How to avoid bubbles and voids during the silicone encapsulation process?

To avoid bubbles and voids during the silicone encapsulation process, the following measures can be taken:
1、 Material preparation and processing
Vacuum defoaming: Before injection, a vacuum machine is used to vacuum defoam liquid silicone gel to remove air and dissolved gases from the gel.
The vacuum degassing time should be long enough, generally recommended 60-80 minutes, to ensure that the bubbles in the silicone are fully removed.
Material selection: Choose silicone materials with low viscosity and easy flowability, which can help reduce the generation of bubbles.
Ensure stable quality of silicone materials and avoid using expired or substandard silicone.
2、 Production process optimization
Glue injection speed control: Slowly and evenly inject glue to avoid the formation of bubbles during rapid injection.
The injection speed can be controlled by adjusting the injection speed and pressure of the injection molding machine.
Mold design: The mold design should be reasonable to ensure that the silicone can fully fill every corner of the mold.
Install exhaust holes on the mold to expel air bubbles during the glue injection process.
Curing conditions: Accurately control the curing temperature and time of silicone to ensure complete curing of the silicone.
Avoid excessive temperature fluctuations during the curing process to reduce the generation of bubbles.

3、 Mold and equipment maintenance
Mold cleaning: Before each production, clean the surface of the mold to remove dirt, grease, and other impurities.
Use appropriate cleaning agents and tools for cleaning to avoid damage to the mold.
Equipment inspection: Regularly inspect injection molding machines and related equipment to ensure their normal operation.
Maintain and upkeep the equipment to avoid bubble problems caused by equipment malfunctions.
4、 Operating standards and training
Operating standards: Develop detailed operating procedures, clarify the operational requirements and precautions for each step.
Operators should strictly follow the procedures to avoid bubble problems caused by operational errors.
Training and Education: Provide training and education to operators to enhance their operational skills and quality awareness.
Regularly organize training and exchange activities, share experiences and lessons learned, and jointly improve product quality.
In summary, through measures such as material preparation and processing, production process optimization, mold and equipment maintenance, as well as operational norms and training, the problems of bubbles and voids during the silicone encapsulation process can be effectively avoided. The implementation of these measures requires the joint efforts and cooperation of all employees to ensure the stability and reliability of product quality.