Processing Machinery
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PBT Refrigerant-Resistant Parts
Problem Phenomenon
PBT parts in the air-conditioning refrigeration system degrade in performance in the refrigerant environment, and small-molecule precipitation contaminates the system
Cause Analysis
The key to refrigerant-resistant PBT is reducing small-molecule precipitates; twin-screw processing parameters affect small-molecule generation; the SSP solid-state polycondensation process has an obvious effect on small-molecule removal
Solution
①Select dedicated refrigerant-resistant grades for refrigerant-contact parts; ②Verify by refrigerant immersion; ③Prefer SSP process grades; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Refrigerant-resistant PBT is the ultimate requirement of small-molecule control; dual control of formulation and process is indispensable; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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