Injection Molding
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PEI Holding Pressure and Time
Problem Phenomenon
Improper PEI holding settings cause sink marks or internal stress; the holding pressure ratio and time lack basis.
Cause Analysis
PEI holding pressure is about 50~70% of the injection pressure; holding time is adjusted according to wall thickness, usually 1~2 seconds per millimeter of wall thickness; excessive holding increases stress; insufficient holding produces sink marks.
Solution
①Take holding pressure at 50~70% of injection pressure; ②estimate holding time at 1~2 seconds per millimeter of wall thickness; ③optimize and fix by the weighing method; ④verify the balance between sink marks and stress.
Key Takeaway
PEI's 50~70% holding and 1~2 seconds/millimeter are practical formulas; the weighing method objectively fixes parameters; balance verification prevents extremes.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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