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Browse Prior Art Database

Three-Stage Preclean Treatment

IP.com Disclosure Number: IPCOM000039874D
Original Publication Date: 1987-Aug-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 2 page(s) / 65K

Publishing Venue

IBM

Related People

Adley, JM: AUTHOR [+2]

Abstract

This article relates to the pretreatment of residual toner in an electrophotographic (EP) process prior to cleaning. The concept is to provide a uniform electrostatic charge on the toner particles for removal in an electrostatic cleaner as implemented in a two-cycle EP process or a separate magnetic brush cleaner in single-cycle EP process. This is achieved by exposing the toner to a corona of opposite charge polarity to force all particles to one charge polarity, an erase lamp to discharge the surrounding photoconductor, and finally a corona of correct polarity and optimal charge current to cause all of the toner to assume a uniform charge-to-mass ratio. (Image Omitted) Fig.

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Three-Stage Preclean Treatment

This article relates to the pretreatment of residual toner in an electrophotographic (EP) process prior to cleaning. The concept is to provide a uniform electrostatic charge on the toner particles for removal in an electrostatic cleaner as implemented in a two-cycle EP process or a separate magnetic brush cleaner in single-cycle EP process. This is achieved by exposing the toner to a corona of opposite charge polarity to force all particles to one charge polarity, an erase lamp to discharge the surrounding photoconductor, and finally a corona of correct polarity and optimal charge current to cause all of the toner to assume a uniform charge-to-mass ratio.

(Image Omitted)

Fig. 1 illustrates a conventional preclean treatment which uses an erase light and a corona to pretreat the toner remaining after transfer in order to facilitate removal at a cleaning station. The developed toner charge distribution (step 1) is typically narrow and of correct polarity. The residual toner after transfer has a broader charge distribution (step 2) which can be attributed to charge exchange or to paper charge bleed through at transfer, and may even be bipolar. The function of cleaning pretreatment is to insure that all toner particles have the correct charge polarity for electrostatic cleaning but not so high as to cause the image adhesion force to be greater than the cleaning force. Electrostatic cleaning requires that all particles have a uniform, correct, charge to control the particle removal with electric fields in the cleaner. This is less of a problem in fiber brush cleaners where mechanical sheer forces can clean particles which have little or no charge. Control of the charge distribution is difficult to achieve since the post transfer toner charge distribution is not only broad but is variable depending upon the events at transfer. Therefore, there is no o...