Dryer System for Inkjet Media Cosolvent Absorption
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Solution Overview
Problem
Inkjet printing devices face challenges in completely removing cosolvents from the surface of recording media during the drying process, which affects the wear resistance and adhesion of print images, as cosolvents are not fully absorbed due to high viscosity issues.
Innovation Solution
A method and dryer system that adjust the evaporation rate and temperature of the fluid mixture to optimize the absorption of cosolvents into the recording medium, using a combination of convection, radiant, and thermal conductivity dryers to maintain an optimal temperature and cosolvent proportion for extended periods, ensuring complete absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the drying process is accelerated to improve productivity, then the drying time is reduced, but the cosolvent absorption is incomplete leading to poor wear resistance
Solution Approach 1:
The drying process is divided into multiple distinct phases: an initial phase with higher temperature to rapidly evaporate water and reduce viscosity, followed by a second phase with lower temperature to allow complete cosolvent absorption. This segmentation enables the system to achieve both fast drying and complete absorption, resolving the contradiction between productivity and wear resistance.
Solution Approach 2:
The drying process dynamically adjusts temperature conditions based on the absorption state of the cosolvent. The system transitions from a first temperature condition (higher) to a second temperature condition (lower) as the process progresses, optimizing both drying speed and absorption completeness at different stages, thereby resolving the contradiction between speed and quality.
2Productivity
If the temperature is increased to accelerate evaporation, then the drying efficiency is improved, but the cosolvent viscosity increases reducing absorption
Solution Approach 1:
The temperature profile is segmented into two distinct conditions: a first temperature condition that promotes rapid water evaporation and viscosity reduction, and a second temperature condition that facilitates complete cosolvent absorption. This temporal segmentation of temperature conditions resolves the contradiction between evaporation rate and absorption quantity.
Solution Approach 2:
The drying process employs periodic temperature variation, alternating between higher temperature periods for evaporation and lower temperature periods for absorption. This periodic action allows the system to achieve both high evaporation rates and complete cosolvent absorption, resolving the contradiction between these two parameters.
3Device complexity
If conventional drying methods are used, then the process is simple, but the cosolvent remains on the surface affecting print quality
Solution Approach 1:
The drying process is segmented into multiple phases with different temperature conditions and duration parameters. This segmented approach, while increasing process complexity, ensures complete cosolvent absorption and eliminates surface residue, thereby improving print image quality and adhesion properties.
Solution Approach 2:
The drying process utilizes controlled changes in temperature parameters and time duration to optimize both cosolvent absorption and water evaporation. By carefully adjusting these parameters through multiple phases, the system achieves complete absorption while maintaining manageable process complexity, resolving the contradiction between simplicity and quality.
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 approach ensures the cosolvent is effectively absorbed, enhancing the wear resistance and quality of the print image while reducing the drying time and cosolvent residue on the surface.
Implementation Method 1
supplying thermal energy to the fluid mixture in such a way that an evaporation rate of the first component is controlled
Implementation Method 2
adapt the evaporation rate of the first component during the drying process
Implementation Method 3
absorption of the second component into the substrate
Implementation Method 4
absorption parameter which depends on the proportion of the second component in the fluid mixture on the surface of the substrate and on the viscosity of the fluid mixture
Data Source
AI summary
Thermal energy is supplied to a fluid mixture on a substrate that has a first component, for example water, and a second component, for example cosolvent, such that the proportion of the second component in the fluid mixture is increased at relatively high temperatures of the fluid mixture. It may thus be reliably produced that an optimally small quantity of the second component is located on the surface of the substrate following the drying process.