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dimensional analysis and the chips in the entire batch rarely follow a normal distribution. Precise characterization of the experimental chip batch would require screening with several types of sorting machines and detailed statistical analysis for each screen and each sorting machine. Research publications usually report only the mean size, minimum, and maximum values for specific linear dimension. Specific surface of the chips seems to be a suitable parameter describing a chip batch, as it accounts for both linear dimensions relationships and the share of individual fractions. Following this assumption, the boards of P5 type with the core layer made of strand chips should have their external layers made of chips with specific surface of about 715 m 2 /kg, which is of a mixture of BB and CC chips. The OSB/3 board, a serious alternative for MFP, due to low coefficient of orientation, can be manufactured using chips with specific surface of 590 m 2 /kg, which is slightly larger than CC chips. CONCLUSIONS 1. This study showed that the described modification of OSB structure, i . e ., replacing the strand chips of external layers with smaller chips, allowed for the manufacturing of OSB/3 using chips up to four times shorter than the standard strand chips. 2. With slight modifications of the gluing degree (core/face), the use of fine chips from a subscreen fraction of a 10 mm mesh screen, should enable the production of P5 type boards. 3. Reports from studies, including chips of different fractions, should be accompanied not only by a sieve analysis, but also by specific surface of the chips. REFERENCES CITED Barnes, D. (2000). “ An integrated model of the effect of processing parameters on the strength properties of oriented stand wood products,” Forest Prod. J. 50(11-12), 33- 42. Barnes, D. (2001). “ A model of the effect of stand length and stand thickness on the strength properties of oriented wood composites,” Forest Prod. J. 51(2), 36-46. Chen, S., Du, C., and Wellwood, R. (2008). “ Analysis of strand characteristics and alignment of commercial OSB panels,” Forest Prod. J. 58(6), 94-98. Cheng, Y., Guan, M., J., and Zhang, Q. S. (2012). “ Selected physical and mechanical properties of bamboo and poplar composite OSB with different hybrid ratios,” Key Eng. Mat. 517, 87-95. DOI: 10.4028/www.scientific.net/KEM.517.87 Derkowski, A., Mirski, R., Dziurka, D., and Popyk, W. (2014). “ Possibility of using accelerated aging tests to assess the performance of OSBs exposed to environmental conditions,” BioResources 9(2), 3536-3549. DOI: 10.15376/biores.9.2.3536-3549 EN 300 (2006). “Oriented Strand Boards (OSB). Definitions, classification and specifications,” European Committee for Standardization, Brussels, Belgium. EN 310 (1993). “Wood -based panels. Determination of modulus of elasticity in bending and of bending strength,” European Committee for Standardization, Brussels, Belgium.
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Mirski et al . (2016). “Non - strand chips OSB,” B io R esources 11(4), 8344-8354.
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