Injection Molding
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PVDF Injection Mold Material and Corrosion
Problem Phenomenon
【Problem phenomenon】The runner and cavity surfaces of PVDF molding molds gradually corrode and roughen, and product appearance deteriorates accordingly
Cause Analysis
Trace HF acting over the long term corrodes ordinary mold steel, and corrosion products in turn contaminate the melt forming a vicious cycle; fluoroplastic molds require corrosion-resistant steel and surface treatment; During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Solution
Select corrosion-resistant stainless steel or hard chrome/nickel plating treatment for mold runners and cavities; regularly check runner surface condition; thoroughly clean when changing material to prevent cross corrosion; After adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PVDF molds require corrosion-resistant material selection plus regular inspection; corrosion self-amplifies; After confirming effectiveness, fix 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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