Charge Rollers
Fenner Precision has developed a Bias Charge Roller (BCR) system for electro-photographic equipment that offers a more eco-friendly and economical alternative to the standard corona wire.
The Fenner Precision Bias Charge Roller (BCR) System, which can be manufactured to most any specifications, raises the design bar for machine designers, including the ability to make the machine more compact. Made of semi-conductive polyurethane (PU), the BCR replaces the corona wire in the charging module of a printing engine. This roller generates 100 times less ozone than the corona wire and lasts 10 times longer than conventional rubber, PU foam or PU elastomeric charging systems. These advantages make it ideal for high-speed or digital offset commercial printing presses.
Traditional corona wires are subjected to high voltage which charges the surface of the photoconductor drum. This process presents inherent environmental issues. In addition to using great amounts of electricity, corona wires emit excess ozone and nitrogen oxide (NOx.)
The BCR's manufacturing process and material provides several intrinsic advantages. Fenner Precision's exclusive liquid cast manufacturing process provides a very uniform charge distribution to the organic photo conductor. A semi-conductive polyurethane composite material helps prevent the rapid breakdown of polyurethanes of the past. The composite material is non-sparking and resistant to imaging oil in liquid toner applications as well.
Because Fenner Precision's BCR uses a contact charging method versus the corona wire's non-contact method, a single roller can replace multiple corona wires in high-speed printing thus reducing costs and demand on power supplies. In addition the contact charging method cycles quicker than non-charging methods allowing for increased printing speed.