Browse Prior Art Database

APPARATUS AND PROCESS FOR COATING PAPER IN A PRINTER

IP.com Disclosure Number: IPCOM000026274D
Original Publication Date: 1991-Feb-28
Included in the Prior Art Database: 2004-Apr-05
Document File: 4 page(s) / 216K

Publishing Venue

Xerox Disclosure Journal

Abstract

It has been a long term objective, in the document field, to design ink jet inks which are compatible with plain paper. Although this is a valid and worthwhile goal there is some doubt if one will ever be able to achieve the kind of pictorial quality with an untreated paper that one could achieve with a treated paper using so-called "plain" paper inks for the following reasons:

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XEROX DISCLOSURE JOURNAL

APPARATUS AND PROCESS FOR COATING PAPER IN A PRINTER Peter M.. Kazmaier
John F. Oliver
Richard E. Sanborn

Proposed Classification
U.S. C1.355/200 Int. C1. G03g 15/00

73

n J

17 4=

15

-

+

'9

-

11

XEROX DISCLOSURE JOURNAL - Vol. 16, No. 1 JanuaryiFebruary 1991 21

[This page contains 1 picture or other non-text object]

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APPARATUS AND PROCESS FOR COATING PAPER IN A PRINTE R(Cont'd)

It has been a long term objective, in the document field, to design ink jet inks which are compatible with plain paper. Although this is a valid and worthwhile goal there is some doubt if one will ever be able to achieve the kind of pictorial quality with an untreated paper that one could achieve with a treated paper using so-called "plain" paper inks for the following reasons:

1. The public benchmark for pictorial images is photographic image quality. This quality is highly dependent upon coating treatment. In contrast pictorial images processed on plain paper are inferior to the benchmark.

2. Paper fiber texture limits the image quality, particularly in terms of colour fidelity.

3. There are a multitude of ink jet image problems in the plain paper field, e.g. feathering, ink mixing, unsaturated colours etc. which despite some improvements in ink design, confine the technology to monochrome and high- light color printing. In printers such as ink jet printers, it may be desirable to employ plain paper for some applications and coated paper for other applications. One solution to this technical problem is to coat plain paper in
situ. This would enable a single paper supply and one could, for example, coat the plain paper in selected areas of a single page; for instance, text areas of a page can be printed directly onto plain paper and a coating can be applied in those areas where graphics will be printed.

An in situ paper treatment composition must satisfy several constraints, not necessarily found in commercial coating facilities:
1. The composition must be non-toxic and preferably nonflammable. Thus water is the preferred liquid coating medium.

2. For in situ paper treatment, the coating and drying time must keep pace with the process speed.

3. The coating composition must be simple to apply and involve simple hardware in order to achieve high quality image reproducibility with a minimum of additional hardware costs
An example of an apparatus suitable for coating plain paper in a printer is illustrated schematically in the above Figure. As shown, the coating apparatus I is situated in a printer so that paper 3 passes through the apparatus 1 via a pair of feed rollers 5 prior to arriving at the printing station. Applicator roll 7 which can have any suitable composition and texture, such as a soft sponge, a metal roller with a textured surface, a wire wound rod, or the like, is in contact with liquid coating material Ssituated in coating reservoir 11 When coated paper is desired, applicator roll 7 is engaged so that it cont...