Дисертації з теми "Screw extruder"
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Djuric, Dejan. "Continuous granulation with a twin-screw Extruder." Göttingen Cuvillier, 2008. http://d-nb.info/989861163/04.
Повний текст джерелаKulshreshtha, Manoj Kumar. "Modelling and control of a twin screw food extruder." Thesis, University of Reading, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.302937.
Повний текст джерелаKalali, Kiana. "Quantitative parameters to evaluate mixing in a single screw extruder." Thesis, McGill University, 2011. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=103764.
Повний текст джерелаLes phénomènes de mélange dans les extrudeuses monovis ont été étudiés en détail depuis de nombreuses années. Le défi principal est le choix des éléments de mélange les mieux appropriés pour une tâche de mélange donnée. A ce jour, les fabricants d'équipements de mise en oeuvre des matières plastiques s'appuient fortement sur des données expérimentales et leur expérience pour opérer ce choix. Dans ce travail, notre objectif est de développer des critères d'évaluation quantitatifs pour différents éléments de mélange dans les extrudeuses monovis. A cet effet, nous comparons l'effat de mélange dans trois éléments de mélange différents (à savoir une zone de vis à filet simple, une zone de mélange à filet barrière de type Maddock, et une troisième zone à picots de type Saxton) en utilisant la distribution du temps de séjour et l'analyse d'images. Pour la distribution du temps de séjour, une matière de traçage est injectée dans la machine, et sa concentration dans l'extrudat déterminée par la pesée du résidu solide des échantillons. Pour l'évaluation optique du mélange, des images de copeaux d'échantillons étaient analysées au moyen d'un logiciel Matlab. Donc, les différents éléments de mélange sont caractérisés, pour les matières utilisées dans cettte étude (des polyoléfines), par la distribution du temps de séjour et la qualité de mélange obtenue par analyse d'image. Mis ensemble, nos résultats confirment que la qualité de mélange obtenue est directement liée à la distribution du temps de séjour; le meilleur résultat est obtenu avec le mélangeur de type Saxton. Les deux paramètres peuvent être utilisés non seulement pour l'évaluation, mais aussi la prédiction de l'effet de mélange dans d'autres conditions et configurations.
Bravo, Victor. "Finite element simulation of flow in twin screw extruder mixing elements." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0005/NQ42727.pdf.
Повний текст джерелаVan, Niekerk Werner. "Development of a multi-purpose twin-screw extruder / Werner van Niekerk." Thesis, North-West University, 2009. http://hdl.handle.net/10394/5088.
Повний текст джерелаRodriguez, Veloz Oscar Alberto. "The development of laminar morphology in a co-rotating twin screw extruder." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0026/MQ50656.pdf.
Повний текст джерелаKnott, Brian. "Effective control of a low-cost twin-screw food extruder / Brian Knott." Thesis, North-West University, 2006. http://hdl.handle.net/10394/1640.
Повний текст джерелаSingh, D. P. "Flow and mixing studies in a co-rotating intermeshing twin screw extruder." Thesis, Brunel University, 1988. http://bura.brunel.ac.uk/handle/2438/5548.
Повний текст джерелаChen, Dong. "An on-line measurement of residence time distribution in a twin-screw extruder /." Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=61235.
Повний текст джерелаThe RTD of a ZSK-30 twin-screw extruder was measured with and without an in-line rheometer installed. Various operating conditions were used to examine their effects on the RTD curve. It was found that the mean residence time of the system decreased linearly with screw speed and exponentially with the feed rate. The temperature effect was minuscule. The in-line rheometer increased the mean residence time of the system by 80%.
Mastio, Michael Joseph Becker Bryan R. "Material wear and failure mode analysis of breakfast cereal extruder and screw elements." Diss., UMK access, 2005.
Знайти повний текст джерела"A dissertation in engineering and mathematics." Advisor: Bryan R. Becker. Typescript. Vita. Title from "catalog record" of the print edition Description based on contents viewed June 26, 2006. Includes bibliographical references (leaves 133-134). Online version of the print edition.
