1. PA6 is easy to absorb moisture, so special attention should be paid to the drying before processing. If the material is supplied in waterproof packaging, the container should be kept tightly closed. If the humidity is greater than 0.2%, it is recommended to dry in hot dry air above 80℃ for 3h~4h. If the material has been exposed to the air for more than 8 hours, it is recommended to vacuum dry at 105°C for more than 1h~2h. It is best to use a dehumidifying dryer.
2. If the material of PA66 is sealed before processing, there is no need to dry it. If the storage container is opened, drying in hot dry air at 85°C is recommended. If the humidity is greater than 0.2%, vacuum drying at 105°C for 1h~2h is required. It is best to use a dehumidifying dryer. Molding temperature: 260℃~310℃, for reinforced varieties, it is 280℃~320℃.
1. PA6: 80℃~90℃. Mold temperature significantly affects crystallinity, which in turn affects the mechanical properties of plastic parts.
Take PA6 6 gf50 for example, higher mold temperatures are also recommended for thin-walled, longer-flow plastic parts. Increasing the mold temperature can increase the strength and stiffness of the plastic part, but it reduces the toughness. If the wall thickness is greater than 3mm, it is recommended to use a low temperature mold of 20℃~40℃. For glass reinforcement, the mold temperature should be greater than 80 °C.
2. PA66: 80℃ is recommended. Mold temperature will affect crystallinity, and crystallinity will affect the physical properties of the product.
For thin-walled plastic parts, like PA66 gf 20, if a mold temperature lower than 40°C is used, the crystallinity of the plastic parts will change with time. In order to maintain the geometric stability of the plastic parts, annealing treatment is required.
1. PA6: 230℃~280℃, 250℃~280℃ for enhanced varieties.
2. PA66: 260℃~290℃. The product of glass additive is 275~280℃. Melting temperatures above 300°C should be avoided.
Both are generally between 750bar and 1250bar (depending on material and product design).
Since the solidification time of PA6 and PA66 is very short, the location of the gate is very important. The gate diameter should not be less than 0.5*t (here t is the thickness of the plastic part). If a hot runner is used, the gate size should be smaller than with conventional runners, as the hot runner can help prevent premature solidification of the material. If embedded gates are used, the minimum diameter of the gate should be 0.75mm.
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