shows DSC thermograms of RPET compounds with different in extruder cooling processes. It can be seen
only melting endotherms of RPET compounds using air cooling, which presented melting temperatures of RPET in
the RPET compounds as presented in Fig. 1 (a). On the other hand, it can be observed endothermic steps of glass
transition temperatures, exothermic curves of cold crystallization temperatures and melting endotherm of melting
temperatures of RPET in the RPET compounds as shown in Fig. 1 (b). It was considered that RPET was slow
cooling and PET was possible more crystallized during hot air cooling than in the compounds using water cooling
system. From Table 2, crystallinity values of the compounds using air cooling were about 30-33 %, which were over
50% higher than the compounds by the water cooling one. Therefore, the air cooling process provided better
crystallinity of the RPET compounds