The cause of bubble on the surface of rubber products and its solution

Rubber products are widely used in modern industry and daily life, and their excellent elasticity, wear resistance and aging resistance make them an important part of many key equipment and consumer goods. However, in the production process or after use, the surface of rubber products often appear bubbles (also known as pores or bubble defects), which not only affects the beauty of the product, but also may lead to performance degradation or even failure. This paper will deeply discuss the causes of bubbles on the surface of rubber products, and put forward the corresponding solutions.

The cause of bubbles on the surface of rubber products

Raw material problem

Moisture content: Excessive moisture content in rubber materials can lead to bubbles during the vulcanization process. Water evaporates at high temperatures to form steam, and steam cannot be discharged in time to form surface bubbles.

Impurities: Impurities mixed in the rubber material, such as metal particles, fibers, etc., may react with the rubber material during the vulcanization process to produce gas to form bubbles.

Process problem

Uneven mixing: uneven mixing of rubber materials with vulcanizing agents and fillers may lead to incomplete local vulcanization and bubbles.

Improper control of vulcanization temperature and time: too high vulcanization temperature or too long vulcanization time may lead to excessive vulcanization of rubber materials and produce bubbles. The vulcanization temperature is too low or the vulcanization time is insufficient, which may lead to incomplete vulcanization and also produce bubbles.

Insufficient pressure: The pressure in the vulcanization process is insufficient, and the gas in the rubber material cannot be completely discharged, resulting in the formation of bubbles.

Mold problem

Unreasonable mold design: Unreasonable mold design, such as insufficient exhaust holes or improper location, resulting in the gas generated in the vulcanization process can not be discharged in time.

Mold cleanliness is not enough: there is oil, rust or other pollutants on the surface of the mold, which may react with the rubber material during the vulcanization process to produce bubbles.

Environmental factor

Environmental humidity: High humidity in the production environment may cause the rubber material to absorb water during processing and produce bubbles.

Ambient temperature: too high or too low ambient temperature may affect the vulcanization process of rubber materials, resulting in the generation of bubbles.

solution

Raw material handling

Drying treatment: The rubber raw materials are fully dried to ensure that the moisture content is less than 1%. It can be dried using a vacuum dryer or a hot air circulation dryer.

Cleaning treatment: Clean the rubber raw materials to remove impurities and pollutants. Equipment such as screens and magnetic separators can be used for cleaning.

Optimized processing technology

Uniform mixing: To ensure that rubber materials are evenly mixed with vulcanizing agents, fillers, etc., efficient mixing equipment and accurate metering systems can be used.

Reasonable control of vulcanization temperature and time: according to the characteristics of rubber materials and product requirements, reasonable setting of vulcanization temperature and time to avoid excessive vulcanization or incomplete vulcanization. Precise control is possible using temperature control systems and time control systems.

Appropriate increase of pressure: in the vulcanization process, the appropriate increase of pressure to ensure that the gas in the rubber material is completely discharged. Vulcanization can be done using a hydraulic press or a vacuum vulcanizer.

Optimize mold design

Reasonable design of exhaust holes: Set the exhaust holes reasonably in the mold design to ensure that the gas generated during the vulcanization process can be discharged in time. The position of the vent should be reasonably distributed to avoid gas accumulation.

Improve the cleanliness of the mold: clean and maintain the mold regularly to ensure that the surface of the mold is free of oil, rust and other pollutants. Cleaning can be done using cleaning agents and ultrasonic cleaning equipment.

Control environmental factors

Control the ambient humidity: Install dehumidification devices in the production environment to control the ambient humidity within a reasonable range. Control can be achieved using dehumidifiers and humidity monitoring equipment.

Control the ambient temperature: Install air conditioners or heating equipment in the production environment to control the ambient temperature within a reasonable range. It can be controlled using temperature control systems and thermostats.

conclusion

The generation of bubbles on the surface of rubber products is a multi-factor problem, involving raw materials, processing technology, mold design and environmental factors. By optimizing raw material treatment, processing technology, mold design and environmental control, the surface bubbles of rubber products can be effectively reduced and eliminated, and product quality and reliability can be improved.

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