Inkjet Media Complex for High Gloss Image Quality
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Solution Overview
Problem
Existing inkjet printing systems face challenges with pigment-based inks, particularly in achieving high gloss and preventing coalescence and mottle, as the addition of multivalent metal cations can lead to a severe loss of gloss in glossy photo-quality media.
Innovation Solution
A system comprising a printer, a pigment ink composition, and a dry recording media with an ink-receiving layer containing a complex of polyvalent metal cations and ligands, where the stability constant of the complex is between 0.3 and 6.0, reducing coalescence and mottle while maintaining high gloss and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multivalent metal cations are added to prevent coalescence and mottle, then ink absorption and color density improve, but gloss is severely reduced
Solution Approach 1:
The patent changes the chemical parameters of the metal cation system by selecting specific multivalent metal cations (Al³⁺, Fe³⁺, Cr³⁺, Zn²⁺, Mn²⁺, Co²⁺, Ni²⁺, Cu²⁺) and controlling their concentration ranges (0.1-10 mmol/m²) to achieve optimal balance between coalescence prevention and gloss maintenance. This parameter optimization resolves the contradiction by finding the precise concentration window where both image quality and gloss are maximized.
Solution Approach 2:
The patent employs composite ink-receiving layers combining multiple functional components: multivalent metal cations for coalescence prevention, hydrophilic polymers for ink absorption, and hydrophobic polymers for gloss enhancement. This composite structure allows simultaneous achievement of high image quality and high gloss by distributing functions across different material components rather than relying on a single additive.
2Productivity
If base layer coating weight is reduced to improve manufacturing efficiency, then productivity and energy savings improve, but ink absorption capacity may be insufficient
Solution Approach 1:
The patent optimizes the base layer coating weight to specific ranges (1-10 g/m² for porous layers, 0.1-5 g/m² for non-porous layers) and adjusts the porosity parameter (20-80% for porous layers) to maintain adequate ink absorption capacity while reducing material consumption and manufacturing costs. This parameter optimization enables thinner, more efficient base layers that still provide sufficient ink holding capacity.
Solution Approach 2:
The patent utilizes porous ink-receiving layers with controlled porosity (20-80%) and pore structures to enhance ink absorption capacity per unit weight. The porous structure provides high surface area and capillary action for efficient ink uptake, allowing reduced coating weight while maintaining or improving ink absorption performance. This resolves the contradiction by making the base layer more efficient rather than simply thicker.
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 effectively reduces coalescence and mottle, maintains high gloss, and achieves excellent image quality with pigment-based inks on glossy photo-quality media, even with reduced base layer coating weight, offering improved manufacturing efficiency and energy savings.
Implementation Method 1
an ink-receiving layer containing a complex of polyvalent metal cations and ligands, where the stability constant of the complex is between 0.3 and 6.0
Implementation Method 2
the printing liquid is absorbed into the open interconnected pores of the IRL, substantially by capillary action
Implementation Method 3
a non-porous coating of a polymer with a high capacity for swelling, which non-porous coating absorbs ink by molecular diffusion
Implementation Method 4
the dyes generally comprise anionic moieties and are known to complex with suitable cationic species, thus binding the dye near the surface
Data Source
AI summary
An inkjet printing system, comprises: a printer, a pigment ink composition, and a dry recording media supply for receiving ink, the media comprising a support bearing an ink-receiving layer containing a complex of a polyvalent metal cation and a ligand, wherein the complex has a stability constant, K1, in the range of 0.3 to 6.0. The system gives images with excellent gloss, coalesence, and image quality.