Nylon is one of the most widely injection molded engineering thermoplastics, but its unique processing characteristics—moisture sensitivity, narrow melting range, and rapid crystallization—require specific knowledge to achieve consistent quality.
Material Preparation: Drying is Critical
| グレード | Drying Temp | Time | Target Moisture |
|---|---|---|---|
| PA6 | 80°C | 4-8 hrs | < 0.10% |
| PA66 | 80°C | 4-8 hrs | < 0.10% |
| PA6 GF30 | 80°C | 4-6 hrs | < 0.05% |
Processing Parameters
| Parameter | PA6 | PA66 | PA6 GF30 |
|---|---|---|---|
| Melt Temperature | 240-270°C | 270-300°C | 250-280°C |
| 金型温度 | 60-90°C | 80-100°C | 80-100°C |
| Injection Pressure | 70-120 MPa | 80-140 MPa | 80-150 MPa |
Mold Design for Nylon
Gate Design
Gate size should be 50-75% of wall thickness. Position gates to ensure uniform flow and minimize fiber orientation issues in glass-filled grades.
Venting
Proper venting is essential—nylon’s low viscosity means it fills quickly and can trap air. Vent depth of 0.01-0.03mm is typical.
Common Defects and Solutions
| Defect | Cause | Solution |
|---|---|---|
| Splay/Silver Streaks | Moisture | Dry material properly |
| Brittle Parts | Overheating | Reduce melt temp; verify drying |
| Warpage | Uneven cooling | Adjust mold temp; optimize gate |
| Flash | Low viscosity | Reduce injection speed |
Post-Molding Handling
Moisture Conditioning
Nylon parts are at their most brittle straight out of the mold. Accelerated conditioning in 50-80°C water for 1-4 hours improves impact resistance and toughness.
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よくあるご質問
When does Nylon Injection Molding Guide: Processing Parameters, Best Practices, and Troubleshooting make sense?
Nylon Injection Molding Guide: Processing Parameters, Best Practices, and Troubleshooting makes sense when the part volume, material choice, geometry, and repeatability needs justify mold design and tooling investment.
What design factors matter most for Nylon Injection Molding Guide: Processing Parameters, Best Practices, and Troubleshooting?
Wall thickness, ribs, bosses, draft angle, gate location, shrinkage, parting line, and ejection all affect molded part quality.
What information is needed before mold production?
The supplier should confirm the 3D model, material, expected annual volume, appearance requirements, tolerance needs, and any assembly or functional testing requirements.
What is the biggest risk in Nylon Injection Molding Guide: Processing Parameters, Best Practices, and Troubleshooting?
The biggest risk is approving tooling before material behavior, shrinkage, flow, and part function are fully checked against the real application.
