Analyzing the Theoretical Model for Achieving Cohesive Overmolding with TPE
Time of issue:2024-09-14
Title: Analyzing the Theoretical Model for Achieving Cohesive Overmolding with TPE
From the theoretical model of TPE overmolding, achieving cohesive overmolding effect requires:
1. Polar matching, where the molecular chains of both materials can interpenetrate and dissolve into each other in their molten state.
2. Sufficiently high TPE melt temperature to ablate the surface of the hard plastic.
3. TPE surface tension lower than that of the hard plastic, allowing it to spread quickly over the hard plastic surface, thereby achieving ablation and mutual penetration of materials.
These three fundamental points essentially determine that the mutual compatibility and satisfaction of requirements between TPE and hard plastic formulations are the foundation for achieving an ideal cohesive effect.
From a commercial perspective, the best approach would be for both TPE and hard plastic to be produced by the same manufacturer who understands their own TPE and hard plastic formulations thoroughly. They can strictly adhere to the three key points of the theoretical model mentioned above in designing their formulations, avoiding any factors or materials in the formulation design that may hinder cohesion.
However, due to the specialized nature of TPE and hard plastic formulation design, and the fact that manufacturers of these materials usually focus on different primary business directions, it is often not possible to guarantee that the same manufacturer can provide mutually compatible TPE and hard plastic grades (formulations). Therefore, a secondary approach is for TPE manufacturers to test the cohesion effect of their developed TPE formulations with mainstream hard plastics available on the market, select compatible hard plastic grades, and recommend these together with their own TPE grades as an overmolding solution to customers.
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