Processing Machinery
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TPE barrel cleaning
Problem Phenomenon
After material change, products show color mixing and black specks; SBS and SEBS systems have different cleaning methods
Cause Analysis
TPE material change cleaning is graded by system: SBS systems are cleaned with PS, SEBS systems are cleaned with PE or PP; SBS has good thermal stability, and SEBS is even better and can be parked for 2 hours
Solution
①clean the barrel with PS for SBS systems; ②clean with PE or PP for SEBS systems; ③strengthen inspection of the first few shots after material change; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
TPE barrel cleaning selects materials by system; PS for SBS and PE/PP for SEBS, which must not be mixed; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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