PA process characteristics(3)

PA6 polyamide 6 or nylon 6: PA6 easily absorbs moisture, so special attention should be paid to drying before processing. If the material is supplied in waterproof packaging, the container should be kept closed. If the humidity is greater than 0.2%, it is recommended to dry in hot air above 80C for 16 hours. If the material has been exposed to air for more than 8 hours, it is recommended to perform vacuum drying at 105C for more than 8 hours.

　　 Melting temperature: 230~280C, 250~280C for reinforced varieties. Mold temperature: 80~90C. Mold temperature significantly affects the crystallinity, which in turn affects the mechanical properties of plastic parts. The crystallinity is very important for structural parts, so the mold temperature is recommended to be 80~90C.

　　 For thin-walled, long-flow plastic parts is also recommended to apply a higher mold temperature. Increasing the mold temperature can increase the strength and rigidity of plastic parts, but reduces the toughness. If the wall thickness is greater than 3mm, it is recommended to use a low temperature mold of 20~40C. For glass reinforced materials, the mold temperature should be greater than 80C. Injection pressure: generally between 750~1250bar (depending on the material and product design).

Injection speed: high speed (slightly reduced for reinforced materials). Runner and gate: Because the setting time of PA6 is very short, the location of the gate is very important. The gate diameter should not be less than 0.5*t (where t is the thickness of the plastic part). If you use a hot runner, the gate size should be smaller than using a conventional runner, because the hot runner can help prevent the material from solidifying prematurely. If a submerged gate is used, the minimum diameter of the gate should be 0.75mm.