Processing Machinery
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PBT product vacuum voids
Problem Phenomenon
Vacuum holes inside thick walls.
Cause Analysis
The surface layer solidifies first and internal feeding is interrupted; holding pressure cannot penetrate.; 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
①Core out thick areas; ②extend holding pressure; ③reduce mold temperature gradient; ④evaluate structural modification.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Vacuum voids are a structural feeding problem.; 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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