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What problems should be paid attention to in TPE overmolding processing?

An important application field of TPE thermoplastic elastomers – encapsulated hard rubber structural parts, usually we see the most TPE encapsulated ABS, TPE encapsulated PP, and the most commonly seen on the market is the toothbrush handle TPE encapsulated, Play a non-slip, soft touch effect.

An important application field of TPE thermoplastic elastomers – encapsulated hard rubber structural parts, usually we see the most TPE encapsulated ABS, TPE encapsulated PP, and the most commonly seen on the market is the toothbrush handle TPE encapsulated, Play a non-slip, soft touch effect. The following parameters should be paid attention to in the TPE overmolding process:

1. The compatibility of TPE and hard plastic structural parts needs to be matched, and the molecular solubility is similar, and the molecular compatibility is better;

2. In the design, sharp corners should be avoided as much as possible to ensure good contact between TPE and hard plastic parts and improve the bonding effect;

3. Use proper exhaust to avoid gas remaining in the mold cavity;

4. Balance the thickness of TPE with the expected touch;

5. Maintain the temperature of the TPE melt to ensure the bonding effect;

6. The overmolding of TPE material needs to be baked and reprocessed to reduce the water marks on the surface of the product and obtain the effect of uniform surface color;

7. The selected color masterbatch and its carrier resin are compatible with TPE and structural materials;

8. Special treatment is required for the smooth surface, the purpose is to increase the bonding contact surface between the soft glue and the hard glue, and strengthen the bonding effect;

9. TPE should have good fluidity. Due to the small thickness to size ratio of the TPE coating, TPE usually needs to flow through a long path and thin-walled area to fill the mold.

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

11. Use a good adhesive.

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