Microwave Ink Drying Using Paired Cavity Uniformity
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Solution Overview
Problem
Ink jet printing faces challenges in rapid ink drying, especially in humid environments, due to inefficient heat coupling methods that result in extended drying times and high power consumption.
Innovation Solution
An ink jet printer system incorporating a microwave transparent substrate and a microwave emitter with paired cavities that emit microwave power uniformly across the substrate to reduce moisture content in the ink, ensuring consistent power distribution and efficient drying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional heating methods are used to dry ink, then the drying process can be implemented, but the heat coupling efficiency is poor resulting in extended drying times
Solution Approach 1:
The patent replaces conventional thermal heating mechanisms with microwave radiation. The microwave emitter generates electromagnetic waves that directly excite water molecules in the ink, providing internal heating rather than external heat transfer. This substitution of heating mechanism dramatically improves both drying speed and energy coupling efficiency.
Solution Approach 2:
The patent changes the heating parameter from thermal conduction/convection to electromagnetic radiation at microwave frequencies. By using microwave radiation with specific frequency characteristics, the system achieves direct molecular excitation and rapid heating, transforming the drying process from slow external heating to rapid internal heating.
2Loss of energy
If conventional heating methods are used to dry ink, then the drying process can be implemented, but power consumption is higher than minimally necessary
Solution Approach 1:
The patent replaces inefficient thermal heating systems with microwave radiation systems. Microwave emitters generate electromagnetic energy that is directly absorbed by water molecules, eliminating the need for high-power thermal heating equipment and reducing overall power consumption while maintaining or improving drying efficiency.
Solution Approach 2:
The microwave heating process is self-limiting and self-regulating. The microwave energy is selectively absorbed by water molecules in the ink, and the heating stops automatically when the moisture is removed. This eliminates the need for excessive power input and allows the system to consume only the minimum necessary energy for effective drying.
3Productivity
If microwave power is applied to dry ink, then drying speed improves, but uniform power distribution across the substrate is difficult to achieve
Solution Approach 1:
The patent divides the microwave emission system into multiple emitters positioned at different locations. Each emitter contributes to the overall power distribution, and by coordinating their output, the system achieves uniform total power distribution across the substrate. This segmentation of the heating function resolves the uniformity problem.
Solution Approach 2:
The patent employs time-varying or modulated microwave emission patterns. By varying the emission timing or intensity of different microwave sources, the system compensates for spatial variations in power distribution. This periodic or dynamic control ensures that all regions of the substrate receive substantially equal total power despite differences in geometric positioning.
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 enables rapid, uniform, and energy-efficient ink drying by predominantly absorbing microwave energy within the ink, reducing heating times and energy usage while maintaining image quality.
Implementation Method 1
The microwave emitter is configured to emit microwave power at a wavelength (λ). The at least one cavity has an outlet disposed adjacent the microwave transparent substrate and is adapted to receive and output an amount of the microwave power at the outlet to excite molecules within the ink jetted material and reduce a moisture content of the ink jetted material.
Implementation Method 2
a microwave transparent substrate (having low microwave absorption)
Data Source
AI summary
An ink jet printer includes a microwave transparent substrate, a microwave emitter, and at least one cavity. The microwave transparent substrate is operationally movable along a first direction and is adapted to receive an ink jetted material thereon. The microwave emitter is configured to emit microwave energy at a wavelength (λ). The at least one cavity has an outlet disposed adjacent the microwave transparent substrate and is adapted to receive and output an amount of the microwave energy at the outlet to reduce a moisture content of the ink jetted material. The amount of microwave energy output to the ink jetted material is substantially constant as measured along a second direction transverse to the first direction.