Inkjet-Recording Medium Ink-Receiving Layer Crack Prevention
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Solution Overview
Problem
Current inkjet-recording media face challenges in achieving high drying speed, uniform ink dot diameter, graininess, dot circularity, color density, saturation, light fastness, water resistance, and storage stability, particularly for producing photographic-like high-quality images.
Innovation Solution
An inkjet-recording medium comprising a support with an ink-receiving layer containing inorganic fine particles, a water-soluble aluminum compound, a zirconium compound, a cationic modified self-emulsifying polymer, polyvinyl alcohol with a saponification value of 92 to 98 mol %, and a crosslinking agent, produced using a high-pressure dispersing machine to create a stable and efficient ink-absorbing layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional ink-receiving layer is formed using inorganic fine particles and water-soluble resin, then the basic ink-absorbing function is achieved, but the layer lacks sufficient toughness and cracks during drying
Solution Approach 1:
The patent applies crosslinking agents (boric acid, zinc sulfate, or formalin) to the ink-receiving layer before complete drying occurs. This preliminary crosslinking action strengthens the layer structure during the drying process, preventing cracks from forming while maintaining the layer's ink-absorbing capability.
Solution Approach 2:
The patent creates a composite ink-receiving layer by combining inorganic fine particles (silica, aluminum oxide, titanium oxide) with water-soluble resin (PVA, carboxymethyl cellulose) and crosslinking agents. This composite structure provides both the ink-absorbing properties of inorganic particles and the toughness and crack resistance of the crosslinked resin matrix.
2Speed
If the ink-receiving layer is made highly absorbent to achieve fast drying speed, then drying time is reduced, but the layer becomes too soft and deforms during handling
Solution Approach 1:
The crosslinking agents are applied preliminarily during the drying process to progressively strengthen the layer as moisture evaporates. This timing allows the layer to maintain softness for ink absorption while gradually developing rigidity to prevent deformation during and after drying.
Solution Approach 2:
The patent changes the chemical parameters of the ink-receiving layer by introducing crosslinking agents that form crosslinked structures. This transforms the layer from a soft, highly absorbent state to a more rigid, stable state while maintaining porosity for ink absorption, thus balancing drying speed with structural integrity.
3Ease of manufacture
If conventional materials are used for the ink-receiving layer, then manufacturing is simple, but the printed images show yellowing and bronzing during storage
Solution Approach 1:
The patent uses a composite formulation combining inorganic fine particles, water-soluble resin, and specific crosslinking agents (boric acid, zinc sulfate, or formalin). This composite structure provides resistance to yellowing and bronzing during storage while maintaining manufacturing simplicity through a single-coating process that incorporates all components.
Solution Approach 2:
The patent changes the chemical composition parameters by selecting specific crosslinking agents that provide anti-yellowing and anti-bronzing properties. These chemical modifications enhance storage stability without significantly complicating the manufacturing process, as the crosslinking agents are incorporated into the coating solution.
4Reliability
If the ink-receiving layer is made highly crosslinked to improve water resistance, then water resistance increases, but the layer becomes brittle and loses ink-absorbing capacity
Solution Approach 1:
The patent optimizes the concentration and type of crosslinking agents to achieve a balance between crosslinking density and ink-absorbing capacity. By controlling these parameters, the layer achieves sufficient water resistance while maintaining the porosity and surface properties necessary for ink absorption.
Solution Approach 2:
The composite structure of inorganic fine particles, water-soluble resin, and crosslinking agents creates a balanced system where the inorganic particles provide structural framework and ink-absorbing sites, while the crosslinked resin matrix provides water resistance without excessive brittleness.
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 solution enhances ink-absorbing capacity, prevents cracking and yellowing, and improves water resistance and light stability, resulting in high-quality, photographic-like images with improved storage stability and printing density.
Implementation Method 1
preparing a dispersion by counter-colliding inorganic fine particles and a zirconium compound, or by passing inorganic fine particles and a zirconium compound through an orifice, by using a high-pressure dispersing machine
Implementation Method 2
crosslinking and hardening the coated layer by applying a second liquid containing a zirconium compound and an ammonium salt of weak acid on the coated layer
Implementation Method 3
an ink-receiving layer formed thereon containing inorganic fine particles, a water-soluble aluminum compound, a zirconium compound
Implementation Method 4
high ink-absorbing speed
Data Source
AI summary
An inkjet-recording medium comprising a support and an ink-receiving layer formed thereon containing inorganic fine particles, a water-soluble aluminum compound, a zirconium compound, a cationic modified self-emulsifying polymer, a polyvinyl alcohol having a saponification value of 92 to 98 mol %, and a crosslinking agent, and a method of producing the same.