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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