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PEER-REVIEWED ARTICLE
24 h to 48 h was much bigger in manufactured OSB because wood absorbs the most amount of water especially in 24 h; manufactured OSB that were produced using polyethylene does not absorb water as rapidly as wood. Because of the hydrophobic properties of polyethylene, the TS values of OSB panels manufactured using WPE decreased with an increasing amount of WPE. These results were in agreement with a study carried out by Ayr ı lm ı s et al. (2009). In the cited study, by increasing the rubber content to 30% in OSB, TS values decreased from 21.1% to 14.3%. Linear results have been obtained between moisture content and thickness swelling in particleboard (Watkinson and Gosliga 1990). Additionally, Linville (2000) stated that board properties and TS are influenced by resin level. Yapici (2008) researched TS values of OSBs depending on the amount of adhesive and observed that with an increase in the adhesive amount from 3% to 6%, TS values decreased 49%. In the present study, although the amount of adhesive was fixed (6%) in OSB panels manufactured with WPE, TS values decreased from 27.46% to 8.11%, depending on the WPE used in OSB. This may result in reduction of costs and contribute to greater recycling of WPE. The quality requirements were compared to OSB types 1-2-3-4 (EN 300 2006), and the results are shown in brackets in Table 2. According to these results, the control panel met the minimum requirements of type 1, and 40-50% polyethylene-containing panels met the minimum requirements of type 4, regarding TS. Homogeneous groups for TS are shown by Duncan’s multiple c omparison tests (Table 2). It was observed that there was a statistical difference among the average TS values of the panels. WA values followed a similar pattern to the values of TS. Accordingly, WA values after 24 and 48 h were considerably lower than the control values. The highest value of WA after 24 h was 65.78% in the non- WPE panel sample, and the lowest value of WA after 24 h was 22.47% in the sample with 50% WPE. The highest value of WA after 48 h was 70.97% in the non-WPE sample, and the lowest value of WA after 48 h was 23.97% in the sample with 50% WPE. Homogeneous groups for WA were shown by Duncan’s multiple c omparison tests (Table 2). It was observed that there was a statistical difference among the average WA values of the panels. Similar results were obtained by (Yilgor et al . 2014). According to his study, water may have penetrated through the small cracks and fractures occurred during panel manufacturing process using waste Tetra Pak. In his study, fibers were not coated enough by melted LDPE in Tetra Pak so the penetration of water could not have been prevented wholly. Modulus of Elasticity, Modulus of Rupture, and Internal Bond Average and standard deviation values of MOE, MOR, and IB of OSB panels are shown in Table 3. MOR and MOE have important roles when describing the mechanical properties of OSB panels. Average values of modulus of rupture (MOR) and modulus of elasticity (MOE) at static bending in the parallel and perpendicular directions, as well as the internal bond (IB) for each OSB panel are given in Table 3. According to the results, there was a significant difference among the manufactured panels for both parallel and perpendicular MOR. As shown in Table 3, MOE and MOR values of the OSB panels decreased with increasing WPE amount when compared to the control panels. Similar trends and results between the MOE and MOR values were obtained. For MOE and IB, when the WPE amount in OSB panels exceeded 30%, the minimum quality requirements of EN 300 could
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Yorur (2016 ). “Waste PE and effects on OSB,” B io R esources 11(1), 2483-2491.
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