A high density polyethylene (HDPE)
Cylinder temperature of the feed zone 30 ~ 50 ℃ (50 ℃)
District 1 160 ~ 250 ℃ (200 ℃), District 2 200 ~ 300 ℃ (210 ℃), District 3 220 ~ 300 ℃ (230 ℃)
District 4 220 ~ 300 ℃ (240 ℃), District 5 220 ~ 300 ℃ (240 ℃), the nozzle 220 ~ 300 ℃ (240 ℃)
Temperature brackets proposed as a basic setting value, stroke utilization of 35% and 65% over the mold flow length to wall thickness from 50: 1 to 100: 1
Melt temperature 220 ~ 280 ℃, cylinder thermostat 220 ℃, mold temperature 20 ~ 60 ℃
Injection pressure has good flow properties, avoiding the use of excessive injection pressure 80 ~ 140MPa (800 ~ 1400bar); except for some of the thin-walled containers can reach 180MPa (1800bar).
Shrink packing pressure higher degree, takes a long time for products for packing, dimensional accuracy is a key factor, the injection pressure of about .30% to 60%
Back pressure of 5 ~ 20MPa (50 ~ 200bar); backpressure too easily lead to products where weight and uneven dispersion.
Injection speed thin-walled packaging containers requiring high injection speed, moderate injection speed is often more applicable to other types of plastic products.
High screw speed screw speed (linear velocity of 1.3m / s) is permitted, as long as the cooling time before the end of the plasticizing process can be completed; screw torque requirement is low.
Measuring stroke 0.5 ~ 4D (minimum value to maximum value); 4D metering stroke melt supply a sufficient residence time is important residues quantity 2 ~ 8mm, depending on the metering stroke and screw diameter.
Recovery rate can reach 100% recycled.
Shrinkage of 1.2% to 2.5%; easily distorted; high degree of shrinkage; 24h after no longer shrink (shrinkage after molding)
Point Gate gate system; heated hot runner, hot runner heat, pour in the sleeve; the cross-sectional area is relatively small, thin section articles have sufficient time machine downtime for specialized cleaning without using other materials; PE temperature Rise
Standard screw cartridge device, using the standard three-zone screw; containers for packaging products, shear mixing section and special section geometry (L: D = 25: 1), straight nozzle, non-return valve.
Second, polypropylene (PP)


Cylinder temperature of the feed zone 30 ~ 50 ℃ (50 ℃)
District 1 160 ~ 250 ℃ (200 ℃), District 2 200 ~ 300 ℃ (220 ℃), District 3 220 ~ 300 ℃ (240 ℃)
District 4 220 ~ 300 ℃ (240 ℃), District 5 220 ~ 300 ℃ (240 ℃)
Nozzle 220 ~ 300 ℃ (240 ℃)
Temperature brackets proposed as a basic setting value, stroke utilization of 35% and 65% over the mold flow length to wall thickness from 50: 1 to 100: 1
Melt temperature 220 ~ 280 ℃, cylinder thermostat 220 ℃, mold temperature 20 ~ 70 ℃
Injection pressure has good flow properties, avoiding the use of excessive injection pressure 80 ~ 140MPa (800 ~ 1400bar);
Some thin-walled containers, except up to 180MPa (1800bar).
Holding pressure to avoid condensation products produced wall, it takes a long time to be packing products (approximately 30% of the cycle time); 30% to about 60% of the injection pressure.
Back pressure 5 ~ 20MPa (50 ~ 200bar).
Injection speed thin-walled packaging containers requiring high injection speed (with accumulator); moderate injection speed is often more suitable for other types of plastic products.
High screw speed screw speed (linear velocity of 1.3m / s) is permitted, as long as the cooling time to complete before the end of the plasticizing process can be.
Measuring stroke 0.5 ~ 4D (minimum value to maximum value); 4D metering stroke melt supply a sufficient residence time is very important
Residual quantity 2 ~ 8mm, depending on the itinerary and metering screw speed.
Pre-drying is not required; if poor storage conditions, at a temperature of 80 ℃ drying 1h can be.
Recovery rate can reach 100% recycled.
Shrinkage of 1.2% to 2.5%; high degree of shrinkage; 24h will not shrink after (post-mold shrinkage).
Point Gate gate system or multi-point gate; heated hot runner, hot runner heat, pour in the sleeve; gate location article thickest point, or prone to large shrink.
Machine downtime periods without using other materials for specialized cleaning; PP temperature rise
Standard screw cartridge device, using the standard three-zone screw; containers for packaging products, shear mixing section and special section geometry (L: D = 25: 1), straight nozzle, non-return valve.
Three, polystyrene (PS)

Cylinder temperature of the feed zone 30 ~ 50 ℃ (50 ℃)
District 1 160 ~ 250 ℃ (200 ℃) District 2 200 ~ 300 ℃ (210 ℃) District 3 220 ~ 300 ℃ (230 ℃)
Zone 4 220 ~ 300 ℃ (230 ℃) zone 5 220 ~ 300 ℃ (230 ℃)