11 elements to be noted for TPE overmolding
Time of issue:2023-06-19
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.
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