Thermal Transfer Sheet Fluorescent Layer Copolymer
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Solution Overview
Problem
Thermal transfer sheets with a fluorescent layer and thermofusible ink layer face challenges in achieving high-speed transferability without printing omissions or faint prints, and in maintaining sufficient fluorescence intensity and abrasion resistance.
Innovation Solution
A thermal transfer sheet comprising a substrate, a fluorescent layer with a vinyl acetate-vinylpyrrolidone copolymer, and a thermofusible ink layer, where the fluorescent layer contains specific particles and a binder, and a peeling layer is optionally included to enhance transfer properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a fluorescent layer is added to enhance fluorescence intensity, then fluorescence intensity is improved, but high-speed transferability deteriorates due to printing omissions and faint prints
Solution Approach 1:
The patent changes the chemical composition parameters of the fluorescent layer by incorporating a vinyl acetate-vinylpyrrolidone copolymer with specific properties. This polymer modification alters the layer's thermal and rheological characteristics, enabling it to maintain fluorescence intensity while achieving high-speed transferability by preventing printing omissions and faint prints during rapid thermal transfer processes
Solution Approach 2:
The patent creates a composite fluorescent layer by combining vinyl acetate-vinylpyrrolidone copolymer with fluorescent materials. This composite structure integrates the beneficial properties of both components: the copolymer provides excellent thermal transfer characteristics and high-speed transferability, while the fluorescent materials maintain strong fluorescence intensity, thereby resolving the contradiction between fluorescence performance and transfer speed
2Illumination intensity
If a fluorescent layer is added to enhance fluorescence intensity, then fluorescence intensity is improved, but abrasion resistance deteriorates
Solution Approach 1:
The patent modifies the physical and chemical parameters of the fluorescent layer through the use of vinyl acetate-vinylpyrrolidone copolymer. This copolymer provides enhanced mechanical strength and abrasion resistance while maintaining the fluorescent properties, thereby improving both fluorescence intensity and durability simultaneously
3Productivity
If printing speed is increased to improve productivity, then output is improved, but printing quality deteriorates due to printing omissions and faint prints
Solution Approach 1:
The patent changes the thermal and rheological parameters of the fluorescent layer by incorporating vinyl acetate-vinylpyrrolidone copolymer. This modification allows the layer to maintain its structural integrity and fluorescent material distribution even during high-speed thermal transfer, preventing printing omissions and faint prints while achieving high printing speeds
Solution Approach 2:
The patent prepares the fluorescent layer in advance with optimal composition and structure using vinyl acetate-vinylpyrrolidone copolymer. This preliminary preparation ensures that the layer has the necessary properties for high-speed transferability before the actual printing process, preventing printing quality deterioration during rapid operation
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 enables high-speed transferability with improved fluorescence intensity and abrasion resistance, preventing printing omissions and maintaining image integrity under high-speed printing conditions.
Implementation Method 1
a fluorescent layer, and a thermofusible ink layer in this order, wherein the fluorescent layer contains a fluorescent material
Data Source
Figure 1~3
AI summary
Provided is a thermal transfer sheet having an excellent high-speed transferability and capable of forming images with high fluorescence intensity and abrasion resistance. The thermal transfer sheet of the present invention includes a substrate, a fluorescent layer, and a thermofusible ink layer in this order, in which the fluorescent layer contains a fluorescent material, and a vinyl resin.