Recording method, processing solution ink set, and recording device

The recording method enhances color developability on absorbent media by using a treatment liquid with specific 1,2-alkanediol, acetylene glycol-based surfactant, and calcium salt to reduce ink penetration and curling, achieving improved color reproduction.

JP2026143195APending Publication Date: 2026-09-08SEIKO EPSON CORP
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Patent Information

Application Number
JP2025030665
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Filing Date
2025-02-27
Publication Date
2026-09-08

AI Technical Summary

Technical Problem

Inkjet printing on absorbent recording media like plain paper faces challenges with insufficient color developability due to ink penetration, leading to poor color reproduction.

Method used

A recording method involving a treatment liquid containing a 1,2-alkanediol with a surface tension of 30 mN/m or less, an acetylene glycol-based surfactant with an HLB value of 5 or more, and a calcium salt, applied to the recording medium to reduce ink penetration and enhance color development.

Benefits of technology

The method improves color developability by minimizing ink penetration and reducing curling, resulting in better color reproduction on absorbent media.

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Abstract

This invention provides a recording method that improves the color reproduction of printed materials. [Solution] A recording method comprising: a processing liquid adhesion step of ejecting a processing liquid containing a coagulant from an inkjet head and adhering it to a recording medium; and an ink adhesion step of ejecting an ink composition, which is an aqueous ink containing a colorant, from an inkjet head and adhering it to the recording medium, wherein the recording medium is an absorbent recording medium, the processing liquid contains a 1,2-alkanediol with a surface tension of 30 mN / m or less at 25°C and an acetylene glycol-based surfactant with an HLB value of 5 or more, the content of the 1,2-alkanediol is 3% by mass or more of the total amount of the processing liquid, and the coagulant contains a calcium salt, the content of the calcium salt is 5% by mass or more of the total amount of the processing liquid.
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