Khan, Maazullah. "Modeling of extrusion cooking of full-fat soybean in a single screw extruder /." free to MU campus, to others for purchase, 1996. http://wwwlib.umi.com/cr/mo/fullcit?p9821347.
Повний текст джерелаMoysey, Paul A. Thompson Michael Richard. "Discrete element simulation of the solids conveying zone of a single-screw extruder." *McMaster only, 2007.
Знайти повний текст джерелаBruce, David P. "Flow field analysis of some mixing and conveying screw element regions, within a closely intermeshing, co-rotating twin-screw extruder." Thesis, Aston University, 1997. http://publications.aston.ac.uk/9602/.
Повний текст джерелаBan, Kyunha. "Mechanism and Significance of Slip and New Mixing Elements During Flow in Modular Intermeshing Co-Rotating Twin Screw Extruders." University of Akron / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=akron1218132059.
Повний текст джерелаEss, J. W. "Characterization of dispersive and distributive mixing in a co-rotating twin-screw compounding extruder." Thesis, Brunel University, 1989. http://bura.brunel.ac.uk/handle/2438/5239.
Повний текст джерелаStasiek, Andrzej. "Badania procesu współbieżnego dwuślimakowego wytłaczania modyfikowanego polipropylenu przy zmiennej geometrii ślimaków." Rozprawa doktorska, Uniwersytet Technologiczno-Przyrodniczy w Bydgoszczy, 2015. http://dlibra.utp.edu.pl/Content/886.
Повний текст джерелаOosthuizen, Jan Stephanus. "Development of a twin screw extruder with an integrated cooling roller system / Jan Stephanus Oosthuizen." Thesis, North-West University, 2011. http://hdl.handle.net/10394/8070.
Повний текст джерелаThesis (MIng (Mechanical Engineering))--North-West University, Potchefstroom Campus, 2012.
Elsey, Justin Rae. "Dynamic Modelling, Measurement and Control of Co-rotating Twin-Screw Extruders." University of Sydney. Department of Chemical Engineering, 2003. http://hdl.handle.net/2123/687.
Повний текст джерелаJordaan, Corrie. "The development of a control system for gravimetric feeding of a twin screw extruder / Jordaan C." Thesis, North-West University, 2012. http://hdl.handle.net/10394/8183.
Повний текст джерелаThesis (MIng (Mechanical Engineering))--North-West University, Potchefstroom Campus, 2012.
Liang, Tian. "Continuous Devulcanization of Ground Tire Rubber of Different Particle Sizes Using an Ultrasonic Twin-Screw Extruder." University of Akron / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=akron1366063285.
Повний текст джерелаHojabr, Sassan. "Mathematical modeling and process investigation of melt grafting reactions in an intermeshing co-rotating twin screw extruder." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0004/NQ27829.pdf.
Повний текст джерелаMichalska-Pożoga, Iwona. "Influence of the disc mechanism plasticization in screw - disk extruder on mechanical proprieties material : PhD thesis summary." Rozprawa doktorska, [s.n.], 2006. http://dlibra.tu.koszalin.pl/Content/1201.
Повний текст джерелаBumm, Sug Hun. "Mixing Studies and Simulation of Compounding Chopped Fiber and Silica Filler into Thermoplastics in a Modular Co-Rotating Twin Screw Extruder." University of Akron / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=akron1271956146.
Повний текст джерелаКумар, Джаяш. "Лінія для виробництва труб з модернізацією екструдера". Bachelor's thesis, КПІ ім. Ігоря Сікорського, 2020. https://ela.kpi.ua/handle/123456789/34559.
Повний текст джерелаThe work consists of an introduction and three sections. The total volume of 85pages of main text, 3 applications. The aim is modernization of the screw of the production of polyvinyl chloride pipes. Designed line will allow to produce polyvinyl chloride pipes, which have a significant number of advantages compared with the pipes of iron and steel. The screw extruder is designed in the paper. Achieved required parametric calculations and strength calculations. Results of diploma project have been considered at chair СPSE seminar
Imhoff, Andreas. "Dreidimensionale Beschreibung der Vorgänge in einem Einschneckenplastifizierextruder = Three-dimensional description of the process in a single screw plasticating extruder /." Aachen : Mainz, 2004. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=013369621&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.
