Research Article
Adhesion Strength of Cellulosic Varnish Coated Wood Species as Function of Their Surface Roughness
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 species () |
519.576 | 3 | 173.192 | 7.814 | *** | Effect of grain orientation () | 313.361 | 1 | 313.361 | 14.137 | *** | Effect of sanding () | 4197.226 | 1 | 4197.226 | 189.359 | *** | | 340.698 | 3 | 113.566 | 5.124 | ** | | 867.98 | 3 | 289.323 | 13.053 | *** | | 35.058 | 1 | 35.058 | 1.582 | NS | | 231.369 | 3 | 77.123 | 3.479 | * | Error | 8511.533 | 384 | 22.165 | | | Total | 446911.543 | 400 | | | |
| Source | Sum of squares | df | Mean square | value | Significance level |
| Adhesion strength | Effect of species () | 5.650 | 3 | 1.883 | 30.206 | *** | Effect of grain orientation () | 0.896 | 1 | 0.896 | 14.367 | *** | Effect of sanding () | 0.746 | 1 | 0.746 | 11.965 | *** | | 0.520 | 3 | 0.173 | 2.783 | * | | 0.064 | 3 | 0.021 | 0.343 | NS | | 0.183 | 1 | 0.183 | 2.933 | NS | | 0.081 | 3 | 0.027 | 0.431 | NS | Error | 18.953 | 304 | | | | Total | 1374.395 | 320 | | | |
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NS: nonsignificant; significant at the level; significant at the 0.01 level; significant at the level.
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