Bonding as Part of Microfluidic Chip Manufacturing
Precision microchannels are only one part of a functional microfluidic device. After injection molding, bonding and assembly become critical steps in maintaining channel geometry, sealing integrity and overall device performance.
At Micromolds, bonding is integrated into our microfluidic injection molding workflow. By considering molding conditions, material properties and bonding requirements together, we help reduce process variability and support a more consistent transition to serial production.
Thermoplastic Microfluidic Bonding
Bonding injection-molded thermoplastic components requires careful consideration of polymer compatibility, surface properties, microchannel dimensions and sealing requirements.
Micromolds develops solvent-assisted bonding processes for suitable thermoplastic microfluidic components, with experience in PMMA-to-PMMA bonding.
Materials evaluated for microfluidic manufacturing and downstream bonding include PMMA, COC, COP and selected engineering thermoplastics. The appropriate bonding method depends on the specific material grade, device geometry and application requirements.
Our approach focuses on:
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Preserving microchannel dimensions during sealing
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Maintaining suitable bonding-interface quality
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Reducing risks of leakage and channel obstruction
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Establishing repeatable processing conditions
Cleanroom Bonding & Assembly
Microfluidic devices used in diagnostics and life sciences may contain features sensitive to particles, surface contamination and handling damage.
Micromolds operates an ISO Class 8 cleanroom and an ISO 13485-certified quality management system, supporting controlled manufacturing processes for demanding applications.
Integrating bonding and assembly into our manufacturing workflow allows us to coordinate component handling, surface preparation and sealing conditions with the preceding injection molding process.
Preserving Microchannel Integrity
Bonding can introduce mechanical, thermal or chemical effects that influence the geometry and performance of microfluidic channels.
Depending on the material and bonding process, excessive exposure or unsuitable process parameters may cause deformation, partial channel closure or changes in optical performance.
We consider these risks during process development, focusing on:
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Channel Geometry: Minimizing distortion of critical microfeatures.
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Bonding Interface: Maintaining suitable contact and sealing conditions.
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Optical Requirements: Considering the transparency and surface quality required by the device.
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Process Repeatability: Controlling relevant manufacturing parameters across production batches.
Microfluidic Bonding Capabilities
Microchannel Integrity
Sealing processes that preserve micro-scale channel geometry.
Thermoplastic Compatibility
Bonding solutions for COC, COP, PMMA and similar polymers.
Controlled Bonding Processes
Process parameters optimized to avoid deformation.
ISO 13485 Cleanroom Assembly
Bonding and assembly in controlled manufacturing environments.
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