Thermal Transfer Sheet Peel Layer Composition
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Solution Overview
Problem
Thermal transfer sheets used for printing fine texts and figures often suffer from smudges and blurs due to the heat-fusion type thermal transfer sheets, which are exacerbated by moisture and high temperatures, leading to transfer failures and image quality issues.
Innovation Solution
A thermal transfer sheet comprising a substrate with a peel layer containing a binder resin, an intermediate layer with inorganic colloid materials like alumina sol or colloidal silica, and a transfer layer, where the peel layer has a specific composition of acrylic-based and vinyl chloride-vinyl acetate resins, and optionally includes silicone oil and wax components to improve peeling and storage stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a heat-fusion colored layer is used for thermal transfer, then the transfer layer can be transferred to the receiving sheet, but the release layer softens due to heat and the peel force becomes high causing transfer failure and image quality issues
Solution Approach 1:
The patent divides the release layer into multiple functional layers: a first release layer (polyamide-based resin) that resists heat softening and a second release layer (acrylic-styrene-based resin) that provides controlled peeling. This segmentation allows each layer to perform its specific function without the harmful effects of heat-induced softening compromising the entire structure.
Solution Approach 2:
The patent uses a composite release layer structure combining polyamide-based resin (for heat resistance) with acrylic-styrene-based resin (for controlled peeling). This composite material approach allows the system to simultaneously achieve heat stability and controlled peelability, resolving the contradiction between heat resistance and peeling control.
2Ease of operation
If a water-based release layer is used, then the release layer provides good peeling properties, but it becomes unstable to moisture and causes whitening and abnormal noise
Solution Approach 1:
The patent changes the chemical composition parameters of the release layer by replacing water-based polymers with polyamide-based resins that have different hygroscopic properties. This parameter change eliminates moisture instability while preserving peeling functionality through the controlled composition and structure of the polyamide resin system.
3Manufacturing precision
If the thermal transfer sheet is used for printing fine texts and figures, then detailed images can be formed, but smudges and blurs appear due to heat fusion and moisture effects
Solution Approach 1:
The patent segments the release layer into two distinct layers with different functions: the first release layer (polyamide-based) provides heat and moisture stability to prevent smudges, while the second release layer (acrylic-styrene-based) provides controlled peeling. This segmentation isolates the harmful effects to specific layers while protecting the transfer layer and received image quality.
Solution Approach 2:
The first release layer (polyamide-based resin) acts as an intermediary barrier between the thermal head heat and the transfer layer. This intermediary layer absorbs and distributes heat uniformly, preventing localized overheating that causes smudges and blurs, while also blocking moisture penetration.
4Power
If high heat is applied to the thermal head for transfer, then the transfer process is effective, but the release layer softens excessively causing transfer failure
Solution Approach 1:
The patent segments the heat resistance function across two layers: the polyamide-based first release layer provides high-temperature structural integrity to withstand thermal head heat, while the acrylic-styrene-based second release layer is designed for controlled peeling at lower temperatures. This segmentation allows high thermal power application without compromising overall structural integrity.
Solution Approach 2:
The composite structure of polyamide-based and acrylic-styrene-based resins creates a system where the polyamide component provides thermal stability and structural strength, while the acrylic-styrene component provides controlled peeling characteristics. This composite material approach allows the system to withstand high thermal power while maintaining structural integrity during transfer.
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 thermal transfer sheet reduces smudges and blurs, enabling the transfer of thin lines under low energy conditions and enhancing printing quality, while maintaining stability even after storage under high temperature environments.
Implementation Method 1
The intermediate layer contains at least an inorganic colloid material... reduces smudges and blurs... enabling the transfer of thin lines under low energy conditions
Implementation Method 2
a peel layer and an intermediate layer on the substrate, and a transfer layer... the peel layer has a specific composition of acrylic-based and vinyl chloride-vinyl acetate resins... to improve peeling
Implementation Method 3
a so-called fusion transfer type, in which a heat-fusion colored layer fusion-softens and the heat-fusion colored layer is transferred to an object
Implementation Method 4
a so-called sublimation transfer type, in which dyes in a colorant layer sublimate and transfer to a receiving sheet by sensing heat
Data Source
Figure 1~2
Figure 3
AI summary
There is provided a transfer sheet with improvement in smudges and blurs of a transfer sheet when printed matters are produced. A transfer sheet according to the present invention comprises a transfer sheet comprising a substrate, and in the order a peel layer, an intermediate layer and a transfer layer on the substrate, wherein the peel layer contains a binder resin containing an acrylic-based resin of more than 0 mass % and 49 mass % or less and a vinyl chloride-vinyl acetate resin of 51 mass % or more and less than 100 mass %, and the intermediate layer contains at least an inorganic colloid material.