**Reasons for Vibration in Injection Molded Products – Analysis and Solutions**
Phone: 13711965595
In injection molded parts made from polystyrene (PS) and other rigid plastics, surface vibrations or wavy patterns often appear near the gate. These patterns are typically centered around the gate and are sometimes referred to as "shock patterns." The main cause of this issue is when the melt viscosity is too high, leading to a stagnant filling process. As the front part of the molten material comes into contact with the cavity wall, it cools and contracts rapidly. The subsequent flow of molten material then expands against this cold, contracted area, creating an alternating expansion and contraction effect. This continuous cycle leads to the formation of surface grain-like structures that move in the direction of the flow.
**Solutions to Reduce Surface Vibration:**
(1) **Increase the barrel and nozzle temperature**, as well as the mold temperature. This helps reduce the melt viscosity and improves the flowability of the material, allowing it to fill the mold more smoothly.
(2) **Raise the injection pressure and speed** to ensure the mold cavity is filled quickly and uniformly. This prevents the formation of stagnant flow areas and reduces the chances of surface defects.
By adjusting these parameters, manufacturers can significantly improve the quality of injection-molded parts and minimize the occurrence of surface vibration issues.
For more information on injection molding techniques and troubleshooting, visit [http://news.chinawj.com.cn](http://news.chinawj.com.cn).
Editor: Hardware Business Network Information Center
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