Processing Machinery
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ASA processing equipment cross-contamination
Fenómeno do problema
After ASA shares equipment with halogen-containing materials such as PVC, the product shows black specks and accelerated degradation; investigation finds that previous material residue triggers catalytic degradation.
Análise das causas
Residual decomposition products of halogen-containing materials such as PVC have a catalytic degradation effect on ASA; equipment dead corners hide previous material that continuously releases harmful substances at high temperature; ordinary purging is difficult to completely remove.
Solução
①ASA and halogen-containing materials preferably produced on dedicated lines; ②thoroughly purge and verify when sharing lines; ③regularly dismantle and clean screw and barrel dead corners; ④establish a material switching contraindication table.
Conclusão principal
ASA is sensitive to previous halogen-containing residue; dedicated line production is the most reliable isolation; the material switching contraindication table is a basic management tool for error-proofing.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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