Browse Prior Art Database

FWSER ROLLS

IP.com Disclosure Number: IPCOM000025296D
Original Publication Date: 1984-Jun-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 67K

Publishing Venue

Xerox Disclosure Journal

Abstract

Historically, pressure fixing of toner materials presents three major problems. First, to enable the toner to adhere to the paper substrate, considerably higher pressures are required than for heated roll fusing. At these pressures, noticeable paper damage is observed. Second, special formulation toners should be used in order to get the toner to cold flow and fix to the paper. Even special toners have only provided barely acceptable fix levels. The third problem is that when the toner is compacted, highly glossed images are obtained.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 73% of the total text.

Page 1 of 2

XEROX DISCLOSURE JOURNAL

FWSER ROLLS Victor Berko-Boatenn -

Rabin Moser

Proposed Classification
W.S. CI. 430/60 Int. C1. G03g 5/04

Historically, pressure fixing of toner materials presents three major problems. First, to enable the toner to adhere to the paper substrate, considerably higher pressures are required than for heated roll fusing. At these pressures, noticeable paper damage is observed. Second, special formulation toners should be used in order to get the toner to cold flow and fix to the paper. Even special toners have only provided barely acceptable fix levels. The third problem is that when the toner is compacted, highly glossed images are obtained.

The addition of a radiant fuser after the pressure fuser has allowed the reduction of the pressure required to fuse the toners to levels where paper calendering is barely noticed. Also, radiant energy improved the fix levels of the toners to acceptable levels. However, the copy quality problem still remains unsolved. We believe that the sleeving of the pressure rolls with certain plastics, specifically a polycarbonate, improves the copy quality drastically to levels comparable to traditional soft roll images. The plastic used provides a surface which conforms to the toner particulate shapes under pressure. Also, the modulus of elasticity of the plastic is sufficiently higher than the toner materials, but less than the unsleeved rolls. The surface of such sleeved rolls are such that it is not susceptible...