Causes and Prevention of Deformation in TPE Products
Time of issue:2024-10-23
Causes and Prevention of Deformation in TPE Products:
1. Deformation Occurring During Processing:
Due to the flexible nature of TPE (Thermoplastic Elastomer), during processes such as injection molding or extrusion, products may deform if they are forcibly removed from the mold while still too warm and not sufficiently cooled. Attention should be paid to the cooling of the mold and the proper ejection process to minimize deformation caused by pulling the products out.
2. Deformation Due to Improper Storage:
Some TPE products, especially those made from softer materials (0~50 Shore A hardness), can deform irreversibly under compression if they are stacked too high. Therefore, TPE products should not be stored in excessively tall stacks to prevent permanent deformation.
3. Deformation Caused by TPE Material Issues:
Inadequate melt strength of TPE materials, such as insufficient tensile strength, flexural resistance, resilience, and resistance to permanent deformation, can lead to the product deforming under applied force during use. Improving the melt strength of the material by addressing the base SEBS/SBS and balancing the ratios of other components can help solve this problem.
4. Deformation from Product Adhesion:
Some TPE products may become tacky on the surface (especially noticeable in summer), and improper storage can cause them to stick together, making them difficult to separate. Forcing them apart can lead to deformation. Although this falls into a different category of issues, adhesion of materials or products can indeed cause deformation. Adjusting the TPE/TPR formulation is a fundamental solution. As a temporary measure, wrapping the products in paper or film to prevent direct contact can help prevent sticking.
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