Rubber Manufacturing Process Starts from Raw Material Mixing to Rubber Molding
Raw Material Mixing
The first step in rubber molding is raw material mixing. Commonly used materials include natural rubber, fluoroelastomer, silicone rubber, and more. Based on the needs for customized rubber coating, rubber materials are mixed with various additives (such as vulcanizing agents, antioxidants, etc.) to modify their physical and chemical properties, enhancing heat resistance, oil resistance, abrasion resistance, or other specific performance characteristics.
Mixing Process
In a mixing machine, the rubber materials and additives are thoroughly combined. This process requires precise control of temperature and pressure to ensure uniformity and stability of the rubber compound. After mixing, the rubber is cut into appropriate sizes to facilitate subsequent molding operations.
Mold Design and Production
Molds are the key tools in rubber molding, directly determining the appearance and dimensional accuracy of the final product. Mold design must account for factors such as the flowability of the rubber, shrinkage rates, and the complexity of the product. Molds are typically made of steel and undergo precision machining to meet high-accuracy requirements.
Mold Maintenance
During use, molds may wear out over time. Therefore, regular maintenance and repairs are required to ensure consistent quality in the produced rubber products.
Rubber Molding Techniques
Molding involves injecting the mixed rubber into a mold and forming it under high pressure into a specific shape. Rubber molding techniques vary based on different product requirements.
- Compression Molding: Compression molding involves placing pre-cut rubber into an open-close mold. Heat and pressure are applied, causing the rubber to flow and fill the mold. This method is suitable for producing simple-structured and large-volume products, such as gaskets and sealing rings.
- Injection Molding: Injection molding involves heating the rubber and quickly injecting it into the mold using an injection machine. This technique is suitable for mass-producing complex-shaped products, such as automotive parts. It is highly efficient and minimizes waste but comes with higher mold costs.
Vulcanization Process
Vulcanization is a critical step in rubber molding. Molded rubber undergoes chemical reactions with vulcanizing agents at high temperatures, making the rubber stronger, more durable, and highly elastic. The vulcanization process is usually carried out in specialized vulcanizing machines, with time and temperature strictly controlled.
Post-Processing and Inspection
After vulcanization, rubber products undergo further processes such as trimming, polishing, and inspection. Inspection includes dimensional measurements, appearance checks, and performance testing to ensure products meet customer requirements.
Quality Control
At SUN, international quality standards such as ISO 9001 and ISO 14001 are followed to ensure product stability and reliability. Through strict quality control and environmental management processes, the finished products gain a competitive edge in the market.
Outlook for the Rubber Molding Industry
With technological advancements, rubber molding techniques continue to innovate, improving manufacturing efficiency and achieving breakthroughs in environmentally friendly materials. In the future, as the electronics and automotive industries continue to grow, rubber molding technology will play a critical role in more fields.
