... tyre,vulcanization and quality check.(1) Mixing of Raw Material:(Use Mixing Machine)First,mix the natural rubber,carbon black ... the mixture in mixer machine,and produce sizing material.(2)Extrusion:(Using Extruding Machine)Feed sizing material into extruding machine,and extrude semi- ... , 8.5MPA, 9MPA,10.5MPA(inner tube)4. raw material:high quality butyl or natural rubber5. rubber content: 28%,35 ...