Ink Set Suppressing Fringe Effect and Bronzing
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Solution Overview
Problem
Conventional ink sets using clear inks and pigment inks containing carbon black suffer from reduced black density and bronzing resistance due to the 'coloring by fringe' phenomenon, where the interface between the pigment and resin layers causes unwanted reflections, leading to impaired color developability and bronzing resistance.
Innovation Solution
An aqueous ink set comprising a clear ink with resin particles and water-soluble resins, combined with a pigment ink containing water-soluble acrylic and urethane resins, where the carbon black has a specific BET surface area and DBP oil absorption, to form an inner layer that suppresses the fringe effect and enhances wettability, thereby improving color developability and bronzing resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a clear ink containing water-soluble resin is used with pigment ink containing carbon black, then the bronzing phenomenon is suppressed, but coloring by fringe occurs at the interface between pigment and resin layers, impairing black density and color developability
Solution Approach 1:
The invention divides the clear ink into two distinct components: resin particles (0.1-10 μm diameter) and water-soluble resin. This segmentation allows the resin particles to form a reflective layer that suppresses bronzing, while the water-soluble resin penetrates the pigment layer to prevent coloring by fringe, resolving the contradiction between suppressing bronzing and preventing fringe effects
Solution Approach 2:
The clear ink uses a composite system combining resin particles and water-soluble resin together. The resin particles provide the reflective function to suppress bronzing, while the water-soluble resin component provides penetration capability to eliminate coloring by fringe. This composite material approach allows both functions to coexist and resolve the technical contradiction
2Reliability
If conventional clear ink is applied onto pigment ink containing carbon black, then bronzing resistance is improved, but black density in appearance is impaired due to coloring by fringe
Solution Approach 1:
By segmenting the clear ink into resin particles and water-soluble resin, the invention maintains bronzing resistance through the resin particle layer while the water-soluble resin eliminates coloring by fringe, thereby preserving black density and appearance quality
Solution Approach 2:
The invention changes the physical and chemical parameters of the clear ink by introducing resin particles with specific diameter ranges (0.1-10 μm) and combining them with water-soluble resin. This parameter change enables the clear ink to simultaneously achieve bronzing suppression and prevent coloring by fringe, maintaining high black density
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 ink set effectively suppresses the 'coloring by fringe' phenomenon, achieving excellent color developability and bronzing resistance by forming a uniform inner layer that reduces reflections and enhances the permeability of the clear ink into the pigment layer, resulting in high-quality black images.
Implementation Method 1
reflected light by the images, and the light is visually observed as white light... fringe between reflected light from the surface of a pigment layer and reflected light from the surface of a resin layer
Implementation Method 2
a water-soluble acrylic resin and a water-soluble urethane resin... enhances wettability... enhances the permeability of the clear ink into the pigment layer
Data Source
AI summary
Provided is an ink set enabling the recording of images that have excellent color developability and bronzing resistance and have suppressed a coloring by fringe when a clear ink and a pigment ink are used in combination. An aqueous ink set includes a combination of a first ink containing no coloring material and a second ink containing a coloring material.