Evaluation of two surfacing methods on black spruce wood in relation to gluing performance

Journal of Wood Science

Official Journal of the Japan Wood Research Society

Table 5 Mean glueline shear strength (SS) and percent wood failure (WF) of black spruce surfaces prepared by peripheral straight-edge planing using four rake angles for samples without and with an aging treatment

Rake angle (°)	Unaged samples		Aged samples		Adhesion loss
Rake angle (°)	SS (MPa)	WF (%)	SS (MPa)	WF (%)	SS (%)	WF (%)
15	8.8^a (0.2)^bB^c	55 (2)a	5.8 (0.2)C	36 (2)b	34	35
20	9.4 (0.1)A	59 (2)a	6.0 (0.1)C	36 (2)b	36	39
25	9.1 (0.1)B	58 (2)a	5.9 (0.2)C	41 (2)b	35	29
30	9.0 (0.2)B	58 (3)a	6.4 (0.2)C	41 (2)b	28	29

^aMean of 120 replicates (four wavelengths pooled)
^bStandard error of the mean in parentheses
^cMeans followed by the same letter are not significantly different at 5 % probability level. Uppercase letters are for SS comparison; lowercase letters are for WF comparison (in both cases for aged and unaged samples taken together)