Molds & Tooling
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PVC Short Shot
Problem Phenomenon
Short shot at the filling end of PVC products
Cause Analysis
PVC melt has high viscosity and poor flow; short shot occurs when temperature is insufficient or venting is poor; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry data and should be confirmed first during troubleshooting
Solution
Take the upper limit of temperature; improve venting; enlarge gate and runner; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
PVC short shot relies on coordination of temperature, venting and runner; after confirming effectiveness, fix 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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