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Dissertations / Theses on the topic 'Extrusion'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Santoro, Gianmarco. "Mixed alloy chip extrusion." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2018.

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The aim of the investigation is to characterize the behaviour of billets composed of different aluminium alloys chips, shape and size. The billets were processed by plastic deformation in order to obtain useful parameters to make final products with good aesthetic-structural characteristics. This is made possible by direct recycle of chips with plastic deformation processes, in specific with a chip-based hot extrusion process. This technique is very interesting at an industrial level where the chips coming from various aluminium alloy machining procedures are accumulated together. The classic

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2

Lüssi, Cécile. "Signature-based extrusion detection." Zürich : Eidgenössische Technische Hochschule Zürich, Institut für Technische Informatik und Kommunikationsnetze, 2008. http://e-collection.ethbib.ethz.ch/show?type=dipl&nr=411.

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3

Bryner, Thomas K. "The composite extrusion process." Ohio : Ohio University, 1989. http://www.ohiolink.edu/etd/view.cgi?ohiou1182284434.

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4

Peck, Martin Clive. "Roller extrusion of pastes." Thesis, University of Cambridge, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.417961.

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5

Caldwell, L. "Modelling of polymer extrusion." Thesis, Queen's University Belfast, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.419561.

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6

Gerginov, Branimir Borissov. "Investigations into continuous extrusion." Thesis, Imperial College London, 1989. http://hdl.handle.net/10044/1/47445.

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7

Beaumel, Christian. "Extrusion des pâtes d'argiles." Grenoble INPG, 1998. http://www.theses.fr/1998INPG0056.

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L'industrie de la terre cuite valorise les materiaux de la terre en extrudant des pates d'argiles. Le but de cette etude est la maitrise de la mise en forme a vitesse elevee de ces pates et des defauts d'extrusion. La caracterisation des proprietes physiques et rheologiques des pates, notamment dans des conditions non consolidees et non drainees, les fait apparaitre comme des materiaux plastiques heterogenes. Les proprietes d'interface des pates sont caracterisees grace a un tribometre concu pour l'etude des frottements a vitesse elevee. Nous proposons une loi de frottement suggerant un coupla

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8

Borghi, Nicolas. "Nanotubes membranaires : extrusion hydrodynamique." Paris 6, 2006. http://www.theses.fr/2006PA066556.

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9

Almeida, Rosemeire dos Santos. "Influência da velocidade de rotação no processo de extrusão do polipropileno virgem e reciclado." [s.n.], 2010. http://repositorio.unicamp.br/jspui/handle/REPOSIP/266923.

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Orientador: João Sinézio de Carvalho Campos<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Química<br>Made available in DSpace on 2018-08-17T10:17:41Z (GMT). No. of bitstreams: 1 Almeida_RosemeiredosSantos_M.pdf: 1496479 bytes, checksum: b8bf05066c4483752cebde2f006e95c6 (MD5) Previous issue date: 2010<br>Resumo: E bem conhecido o amplo uso de materiais poliméricos e o proporcional impacto que eles causam quando são descartados no meio ambiente, especialmente os "commodities" como Polipropileno (PP) e Polietileno (PE). Isso tem preocupado os cientistas,

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10

Samy, Sekhar. "Multiple extrusion of superconducting wires." Ohio : Ohio University, 1990. http://www.ohiolink.edu/etd/view.cgi?ohiou1183473010.

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11

Hurysz, Kevin Michael. "Paste mechanics for fine extrusion." Diss., Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/19424.

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12

Flitta, Isaac. "Simulation of aluminium extrusion process." Thesis, Bournemouth University, 2004. http://eprints.bournemouth.ac.uk/314/.

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The aim of this thesis is to model the extrusion process conditions for some aluminium alloys using Finite Element Modelling (FEM) program. All the simulations were performed with the implicit finite element code FORGE20 (2-D) and FORGE3® (3-D). In this work only the alloys AA2024, AA2014, Al-1 %Cu and AA6063 where experimental work is available were considered. The FORGE2® program was used to investigate and select an appropriate flow stress constitutive equation to describe the material behaviour to model the process conditions. The extrusion pressure and the temperature rise were predicted

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13

Sander, R. "Modelling of slit die extrusion." Thesis, Swansea University, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.638761.

