Solvent-Based Inkjet Ink Formulations for Extended Decap Time
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Solution Overview
Problem
Inkjet printers face issues with nozzle clogging due to evaporation of organic solvents, leading to reduced decap time and increased need for printhead servicing, which can result in printing defects and inefficiencies.
Innovation Solution
Development of solvent-based inkjet ink formulations that include a combination of organic solvents, resins, and surfactants, specifically designed to extend decap time without compromising drying time, using fast, intermediate, or slow solvents in various ratios to maintain ink fluidity and prevent evaporation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If less volatile solvents with lower vapor pressure are used to achieve longer decap time, then decap time is extended, but drying time increases causing smearing of the print
Solution Approach 1:
The ink formulation is segmented into multiple solvent components with different volatility characteristics (fast evaporating, intermediate evaporating, and slow evaporating solvents). This segmentation allows each component to perform its specific function: fast solvents provide immediate drying, while slow solvents extend decap time, resolving the contradiction between quick drying and extended operational readiness.
Solution Approach 2:
The invention changes the parameters of the solvent system by carefully controlling the ratios of fast, intermediate, and slow evaporating solvents. By adjusting these parameters (evaporation rates, viscosity, surface tension), the formulation achieves both fast drying time and extended decap time, preventing both smearing and nozzle clogging.
2Stability of the object's composition
If organic solvents are used in inkjet ink, then ink fluidity is maintained, but evaporation from nozzle interface causes clogging and reduces decap time
Solution Approach 1:
The invention changes the volatility parameters of the organic solvent system by incorporating slow evaporating solvents (such as glycol ethers) that maintain ink fluidity in the reservoir and nozzle while evaporating slowly enough to prevent clogging. This parameter change extends decap time from minutes to hours or days while preserving ink flow properties.
Solution Approach 2:
The ink formulation uses a composite solvent system combining multiple organic solvents with different evaporation rates. This composite approach allows the fast evaporating components to provide initial drying, while slow evaporating components maintain fluidity and extend decap time, resolving the contradiction between fluidity and reliability.
3Manufacturing precision
If printhead servicing is performed frequently to prevent clogging, then printing quality is maintained, but ink is wasted and printer availability decreases
Solution Approach 1:
The invention converts the potentially harmful effect of organic solvent evaporation into a beneficial extended decap time by using slow evaporating solvents. This transforms what would normally be a clogging problem into an advantage, allowing the printhead to remain operational for extended periods without servicing, thus maintaining printing quality while improving printer availability.
Solution Approach 2:
The ink formulation provides self-service functionality by maintaining nozzle patency through its extended decap time properties. The slow evaporating solvents continuously protect the nozzle from clogging during idle periods, eliminating the need for external servicing operations and maximizing printer productivity.
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 ink formulations achieve extended decap times of up to several days, reducing the frequency of printhead maintenance and ensuring high-quality printing with minimal intervention, while maintaining fast drying times and reasonable viscosity and surface tension.
Implementation Method 1
Clogging can be caused by evaporation of an organic solvent or water from the interface of the liquid at the surface and/or within the nozzle
Implementation Method 2
The ink formulations achieve extended decap times of up to several days, reducing the frequency of printhead maintenance and ensuring high-quality printing with minimal intervention, while maintaining fast drying times and reasonable viscosity and surface tension
Data Source
AI summary
Solvent-based inkjet ink formulations including an organic solvent, a resin, a surfactant, and a colorant are provided. The inks have many desirable attributes such as extended decap time.