Thermal Recording Sheet Transparency and Head Protection
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Solution Overview
Problem
Existing thermal recording sheets face challenges in recognizing both printed and typed contents from the front surface side due to the concealment of the thermal recording layer by the printed layer, leading to difficulties in head adjustment and potential contamination of the thermal head, especially when using metal-containing ink.
Innovation Solution
A thermal recording sheet configuration with a recording layer on the front surface, a protective layer on top, and a printed layer on the back surface, utilizing an intermediate layer with core shell-type particles and colloidal silica to suppress irregular reflections and maintain transparency, allowing both typed and printed contents to be visible from the front side without direct contact with the thermal head.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a printed layer is formed on the front surface side of a thermal recording layer, then both printed and typed contents can be recognized from the front surface side, but the thermal recording layer is concealed by the printed layer causing typing failures
Solution Approach 1:
The patent moves the printed layer from the front surface to the back surface of the thermal recording sheet, changing its spatial position. This allows the printed layer to no longer conceal the thermal recording layer during typing operations, while still enabling visibility of both printed and typed contents from the front surface through the transparent thermal recording layer.
2Shape
If a printed layer is formed on the front surface, then design features and metal gloss can be achieved, but the thermal head is contaminated or fails due to contact with metal-containing ink
Solution Approach 1:
The patent introduces a transparent thermal recording layer as an intermediary between the thermal head and the printed layer. This intermediary layer prevents direct contact between the thermal head and metal-containing ink, eliminating contamination and failure issues while preserving the design features and metal gloss of the printed layer.
3Loss of information
If the printed layer and typing area are formed in separate areas to avoid concealment, then both printed and typed contents can be recognized, but a step is generated between areas causing head adjustment difficulties
Solution Approach 1:
The patent resolves the step issue by moving the printed layer to the back surface, allowing the typing area to extend across the entire front surface without creating thickness variations. This maintains a flat surface for easy thermal head adjustment while enabling full-area typing with visibility of printed contents through the transparent layer.
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
Enables clear recognition of both thermal recording and printed contents from the front surface, preventing thermal head contamination and ensuring smooth typing operations even with metal-containing inks, while maintaining transparency and design features.
Implementation Method 1
a recording layer formed on the front surface side of the substrate layer and containing a color developing material that develops color by heating
Implementation Method 2
the recording layer contains a first irregular reflection suppression component for suppressing irregular reflection in the substrate layer, the recording layer, the intermediate layer, and the protective layer
Implementation Method 3
the intermediate layer contains a second irregular reflection suppression component for suppressing irregular reflection in the substrate layer, the recording layer, the intermediate layer, and the protective layer
Implementation Method 4
the protective layer contains a binder and a filler, the filler contains colloidal silica
Data Source
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AI summary
[Problems] Provided is a thermal recording sheet in which both a thermal recording layer having developed color and a printed layer can be clearly recognized from the front surface side of the sheet. [Solution] A thermal recording sheet having a front surface and a back surface opposite the front surface includes: a substrate layer; a recording layer formed on the front surface side of the substrate layer and containing a color developing material that develops color by heating; a protective layer formed on the further front surface side of the recording layer; and a printed layer formed on the back surface side of the recording layer. In a state before the recording layer develops color, a portion containing the recording layer and the protective layer and formed on the front surface side to the printed layer is transparent.