TPR and TPE are two commonly used thermoplastic elastomers that may encounter some defects during the injection molding process. Below are some common reasons for these defects and solutions:

If the injection speed is too fast, and the material retention time is too long, it can lead to a decrease in the product's surface luster.

Problem Solution: Reduce the injection speed and minimize the dwell time.

2. The material has poor thermal stability and is prone to thermal decomposition.

Solution: Utilize materials with excellent thermal stability and luster, or add thermal stabilizers to the material.

3. Low cylinder temperature and excessively low nozzle temperature can result in reduced surface luster of the product.

Problem Solution: Increase nozzle temperature to raise melt temperature.

4. Molding temperature too low, cooling speed too fast. As the melt is still filling, a hard shell forms on the cavity wall. The shell layer is subjected to various forces, causing it to become white and cloudy, thereby reducing the product. Surface luster

Solutions to the issue: Increase the mold surface temperature, decrease the cooling rate, or use local heating at the mold gate.

5. Poor mold surface finish results in a dull product surface.

The solution should be carbon steel, with the mold surface meticulously polished to enhance the surface finish.

Excessive release agent can also cause such defects on the product surface.

Solution Method: Minimize or use a small amount of release agent, and apply evenly.

7. When the back pressure is too low during the plasticizing process, the material is not plasticized evenly, leading to an uneven surface color of the product due to the mixture of the material and the coloring agent.

Solution to Issue: Increase back pressure appropriately.