FOAM DISPENSING ROLL
Original Publication Date: 1982-Aug-31
Included in the Prior Art Database: 2004-Apr-04
Xerox Disclosure Journal
As successive copies are made in an electrophotographic printing machine, toner particles are depleted from the development system. Various schemes have been devised to replenish the toner particles. One type of toner dispensing system employs a foam roller to discharge toner particles from a container into the developer material. It has been found that toner particles migrate into the pore structure of the foam roller. This leads to a change in dispensing rate and ultimately to failure of the system. To overcome this problem, a release coating is applied to the foam roller. Toner particles are easily released from the coated foam roller which further helps to seal the pores of the foam slowing down or eliminating the toner particle migration into the foam pores. Suitable materials for coating the foam roller are Teflon, polyethylene or other low friction materials. A fluorocarbon release agent may also be employed. The coating may be plasma sprayed onto the surface of the roll.