Skip to main content

Official Journal of the Japan Wood Research Society

Table 4 Comparison between fibrillated bark slurry adhesives and fibrillated and freeze-dried bark adhesives

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

Adhesives

 

Fibrillated bark slurry adhesive

fibrillated and freeze-dried bark adhesive2

CF1

1-1

1-2

1-3

1-4

1-5

1-6

2-1

2-2

2-3

2-4

2-5

2-6

Total solids content (%)

55

39

33

30

27

24

21

36

35

30

27

24

21

Reactive components in adhesive (%)

 PF resin content

32.0

27.3

19.8

15.0

10.8

7.2

4.2

25.2

21.0

15.0

10.8

7.2

4.2

 Polyflavanoid content

0.0

6.2

6.9

7.9

8.5

8.9

8.9

5.7

7.4

7.9

8.5

8.8

8.8

Bonding test results

 Average of shear strength3

0.84 ± 0.21c

1.06 ± 0.25ab

1.07 ± 0.32a

0.88 ± 0.25bc

0.82 ± 0.21c

0.81 ± 0.19c

0.77 ± 0.22c

1.04 ± 0.28ab

1.13 ± 0.30a

0.74 ± 0.15c

0.71 ± 0.13c

0.74 ± 0.24c

0.70 ± 0.13c

 Average wood failure ratio3

87.2 ± 9.9ab

72.2 ± 35.3abc

76.9 ± 27.2abc

65.3 ± 37.6bcd

56.0 ± 26.0cde

52.2 ± 39.0de

78.1 ± 20.7abc

89.1 ± 15.5ab

90.9 ± 13.3a

72.0 ± 33.3abcd

32.5 ± 35.3ef

21.9 ± 25.6f

27.8 ± 28.6f

 Judgment of test results (JAS)4

PASS

PASS

PASS

PASS

PASS

PASS

PASS

PASS

PASS

PASS

PASS

PASS

PASS

  1. 1“CF” means “Commercial formulation” refers to a composition of a commercial adhesive using PF resin for plywood
  2. 2All the results are described in the previous paper [13]
  3. 3ANOVA 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 Tukey’s test (p < 0.05)
  4. 4“PASS” means met the criteria of JAS