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Strategies for improving the performance of plywood adhesive mix fillers from southern yellow pine bark.
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Abstract
Southern yellow pine bark was obtained from an industrial source and subjected to grinding and classification operations to ultimately afford finely ground bark fractions for evaluation as plywood adhesive mix fillers. Specifically, by grinding in a laboratory blender, we were able to generate a bark fraction rich in periderm tissue with its interlocking spiculate stone cells (sclereids). Another significant bark fraction was comprised of cellular debris from the obliterated phloem tissues in bark that are partitioned by the periderms. Through the grinding and ...
<200 10.4 28.7 32.6
Total 100.0 100.0
Grinding operations
Wiley mill and blender
Particle Fraction Fraction ash Ash
size range weight content distribution (a)
(mesh) (%)><200 31.4 12.1 48.2
Total 100.0 100.0
(a) Calculated as a percentage of the sum of the ash present in all
fractions.
(b) ND = not determined.
Table 3. -- Fraction weight and ash distributions for combined whole
bark fractions (><200 0 4.4 4.4 5.9
Total 100.0 100.0 100.0
(a) Calculated as a percentage of the sum of the ash present in all
fractions.
(b) ND = not determined.
Table 4. -- Fraction weight and ash distributions for outer bark sample.
Grinding operations
Wiley mill alone
Particle Fraction Fraction Ash
size range weight ash content distribution (a)
(mesh) (%)><200 11.0 11.0 31.4
Total 100.0 100.0
Grinding operations
Wiley mill and blender
Particle Fraction Fraction Ash
size range weight ash content distribution (a)
(mesh) (%)>
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