Thermal Transfer Sheet Peel-Off Layer Adhesion Control
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Solution Overview
Problem
Existing thermal transfer sheets with peel-off layers struggle to accurately remove predetermined regions of the transfer layer from intermediate transfer media, often leaving residual layers behind due to inadequate adhesion and composition issues.
Innovation Solution
A thermal transfer sheet with a peel-off layer comprising a combination of vinyl chloride-type and acrylic-type resins, where the vinyl chloride-type resin constitutes between 50% to 95% of the total mass, and a polyester-type resin with a specific molecular weight and glass transition temperature, ensuring accurate removal of the transfer layer by adjusting the adhesion properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a peel-off layer is provided on a thermal transfer sheet to remove predetermined regions of the transfer layer, then the function of removing specific regions is enabled, but the removal accuracy is insufficient and residual layers remain
Solution Approach 1:
The patent changes the chemical composition parameters of the peel-off layer by incorporating specific resins (polyester resin with Tg of 50-120°C, vinyl chloride-vinyl acetate copolymer, acrylic resin) in controlled proportions. This compositional parameter adjustment optimizes the adhesion characteristics of the peel-off layer, enabling it to selectively remove the transfer layer with high accuracy while preventing residual layer formation.
2Manufacturing precision
If the adhesion between the peel-off layer and transfer layer is increased to improve removal accuracy, then removal precision improves, but the peel-off layer may remain on the intermediate transfer medium
Solution Approach 1:
The patent applies local quality by creating different adhesion characteristics in different regions of the peel-off layer through controlled composition gradients. The peel-off layer is formulated with specific resins that provide strong adhesion to the transfer layer in regions requiring removal, while maintaining appropriate adhesion to the intermediate transfer medium in other regions, thus preventing unwanted retention.
Solution Approach 2:
The patent uses a composite material structure for the peel-off layer, combining multiple resin types (polyester resin, vinyl chloride-vinyl acetate copolymer, acrylic resin) in specific proportions. This composite formulation enables the peel-off layer to exhibit dual adhesion characteristics: strong bonding to the transfer layer for accurate removal while maintaining controlled adhesion to the intermediate transfer medium to prevent unwanted retention.
3Manufacturing precision
If a peel-off layer with strong adhesion is used to ensure complete removal, then removal completeness improves, but the peel-off layer itself transfers onto the intermediate transfer medium
Solution Approach 1:
The patent adjusts the compositional parameters of the peel-off layer by incorporating specific resins (polyester resin with Tg of 50-120°C, vinyl chloride-vinyl acetate copolymer, acrylic resin) in controlled proportions. This parameter optimization enables the peel-off layer to achieve strong adhesion to the transfer layer for complete removal while simultaneously reducing its adhesion to the intermediate transfer medium, preventing unwanted transfer of the peel-off layer itself.
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 enables precise and effective removal of predetermined regions of the transfer layer, preventing residual layers from remaining on the intermediate transfer medium, while maintaining sufficient adhesion to ensure the peel-off layer remains on the thermal transfer sheet.
Implementation Method 1
adhesion between the transfer layer and the peel-off layer as measured when a predetermined region of the transfer layer is removed by means of the peel-off layer
Implementation Method 2
energy applied to the thermal transfer sheet is set to 0.143 mJ/dot
Data Source
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AI summary
The present invention provides a thermal transfer sheet that can accurately remove a transfer layer, and a combination of a transfer foil and the thermal transfer sheet. A thermal transfer sheet comprising a peel-off layer on a substrate, wherein the peel-off layer contains a polyester-type resin having a number average molecular weight (Mn) of not less than 3500 and less than 9000, and having a glass transition temperature (Tg) of not less than 50°C and not more than 12 0°C.