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Official Journal of the Japan Wood Research Society

Table 2 Fibrillated bark slurry adhesive composition and bonding quality of radiata pine plywood 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

Mass ratio       
 PF resin (solids)100706050403020
 Fibrillated bark slurry (solids)0304050607080
 Wheat flour24000000
 Other solid components22000000
 Total solids content (%)553635302724212
 Viscosity (Pa s) (23 °C)
Reactive components in adhesive (%)
 PF resin contents32.
 Polyflavanoids contents0.
Bonding test results
 Number of panels4444644
 Number of specimens32323232483232
 Average of shear strength (MPa)30.84 ± 0.21b1.06 ± 0.25a1.07 ± 0.32a0.88 ± 0.25b0.82 ± 0.21b0.81 ± 0.19b0.77 ± 0.22b
 Average wood failure ratio (%)387.2 ± 9.9a72.2 ± 35.3abc76.9 ± 27.2ab65.3 ± 37.6bc56.0 ± 26.0bc52.2 ± 39.0c78.1 ± 20.7a
  1. 1“CF” means “Commercial formulation” refers to a composition of a commercial adhesive using PF resin for plywood
  2. 2This value was not determined but estimated on the basis of the viscosity in the previous study [13]
  3. 3Results are given as the mean ± standard deviation. ANOVA for analysis of variance showed that the means are significantly different (p < 0.001). Same letters within a row are not significantly different as determined by the Tukey’s test (p < 0.05)
  4. 4“PASS” means met the criteria of JAS