What should be paid attention to in liquid silicone injection molding?
Liquid silicone injection molding is a high-precision and high-quality plastic manufacturing process, and its products are widely used in medical, aerospace, automotive and electronics fields. In terms of molding, the following points need to be paid attention to:
temperature control:
The curing of liquid silicone is closely related to temperature, so it is necessary to accurately control the heating and cooling system of the injection molding machine. The heating system of the injection molding machine needs to determine the heating temperature according to the characteristics of the silicone and the shape of the product to ensure that the silicone can flow into the mold and fully fill the mold. The role of the cooling system is to make the silicone solidify quickly, so that the product can be demoulded quickly and the quality of the product is guaranteed.
Pressure control:
The pressure of the injection molding machine needs to be determined according to the characteristics of the silicone and the shape of the product. If the pressure of the injection molding machine is too high, it may cause problems such as silicone bubbles in the mold, warping or uneven shrinkage. If the pressure is too small, it may cause the silicone to not fully fill the mold, thus affecting the quality of the product.
Mold design:
Mold design needs to take into account the fluidity and shrinkage of silicone. The fluidity of silicone is worse than that of ordinary plastics, so it is necessary to design a suitable flow channel and glue outlet to ensure that the silicone can fully fill the mold. In addition, the shrinkage rate of silicone is larger than that of general plastics, so this needs to be taken into account in the mold design to ensure that the size and shape of the product meet the requirements.
Auxiliary equipment:
In order to improve production efficiency and quality, it needs to be equipped with various auxiliary equipment, such as automatic feeder, temperature control system, cooling system, etc. The automatic feeder can automatically add silicone into the injection molding machine, reducing manual intervention and improving production efficiency. The temperature control system and cooling system can help control the temperature and curing speed of silicone, improve the quality and stability of the product.
Process control:
Strict process control is required for each link of the process to ensure the quality and stability of the product. For example, it is necessary to regularly check the temperature and pressure of the injection molding machine, check the wear of the mold, check the fluidity and curing speed of the silicone, etc. In addition, a complete recording system needs to be established to record the process parameters and product quality of each production batch for later traceability and improvement.
