What are the defects of liquid silicone encapsulation? How to solve it?

The liquid silicone encapsulation process may encounter some defects in practical applications. Here are some common defects and their solutions:Common defects and solutions

Bubbles and voids:

Defect description: During the encapsulation process, bubbles or voids appear inside or on the surface of the silicone gel.
Solution: Vacuum defoaming: Perform vacuum defoaming treatment before injection to remove air from the silicone gel. Control the glue injection speed: Inject glue slowly and evenly to avoid the formation of bubbles during rapid injection. Choose the appropriate silicone: use low viscosity, easy to flow silicone material.

Poor adhesion:

Defect description: The adhesion between silicone and substrate (such as metal, plastic) is insufficient, making it easy to peel off.
Solution: Surface treatment: Polish, clean or use primer on the surface of the substrate to increase surface roughness and activity. Choose the appropriate silicone: Use silicone materials with good adhesion properties. Control vulcanization conditions: Ensure appropriate vulcanization temperature and time to enhance adhesion.

Inconsistent size:

Defect description: The size of the encapsulated product is inconsistent with the design requirements, and may be too large or too small.
Solution: Precise control of the mold: Ensure accurate mold size, regularly inspect and maintain the mold. Control the amount of glue injected: Accurately control the amount of glue injected each time to avoid too much or too little. Optimize vulcanization process: Ensure stable vulcanization process and avoid size changes caused by uneven vulcanization.

Surface defects:

Defect description: There are defects on the surface of the encapsulated product, such as scratches, unevenness, flow marks, etc.
Solution: Optimize the gluing process: Ensure a smooth gluing process and avoid the formation of flow marks or scratches. Mold surface treatment: Ensure a smooth mold surface, regularly clean and maintain the mold. Control vulcanization conditions: Ensure appropriate vulcanization temperature and time to avoid surface defects caused by uneven vulcanization.

Silicone discoloration or deterioration:

Defect description: Silicone gel may discolor or deteriorate during vulcanization or use.
Solution: Choose the appropriate silicone: Use silicone materials with good high temperature resistance and aging resistance. Control vulcanization conditions: Ensure that the vulcanization temperature and time are appropriate to avoid excessive temperature that may cause silicone gel to deteriorate. Storage conditions: Ensure that the silicone material is stored in a dry and cool environment, avoiding direct sunlight and high temperatures.

Poor fluidity of silicone gel:

Defect description: Silicone has poor fluidity during the injection process, making it difficult to fill the mold.
Solution: Choose low viscosity silicone: Use silicone material with good fluidity. Heating silicone: Heat the silicone appropriately before injection to reduce its viscosity. Optimize the glue injection equipment: Ensure that the glue injection equipment works properly, with appropriate pressure and speed.

summary

The defects of liquid silicone encapsulation technology mainly focus on bubbles, poor adhesion, inconsistent size, surface defects, discoloration or deterioration of silicone, and poor fluidity of silicone. The key to solving these defects lies in optimizing process parameters, selecting suitable materials, precise control of molds and equipment, and regular maintenance and inspection.
If you encounter specific problems or have specific needs in practical operation, please provide more details, and I will do my best to provide you with more detailed solutions.