Inkjet Recording Medium Ink-Receiving Layer Composition
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Solution Overview
Problem
The existing inkjet recording methods face challenges in achieving high ink discharging properties, drying properties, fixing properties, printing density, and glossiness, especially when using pigment ink on low absorption coated papers like offset coat paper, due to poor interaction between ink and the paper's ink-receiving layer.
Innovation Solution
An inkjet recording method utilizing an inkjet recording medium with a specific ink-receiving layer containing calcium carbonate, starch, and copolymer latex, and inkjet ink with water-insoluble polymer particles and solvents with boiling points of 230 °C or less, which enhances ink viscosity and absorption, leading to improved printing quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pigment ink is used on low absorption coated paper, then colorfastness and weatherability are improved, but ink discharging properties and drying speed deteriorate
Solution Approach 1:
The patent introduces a specifically designed ink-receiving layer as an intermediary between the low absorption coated paper and the pigment ink. This layer contains calcium carbonate, starch, and copolymer latex in specific ratios, creating a surface that actively receives and absorbs the ink while the underlying paper remains unchanged. The ink-receiving layer mediates the interaction, enabling both good colorfastness and acceptable drying speed.
Solution Approach 2:
The patent modifies the surface properties of the recording medium by changing the composition parameters of the ink-receiving layer. By controlling the content ratios of calcium carbonate (10-50 parts), starch (3-15 parts), and copolymer latex (7-20 parts), the ink reception and drying characteristics are optimized. This parameter adjustment allows the system to achieve both colorfastness and drying performance.
2Reliability
If ink-receiving layer is added to base, then ink absorption and fixing properties are improved, but device complexity increases
Solution Approach 1:
The ink-receiving layer is pre-formed on the base paper before printing occurs. This preliminary preparation ensures that the surface is ready to receive and fix the pigment ink effectively. The layer contains all necessary components (calcium carbonate, starch, copolymer latex) in the correct proportions before the printing process begins, eliminating the need for complex real-time adjustments during printing.
Solution Approach 2:
The ink-receiving layer is constructed as a composite material combining calcium carbonate (for ink reception and texture), starch (for binding and absorption), and copolymer latex (for adhesion and durability). This composite structure provides synergistic effects, where each component contributes specific properties that together achieve excellent fixing performance without requiring overly complex structural designs.
3Productivity
If high speed printing is performed, then productivity is improved, but ink drying load increases and quality deteriorates
Solution Approach 1:
The ink-receiving layer is pre-configured with optimal composition ratios of calcium carbonate, starch, and copolymer latex to handle high-speed printing conditions. This preliminary preparation ensures that even when ink is deposited rapidly during high-speed printing, the layer can immediately begin the absorption and drying process, maintaining print quality without requiring slower printing speeds.
Solution Approach 2:
The patent adjusts the compositional parameters of the ink-receiving layer to optimize performance under high-speed printing conditions. By controlling the specific ratios of calcium carbonate (10-50 parts), starch (3-15 parts), and copolymer latex (7-20 parts), the layer's absorption rate and drying characteristics are tuned to match high-speed printing demands, preventing quality deterioration even at elevated printing speeds.
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 ink discharging properties, excellent drying and fixing properties, high printing density, and a glossy offset printing type texture, enabling efficient high-speed printing on low absorption papers.
Implementation Method 1
it is known that a liquid component is absorbed slowly, drying takes a time
Implementation Method 2
When the low absorption recording medium is printed by the inkjet recording method, it is known that a liquid component is absorbed slowly
Implementation Method 3
from 10 % by weight or more to 48 % by weight or less of a water-soluble organic solvent A having a boiling point of 230 °C or less
Data Source
AI summary
An inkjet recording method for printing an inkjet recording medium comprising an ink-receiving layer containing inorganic pigment, starch and copolymer latex on a surface of a base with inkjet ink as aqueous pigment ink, a content of the inorganic pigment being 10 g/m2 or more to 35 g/m2 or less in the ink-receiving layer,and a content of calcium carbonate being from 80 % by weight or more to 100 % by weight or less, the inkjet ink containing one or more selected from self dispersed pigment and pigment containing water-insoluble polymer particles, from 10 % by weight or more to 48 % by weight or less of a water-soluble organic solvent A having a boiling point of 230 °C or less, from 0 % by weight or more to 5.0 % by weight or less of a water-soluble organic solvent B having a boiling point of 280 °C or more, from 42 % by weight or more to 70 % by weight or less of water.