**Reasons for Vibration in Injection Molded Products – Analysis Hotline: 13711965595**
Surface defects such as dense wrinkles centered around the gate, often referred to as "shock patterns," commonly appear on rigid plastic parts like polystyrene (PS) near the gate area. These patterns are typically caused by improper melt flow during the injection process. When the melt has a high viscosity and fills the mold in a stagnant manner, the front material cools rapidly upon contact with the cavity surface, causing it to shrink. The subsequent melt then expands into this cooled and contracted area, leading to continuous alternating movements. This process results in a grainy or wavy pattern on the surface of the part, moving in the direction of the melt flow.
To address this issue, several solutions can be applied:
1. **Increase the barrel and nozzle temperature**, as well as the mold temperature, to reduce melt viscosity and improve flowability.
2. **Raise the injection pressure and speed** to ensure the mold is filled more efficiently and uniformly, reducing the chances of uneven cooling and shrinkage.
By optimizing these parameters, the formation of shock patterns and surface irregularities can be significantly reduced, resulting in higher-quality injection-molded parts.
For more detailed technical support or assistance, feel free to contact our experts at 13711965595.
Source: [http://news.chinawj.com.cn](http://news.chinawj.com.cn)
Editor: Hardware Business Network Information Center
(Word count: 504)
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