PET Preofrom is embryo of PET bottle. With thicker wall thickness, more transparency, plus fall not broken, can stand on the table, so PET Preform sealed by plastic cap can used as test tube.

PET Preform is usually forming by hot runner PET Preform mould

Hot runner with good blance performance can assure the flow rate and pressure of PET melt in all the PET Preform cavity is averagely.

The best heat distribution ensure AA in all PET Preform mould cavity is stable.

There is heat shield between PET Preform mould and plastic injection machine clamping plate. Thickness is around 12mm is better. This heat shield should can bear high pressure. Should have very good air-out function to avoid local overheating or shattering.  But air vent depth is not large than 0.03mm, or else, flash will be easy occur.