Transparent Adhesive Sheet Thermal Printing Layer
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Solution Overview
Problem
Existing transparent adhesive sheets face challenges in allowing for printing during use while maintaining high transparency, as common methods either damage transparency or require preprinting, limiting their application.
Innovation Solution
A transparent adhesive sheet with a recording layer containing a color-developing material that thermally develops color, allowing for thermal printing during use, and a base material layer made of transparent material, ensuring the sheet remains transparent before and after printing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a release layer containing silicone resins or silicone oils is formed on the front surface side, then the adhesive layer can be released from the release layer, but printing cannot be performed on the release layer because the release agents repel printed ink
Solution Approach 1:
The patent divides the front surface side into two distinct functional layers: a release layer containing silicone resins or silicone oils for release properties, and a printing layer containing a water-soluble resin and a pigment for printing capability. This segmentation allows each layer to perform its specific function without interfering with the other, resolving the contradiction between release properties and printing capability.
Solution Approach 2:
The patent introduces an intermediate printing layer between the release layer and the adhesive layer. This intermediate layer acts as a mediator that receives printed ink while the release layer maintains its release properties. The printing layer contains a water-soluble resin that forms a gel structure to hold pigment particles, enabling printing without compromising the release layer's functionality.
2Ease of manufacture
If preprinting is performed on the base material layer before forming the release layer or adhesive layer, then printing can be done, but the request to perform printing when bonding the transparent adhesive sheet cannot be met
Solution Approach 1:
The patent incorporates a printing layer with pigment particles and water-soluble resin into the structure before the adhesive layer is formed. This preliminary preparation of the printing layer allows printing to be performed at any time during use, including after the adhesive layer has been applied, providing timing flexibility while maintaining manufacturing feasibility.
Solution Approach 2:
The patent creates a dynamic printing system where the printing layer can be activated at any time during the product's service life. The water-soluble resin forms a gel structure that can be triggered by water or moisture to release pigment particles, enabling on-demand printing regardless of when the adhesive layer was applied, thus providing temporal adaptability.
3Ease of manufacture
If a deep-color ink layer is formed to enable laser beam irradiation for printing, then printing can be performed, but the transparent adhesive sheet cannot maintain high transparency because the deep-color layer absorbs laser beams
Solution Approach 1:
The patent changes the optical parameters of the printing layer by using a water-soluble resin with specific absorption characteristics. The resin forms a gel structure that can be triggered by water or moisture to release pigment particles, enabling printing without requiring a deep-color layer that would absorb laser beams and compromise transparency.
Solution Approach 2:
The patent replaces the laser beam irradiation method with a water or moisture-triggered gel formation mechanism. Instead of using laser beams to remove material or activate pigment, the system uses water-soluble resin that forms a gel structure when exposed to water, thereby releasing pigment particles for printing while maintaining transparency.
4Ease of manufacture
If thermal printing is performed on a thermal color developing paper sheet, then printing can be done, but transparency is damaged by the thermal layer
Solution Approach 1:
The patent applies local quality by placing the thermal-sensitive recording layer only where printing is needed, while keeping the rest of the adhesive sheet transparent. The recording layer contains a color developing material that responds to thermal energy, allowing printing in specific areas without compromising the overall transparency of the adhesive sheet.
Solution Approach 2:
The patent uses a color developing material that remains transparent in its undeveloped state and only changes color when thermal energy is applied during printing. This color change mechanism allows the sheet to maintain high transparency during normal use while enabling printing functionality when thermal printing is performed, resolving the contradiction between transparency and printing capability.
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
Enables simple and effective printing on the adhesive sheet without compromising transparency, allowing it to be used as a transparent adhesive tape that does not obscure adherends.
Implementation Method 1
a recording layer (3) formed on a front surface side of the base material layer (2) and containing a color developing material that thermally develops color
Implementation Method 2
a base material layer (2) formed with a transparent material... the transparent adhesive sheet can be used as a transparent adhesive tape
Data Source
Figure 1~4
Figure 5~7
Figure 8
AI summary
There is provided a transparent adhesive sheet on which printing can be performed during in use and which has high transparency, while including an adhesive layer on the front surface side and a release layer on the back surface side. The transparent adhesive sheet includes: a base material layer formed with a transparent material; an adhesive layer formed on the back surface side of the base material layer and formed with an adhesive agent for bonding to an adherend; a recording layer formed on the front surface side of the base material layer and containing a color developing material that thermally develops color; and a release layer formed on the further front surface side of the recording layer and having release properties to the adhesive agent. The transparent adhesive sheet is transparent in the state before the recording layer develops color.