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PEER-REVIEWED ARTICLE
whereas OSB panels are exposed to submersion in water, internal forces are weakened, which results in swelling of the panels. These results may be explained with the existence of WPE. In addition, there was a statistical difference among the average IB values of the panels. The bond strength values showed similar trends to the results of MOR and MOE tests. Screw Withdrawal Resistance Screw withdrawal resistance (SWR) has an important role when describing mechanical properties of OSB panels because OSB panels are generally fixed with screws in various construction works. Strength values obtained in experiments for 3.5 and 4 mm screws, as well as average and standard deviation values of SWR-treated OSB panels are shown in Table 4. Table 4. Average Screw Withdrawal Resistance Values of OSB Panels Produced by Adding WPE in Various Ratios Wood Polyethylene 3.5 × 40 4 × 40 % % Untreated (N) 24 h (N) Untreated (N) 24 h (N) 100 ------ 584 (45) A 258 (35) A 690 (42) A 302 (55) A 90 10 639 (77) A 313 (45) B 761 (81) AB 352 (43) AB 80 20 707 (75) B 345 (45) B 814 (90) B 418 (77) B 70 30 835 (68) C 396 (68) C 943 (88) C 504 (62) C 60 40 926 (69) D 421 (35) C 1019 (66) C 601 (87) D 50 50 975 (71) D 481 (57) D 1138 (94) D 614 (78) D *Groups with the same letters in each column indicate that there is no statistical difference (pr < 0.05) between the samples according to t he Duncan’s multiple range test . *Data were statistically analyzed by means of average and standard deviation. Homogeneous groups for SWR are shown b y Duncan’s tests (Table 4). It wa s observed that there was a statistical difference among the average SWR values of the panels. SWR values after 24 h were considerably lower than the control values. It was observed that the greater the increase of WPE, the greater the increase in SWR values when compared to control samples. The highest value of SWR (3.5 × 40) was 975 (N) for 50% WPE sample, and the lowest value was 258 (N) for the non-WPE control sample after 24 h. The highest value of SWR (4 × 40) was 1138 (N) for 50% WPE sample, and the lowest value was 302 (N) for the non-WPE control sample after 24 h. Eckelman (1990) studied the SWR properties of wood composite materials using various processing variables. He observed that SWR and IB values have an interaction, and that the density of boards improves SWR values. CONCLUSIONS 1. This study investigated the physical and mechanical properties of OSBs manufactured with waste polyethylene. According to the results, the amount of waste polyethylene influenced the mechanical and physical properties of the OSB panels. 2. By using WPE materials in OSB panels, thickness swelling, humidity, dimensional stability, water absorption, and screw withdrawal resistance of the samples were
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Yorur (2016 ). “Waste PE and effects on OSB,” B io R esources 11(1), 2483-2491.
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