Polypropylene (PP)
Barrel temperature Feeding zone 30～50°C (50°C)
Zone 1 160 ~ 250 ° C (200 ° C)
Zone 2 200 ~ 300 ° C (220 ° C)
Zone 3 220 ~ 300 ° C (240 ° C)
Zone 4 220 ~ 300 ° C (240 ° C)
District 5 220 ~ 300 ° C (240 ° C)
Nozzle 220 ~ 300 ° C (240 ° C)
The temperature in parentheses is recommended as the basic setting, the stroke utilization is 35% and 65%, and the ratio of module flow length to wall thickness is 50:1 to 100:1.
Melt temperature 220～280°C
Barrel constant temperature 220 ° C
Mold temperature 20～70°C
Injection pressure has good flow performance, avoiding excessive injection pressure of 80 ~ 140MPa (800 ~ 1400bar);
Except for some thin-walled packaging containers up to 180MPa (1800bar)
Holding pressure Avoiding the shrinkage of the product, it takes a long time to hold the product (about 30% of the cycle time); about 30% to 60% of the injection pressure
Back pressure 5～20MPa (50～200bar)
Injection speed requires high injection speed (with accumulator) for thin-walled packaging containers; medium injection speeds are often suitable for other types of plastic products. High screw speeds (linear speeds of 1.3 m/s) are permissible, as long as It can measure the stroke 0.5~4D (minimum to maximum) after completing the plasticizing process before the end of the cooling time; the 4D metering stroke provides the strand with a sufficiently long residence time, which is very important, the residual material amount is 2~8mm, depending on Pre-drying is not required for metering stroke and screw speed; if the storage conditions are not good, the recovery rate can reach 100% recovery shrinkage of 1.2 to 2.5% at a temperature of 80 ° C for 1 h; the degree of shrinkage is high; Will shrink again (contraction after molding)
Gate system point gate or multi-point gate; heated hot runner, insulated hot runner, in-situ sleeve; gate location is at the thickest point of the product, otherwise it is prone to large shrinkage machine shutdown period without using other materials Special cleaning work; standard screw for PP temperature-resistant barrel equipment, standard three-stage screw; special for packaging container products, mixing section and shear section geometry (L: D=25:1), straight-through nozzle , check valve
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