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Trouble Shooting
Defection Possible Causes Corrective Actions
Bubbles caused by   Insufficient material drying Pre-dry material as instruction
excessive material Pay attention to the temperature 
humidity content control of the barrel
Wild line Inappropriate barrel temperature Increase barrel temperature
　 Insufficient injection pressure Increase injection pressure
　 Inappropriate mould temperature Increase mould temperature
　 Inadequate venting at weld(s) Increase air venting
Shrinkage Varied parts wall thickness during cooling Uniform wall thickness part design
　 Insufficient injection pressure Increase injection pressure
　 Insufficient material feed Increase material feed
　 Mould temperature too high or insufficient  Increase cooling time 
　 cooling 　
　 Insufficient back pressure Increase holding time
　 Inappropriate sizes of runners,gates,or vents Increase sprue runner,gate sizes 
Discolouration Inappropriate barrel temperature Decrease barrel temperature
(whole or patial  Material remained inside the barrel Avoid dead-angle structure inside barrel
discoloured) Material inside the joint of the barrel and  Eliminate the gaps of the joint 
　 injection entrance(long-term) Modify to propriate design to prevent 
　 Installed valve or ring to prevent material return material remainings
　 Insufficient material drying  Pre-dry material as instruction
　 Injection machine capacity too large Change to a appropriate size injection machine
Slivery Streaks Inappropriate barrel temperature Decrease barrel temperature
　 Residence time too long  Eliminate the material remainings
　 Inappropriate injection speed Decrease the injection speed
　 Inappropriate sizes of runners,gates,or vents Increase sprue runner,gate sizes 
　 Insufficient material drying Pre-dry material as instruction
　 Inappropriate injection pressure Decrease injection pressure
Wrinkles(solid colour) Inappropriate injection speed Decrease injection temperature
　 Inappropriate back pressure time Decrease back pressure time
　 Inappropriate mould temperature Increase mould temperature
　 Inappropriate sizes of runners,gates,or vents Increase sprue runner,gate sizes 
Flow marks  Inappropriate mould temperature Increase mould temperature
　 Inappropriate injection pressure Decrease injection pressure
　 Inappropriate sizes of runners,gates,or vents Increase sprue runner,gate sizes 
Mould sticking Insufficient tapers /draft angle on mould/sprue  Increase taper/draft angle
　 Inappropriate holding time  Decrease the holding time and cooling time 
　 Inappropriate barrel temperature Decreade the injection temperature
　 Inappropriate locations or amounts of ejection Design appropriate locations and quantities 
　  pins of ejection pins
　 Undercuts at mould/moving slides failure Polish cavity surface and sprue,runner,gate channels
　 Inappropriate mould temperature Decrease mould temperature, extend the recycle time
　 Injection pressure too high, mould release/ Decrease injection pressure, reduce the 
　 resins lubricant used too much material quantities
Brittleness Insufficient material drying Pay attention to drying machine and lid 
　 Mould temperature too low, injection pressure management
　 and back pressure too high Adjust to appropriate moulding conditions
　 Varied parts wall thickness,internal stress Uniform wall thickness 
　 created by inappropriate mould release Avoid sharp corners and modify notched locations
　 Thermal degradation by overheating  Decrease barrel temperature
　 Material contamination Clean up the barrel and lid regularly
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