Analysis of the causes of swelling and bubbling of injection molded products
Some plastic components may swell or develop bubbles shortly after being removed from the mold, especially on the back of metal inserts or in areas with thick walls. This issue is typically caused by trapped gas within the molten plastic that hasn’t fully cooled and solidified. As the material cools, the gas expands, leading to surface defects. To address this problem, consider the following solutions: 1. **Improve Cooling Efficiency**: Lower the mold temperature, increase the cooling time, and adjust the drying and processing temperatures of the material to ensure proper solidification. 2. **Adjust Filling Speed**: Slow down the injection speed to reduce air entrapment and improve flow distribution. Also, optimize the molding cycle to minimize pressure loss. 3. **Increase Holding Pressure and Time**: Extend the holding phase to allow more uniform packing and reduce internal voids. 4. **Optimize Part Design**: Avoid sharp thickness changes or excessively thick sections. Ensure even wall thickness to promote consistent cooling and prevent localized swelling. By implementing these strategies, manufacturers can significantly reduce the occurrence of swelling and bubbling in injection molded parts. For more detailed guidance or technical support, feel free to contact us. Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
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