Analysis of common injection molding defects | flash

Reasons related to process parameters
Insufficient clamping force
Injection speed is too fast
Pressure maintaining switch late
Melt temperature is too high
The mold wall temperature is too high
Pressure maintaining too high
countermeasure
Increase clamping force
Reduce injection speed; Multistage injection: fast slow
Provide pressure maintaining switch earlier
Reduce barrel temperature
Reduce mold temperature
Reduce pressure holding
Reasons related to design
Die strength is not enough
Insufficient sealing of the mold at the parting line or convex edge
countermeasure
Increase mold strength
Redesign or process the mold