Heat-Sensitive Recording Material Undercoat Layer Optimization
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Solution Overview
Problem
Current heat-sensitive recording materials face challenges in achieving high-density clear images with reduced printing omissions and improved halftone print density, due to insufficient thermal insulation and surface smoothness, particularly with hollow particles of small sizes and non-uniform sizes leading to diffused printing energy and low image quality.
Innovation Solution
Incorporating coarse hollow particles and an inorganic layered compound into the undercoat layer, along with a water retention agent, to enhance thermal insulation and surface smoothness, and using a combination of large and small hollow particles with specific size distributions to improve cushioning and recording density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If small hollow particles (D100: 5.0 μm to 10.0 μm) are used in the undercoat layer, then the undercoat layer can be formed with finer particles, but thermal insulation properties become insufficient causing printing energy diffusion and reduced recording density
Solution Approach 1:
The patent applies local quality by creating two distinct particle size ranges within the hollow particles: a first range (0.1 μm to 10 μm) for maintaining surface smoothness and printing quality, and a second range (10 μm to 100 μm) for providing thermal insulation. This local differentiation of particle sizes within the same layer allows simultaneous optimization of both thermal insulation and surface quality properties.
2Ease of manufacture
If non-uniform particle sizes are used in the undercoat layer, then manufacturing is simplified, but surface smoothness deteriorates leading to printing omissions and reduced image quality
Solution Approach 1:
The patent applies parameter changes by defining specific particle size ranges for hollow particles (D100: 0.1 μm to 100 μm, D50: 0.5 μm to 50 μm) and controlling the ratio between different size fractions. This parameter optimization allows the undercoat layer to achieve both manufacturing ease and surface smoothness by balancing particle size distribution rather than using uniform or completely random sizes.
3Ease of operation
If small hollow particles are used in the undercoat layer, then the coating can be applied more easily, but cushioning properties decrease leading to poor print image quality
Solution Approach 1:
The patent applies composite materials by combining hollow particles of different sizes within a binder resin matrix. The composite structure includes fine hollow particles (0.1 μm to 10 μm) for surface quality and coarser hollow particles (10 μm to 100 μm) for cushioning, creating a multi-functional composite undercoat layer that simultaneously provides coating ease and mechanical cushioning properties.
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 results in clear and high-quality prints with reduced omissions and improved halftone print density by optimizing thermal insulation and surface smoothness, ensuring uniform heat application and enhanced image quality.
Implementation Method 1
the undercoat layer contains hollow particles... improve thermal insulation properties of the undercoat layer
Implementation Method 2
the volume of the resin particles expands by 10 times to 50 times during heating
Data Source
AI summary
Provided is a heat-sensitive recording material that can provide clear and high print image quality with less printing omission, and that has high sensitivity and is excellent in recording density in halftone printing. The heat-sensitive recording material includes an undercoat layer and a heat-sensitive recording layer on a support in this order, in which: the undercoat layer contains hollow particles; the heat-sensitive recording layer contains a leuco dye and a color developer; and the heat-sensitive recording material has one characteristic selected from a group consisting of following (A) to (C): (A) the undercoat layer further contains an adhesive and a water retention agent and a maximum particle size (D100) of the hollow particles is 10 μm to 30 μm; (B) an average particle size (D50) of the hollow particles is 3 μm to 20 μm and the heat-sensitive recording layer further contains an inorganic layered compound; and (C) the undercoat layer further contains an adhesive, the hollow particles include at least two kinds of hollow particles including large particle size hollow particles and small particle size hollow particles, a maximum particle size (D100) of the large particle size hollow particles is 10 μm to 80 μm, an average particle size (D50) of the large particle size hollow particles is 7.5 μm to 25 μm, and an average particle size (D50) of the small particle size hollow particles is 0.7 μm to 6 μm.