Повний текст джерелаGatt, Etienne. "Etude de la déconstruction de résidus agricoles lignocellulosiques par extrusion biocatalytique." Thesis, Toulouse, INPT, 2019. http://www.theses.fr/2019INPT0006/document.
Повний текст джерелаBiocatalytic extrusion, also named bioextrusion, is a reactive extrusion technique using enzymes as catalysts. Bioextrusion is considered as a link between the previous physico-chemical pretreatment (like alkaline extrusion) and the subsequent enzymatic hydrolysis in batch conditions. The extrusion allows a continuous, flexible and versatile process for high consistency media, easily transferable to the industrial level. However, complexity of both lignocellulosic biomass and lignocellulolytic enzymes and their interactions during the extrusion process are underlined by the literature. Numerous response surface methodology experiments with starchy biomass indicate that bioextrusion efficiency is mainly influenced by substrate and enzymes loading. Enzymatic activity during the bioextrusion process of lignocellulosic biomass is confirmed by the experiments despite the mechanical constraints and the limited residence time. During bioextrusion, best holocellulosic fraction hydrolysis results were obtained with high substrate and enzymes loadings. Significant modifications of the solid fraction like particule size reduction, visual deconstruction of the biomass structure, increased sensibility to thermal decomposition and the evolution of the surface exposure of crystalline and amorphous cellulose were observed. Enzymatic hydrolysis of the bioextrdates is prolonged in batch conditions. Clear improvements of speeds and rates of sugars conversion up to 48 h indicate a long term influence of the bioextrusion. Gain observed are steady for the pretreated wheat straw whereas it increases with time for corn residues and birch barks. Post-extrusion, a negative influence of the substrate loading is measured. However, best enhancements for the glucose conversion of pretreated wheat straw are detected for high substrate and enzymes loadings. From 4 to 48 h, significant losses in xylose conversion are measured with previous bioextrusion. Indicators of the solid fraction deconstruction, observed during the bioextrusion step, indicate a stronger biomass degradation after 48 h. Improvements of glucose conversion rates can be associated with good mixing conditions of the extruder, especially due to the use of kneading elements. Enzymes are probably more homogeneously distributed (distributive mixing) and can access more catalytic sites available. Moreover, dispersive mixing limits the enzyme jamming due to the biocatalysts concentration. Extrusion process permits an better agitation efficiency, good mass transfer conditions and probably a higher contact between substrate and enzymes. Lower xylose conversion results may be attributed to non-specific adsorptions or inactivation phenomena due to mechanical constraints and lignin residues. Good deconstruction results on the solid fraction may be associable with a synergetic action between mechanical and biochemical constraints. Autofluorescent signal analysis of the lignin fraction show its evolution during the deconstruction of the solid residue. During the hydrolysis, a progressive production of very small particles, appearing to be associated with the lignin fraction is observed. Lignin-carbohydrate complexes are also detected in the liquid fraction. These heteropolymeric complexes, difficult or even impossible for the enzymes to hydrolyze, are an obstacle to the biomass valorization. If lignin deconstruction is mainly due to the alkaline pretreatment, bioextrusion process seems to reduce the proportion of these heteropylymers with high molecular weights
Vera-Sorroche, Javier. "Thermal homogeneity and energy efficiency in single screw extrusion of polymers : the use of in-process metrology to quantify the effects of process conditions, polymer rheology, screw geometry and extruder scale on melt temperature and specific energy consumption." Thesis, University of Bradford, 2014. http://hdl.handle.net/10454/13965.
Повний текст джерелаHeel, Annika Kristin [Verfasser]. "Solvent-Free Processes for the Formation of β-Cyclodextrin Inclusion Complexes Within a Melt-Twin-Screw-Extruder / Annika Kristin Heel". Kiel : Universitätsbibliothek Kiel, 2018. http://d-nb.info/1156602025/34.
