Injection Molding
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PVC Injection Mold Sticking
Problem Phenomenon
Products stick to mold and get pulled damaged, demolding difficult.
Cause Analysis
High holding pressure, small draft angle, improper mold temperature; degraded material is more sticky and easier to stick; poor cavity polishing also aggravates; during on-site troubleshooting, verify item by item according to this mechanism, avoid blindly adjusting the machine based solely on experience.
Solution
①Appropriately reduce holding pressure to reduce clamping force and frozen internal stress; ②Increase demolding draft angle to reduce demolding resistance; ③Prevent degradation; ④Polish cavity; ⑤Extend cooling time, demold after products are fully set.
Key Takeaway
PVC mold sticking = 'pressure + draft + degradation': degraded material being stickier is PVC's characteristic; besides reducing pressure and temperature, anti-degradation and polishing are equally important; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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