PA process characteristics(4)

PA66 polyamide 66 or nylon 66 If the material is sealed before processing, then there is no need to dry. However, if the storage container is opened, it is recommended to dry in 85C hot air. If the humidity is greater than 0.2%, it needs to be vacuum dried at 105C for 12 hours.

　　 Melting temperature: 260~290C. The product for glass additives is 275~280C. The melting temperature should be avoided above 300C. Mold temperature: 80C is recommended. The mold temperature will affect the crystallinity, and the crystallinity will affect the physical properties of the product.

　　 For thin-walled plastic parts, if the mold temperature is lower than 40C, 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. Injection pressure: usually 750~1250bar, depending on material and product design. Injection speed: high speed (slightly lower for reinforced materials).

Runner and gate: Because the solidification time of PA66 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.