Ink Jet Recording for High-Density Yellow on Permeable Substrates
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Solution Overview
Problem
Existing ink jet recording methods on permeable substrates, such as decorative paper and high-quality paper, result in low yellow density and decreased jettability due to ink permeation into the substrate, particularly when using Pigment Yellow 110 (PY110), which is exacerbated by the use of permeable substrates.
Innovation Solution
An ink jet recording method involving a pretreatment liquid containing a coagulating agent and specific components applied to the substrate, followed by a yellow ink with a carboxy group-containing resin, organic solvent, and controlled particle size and composition, to enhance yellow density and jettability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a pretreatment liquid containing a coagulating agent is applied onto a permeable substrate before yellow ink application, then yellow density is improved, but the process complexity increases
Solution Approach 1:
The patent applies a pretreatment liquid containing a coagulating agent onto the permeable substrate before yellow ink application. This preliminary action causes the coagulating agent to form a coagulated layer on the substrate surface, which then prevents subsequent yellow ink from permeating into the substrate, thereby improving yellow density without requiring changes to the substrate itself or the ink formulation.
Solution Approach 2:
The coagulating agent in the pretreatment liquid acts as an intermediary layer between the permeable substrate and the yellow ink. This intermediary coagulated layer formed on the substrate surface mediates the interaction between the substrate and ink, preventing direct contact and ink permeation while still allowing for effective yellow color deposition.
2Manufacturing precision
If the ink jet recording system uses standard yellow ink formulation, then jettability is maintained, but yellow density becomes low due to ink permeation
Solution Approach 1:
The patent applies preliminary anti-action by using a coagulating agent in the pretreatment liquid that actively counteracts the ink permeation tendency before the yellow ink is applied. The coagulating agent creates a resistant layer on the substrate surface that preemptively blocks the ink from penetrating into the substrate, thereby preventing the harmful permeation effect rather than trying to correct it after the fact.
3Manufacturing precision
If the coagulating agent application amount is increased to improve yellow density, then image quality improves, but cost and material usage increase
Solution Approach 1:
The patent optimizes the application amount of the coagulating agent to achieve the minimum effective concentration needed to form a sufficient coagulated layer on the substrate surface. By carefully controlling this parameter, the patent achieves high yellow density while minimizing coagulating agent usage, avoiding both under-application (which would fail to prevent permeation) and over-application (which would waste material).
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method achieves high yellow density and excellent jettability by suppressing ink permeation and aggregate formation, resulting in improved image quality and reduced color unevenness.
Implementation Method 1
a pretreatment liquid which contains at least one coagulating agent selected from the group consisting of an organic acid having a molecular weight of less than 1000 and a polyvalent metal salt
Implementation Method 2
an organic solvent having a boiling point of 250°C or higher
Data Source
Figure 1
AI summary
Provided is an ink jet recording method in which an image has a high yellow density and jettability of an ink is excellent. The ink jet recording method includes: a step of applying, onto a permeable substrate having an air permeability resistance of 5 seconds to 50 seconds according to a Gurley method, a pretreatment liquid which contains at least one coagulating agent selected from the group consisting of an organic acid having a molecular weight of less than 1000 and a polyvalent metal salt, and water; and a step of applying a yellow ink onto a region of the permeable substrate, onto which the pretreatment liquid has been applied, by an ink jet recording system, in which the yellow ink contains water, an organic solvent having a boiling point of 250°C or higher, C. I. Pigment Yellow 110, and a carboxy group-containing resin DY, and a content of the organic solvent having a boiling point of 250°C or higher is 15% by mass to 40% by mass with respect to a total amount of the yellow ink.