Multi-Roller Drying Device for High-Speed Inkjet Printing
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Solution Overview
Problem
Conventional drying devices face challenges in efficiently drying continuous sheets with high-speed printing, as excessive heating temperatures can cause the sheet to turn yellow or lead to ink peeling, and maintaining stable drying quality across varying sheet thicknesses and speeds is difficult.
Innovation Solution
The proposed drying device employs multiple heat rollers with varying heating temperatures, including some with higher temperatures than the heat drum, to ensure efficient drying by maintaining the sheet's temperature close to the heat drum's temperature, while also using guide rollers with enhanced surface properties to prevent ink film breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single heat drum is used to heat the continuous sheet, then the structure is simple, but the drying efficiency is insufficient for high-speed printing
Solution Approach 1:
The drying device is segmented into multiple independent heat rollers (first heating bodies) arranged in series, each capable of heating the continuous sheet. This segmentation allows the sheet to receive cumulative heating from multiple sources, significantly improving drying efficiency for high-speed printing while maintaining modular simplicity
Solution Approach 2:
Multiple heat rollers are combined with a heat drum (second heating body) to create a composite heating system. The heat rollers provide initial heating stages, and the heat drum provides final drying, merging simple roller heating with drum heating to achieve high efficiency without excessive complexity
2Loss of time
If high heating temperature is applied to dry the liquid quickly, then drying time is reduced, but the continuous sheet turns yellow or ink peels
Solution Approach 1:
The heating process is segmented into multiple stages across several heat rollers, each operating at controlled temperatures. This gradual heating approach reduces drying time while preventing the sheet from experiencing excessive temperature that would cause yellowing or ink peeling
Solution Approach 2:
Different heat rollers are configured with different heating characteristics (some with higher temperatures than the heat drum) to provide localized heating appropriate for different stages of the drying process, ensuring efficient drying without harmful effects
3Manufacturing precision
If multiple heat rollers with varying temperatures are used, then drying quality is improved, but the device complexity increases
Solution Approach 1:
Each heat roller is designed with specific local heating characteristics, including varying temperatures (with some exceeding the heat drum temperature) and different surface properties. This local quality optimization ensures stable drying quality across varying sheet thicknesses and speeds
Solution Approach 2:
Guide rollers with enhanced surface properties serve as intermediaries between the heat rollers and the continuous sheet. These guide rollers help distribute heat evenly and prevent direct contact issues, maintaining drying quality while simplifying the overall system design
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 configuration reduces drying time, maintains high printing quality by preventing voids and ink peeling, and allows for stable drying across different sheet thicknesses and speeds, while also enhancing energy efficiency.
Implementation Method 1
multiple heat rollers, each having a small diameter, to heat a continuous sheet, and a heat drum having a large diameter to heat the continuous sheet
Implementation Method 2
one or more first heating bodies configured to heat a drying target object conveyed with liquid applied on the drying target object, and a second heating body configured to heat the drying target object after the drying target object is heated by the one or more first heating bodies
Implementation Method 3
drying device including one or more first heating bodies configured to heat a drying target object conveyed with liquid applied on the drying target object
Data Source
AI summary
A drying device includes one or more first heating bodies configured to heat a drying target object conveyed with liquid applied on the drying target object, and a second heating body configured to heat the drying target object after the drying target object is heated by the one or more first heating bodies. The one or more first heating bodies include at least one heating body configured to heat the drying target object at a heating temperature greater than a heating temperature of the second heating body.