## 3 Results and Discussion
### Fungi Growth on the Dried Rubber Sheet Product's Surface after Storage  
As is known, the dried sheet product is stored for approximately 6 months at room temperature before supplying it to customers, and this was replicated during this study. Table 4 shows how the type of coagulating material affected fungus growth after storage. Under the NR latex coagulating with acetic acid (Figure 10), the dried sheet surface was found to have fungus growth over 50% of the surface area after approximately 3 months in storage and the referent sheet (sun-dried) displayed the same result. For the latex samples coagulated by using all the wood vinegas, the dried sheet product displayed fungus growth prior to supplying it to the customer. For this reason, the wood vinegas in this study comprised a phenol component which could have prevented the sheet from fungus growth [8; 25; 61; 62]. \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline \multirow{2}{*}{\begin{tabular}{c} **Type of** \\ **Coagulating** \\ **Material** \\ \end{tabular} } & \multirow{2}{*}{\
\begin{tabular}{c} **Velocity** \\ **(m/s)** \\ \end{tabular} } & \multicolumn{4}{c}{**Order of the Reaction Rate Constant**} & \multirow{2}{*}{
\begin{tabular}{c} **Second** \\ **A (h\({}^{-1}\))** \\ \end{tabular} } \\ \cline{3-4} \cline{6-7}  & & **A (h\({}^{-1}\))** & & & & & \\ \hline PR wood vinegar & 0.3 & 18.6 \(\times\) 10\({}^{6}\) & 46,497.8 & 19.1 \(\times\) 10\({}^{6}\) & 45,042.4 & 7.4 \(\times\) 10\({}^{6}\) & 44,997.4 \\  & 0.5 & 15.9 \(\times\) 10\({}^{6}\) & 44,928.9 & 14.2 \(\times\) 10\({}^{6}\) & 42,853.8 & 5.7 \(\times\) 10\({}^{6}\) & 42,028.6 \\  & 0.7 & 12.7 \(\times\) 10\({}^{6}\) & 43,167.8 & 11.3 \(\times\) 10\({}^{6}\) & 41,987.4 & 2.8 \(\times\) 10\({}^{6}\) & 41,256.9 \\ Bb wood vinegar & 0.3 & 20.2 \(\times\) 10\({}^{6}\) & 48,257.4 & 21.2 \(\times\) 10\({}^{6}\) & 46.383.6 & 7.8 \(\times\) 10\({}^{6}\) & 45,227.4 \\  & 0.5 & 17.6 \(\times\) 10\({}^{6}\) & 45,578.6 & 16.1 \(\times\) 10\({}^{6}\) & 44,027.8 & 5.2 \(\times\) 10\({}^{6}\) & 43,227.8 \\  & 0.7 & 12.5 \(\times\) 10\({}^{6}\) & 44,217.4 & 12.5 \(\times\) 10\({}^{6}\) & 42,369.6 & 3.5 \(\times\) 10\({}^{6}\) & 41,828.6 \\ CS wood vinegar & 0.3 & 20.6 \(\times\) 10\({}^{6}\) & 48,828.6 & 21.3 \(\times\) 10\({}^{6}\) & 45,994.7 & 7.1 \(\times\) 10\({}^{6}\) & 45,043.1 \\  & 0.5 & 18.7 \(\times\) 10\({}^{6}\) & 47,307.4 & 15.1 \(\times\) 10\({}^{6}\) & 43,854.8 & 4.9 \(\times\) 10\({}^{6}\) & 42,895.6 \\  & 0.7 & 11.9 \(\times\) 10\({}^{6}\) & 45,267.6 & 11.9 \(\times\) 10\({}^{6}\) & 42,778.9 & 2.8 \(\times\) 10\({}^{6}\) & 41,774.8 \\ Acetic acid & 0.3 & 19.5 \(\times\) 10\({}^{6}\) & 47,528.6 & 204.4 \(\times\) 10\({}^{6}\) & 46,572.4 & 8.3 \(\times\) 10\({}^{6}\) & 45,341.8 \\  & 0.5 & 16.7 \(\times\) 10\({}^{6}\) & 45,347.4 & 15.5 \(\times\) 10\({}^{6}\) & 43,712.9 & 5.9 \(\times\) 10\({}^{6}\) & 42,879.8 \\  & 0.7 & 13.8 \(\times\) 10\({}^{6}\) & 43,978.8 & 12.6 \(\times\) 10\({}^{6}\) & 42,225.6 & 3.3 \(\times\) 10\({}^{6}\) & 41,936.7 \\ \hline \hline \end{tabular}
\end{table} 
Table 3: The activation energy and frequency factor values of the expressed rate constant (PR = para rubber, Bb = bamboo, and CS = coconut shell). \begin{table}
\begin{tabular}{c c} \hline
**Type of Coagulating Material** & **The Fungus Growth after Storage for Approximately Six Months** \\ \hline PR wood vinegar & No \\ Bb wood vinegar & No \\ CS wood vinegar & No \\ Acetic acid & Yes (3–6 month) \\ Reference & Yes (3–6 month) \\ \hline \end{tabular}
\end{table} 
Table 4: The fungus growth on the surface area of the dried sheet product after storage (PR = para rubber, Bb = bamboo, and CS = coconut shell). Figure 9: _Cont._Although fungus problems on the dried sheet could be solved by going through the drying process again, energy consumption and the cost of production would be increased [39; 63]. Additionally, acetic acid can cause harmful effects on humans such as irritation of the nose, throat, and eyes, chest tightness, cough, fever, and headache.