Повний текст джерелаFaye, Mamadou. "Nouveau procédé de fractionnement de la graine de Neem (Azadirachta Indica A. Jussi) sénégalais : production d'un bio-pesticide d'huile et de tourteau." Thesis, Toulouse, INPT, 2010. http://www.theses.fr/2010INPT0070/document.
Повний текст джерелаOriginally from India, neem (Azadirachta indica Juss.) is a tree found in the dry tropics and subtropics of Asia, America and Africa. In Senegal, it produces an average of 50 kg per year of a fruit as a drupe ellipsoid, which generally contains a seed, with an average weight of 270 ± 30 to 91% dry matter. The variability of seeds (45 to 48% of capsular cellulose 52-54%, 24-28% hemicellulose, lignin 7-9% 52-55% almonds: 45 to 58% lipids, proteins 20 to 23% j) and extracted oils (palmitic acid: 17 to 19%, stearic: 14.5 to 17.5%, oleic acid: 42 to 48.5%, linoleic: 16.5 to 20% total sterols: 3 5 g / kg) was analyzed for five regions of Senegal. Extraction of azadirachtin, the main active ingredient of the plant seed by different solvents (methanol, ethanol, water) shows a content of 2 g per kg of seed, mainly localized in the kernel (3.9 g / kg ). The expression conditions of neem seed oil were studied in single-screw press OMEGA 20 and twin-screw CLEXTRAL BC 21. Under optimum conditions, 65 and 68% of the oil is expressed, from 7 to 10% of azadirachtin are entrained with the oil and meal contains 14% fat, 14% protein and about 2 g / kg azadirachtin. Watery splitting under intense shear seeds, led to the extraction of 55% lipids, 50% protein and 80% of azadirachtin, separated as a stable emulsion, composition: water 70% oil 25%, 4% protein, 6 g azadirachtin / kg, and an aqueous phase. The study of the implementation of the method of extraction and separation, twin-screw extruder and then CLEXTRAL BC 21 BC 45, produces continuous stable emulsion 0.3 kg per kg of treated seed (20 kg / h) with a ratio water / seed of 2 and a temperature of 60 ° C. The cake contains only 0.6 g / kg of azadirachtin, and stable emulsion which contains 5 g / kg can be directly implemented in the formulations of insecticide biosourced completely
Mondadori, Nilcéa Mares da Luz. "Processamento de compósitos de poli (tereftalato de etileno) reciclado reforçado com fibras de vidro." reponame:Repositório Institucional da UCS, 2007. https://repositorio.ucs.br/handle/11338/237.
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In this work, flake and post-condensed PET composites of different glass fiber contents (0, 20, 30 and 40%) were prepared. Tow kinds of fibers were employed: one fiber having an amino silane-based surface treatment and another one having an epoxi silane-based surface treatment. The composites were extruded in a single-screw extruder with a barrier double-flight screw, and in a co-rotating interpenetrating twin-screw extruder. After extrusion the composites were injected at 120°C, this temperature being chosen after several tests indicating that it could promote the highest possible degree of crystallinity of the final product (higher than 30%). The composites were characterized as for mechanical, thermal and morphological features. Data indicate that by using a single-screw extruder proper to the processing of PET and fiber glass the properties of the obtained composites are fairly good, being comparable to those obtained from a twin-screw extruder. As for the types of PET utilized, it could be found that the molar mass of the polymeric matrix, larger for the post-condensed PET had some influence on the performance of the tested properties. On the other hand it could be observed that the surface treatment of the fibers does not influence the obtained data. Based on the optical analysis of the fiber length and the elastic modulus data it is possible to determine that the fibers of the injected composites are oriented longitudinally to the strain direction. With the aid of scanning electron microscopy (SEM), improvements in the distribution and dispersion of the fibers were always observed, with smaller voids as the fiber content increases, backing higher mechanical data as the incorporated fiber content is increased. Crystallinity resulting from injection-molded test specimens processed at 120°C, together with the presence of the glass fiber leads to a synergism in the heat distortion temperature (HDT). X-rays analyses indicate that at higher fiber content the composites show lower definition of the crystalline peaks, this being associated to the amorphous feature of the fiber.
