Molds & Tooling
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PP Short Shot Underfilling
Problem Phenomenon
【Problem Phenomenon】PP thin-wall long flow path end underfilling
Cause Analysis
PP is temperature-sensitive and solidifies quickly, the front of thin-wall long flow paths freezes causing short shots; insufficient pressure, temperature and speed, poor venting, and too small gates are all causes; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solution
Increase melt temperature, mold temperature, injection speed and pressure; strengthen venting; enlarge gates; high-flow grades; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
PP short shot is due to rapid solidification, increase temperature, increase speed, vent and enlarge gates; 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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