Automobile sealing strip production process
Automotive rubber seals are extruded using a cold feed extruder with a single head, composite (double composite and multi-composite) head and shear head. Among them, the screw length to diameter ratio of the microwave vulcanizing extruder is generally 16, and the screw length to diameter ratio of the shear head vulcanizing extruder is greater than 20.
The semi-finished rubber sealing strip extruded by the cold feed extruder is vulcanized by continuous vulcanization. The vulcanization methods include microwave vulcanization, shear head vulcanization, salt bath vulcanization and fluidized bed vulcanization (also known as vulcanized bed vulcanization. The heating medium is 0.1%). -0.2 mm glass beads, temperature 250 ° C), hot air vulcanization (for silicone rubber seals only) and high speed hot air vulcanization (air flow rate 120 km·h-1, temperature 400 ° C). High-speed hot air vulcanization is slow due to heat transfer rate and high energy consumption of heating equipment (three times that of microwave vulcanization heating equipment and five times that of shear head vulcanization equipment).