Barrel temperature Feeding zone 30 ~ 50℃ (50℃)
Zone1 160～250℃（200℃）,
Zone2 200～300℃（220℃）,
Zone3 220～300℃（240℃）
Zone4 220～300℃（240℃）,
Zone5 220～300℃（240℃）
Nozzle 220 ~ 300℃ (240℃)
The temperature in brackets is recommended as the basic set point, the stroke utilization is 35% and 65%, and the ratio of module flow length to wall thickness is 50:1 to 100:1
The melting temperature is 220 ~ 280℃, the cylinder constant temperature is 220℃, and the mold temperature is 20 ~ 70℃
The injection pressure has good flow performance, avoiding excessive injection pressure of 80 ~ 140MPa (800 ~ 1400bar);
Some thin-walled packaging containers can reach 180MPa (1800bar) except.
The pressure holding pressure avoids the shrinkage of the product, which takes a long time to hold the pressure of the product (about 30% of the cycle time); About 30% ~ 60% of the injection pressure.
Back pressure 5 ~ 20MPa (50 ~ 200bar).
Injection speed High injection speed (with accumulator) is required for thin-walled packaging containers; The medium injection speed is often more suitable for other types of plastic products.
High screw speed (linear speed of 1.3m/s) is allowed, as long as the plasticization process is completed before the end of the cooling time.
Measuring stroke 0.5 ~ 4D (minimum ~ maximum value); It is important that the 4-D metering stroke provide sufficient dwell time for the molten material.
The amount of residual material is 2 ~ 8mm, depending on the metering stroke and screw speed.
Pre-drying is not required; If the storage condition is not good, it can be dried at 80℃ for 1h.
The recovery rate can reach 100%.
Shrinkage rate 1.2-2.5%; High shrinkage degree; It will not shrink again after 24 hours (shrinkage after forming).
Gate system point gate or multi-point gate; Heating type hot runner, thermal insulation type hot runner, inner pouring sleeve; The gate position is at the thickest point of the product, otherwise it is prone to large shrinkage.
There is no need for special cleaning work with other materials during machine downtime; PP temperature rise resistance
Barrel equipment standard screw, standard use of three-stage screw; For packaging container products, special geometry of mixing section and shear section (L: D = 25:1), through nozzle, check valve
Shandong Orient Hongye Chemical Co., Ltd. is an excellent supplier of polypropylene and polypropylene manufacturers.
