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
| 등급 | 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 |
| 금형 온도 | 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.
Our Capabilities
With over 300 CNC machines, we produce more than 10,000 pieces daily with tolerances as tight as ±0.005mm. We accept MOQ from 1 piece, with delivery times ranging from 24 hours to 15 days. Our injection molding expertise covers all nylon grades with rigorous quality control. Get a quote within 24 hours.
자주 묻는 질문
Can I skip drying nylon if I process it immediately after opening?
No. Even freshly opened bags contain enough moisture to cause defects. Always dry nylon before processing.
What happens if I overheat nylon during molding?
Overheating causes thermal degradation: reduced molecular weight, discoloration, increased brittleness. In severe cases, toxic fumes are released.
Why are my glass-filled nylon parts warping?
Glass fiber orientation creates anisotropic shrinkage. Solutions include optimizing gate location, uniform mold temperatures, and increased hold pressure.
What’s the optimal hold pressure and time for nylon?
Hold at 50-75% of injection pressure until gate freezes—typically 5-12 seconds for small parts, 15-30 seconds for larger parts.
