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Reasons and countermeasures for poor Rigid plastic injection molding

Reasons and countermeasures for poor Rigid plastic injection molding

Reasons and countermeasures for poor Rigid plastic injection molding

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▲ Increase
▼ Decrease		 pressure speed time temperature Causes and solutions
Back pressure Injection pressure Filling pressure Screw pressure relief Injection speed Mold opening speed Screw advance time Molding cycle Melt temperature Mold temperature Nozzle temperature
Bubble/vacuum bubble 　 ▲ ▲ ▼ 　 　 ▲ 　 ▼ ▲ 　 Improve exhaust, expand gate and minimum wall thickness area
Burn mark 　 ▼ 　 　 ▼ 　 ▼ ▼ 　 　 　 Improve exhaust and change gate position
Discoloration ▼ 　 　 　 ▼ 　 ▼ ▼ 　 　 ▼ Through the barrel, clear screw, barrel, nozzle
Ejection deformation 　 　 ▼ 　 　 ▼ 　 　 　 　 　 Check the cavity surface, improve demoulding
Abnormal screw retreat ▲ 　 　 　 　 ▲ 　 　 　 　 　 Check screw wear
Flash ▼ ▼ ▼ 　 ▼ 　 　 ▼ ▼ 　 　 Mold trimming, clamping force is too low
Flow marks 　 　 　 ▲ 　 ▼ 　 　 　 ▲ 　 Enlarge gate and improve exhaust
Thimble 　 　 ▼ 　 　 ▼ 　 ▲ 　 　 　 Poor mold cooling
Layer peeling 　 ▲ ▲ 　 ▲ 　 　 　 ▲ ▲ 　 Raw material contamination, expand gate
Nozzle casting ▼ 　 　 　 　 ▲ 　 　 ▼ 　 ▼ Use chamfered nozzle
Product sticking mold 　 ▼ ▼ 　 ▼ 　 ▼ ▲ ▼ ▼ ▲ Check the cavity surface damage
Low weld line strength 　 ▲ ▲ 　 ▲ ▼ 　 　 　 ▲ ▲ 　 Improve exhaust, gate location, clean exhaust groove
Lack of glue 　 ▲ ▲ 　 ▲ 　 ▲ 　 ▲ ▲ 　 Expand gate and increase injection volume
Unstable injection volume 　 　 ▲ 　 ▲ 　 ▲ 　 　 　 　 Check valve leakage
Shrink mark 　 ▲ ▲ 　 　 　 ▲ 　 ▲ ▼ 　 　 Expand gate
Hysteresis mark 　 　 　 ▼ ▼ 　 　 　 ▼ ▲ ▼ Raw materials are damp
Material handle sticky mold 　 　 ▼ 　 　 　 ▼ 　 　 　 ▲ The material handle casing is damaged, increasing the bevel angle
Surface contamination 　 ▲ ▲ 　 ▲ 　 　 ▲ 　 ▲ 　 Raw materials are damp
Infusible particles ▲ 　 　 　 　 ▲ 　 　 ▲ 　 　 Check the heater
Warpage 　 　 ▲ 　 ▲ ▼ 　 ▼ ▲ ▲ ▼ ▼ 　 Check the position of the cooling pipe
Leukoplakia ▼ ▲ 　 ▼ ▼ 　 　 　 　 ▲ 　 Raw materials are damp
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