Research Article
Effect of Heartwood and Sapwood Ratio on Adhesion Strength of Finished Wood Species
Table 2
Statistical analysis of the roughness and adhesion strength test results.
| Source | Sum of squares | df | Mean square | value | Significance level |
| Surface roughness | Effect of heartwood and sapwood (A) | 196,28 | 1 | 196,28 | 6,480 | NS | Effect of sanding (B) | 28402.39 | 2 | 14201.19 | 468.825 | | Effect of species (C) | 2845.37 | 3 | 948.46 | 31.312 | | A × B | 1222.69 | 2 | 611.34 | 20.182 | | A × C | 192.06 | 3 | 64.02 | 2.114 | NS | B × C | 1693.82 | 6 | 282.30 | 9.320 | | A × B × C | 359.39 | 6 | 59.90 | 1.977 | NS | Error | 17447.63 | 576 | 30.29 | | | Total | 956260.10 | 600 | | | |
| Adhesion strength | Effect of heart and sapwood (A) | 0.57 | 1 | 0.57 | 7.70 | NS | Effect of sanding (B) | 2.82 | 2 | 1.41 | 18.96 | | Effect of species (C) | 15.29 | 3 | 5.09 | 68.46 | | A × B | 1.91 | 2 | 0.95 | 12.84 | | A × C | 0.60 | 3 | 0.20 | 2.72 | | B × C | 0.56 | 6 | 0.09 | 1.26 | NS | A × B × C | 1.66 | 6 | 0.27 | 3.71 | | Error | 33.95 | 456 | 0.07 | | | Total | 2250.38 | 480 | | | |
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NS: nonsignificant. Significant at the α = 0.05 level. Significant at the 0.01 level. Significant at the α = 0.001 level.
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