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 24 for “"thermoforming"”.
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Design and manufacturing of a benchtop thermoforming machine
… dimensions within .05" of the original part; thermoforming plastics that range between a 3" x 3" and 12" x 12" size; and having the ability to heat the plastic to at least 150°C in order to thermoform plastics such as polycarbonate. In addition, this machine had to be simple to manufacture and …
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Thermoforming three dimensional set and costume ornament from thermoplastic sheet
Thesis (M.A.)--Michigan State University. Dept. of Theatre, 1968
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Design of simple multi-use thermoforming molds for the beginner machinist designer
The aim of a class with Engineering Design points at MIT is to help the students learn how to put into practice different lessons and techniques in engineering a product. Beginner machinist are sometimes held back by the time consuming process of constructing proper housing in electronic dominant …
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Untersuchungen zur Dehnrheologie und Verarbeitbarkeit von Halbzeugen beim Thermoformen sowie Simulation und Optimierung der Umformphase
… and strain rate. The rheological properties of thermoforming sheets were correlated with the quality of thermoformed parts. The rheological data was additionally used to calibrate a viscoelastic material model. The material constants are used as input for Finite-Element-Analysis of the …
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The Design and Fabrication of a Punch and Die System for 2.008 Thermoformed Parts
… and the CNC milling, injection molding, and thermoforming in the Laboratory for Manufacturing and Productivity (LMP) were all optimized for the class, the punch and die system was one process that was more tedious than the rest. Punches, a die, and a calibration piece were designed, …
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Methods for increasing the thermal conductivity of ultra-high molecular weight polyethylene (UHMWPE)
… conducted to test the feasibility of stretched thermoforming of UHMW-polyethylene. Sheets of UHMWPE were stretched and tested for anisotropy in thermal conductivity. For samples with draw ratios of X 10, anisotropy in thermal conductivity was observed to increase. These results show potential …
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Mechanical design and prototyping of a neonatal incubator for areas with intermittent electrical grid power
… presented by the size constraints imposed by the thermoforming machines available in the Laboratory for Manufacturing and Productivity.
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An investigation of the effects of shearfree deformation and the role of miscibility on the structure and properties of in situ thermoplastic composites
… during stretching of the PEI/HX1000 blend. Thermoforming of In Situ Composites The use of in situ thermoplastic composites based on blends of a polyetherimide with an amorphous and a semicrystalline liquid crystalline polymer in the thermoforming process was explored in this part of the …
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Eliminating Plastic Waste by Transitioning Machine Shop to Produce Its Own 3D Printer Filament
… (LMP), students use injection-molding and thermoforming machines, and 3D printers for prototyping. All of these tools generate waste products; LMP throws out barrels of plastic every semester. To better align with MIT’s commitment to fighting climate change, LMP needs to cut down on its …
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Structural elements with mathematically defined surfaces for enhanced structural and acoustic performance
… manufacturing methods (e.g. stamping, rolling, thermoforming, etc.), resulting in a more effective structural element that does not require significant extra cost or weight. Initial analysis was performed using geometric modeling and finite element analysis. Experimental analysis involved both …
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Processing Behavior of Thermoplastics Reinforced with Melt Processable Glasses
… injection molding, compression molding, and thermoforming. Thermoplastic resins consisting of polyphenylene sulfide (PPS), polyetherimide (PEI) and polyetheretherketone (PEEK) were combined with phosphate glasses having glass transition temperatures (Tg) that ranged from 230-290°C to form …
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Finite element modelling the forming of components for portable electronic devices
… membranes. <br/><br/>The industrial practice of thermoforming is widely used for the large-scale manufacture of lightweight, thin-walled polymeric parts with the advantage of producing repeatable, complex products, paired with relatively cheap production costs. Desire to accurately predict the …
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Optimization of thermoplastic composite manufacturing with digital process intelligence
… experiments probing composites behavior during thermoforming; by monitoring parameters including pressure, temperature, cooling rate, and dimensions, the production process is characterized and controlled. A Design of Experiments (DOE) based on this platform identified temperature as the …
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Constitutive modeling of advanced thermoset composites with application to sheet forming processes
… graphite fibers. Composite sheet forming, or thermoforming, is a process where flat sheets of composite layups are heated and formed into desired part shapes. Due to the complex nature of composite material response, successful composite sheet forming processes (that avoid defects such as …
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Development and characterization of polyphthalaldehyde for transient applications
… of cPPA in both solvent/tape casting as well as thermoforming via hot press molding. A photoacid generator (PAG) was incorporated into cPPA films to generate acid within the film in response to exposure to UV light. Acid cleaved the polymer backbone of cPPA and resulted in solid state …
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DEVELOPMENT OF ON-SITE 3D-PRINTED AND BIO-SUSTAINABLE ORTHODONTIC ALIGNERS.
… to as aligners, are typically produced through thermoforming techniques and are manufactured sequentially. Each aligner generates small dento-skeletal movements based on biomechanical and biological principles, applying light forces that follow the principle of bone resorption and apposition. …
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Improving surface quality of SLA 3D printed parts via controlled dip-coating
… make low-volume molds for injection molding and thermoforming or to make unique fixtures. 3D printing via stereo lithographic apparatus (SLA) builds parts by curing photopolymer resins layer by layer. SLA 3D printing is often chosen for its relatively high quality surface finish. However, the …
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Manufacturing and Evaluation of Kenaf/Polypropylene Honeycomb Cores
… of flat composite sheets using an extruder, thermoforming the flat sheets into half-hexagonal corrugations and joining of the corrugations using an ultrasonic welder to form honeycomb cores. The effects of kenaf and maleated polypropylene proportions, fibre length, polypropylene melt flow …
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Self-reinforced polymer composites for energy absorbing applications
… and hybrid laminates were investigated by re-thermoforming the impacted laminates. Through the repair procedure, some layups retained their pristine stiffness and strength completely while others could be repaired up to 50%. <br/><br/>Finally, a road map was set for optimising self-reinforced …
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Manufacture of cellular solids using natural fibre reinforced composites
… and bending of the composite sheet during thermoforming process, a stress field is induced in the material, which upon extraction in that state, would result in either spring-forward or spring-back of the material causing dimensional instability, but by holding the part in that deformed …
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