Material Drying
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PVC Bimetallic Barrel
Problem Phenomenon
After several months of PVC production, the barrel inner wall corroded, black specks and impurities increased, and maintenance costs were high
Cause Analysis
HCl released by PVC degradation combines with moisture to form hydrochloric acid, corroding ordinary nitrided steel barrels; corrosion pits in turn become retention degradation points, forming a vicious cycle of corrosion and degradation
Solution
①Use a bimetallic alloy lining for the barrel; ②regularly check the condition of the barrel inner wall; ③upon finding corrosion, immediately evaluate repair or replacement; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
The bimetallic barrel is standard equipment for PVC machines; the service life extension gained from anti-corrosion investment can reach 2-3 times; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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