Heat-Sensitive Recording Layer With Controlled Silicone Diffusion
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Solution Overview
Problem
Existing heat-sensitive recording materials face challenges in maintaining sensitivity to external heat for forming visually recognizable images while being designed as self-adhesive tickets without additional release paper, and their production involves complex and costly processes that hinder layer adhesion and reduce sensitivity.
Innovation Solution
A heat-sensitive recording material with a diffusion layer formed by the diffusion of a release agent into the heat-sensitive recording layer, using a third coating composition containing a silicone component, an adhesion promoter, and a cross-linking agent under UV radiation, ensuring layer adhesion and maintaining sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a water glass spread is applied to prevent silicone penetration into the paper web, then silicone penetration is prevented, but this approach is unsuitable for heat-sensitive recording materials and does not ensure proper adhesion
Solution Approach 1:
The patent removes the water glass spread layer entirely and instead allows controlled silicone diffusion into the recording layer. The harmful effect of silicone penetration is converted into a useful adhesion mechanism by extracting the preventive barrier and utilizing the diffusion process directly for bonding purposes.
Solution Approach 2:
The silicone component acts as an intermediary substance that diffuses from the adhesive layer into the recording layer, creating a chemical bridge that bonds these two layers together. This mediator approach replaces the physical barrier (water glass) with a chemical bonding mechanism.
2Object-affected harmful factors
If a protective layer with filler and binder components is added to prevent silicone penetration, then silicone penetration is prevented, but the dynamic and static sensitivity of the heat-sensitive recording material is reduced
Solution Approach 1:
The patent extracts and eliminates the filler and binder components from the protective layer, retaining only the essential silicone diffusion mechanism. This removal of extraneous components prevents the degradation of heat sensitivity while maintaining the adhesion function.
Solution Approach 2:
The invention applies local quality by allowing silicone diffusion only in the specific region where adhesion is needed (at the interface between adhesive and recording layers), rather than applying a universal protective layer that would affect the entire recording material's sensitivity.
3Object-affected harmful factors
If the adhesive layer is covered by separate release paper, then silicone penetration is prevented, but handling becomes less practical and requires additional components
Solution Approach 1:
The patent merges the adhesive layer and release function into a single integrated structure. The adhesive layer itself provides the release function through controlled silicone diffusion, eliminating the need for a separate release paper component and simplifying the overall structure.
Solution Approach 2:
The adhesive layer is given multiple functions: it provides adhesion through silicone diffusion into the recording layer and simultaneously serves as the release mechanism. This multi-functionality eliminates the need for separate release paper and simplifies handling.
4Adaptability or versatility
If the front surface is made adhesive to enable self-adhesive ticket usage, then self-adhesive functionality is achieved, but silicone penetration into the recording layer may occur affecting adhesion and sensitivity
Solution Approach 1:
The patent changes the parameters of silicone diffusion by controlling the molecular weight and concentration of the silicone component. By optimizing these parameters, the silicone diffuses sufficiently to provide strong adhesion but not so much that it degrades the recording layer's sensitivity or causes unwanted penetration effects.
Solution Approach 2:
The invention creates a composite structure where the adhesive layer and recording layer are chemically bonded through controlled silicone diffusion. This composite approach ensures that the adhesive functionality and recording sensitivity are compatible and mutually supportive rather than conflicting.
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 material achieves effective layer adhesion and high sensitivity for forming clear prints, allowing self-adhesive applications without additional release paper, with optimized manufacturing costs and improved handling properties.
Implementation Method 1
a diffusion layer (4) formed by a silicone component that diffuses into the recording layer
Implementation Method 2
an intermediate layer containing hollow body pigments between the substrate and the recording layer
Implementation Method 3
at least one dye precursor and at least one (color) developer reactive with this at least one dye precursor... reacts with a dye precursor with sufficient supply of external heat to form a visually recognizable printed image
Data Source
Figure 1
AI summary
Disclosed is a heat-sensitive recording material comprising: a strip-shaped substrate (1) having a front face and a rear face opposite the front face; a heat sensitive recording layer (3) disposed on the front face of the strip-shaped substrate (1), wherein the heat-sensitive recording layer (3) contains at least one dye precursor and at least one (colour) developer that is reactive with the at least one dye precursor; a front-face surface (6) of the heat sensitive recording material, which is designed to be dehesive with respect to adhesive layers (7) which can be applied to the rear face of the strip-shaped substrate (1). The disclosed heat-sensitive recording material is characterised in that, in order to form the dehesive front-face surface (6) thereof, said heat-sensitive recording material has at least one application (5), arranged above the heat-sensitive recording layer (3) and having at least one separating means, and has at least one diffusion layer (4) formed between the application (5) having at least one separating means and the heat-sensitive recording layer (3). Also disclosed are a method for producing such a heat-sensitive recording material and possibilities for the use thereof.