Contents
How does corona discharge work?
Corona discharge occurs when the electric field is strong enough to create a chain reaction; electrons in the air collide with atoms hard enough to ionize them, creating more free electrons that ionize more atoms. Both positive and negative coronas rely on electron avalanches.
What is corona effect in electrical line?
Corona Discharge (also known as the Corona Effect) is an electrical discharge caused by the ionization of a fluid such as air surrounding a conductor that is electrically charged. Corona discharge can cause an audible hissing or cracking noise as it ionizes the air around the conductors.
What is the function of corona discharge in extrusion process?
Corona treating increases the surface energy of plastic films, foils and paper to improve wettability and adhesion of inks, coatings and adhesives. Treating works best when a substrate is treated at the time of extrusion and in-line prior to converting.
What will be produced when the corona wire produces an electrical discharge during printing?
An electric discharge is produced around the corona wire from which electrons drift along the applied electric field to charge the underlying surface. This reduces the voltage drop across the gap which then terminates the discharge. In printing this underlying surface is continuously moving during charging.
At what voltage does Corona occurs?
The separation between the plates is typically 5-10 mm. Positive corona discharge is normally used, mainly because of lower ozone production than with negative corona discharge. The corona voltage is in the range of 9-13 kV.
What is corona wire used for?
The corona wire uses static electricity to coat both the photoreceptive drum and the copy paper with a layer of positively charged ions. For a photocopier to work, a field of positive charges must be generated on the surface of both the drum and the copy paper.