Flowability is an important physical processing parameter of polymer materials, and TPE is no exception. For example, the melt index of a TPE material is 3.5g/10min (5kg, 190℃), which means that at a melt temperature of 190℃, a melt index tester with a pressure of 5kg, after 10 minutes of testing, a total of 3.5 Fluid volume. Obviously, the larger the MI value, the better the fluidity of TPE!

　　TPE is a blended polymer material, the molecular weight Mr size of the elastomer phase in the system, the MI of the reinforcing plastic phase, and the amount of other fillers added will have a large impact on the flow of TPE. As for more in-depth analysis, that is a matter of technical engineers, plastic uncle here inconvenient to discuss in detail, so as not to mislead readers!

　　In actual engineering cases, the design of the mold and runner, the hardness of the material, the size of the product, the complexity of the structure and thickness, etc. all affect the choice of TPE material fluidity.

　　During the production process, by increasing the injection temperature and injection pressure, the processing difficulties caused by the lack of fluidity can be compensated to a certain extent, but it may lead to defects such as flow lines and phi-fronts in the products! The injection temperature should not be too high, otherwise it may lead to partial degradation of the material and degradation of physical properties. Suitable injection temperature, you can look at the end of the normal injection of molten material before the end of the transfer of the appearance of the injection, if the transparent fluid, it means OK, in addition from the appearance of the water mouth can also determine whether the injection temperature is appropriate!

　　In short: to adjust the fluidity of TPE, one from the formulation, the second is to adjust the processing technology!

　　When choosing TPE materials, in most cases, fluidity is not particularly important consideration, generally experienced engineers can be based on the customer's product mold design and product structure size, to give a general fluidity suitable for TPE, TPR materials, and then through appropriate adjustment of injection temperature and pressure and other process parameters, basically can make the production and processing easy.