Incremental printing of symbolic information – Ink jet – Medium and processing means
Reexamination Certificate
1998-08-17
2001-03-06
Braun, Fred L. (Department: 2852)
Incremental printing of symbolic information
Ink jet
Medium and processing means
Reexamination Certificate
active
06196674
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an ink jet recording method wherein a first liquid and an ink composition are deposited onto a recording medium to conduct printing, and a recording apparatus for use in the ink jet recording method.
2. Background Art
An ink jet recording method is a printing method wherein droplets of an ink composition are ejected and deposited onto a recording medium such as paper. This method can realize an image having high resolution and high quality at a high speed with a relatively inexpensive apparatus. In general, the ink composition used in the ink jet recording contains water as a main component and, added thereto, a colorant and a wetting agent such as glycerin added for prevention of clogging and other purposes.
On the other hand, a new ink jet recording method has been recently proposed which comprises applying a polyvalent metal salt solution onto a recording medium and then applying an ink composition containing a dye material having at least one carboxyl group (see, e.g., Japanese Patent Laid-Open No. 202328/1993). According to this method, polyvalent metal ions combine with the dye to form an insoluble composite which can provide an image having water resistance and high quality free from color bleeding.
Further, an ink jet recording method has been proposed wherein a color ink containing at least a surfactant or a penetrable solvent and a salt for imparting a penetrating property is used in combination with a black ink which cooperates with the salt to cause thickening or coagulation. This method provides a high-quality color image having high image density and free from color bleeding (Japanese Patent Laid-Open No. 106735/1994). More specifically, in this method, two liquids, i.e., a first liquid containing a salt and a second liquid of an ink composition, are printed to provide a good image.
Furthermore, other ink jet recording methods wherein two liquids are printed have been proposed, for example, in Japanese Patent Laid-Open No. 240557/1991 and No. 240558/1991.
SUMMARY OF THE INVENTION
The present inventors have now found that, in the above ink jet recording method wherein two liquids are printed, the deposition of a first liquid onto a recording medium through an intermediate transfer medium can provide a good image. The present invention has been made based on such finding.
Accordingly, an object of the present invention is to provide an ink jet recording method, capable of forming a good image, which comprises printing two liquids.
According to one aspect of the present invention, there is provided an ink jet recording method wherein a first liquid containing a reactant and an ink composition are deposited onto a recording medium,
said method comprising the steps of:
depositing the first liquid onto an intermediate transfer medium;
transferring the first liquid deposited onto the intermediate transfer medium onto the recording medium; and
ejecting droplets of the ink composition onto the recording medium to record an image.
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Braun Fred L.
Ladas and Parry
Seiko Epson Corporation
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