Common problems and solutions

Not feedingScrew crackChange the screw
Plastic block in the feeding holeGet rid of the block
Temperature too high in feeding partReset the feeding part temperature to assure
the waterway to go fluently
The material pieces too big
Change the feeding hole design, make the feeding part groove deeper.
Products have black dots or turn yellowScrew and barrel wear out
As to wear situation, change the screw or
Screw set have dead anglesChange the screw or tip set
Material carbonized
Use the screw material which has better anti corrosion
Nozzle orifice too smallDrill to be bigger
Screw compression ratio too bigChange the right screw
Screw temperature too highChange the design to decrease the shear heat
Bad plasticizingPlastic not melt enoughIncrease the barrel temperature
Bad color mixing
Bad screw color mixing effect
Use mixing design screw or mixing tip set or mixing nozzle.
Injection end not steadyCheck ring move gap too bigChange small move gap check ring
Check ring and seat ring not match wellChange new rings.
Gap between check ring ang barrel too bighChange the relative wear parts.
Leak between barrel and barrel headBarrel and barrel head not bond wellCheck the match between them
Barrel head surface not flat enoughCheck the surface.
Tensile Strength of screw and barrel is not enoughChang material 
Products have bubblesBack pressure too low, compression ratio too smallChange the size or design.
Injection speed too slow, screw not good in venting 
Screws has abnormal noiseBarrel has not installed wellCheck every size ; reset; take out the
impurities; bad liquidity raw 

Material should use good ejiction effect tip set
Screw barrel assemble size problem
Screw not straight enough
Screw ejection design not fluent
Barrel has impurities inside

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