Stampaggio a Iniezione Libreria Difetti
Riferimento tecnico per 13 difetti comuni dello stampaggio a iniezione — cause, azioni correttive, parametri di processo e guida materiali.
13
Tipi di difetti
225+
Cause documentate
208+
Azioni correttive
5M1P
Metodo diagnostico
Bava
Flash is excess material that escapes the mold cavity through gaps at parting lines, vents, or slides.…
Deformazione
Warpage is dimensional distortion caused by uneven shrinkage from differential cooling or residual stress…
Risucchi
Sink marks occur when surface solidifies before the core, which then shrinks inward.…
Colpo corto
Short shot is failure to completely fill the mold cavity during injection.…
Bruciature
Two types: Diesel Effect trapped air compresses and self-ignites at 300-400 deg C. Gate shear material de…
Linee di saldatura
Weld lines form where two advancing melt fronts meet. If the fronts are too cool or have trapped air the …
Striature Argentate
Silver streaks are caused by steam moisture air or degraded material stretched along the flow path.…
Crepe / Fragilità
Cracks occur from excessive internal stress improper drying wrong material or ESC from chemical contact.…
Variazione Dimensionale
Dimensional instability comes from inconsistent shrinkage process instability or tool wear. Plastics use …
Vuoti / Bolle
Two types surface bubbles from moisture vs internal vacuum voids same mechanism as sink marks core shrink…
Filatura Ugello
Stringing occurs when residual melt in the nozzle tip is too fluid and elongates as the mold opens.…
Segni espulsore
Ejector marks occur when the part is too hot or soft during ejection causing pins to sink in or create lo…
Tempo Ciclo Lungo
Cycle time is the total time for one complete injection molding cycle. Extended cycle time reduces produc…