Molds & Tooling
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Parting line wear from flash of PP products
Problem Phenomenon
Parting line flash gradually worsens with production.
Cause Analysis
Parting line wear or platen deformation makes the fit loose; PP has good flowability, and tiny gaps are squeezed into by the high-pressure melt.; during on-site investigation, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solution
①Grind and repair the parting line; ②check the clamping force; ③check the platen parallelism; ④optimize the injection pressure curve.; after adjustment, continuously sample and verify the effect, and resume mass production after confirming stability
Key Takeaway
Progressive flash indicates mold wear; repair the mold in time to avoid batch defects.; 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 investigating similar problems in the future
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