The silicone overmolding is used for secondary injection molding and the silicone overmolding is shot and glued. Because the liquid silicone rubber material has good anti-slip property and good elastic touch, it can improve the contact feel of the product and enhance the grip.
- The liquid silicone rubber overmolding can be adjusted to the appropriate hardness according to the physical properties of the product (hardness range Shore 25-90A), and appropriate physical properties (such as wear resistance, scratch resistance, adhesion, melt index, etc.). Various solutions are provided for different product requirements.
- Liquid silicone rubber is processed by overmolding and injection molding, and commonly used products such as handles, grips, electronic products, etc. The liquid silicone rubber material gives the product a comfortable touch, improves the grip, and improves the beauty of the product and the added value of the product. Most of the products are exported to developed countries and regions such as the United States, Japan and the European Union. Because liquid silicone rubber is a green high-quality raw material, the material does not contain phthalates, halogens, and 38 SVHC highly regarded substances stipulated by REACH. Comply with ROHS, REACH, NP, EN71, and PAHS safety testing standards, and can fully meet the safety requirements of developed countries and regions such as the United States, Japan, and the European Union.
- Processing technology of liquid silicone rubber overmolding,The liquid silicone rubber-encapsulated plastic generally adopts the secondary injection molding process. The hard plastic parts that have been beer (injected) are fixed on the overmolding mold, and then the liquid silicone rubber is injection-bonded to the plastic parts at a suitable temperature. The product is obtained by heating the mold. The injection temperature of the lagging varies according to the hard rubber material of the lagging. Due to the temperature, the suitability of the two materials, plastic and liquid silicone rubber should be considered. Raw materials such as PA and PC plastics can be processed by liquid silicone rubber encapsulation.
4. Common liquid silicone rubber overmolding problems
Lack of glue – the product is trapped in air, or the amount of glue shot is not enough.
Split seam, overflow – increase the clamping force and reduce the injection pressure;
Poor viscosity – choose the right adhesive and whether the plastic parts are clean
Product injection deformation – lower the molding temperature and use high temperature-resistant plastic materials.