In the process of producing and processing TPE materials, due to various reasons, many friends will encounter poor tear strength of TPE materials, which will undoubtedly cause inconvenience to our use and affect the use. So do you know what's going on with the poor tear strength of TPE materials? And how can it be improved? Here's what you know:
Causes and improvement methods of poor tear strength of TPE materials:
First, the problem of TPE material compounding system.
Cause analysis: the type of rubber substrate, the proportion of plastic, the content of oil, etc., will affect the tear strength of the compounded TPE material.
Improvement methods: 1. Select TPE materials with high molecular weight and star structure SEBS substrate.
2. If the physical properties of TPE materials allow, appropriately increase the proportion of plastic components (such as PP, PS, LLDPE).
3. On the premise of ensuring physical properties, appropriately reduce the amount of oil added.
4. Appropriately reduce the amount of inorganic filling powder such as calcium carbonate.
2. The TPE material is degraded or the performance of the material is reduced after multiple uses.
Reason analysis: The higher the molding temperature of TPE material, the more times of processing, the physical properties of the material, including tear strength, will gradually deteriorate.
Improvement method: Understand the molding characteristics of TPE materials and adopt appropriate processing temperatures. When using secondary materials, pay attention to controlling the proportion of secondary materials (generally the amount of secondary materials should not exceed 25%)
3. Stress defects.
Cause analysis: There are sharp inner edges or edges and corners in TPE products, and there are stress gaps, which can easily lead to stress concentration. When encountering external tensile tearing, product tearing mostly starts from these positions.
Improvement method: Try to avoid sharp or abrupt corners in the design of TPE material products and molds, and try to design arcs at the corners to reduce stress defects.
In summary, this is the cause of the poor tear strength of TPE materials and how to improve it. If you encounter the poor tear strength of TPE materials, you can analyze the causes and solve them according to the above. If we still can't solve the problem through the above methods, please contact Mesculo, and we will arrange professional technicians to provide you with detailed answers.