Material Drying
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ABS moisture absorption characteristics and drying necessity
Problem Phenomenon
[Problem phenomenon] ABS product surface silver streaks and water marks, misjudged as equipment or mold problems with repeated machine adjustment
Cause Analysis
ABS water absorption rate 0.2-0.8% is a hygroscopic material; residual moisture vaporizes into steam during 230-270°C processing, forming silver streaks on the product surface and weakening intermolecular bonding; this is the most common root cause of ABS defects
Solution
Dry at 80°C×3-4h before molding to moisture content ≤0.02%; dehumidifying dryer preferred; dried material goes directly from the dryer to the machine to prevent moisture regain; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Ninety percent of ABS silver streaks originate from moisture; 80°C×3-4h drying is an iron rule; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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