In order to improve the yield of nylon PA6 and nylon PA66 injection molding products, the following are the precautions for molding of nylon PA6 and nylon PA66 injection molding products:
Modified fiber-added nylon material
1. The injection temperature and drying temperature should be high; the injection pressure and holding pressure should not be too high or too long. The male mold should be injected at high speed, and there should be exhaust channels to avoid burning of the glue; the back pressure is 50~150kg/cm.
2. Plastics must not be placed in the melting drum before reaching the drying level. Because they are very moisture-containing, they can easily get stuck in the rod groove of the feeding section, resulting in difficulty in feeding.
3. When forming, it is most likely to cool at the injection nozzle. If the injection pressure is increased during cooling, it is easy to cause the check valve to break, so the temperature control at the injection nozzle must be appropriate. To prevent plastic from overflowing into the mold due to feeding, a controlled injection nozzle is suitable.
4. When using other plastics for injection, it should be noted that the original nylon heating temperature is above 270℃, while the general material heating temperature can only operate at around 200℃. Therefore, the melting drum must be heated to the nylon heating temperature before operating, otherwise the screw check valve and the glue splitting head may easily break.
fiber nylon black material
5, the molding shrinkage rate is about 1.5~2.5%. The heating temperature of
6 and nylon 6 (PA6) is 220~300℃, and the heating temperature of nylon 66 (PA66) is 250~380℃.
7. Temperature setting: nozzle 235~265℃; front section 235~245℃; middle section 210~240℃; rear section 195~230℃; screw speed 100~105rpm; mold temperature 35~40℃; back pressure 5~10kg.
8, density 0.94~1.14g/cc, deformation temperature 35~121℃, molding shrinkage rate 0.7~2.5%.
