What should I pay attention to in TPE overmolding materials?
Time of issue:2023-08-14
TPE thermoplastic elastomer is an important application area - overmolded hard plastic junction components, usually we see the most TPE overmolded ABS, TPE overmolded PP, like the market we see the most is the toothbrush handle TPE overmolded, to play a non-slip, soft-touch efficacy.TPE overmolded secondary injection molding process need to pay attention to some of the following parameters:
1, the compatibility of TPE materials and hard glue components need to match, molecular solubility is close to the molecular compatibility is better;.
2, in the design need to try to avoid sharp corners to ensure that the TPE and hard rubber contact excellent, enhance the bonding effect.
3, through the appropriate exhaust to avoid leaving gas in the mold cavity.
4, so that the thickness of the TPE overlay and the expected sense of touch to achieve a balance.
5、Maintain the temperature of the TPE material melt to ensure the bonding effect.
6, TPE material overlay molding need to bake material reprocessing, in order to reduce the product surface water lines, to obtain the effect of surface color uniformity.
7, the choice of masterbatch and its carrier resin and TPE overmolding and structural components are compatible with the material.
8, for the smooth surface should be special treatment, the purpose is to increase the soft glue and hard glue adhesive contact surface, strengthen the bonding effect;.
9, TPE material should have good fluidity, because the TPE overlay thickness and size ratio is very small, TPE usually need to flow through a longer path and thin-walled area to fill the mold.
10, TPE adhesive flow length / product thickness ratio of less than 150:1
11、Adopt good adhesive.
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