## 3 Results and Discussion
### Tensile Test of Extruded PVB Filament
Figure 14 shows the testing of samples from PVB material at 160 \({}^{\circ}\)C. It shows that all the tested samples broke within the working part. A temperature of 160 \({}^{\circ}\)C for the PVB material indicates a change in the relative elongation (elongation at peak) from 5.9% to 7.576%, compared to the previous values shown in the graphic. \begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline
**Test No** & **Temperature** & \begin{tabular}{c} **Force Peak** \\ **(N)** \\ \end{tabular} & \begin{tabular}{c} **Elongation at** \\ **Break (\%)** \\ \end{tabular} & \begin{tabular}{c} **Elong Peak** \\ **(mm)** \\ \end{tabular} & \begin{tabular}{c} **Strain Peak** \\ **(\%)** \\ \end{tabular} & \
\begin{tabular}{c} **Tensile Stress** \\ **(MPa)** \\ \end{tabular} &
\begin{tabular}{c} **Stress Yield** \\ **(MPa)** \\ \end{tabular} \\ \hline
1 & 160 & 96.88 & 40.278 & 7.576 & 7.576 & 0.025 & 40.27 \\ \hline
2 & 160 & 104.18 & 43.313 & 6.94 & 6.94 & 0.021 & 43.301 \\ \hline
3 & 160 & 98.98 & 41.151 & 7.752 & 7.752 & 0.071 & 40.719 \\ \hline
4 & 160 & 116.1 & 48.269 & 7.747 & 7.747 & 0.017 & 48.26 \\ \hline
5 & 160 & 115.83 & 48.157 & 5.155 & 5.155 & 0.008 & 48.14 \\ \hline
6 & 160 & 111.18 & 46.223 & 5.9 & 5.9 & 0.008 & 46.207 \\ \hline \hline \end{tabular}
\end{table} 
Table 6: Statistical processing of tensile (DIN EN ISO 527-1) [21] test data of PVB filament with a diameter of 1.75 mm and a temperature of 160 \({}^{\circ}\)C.  
Figure 13: Graphic representation of a tensile test of a PVB filament with a diameter of 1.75 mm and a temperature of 155 \({}^{\circ}\)C.  
The gradient of PVB material at a temperature of 175 \({}^{\circ}\)C and the statistical processing of the tensile test are shown in the following table. At this temperature, the \"Elongation at break\" value for all six test samples ranged from 32.179% to 38.095% (Table 7). The graphic display (Figure 15) of the tensile test draws attention to the proportional elongation of the tested material, which ranges from 3.212% to 7.905%. The force with which the test sample was stretched up to the moment of rupture tensile stress ranged from 0.033 MPa to 0.183 MPa. Based on the tensile test data for PVB material with a diameter of 1.75 mm and a temperature range from 140 \({}^{\circ}\)C to 175 \({}^{\circ}\)C, we can conclude that the differences in the results of the tensile test are caused by the influence of external factors influencing [40] the course of the tensile test, as follows:  
* frequency and load status of the tested recycled polyvinyl butyl (PVB);
* the magnitude of the mean stress when loading the polyvinyl butyl;
* state of tension of the recycled polyvinyl butyl;
* aggressiveness and temperature of the environment in which the measurement takes place;
* the shape tested from recycled polyvinyl butyl;
* test sample recycled polyvinyl butyl;
* the existence or assumption of cracks in materials (PVB recycled);
* surface properties of the recycled PVB;
* method of preparing the tested sample (use of material processing technology). Internal factors influencing the course of the tensile test are as follows:
* chemical composition of the recycled PVB;