Selective Nozzle Activation for High-Viscosity Area Printing
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Solution Overview
Problem
Existing printing devices face challenges in effectively discharging high viscous fluids while minimizing electric field interference between nozzles, which hinders efficient area printing.
Innovation Solution
The printing device incorporates a reservoir with nozzles having nozzle holes surrounded by electrodes and insulating layers, allowing for controlled discharge of high viscous fluids through selective nozzle activation, reducing electric field interference by optimizing nozzle spacing and using controlled voltage application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If nozzle holes are arranged close together to enable area printing, then printing area coverage is improved, but electric field interference between nozzles increases
Solution Approach 1:
An insulating layer is introduced between adjacent nozzles to act as an intermediary that blocks electric field interference. This insulating layer prevents direct electrostatic interaction between neighboring nozzle holes, allowing them to be positioned close together for area printing without experiencing harmful electric field coupling.
Solution Approach 2:
The printing device is segmented into electrically isolated nozzle units, each with its own electrode and insulating structure. This segmentation allows independent control of each nozzle while preventing electric field interference between adjacent nozzles, enabling both area printing capability and precise droplet placement.
2Stability of the object's composition
If high viscous fluid is used to achieve stable discharge, then discharge stability is improved, but discharge difficulty increases
Solution Approach 1:
The patent replaces mechanical pressure-driven discharge with electrohydrodynamic discharge. By applying an electric field to the high viscous fluid, the electrostatic force overcomes the fluid's viscosity and enables stable droplet formation and discharge, eliminating the need for high mechanical pressure and complex pumping mechanisms.
Solution Approach 2:
The patent changes the physical parameter used for discharge from mechanical pressure to electric field strength. By controlling the voltage applied to the electrode, the discharge characteristics of high viscous fluid can be precisely controlled, achieving stable droplet ejection without requiring the fluid to be pumped at high pressure.
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 stable discharge of high viscous fluids, facilitating area printing by minimizing electric field interference and allowing for precise pattern formation on targets.
Implementation Method 1
a printing device to which an electrohydrodynamic printing method is applied may form an electric field between a nozzle and a target and apply an electrostatic force to a fluid, thereby discharging the fluid in the form of a droplet
Implementation Method 2
first insulating layer surrounding the first electrodes
Data Source
AI summary
A printing device includes a reservoir accommodating a fluid, a first nozzle disposed on the bottom of the reservoir, the first nozzle including a plurality of nozzle holes through which the fluid is discharged as a droplet, first electrodes disposed on at least a portion of the bottom of the first nozzle, corresponding to the plurality of nozzle holes and a first insulating layer surrounding the first electrodes.