Creating a static-free environment

November 2001 Analytical Instrumentation & Environmental Monitoring

Materials such as paper, plastic and textiles normally contain an equal number of positive and negative charges - that is, they are electrically balanced. Friction can disturb this balance, causing the material to become electrically charged.

The electrical charge (static) will exert a force on nearby charged objects or a grounded conductor. Among the problems caused by this force are:

* Dust clinging to product.

* Product clinging to itself, rolls, machine beds or frames.

* Materials tearing, jamming or curling.

* Sheet-feeding problems.

* Hazardous sparks or shocks.

Exair static eliminators are a solution to the problem of static build-up. They maximise ionised airflow while minimising compressed air consumption. A small amount of compressed air is used to entrain a high volume flow of surrounding air. This combined stream is ionised by an emitter point (or points) and delivered to the charged surface. Static is neutralised from distances up to 6 m away.

Thus, these devices provide effective neutralisation in spite of obstructions, 3-D configurations, web 'rippling', etc. Tests have shown an Exair staticd eliminator positioned 610 mm from the charged surface to be as effective as a static bar without air delivery positioned 13 mm from the surface.

ETEST

(031) 767 1779

[email protected]

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