Dielectric Drying Device with Conductive Shield for Inkjet Printing
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Solution Overview
Problem
High-speed inkjet printing machines face issues with ink drying speed not matching printing speed, leading to problems like offset, blocking, and color fading, especially when using inks with conductive particles like carbon black, which can cause anomalous heating or sparking during high-frequency dielectric drying.
Innovation Solution
A drying device configuration that controls the drying process to stop just before an increase in conductivity, using high-frequency dielectric heating units with a conductive member to manage electrical fields and prevent sparking, and an auxiliary drying unit for complete solvent drying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-frequency dielectric drying is used to achieve fast drying speed, then drying speed is improved, but anomalous heating or sparking occurs when using inks with conductive particles
Solution Approach 1:
A conductive member (such as a conductive sheet or mesh) is introduced as an intermediary between the high-frequency dielectric drying unit and the printed medium. This conductive member serves as a shield that prevents direct interaction between the high-frequency electric field and the conductive particles in the ink, thereby eliminating anomalous heating and sparking while maintaining effective drying through dielectric heating of the ink solvent.
2Reliability
If natural drying is used to avoid anomalous heating, then safety is improved, but drying speed cannot keep up with high-speed printing
Solution Approach 1:
The conductive member acts as a mediator that enables the use of high-frequency dielectric drying (which provides fast drying speed) while preventing the harmful effects (anomalous heating and sparking). This resolves the contradiction by allowing the drying process to proceed rapidly without compromising safety, as the conductive member blocks the direct interaction between the electric field and conductive ink particles.
Solution Approach 2:
The invention changes the electrical conductivity parameter of the drying system by introducing a conductive member with controlled conductivity. This modifies the electric field distribution and prevents the formation of high-current paths through the conductive ink particles, thereby enabling safe high-speed drying without anomalous heating or sparking.
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
Enables efficient ink drying without anomalous heating or sparking, even with conductive materials, ensuring consistent output and preventing thermal runaway, thus enhancing energy efficiency and print quality.
Implementation Method 1
a drying unit implementing high-frequency dielectric drying is known that can be built with a simple configuration
Data Source
AI summary
A drying device includes: a dielectric heating unit configured to apply an alternating electrical field to a medium onto which a liquid containing a conductive material, water, and a solvent has been discharged, and perform dielectric heating of the liquid; and a conductive member disposed either to make contact with or to be close to the medium to which the alternating electrical field is being applied.