The Process Of Secondary Vulcanization Of Rubber Sealing Rings

The secondary vulcanization process of rubber sealing rings mainly includes steps such as preparation, temperature setting, heating, insulation, cooling, and removal inspection. The following is a detailed process description:
1, Preparation stage
Cleaning and treatment: Clean and treat the initially vulcanized rubber sealing ring to remove surface impurities and dirt, ensuring that the rubber sealing ring can be uniformly heated during the vulcanization process.
Loading into vulcanization mold: Load the processed rubber sealing ring into the vulcanization mold, ensuring that the sealing ring is in the correct position in the mold and avoiding deformation during the vulcanization process.
2, Set temperature
Set the temperature for secondary vulcanization based on the material and performance requirements of the rubber sealing ring. Usually, the temperature for secondary vulcanization is slightly higher than that for primary vulcanization, but it needs to be within the range that the rubber sealing ring can withstand. The choice of temperature is crucial for the degree of vulcanization and product quality.
3, Heating stage
Place the vulcanization mold and rubber sealing ring into an oven or vulcanization tank and heat them to the set temperature. During the heating process, it is necessary to ensure uniform temperature distribution to avoid local overheating that may cause deformation or damage to the rubber sealing ring. At the same time, the heating speed also needs to be controlled within a certain range to avoid adverse effects on the vulcanization effect caused by too fast or too slow heating speed.
4, Insulation stage
Maintain at the set temperature for a period of time, usually a few hours, to ensure that the vulcanization reaction is fully carried out. During the insulation process, it is necessary to continuously monitor the temperature to ensure that it remains within the set range. At the same time, it is also necessary to observe the changes in the rubber sealing ring and promptly detect and handle any abnormal situations.
5, Cooling stage
After vulcanization, gradually lower the temperature to allow the rubber seal ring to slowly cool to room temperature. During the cooling process, it is necessary to avoid sudden temperature changes that may cause internal stress or deformation in the rubber sealing ring. Usually, the cooling rate should be controlled within a certain range to ensure that the rubber sealing ring can smoothly transition to room temperature.
6, Extraction and Inspection
Remove the product: Remove the cooled rubber sealing ring from the vulcanization mold and oven or vulcanization tank.
Quality inspection: Conduct physical and chemical performance tests on rubber sealing rings to ensure that the secondary vulcanization effect meets expectations. The inspection content includes hardness, tensile strength, resilience, dimensional stability, etc.
7, Precautions
Temperature and time control: The temperature and time for secondary vulcanization need to be adjusted according to the material and performance requirements of the rubber sealing ring. Excessive temperature or prolonged time may damage the performance of rubber and requires strict control.
Uniform heating: During the secondary vulcanization process, it is necessary to ensure that the rubber sealing ring is uniformly heated to avoid local overheating that may cause a decrease in product performance or damage.
Equipment maintenance: Regularly maintain and upkeep the vulcanization equipment to ensure that it is in good condition, improve vulcanization efficiency and product quality.
The secondary vulcanization process of rubber sealing rings is a complex and delicate process that requires strict control of parameters and conditions in each link to ensure that product quality and performance meet expected requirements.