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Vapor Applied De-curling Station

IP.com Disclosure Number: IPCOM000131152D
Publication Date: 2005-Nov-08
Document File: 2 page(s) / 20K

Publishing Venue

The IP.com Prior Art Database

Abstract

This disclosure proposes a post fusing subsystem for electrophotographic copying and printing that would selectively apply water vapor to one side of the sheet, where the re-absorption of the water into the paper fibers would expand that side of the sheet and cause it to curl in the opposite direction. The amount of vapor applied, and side to which it is applied would be under process control.

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Vapor Applied De-curling Station

Curled paper is a common result of heat roll fusers of xerographic printers/copiers.  Paper fibers react to the excessive heat in the fuser and produce a curling effect on the paper sheet.  There are de-curling systems available today that pass the fused sheet through a set of rolls to reverse the curl by applying pressure on the paper.

The Vapor Applied De-curling Stationis a mechanical subsystem used to improve the finishing functions in current xerographic systems using a heat roll fuser.  This station applies controlled micro-amounts of vapor to the paper sheet after the fusing process, in order to facilitate the de-curling function, in addition to, or instead of using contacting pressure rolls.  This vapor might be generated as steam, through high pressure atomization, or even by application of micro-drops using thermal (ink) jets.

This disclosure proposes a post fusing subsystem that can be used by itself or in conjunction with a standard decurler (one which operates by pressing the moving sheet between two rollers, one of which has an elastomeric coating, and one of which is hard).  In a standard decurler, the imparted curl is toward the hard roll. 

The proposed subsystem would selectively apply water vapor to one side of the sheet, where the re-absorption of the water into the paper fibers would expand that side of the sheet and cause it to curl in the opposite direction.  The amount of vapor applied, and side to which it is a...