Thermal Transfer Recording Medium Welding Layer Solubility
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Solution Overview
Problem
Existing thermal transfer recording media struggle to record characters in at least two colors with good clarity, often resulting in cloudy hues due to the wide cloudy transfer range and narrow low-temperature transfer range.
Innovation Solution
A thermal transfer recording medium is introduced, comprising a base material layer, a welding layer with a higher solubility parameter than the base material and first thermal transfer layer, and two thermal transfer layers. This configuration allows for clear separation of colors and improved clarity during continuous thermal transfer recording.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a thermal transfer recording medium uses a conventional layered structure without a welding layer, then the device complexity is reduced, but the manufacturing precision and clarity of multi-color characters deteriorate due to wide cloudy transfer range
Solution Approach 1:
The patent segments the thermal transfer recording medium into distinct functional layers: a base material layer, a welding layer with specific solubility parameter, and multiple thermal transfer layers with different colors. This segmentation allows each layer to perform its specific function independently, enabling clear multi-color character recording by controlling which layers transfer at different temperatures.
Solution Approach 2:
The welding layer is designed with a specific local quality - its solubility parameter is higher than that of the base material layer and first thermal transfer layer. This local quality difference creates a controlled interface that enables precise separation of color layers during thermal transfer, improving manufacturing precision without requiring complex overall device structure.
2Manufacturing precision
If the thermal transfer recording medium uses a welding layer with higher solubility parameter, then the manufacturing precision and color separation improve, but the ease of manufacture deteriorates due to stricter material selection requirements
Solution Approach 1:
The patent applies parameter changes by specifying that the welding layer must have a solubility parameter higher than both the base material layer and the first thermal transfer layer. This parameter specification creates a clear design criterion that guides material selection and ensures consistent color separation performance while simplifying the manufacturing process through standardized material properties.
3Reliability
If conventional thermal transfer media are used without optimized layer structure, then the ease of operation is maintained, but the reliability of continuous thermal transfer recording deteriorates due to excessive peeling
Solution Approach 1:
The welding layer is prepared in advance during the manufacturing process with its specific solubility parameter higher than adjacent layers. This preliminary action ensures that during continuous thermal transfer recording operations, the layers will separate cleanly without excessive peeling, improving reliability without requiring the operator to do anything special.
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 proposed solution enables clear separation of colors with little cloudiness, achieving excellent clarity and reducing excessive peeling, even during continuous thermal transfer recording, using a general-purpose thermal transfer printer.
Implementation Method 1
The welding layer has an SP value higher than a solubility parameter (SP value) of each of the base material layer and the first thermal transfer layer
Implementation Method 2
By adjusting the amount of applied energy directed to a thermal head in the printing device, the device can transfer characters of different colors onto a printing medium
Data Source
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AI summary
There is provided a thermal transfer recording medium capable of recording characters in at least two colors with good clarity. The thermal transfer recording medium 47 includes: a base material layer 48; a welding layer 70; a first thermal transfer layer50; an intermediate layer 51; and a second thermal transfer layer 52. The base material layer 48 has a front surface 53 and a back surface 54. The welding layer 70, the first thermal transfer layer 50, the intermediate layer 51, and the second thermal transfer layer 52 are in direct contact with each other and are laminated in this order on the front surface 53 of the base material layer 48. The welding layer 70 has a solubility parameter (SP value) than a solubility parameter (SP value) of each of the base material layer 48 and the first thermal transfer layer 50.