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The present work is concerned with the investigation of the slit die extrusion of molten polymers, and a systematic strategy is developed for the modelling of its major aspects. The objective is to provide a fundamental understanding of the flow phenomena within such a die, coupled with thermal and mechanical interaction of melt and die body, and to provide user friendly software for analysis and design. Isothermal, non-Newtonian flow in the large aspect ratio channels of such dies is modelled using a Hele-Shaw formulation. The pressure field in the die causes a change of the flow channel dime

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14

Crook, S. J. "The cold extrusion of chocolate." Thesis, University of Cambridge, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.598171.

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The objective of this thesis was to gain an understanding of the cold extrusion of chocolate, both physically and mathematically. This was achieved by quantifying the effect of pertinent process variables upon the pressure difference across a die as a chocolate flowed through it. Changes in the chocolate's cross-sectional area were found to have a large effect upon the extrusion pressure, whereas increases in its flowrate did not. It was also observed that the pressure on cessation of extrusion remained at a finite value. In addition, the boundary condition during cold extrusion was directly v

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15

Botten, Aleksandra Joanna. "Modelling single screw extrusion processes." Thesis, University of Birmingham, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.396429.

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16

Macauley, Nicola Jayne. "Extrusion and thermoforming of polypropylenes." Thesis, Queen's University Belfast, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.337017.

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17

Namutebi, Agnes Ssekaalo. "Extrusion processing of sweet potato." Thesis, University of Nottingham, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.247561.

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18

Jones, Sylvia Anna. "Extrusion cooking of confectionery systems." Thesis, Cranfield University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.310905.

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19

Amarasinghe, Angodage Don Upul Shantha. "Interpretation of paste extrusion data." Thesis, University of Cambridge, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.285008.

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20

Domanti, Annette Therese Jocelyn. "Surface fracture in paste extrusion." Thesis, University of Cambridge, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.242554.

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21

Parson, N. C. "Extrusion of aluminium-lithium alloys." Thesis, Imperial College London, 1985. http://hdl.handle.net/10044/1/37814.

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22

Depenbusch, Brandon E. "Extrusion processing of feedlot diets." Diss., Kansas State University, 2009. http://hdl.handle.net/2097/4622.

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Doctor of Philosophy<br>Department of Animal Sciences and Industry<br>James S. Drouillard<br>A series of studies were conducted to evaluate extrusion processing of finishing diets on growth performance, carcass characteristics, and meat quality attributes of feedlot cattle. Extruded diets were processed in a 24:1 (length/diameter) corotating, fully intermeshing twinscrew extruder (model BCTG-62, Bühler AG CH-9240, Uzwil, Switzerland). In Experiment 1, extrusion processing of corn based diets decreased dry matter intake (DMI) and improved gain efficiency (G:F) by 15% compared to heifers fe

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23

Horrobin, Daniel Joseph. "Theoretical aspects of paste extrusion." Thesis, University of Cambridge, 1999. https://www.repository.cam.ac.uk/handle/1810/283825.

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24

Haberbusch, Diane. "Viscosity Regulation In Polymer Extrusion." Cleveland State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=csu1386782032.

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25

Zhao, Zhiyang. "Reactive Extrusion Synthesis of Ionomers." University of Akron / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=akron1408030685.

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26

Alevizos, Konstantinos. "Tube extrusion of hexagonal metals." Thesis, Imperial College London, 2010. http://hdl.handle.net/10044/1/6049.

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Zr-2.5 wt % Nb (Zr-2.5Nb) is the main alloy used in the pressure tubes of CANDU nuclear reactors, which are manufactured by hot extrusion. Pressure tubes are subjected to high irradiation fields and corrosion, in addition to the applied stress at operating temperatures of around 330°C, which leads to irradiation creep that is often life-limiting; re-tubing the reactors, is a source of significant through-life cost of the reactor system. However, significant variability in performance is observed between tubes and stations, which is felt to be due to variability in the fabrication and operation

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27

Westermann, Kira. "Extrusion von physikalisch geschäumten Kautschukprofilen /." Aachen : Mainz, 2009. http://d-nb.info/995461023/04.

