Low Surface Energy Orifice Layer for Precise Fluid Dispensing
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Solution Overview
Problem
Existing fluid dispensing technologies face issues with fluid adhesion and pooling, leading to inaccurate dispensing and increased costs due to the need for expensive serial dilution processes when handling small volumes, particularly in precision applications like titration.
Innovation Solution
A fluid dispensing tool with a low surface energy orifice layer, integrated into a thermal inkjet printhead, reduces fluid adhesion and pooling by using a low surface energy coating on the orifice, allowing for precise and efficient dispensing of small volumes without drooling and pooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional orifice surfaces are used, then fluid dispensing can be achieved, but fluid adhesion causes pooling and drooling leading to inaccurate dispensing
Solution Approach 1:
The patent applies parameter changes by modifying the surface energy characteristics of the orifice layer. A low surface energy coating (such as fluorinated or silane-based materials) is applied to the orifice surface, changing the surface energy parameter from conventional high adhesion surfaces to low adhesion surfaces. This parameter change reduces fluid adhesion forces, preventing pooling and drooling while maintaining precise dispensing accuracy.
2Quantity of substance
If expensive serial dilution processes are used, then small volumes can be dispensed, but cost and complexity increase
Solution Approach 1:
The patent extracts and eliminates the need for expensive serial dilution processes by directly enabling precise dispensing of small volumes through the low surface energy orifice layer. The orifice design allows direct dispensing of accurate small volumes without requiring intermediate dilution steps, thereby removing the complexity and cost associated with serial dilution while maintaining the ability to dispense small quantities of fluid.
3Productivity
If fluid pooling occurs on the printhead surface, then dispensing speed decreases, but reliability is compromised
Solution Approach 1:
The patent resolves this contradiction by changing the surface energy parameter of the orifice layer to low surface energy materials. This parameter change reduces fluid adhesion, preventing pooling that would otherwise slow dispensing speed. By maintaining a clear orifice surface free from pooling, the system achieves both high dispensing speed and high reliability, as the low surface energy coating prevents the formation of pools that would compromise dispensing consistency.
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 solution enables reliable, precise, and cost-effective dispensing of small fluid volumes with minimal pooling and drooling, enhancing dispensing speed and reliability, and is applicable to various precision operations such as titration processes.
Implementation Method 1
a low surface energy orifice layer, which limits fluid adhesion to surfaces of the low surface energy orifice
Data Source
AI summary
The present invention is embodied in a method for precisely dispensing fluid, including treating an orifice of a fluid dispensing apparatus during a fabrication process by applying a low surface energy material layer onto the orifice, adjusting a thickness of the low surface energy material coating to a predetermined threshold and limiting backpressure of a low dead volume fluid delivery system coupled to the orifice to reduce interference or interruptions for precisely dispensing the fluid.