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 81 for “"twin-screw"”.
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Clearance management in twin screw compressors
Although the performance of twin screw compressors is heavily dependent on the rotor clearances within them, chamber models, used as design aids, allow for the specification of their magnitude and distribution but do not account for how these may vary during operation, as a result of internal …
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Development of a multi-purpose twin-screw extruder
… World countries in which mainly single process twin-screw extruders are used. This leaves a void for the development for a multi-purpose twin-screw extruder. This will enable companies to manufacture a greater diversity of products with one machine, not only in South Africa, but in the rest of …
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Texturization of soy protein via twin-screw extrusion
… extenders. In this study, a Werner & Pfleiderer twin-screw extruder Model ZSK-30 was used to texturize defatted soy flour and soy protein concentrate. A cooled sheeting die was designed to enhance the texture integrity of the finished product. Rheological properties of extrudates were measured by …
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Regime map development for co-rotating twin screw granulation
… thesis focused on one of the main equipments – twin screw extruder and attempted to develop the regime maps and the granulation hypothesis for twin screw granulation. In order to compare the mechanism with high-shear granulation that has been studied [1], the same materials were chosen (MCC …
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Review of energy harvesting methods for twin screw extruders
… wireless sensor networks for system monitoring. Twin screw extruders are a type of extrusion processing machinery and could benefit from a condition monitoring system. Implementing a condition monitoring system for a twin screw extruder can prevent wasting materials, producing unusable products, …
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Novel Application of Twin Screw Extruder on Production of Diverse Formulations
Twin-screw extruder has attracted considerable attention in the pharmaceutical industry as an alternative processing instrument due to its advantages compared to other conventional equipment, such as economical processing, small footprint, reduced in-process times, solvent-free and continuous …
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A detailed, stochastic population balance model for twin-screw wet granulation
… compartmental population balance model for twin-screw granulation using the stochastic weighted particle method. A number of new particle mechanisms are introduced and existing mechanisms augmented including immersion nucleation, coagulation, breakage, consolidation, liquid penetration, …
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Flow and mixing studies in a co-rotating intermeshing twin screw extruder
… in the process of polymer melt extrusion by twin screw extruder is limited by their geometrical complexity and the interactions of the process parameters. Mixing and flow in a 100mm diameter, trapezoidal channeled, intermeshing co-rotating twin-screw extruder have been characterised by …
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Design and development of polymeric nanoparticles by continuous manufacture using twin screw extrusion
… amorphous solid dispersion (ASD) using twin-screw extrusion (TSE) for three drugs: indomethacin (IND), naproxen (NPX) and ibuprofen (IBU) with Eudragit® EPO (EPO). The design spaces were predicted through Flory-Huggins (FH) based theory, and the selected ASDs were manufactured using …
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Experimental Modeling of Twin-Screw Extrusion Processes to Predict Properties of Extruded Composites
Twin-screw extrusion is used to compound fillers into a polymer matrix in order to improve the properties of the final product. The resultant properties of the composite are determined by the operating conditions used during extrusion processing. Changes in the operating conditions affect the …
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Characterization of starch-additive interactions in starch-based systems during twin-screw extrusion
… feed composition on the overall performance of a twin-screw extruder and the final product characteristics were investigated. Addition of ingredients such as silicon dioxide and oil to a starch-based feed not only had an effect on the rheological behavior of the dough during extrusion, but also a …
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Design and Construction of a High Pressure System for Evaluating Multiphase Twin-Screw Pumps
Twin-screw pumps are currently sold by manufacturers without adequate data predicting the pump behavior when pumping multiphase mixtures. In light of the fact that pump behavior is known to change significantly under these conditions, a new closed-loop test facility has been designed and …
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Twin screw extrusion pre-treatment of wheat straw for biofuel and lignin biorefinery applications
… processes in the production of biofuel. Twin screw extrusion is a highly feasible pretreatment method and has been received great interest in the recent year pre-treatment studies. Twin screw extrusion is a continuous process, where the biomass feedstock can be subjected to a combination …
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Characterization of dispersive and distributive mixing in a co-rotating twin-screw compounding extruder
A new design of closely intermeshing co-rotating twin-screw compounding extruder, developed at Brunel University, has been utilized in the development of quantitative techniques for characterization of dispersive and distributive mixing in thermoplastics materials prepared by extrusion compounding. …
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The production of a lyotropic liquid crystal coated powder precursor through twin screw extrusion.
The twin screw extrusion technique has been explored to produce lyotropic liquid crystal coated powder precursor by exploiting Pluronic F127 thermoreversible gelation property to get powder precursor without granular aggregates or with less compacted granular aggregates. The highly soluble …
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Continuous Devulcanization of Ground Tire Rubber of Different Particle Sizes Using an Ultrasonic Twin-Screw Extruder
… was conducted using an ultrasonic co-rotating twin-screw extruder at ultrasonic amplitudes from 5 to 13 µm and a frequency of 40 kHz. Ultrasonic power consumption and die pressure during devulcanization, curing behavior of devulcanized rubber, gel fraction and rheological properties of …
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A study of organic Rankine cycle systems with the expansion process performed by twin screw machines
… an Organic Rankine cycle (ORC) system using a twin screw expander to generate the power output, with HFC-245fa, as the working fluid. A software package (Power Plant Performance Prediction Program), simulating ORC system performance was therefore prepared for this purpose. Major components were …
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On-line rheology, flow simulation and system-based modelling of twin-screw extrusion processing of corn meal
… corn meal formulations was carried out using a twin screw extruder as a rheometer. On-line rheometrical techniques used for rheological characterization of non-food polymers were modified to make them adaptable to food materials extruded in a twin-screw extruder. The experimentally obtained …
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Cellulose Nano Fibers Infused Polylactic Acid Using the Process of Twin Screw Melt Extrusion for 3d Printing Applications
In this thesis, cellulose nanofiber (CNF) reinforced polylactic acid (PLA) filaments were produced for 3D printing applications using melt extrusion. The use of CNF reinforcement has the potential to improve the mechanical properties of PLA, making it a more suitable material for various 3D …
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