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