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not be met. In addition, differences between parallel and perpendicular MOE/MOR values decreased depending on the increasing WPE amount. The reason for the decrease in IB values can be explained with the weak adhesion between wood strands and WPE. This situation leads decrease of MOE/MOR values. In this case, by increasing resin level IB strength of OSBs can be enhanced depending on increased WPE amount (Maloney 1977). Therefore, the more WPE is used in boards, the more isotropic they become. Similar results were obtaine d in a study by Ayr ı lm ı s et al. (2009). In his study, MOE/MOR values decreased depending on increasing waste tire rubber amount. Table 3. Average Modulus of Elasticity, Modulus of Rupture and Internal Bond Values at Static Bending of OSB Panels Produced by Adding WPE in Various Ratios
Polyeth- ylene
Modulus of elasticity (MOE) (N/mm 2 )
Modulus of rupture (MOR) (N/mm 2 )
Internal bond (IB) (N/mm 2 )
Wood
%
%
//
//
Untreated
24 h
┴
┴
5728 (358) A [4] 5034 (340) B [4] 4034 (371) C [3] 2751 (296) D [1] 2208 (226) E [*] 1506 (242) F [*]
0.43 (0.03) A [3] 0.40 (0.02) B [3] 0.34 (0.04) C [3] 0.27 (0.05) D [*1] 0.21 (0.03) E [*] 0.19 (0.04) E [*]
0.07 (0.02) A 0.09 (0.01) B 0.11 (0.02) C 0.12 (0.02) D 0.16 (0.03) E
100
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3355 (353) A [4]
33 (2) A [4]
24 (5) A [4]
90
10
3019 (315) AB [4]
30 (4) A [4]
21 (4) AB [4]
80
20
2717 (297) B [4]
22 (2) B [3]
19 (1) BC [4]
70
30
1833 (258) C [3]
18 (1) C [2]
16 (3) C [4]
60
40
1277 (261) D [1]
15 (2) D [1]
13 (2) DE [3]
50 0.16 (0.04) E *Groups with the same letters in each column indicate that there is no statistical difference (pr < 50 1040 (167) D [*] 14 (1) D [1] 11 (2) E [3] 0.05) between the samples according to the Duncan’s multiple range test . *Data were statistically analyzed by means of average and standard deviation. *Quality requirements were compared to OSB type 1/2/3/4 (EN 300 OSB minimum property requirement 2006) and are notated in brackets. The results of Duncan’s multiple range tests are also shown in Table 3 using letters. The average MOE parallel to the major axis of the OSBs containing WPE ranged from 5728 to 1506 N/mm 2 , and values perpendicular to the major axis ranged from 3355 to 1040 N/mm 2 . The average MOR parallel to the major axis values of the OSBs containing WPE ranged from 33 to 14 N/mm 2 , and values perpendicular to the major axis ranged from 24 to 11 N/mm 2 . Ayr ı lm ı s et al. (2009) stated that the MOE and MOR values of the OSBs with tire rubber can be enhanced by increasing the amount of resin. Wilson (1980) researched the correlation between resin amount and mechanical properties and observed that mechanical properties (MOR, MOE, and IB) improved with an increase in the amount of resin. Therefore, in this study, the decrease in the values of some mechanical properties due to an increase of WPE can be compensated by adding extra resin. According to the results of Table 3, the IB values of unsubmerged OSBs diminished from 0.43 to 0.19 N/mm 2 with the increase of WPE amount; however IB values of panels that are exposed to water submersion for 24 h increased from 0.07 to 0.16 N/mm 2 with the increase of WPE amount;
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Yorur (2016 ). “Waste PE and effects on OSB,” B io R esources 11(1), 2483-2491.
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