Global Journal of Science Frontier Research, G: Bio-Tech & Genetics, Volume 22 Issue 2
Where: MOR= Modulus of rupture (MPa), T= Temperatures requirement thermally (°C), t= Times requirement thermally (min), (PF)=Phenol formaldehyde UF multiple regression model (Eq 5x) considered above average (R 2 =0.79) MOR(UF)=0+0.3253*T+(-1.5801) *t (Eq 5x) Where: MOR= Modulus of rupture (MPa), T= Temperatures requirement thermally (°C), t= Times requirement thermally (min), (UF)= Urea formaldehyde, PF multiple regression model (Eq 5X) considered as high (R 2 =0.85) © 2022 Global Journals 1 Year 2022 82 Global Journal of Science Frontier Research Volume XXII Issue ersion I VII ( G ) Physical and Mechanical Properties of Teak (Tectona Grandis L.Fil.) Thermo-Plywood from Plantations in Lao P.D.R MOE(PF)=0+51.2504*T+(-43.7003) *t (Eq 5x) Where: MOE= Modulus of Elasticity (MPa), T= Temperatures requirement thermally (°C), t= Times requirement thermally (min), (PF)=Phenol formaldehyde UF multiple regression model (Eq 5x) considered above average (R 2 =0.88) MOE(UF)=0+50.5502*T+(-56.3688) *t (Eq 5x) Where: MOE= Modulus of Elasticity (MPa), T= Temperatures requirement thermally (°C), t= Times requirement thermally (min), (UF)=Urea formaldehyde, Table 1: Physical and mechanical properties of teak plywood in the thermal treatment of different level of temperature in PF adhesive Properties Temperature (°C) CL±Std 180±Std 200±Std 220±Std 240±Std Density (g/cm 3 ) 0.705±0.04 0.683±0.03 0.667±0.03 0.683±0.04 0.681±0.04 Water absorption (%) 31.07±4.60 37.12±6.59 32.07±11.44 35.97±5.54 33.62±5.37 Thickness swelling (%) 3.08±1.12 4.56±2.70 1.72±3.34 3.54±2.85 3.59±2.11 MOR (MPa) 63.33±20.59 58.10±22.85 66.65±20.55 64.55±21.02 65.81±18.06 MOE (MPa) 12,734.54±2,246.33 11,383.85±2,265.14 10,945.29±1,634.48 9,673.65± 2,407.91 9,948.38± 2,229.25 Shearing (MPa) 13.55±2.97 12.53±3.20 12.76±3.22 11.39±3.58 13.51±3.46 Hardness (MPa) 22.09±6.35 18.95±5.11 24.56±6.01 22.04±6.15 22.30±6.78 Table 2: Physical and mechanical properties of teak plywood in the thermal treatment of length of time in PF adhesive Properties Time (min) CL±Std 4±Std 8±Std 12±Std Density (g/cm 3 ) 0.705±0.040 0.676±0.041 0.679±0.038 0.681±0.033 Water absorption (%) 31.07±4.60 37.56±7.16 34.59±7.04 32.25±9.25 Thickness swelling (%) 3.08±1.12 3.29±2.97 4.00±2.45 2.77±3.28 MOR (MPa) 68.33±20.59 62.93±19.52 66.09±21.90 62.32±21.12 MOE (MPa) 12,734.54±2,246.33 10,887.21±2,000.07 10,487.39±2,331.09 10,088.77±2,370.60 Shearing (MPa) 13.55±2.97 12.74±2.74 12.50±3.87 12.40±3.63 Hardness (MPa) 22.09±6.35 21.09±6.00 23.49±6.54 21.79±6.31 V. C onclusion 1. Density of teak plywood thermal treatment in control, at 180, 200, 220, and 240°C in the length of time in control, 4, 8 and 12 min ranged from 0.667- 0.705 g/cm 3 , thermal treatment decreased density of teak plywood. A control was significant different on thermal treatment of different level of temperature and length of time. 2. Water absorption of teak thermal treatment in control, at 180, 200, 220, and 240°C in the length of time in control, 4, 8 and 12 min range from 31.07- 37.12%. The different level of temperature and length of time the WA increases. The control was significant different with thermally. 3. Swelling thickness of plywood thermal treatment in different level of temperature as control, at 180, 200, 220, and 240°C base on length of time 4, 8, and min was range from 1.72-4.56%. The thermal treatment at 180, 220, 240 °C was increased to significant different with control, and length of time the control was no significant different. 4. The MOR of control sample was 68.33±20.59 MPa the thermal treatment plywood was fluctuated. The different level of temperature the control was only significant with at 180°C and but another group at 200, 220, and 240 °C was no significant. The length of time on 4, 8, and 12 min was no significant different.
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