Injection Molding Trouble Shooting
Problems WaterMark Streak Flash WeldLine PoorSurface Unfilled Burn ColorProblem Deform Thick Crack
PossibleReason
Low Barrel Temp ● ● ● ● ● ●
High Barrel Temp ● ● ● ● ●
High Injection Pressure ● ● ●
Low Injection Pressure ● ● ● ●
Short Packing Time ●
Long Packing Time ● ● ●
High Injection Speed ● ●
Low Injection Speed ● ●
Poor Cooling ● ●
Poor Mold Temp Control ● ● ●
Long Cycle ●
Short Cycle ● ●
Big Runner Or Sprue ●
Small Runner Or Sprue ● ● ● ● ●
Poor Gate Position ● ● ● ●
Low Clamping Force ● ●
Poor Venting ● ● ● ●
Insufficient Feeding ● ● ●
Improper drying Time And Temp ● ● ●
Foreign Material ● ● ● ●
Poor Clean ● ● ●
Improper Releasing Agent ● ●
Slow Flowing ● ●
Quick Flowing ●

water mark

unfilled

flash

burn

silver streak

weld line

 burn