Plastic processing troubleshooting

From Plastics Wiki, free encyclopedia

Contents 1 Surface Defects 2 Burning and Contamination Problems 3 Physical Problems 4 Geometry Maintenance Problems 5 Structural Defects

Surface Defects

• Flow lines and jetting
• Splay (moisture or trapped air)
• Haze, blush, and poor gloss
• Orange peel and surface ripples
• Gate blush and gate splay

Burning and Contamination Problems

• Burn marks and black specks
• Burn streaks
• Contamination
• Discoloration or poor color match

Physical Problems

• Flash and short shots
• Sink marks
• Vacuum voids and bubbles
• Blisters and delamination

Geometry Maintenance Problems

• Under- or over-sized dimensions
• Poor dimensional repeatability (poor Cpk)
• Warpage and bowing

Structural Defects

• Cracking, crazing, and brittleness
• Weld lines
• Stuck parts and pin push marks
• Long gates and plugged gates
• Drag marks and mold damage