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Injection conditions
Item | PP | PA6 | PA66 | |
---|---|---|---|---|
Molding Temp. | ℃ | 210 ~ 250 | 240 ~ 280 | 280 ~ 300 |
Speed | % | Low or Medium | Low or Medium | Low or Medium |
Injection Pressure | bar | Medium | Medium | Medium |
Back Pressure | bar | 1 ~ 5 | 1 ~ 5 | 1 ~ 5 |
Hold Pressure | bar | NJ/P 50%↓ | NJ/P 50%↓ | NJ/P 50%↓ |
Mold Temp. | ℃ | 40 ~ 70 | 60 ~ 90 | 60 ~ 100 |
Melt Temp. of Resin | ℃ | 240 | 270 | 290 |
Cushion | mm | 7 ~ 10 | 7 ~ 10 | 7 ~ 10 |
Drying Condition | Dehumidified Air Dryer | 80℃ X 2hr | 80℃ X 5hr | 80℃ X 5hr |
Mold | Runner | Optimum : Round Channel (D = 2~3 X Product thickness max) → Typical : 6~12mm Avoid of sharp edges in the diversion R = 1/2D |
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Gate | D = Product thickness max + 2mm ↑(6mm↑) | |||
Screw/Nozzle | Screw Diameter | 40mm ↑ | Zone distribution | 60% feed, 20% transition 20% metering |
L/D | 18 ~ 22 | Compression ratio | 1 : 1.8 ~ 1 : 2.5 | |
Pitch | 1D | Orifice diameter | 4mm ↑ |