Dispense Head Surface Pattern Limits Fluid Puddle Volume
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Solution Overview
Problem
Ink jetting printers and laboratory equipment often experience fluid puddle formation on the outer surface of dispense heads, leading to incomplete dispensing into wellplates or undesirable artifacts on printed media due to insufficient fluid containment.
Innovation Solution
A dispense head with a surface pattern featuring voids or channels extending inward from the outer surface, which limits fluid puddle volume by altering the surface geometry and utilizing surface tension to prevent puddle growth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluid is ejected from nozzles during normal operation, then dispensing function is achieved, but fluid puddle formation occurs on the outer surface
Solution Approach 1:
The outer surface is segmented into multiple regions by creating an array of cavities that divide the continuous surface into discrete zones. Each cavity acts as an independent containment region, preventing fluid from spreading across the entire surface and forming large puddles that cause dispensing errors.
Solution Approach 2:
The surface geometry is modified locally by creating cavities with specific dimensions and distributions tailored to control fluid behavior in different areas. The cavity depth, width, and spacing are optimized to match the fluid ejection characteristics, providing localized fluid containment exactly where needed while maintaining other surface properties.
2Object-generated harmful factors
If surface pattern with voids is created to limit puddle volume, then fluid containment is improved, but device complexity increases
Solution Approach 1:
The cavity array structure is designed to be self-forming through standard manufacturing processes. The voids are created as integral part of the substrate geometry rather than requiring additional components or assembly steps, allowing the structure to limit fluid puddle volume while avoiding significant increases in device complexity.
3Manufacturing precision
If cavity depth is increased to reduce puddle volume, then fluid containment control is improved, but manufacturing difficulty increases
Solution Approach 1:
The cavity parameters (depth, width, spacing, shape) are systematically varied and optimized to achieve the desired fluid containment performance. By adjusting these geometric parameters within manufacturable ranges, precise control over puddle volume is achieved without requiring excessively deep or complex cavity structures that would be difficult to manufacture.
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 surface pattern effectively reduces or eliminates dispensing errors and undesirable artifacts by controlling fluid puddle size, ensuring accurate and complete fluid dispensing onto receiving entities.
Implementation Method 1
utilizing surface tension to prevent puddle growth
Data Source
AI summary
Methods and apparatus are provided related to fluid dispensing heads. A dispense head is formed to define a plurality of fluid jetting nozzles and a surface pattern. The surface pattern is characterized by one or more voids extending inward from an outer surface of the dispense head. Fluid puddle formation during operation of the dispense head is limited in volume by way of the surface pattern. Fluid puddle limiting reduces or eliminates dispensing errors to an entity, undesirable artifacts from resulting on a printed media, or similar problems.