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HYBRID COLD PRESSURE RADIANT FUSING SYSTEM

IP.com Disclosure Number: IPCOM000027793D
Original Publication Date: 1999-Oct-31
Included in the Prior Art Database: 2004-Apr-09
Document File: 2 page(s) / 63K

Publishing Venue

Xerox Disclosure Journal

Abstract

Disclosed are two, rigid, low-temperature rollers forming a high-pressure nip. The rollers are kept at a minimum temperature low enough to prevent coalescence of toner in contact with their surface. No release agent is necessary. Tests were successfully conducted both with and without release agent. The release agent may provide a marginal increase in latitude. The rollers used in the test were uncoated steel rolls. However, a variety of roll materials and the surfaces could be used. The nip must be of sufficient pressure to compact the toner. If the toner is not sufficiently compacted, the toner layer may separate at the nip resulting in offset onto the pressure roll. If the pressure is too high, then the paper may be compacted, changing the texture and feel of the paper. Therefore, accurate control of the nip pressure is important. After the toner is compacted in the high-pressure nip, the image is heated radiantly. As a result, the toner coalesces and fully bonds to itself and to the paper.

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XEROX DISCLOSURE JOURNAL

HYBRID COLD PRESSURE RADIANT FUSING SYSTEM U. S. C1.399/320 Derek E. Vaughan
Anthony S. Condello
Rabin Moser

Proposed Classification

Int. C1. G03g 15/20

Disclosed are two, rigid, low-temperature rollers forming a high-pressure nip. The rollers are kept at a minimum temperature low enough to prevent coalescence of toner in contact with their surface. No release agent is necessary. Tests were successfully conducted both with and without release agent. The release agent may provide a marginal increase in latitude. The rollers used in the test were uncoated steel rolls. However, a variety of roll materials and the surfaces could be used. The nip must be of sufficient pressure to compact the toner. If the toner is not sufficiently compacted, the toner layer may separate at the nip resulting in offset onto the pressure roll. If the pressure is too high, then the paper may be compacted, changing the texture and feel of the paper. Therefore, accurate control of the nip pressure is important. After the toner is compacted in the high-pressure nip, the image is heated radiantly. As a result, the toner coalesces and fully bonds to itself and to the paper.

During the initial compaction of the toner, the surface of the toner is smoothed. Consequently, the gloss of the hybrid-fused image is about 30 gloss units higher than an image that was only radiantly fused under identical conditions.

During the cold pressure phase, the toner is compacted, and is th...