Processing Machinery
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ASA and ABS mixing failure
Problem Phenomenon
After switching between the ASA production line and ABS on shared equipment, the product shows performance fluctuations and appearance abnormalities, and the customer weathering test failure rate rises.
Cause Analysis
ASA and ABS have similar structures but different rubber phases; cross-mixing changes material weathering and mechanical properties; equipment residue and raw material misfeeding are the main mixing routes; difficulty in visual distinction increases management difficulty.
Solution
①ASA and ABS raw materials stored in separate zones with identification management; ②fully clean and replace when changing materials; ③perform weathering-related performance sampling on the first batch after switching; ④establish a material change checklist system for shared equipment.
Key Takeaway
The similarity of ASA and ABS is a hotbed for mixing accidents; when visual distinction is impossible, management error-proofing must be relied upon; weathering performance sampling is the last line of defense.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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