The comparison of one step blow molding and two step molding process

Complete injection, pulling , blowing process in a machine called the one-step process.One step is done after the preform injection stretch blow cooling action.
Power saving
High productivity
Without human
Reduce pollution

And the two-step method is the separation of injection and process on two machines separately.
The first step is to use a injection molding machine to inject bottle preform.
The second step is reheating preforms the preforms, stretch it become bottle.
It can reduce the investment ( personnel and equipment). Much smaller than the volume of the bottle for easy transportation and storage . Off-season production of preforms can be blown into the bottle during the peak season.