Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 31 for “"Hot Embossing"”.
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Hot embossing of polymeric tubular micro-components
… have led to the development of a hot embossing process and corresponding machine for shaping polymeric micro-tubes. The targeted tubular micro-components are of an initial outer diameter of 1.6mm or below, and have reduced inner feature in the micron meter ranges. The proposed …
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Process characterization of a PMMA hot embossing system
… To create these microfluidics devices, the hot embossing process is commonly used. In order to characterize this process to enable cycle to cycle control, a small-scale system was developed, using a hot embossing machine, taping machine, and functional tester previously created. Parts were …
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ABAQUS simulation and optimization of PMMA hot embossing process
… the industry has led to increasing attention to hot embossing technology. The hot embossing technology has developed a lot for the past few decades and been proved to be capable to replicate microstructure with high efficiency and high accuracy. This thesis is going to establish a numerical hot …
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Rapid & controlled manufacturing of microfluidic devices using hot embossing
… the ability to quickly iterate on designs. Hot embossing has previously been demonstrated to have low capital costs and high flexibility. This work focuses on leveraging this flexibility to implement a closed-loop feedback controller within an automated hot embossing manufacturing cell. …
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Hot embossing as a method for rapid prototyping microfluidic devices
Hot embossing is a growing technology proven to be capable of reproducing micro-scale features on thermoplastics and can be an effective process for rapid prototyping microfluidic devices with high aspect ratio micro features. Advantages of this manufacturing process can include tooling …
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Development of a precision hot embossing machine with in-process sensing
… has proven difficult. This work focuses on hot embossing as a process suitable to produce these devices. In this work, a precision micro-embossing machine capable of maintaining precise setpoints in force and temperature input as well as displaying highly linear, repeatable motion and force …
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Design and measurement analysis of hot embossing system for high aspect ratio microfluidics
… HIV in patients. This work investigates hot embossing as a prototyping process for Daktari's microfluidic device. A hot embossing machine was designed and built for the purpose of prototyping a critical feature of their microfluidic network. The machine was designed for an embossing area …
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Development of a low-cost, rapid-cycle hot embossing system for microscale parts
Hot embossing is an effective technology for reproducing micro-scale features in polymeric materials, but large-scale adoption of this method is hindered by high capital costs and low cycle times relative to other technologies, and a general lack of manufacturing equipment. This work details a hot …
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Design and process optimization of a hot embossing machine for microfluidics with high aspect ratios
… HIV in patients. This work investigates hot embossing as a prototyping process for Daktari's microfluidic device. A hot embossing system was designed and built for the purpose of prototyping a critical feature of their microfluidic network. The machine was designed for an embossing area …
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3D cyclic olefin copolymer (COC) microfluidic chip fabrication using hot embossing method for cell culture platform
… production by the more commercially-viable hot embossing technique, and amenability to surface treatments. Here the fabrication process is described and the new systems are characterized. Surface wettability, bond strength between the system body and a covering plastic film, and cell …
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Design of a Mold Insert Alignment System for Double-Sided Hot Embossing of Microfluidic Devices Using Kinematic Constraints
The fabrication of microfluidic devices using hot embossing has increased in complexity. Many systems are multi component systems requiring that each be aligned properly with its mating components. Double-sided hot embossing is often used to produce stackable components for these assemblies. …
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A thermo-mechanical finite deformation theory of plasticity for amorphous polymers : application to micro-hot-embossing of poly(methyl methacrylate)
… with simulations of the micron-scale hot-embossing process for manufacture of microfluidic devices.
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Development of adhesive bonding and functional testing systems for in-process inspection of hot embossed microfluidic devices
… in producing them at low costs and high volumes. Hot embossing has been of interest lately as a low-cost, high quality, and flexible manufacturing method that is ideal for medium-volume production. This project focuses on the continued development of a tabletop microfactory that can be used to …
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An analysis of through-hole punching in PMMA with varied process parameters
… punching with a surface patterning during microembossing would greatly enhance the production of a variety of microfluidic devices. In support of that goal, a series of theoretical simulations and physical tests were performed to investigate the effect of clearance, shear speed and temperature …
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Hot micro-embossing of thermoplastic elastomers
… One promising fabrication technique for TPEs is hot micro-embossing (HME) in which a material is heated above its glass transition temperature and imprinted with a micromachined tool, replicating the negative of the tools features. Thus far, little research has been conducted on the topic of hot …
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Demolding of hot embossed polymer microstructures
… including casting, injection molding, and hot embossing. These techniques have in common the use of a mold to define the shape of functional features (fluidic channels), the separation of the part from the mold as a process step (demolding), and the intended re-use of the mold to produce …
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The replication of micron scale pillar arrays for medical ultrasound applications
… remain laboratory based. Viscous polymer (VP) embossing has been demonstrated as a route to smaller feature sizes and higher aspect ratios, but the process is limited by the availability of suitable moulds, which must be replicated to make the process cost effective. This thesis reviews the …
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A constitutive theory for the mechanical response of amorphous metals at high temperatures spanning the glass transition temperature : application to microscale thermoplastic forming of Zr₄₁.₂Ti₁₃.₈Cu₁₂.₅Ni₁₀Be₂₂.₅
… is demonstrated with simulations of micron-scale hot-embossing processes for the manufacture of micro-patterned surfaces.
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Double-sided microchannel patterning and through-hole production using injection molding of polypropylene
… to a research study previously conducted on hot embossed and through-hole punched parts. The walls of the injection molded microchannels were observed to be smoother than the hot embossed microchannels, but ridges were detected on the outmost channels of the injection molded parts which …
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Microbead-Based Biosensing in Microfluidic Devices
… microbead-based biosensing devices. A customized hot embossing technique was used to stamp an array of microwells in a thin plastic substrate where appropriately functionalized agarose microbeads were selectively placed within a conduit. Functionalized quantum dot nanoparticles were pumped through …
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