The main parameters to look at in an injection molding machine:
Injection volume: the volume or mass of PS injected at one time.
Injection speed: the time needed to complete a shot.
Melting capacity: the mass of melted plastic in 1 hour.
Mold clamping force: the force to lock the mold, in tons.
Time required for one molding: the shorter the better.
Power consumption, the lower the better.
Strength of the moldboard and tie rods, don't crack or even break with use.
Life: good injection molding machine with 10 years can also be depreciated by 50% as a second-hand phone to sell, the poor one is about 5 years.
Hydraulic machine to see whether the oil leakage, if the seal is not good, often leakage of oil will affect the accuracy.
Screw life: screws are wearing parts, often change.
PLC speed, the faster the better.
Hydraulic machine solenoid valve is also very important, high-end its response speed is very fast.
The durability of the oil pipe.