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28

O'Connell, Sean Patrick. "Hot-melt Extrusion Through Syringes." Diss., The University of Arizona, 2014. http://hdl.handle.net/10150/338734.

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The use of solid dispersions to formulate poorly water soluble drugs is a growing field in the pharmaceutical sciences. Hot-melt extrusion is a common method for producing dispersions. However, bench-top extruders require large amounts of powder to run and are inappropriate for early formulation screens. Plastic and glass syringes are readily available in most laboratories. 250 mg of drug-polymer blend is placed in a plastic syringe body that has the tip covered with a bent needle. The syringe is heated for 5 minutes and the extrudate is pushed through the syringe. Extrudates are characterize

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29

Coleman, Brandon F. "High Moisture Extrusion of Oatmeal." DigitalCommons@CalPoly, 2015. https://digitalcommons.calpoly.edu/theses/1390.

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Oats are considered to be a highly nutritious breakfast food available to consumers. Heightened consumer interest in functional food products and advances in human nutrition have led to increased levels of interest in the development of new oat based products (Webster and Wood 2011). Developments in technology have led to manufacturing of instant oatmeal, making the product more convenient to consumers. Low moisture extrusion processing is one of the most widely used methods to produce ready to eat breakfast cereals; however, there has been little research carried out to determine if high mois

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30

Goetz, Robert L. "An analysis of canned extrusion using analytical methods and the experimental extrusion of cast IN100." Ohio : Ohio University, 1990. http://www.ohiolink.edu/etd/view.cgi?ohiou1183490628.

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31

Narayan, Sujatha. "Post-fiber extrusion solid-state polymerization of nylon 46." Thesis, Georgia Institute of Technology, 1994. http://hdl.handle.net/1853/8228.

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32

Chen, Tao. "Recycling carpet waste by reactive extrusion." Thesis, Georgia Institute of Technology, 1996. http://hdl.handle.net/1853/8485.

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33

Marques, Marcelo Rodrigues. "Ação hipocolesterolêmica de hidrolisados de feijões caupi (Vigna unguiculata L. Walp)." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/6/6138/tde-09102013-152334/.

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Introdução - Devido ao perfil de mortalidade e de danos patológicos associados, as doenças cardiovasculares são consideradas um sério problema de saúde pública. Níveis de colesterol plasmático elevados fazem parte dos fatores de risco mais importantes para o desenvolvimento dessas doenças. Pesquisas recentes demostraram que a proteína do feijão caupi promove a redução dos níveis de colesterol em hamsters e em seres humanos, possivelmente pela ação de peptídeos bioativos advindos da dieta. Entretanto, a via pela qual o colesterol é inibido por esses peptídeos, assim como os efeitos do processam

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34

Soto, Yatsen Jepthe Maldonado. "Adequação de formulações para a produção de placas de fibrocimento por extrusão." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/3/3146/tde-04072012-180623/.

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Este trabalho propõe contribuir no desenvolvimento do processo de extrusão para a produção de compósitos cimentícios, mediante metodologia que possibilite a obtenção de formulações extrudáveis utilizando cimento Portland de alta resistência inicial, sílica ativa, calcário, polpa de celulose de eucalipto, fibras de polipropileno e aditivos. Para isso, foram caracterizadas as matérias-primas como subsidio para as discussões. O efeito dos diferentes componentes da formulação no comportamento reológico da mistura foi avaliado utilizando reômetro extrusor. As propriedades físicas e mecânic

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35

Kite, Matthew J. S. "Computational modelling of clay pipe extrusion." Thesis, Available from the University of Aberdeen Library and Historic Collections Digital Resources. Online version available for University members only until June 9, 2014, 2009. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?application=DIGITOOL-3&owner=resourcediscovery&custom_att_2=simple_viewer&pid=25966.

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36

Boss, Brienne. "Blue Cornmeal Extrusion and Anthocyanin Stability." Fogler Library, University of Maine, 2011. http://www.library.umaine.edu/theses/pdf/BossB2011.pdf.

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37

Perez, Gonzalez Alejandro Jose. "Specialty sorghums in direct-expansion extrusion." Texas A&M University, 2005. http://hdl.handle.net/1969.1/4872.

