Roll-to-roll Fabricated Micro-pump with Releasable Valves
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Solution Overview
Problem
Existing microelectromechanical systems (MEMS) manufacturing methods are inefficient and costly for producing micro-pumps with releasable and moveable features, as they require complex and resource-intensive processes.
Innovation Solution
The implementation of roll-to-roll (R2R) fabrication techniques to pattern and laminate flexible plastic sheets with metal coatings, creating composite structures with releasable and moveable elements like T-shaped and Omega-shaped valve members, which are then stacked and diced into individual micro-pump components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional MEMS manufacturing methods are used, then manufacturing precision can be maintained, but productivity is low and manufacturing cost is high
Solution Approach 1:
The device is divided into multiple layers (first flexible layer with inlet valve, second flexible layer with outlet valve, rigid body layer) that can be independently fabricated and then assembled. This segmentation allows parallel processing of different layers, improving productivity while maintaining manufacturing precision through specialized processing for each layer type.
Solution Approach 2:
The flexible plastic layers serve multiple functions: they form the structural body of the micro-pump, contain the valves, provide fluid channels, and enable mechanical movement. This multi-functionality reduces the number of separate components needed, simplifying manufacturing while maintaining device performance.
2Manufacturing precision
If complex patterning processes are used to create moveable features, then manufacturing precision is maintained, but loss of time increases
Solution Approach 1:
The metal coating is applied to the flexible layers before the valve features are patterned. This preliminary action allows the metal to serve as a sacrificial release agent during subsequent processing, enabling easy release of moveable valves from molds without requiring complex real-time patterning operations.
Solution Approach 2:
The metal coating layer acts as an intermediary between the flexible plastic layer and the molding process. It facilitates the release of patterned features from molds during fabrication and enables precise feature formation without direct complex patterning of the plastic itself.
3Strength
If metal coatings are applied to flexible layers, then strength of moveable features is improved, but use of energy increases due to additional deposition processes
Solution Approach 1:
The metal coating is applied selectively only to specific regions of the flexible layers where valve features and moveable elements will be formed, rather than coating the entire surface. This localized coating provides strength where needed while minimizing material usage and associated energy consumption.
Solution Approach 2:
The device uses composite structures combining flexible plastic layers with metal coatings. This composite approach leverages the flexibility and formability of plastic with the strength and structural integrity of metal, achieving enhanced mechanical properties for moveable features while using thin metal layers that minimize deposition energy requirements.
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 method allows for the cost-effective and efficient production of micro-pumps with enhanced mechanical properties, reduced material stress, and lower power consumption, enabling a wide range of flow rates and pressures.
Implementation Method 1
laminating a second sheet of a flexible plastic material to the first sheet to provide a composite laminated structure
Implementation Method 2
patterning the first sheet includes ablating, and produces the first metallic region and a second metallic region on the first sheet
Data Source
Figure 1A~1B
Figure 2A
Figure 2B
AI summary
Roll to roll processing techniques are described to produce microelectromechanical systems having releasable and moveable mechanical structures. A micro-pump that includes a pump body having compartmentalized pump chambers, with plural inlet and outlet ports and valves and plural membranes enclosing the pump chambers is described as a representative example.