what cause static:
the most common cause are friction,pressure and separation, examples range from the unwinding of plastic fims to the everyday occurences of shocks from cars and door knobs. other causes include induction,whereby an insulator materials can become charged if itis brought into an electrical field temperature changr can also generate a static charge: a godd example is the generation of static charges on injection moulding as they cool.

AC static elimination
a normal mains 110/220V,50/60HZ AC supply is increased by a special transformer to typically 7KV AC. This high voltage is carried by a sheild HV cable to the static eliminator,where it is connected to an array of emitter pins that are stressed by the elevated voltage in proximity to an eartyed surfacr. this creates a high energy"corona" or "ion cloud".in which a very large number of positive and negative ions are generated. as the AC cycle changes,either positiveor negative ions are produced in approximately equal quantities, A staticallycharged of either polarity passing close to this ion cloud wil be quickly neutralised