Material Drying
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PCABS Bubbles
Problem Phenomenon
[Problem Phenomenon] PC/ABS products have internal bubbles, and strength is affected
Cause Analysis
Three categories: moisture vaporization, thermal degradation gas production, and thick-wall shrinkage voids; moisture type is overall, degradation type is accompanied by discoloration, and shrinkage void type is concentrated in thick walls; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Classify and locate according to bubble distribution; treat accordingly with drying/temperature reduction/holding pressure; verify thick-walled parts by sectioning; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
PC/ABS bubbles are divided into three categories, and the distribution points to the cause; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar problems in the future
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