CONSTANT VISCOSITY LUBRICATING GEL
Original Publication Date: 1997-Apr-30
Included in the Prior Art Database: 2004-Apr-08
Xerox Disclosure Journal
Roll fusers may require application of silicone oil to the surface to minimize sticking of the molten toner to the surface. In theory, the silicone oil forms a thin layer that prevents the toner particles from coming into actual contact with the heated surface. When the copy paper is stripped from the roll surface, splitting of this thin oil layer occurs, providing release of the molten image. In practice, the forming and maintaining of this thin release layer is very difficult because the surface tension of the fuser roll to which it is applied is difficult because the surface tension of the fuser roll to which it is applied is lowered to the point that the oil forms beads. These beads are formed by the oil moving on the surface of the roll. This results in areas of the roll not having a complete release layer and other areas having too much. The incomplete areas will allow offsetting of the toner image to the roll surface. This offset toner will be collected in the applicator wick which reduces its ability to transport oil to the roll surface. Since less oil is being applied to the roll surface, the probability of offset increases. At some point, enough toner can be collected in the wick that it will be smeared back onto the roll surface and then to the copy paper. Toner sticking to the roll surface is detrimental to copy quality and to the long-term operation of the fusing system.