Adhesive Ink Forming High-Definition Foil Images
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Solution Overview
Problem
Conventional foil image forming methods face challenges in achieving high-definition images regardless of the hydrophilicity of the recording medium, as aqueous adhesives can bleed or coalesce, leading to impaired image quality.
Innovation Solution
A foil image forming method using an inkjet printing technique with an adhesive ink containing water, a water-soluble organic solvent, and a copolymer resin with specific properties, such as a glass transition temperature of 30 to 110°C, applied to either the recording medium or foil sheet, allowing for heat-pressure bonding and subsequent peeling to form a high-definition image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If aqueous adhesive is used for foil image formation, then adhesion function is provided, but the adhesive lands as droplets that may bleed on hydrophilic recording media or coalesce on low hydrophilicity media, impairing image fineness
Solution Approach 1:
The patent modifies the physical and chemical parameters of the aqueous adhesive by adding specific substances (surfactants, viscosity control agents, coagulants) to change its surface tension, viscosity, and coalescence characteristics. This allows the adhesive to maintain droplet form on both hydrophilic and low hydrophilicity recording media, preventing both bleeding and unwanted coalescence while preserving adhesion function.
Solution Approach 2:
The patent introduces intermediary substances (surfactants, viscosity control agents, coagulants) that mediate between the aqueous adhesive and the recording medium. These intermediaries control the interaction between water-based adhesive and the recording medium surface, enabling precise control over droplet behavior regardless of the medium's hydrophilicity.
2Ease of manufacture
If conventional aqueous adhesive is used, then cost is reduced and adhesion is achieved, but the adhesive spreads or coalesces depending on recording medium hydrophilicity, resulting in poor image quality
Solution Approach 1:
The patent maintains the cost-effectiveness of aqueous adhesive while modifying its parameters through the addition of functional substances. The surfactants, viscosity control agents, and coagulants are added in controlled amounts to achieve the desired droplet control without significantly increasing manufacturing cost, while substantially improving image quality.
Solution Approach 2:
The patent creates a composite aqueous adhesive system by combining water-based adhesive with functional additives (surfactants, viscosity control agents, coagulants). This composite formulation integrates the cost benefits of aqueous adhesive with the precision control capabilities of specially formulated additives, achieving both low cost and high image quality.
3Adaptability or versatility
If adhesive ink is applied to recording medium, then foil image formation is enabled, but the adhesive may spread due to wetting on hydrophilic surfaces or fail to adhere properly on low hydrophilicity surfaces
Solution Approach 1:
The patent adjusts the surface tension and wetting parameters of the adhesive ink through the addition of surfactants and viscosity control agents. This enables the adhesive to maintain appropriate wetting behavior on both hydrophilic and low hydrophilicity recording media, achieving uniform distribution and proper adhesion across different medium types without spreading or failing to adhere.
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 method ensures proper adhesion and prevents spreading of the adhesive ink, resulting in high-definition foil images with enhanced durability and resistance to hydrophilicity variations of the recording medium.
Implementation Method 1
heat-pressure bonding the recording medium and foil of the foil sheet
Implementation Method 2
an aqueous adhesive mainly includes water. Water has a lower volatilization rate than an organic solvent. Therefore, in the foil image forming method, the aqueous adhesive landed as droplets on the recording medium has a sufficiently high fluidity
Implementation Method 3
a glass transition temperature of the copolymer resin is 30 to 110° C.
Data Source
AI summary
The present invention addresses at least the problem of providing a method for forming a high-resolution foil image regardless of the hydrophilicity of a recording medium. In order to solve said problem, the present invention provides a method wherein an adhesive ink that is formed by dispersing or dissolving a polymer resin in water and in a water-soluble organic solvent is used as an adhesive for a foil, the adhesive is applied by means of inkjet printing, and a foil image is formed. The polymer resin of the adhesive ink is a polymer of a monomer that includes (meth)acrylic acid and a (meth)acrylic acid alkyl ester having a C2-12 alkyl group, the acid value of the polymer resin being 50-120 mg KOH/g, and the glass transition temperature of the polymer resin being 30-110° C.