Dual-Layer Scratch-Off Ink for Water and Rub Resistance
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Solution Overview
Problem
Existing scratch-off inks lack sufficient water and rub resistance while maintaining ease of removal with a scratching force, particularly when applied to surfaces with low energy, such as beverage containers that encounter various environmental conditions.
Innovation Solution
A dual-layer scratch-off ink system comprising a water-based ink layer and an ultraviolet-cured ink layer, where the UV ink layer provides water resistance and the water-based ink layer ensures easy removal with a scratching force, adhered by a low-surface-energy release coating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single-layer scratch-off ink is used, then the device complexity is reduced, but the water and rub resistance is insufficient
Solution Approach 1:
The scratch-off ink is divided into two separate layers: a water-based scratch-off layer that provides ease of removal with scratching force, and a UV-cured resin layer that provides water and rub resistance. Each layer performs its specific function independently, resolving the contradiction between resistance and simplicity.
Solution Approach 2:
The patent combines two different material systems (water-based ink and UV-cured resin) into a composite structure. The UV-cured resin layer acts as a protective coating over the water-based scratch-off layer, providing both water and rub resistance while maintaining the scratch-off functionality.
2Reliability
If a UV-cured resin layer is added for water resistance, then the water resistance is improved, but the ease of removal with scratching force deteriorates
Solution Approach 1:
By segmenting the ink into two layers with distinct properties, the water-based layer maintains its ease of removal characteristic while the UV-resin layer provides water resistance. The scratching force selectively removes the water-based layer without significantly affecting the UV-resin layer.
Solution Approach 2:
Different regions of the coating system have different properties: the UV-cured resin layer provides durability and water resistance where needed, while the water-based layer provides ease of removal in the scratch-off areas. Each layer has optimized local properties for its specific function.
3Strength
If the ink adheres strongly to low surface energy surfaces, then the adhesion is improved, but the ease of removal with scratching force worsens
Solution Approach 1:
The segmented structure allows the water-based layer to adhere to the substrate while the UV-resin layer provides the scratch-off functionality. The scratching force removes the water-based layer which has appropriate adhesion characteristics, while the UV-resin layer remains adhered to provide durability.
Solution Approach 2:
The patent changes the adhesion parameters of different layers: the water-based layer has optimized adhesion for easy removal, while the UV-cured resin layer has strong adhesion for durability. This parameter differentiation resolves the contradiction between strong adhesion and ease of removal.
4Reliability
If moderate rubbing resistance is provided, then the durability is improved, but the scratching force required increases
Solution Approach 1:
The dual-layer structure segments the functions: the UV-cured resin layer provides durability and moderate rubbing resistance, while the water-based layer provides the scratch-off functionality. The scratching force is sufficient to remove the water-based layer without requiring excessive force that would damage the UV-resin layer.
Solution Approach 2:
Different regions of the coating have different mechanical properties optimized for their functions: the UV-resin layer has higher hardness and rubbing resistance where durability is needed, while the water-based layer has lower hardness for easy scratch-off removal with moderate force.
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 dual-layer system maintains adhesion during moderate rubbing yet allows easy removal with minimal force, providing durable and water-resistant scratch-off functionality on diverse surfaces.
Implementation Method 1
an ultraviolet-cured ink layer printed over a layer of water-based ink
Data Source
AI summary
A scratch-off coating is provided which includes a first layer of ink comprised of a water-based ink; and a second layer of ink comprised of an ultraviolet-cured ink layered over said first layer of ink, wherein upon application of a scratching force said first layer of ink and said second layer of ink are removable from a surface on which said first layer of ink and said second layer of ink are applied.