Ink set and inkjet recording method

Abstract

The present invention provides an ink set, an inkjet recording method, an ink cartridge, a recording unit, an inkjet recording apparatus, and an aqueous ink. Provided is an ink set that can suppress bleeding regardless of the type of recording medium. The set of inks includes a plurality of aqueous inks each comprising a dye, and at least has a first aqueous ink comprising a dye, wherein the dynamic surface tension of the first aqueous ink at a lifetime of 50 milliseconds and the dynamic surface tension of the first aqueous ink at a lifetime of 500 milliseconds The difference between the surface tensions is 7 mN / m or more; and, between the first aqueous ink and at least one aqueous ink other than the first aqueous ink contained in the set of inks, relatively high brightness The dynamic surface tension γa (mN / m) of ink A at a life of 500 milliseconds and the dynamic surface tension γb (mN / m) of ink B with a relatively low brightness at a life of 500 milliseconds satisfy -5≤(γa-γb)≤ 3.

Description

technical field [0001] The present invention relates to an aqueous ink, an ink set, an inkjet recording method, an ink cartridge, a recording unit, and an inkjet recording apparatus. Background technique [0002] In recent years, it has been required to improve the quality of images formed by inkjet recording methods on recording media, especially plain paper, specifically, the gradation or color uniformity of images. For example, gradation can be improved by reducing the area of ​​a single dot formed of ink on a recording medium. On the contrary, when the area of ​​the single dot is large, a plurality of dots tend to be connected to each other, so even when the amount of ink applied per unit area is increased or decreased, it may not be possible to accurately control the amount of ink coated. The surface area of ​​the recording medium. In addition, a plurality of dots tend to be joined to each other, so sometimes blurring of ink tends to occur on the recording medium. ...

AI Technical Summary

Problems solved by technology

On the contrary, when the area of ​​the single dot is large, a plurality of dots tend to be connected to each other, so that even when the amount of ink applied per unit area is increased or decreased, it may not be possible to accurately control the amount of ink coated. The surface area of ​​the recording medium

In addition, a plurality of dots tend to be linked to each other, so sometimes blurring of ink tends to occur on the recording medium.

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