As a professional injection mold manufacturer, JS Precision Company is committed to delivering top-quality products with high precision and fast delivery. One of the most common issues faced in injection molding is jetting. Jetting is a visible defect that occurs when molten plastic is forcefully ejected from the nozzle, resulting in a visible mark on the finished product. In this article, we will discuss what causes jetting and how it can be avoided.
What causes jetting?
Jetting occurs due to various factors such as high injection speed, high viscosity of the plastic, gate location, and gate size. When the velocity of the molten plastic is too high, it causes turbulence in the flow, leading to air entrapment and ultimately resulting in jetting. Similarly, the viscosity of the plastic also plays a crucial role in determining the occurrence of jetting. If the viscosity is too high, it can cause resistance to flow, leading to jetting.
Moreover, the location and size of the gate can also contribute to jetting. If the gate is too small, it can cause high pressure, leading to jetting. Similarly, if the gate is located in a position where air can easily be trapped, it will result in jetting.
How to avoid jetting?
There are several ways to avoid jetting in injection molding. Here are some of the most effective methods:
1. Reduce injection speed: As mentioned earlier, high injection speed can cause jetting. Therefore, reducing the injection speed can help in avoiding jetting.
2. Optimize gate location and size: The location and size of the gate play a crucial role in determining the occurrence of jetting. Therefore, it is important to optimize the gate location and size based on the mold design.
3. Improve venting: Proper venting can help in avoiding air entrapment, which is one of the main causes of jetting. Therefore, it is essential to ensure that the mold has sufficient vents for proper air evacuation.
4. Use mold release agents: Mold release agents can help in reducing the viscosity of the plastic, making it easier to flow, and thus reducing the occurrence of jetting.
5. Adjust temperature: Temperature plays a crucial role in injection molding. Therefore, adjusting the temperature of the mold and the plastic can help in avoiding jetting.
Conclusion:
Jetting is a common issue faced in injection molding, but it can be avoided by taking the necessary precautions. As a professional injection mold manufacturer, JS Precision Company is committed to delivering top-quality products with high precision and fast delivery. By following the above-mentioned methods, we can ensure that our products are free from any visible defects such as jetting. If you have any questions or would like to know more about our products, please visit our website or contact us directly.