Key Aspects: Advantages and Mechanisms of TPE in Overmolding Processes
Time of issue:2024-03-29
**(I) Major Advantages of TPE in Overmolding Applications**
1. TPE elastomer soft compounds are used in secondary injection molding processes, specifically for overmolding. Due to their excellent slip resistance and favorable elastic feel, TPE materials enhance the tactile sensation of the product and improve its grip.
2. TPE elastomer soft compounds can be adjusted to the appropriate hardness range (with a hardness scale from Shore 25 to 90A) and customized to have suitable physical properties (such as wear resistance, adhesion properties, melt index, etc.). This versatility offers a variety of material solutions for different product applications.
3. TPE is processed via overmolding techniques for products like handles, grips, and electronic components. The material provides a comfortable touch sensation, improves grip, enhances the aesthetics of the product, and increases its value-added attributes. Most of these products are exported to developed countries and regions such as the United States, Japan, and the EU. Since TPE elastomer soft compounds are eco-friendly raw materials that do not contain phthalates, halogens, and comply with ROHS environmental testing standards, they fully meet the stringent environmental requirements of the United States, Japan, the European Union, and other developed countries and regions.
**(II) Principal Mechanisms of TPE Overmolding**
TPE overmolding can be divided into true bonding and pseudo bonding. True bonding leverages the compatibility between the soft and hard materials during their softened or melted state. This compatibility, primarily determined by the materials' solubility parameter (SP), where closer SP values indicate better compatibility, allows for the formation of an adhesive layer at the interface between the hard and soft materials, significantly improving the bonding of TPE soft compounds to rigid plastics. Conversely, pseudo bonding does not heavily rely on material compatibility. Instead, the bonding of the soft and hard materials is achieved through mechanical forces, mold and product design, and surface treatments that enable a clamping or interlocking effect, allowing the soft and hard materials to join together.
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