Acid-Modified Polyolefin Release Layer for Thermal Transfer Sheets
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Solution Overview
Problem
Thermal transfer sheets face challenges in achieving good foil cutting and holding properties for transfer layers, leading to issues like tailing and fall-off during transfer and bending.
Innovation Solution
A thermal transfer sheet with a substrate, a release layer containing acid-modified polyolefin, and a transfer layer, where the release layer is positioned between the substrate and the transfer layer, enhancing the foil cutting and holding properties by suppressing tailing and fall-off.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional release layer is used, then the transfer layer can be released from the substrate, but the foil cutting property and foil holding property are insufficient
Solution Approach 1:
The release layer uses acid-modified polyolefin with specific parameters: melting point of 75-160°C and weight average molecular weight of 50,000-120,000. These parameter specifications optimize both the foil cutting property (preventing tailing) and foil holding property (preventing fall-off) simultaneously.
Solution Approach 2:
The release layer is formed as a composite material using acid-modified polyolefin, which combines the properties of polyolefin (good release properties) with acid modification (improved adhesion and foil holding). This composite approach resolves the contradiction between release functionality and foil holding property.
2Productivity
If the transfer layer is heated for transfer, then the transfer layer transfers onto the receiving article, but tailing and fall-off occur during transfer and bending
Solution Approach 1:
The acid-modified polyolefin in the release layer has a melting point range (75-160°C) that allows controlled release during heating. The modification creates optimal adhesion characteristics that prevent tailing and fall-off while maintaining efficient transfer at the specified heating temperature range.
Solution Approach 2:
The release layer acts as an intermediary between the substrate and transfer layer. The acid-modified polyolefin provides controlled adhesion and release characteristics, mediating the transfer process to prevent defects like tailing and fall-off while ensuring complete transfer.
3Reliability
If a release layer is provided between substrate and transfer layer, then the transfer layer can be transferred, but unintended crosslinking reactions may occur
Solution Approach 1:
The acid-modified polyolefin uses a controlled acid modification level that provides sufficient adhesion for foil holding without excessive reactivity that would cause crosslinking. The specific molecular weight and melting point parameters also ensure proper thermal behavior during transfer without promoting unwanted chemical reactions.
Solution Approach 2:
The release layer provides localized adhesion control at the interface between substrate and transfer layer. The acid-modified polyolefin creates specific local chemical properties that enhance foil holding where needed while maintaining overall chemical compatibility and preventing crosslinking throughout the structure.
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 effectively improves the transferability, foil cutting, and foil holding properties of the transfer layer, ensuring reliable transfer and adhesion without unintended crosslinking reactions.
Implementation Method 1
the release layer contains an acid-modified polyolefin
Implementation Method 2
heating the other face of the substrate by a heating device
Data Source
AI summary
Provided is a thermal transfer sheet having a good foil holding property of a transfer layer and a good foil cutting property of the transfer layer.A thermal transfer sheet which comprises a substrate 1, a release layer 2, and a transfer layer 10 which are layered in this order, wherein the interval between the release layer 2 and the transfer layer 10 corresponds to the transfer interface of the transfer layer 10, and the release layer 2 contains an acid-modified polyolefin.