Microscale In-Situ Sealing for Dissimilar Plies
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Solution Overview
Problem
Existing methods for microscale sealing and lining between dissimilar materials face challenges in achieving effective seals with minimal adhesive gaps and precise placement, especially in microfluidic devices, where conventional techniques become impractical and expensive due to the difficulty in pre-fabricating and manipulating microscale seals.
Innovation Solution
A method of creating fluidly continuous channels and recesses on a microscale within one of the plies using microfluidic techniques, allowing for in-situ formation of seals and channel linings without the need for pre-fabricated seals, using curable materials that can be introduced through feed channels and cured to form effective bonds or seals between plies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pre-fabricated seals are used for microscale sealing, then sealing effectiveness can be achieved, but the difficulty of manipulation and accurate location increases significantly
Solution Approach 1:
The seal is formed in-situ within the recess itself, eliminating the need for separate pre-fabricated seal components. The curable material is introduced through feed channels and cured directly in the recess, making the sealing structure self-forming and self-positioning, which resolves the manipulation and location difficulties while maintaining sealing effectiveness
Solution Approach 2:
The sealing function is merged with the recess structure itself. Rather than using a separate seal component placed in the recess, the seal is formed as an integral part of the recess by curing material in-situ, combining the recess and seal into a single unified structure that eliminates positioning errors
2Ease of manufacture
If conventional fabrication techniques are used for grooves, then sealing structures can be created, but the process does not scale down to microscale effectively
Solution Approach 1:
Conventional mechanical machining and molding techniques are replaced with microfluidic techniques for creating the recess and feed channels. The microfluidic approach uses fluid flow and curing processes instead of mechanical tools, enabling precise microscale feature fabrication that conventional mechanics cannot achieve
Solution Approach 2:
The fabrication approach transitions from macro-scale mechanical parameters to micro-scale fluid dynamic parameters. By controlling fluid flow rates, pressure, and curing conditions rather than mechanical cutting forces, the process achieves the necessary microscale precision that mechanical methods cannot provide
3Strength
If adhesive layers are inserted between plies, then bonding can be achieved, but the seal precision and location accuracy deteriorates
Solution Approach 1:
The adhesive layer is extracted and replaced with a curable material that is introduced through feed channels and cured in-situ. This eliminates the need for manual adhesive application and the associated positioning errors, while the curing process ensures complete filling and precise location accuracy
Solution Approach 2:
The feed channels act as intermediaries for introducing the curable material. Rather than applying adhesive directly between plies (which causes positioning errors), the material is delivered through controlled feed channels that guide it precisely to the recess location, ensuring accurate seal placement
4Reliability
If microscale seals are pre-fabricated, then sealing function can be provided, but the fabrication cost becomes prohibitively expensive
Solution Approach 1:
The sealing structure is self-forming through in-situ curing of material introduced via feed channels. This eliminates the expensive separate fabrication step for pre-made seals, reducing manufacturing cost while maintaining the sealing function through the cured material in the recess
Solution Approach 2:
The same microfluidic recess fabrication technique used for creating channels is also used for creating the seal recesses. This multi-functional approach uses a single fabrication process for both fluid channels and sealing structures, eliminating the need for separate expensive seal fabrication equipment and processes
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 approach enables precise and cost-effective microscale sealing and lining, eliminating the need for pre-fabricated seals and allowing for the creation of complex structures with different materials and properties, suitable for microfluidic applications, while avoiding thermal damage to sensitive areas.
Implementation Method 1
introducing a liquid or gel precursor to a curable material into a recess formed in a base ply so as to define a channel together with a lid ply and curing the curable material in-situ within the channel so as to form a seal and channel lining
Data Source
AI summary
A method of providing a fine line adhesive bond and/ or seal or gasket and/ or lined channel, and in particular a fine line bonding seal, between a first (14) and a second ply (16) , especially of dissimilar materials, comprises the steps of : fabricating a microscale recess in at least a first ply; lidding the first ply with a second ply such that the recess or recesses in the ply or plies form a fluidly continuous channel (12) ,- urging curable material into this channel so as to substantially fill the channel with curable material, and in particular urging the material via an inlet (17) into a fluidly continuous channel until it emerges from an outlet (18) remote therefrom; curing the curable material in situ. A system for implementing the method and the bonded and/or sealed and/ or lined product of such method are also described.