Resin Substrate Fusing via Organic Solvent Treatment
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Solution Overview
Problem
In microfluidic chip manufacturing, thermal compression methods often result in deformation of substrate layers due to pressure, leading to incomplete joining and potential gaps at the joining interface, especially when electrodes are present, which can affect the integrity of the chip's functionality.
Innovation Solution
A fusing method that treats the joining surface of substrate layers with an organic solvent to reduce the crimping temperature below the glass transition temperature, followed by heating and crimping, and subsequent removal and pressurization to ensure complete joining, using a buffer material to prevent pressure concentration on convex surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If thermal compression method is used to join substrate layers, then joining strength is improved, but deformation of formed regions occurs due to pressure
Solution Approach 1:
The joining surface is treated with an organic solvent before thermal compression to reduce the required crimping temperature. This preliminary chemical treatment modifies the resin surface to facilitate bonding at lower temperatures, thereby preventing deformation of formed regions while maintaining joining strength
Solution Approach 2:
The crimping temperature is changed from above glass transition temperature to below glass transition temperature through organic solvent treatment. This parameter change allows thermal compression to proceed at lower temperatures that do not cause resin softening and subsequent deformation of formed regions
2Shape
If temperature is lowered during crimping to prevent deformation, then deformation is reduced, but softening of resin becomes insufficient and joining is not completed
Solution Approach 1:
Organic solvent treatment is performed before thermal compression to chemically modify the resin surface. This preliminary action enables the resin to soften and bond effectively at temperatures below the glass transition temperature, resolving the contradiction between low-temperature crimping and joining completeness
Solution Approach 2:
The chemical state of the resin surface is changed through organic solvent treatment, which lowers the effective softening temperature. This allows the resin to achieve adequate softening for complete joining at temperatures that prevent deformation of formed regions
3Strength
If crimping is performed at high temperature to ensure complete joining, then joining completeness is improved, but deformation of formed regions increases
Solution Approach 1:
The crimping temperature parameter is changed from high (above glass transition temperature) to low (below glass transition temperature) through organic solvent treatment. This enables complete joining to be achieved at lower temperatures that do not cause deformation of formed regions
Solution Approach 2:
Organic solvent treatment is applied before crimping to prepare the resin surface for low-temperature bonding. This preliminary chemical modification allows complete joining to occur at temperatures that prevent thermal deformation of temperature-sensitive formed regions
4Strength
If pressure is applied during crimping to ensure complete joining, then joining completeness is improved, but deformation of formed regions increases
Solution Approach 1:
Organic solvent treatment is performed before applying pressure during crimping. This preliminary treatment reduces the temperature required for softening, allowing pressure to be applied effectively without excessive thermal deformation of formed regions
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 prevents deformation and ensures complete joining of substrate layers, eliminating gaps and maintaining the integrity of the microfluidic chip's structure and functionality, even with minute level differences like electrodes.
Implementation Method 1
treating a joining surface of a substrate layer formed from a resin using an organic solvent having solubility with respect to the resin
Implementation Method 2
heating the treated substrate layer through heating at less than a glass transition temperature of the resin
Data Source
AI summary
Provided is a fusing method of a substrate layer including: treating a joining surface of a substrate layer formed from a resin using an organic solvent having solubility with respect to the resin; and heating the treated substrate layer at less than a glass transition temperature or a softening point temperature of the resin and crimping the heated substrate layer.