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Whole-grain, high-fiber, or decorticated extrudates of excellent properties were made from white (nonwaxy, heterowaxy, waxy) sorghums or brown tannin-sorghums. Intact grains or prepared raw materials (cracked, cracked and sifted, decorticated) were extruded in a high-temperature, short-time (HTST) extruder. Waxy extrudates expanded less and were softer than those from nonwaxy or heterowaxy sorghums. Waxy extrudates had bigger air cells and thicker cell walls. Low moisture used in this type of extrusion and its interaction with the different amylose contents were the causes of the differences.

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38

Grubbström, Göran. "Reactive extrusion of wood-thermoplastic composites." Licentiate thesis, Luleå tekniska universitet, Materialvetenskap, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-16932.

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The interest in Wood-thermoplastic composites (WPCs) has increased during the last decades. WPCs are commonly used as building material for decking and railing because of its low need of maintenance. Wood is a renewable resource of good mechanical properties and this make wood fibers interesting to use as reinforcement in a thermoplastic composite. A drawback with this type of composite is the poor long-term mechanical properties which limit its field of applications. The objective of this work was to optimize the process and understand structure-property relations of silane-crosslinked WPCs p

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39

Robinson, Jeremy St John. "Extrusion of rapidly solidified powder compacts." Thesis, Imperial College London, 1987. http://hdl.handle.net/10044/1/46338.

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40

Wang, Xiao Chuan. "Branching of polypropylene through reactive extrusion." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq21396.pdf.

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41

Verhoeven, Vincent Wilhelmus Andreas. "The reactive extrusion of thermoplastic polyurethane." [S.l. : [Groningen : s.n.] ; University Library Groningen] [Host], 2006. http://irs.ub.rug.nl/ppn/292374224.

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42

Hansson, Sofia. "Simulation of stainless steel tube extrusion." Licentiate thesis, Luleå : Luleå University of Technology, 2006. http://epubl.ltu.se/1402-1757/2006/13/index.html.

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43

Desai, Dipen. "Solid-state plasticizers for melt extrusion /." View online ; access limited to URI, 2007. http://0-digitalcommons.uri.edu.helin.uri.edu/dissertations/AAI3276980.

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44

Popescu, Catalin Nicolae. "Modeling and control of extrusion coating." Diss., Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/13700.

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45

Fichtali, Jaouad. "Production of caseins using extrusion technology." Thesis, McGill University, 1990. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=74580.

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Preliminary experiments indicated that an acid casein co-precipitate could be produced by extrusion from skim milk powder (SMP). In assessing the problems encountered, experiments were designed to model and optimize the coagulation/washing process using response surface methodology (RSM), to minimize residual whey components and losses of fines. This study yielded useful information relative to improving our understanding of the coagulation mechanism and the most important variables affecting the process. In addition, RSM allowed multiresponse optimization of acid casein production using uniqu

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46

Samaras, V. "The calibration process in thermoplastics extrusion." Thesis, Swansea University, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.638758.

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In the first part of this research work a new version of the cooling simulation software was constructed by changing the old convection module, which used the commercial software package POLYFLOW, to a new version using an alternative code developed in the Centre for Polymer Processing at the University of Wales Swansea, called Fantazt. This change introduced a large number of modifications in order for the new convection module to work in harmony with the rest of the program. Also many improvements have taken place in the new version, with respect to the computational time and the functionali

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47

Oates, Christopher G. "Soya/alginate interactions in extrusion cooking." Thesis, University of Nottingham, 1988. http://eprints.nottingham.ac.uk/11161/.

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Previous work has shown that following the inclusion of alginate high in mannuronic acid there is a reduction in the viscosity of soya melt during extrusion, this work attempts to identify the mechanism for this effect. The effect of water content and hydrocolloid inclusion on the denaturation behaviour and water binding properties of soya protein has been investigated, mainly by the use of differential scanning calorimetry. Of a range of parameters investigated, transition onset temperature and enthalpy, change in specific heat function and coopertivity of the transition all show a dependence

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48

Senouci, A. "Rheology and modelling in food extrusion." Thesis, University of East Anglia, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.235484.

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49

Edmondson, Michael James. "Metals in zeolites : inclusion and extrusion." Thesis, University of Birmingham, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.395736.

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50

Farzad, A. "Rationalization of tool design in extrusion." Thesis, University of Leeds, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.234073.

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