Material Drying
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PA12 Product Bubbles
Problem Phenomenon
Bubbles inside or on the surface of the product.
Cause Analysis
Moisture vaporization is the main cause; degradation gas generation or trapped air can also form them.; During on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based solely on experience; This mechanism has been repeatedly verified by industry data and should be confirmed first during troubleshooting
Solution
①Strengthen drying; ②control temperature to prevent degradation; ③improve venting; ④reduce speed to assist venting.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Identify bubbles into three categories: moisture, degradation, and trapped air.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; Include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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