Research Article
Effect of Heartwood and Sapwood Ratio on Adhesion Strength of Finished Wood Species
Table 1
Roughness and adhesions strength test results.
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Species and density | Roughness value () (µm) | Adhesion strength (N/mm2) | | | Spruce | Fir | Alder | Beech | Spruce | Fir | Alder | Beech |
| Heartwood Spruce (0.425 g/cm3) Fir (0.49 g/cm3) Alder (0.52 g/cm3) Beech (0.69 g/cm3) | Planing | 45.50 (6.91) | 41.78 (3.60) | 51.49 (7.25) | 48.30 (3.32) | 1.95 (0.21) | 1.92 (0.26) | 1.98 (0.19) | 2.12 (0.26) | 80 | 43.20 (5.40) | 39.22 (6.01) | 42.36 (4.21) | 42.57 (7.02) | 2.06 (0.26) | 2.05 (0.22) | 2.42 (0.36) | 2.62 (0.22) | 180 | 25.78 (3.73) | 29.99 (4.60) | 31.32 (3.38) | 31.05 (8.24) | 1.97 (0.17) | 2.01 (0.19) | 2.36 (0.33) | 2.56 (0.27) |
| Sapwood Spruce (0.420 g/cm3) Fir (0.48 g/cm3) Alder (0.52 g/cm3) Beech (0.67 g/cm3) | Planing | 42.20 (3.92) | 42.54 (4.39) | 53.37 (4.87) | 50.82 (3.82) | 1.97 (0.30) | 1.88 (0.32) | 2.13 (0.35) | 2.40 (0.33) | 80 | 36.98 (3.98) | 37.00 (7.42) | 37.66 (5.62) | 35.10 (6.14) | 2.06 (0.40) | 2.06 (0.32) | 2.15 (0.28) | 2.42 (0.19) | 180 | 27.53 (8.61) | 32.10 (6.68) | 33.69 (3.40) | 29.85 (3.38) | 1.92 (0.25) | 1.91 (0.29) | 1.92 (0.12) | 2.36 (0.25) |
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Numbers in parentheses are standard deviation values.
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