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Hot Roll Fusing System

IP.com Disclosure Number: IPCOM000085176D
Original Publication Date: 1976-Mar-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Gaitten, RE: AUTHOR [+4]

Abstract

In one type of electrostatic copying machine, images are defined on a support sheet by thermoplastic powder toner fixed in place by heat and pressure. The heat and pressure are provided in the form of a hot roll which runs in nip relationship to a backup roll. In practice, the support sheet and thermoplastic toner are passed through the nip defined by the hot roll and backup roll, causing the toner to fuse to the support sheet.

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Hot Roll Fusing System

In one type of electrostatic copying machine, images are defined on a support sheet by thermoplastic powder toner fixed in place by heat and pressure. The heat and pressure are provided in the form of a hot roll which runs in nip relationship to a backup roll. In practice, the support sheet and thermoplastic toner are passed through the nip defined by the hot roll and backup roll, causing the toner to fuse to the support sheet.

In operation, the hot roll-backup roll are normally brought into contact only at the time of fusing, or slightly before. The support sheet running between the pair of rolls tends to act as a heat sink which prevents most of the heat from reaching the backup roll. However, in a system which is designed to handle a support sheet of various lengths, when less than the longest sheet is utilized, the hot roll makes direct nip contact with some portion of the backup roll without the benefit of the heat sink provided by the intervening sheet. The heat transferred to the backup roll must be dissipated in some way or the backup roll will experience a constantly increasing temperature. Such an increased temperature in the backup roll is undesirable, since it affects both the fusing quality and sheet releasability of the system.

A backup roll having thermal properties and heat flow similar to paper is provided to remedy this problem. Such a backup roll is provided in the form of a thick-walled aluminum roll, including heat diss...