Ink Jet Recording Medium Roller Mark Resistance
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Solution Overview
Problem
Ink jet recording media face issues with roller marks and color unevenness during high-speed printing due to inadequate ink absorption and surface strength, leading to reduced conveying accuracy and image quality.
Innovation Solution
An ink jet recording medium with a substrate and a multi-layer ink receiving layer composed of an upper layer containing 90% alumina hydrate and a lower layer with 20% silica, both incorporating polyvinyl alcohol, which provides enhanced ink absorbency and elasticity to prevent roller marks and color unevenness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If hard conveying rollers are used to improve conveying accuracy, then conveying accuracy is improved, but roller marks are more likely to occur on the recording medium
Solution Approach 1:
The invention changes the surface properties of the recording medium by controlling the ink receiving layer's composition (polyvinyl alcohol content of 12.7% or more) and structure (two-layer configuration with specific pore radii), thereby altering its mechanical parameters to resist roller mark formation while maintaining conveyance accuracy
Solution Approach 2:
The invention uses a composite ink receiving layer structure with two distinct layers: an upper layer containing alumina hydrate particles and a lower layer containing silica particles, both bound with polyvinyl alcohol. This composite structure provides both the hardness needed to resist roller marks and the porosity needed for rapid ink absorption
2Productivity
If high-speed printing is conducted to improve productivity, then productivity is improved, but color unevenness occurs due to insufficient ink absorption
Solution Approach 1:
The invention employs a porous ink receiving layer structure with specifically controlled average pore radii (upper layer: 0.03-0.08 μm, lower layer: 0.05-0.15 μm) to enable rapid ink wicking and absorption, ensuring sufficient ink uptake even during high-speed printing operations
Solution Approach 2:
The invention optimizes the physical and chemical parameters of the ink receiving layer, including porosity, pore size distribution, and polyvinyl alcohol content, to achieve rapid ink absorption kinetics that match high-speed printing requirements while maintaining uniform ink distribution and preventing color unevenness
3Strength
If the ink receiving layer is made harder to prevent roller marks, then resistance to roller marks is improved, but ink absorption capability deteriorates
Solution Approach 1:
The invention applies different properties to different parts of the ink receiving layer: the upper layer has higher alumina hydrate content for surface strength and roller mark resistance, while the lower layer has higher silica content and greater thickness for ink absorption reservoir capacity, creating a functionally differentiated structure
Solution Approach 2:
The invention combines alumina hydrate and silica particles in a two-layer structure bound with polyvinyl alcohol, where the composite material properties provide both the mechanical strength needed to resist roller marks and the porosity needed for rapid ink absorption, resolving the contradiction between hardness and absorbency
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 inhibits roller marks and ensures rapid ink absorption, thereby preventing color unevenness and improving image quality during high-speed printing.
Implementation Method 1
the ink receiving layer composed of the two or more layers contains polyvinyl alcohol in an amount of 12.7% by mass or more based on the total mass of the ink receiving layer composed of the two or more layers
Implementation Method 2
the upper layer...contains a pigment and polyvinyl alcohol, the pigment containing 90% by mass or more of alumina hydrate
Data Source
AI summary
An ink jet recording medium including a substrate and an ink receiving layer provided on the substrate and composed of two or more layers of at least an upper layer and a lower layer. The ink receiving layer contains polyvinyl alcohol in an amount of 12.7% by mass or more based on the total mass of the ink receiving layer. The upper layer is a layer most distant from the substrate, contains a pigment and polyvinyl alcohol, the pigment containing 90% by mass or more of alumina hydrate, and has a thickness of 3.0-10.0 µm. The lower layer is positioned just under the upper layer, contains a pigment and polyvinyl alcohol, the pigment containing 20% by mass or more of silica, and has a thickness 2.5-10 times larger than that of the upper layer and an average pore radius 0.90-1.30 times larger than that of the upper layer.