Glass Microstructure Sealing with Side Retainer Support
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Solution Overview
Problem
Glass microstructure sealing methods face challenges with slumping and deformation due to viscous flow under gravity and external loads, which complicates the achievement of robust and precise sealing in microreactor manufacturing, especially in glass-to-glass direct sealing processes.
Innovation Solution
The method involves using side retainer members to absorb the weight of an external load plate and a non-stick load bearing plate that adheres to glass at high temperatures, allowing for intimate contact and viscous compression without slumping, while maintaining optimal thermal conditions for surface tension sealing and rounding of channel sharp angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If glass-to-glass direct sealing is performed at high temperature to achieve robust bonding, then sealing strength is improved, but glass slumping and deformation occur due to viscous flow under gravity
Solution Approach 1:
The patent introduces a support structure (sacrificial mesh or spacer elements) positioned beneath the glass microstructure assembly during sealing. This support structure counteracts the gravitational force acting on the viscous glass, preventing slumping and deformation while allowing robust bonding to occur at high temperature. The support structure is temporarily held in place by side retainer members and is removed after sealing completes.
2Strength
If external load is applied to force contact between glass sheets for sealing, then bonding is improved, but microchannel deformation accelerates due to increased viscous flow
Solution Approach 1:
The support structure (sacrificial mesh or spacer elements) acts as a counterbalance to the external sealing load, distributing the force uniformly across the glass assembly and preventing localized deformation of microchannels. This allows sufficient contact pressure for bonding while maintaining dimensional precision.
Solution Approach 2:
The invention introduces side retainer members that constrain the glass assembly in the lateral dimension, preventing horizontal deformation and channel distortion while allowing vertical compression for bonding. This multi-dimensional constraint system enables load application without compromising microchannel geometry.
3Reliability
If frit-based sealing is used to achieve robust sealing at high viscosity, then sealing reliability is improved, but process complexity increases due to additional preparation and deposition steps
Solution Approach 1:
The patent extracts and eliminates the frit material from the sealing process, using direct glass-to-glass bonding instead. This removes the complex steps of frit preparation, uniform deposition, and sintering, while achieving equivalent or superior sealing reliability through controlled thermal processing and mechanical support.
Solution Approach 2:
The support structure (sacrificial mesh or spacer elements) serves as an intermediary element that enables direct glass-to-glass bonding by providing mechanical support during the sealing process, replacing the functional role previously played by frit material without requiring its complex application procedures.
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 robust sealing of glass microstructures with minimized deformation, maintaining the geometry and mechanical strength of microchannels, and eliminates the need for complex frit-based processes, improving the efficiency and reliability of microreactor production.
Implementation Method 1
heating the glass microstructure and the top plate to a glass sealing temperature, the glass sealing temperature being a temperature sufficient to make the glass viscous
Implementation Method 2
the temperature and the sealing time have to be chosen carefully in order to permit the surface tension of glass to fuse the parts together
Implementation Method 3
the load bearing top plate vertically compresses the viscous glass in the glass microstructure assembly until the load bearing top plate contacts and is supported by the side retainer members
Implementation Method 4
the lower surface of the top plate maintains adhesion to the upper surface of the top glass layer at the glass sealing temperature
Data Source
AI summary
Embodiments of methods for sealing a glass microstructure assembly comprise providing one or more side retainer members on a base plate adjacent the glass microstructure assembly, the side retainer members having a height less than an uncompressed height defined by the glass microstructure assembly. The methods also comprise compressing the glass microstructure assembly via a load bearing top plate in intimate contact with the top glass layer while heating the glass microstructure assembly and the top plate to a glass sealing temperature, the glass sealing temperature being a temperature sufficient to make glass viscous, wherein the glass microstructure assembly is compressed until the load bearing top plate contacts the side retainer members, and wherein the lower surface of the top plate maintains adhesion to the upper surface of the top glass layer at the glass sealing temperature while the load bearing plate is supported by the side retainer members.