Luster Pigment Thermal Transfer Layer for Brightness and Durability
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Solution Overview
Problem
Existing thermal transfer sheets using luster pigments produce printed materials with inferior durability and image visibility compared to common printed materials, and have lower transferability.
Innovation Solution
A thermal transfer sheet with a substrate and a transfer layer containing luster pigment, where the ratio of black to white areas and the average area of black portions are controlled to enhance brightness, durability, and transferability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a thermal transfer sheet with luster pigment is used to produce high-brightness printed materials, then brightness is improved, but durability and image visibility deteriorate
Solution Approach 1:
The patent applies parameter changes by precisely controlling the area ratio of light portions (0.03-0.5) and average area of dark portions (100-300 μm²) in the luster pigment layer. This quantitative control of structural parameters enables simultaneous achievement of high brightness and durability, resolving the contradiction between visual effect and material reliability
Solution Approach 2:
The patent uses composite materials by combining luster pigment with specific resin materials in the transfer layer. The composite structure of pigment particles dispersed in resin matrix provides both the desired optical properties (brightness) and mechanical properties (durability), resolving the contradiction between appearance quality and material reliability
2Illumination intensity
If a thermal transfer sheet with luster pigment is used to produce high-brightness printed materials, then brightness is improved, but transferability deteriorates
Solution Approach 1:
The patent applies parameter changes by optimizing the area ratio of light portions (0.03-0.5) and average area of dark portions (100-300 μm²) in the luster pigment layer. This quantitative control of structural parameters enables simultaneous achievement of high brightness and durability, resolving the contradiction between visual effect and material reliability
Solution Approach 2:
The patent uses intermediary materials by introducing specific resin materials as binding agents in the transfer layer. These resin intermediaries facilitate the transfer process by providing adhesion and flexibility, enabling the luster pigment layer to be transferred effectively while maintaining brightness, thus resolving the contradiction between optical performance and transferability
Data Source
AI summary
The present disclosure is a thermal transfer sheet including a substrate and a transfer layer, the transfer layer containing a luster pigment, wherein, when an image of the sheet is taken from a side on which the transfer layer is present, the image is analyzed, dark and light portions of the analyzed image are inverted, automatic thresholding is performed in order to determine a threshold value of a brightness distribution, binary representation is subsequently performed, and the number and the total area of the black portions and the total area of the white portions are calculated, the ratio of the total area of the black portions to the total area of the white portions is 0.03 to 0.5, and the black portions have an average area of 100 to 300 μm2.