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Official Journal of the Japan Wood Research Society

Table 3 Compressed layer(s) position, compression percent, surface hardness

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

Wood Position of compressed layer(s) Compression (mm) Compression rate (%) Surface hardness (N/mm2) Surface hardness increasing percentage (%)
Sugi heartwood Control 0 - 4.34 (0.71)
Surface 6 23.1 10.49 (0.61) 141.53
Interior 8.60 (1.18) 98.84
Center 6.40 (0.99) 47.65
Surface 10 33.3 12.15 (1.34) 181.37
Interior 8.85 (1.27) 104.60
Center 7.02 (1.26) 62.08
Sugi sapwood Control 0   8.24 (1.19)
Surface 6 20.0 13.51 (1.61) 64.55
Interior 9.60 (1.03) 16.64
Center 8.83 (0.84) 7.25
Surface 10 33.3 27.92 (2.67) 240.75
Interior 13.19 (1.97) 60.60
Center 8.61 (0.81) 4.55
Hinoki Control 0   11.75 (1.85)
Surface 5 20.0 23.04 (2.70) 100.27
Interior 14.39 (2.29) 23.52
Center 12.17 (1.06) 3.91
  1. Value in () is standard deviation of six replicates under each condition