1. Internal mixing process
Internal mixing is to mix carbon black, natural rubber or synthetic rubber, oil, additives, accelerators and other raw materials together and process them in an internal mixer to produce rubber. Some people describe this process as the dough link in cooking.
2. Preparation process of rubber parts
In this link, it generally takes six steps to complete all the semi-finished rubber parts that make up the tire.
(1) Section I: extrusion
The rubber is added to the extruder head to extrude different semi-finished rubber parts, such as tread, sidewall, triangular rubber strip, etc.
(2) Section II: Rolling
The raw material cord passes through the calender, and a thin layer of rubber is hung on both sides of the cord, and finally processed into cord fabric. The raw material cord mainly uses nylon and polyester.
(3) Section III: bead forming
The bead is formed by winding many steel wires after hanging glue. The compound used for bead has certain special properties. After vulcanization, the compound and steel wire can be closely bonded together.