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PEER-REVIEWED ARTICLE
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Strand thickness - 0.02/0.04 inch Strand thickness - 0.125 inch Chip thickness - 0.007 - 0.024 inch
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0 1020304050 Chip length -[inch] 0
Fig. 3. Correlation of Hankinson equations with the effect on MOR of strand length (red and blue line(from Barnes 2000)
0.0 0.4 0.8 1.2 1.6 2.0 2.4
U MOR U MOE
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BB
DD
OSB
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AA
CC
EE
MFP
Type of board
Fig. 4. Orientation coefficient of the investigated boards, where U =MOR(E) max /MOR(E) min The parameter joining such properties as chip linear dimensions, their mutual relations ( O N M ), fractional composition, or a resin content (treated as the ratio of the dry weight of adhesive to the dry weight of the wood) is a resination coefficient (RC), i . e ., the ratio of the dry weight of the adhesive to the specific surface of the chips. In this study, where the resin content was the same for all types of chips, the changes in the modulus of rigidity and modulus of elasticity should be treated as changes of exponential character (Fig. 5). Coefficient of fit (R 2 ) for the equation expressed as MOR( E ) = a + b exp(- RC / c ) was around 0.99, irrespective of the investigated axis. The nature of the MOR and MOE changes for the shorter axis may be also considered linear; however, the coefficient of fit was lower and ranged around 0.93.
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Mirski et al . (2016). “Non - strand chips OSB,” B io R esources 11(4), 8344-8354.
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