Molds & Tooling
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PC Sink Marks and Holding Pressure
Problem Phenomenon
[Problem Phenomenon] PC thick-wall rib areas have sink marks, and the holding pressure adjustment effect is inconsistent
Cause Analysis
The outer layer of thick walls solidifies first and the inner shrinkage pulls in; insufficient holding pressure or early gate freezing; overly thick rib structure is the cause; when troubleshooting on site, verify each item according to this mechanism one by one, and avoid blindly adjusting the machine based on experience alone
Solution
Raise the holding pressure to 40-60% and extend the time; halve the rib thickness; reduce material and strengthen cooling in thick areas; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes, so as to locate effective measures
Key Takeaway
For PC sink marks, first check the wall thickness and rib thickness, followed by holding pressure feeding; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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