Molds & Tooling
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PP Gate Size Design
Problem Phenomenon
[Problem Phenomenon] PP gate too small causes insufficient feeding or too large leaves obvious marks
Cause Analysis
Gates are designed according to wall thickness: too small freezes early with insufficient feeding and sink marks; too large has small pressure loss but obvious marks; PP's high shrinkage needs a sufficiently large gate to ensure feeding; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based on experience alone
Solution
Gate size ensures the feeding channel; for sink mark parts check whether the gate is too small; submarine pin-point gates for appearance parts; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PP gates must be large enough to feed the large shrinkage; submarine pin-point gates for appearance parts; 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 future problems
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