Nano-silver Ink Halftone Control for Metallic Appearance
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Solution Overview
Problem
Current commercial metal-pigmented inks are unsuitable for inkjet printing due to the large size of metallic flakes, which prevents them from passing through inkjet heads, and thermal transfer methods are slow and expensive, making it difficult to achieve varied metallic appearances for proofing applications.
Innovation Solution
The use of nano-particle metallic inks, such as nano-silver, allows for adjustable metallic appearances through halftone levels, substrate surface properties, and the introduction of small amounts of other colored inks via inkjet printing, enabling quick iteration to match desired designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thermal transfer method is used to print metal-pigmented inks, then metallic appearance can be achieved, but the process becomes slow and expensive
Solution Approach 1:
The patent changes the particle size parameter of metallic pigments from conventional large flakes (tens to hundreds of microns) to nano-particles (nanometer scale). This parameter change enables the metallic ink to be jetted through standard inkjet heads while maintaining metallic appearance, thus resolving the contradiction between achieving metallic quality and maintaining fast proofing speed.
2Reliability
If thermal transfer method is used to print metal-pigmented inks, then metallic appearance can be achieved, but the cost increases significantly
Solution Approach 1:
The patent changes the particle size parameter of metallic pigments from conventional large flakes to nano-particles, enabling compatibility with standard inkjet printing systems. This eliminates the need for expensive thermal transfer equipment and donor sheets, significantly reducing proofing costs while maintaining metallic appearance quality.
3Reliability
If conventional metal flake ink is used, then metallic appearance is achieved, but the ink cannot be passed through inkjet head
Solution Approach 1:
The patent changes the particle size parameter of metallic pigments from conventional large flakes (tens to hundreds of microns) to nano-particles (nanometer scale). This parameter change enables the metallic ink to be jetted through standard inkjet heads while maintaining metallic appearance, thus resolving the contradiction between achieving metallic quality and maintaining fast proofing speed.
Solution Approach 2:
The patent segments the metallic pigment into nano-scale particles rather than using large continuous flakes. This segmentation allows the pigment to pass through the narrow orifice of inkjet heads while still providing metallic appearance when deposited on the substrate.
4Adaptability or versatility
If multiple donor rolls with varying metallic pigments are used to achieve different brightness levels, then various metallic appearances can be produced, but the system complexity and inventory requirements increase
Solution Approach 1:
The patent makes a single nano-particle metallic ink formulation capable of producing multiple metallic appearances (bright silver, medium, dull, oxidized aluminum) by varying halftone levels and printing parameters. This universal ink replaces the need for multiple specialized donor rolls, reducing system complexity and inventory requirements while maintaining versatility.
Solution Approach 2:
The patent introduces dynamic control of halftone levels to vary the metallic appearance from a single ink formulation. By dynamically adjusting the halftone percentage and printing parameters, the system can produce various metallic appearances on demand without requiring multiple static donor rolls.
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 enables the production of a wide range of metallic appearances from bright silver to dull aluminum, efficiently and inexpensively, using inkjet printing, allowing for precise matching of packaging designs and reducing the need for multiple donor rolls and expensive imaging systems.
Implementation Method 1
A method for adjusting the appearance of an inkjet printed metallic ink by controlling the halftone level, the substrate surface properties and the presence of other colored inks
Implementation Method 2
by changing halftone level of the silver inks, changing the substrate surface properties and introducing small amounts of other colored inks
Data Source
AI summary
A system and method for producing a wide range of metallic appearances using halftones of a nano-particle metallic ink, such as, for example, nano-silver, are presented. In exemplary embodiments of the present invention, a nano-particle metallic ink, such as, for example, nano-silver, can be made to produce a range of appearances from, for example, bright silver to dull oxidized aluminum, by changing halftone level of the silver inks, changing the substrate surface properties and introducing small amounts of other colored inks, such as process or spot, in either an underprinting or overprinting of the metallic ink. In exemplary embodiments of the present invention, InkJet printing of a single metal-pigmented ink can be effected, and its metallic appearance can very quickly be adjusted to match a given package design.