The design of a glove box for the handling of electrostatic sensitive
devices within an inert gas environment demands an understanding
of the problems, selective specification of equipment, construction
techniques, and test procedures to achieve a satisfactory application.
The moisture free gas passing through the glove box generates static
electricity by friction of moving "bodies" creating ions.
In practice it is almost impossible to avoid friction in the processing
of materials and when one "body" experiences friction
with another "body", the body with the lower work function
loses an electron to the body with a higher work function. The body
with excess electrons takes on a negative charge and the body with
a reduced number of electrons that of a positively charge.
This is however only a temporary change, for as soon as the opportunity
presents itself the electrons will neutralise themselves in either
a controlled manner or uncontrolled manner.
Uncontrolled static can have serious detrimental effects on process
handling of electronic devices. Control is achieved by neutralising
electrostatic charges via ion bombardment of the workspace, and
this is best achieved utilising the principles of fluid dynamics
to distribute the ion bombardment to the desired work zone by laminar
Ion bombardment is achieved by a high voltage ion generator (ioniser)
which delivers a high speed pulsed voltage to a series of electrode
probes. Intelligent static elimination enables the quantity of positive
and negative ions to be generated to maintain the optimum balance
for neutralising the target zone.
Additional features such as metal coated glass windows and bonded
grounding against E.S.D. including glove ports, make sure our glove
boxes are equipped with static elimination controls which go a long
way towards minimising the problems associated with handling sensitive