Rubber products in the production process, often encounter the problem of bubbles on the surface. These bubbles not only affect the beauty of the product, but also may have an adverse effect on the quality and performance of the product. Understanding the causes of bubbles on the surface of rubber products is of great significance for improving product quality and optimizing production process. The following are some of the main causes of bubbles on the surface of rubber products:
1. Rubber mixing is not uniform
Rubber mixing is a key link in the production of rubber products. If the operation is not standardized in the mixing process, such as unreasonable feeding sequence, insufficient mixing time or improper temperature control, it may lead to uneven dispersion of additives and fillers in the rubber, thus forming bubbles in the vulcanization process.
2. Ingredients contain moisture
During the storage, transportation and use of rubber materials, if moisture is not effectively eliminated, or due to weather changes, moisture may be mixed into the rubber. These moisture in the vulcanization process will evaporate to form bubbles, affecting the surface quality of the product.
3. The vulcanization process is not sufficient
Vulcanization is a key step in the molding of rubber products, which determines the physical and chemical properties of rubber. If the vulcanization time is not enough, the temperature is not enough, or the pressure is not up to standard, it may lead to insufficient cross-linking of the rubber, resulting in the formation of bubbles on the surface of the product. In addition, impurities in the vulcanization agent may also decompose during the vulcanization process to produce gas, further exacerbating the bubble problem.
4. Mold exhaust design is unreasonable
The exhaust design of mold is very important for the molding quality of rubber products. If the mold vent is improperly set or blocked, the gas generated by the rubber material in the mold filling process cannot be discharged in time, and bubbles will be formed on the surface of the product. In addition, the complex structure of the mold and the existence of dead angles may also lead to gas retention and the formation of bubbles.
5. The rubber material contains gas
In the rubber processing process, if the improper operation or poor sealing of the equipment, air or other gases may be wrapped in the rubber material. These gases can not be completely discharged during the vulcanization process, and bubbles will form on the surface of the product.
6. Formula problem
The formula design of rubber products directly affects the performance and quality of the products. If the proportion of additives and fillers used in the formula is improper or the selection is inappropriate, it may lead to bubbles in the vulcanization process of rubber. In addition, the lack of additives such as exhaust agents or moisture absorbers in the formulation may also exacerbate the bubble problem.
7. Insufficient vulcanization pressure
Vulcanization pressure is an important factor to ensure the compactness of rubber products. If the pressure is insufficient during the vulcanization process, there may be gaps or bubbles inside the rubber product. These bubbles cannot be eliminated after vulcanization, thus affecting the appearance and performance of the product.
8. Product thickness and shape
The thickness and shape of rubber products may also have an impact on the generation of bubbles. Thicker products have slower heat transfer during the vulcanization process, which may lead to incomplete vulcanization of the interior after the exterior vulcanization, resulting in bubbles. In addition, products with complex shapes are also more likely to produce gas retention and bubbles during the filling process.
solution
For the above reasons, the following measures can be taken to reduce or eliminate bubbles on the surface of rubber products:
Optimize rubber mixing process to ensure even mixing.
Strengthen raw material management to prevent moisture intrusion.
Strictly control vulcanization parameters to ensure full vulcanization.
Improve the mold design and set the vent reasonably.
Improve the operation standard and equipment sealing, prevent gas from being wrapped in rubber.
Optimize formula design, add appropriate amount of exhaust agent and moisture absorption agent.
Adjust vulcanization pressure and time to ensure product compactness.
Adjust the vulcanization process parameters according to the thickness and shape of the product.
Through the implementation of the above measures, the problem of bubbles on the surface of rubber products can be effectively reduced or eliminated, and the quality and performance of products can be improved.