What are the reasons that affect the deformation and shrinkage of liquid silicone encapsulated products?

Liquid silicone encapsulated products may experience deformation or shrinkage during the production process, which usually affects the dimensional accuracy and appearance quality of the product. The following are some possible reasons that may cause deformation or shrinkage of liquid silicone encapsulated products:

Material characteristics: Different silicone materials have different physical and chemical properties, such as melting point, viscosity, etc., which may affect the shape of the formed product.

Temperature control: If the temperature during injection molding is too high or too low, it may cause deformation of the product during cooling.

Improper pressure: Excessive or insufficient injection pressure can affect the fluidity and filling of silicone gel, leading to product defects.

Mold design: Unreasonable geometric shape, size, and cooling system design of the mold can also lead to product quality issues after molding.

Sulfurization process: Insufficient or excessive vulcanization can cause changes in the shrinkage rate of the product, resulting in deformation.

Demolding process: Improper operation during demolding may also cause deformation of the product, especially for products with complex shapes.

Insufficient curing time: An appropriate curing time is crucial to ensure that the silicone gel is completely cured and maintains a stable form. If the curing time is insufficient, it may cause deformation during later use.

Environmental conditions: Factors such as temperature and humidity in the production environment can also affect the performance of liquid silicone and the shape stability of the final product.

Uneven mixing of raw materials: If the raw materials are mixed unevenly during the preparation process, it may affect the flow and hardening performance of some areas, leading to local shrinkage or expansion inconsistency problems.

Operation skills and experience level: The technical level of operators has a direct impact on product quality. Inexperienced operators may not be able to accurately control injection molding parameters or fail to adjust in a timely manner to cope with changes in machine status

In addition to the above factors, there are also some other factors that can affect the deformation and shrinkage of liquid silicone encapsulated products. For example, insufficient curing time of silicone materials can lead to incomplete curing inside the product, thereby affecting the dimensional accuracy and stability of the product. In addition, the post-treatment process of the product can also have a certain impact on the forming effect of the product. For example, after solidification, products require post-treatment processes such as cutting and polishing, and improper operation of these processes can also affect the dimensional accuracy and stability of the product.

In summary, there are various factors that affect the deformation and shrinkage of liquid silicone encapsulated products, including raw material factors, production process factors, mold design factors, environmental factors, and other factors. In order to improve the quality and stability of products, it is necessary to comprehensively consider the impact of these factors and take corresponding measures to control and optimize them. During the production process, it is necessary to strictly control various process parameters and raw material quality to ensure the molding quality and stability of the product. At the same time, it is necessary to continuously optimize mold design and post-processing technology to improve the dimensional accuracy and stability of the product.