Injection molding defect countermeasure table

Injection molding defect countermeasure table injection molding defect countermeasure table

Note:
▲ increase adjustment ▼ reduce adjustment ☆ check correction
Plastic sprinkler Short shot Screw back shrink Spill hair Finished mold Sprue mold Poor surface Black grain Focal spot Black spots,
Black spot
Flow pattern Bonding line Silver pattern Fragile product Finished product deformation bubble
Injection pressure ▲ ▲ ▼ ▼ ▼ ▲ ▼ ☆ ▲ ▼ ☆ ▲
Injection speed ▲ ▲ ▼ ▼ ▼ ▲ ▼ ☆ ▲ ▼ ☆ ▼
Injection time ▲ ▲ ▼ ▼ ▼ ▲ ☆ ▲
Injection dose ▲ ▲ ▼ ▼ ▼ ▲ ☆ ▲
Secondary injection pressure â–² â–² â–¼ â–¼ â–¼ â–²
Secondary injection time â–² â–² â–¼ â–¼ â–¼ â–²
Tube temperature ▲ ▼ ▼ ▼ ▼ ▲ ▼ ▼ ▼ ▲ ▲ ▼ ▼ ☆ ▼
Nozzle and front temperature â–¼ â–¼ â–¼ â–¼ â–¼ â–¼
Feed pipe rear section temperature â–¼ â–¼ â–²
Raw material drying temperature â–² â–²
Raw material drying time â–² â–²
Mold temperature ▲ ☆ ☆ ▲ ▲ ▲ ▲ ▲ ☆
Screw speed â–¼ â–¼ â–¼ â–² â–² â–¼
Back pressure â–¼ â–² â–¼ â–² â–² â–² â–¼ â–²
Screw back distance â–² â–¼ â–¼
Closed mold pressure â–²
Cooling time ☆ ▲ ▲ ▼ ▼ ▲ ▼
Ejecting speed â–¼ â–¼
Check raw materials ☆ ☆ ☆ ☆ ☆ ☆
Gate and runner size ▲ ☆ ▲ ▲ ☆ ☆ ☆ ☆
Gate and sprue location ▲ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆
Mold lighting â–² â–² â–²
Mold chamfer overhaul ☆ ☆
Mold vent â–² â–²
Use of mold release oil â–² â–² â–¼ â–¼
Clean all parts of the mold ☆ ☆ ☆ ☆ ☆
Inspection tube ☆ ☆ ☆ ☆ ☆ ☆ ☆
Check hopper ☆ ☆ ☆ ☆ ☆ ☆

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