# Experimental Investigation of Vertical Density Profile of Medium Density Fiberboard in Hot Press
## 3 Results and Discussions
### Experiment No. 5  
Figure 12 shows the vertical density profile of X-ray graphs in 5 th specimen, whereas Tables 20-23 illustrate the detailed experimental data at temperature = 220 \({}^{\circ}\)C, cycle time = 265 s, pressure = 155 bar, moisture content = 8.00%. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multirow{2}{*}{**S.No.**} & **Density** & **Piece** & **Weight** & **Length** & **Width** & **Thickness** \\  & **Kg/m\({}^{3}\)** & **No** & **(g)** & **(mm)** & **(mm)** & **(mm)** \\ \hline
1 & 744 & L1 & 268.24 & 200 & 100 & 18.03 \\
2 & 721 & L2 & 260.11 & 200 & 100 & 18.05 \\
3 & 726 & L3 & 261.56 & 200 & 100 & 18.01 \\
4 & 725 & L4 & 260.78 & 200 & 100 & 17.98 \\
5 & 724 & L5 & 261.31 & 200 & 100 & 18.05 \\
6 & 721 & L6 & 259.78 & 200 & 100 & 18.02 \\
7 & 721 & R6 & 260.04 & 200 & 100 & 18.03 \\
8 & 725 & R5 & 260.98 & 200 & 100 & 17.99 \\
9 & 724 & R4 & 260.64 & 200 & 100 & 17.99 \\
10 & 725 & R3 & 261.25 & 200 & 100 & 18.01 \\
11 & 724 & R2 & 260.65 & 200 & 100 & 18.01 \\
12 & 750 & R1 & 269.78 & 200 & 100 & 17.99 \\ \hline \hline \end{tabular}
\end{table} 
Table 20: Density profile across thickness. \begin{table}
\begin{tabular}{c c c c c} \hline \hline \multirow{2}{*}{**Sample**} & **P.max** & **Strength** & **Sample Weight** & **Density** \\  & **N** & **N/mm\({}^{2}\)** & **(g)** & **kg/mm\({}^{3}\)** \\ \hline Middle M1 of & 1456 & 0.58 & 27.12 & 678 \\ Middle M2 & 1515 & 0.61 & 26.52 & 663 \\ Middle M3 & 1378 & 0.55 & 26.13 & 653 \\ Middle M4 & 1404 & 0.56 & 25.54 & 639 \\ Middle M5 & 1511 & 0.60 & 27.76 & 694 \\ Average & & 0.58 & & 665 \\ \hline \hline \end{tabular}
\end{table} 
Table 18: Internal bonding test results. \begin{table}
\begin{tabular}{c c c c c} \hline \hline \multirow{2}{*}{**Density**} & \multicolumn{1}{c}{Average} & \multicolumn{1}{c}{750} & kg/m\({}^{3}\) \\ \cline{2-5}  & Min. & Value & 525 & kg/m\({}^{3}\) \\ \cline{2-5}  & Position & 7.052 & mm \\ \cline{2-5}  & Max. Left & Value & 755 & kg/m\({}^{3}\) \\ \cline{2-5}  & Position & 0.461 & mm \\ \cline{2-5}  & Max. Right & Value & 746 & kg/m\({}^{3}\) \\ \cline{2-5}  & Position & 0.836 & mm \\ \hline
**Ratio** & Min./Avg & & 82.4 & \% \\ \hline \hline \multirow{2}{*}{**Gravimetric**} & Width & 50 & mm \\ \cline{2-5}  & Depth & 50 & mm \\ \cline{2-5}  & Weight & 28.78 & g \\ \hline \hline \end{tabular}
\end{table} 
Table 19: Experimental data of 4 thsample. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multirow{2}{*}{**Sample**} & **P.max** & **Strength** & **Span** & **Sample Weight** & **Density** \\  & **N** & **N/mm2** & **mm** & **(g)** & **kg/mm3** \\ \hline Middle M1 of & 827 & 31.01 & 320 & 207.53 & 701 \\ right & 856 & 32.10 & 320 & 205.11 & 693 \\ Middle M3 & 898 & 33.68 & 320 & 203.68 & 688 \\ Middle M4 & 861 & 32.29 & 320 & 207.09 & 700 \\ Middle M5 & 854 & 32.03 & 320 & 208.65 & 705 \\ Average & & 32.22 & & 697 \\ \hline \hline \end{tabular}
\end{table} 
Table 21: Bending tests. Figure 12: X-ray vertical density profile of 5 thspecimen. Five samples of medium density fiber board were produced at various temperatures, pressures, cycle times, and moisture contents. In the first sample, the temperature was 200 \({}^{\circ}\)C with a pressure of 145 bar, cycle time of 260 s, and moisture of 8.00%. In this experiment, all of the parameters were taken at the minimum conditions, but the result of bending and internal bonding were not good (compared to standards). In the second sample, a minor increase in all process parameters was observed, with a temperature of 205 \({}^{\circ}\)C, a pressure of 155 bar, cycle time of 270 s, and moisture of 10.00%, and, as a result, the bending and internal bonding decreased. In third sample, we observed a further increase in temperature (210 \({}^{\circ}\)C) with pressure (150 bar) and cycle time(265 s) and a decrease in moisture (8.50%) with respect to the previous experiments' moisture content. The results of bending and internal bonding were notably better than those of the previous experiments.