Injection Molding
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PVC Equipment Specialization
Problem Phenomenon
Processing PVC with an ordinary '2079851475616104452 machine caused severe corrosion and scrapping of the barrel and screw within three months
Cause Analysis
The nitrided steel barrel and general-purpose screw of ordinary equipment cannot resist HCl corrosion; PVC-dedicated equipment includes a bimetallic barrel, low compression ratio chrome-plated screw, large-orifice nozzle, and multi-zone PID temperature control
Solution
①Produce PVC with dedicated or modified equipment; ②check anti-corrosion configuration at equipment acceptance; ③conduct compatibility evaluation before converting ordinary equipment to PVC; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
Specialization of PVC equipment is the entry threshold; missing any one of the four anti-corrosion pieces discounts equipment life; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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