Recording Medium Ink Receiving Layer Gloss Bronzing
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Solution Overview
Problem
Recording media with luster surfaces suffer from bronzing and insufficient optical density due to ink penetration into concave portions, and existing technologies fail to effectively suppress glossiness while maintaining high-grade texture.
Innovation Solution
A recording medium with an ink receiving layer containing inorganic particles and a surface featuring specific-sized openings to absorb ink, preventing it from remaining in concave portions, which includes a base with a polyolefin resin coating and a controlled arithmetic mean roughness of 0.8 µm or more.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the surface roughness is increased to suppress glossiness and provide a luster surface, then the surface texture is improved, but ink penetrates into the concave portions causing bronzing and insufficient optical density
Solution Approach 1:
The patent applies porous inorganic particles (such as silica or alumina) with specific pore structures to the ink receiving layer. These particles have controlled pore sizes and distributions that allow them to absorb excess ink through capillary action while preventing ink from penetrating into the concave portions of the rough surface. The porous structure provides high surface area for ink absorption without creating deep penetration paths, thus suppressing glossiness while preventing bronzing and maintaining optical density.
Solution Approach 2:
The patent uses composite materials combining organic binders with inorganic particles (such as silica, alumina, or titania) in the ink receiving layer. This composite structure provides both the roughness needed for gloss suppression and the controlled absorption properties to prevent ink penetration into concave portions. The inorganic particles provide rigidity and absorption capacity while the organic binder holds the structure together, achieving both luster surface and bronzing prevention.
2Shape
If the surface roughness is increased to provide a luster surface, then the texture quality is improved, but the optical density of the recorded image becomes insufficient
Solution Approach 1:
The porous inorganic particles in the ink receiving layer provide controlled absorption of ink through their pore structures. The pores have specific size ranges that allow them to absorb sufficient ink quantity to maintain optical density while preventing uncontrolled penetration into the substrate. The high surface area of porous particles increases absorption capacity without requiring deep penetration, thus maintaining both surface texture and optical density.
Solution Approach 2:
The patent carefully controls the parameters of the ink receiving layer including particle size distribution, pore size, porosity, and layer thickness. By optimizing these parameters, the layer achieves the right balance between absorbing enough ink to maintain optical density and preventing excessive absorption that would reduce image quality. The arithmetic mean roughness is specifically controlled within certain ranges to achieve the desired texture while maintaining sufficient optical density.
3Illumination intensity
If the surface is roughened to suppress glossiness, then the luster surface effect is achieved, but ink absorption becomes excessive causing image quality degradation
Solution Approach 1:
The porous inorganic particles provide controlled ink absorption through their pore structures. The pore sizes are specifically designed to absorb excess ink through capillary action without allowing uncontrolled penetration. This controlled absorption mechanism prevents excessive ink loss while maintaining the rough surface texture needed for gloss suppression, thus resolving the contradiction between luster surface effect and ink absorption control.
Solution Approach 2:
The ink receiving layer with porous particles is applied specifically to the surface region where ink contact occurs, while the underlying substrate maintains its roughness structure. This localized application of the porous layer provides controlled absorption at the ink-receiving interface without requiring the entire substrate to have uniform properties, allowing gloss suppression through surface roughness while controlling ink absorption through the porous layer's selective absorption characteristics.
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 prevents bronzing and achieves high optical density by ensuring ink absorption, maintaining a luster surface with controlled surface roughness and ink absorbability, while avoiding excessive ink penetration.
Implementation Method 1
an ink receiving layer which contains inorganic particles and has a plurality of openings formed therein; wherein the arithmetic mean roughness of a surface of the recording medium is 0.8 μm or more in accordance with JIS B 0601:2001
Implementation Method 2
the ink receiving layer... to absorb ink, preventing it from remaining in concave portions
Data Source
Figure 1~2C
AI summary
A recording medium includes a base and an ink receiving layer. The ink receiving layer contains inorganic particles. The surface of the recording medium has an arithmetic mean roughness of 0.8 µm or more in accordance with JIS B 0601:2001. The surface of the recording medium includes openings having a width of 30 µm or less and a length of 500 µm or less. The number of the openings is 5 or more and 30 or less per 1 mm2 of the surface of the recording medium.