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TRANVERSE DIMENSION CONTROL IN MULTI-PASS COLOR RECORDING

IP.com Disclosure Number: IPCOM000025406D
Original Publication Date: 1985-Apr-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 69K

Publishing Venue

Xerox Disclosure Journal

Abstract

In multiple pass color recording on coated or uncoated paper, it is crucial to achieve dot-on-dot registration in order to get accurate color rendition, especially if the colored marking materials are not perfectly transparent. Accurate registration in the process (paper travel) direction is readily achieved by using marks or perforations along the edges of the web. A lesser, but still significant, problem is achieving good registration across the web (transverse to the paper travel) as the paper width varies in response to moisture changes in the web. If the ambient humidity is significantly different from the inherent paper effective humidity, the moisture level of the paper may either increase or decrease during the processing time of the multi-pass recording. What is needed is a method of rapidly equilibrating the paper with ambient humidity conditions.

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XEROX DISCLOSURE JOURNAL

MULTI-PASS COLOR RECORD: Gene Franklin Day

In multiple pass color recording on coated or uncoated paper, it is crucial to achieve dot-on-dot registration in order to get accurate color rendition, especially if the colored marking materials are not perfectly transparent. Accurate registration in the process (paper travel) direction is readily achieved by using marks or perforations along the edges of the web. A lesser, but still significant, problem is achieving good registration across the web (transverse to the paper travel) as the paper width varies in response to moisture changes in the web. If the ambient humidity is significantly different from the inherent paper effective humidity, the moisture level of the paper may either increase or decrease during the processing time of the multi-pass recording. What is needed is a method of rapidly equilibrating the paper with ambient humidity conditions.

Moisturizing the paper in order to equilibrate it with a higher ambient humidity is difficult. However, drying it out is relatively easy. Fortunately, by far the worst conditions occur when ambient humidity is lower than the equilibrated humidity of the paper. That is, most of the problems occur when the paper "dries out" during the image processing. Bringing the paper web down to the appropriate moisture content can easily be achieved with gentle heating. By passing the paper over a hot roller (or hot shoe) its moisture content can be brought...