27) 0.496 (0.018)
Sugi sapwood Control 0 0.710 (0.065) 0.464 (0.032)
Surface 6 2 0.727 (0.054) 0.833 (0.056) 0.712 (0.073) 0.742 (0.065) 2.97 (0.26) 3.20 (0.63) 0.559 (0.022)
Interior 2 0.721 (0.044) 0.827 (0.039) 0.726 (0.050) 0.716 (0.050) 2.68 (0.39) 3.02 (0.60) 0.562 (0.025)
Center 1 0.736 (0.065) 0.850 (0.037) 0.736 (0.065) 7.64 (1.27) 0.513 (0.023)
Surface 10 2 0.736 (0.055) 0.823 (0.061) 0.739 (0.080) 0.733 (0.054) 3.90 (0.60) 4.28 (0.95) 0.641 (0.037)
Interior 2 0.723 (0.079) 0.794 (0.075) 0.724 (0.099) 0.722 (0.064) 4.83 (0.69) 5.19 (0.45) 0.652 (0.016)
Center 1 0.690 (0.043) 0.791 (0.034) 0.690 (0.043) 8.85 (0.89) 0.631 (0.026)
Hinoki Control 0 0.611 (0.034) 0.481 (0.029)
Surface 5 2 0.816 (0.040) 0.907 (0.023) 0.849 (0.048) 0.782 (0.027) 3.03 (0.46) 2.40 (0.26) 0.571 (0.017)
Interior 2 0.773 (0.059) 0.871 (0.089) 0.799 (0.074) 0.746 (0.051) 3.10 (0.47) 2.71 (0.40) 0.580 (0.013)
Center 1 0.744 (0.068) 0.850 (0.097) 0.744 (0.068) 6.94 (0.72) 0.584 (0.046)
  1. Value in () is standard deviation of six replicates under each condition