An important application area of TPE thermoplastic elastomer material is overmolding/dual material injection, TPE overmolding/dual material injection needs to pay attention to some parameters as follows:

　　1 the compatibility of TPE and hard cemented components need to be matched, the molecular solubility is close to each other, the molecular compatibility is better;

　　2 Sharp corners need to be avoided in the design to ensure excellent contact between TPE and hard plastic parts and to enhance the bonding effect;

　　3 to avoid leaving gas in the mold cavity by suitable exhaust;

　　4 to balance the thickness of the TPE with the expected touch;

　　5 maintaining the temperature of the TPE melt to ensure the bonding effect

　　6 TPE material overmoulding needs to be baked and reprocessed in order to reduce the surface water lines of the products and obtain a uniform surface color;;

　　7 The carrier resin of the selected masterbatch is compatible with both TPE and structural part materials;

　　8 For the smooth surface to be specially treated, the purpose is to increase the contact surface of soft glue and hard glue adhesion, to strengthen the bonding effect;

　　9 TPE should have good flowability, because the thickness to size ratio of TPE cover layer is very small, TPE usually needs to flow through a long path and thin-walled area to fill the mold.

　　10 TPE flow length/product thickness ratio is less than 150:1;

　　11 Use good adhesives.