FIRE RETARDENT COATING TO FOAMS AND FIBERS
Original Publication Date: 1988-Dec-31
Included in the Prior Art Database: 2004-Apr-04
Xerox Disclosure Journal
In electrostatographic printing apparatus, the corona discharge devices produce ozone as an undesirable byproduct to their electrostatic charging functions. In certain machine configurations there is sufficient ozone produced that the machines contain filters to filter out ozone in air contained within the machine or exiting therefrom. These filters are generally of two types, either canister wherein the reactive material is loose formed and held in shape by a rigid exterior walled structure or a self-supporting foam which has the reactive material, typically activated carbon, finely disbursed in a three dimensional matrix of foam. Under heating or exposure to open flame, these filters typically either oxidize or burn and therefore do not pass the increasingly strict flammability standards. The fire or flame resistance may be enhanced by coating the foam and fiber filters with an inorganic coating of an alkali metal silicate or aluminum hydroxide.