Why is the hardness of TPE material soft after making the finished product?

In the production of TPE products, there are often cases where the raw material meets the expectation but the hardness of the finished product is soft, which affects the assembly and use effect. This hardness distortion phenomenon not only affects product quality, but also may lead to the whole batch of products scrapped, resulting in serious losses. So, what is the reason for the soft hardness of TPE raw material after making the finished product?

First of all, TPE raw materials made of finished products this problem is not caused by a single factor, need to be investigated from a variety of links, the specific reasons to see.

First, the impact of the material itself

Raw material batch differences may bring fluctuations in hardness, if the warehouse management improper mixing of different hardness grades, will directly lead to the finished product hardness does not match. TPE particles are hygroscopic, injection molding before the full drying of moisture at high temperatures will affect the molding effect, so that the product is soft. In addition, the raw material mixed with impurities or softer plastics, will also reduce the overall hardness.

Second, the deviation of the production process

Melt temperature is too high will make the TPE molecular arrangement loose, cooling hardness decline. Insufficient injection pressure or holding pressure will lead to the products are not dense enough inside, showing a soft state. When the cooling time is not enough, the product is not completely shaped before demolding, the molecular chain is not stabilized, the hardness is naturally low.

Third, the mold and the impact of the test

Mold temperature is too high will slow down the cooling rate, similar to the effect of insufficient cooling time. Mold exhaust is not smooth will affect the local curing, may lead to uneven hardness or overall soft. If the products are not fully adjusted in the standard environment during the test, or if the hardness tester with poor condition is used, the data will be distorted and the hardness will be misjudged.

Therefore, the soft hardness of the finished TPE raw material is a complex problem of multi-factor coupling, and its solution requires a systematic thinking.

Therefore, troubleshooting TPE finished product hardness soft problem, according to the order of material verification, process inspection, mold status confirmation, test process specification step by step, you can find the key reasons for targeted adjustments, thereby improving product hardness performance. I hope the above zhongsu Wang editorial sharing can help you.