UV-Curable Ink Adhesive Bonding for High-Shield Foils
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Solution Overview
Problem
Existing methods for bonding an adherend to an adhesive body using ultraviolet-curable ink face challenges such as immediate adhesion requirements, adhesive spreading, and difficulty in bonding high-shield foils like gold, which reduces convenience and image definition.
Innovation Solution
A method involving the formation of an ink layer using ultraviolet-curable ink ejected from an inkjet head, followed by UV curing, lamination with the adherend and adhesive body, and subsequent heating to soften the ink layer for adhesive function, allowing for delayed processing and improved bonding with high definition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If ultraviolet-curable ink is used as adhesive and immediately transferred after first curing, then adhesion function is achieved, but convenience of bonding operation is lowered and image definition deteriorates due to smudging
Solution Approach 1:
The patent divides the bonding process into two independent stages: (1) inkjet printing and UV curing to form adhesive pattern, and (2) foil transfer and second UV curing. This segmentation allows the adhesive to be formed in advance without immediate transfer requirements, improving operational convenience while preventing smudging through complete initial curing.
Solution Approach 2:
The adhesive pattern is formed in advance through inkjet printing and UV curing before the foil transfer process. This preliminary action creates a stable, cured adhesive layer that can be stored and handled without smudging, while still maintaining adhesion functionality for the subsequent transfer step.
2Ease of manufacture
If high-shield foil such as gold foil is used, then decorative function is improved, but UV curing is blocked and adhesion deteriorates
Solution Approach 1:
Instead of curing the adhesive through the foil (which blocks UV rays), the patent inverts the sequence: the adhesive is fully cured on the substrate first, then the foil is transferred onto the already-cured adhesive. This reversal eliminates the UV shielding problem while maintaining both decorative and adhesive functions.
Solution Approach 2:
The patent replaces UV curing through the foil with a two-step process: (1) UV curing of adhesive on substrate, and (2) thermal or mechanical bonding after foil transfer. This substitution bypasses the UV blocking issue by using alternative bonding mechanisms for the foil layer.
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
This method enhances the convenience of the bonding operation, prevents adhesive spreading, and enables effective bonding of high-shield foils with improved image definition and scratch resistance.
Implementation Method 1
irradiating ultraviolet ray to the ultraviolet-curable ink to cure the same
Implementation Method 2
heating the ink layer, enabling the ink layer to function as an adhesive
Data Source
AI summary
Provided is a method for favorable bonding between an adherend and an adhesive body, which is capable of suppressing an ink layer, which is formed by an ultraviolet-curable ink, from being smudged while increasing convenience of a bonding operation between the adherend and the adhesive body, and the like. The method for bonding a medium to a foil body includes an ink layer formation process of spotting an ultraviolet-curable ink, which is ejected from an inkjet head, to a medium and irradiating ultraviolet ray to the ultraviolet-curable ink to cure the same, thereby forming an ink layer; a lamination process of laminating the medium and a foil body with the ink layer being sandwiched therebetween; and a bonding process of heating the ink layer, enabling the ink layer to function as an adhesive, and bonding the medium to the foil body.