Thermal Transfer Sheet Intermediate Layer Inorganic Particles
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Solution Overview
Problem
The existing thermal transfer sheets fail to adequately enhance the designability of printed products in terms of image density and transferring properties when forming thermally transferable images on receiving layers.
Innovation Solution
A thermal transfer sheet with a layered structure comprising a receiving layer, an intermediate layer containing inorganic particles such as alumina or silica, and a masking layer, where the intermediate layer can include a urethane-based resin, and the masking layer can contain titanium oxide, allowing for improved image density and transferring efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a simple receiving layer structure is used, then the manufacturing process is simple, but the printing density and image quality are insufficient
Solution Approach 1:
The receiving layer is divided into three distinct functional layers: a base receiving layer for substrate support, an intermediate layer containing inorganic particles (alumina or silica) for enhanced adhesion and heat distribution, and a masking layer for pattern definition. This segmentation allows each layer to optimize its specific function, resulting in superior printing density and image quality while maintaining manufacturing feasibility through sequential coating processes.
Solution Approach 2:
The intermediate layer is formulated as a composite material combining organic binder resin with inorganic particles (alumina or silica). This composite structure provides synergistic effects: the inorganic particles enhance thermal conductivity and adhesion to the substrate, while the organic binder provides flexibility and coating processability. The composite receiving layer thus achieves both high printing density and manufacturing simplicity.
2Manufacturing precision
If a transparent receiving layer is used, then the transfer process is simple, but the designability and image density are insufficient
Solution Approach 1:
The masking layer is applied selectively to specific regions of the receiving layer where pattern definition is required. This local application allows the unmasked regions to remain transparent for optimal light transmission during transfer, while the masked regions provide the necessary opacity for design elements. This localized approach maintains the overall simplicity of the transfer process while enhancing image density and designability in critical areas.
3Adaptability or versatility
If the transfer layer is transferred onto a patterned transfer receiving article, then an overlay image is formed, but the original pattern cannot be masked
Solution Approach 1:
The masking layer is pre-applied to the receiving layer before the transfer process. This preliminary action defines the pattern areas that should remain opaque, allowing the transfer of thermally transferable images onto predetermined regions. When the transfer layer is applied over this pre-masked receiving layer, the masking capability is already in place, enabling versatile pattern control without adding complexity to the transfer operation 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 solution significantly enhances the designability and printing density of the final product by improving the foil cutting and printing density properties during the transfer process, resulting in higher quality thermally transferable images.
Implementation Method 1
the intermediate layer contains inorganic particles, wherein the inorganic particles are alumina particles derived from colloidal alumina or silica particles derived from colloidal silica
Implementation Method 2
an intermediate layer, and a masking layer are layered in this order from the side of the substrate
Data Source
Figure 1~3
Figure 4~5(c)
Figure 6(a)~6(b)
AI summary
The present invention provides a thermal transfer sheet which can provide a thermal transfer image-receiving sheet capable of forming a printed product of high designability, provides a thermal transfer image-receiving sheet capable of forming a printed product of high designability and a method for forming a printed product, and provides a printed product of high designability. In a thermal transfer sheet 100 in which a transfer layer 10 is provided on a substrate 1, the transfer layer 10 has a layered structure in which a receiving layer 2, an intermediate layer 3, and a masking layer 4 are layered in this order from the side of the substrate 1, and the intermediate layer 3 contains inorganic particles.