Injection Molding
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Barrel corrosion of PET '2079851475616104452 machine
Problem Phenomenon
When processing halogen-containing flame retardant PET, corrosion pits appear on the barrel and screw, shortening their life.
Cause Analysis
Halogen flame retardants decompose at high temperature to produce acidic corrosive gases HCl/HBr; the screw and barrel materials are not corrosion-resistant.
Solution
Use corrosion-resistant bimetallic screws and barrels (containing nickel-chromium alloy); select non-halogen flame retardant systems (phosphorus-based, nitrogen-based); control processing temperature.
Key Takeaway
Flame retardant PET processing needs to be matched with corrosion-resistant equipment.
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