Test for Surface Energy of Coated Xerographic Carrier
Original Publication Date: 1981-Sep-01
Included in the Prior Art Database: 2005-Feb-12
Many xerographic carriers are comprised of 200-300-micron spherical steel shot coated with a fluoropolymer, or with a coating system which includes one or more fluoropolymers. These carriers resist failure due to fused-on-toner (FOT) because of the low surface energy and low cohesive strength of the fluoropolymers. However, during normal use of the carriers a certain amount of the fluoropolymer coating will be worn away, which will result in a surface having a higher surface energy. The higher the surface energy the more propensity there is for failure by filmed-on-toner. Hence, it is desirable to know the surface energy level or average surface energy level of any batch of carrier at various times during its cycle of use in a copier.