Injection Molding
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PBT injection speed management
Problem Phenomenon
Speed-related defects.
Cause Analysis
Excessive speed causes shear overheating; too slow causes front freezing.; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry data and should be confirmed first when troubleshooting
Solution
①Multi-stage speed curve; ②initial stage to prevent jetting; ③middle stage filling; ④final stage to prevent overfilling.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The speed curve is optimized by stage.; after confirming effectiveness, solidify 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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