Thermal Transfer Sheet Release Layer Alumina Adhesion
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Solution Overview
Problem
Conventional thermal transfer sheets face issues with layer detachment and transfer defects such as delamination trace and tailing due to insufficient adhesion between the transfer layer and substrate, leading to poor transferability.
Innovation Solution
A thermal transfer sheet comprising a substrate, a release layer containing alumina or alumina hydrate and a binder resin, and a transfer layer with a peeling layer, where the solid content ratio of alumina or alumina hydrate to binder resin is between 7/3 and 9/1 by mass, and the transfer layer has a thickness of 2 μm or more and 6 μm or less, enhancing adhesion and preventing layer detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional release layer is used to prevent layer detachment, then delamination force in non-heating period is reduced, but delamination force in heating period increases excessively causing transfer defects
Solution Approach 1:
The invention changes the chemical composition parameters of the release layer by incorporating specific compounds (silicone oil, fluorine-containing plasticizer, or wax) in controlled amounts (0.1-10 mass%). This compositional parameter change enables the release layer to exhibit dual characteristics: strong adhesion during storage (preventing layer detachment) and appropriate release properties during thermal transfer (preventing transfer defects).
Solution Approach 2:
The invention creates a composite release layer by combining traditional adhesive materials with releasing agents (silicone oil, fluorine-containing plasticizer, or wax). This composite structure integrates the functions of both adhesion and release, allowing the release layer to maintain strong bonding during storage while enabling clean transfer during heating, thus resolving the contradiction between preventing layer detachment and ensuring transfer quality.
2Reliability
If adhesion force between transfer layer and substrate is increased to prevent layer detachment, then transferability improves, but delamination force increases causing transfer defects
Solution Approach 1:
The invention introduces dynamic behavior to the release layer's adhesion properties through the addition of temperature-responsive releasing agents. The release layer exhibits strong adhesion at storage temperatures but transitions to controlled release at thermal transfer temperatures. This dynamic adjustment of adhesion strength based on temperature conditions allows the system to achieve both strong bonding during storage and clean transfer during heating, eliminating delamination traces.
3Reliability
If transfer layer thickness is increased to improve adhesion, then layer detachment is prevented, but transfer defects such as tailing occur
Solution Approach 1:
The invention introduces the release layer containing releasing agents as an intermediary between the transfer layer and substrate. This intermediary layer mediates the interaction between the transfer layer and substrate, providing strong adhesion during storage while enabling clean separation during thermal transfer. The presence of this intermediary layer with controlled release properties allows for sharp, defect-free transfer edges without requiring excessive transfer layer thickness.
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 effectively prevents layer detachment and improves transferability, reducing the occurrence of transfer defects like delamination trace and tailing, ensuring high-quality image transfer.
Implementation Method 1
sufficient adhesion force between a transfer layer and a substrate or the like in a non-heating
Data Source
AI summary
An object is to provide a thermal transfer sheet that can prevent the occurrence of layer detachment and has high transferability for preventing the occurrence of transfer defects such as delamination trace and tailing.The thermal transfer sheet of the invention is characterized in that it includes a substrate, a release layer, and a transfer layer in that order, and the release layer contains at least one of alumina and alumina hydrate, and a binder resin.