Moldeo por Inyección Biblioteca de Defectos
Referencia técnica para 13 defectos comunes de moldeo por inyección — causas raíz, acciones correctivas, parámetros de proceso y guía de materiales.
13
Tipos de defecto
225+
Causas documentadas
208+
Acciones correctivas
5M1P
Método de diagnóstico
Rebaba
Flash is excess material that escapes the mold cavity through gaps at parting lines, vents, or slides.…
Deformación
Warpage is dimensional distortion caused by uneven shrinkage from differential cooling or residual stress…
Rechupes
Sink marks occur when surface solidifies before the core, which then shrinks inward.…
Llenado incompleto
Short shot is failure to completely fill the mold cavity during injection.…
Marcas de quemado
Two types: Diesel Effect trapped air compresses and self-ignites at 300-400 deg C. Gate shear material de…
Líneas de soldadura
Weld lines form where two advancing melt fronts meet. If the fronts are too cool or have trapped air the …
Estrias Plateadas
Silver streaks are caused by steam moisture air or degraded material stretched along the flow path.…
Grietas / Fragilidad
Cracks occur from excessive internal stress improper drying wrong material or ESC from chemical contact.…
Variación Dimensional
Dimensional instability comes from inconsistent shrinkage process instability or tool wear. Plastics use …
Vacíos / Burbujas
Two types surface bubbles from moisture vs internal vacuum voids same mechanism as sink marks core shrink…
Hilos de Boquilla
Stringing occurs when residual melt in the nozzle tip is too fluid and elongates as the mold opens.…
Marcas de expulsor
Ejector marks occur when the part is too hot or soft during ejection causing pins to sink in or create lo…
Tiempo de Ciclo Largo
Cycle time is the total time for one complete injection molding cycle. Extended cycle time reduces produc…