Heat-Sensitive Recording Material Multilayer Undercoat Structure
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Solution Overview
Problem
Heat-sensitive recording materials face challenges in achieving high recording sensitivity and image quality at low energy while minimizing coating defects and production costs, particularly due to issues with undercoat layer uniformity and thermal insulation.
Innovation Solution
A heat-sensitive recording material with a multilayer undercoat structure and a specific heat-sensitive recording layer thickness standard deviation, formed using a combination of blade and rod coating techniques, which enhances thermal insulation and reduces coating defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a larger coating amount is used to improve thermal insulation and recording sensitivity, then recording sensitivity is improved, but coating uniformity deteriorates and coating defects increase
Solution Approach 1:
The undercoat layer is divided into multiple sub-layers (first undercoat layer, second undercoat layer, and optionally third undercoat layer) with different thicknesses and compositions. This segmentation allows each layer to contribute differently to thermal insulation while maintaining overall coating uniformity, resolving the contradiction between achieving sufficient insulation and preventing coating defects.
Solution Approach 2:
Different regions of the undercoat layer have different properties: the first undercoat layer has higher thickness and porosity for thermal insulation, while the second undercoat layer has lower thickness and better smoothness for coating uniformity. This local differentiation allows simultaneous achievement of thermal insulation and coating quality.
2Productivity
If a single-layer undercoat structure is used to simplify production, then productivity is improved, but thermal insulation performance deteriorates
Solution Approach 1:
The undercoat layer is segmented into multiple functional sub-layers, each optimized for specific purposes (thermal insulation, smoothness, porosity). This segmentation achieves superior thermal insulation performance without significantly complicating the production process, as each layer can be applied using standard coating techniques.
Solution Approach 2:
The undercoat layer uses composite structure with different material compositions in each sub-layer. The first undercoat layer uses high-porosity materials for insulation, while the second undercoat layer uses smoother materials for uniformity. This composite approach enhances thermal insulation while maintaining production efficiency.
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 achieves high recording sensitivity and excellent image quality at low energy with reduced coating defects and improved productivity, addressing the limitations of existing materials.
Implementation Method 1
provide, between a support and a heat-sensitive layer, an undercoat layer in which a pigment and a binder are contained so that voids are formed therein to make it porous or bulky and to thereby impart thermal insulation properties
Data Source
AI summary
The present invention relates to a heat-sensitive recording material having a high recording sensitivity, which is capable of providing excellent image quality even when recording is carried out at low energy, and causes reduced coating defects. The invention provides a heat-sensitive recording material obtained by forming, on a paper support, an undercoat layer and then a heat-sensitive recording layer, characterized in that:1) the undercoat layer has at least two undercoat layers including a first undercoat layer and a second undercoat layer; and2) the heat-sensitive recording layer has a thickness standard deviation of 0.30 or less,and also provides a method for producing the heat-sensitive recording material.