Injection Molding
3 Aufrufe
Black spots on PET injection molded products
Problembeschreibung
Black or brown spots appear in PET transparent products, seriously affecting appearance qualification rate.
Ursachenanalyse
Material thermal degradation produces carbonized particles; carbon deposits on the barrel and screw fall off; the raw material is mixed with impurities; the screen is damaged.
Lösung
Reduce processing temperature and shorten residence time; regularly clean the barrel using purging material; strengthen raw material quality inspection; replace the screen.
Wichtigste Erkenntnis
PET black spots are a direct manifestation of degradation or contamination; clean production and temperature control are the way to prevent them.
War das hilfreich?
0 Personen fanden dies hilfreich
Vielen Dank für Ihr Feedback!