Gnana, Mani Joseph Wilfred [Verfasser], H. [Akademischer Betreuer] Altenbach, H. J. [Akademischer Betreuer] Radusch, and R. H. [Akademischer Betreuer] Schuster. "Continuous mixing of silica based rubber, filler-composites in twin screw extruder / Joseph Wilfred Gnana Mani. Betreuer: H. Altenbach ; H.-J. Radusch ; R. H. Schuster." Halle, Saale : Universitäts- und Landesbibliothek Sachsen-Anhalt, 2010. http://d-nb.info/1024976033/34.
Повний текст джерелаAgrawal, Akash. "Examining the Effectiveness of Different Mixing Elements in the Twin Screw Compounding of Liquid Crystal Polymer and Polypropylene." Case Western Reserve University School of Graduate Studies / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=case1512742062745962.
Повний текст джерелаButterfield, Craig. "A novel laboratory dispersive and distributive minimixer and applications : development of a new minimixer that can duplicate mixing which occurs in a large twin screw extruder." Thesis, University of Bradford, 2009. http://hdl.handle.net/10454/4930.
Повний текст джерелаBryson, Latoya G. "Monomer recovery from nylon carpets via reactive extrusion." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/22618.
Повний текст джерелаCommittee Chair: Muzzy, John D.; Committee Member: Cook, Fred L.; Committee Member: Jones, Christopher W.; Committee Member: Mayor, J. Rhett; Committee Member: Realff, Matthew J.; Committee Member: Schork, F. Joseph.
Barbosa, Rafael. "Desenvolvimento de novos compostos de borracha natural a partir da desvulcanização em extrusora com rosca dupla." Universidade Federal de São Carlos, 2017. https://repositorio.ufscar.br/handle/ufscar/9057.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
The present study investigated the utilization efficiency of an intermeshing co-rotating twin-screw extruder (ICTSE) in the devulcanization of natural rubber compounds (NR), evaluating the physical, chemical and mechanical characteristics of these materials in each project step. Three accelerated compounds with different sulfur concentrations were submitted to torque rheometry and vulcanized according these results aiming the achievement of elastomers with different crosslinks densities. The influences on the characteristics of the devulcanized material caused by the variation of the extruder barrel temperature, screw rotation, thermoplastics addition and material stiffness were evaluated. Thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), infrared spectroscopy (FTIR), soluble fraction extraction and crosslink density were performed, evaluating the devulcanized compound. Horikx's theory was also used as an indicator of selective crosslink cleavage, defining the compounds to be revulcanized for comparison with the virgin pure material. The revulcanization was carried out with the mixture of the devulcanized compound with the pure, in the proportions of 30/70 w/w, respectively, and in the devulcanized compound singularly, with addition of complementary vulcanization system in both cases. The mechanical, dynamic-mechanical and crosslink density properties of the revulcanized compounds were characterized and evaluated in relation to the properties of the pure compounds. The increase in the concentration of uncrosslinked BN chains and the concentration of sulfur compounds in the extruded samples was observed by thermal tests and spectrocopy, together with the verification of a high level of devulcanization percentage, according to Flory-Rehner, evidencing the regeneration of the natural rubber existent. Also, satisfactory mechanical properties were found in the revulcanized compounds, especially when using auxiliary thermoplastics, revealing the great potential of ERDCI processing for the reuse of discarded BN compounds.
