Thermoplastic elastomer TPE encapsulated secondary injection molding processing parameters
An important application area for thermoplastic elastomers TPE/TPR: encapsulated hard rubber structural parts.
TPE rubberized secondary injection molding requires attention to the following parameters :
1, the compatibility of TPE/TPR with hard rubber structural parts should be matched, the molecular solubility is close, and the compatibility of molecules is better;
2, in the design, try to avoid sharp corners to ensure good contact between TPE and hard rubber parts, improve bonding effect;
3, through proper exhaust to avoid gas in the mold cavity;
4, to balance the thickness of the TPE/TPR with the expected touch;
5. Maintain the temperature of the TPE/TPR melt to ensure the bonding effect;
6, TPE Materials Overmolding needs to be baked Reprocessing, to reduce the water surface of the product, to obtain a uniform surface color;
7, the selected masterbatch is compatible with TPE/TPR and structural materials;
8. Special treatment for smooth surfaces, the purpose is to increase the bonding surface between soft rubber and hard rubber, and strengthen the bonding effect;
9, TPE/TPR should have good fluidity. Because the thickness and size ratio of TPE cladding layer is very small, TPE/TPR usually needs to flow through a long path and The thin wall area is filled into the mold.
10, TPE/TPR has a flow length/product thickness ratio of less than 150:1;
11. Use a good adhesive.
TPE/TPR encapsulated material has a soft and comfortable touch close to human skin, which is the essence of TPE/TPR application. By adjusting the process parameters in the process of optimizing the encapsulation process, it is believed that there will be more and more functional products of TPE materials to enhance and make up our lives.
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