Step 1. Mixing Process
The ‘mixing Process’ involves adding and mixing various chemicals to crude rubber according to the characteristics and intended use of each tyre. Rubber sheets are created by adding plasticity to rubber so that its shape does not change easily.
Step 2. Extrusion Process
Once rubber sheets are made according to the characteristics of each part of the tyre through the ‘mixing Process,’ rubber is then created into a certain regular width and thickness through the ‘extrusion process.’ Here, the treads (outer surface of the tyre) and sidewalls (sides of the tyre) are created, which is an important process for cozy and comfortable driving.
Step 3. Calendering Process
The ‘calendering Process’ involves evenly applying and thinly topping a certain thickness of rubber sheets created in the ‘mixing Process’ on both sides of steel cords and fabric cords. Rubber is coated on the front and back by pushing steel cords and fabric cords through the constantly rolling rollers. Tyres can endure the car weight and maintain a certain form due to this ‘calendering Process’ (cords).
Step 4. Bead Process
The ‘bead process’ is the process of coating steel wires with rubber multiple times in a certain thickness, and attaching filler rubber here. Beads fix the rubber of the tyres to the wheels, serving as the frame of tyre rims and thus making the tyres stronger if there are more beads.
Step 5. Building Process
Now, there is the ‘building Process’ in which cylindrical green tyres are made by consecutively attaching all components and materials used in tyres to the molding press. This ‘building Process’ requires a great of attention since it determines the quality of the tyres. Radial tyres used in automobiles first require the process of attaching the ‘carcass’ (the frame of the tyre located inside the tread), ‘beads’ (the frame fixed on the rim of wheels), and ‘sidewalls.’ Then, they are transferred to the secondary molding press to complete tyres by attaching belts and treads.
Step 6. Curing Process
The ‘curing process’ involves adding heat and pressure inside and outside by putting tyres made of flexible rubber in a fixed mold. Sulfur and other chemicals react to rubber and create a unique design of NEXEN TYRE on the tread, and also apply elasticity to the rubber. Also, they provide any desired structure, shape, exterior, and mechanical/chemical characteristics.
Step 7. Test Process and Shipping
The ‘test process’ consists of five detailed tests.
First, there is the ‘visual test’ that inspects the exterior and interior of the tyre as well as the bead with the naked eye. Second, there is the testing of the tyre as a single product before assembling on the wheel, and also whether the tyre weight distribution is consistent in the circumferential direction (*direction of ultrasonic beam that is vertical to the main shaft of the cylindrical device) in the static state. Third, there is the ‘dynamic balance test’ that measures the weight uniformity in the circumferential direction after rotation when the tyres are assembled on the wheels and optimal air pressure is put into the tyres. Fourth, there is the ‘uniformity test’ that tests the uniformity of size and rigidity of the product. Finally, x-rays are used to test the carcass inside the tyres, structure of belts, and mixing of foreign matters, after which the manufactured products are automatically classified and shipped.