Liquid Droplet Jetting Head Circulation Channel Vacuum Printing
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Solution Overview
Problem
Existing liquid droplet jetting systems face challenges in maintaining a stable jetting state, especially in reduced pressure environments where ink solvent evaporation can deteriorate the jetting process.
Innovation Solution
A liquid droplet jetting apparatus is designed with a circulation flow channel within the jetting head, which circulates the liquid during printing to maintain a stable jetting state. This apparatus also creates a vacuum between the jetting head and the substrate, reducing air resistance and enhancing jetting accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a vacuum environment is created between the jetting head and substrate to reduce air resistance, then jetting accuracy is improved, but solvent evaporation occurs which deteriorates the jetting state
Solution Approach 1:
The circulation flow channel is pre-configured within the jetting head to continuously supply fresh liquid to the nozzle before jetting occurs. This preliminary action ensures that the liquid at the nozzle is always in a stable state, preventing solvent evaporation from affecting jetting accuracy in the vacuum environment
Solution Approach 2:
The circulation flow channel acts as an intermediary system between the liquid reservoir and the nozzle, maintaining a stable liquid state through continuous circulation. This intermediary mechanism isolates the nozzle from the vacuum environment's harmful effects while still allowing accurate jetting
2Adaptability or versatility
If the distance between the ink jet head and the substrate is increased to expand application range, then versatility is improved, but air resistance affects the liquid droplets which deteriorates jetting precision
Solution Approach 1:
A vacuum environment is created between the jetting head and substrate, which acts as an inert environment with reduced air resistance. This allows liquid droplets to travel longer distances without being affected by air drag, enabling increased distance between head and substrate while maintaining jetting precision
Solution Approach 2:
The circulation flow channel pre-stabilizes the liquid before it reaches the nozzle, ensuring that the liquid properties remain consistent even when traveling through the vacuum environment over longer distances, thus maintaining jetting precision
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
The system effectively maintains a good jetting state even in reduced pressure environments by preventing solvent evaporation and reducing air resistance, allowing for accurate and stable ink droplet placement on the substrate.
Implementation Method 1
the liquid droplet jetting head includes a circulation flow channel inside the liquid droplet jetting head, and the control device circulates the liquid through the circulation flow channel at least during printing
Implementation Method 2
a space between the liquid droplet jetting head and the substrate is a vacuum
Implementation Method 3
there is an issue in that it is desired to land liquid droplets onto a substrate without being strongly affected by air resistance even in a case in which a distance between an ink jet head and the substrate is wide
Implementation Method 4
the control device supplies the liquid from the first liquid tank to the liquid droplet jetting head by using a head difference, and recovers the liquid from the liquid droplet jetting head to the second liquid tank by using the head difference
Data Source
AI summary
Provided are a liquid droplet jetting apparatus and a manufacturing method of a printed article that maintain a good jetting state regardless of an ink to be used. A liquid droplet jetting apparatus includes: a liquid droplet jetting head that jets a liquid; a relative movement mechanism that moves a substrate and the liquid droplet jetting head relative to each other; and a control device that moves the substrate and the liquid droplet jetting head relative to each other and causes the liquid droplet jetting head to jet the liquid, to print an image on the substrate, in which a space between the liquid droplet jetting head and the substrate is a vacuum, the liquid droplet jetting head includes a circulation flow channel for circulating the liquid, and the control device circulates the liquid at least during printing.