Thermal Transfer Ink Layer Blooming Suppression
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Solution Overview
Problem
The existing thermal transfer recording media using carnauba wax emulsions suffer from blooming issues, leading to smeared surfaces and instability in forming high-quality images over time, especially when stored in roll form.
Innovation Solution
Incorporating a combination of an organic fatty acid with an acid value of 90 to 200 and at least one long-chain alcohol, represented by specific formulas, as emulsifiers in the ink layer, suppresses blooming and ensures stable image formation. The optimal composition includes a range of 1 to 6 parts of organic fatty acid and 6 to 12 parts of long-chain alcohol per 100 parts of carnauba wax, along with a nonionic surfactant for improved cohesion and reduced particle diameter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If only an organic fatty acid is used as the emulsifier for carnauba wax, then the carnauba wax can be emulsified with ease, but blooming of the carnauba wax occurs as time passes, causing the surface of the back layer to be smeared
Solution Approach 1:
The patent uses a composite emulsifier system combining organic fatty acid and long-chain alcohol instead of a single emulsifier. This composite approach allows the organic fatty acid to provide easy emulsification while the long-chain alcohol suppresses blooming, thereby resolving the contradiction between manufacturing ease and long-term reliability.
Solution Approach 2:
The patent specifies precise compositional parameters for the emulsifier system: organic fatty acid at 1-6 parts by mass and long-chain alcohol at 6-12 parts by mass per 100 parts by mass of carnauba wax. By optimizing these parameter ranges, the patent achieves both easy emulsification and suppression of blooming over time.
2Manufacturing precision
If carnauba wax is used in the form of aqueous emulsion, then edges of transferred matter are sharp and environmental load is reduced, but blooming occurs during storage, making stable formation of high-quality transferred images impossible
Solution Approach 1:
The long-chain alcohol acts as an intermediary substance in the emulsion system. It mediates between the carnauba wax particles and the aqueous environment, preventing blooming while maintaining the sharp edges characteristic of aqueous emulsion transfer. This intermediary role resolves the contradiction between precision and stability.
3Ease of operation
If the thermal transfer recording medium is stored in roll form, then it is convenient for handling and distribution, but the surface of the back layer becomes smeared due to blooming
Solution Approach 1:
The long-chain alcohol in the emulsifier system provides preliminary anti-action against blooming before it occurs during storage. By preemptively suppressing the blooming tendency of carnauba wax in the emulsion, the patent prevents surface smearing that would otherwise occur during roll storage, thereby maintaining both handling convenience and surface quality.
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
This composition effectively prevents blooming and maintains high-quality image transfer over a long period, ensuring sharp edges and reduced environmental impact, with enhanced sensitivity and rub resistance.
Implementation Method 1
the carnauba wax can be emulsified with ease
Implementation Method 2
use of a combination of an organic fatty acid having an acid value of 90 to 200 and at least one of a long-chain alcohol represented by Formula (1) and a long-chain alcohol represented by Formula (2), as an emulsifier for the carnauba wax
Implementation Method 3
a thermal transfer ink sheet (thermal transfer recording medium) is heated using thermal energy of a laser, a thermal head, etc. controlled with an electrical signal
Implementation Method 4
the carnauba wax is first completely melted at the time of the formation of the aqueous emulsion
Implementation Method 5
blooming of the carnauba wax occurs as time passes, even after cooling, because of its supercooled nature
Data Source
AI summary
A thermal transfer recording medium including a support, a release layer and an ink layer, the release layer and the ink layer being disposed in this order over the support, wherein the ink layer contains carnauba wax, an organic fatty acid having an acid value of 90 to 200, and at least one of a long-chain alcohol represented by Formula (1) and a long-chain alcohol represented by Formula (2),where R denotes a group containing 28 to 38 carbon atoms.