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 57 for “"embossing"”.
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Hot micro-embossing of thermoplastic elastomers
… 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 embossing …
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Design of a liquid embossing machine
… to pattern thin films of liquid by liquid embossing. 10 designs were prototyped and evaluated according to pattern transfer, alignment, and ability to emboss large area. The final design utilizes a PDMS stamp cast such that it seals an air cavity, which is then pressurized to slightly bow …
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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 process …
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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 moved …
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Process control for micro embossing : initial variability study
The objective of this research is to study the dimensional variations in micro embossed parts. By measuring multiple parts produced with a fixed set of control inputs, it could be determined if the process is in statistical control, if the parts produced have any noticeable trends and if there are …
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Fabrication of polymer micro devices by ultrasonic hot embossing
In this thesis ultrasonic micro hot embossing is shown to be suitable for the fabrication of polymer micro structures and entire devices. Micro structures are generated in a couple of seconds. Similar as in hot embossing, a polymer film is softened by heating and a micro pattern is molded from a …
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ABAQUS simulation and optimization of PMMA hot embossing process
… 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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Modeling and control of a hot micro-embossing machine
… lithography, micro-injection molding, and micro-embossing. Micro-embossing shows great promise in terms of versatility in creating various structures, but its shortcoming is a relatively long cycle time. Therefore, it is imperative to find efficient ways of heating and cooling in addition to …
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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. Three …
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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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Process window and variation characterization of the micro embossing process
The micro embossing process on polymethylmethacrylate (PMMA) is demonstrated experimentally to be a useful process to produce micro fluidic and optical devices. Because this process is a one step thermoplastic deformation process, it is possible to reach high production rates and low cost in …
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Design of a fast cycle time hot micro-embossing machine
… most promising of these techniques is Hot Micro-Embossing (HME). In this process, a thermoplastic polymer workpiece is heated above its glass transition temperature and a micro-patterned die is forced into it. The polymer conforms to the workpiece and the features are replicated. Much of the …
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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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Modeling and controlling topographical nonuniformity in thermoplastic micro- and nano-embossing
The embossing of thermoplastic polymeric plates is valuable for manufacturing micro- and nanofluidic devices and diffractive optics. Meanwhile, the imprinting of sub-micrometer-thickness thermoplastic layers has emerged as a lithographic technique with exceptional resolution. Yet neither hot …
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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 of 6 …
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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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Liquid embossing : a technique for fabricating sub-micron electrical, mechanical and biological structures
Thesis (M.Eng. and S.B.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2001.
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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 of 6 …
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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 viability …
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Design of a micro-Functional Testing System for process characterization of a hot micro-embossing machine
… an alternate set of processes such as hot micro-embossing (HME) have received increased attention as manufacturing processes for high-volume polymer-based micro-fluidic production. An understanding of the equipment, process physics, control strategy, and metrology for part fabrication are …
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