Injection Molding
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HDPE '2079851475616104452 flash
Problem Phenomenon
Thin flash on the parting line.
Cause Analysis
Low HDPE viscosity easily penetrates the parting line gap; high pressure, insufficient clamping, parting line wear.
Solution
①Reduce injection/holding pressure; ②increase clamping force; ③repair the parting line; ④appropriately lower the melt temperature.
Key Takeaway
Low viscosity + high shrinkage = the balancing act between flash and sink marks.
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