Silicone secondary injection molding process
Silicone secondary injection molding process
Silicone over-injection molding is a common process in the manufacturing process of silicone products. It allows the silicone products to be injection molded again after they are formed to process more complex or functional products. The following is the general process flow of silicone secondary injection molding:
1. Prepare silicone products: First, prepare the formed silicone products. These articles may have been previously made using liquid silicone injection molding or other processes.
2. Prepare injection molding materials: Select appropriate injection molding materials according to product design requirements. These materials are usually thermoplastics such as polypropylene (PP), polyethylene (PE), polycarbonate (PC), etc.
3. Mold design and preparation: Design and prepare molds for secondary injection molding. These molds should match the shape of the silicone product and have the required injection holes and structure.
4. Install silicone products: Install silicone products into the secondary injection mold. Typically, silicone products are fixed at specific locations on the mold to ensure accuracy and stability during the injection molding process.
5. Injection molding process: Heat the injection molding material to a suitable temperature and inject it into the mold around the silicone product through an injection molding machine. During the injection molding process, temperature, pressure and injection time need to be controlled to ensure that the injection material can fully fill the mold and bond well with the silicone product.
6. Cooling and solidification: After the injection molding material is fully filled in the mold, wait for a period of time to allow it to cool and solidify. This time will vary depending on the type and thickness of the injection molded material.
7. Demolding: After the injection molding material is completely solidified, carefully remove the finished product from the mold. This step needs to be done carefully to avoid damaging the finished product or mold.
8. Follow-up processing: Depending on the product requirements, some subsequent processing may be required, such as edge trimming, surface polishing, etc.
The key to silicone secondary injection molding lies in the design and preparation of the mold, as well as the control of the injection molding process. Only when these aspects are effectively managed and operated can high-quality silicone products be produced.
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