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Official Journal of the Japan Wood Research Society

Journal of Wood Science Cover Image

Table 3 Fibrillated bark slurry adhesive composition and bonding qualities of hinoki and karamatsu plywoods from the continuous 72-h boiling test (JAS)

From: Plywood adhesives using PF resin with fibrillated bark slurry from radiata pine (Pinus radiata D. Don): utilization of flavonoid compounds from bark and wood. IV

AdhesivesCF1123CF1123
Mass ratio
 PF resin (solids)100605040100605040
 Fibrillated bark slurry (solids)04050600405060
 Wheat flour1500015000
 Other solid components2200022000
Total solids content (%)5534302755343027
Viscosity (Pa s) (23 °C)1.61.91.62.11.71.91.62.1
Bonding test results
Plywood speciesHinoki (Japanese cypress)Karamatsu (Larix species)
Number of panels44444123
Number of specimens323232323281624
Average of shear strength (MPa)21.02 ± 0.37a1.18 ± 0.28a1.24 ± 0.37a1.17 ± 0.39a1.05 ± 0.33a0.98 ± 0.34a0.86 ± 0.36a0.87 ± 0.24a
Average wood failure ratio (%)293.8 ± 5.5a23.1 ± 33.2c21.9 ± 25.3c47.5 ± 35.6b94.4 ± 8.4a95.0 ± 8.7a21.8 ± 17.6b47.5 ± 30.3b
Judgment of test results (JAS)3PASSPASSPASSPASSPASSPASSPASSPASS
  1. 1“CF” means “Commercial formulation” refers to a composition of a commercial adhesive using PF resin for plywood
  2. 2Results are given as the mean ± standard deviation. ANOVA for analysis of variance showed that the means are significantly different (p < 0.001). The same letter within a row are not significantly different as determined by the Tukey’s test (p < 0.05)
  3. 3“PASS” means met the criteria of JAS