Vapor Scavenger in Thermal Ribbons
Original Publication Date: 1986-Jun-01
Included in the Prior Art Database: 2005-Mar-09
Thermal ribbons are necessarily heated in closed areas and such heating may produce vapors which are objectionable. A known scavenger such as ammonium thiocyanate or ammonium iodide may be dispersed through layers which are heated and transferred from a thermal ribbon during printing. The printing temperature breaks down those materials into an ammonia component, which is reactive with a broad range of possible vapors. Specifically, the ammonia will react with formaldehyde to form hexamethylene-tetramine.