O presente estudo avaliou a eficiência de utilização de uma extrusora com rosca dupla co-rotacional e interpenetrante (ERDCI) na desvulcanização de compostos de borracha natural (BN), avaliando as características físicas, químicas e mecânicas destes materiais em cada fase do projeto. Três compostos acelerados com diferentes concentrações de enxofre foram submetidos a reometria de torque, e vulcanizados de acordo com a curva reométrica, para obtenção de elastômeros com diferentes densidades de ligações cruzadas. Foram avaliadas as influências nas características do material desvulcanizado, causadas pela variação da temperatura do barril da extrusora, velocidade de rotação das roscas, adição de termoplásticos e módulo elástico do material. Análises de termogravimetria (TGA), calorimetria exploratória diferencial (DSC), espectroscopia no infravermelho (FTIR), fração solúvel (FS) e densidade de ligações cruzadas foram realizadas, avaliandose o composto desvulcanizado. A teoria de Horikx também foi utilizada como indicativa da seletividade de ruptura de ligações cruzadas, definindo os compostos a serem revulcanizados para comparação com o material virgem. A revulcanização foi realizada com a mistura de 30 %(m/m) do composto desvulcanizado e 70 %(m/m) do puro, e também com 100 % do composto desvulcanizado, e adição de sistema de vulcanização complementar. Caracterizou-se os compostos revulcanizados quanto às suas propriedades mecânicas, dinâmico-mecânicas e densidade de ligações cruzadas. Através dos ensaios TGA, DSC, FTIR e a verificação de alto nível de percentual de desvulcanização pela teoria de Flory- Rehner, foi observado o aumento da concentração de cadeias de BN não reticuladas e da concentração de compostos de enxofre nas amostras extrudadas, evidenciando a regeneração da BN presente nos compostos. Também foram encontradas propriedades mecânicas satisfatórias nos compostos revulcanizados, principalmente quando utilizados termoplásticos auxiliares, revelando o grande potencial do processamento por ERDCI para a reutilização de compostos de BN descartados.
Zhang, Xian-Ming. "Simulation par CFD et mesure en ligne de la distribution des temps de séjour et la qualité de mélange dans une extrudeuse bi-vis." Thesis, Vandoeuvre-les-Nancy, INPL, 2008. http://www.theses.fr/2008INPL066N/document.
Повний текст джерелаThe development of new materials with improved properties seems to rely nowadays more on blending and compounding than on the synthesis of chemically new polymers. Mixing may have a great effect on the morphology and structure of multi-component polymer materials. Twin-screw extruders (TSE) are widely used as mixers/reactors for blending, compounding, and reactive processing. This work aimed at developing a new instrument to measure in real time the residence time distribution (RTD) which characterizes the axial mixing and transport abilities of different screw elements based on the analysis of the transient flow pattern and systematic evaluation of mixing theory in TSE. Distributive mixing of polymer melts is characterized by the generation of interfacial area, which is experimentally much more difficult to measure. This 3D numerical simulation based on CFD is adopted
Gai, Jing-Gang. "Etudes théoriques et expérimentales de la processabilité du polyéthylène à ultra-haute masse molaire." Thesis, Vandoeuvre-les-Nancy, INPL, 2009. http://www.theses.fr/2009INPL039N/document.
Повний текст джерелаThe development of new materials with improved properties seems to rely nowadays more on blending and compounding than on the synthesis of chemically new polymers. Mixing may have a great effect on the morphology and structure of multi-component polymer materials. Twin-screw extruders (TSE) are widely used as mixers/reactors for blending, compounding, and reactive processing. This work aimed at developing a new instrument to measure in real time the residence time distribution (RTD) which characterizes the axial mixing and transport abilities of different screw elements based on the analysis of the transient flow pattern and systematic evaluation of mixing theory in TSE. Distributive mixing of polymer melts is characterized by the generation of interfacial area, which is experimentally much more difficult to measure. This 3D numerical simulation based on CFD is adopted
Belyamani, Imane. "Développement d'un matériau thermoplastique biodégradable et hydrosoluble à base d'une protéine du lait." Phd thesis, Université Jean Monnet - Saint-Etienne, 2011. http://tel.archives-ouvertes.fr/tel-00702749.
Повний текст джерелаLai-F. "Melt conveying in counter-rotating twin-screw extruders." Thesis, Imperial College London, 1985. http://hdl.handle.net/10044/1/37751.
Повний текст джерелаTheng, Dyna. "Feasibility of incorporating treated lignin and cellulose nanofiber in fiberboards made from corn stalk and rice straw." Doctoral thesis, Universitat de Girona, 2017. http://hdl.handle.net/10803/461717.
