Processing Machinery
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PVDF Processing Corrodes Equipment
Problem Phenomenon
After a period of processing, corrosion marks appear on the barrel, screw, and mold, and product quality fluctuates accordingly.
Cause Analysis
PVDF releases trace amounts of hydrofluoric acid (HF) during melt processing, which is corrosive to ordinary steel; HF release intensifies when the temperature is too high or the residence time is too long.; During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Solution
①Use highly corrosion-resistant steel or coatings (such as Xaloy, nickel-based alloys) for parts in contact with the melt; ②control the processing temperature not to exceed the upper limit; ③shorten the residence time; ④purge with PE cleaning material before shutdown.
Key Takeaway
PVDF corrosion is determined by its fluorine-containing nature; corrosion-resistant equipment configuration is an entry condition for processing PVDF, and ordinary mold steel cannot be used directly.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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