Discharging Non-Conductive Surfaces
Discharging a non-conductive surface is considerably more difficult because the charges can not move, they can not equalize and, only the specific area of the charged surface that is touched is discharged. For example, if you brushed the top side of a plastic sheet with a conductive brush, the top side only would be discharged. The sides and bottom would still have the original charge.
When used for grounding, strip brushes are normally thin [as there is no electrical advantage to thick] and are normally filled with very fine diameter conductive or static dissipative material. If the intent is to touch to charged surface with the brush, the fiber is continuous as shown on the top right.
If inductive discharge is used, the fill material is normally spaced 1mm or 2mm apart. The corona discharge is enhanced by the fineness of the point of the conductor. Those shown on the right have a point that measures approximately 5 angstroms. Thunderon® tape has a conductive peel-and-stick backing and can be applied to any conductive surface.
Thunderon® is a patented organic fiber of copper sulfide chemically bonded to acrylic and nylon fibers, Thunderon® performs better than conventional carbon, stainless steel, or metal-plated fibers. Thunderon® offers unmatched corona discharge, superior conductivity, enhanced abrasion resistance and superior bend recovery, and antibacterial and odor-elimination properties. It is available in a wide range of materials, including filament, cloth, rope, tape, yarn and brushes.
Thunderon® is ideal for use in printing, office machines, business machines, photo finishing, paper converting, plastic converting, and textile machinery. It also has bacteriostatic applications in hospitals and clean room environments.