Bio-Renewable Intaglio Ink Composition for Reduced Set-Off
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Solution Overview
Problem
Existing oxidatively drying intaglio inks used in security documents suffer from set-off issues, particularly exacerbated by the pronounced relief of intaglio printed patterns, and there is a need for bio-renewable inks with improved drying performance and reduced set-off characteristics.
Innovation Solution
The development of an oxidatively drying intaglio ink comprising oxidatively drying varnishes, driers, fillers, and waxes with specific melting points and acid values, along with a method for applying and drying the ink to form security features on substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If oxidatively drying inks are used for intaglio printing to achieve high-quality fine lines and variable ink thickness, then printing quality and security feature detection capability are improved, but set-off problem is worsened due to pronounced relief of printed patterns
Solution Approach 1:
The patent modifies the chemical parameters of the ink by incorporating specific bio-renewable waxes with controlled melting points (below 100°C) and high acid values (≥90 mg KOH/g). These parameter changes alter the ink's drying characteristics and reduce set-off while preserving intaglio printing quality
Solution Approach 2:
The patent creates a composite ink formulation combining oxidatively drying varnishes, driers, fillers, and specific bio-renewable waxes (long-chain aliphatic carboxylic acids and esters). This composite material approach integrates multiple functional components to achieve both high printing quality and reduced set-off
2Duration of action of moving object
If conventional oxidatively drying inks are used to achieve adequate drying performance, then drying function is satisfied, but set-off issue is pronounced and requires extensive ink formulation optimization
Solution Approach 1:
The patent changes the chemical composition parameters by introducing bio-renewable waxes with specific acid values (≥90 mg KOH/g) and melting points. These parameter modifications optimize both drying performance and set-off characteristics simultaneously
Solution Approach 2:
The patent utilizes oxidatively drying varnishes that dry by oxidation in the presence of atmospheric oxygen, with the process accelerated by metallic salt driers. This oxidation mechanism provides rapid drying while the specific wax composition mitigates set-off
3Reliability
If traditional ink formulations are used for intaglio printing, then printing process is established, but environmental sustainability is compromised and bio-renewable requirements are not met
Solution Approach 1:
The patent replaces traditional petroleum-based components with bio-renewable alternatives, changing the origin parameter of the ink ingredients. The bio-renewable waxes maintain the necessary functional parameters (melting point, acid value) while improving environmental sustainability
Solution Approach 2:
The patent formulates a composite ink system where bio-renewable components (oxidatively drying varnishes of vegetable origin, bio-renewable waxes) are combined with functional additives (driers, fillers). This composite approach ensures both process reliability and environmental benefits
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 solution effectively reduces set-off issues while maintaining good drying performance, utilizing bio-renewable ingredients that enhance environmental sustainability.
Implementation Method 1
Oxidatively drying inks are commonly used for intaglio printing processes. These inks dry by oxidation in the presence of oxygen, in particular in the presence of the oxygen of the atmosphere. During the drying process, the oxygen combines with one or more components of the ink vehicle, converting the ink to a semi-solid or a solid state.
Implementation Method 2
one or more waxes, wherein each wax independently has a melting point less than about 100°C and an acid value of greater than or equal to about 90 mg KOH/g
Data Source
AI summary
The invention provides a bio-renewable intaglio ink showing good set-off characteristics.