Повний текст джерелаEls residus agrícoles tenen un gran interès per ser un material abundant , barat, àmpliament disponible a tot el món i renovable. Es tracta d'una bona opció per substituir la fusta, i presenta característiques físiques i químiques similars a aquesta. La present tesi doctoral estudia la possibilitat de substituir la fusta i els aglutinants sintètics per residus de cultius i adhesius naturals respectivament en la producció panell de fibres. La biomassa de blat de moro i arròs sotmesa a un tractament termomecànic (TMP)es va seleccionar com a matèria primera. El panell de fibra resultant d'ambdós residus sense cap tipus d'aglutinant presentaven propietats mecàniques més baixes que els panells comercials (que contenien un lligant sintètic). Respecte a les propietats físiques, es va observar un augment de volum i espessor al absorbir aigua menors en el panell de fibres naturals que no pas en els comercials. En general, el present estudi mostra una forma més sostenible i efectiva de produir panells de fibra a base de cel·lulosa sense utilitzar aglutinant sintètic, fet que contribueix a la millora d’aspectes tècnics i ambientals en el procés de fabricació dels panells de fibra
Sax, Gerhard Ludwig. "Twin-screw extruded lipid implants for controlled drug delivery." Diss., lmu, 2012. http://nbn-resolving.de/urn:nbn:de:bvb:19-146306.
Повний текст джерелаJaffer, Shafiq A. "Experimental studies of static mixers and twin screw extruders." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0006/NQ42854.pdf.
Повний текст джерелаJaffer, Shaffiq A. "Experimental studies of static mixers and twin screw extruders /." *McMaster only, 1998.
Знайти повний текст джерелаCovas, Jose A. C. G. "Processing of UPVC in single and twin screw extruders." Thesis, Loughborough University, 1985. https://dspace.lboro.ac.uk/2134/11942.
Повний текст джерелаLenhard, Allison N. "Review of energy harvesting methods for twin screw extruders." Thesis, Massachusetts Institute of Technology, 2020. https://hdl.handle.net/1721.1/127922.
Повний текст джерелаCataloged from the official PDF of thesis.
Includes bibliographical references (pages 44-48).
Energy harvesting is the process of accumulating and storing energy from residual sources for use in powering electronic devices. Low-power energy harvesting technologies typically utilize either mechanical, thermal, radiation, flow-based, or bio-chemical energy sources. Research in low-power energy harvesting technologies is motivated by an increased interest in the Internet of Things and the need to create isolated electronic systems, such as 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, and working extensively on machine maintenance. However, it becomes difficult to integrate a condition monitoring system into the machinery because of the lack of accessibility. Condition monitoring would have to occur in the process section of the twin screw extruder, but the nature of the process section makes it difficult to implement a traditionally wired and powered condition monitoring system. A condition monitoring system powered by energy harvesting techniques would be ideal for a twin screw extruder. The shaft mechanical vibrations, high temperature thermal dissipation, and polymer fluid dynamics present in a twin screw extruder can potentially be used in an energy harvesting system. After a literature review, mechanical vibrations and temperature gradients were regarded as the best potential energy harvesting drivers. Based on preliminary analysis of the system, vibrational energy harvesting is predicted to produce between 3.35-16.75 mW of power, while thermally driven energy harvesting is expected to produce between 8-15 mW of power. The estimated power output would be significant enough to power a low-power consumption strain sensor and has the potential to power other sensors as well.
by Allison N. Lenhard.
S.B.
S.B. Massachusetts Institute of Technology, Department of Mechanical Engineering
Schuler, Werner. "Process engineering design of co-rotating twin screw extruders." Thesis, Swansea University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.572814.
Повний текст джерелаJi, Wei-Yun. "Développement d'un concept d'agent compatibilisant-traceur réactif visant à étudier l'évolution de la réaction interfaciale et de la morphologie de mélanges de polymères réactifs." Thesis, Université de Lorraine, 2016. http://www.theses.fr/2016LORR0247/document.
Повний текст джерелаPolymer blending is a common method to prepare high-performance polymer materials. However, most polymer pairs are thermodynamically immiscible, leading to phase separation and deterioration in material properties. To overcome such problems, the most common method is reactive compatibilization which is based on the in-situ formation of a graft or block copolymer by interfacial reaction between reactive polymers. This thesis aims at developing a concept of reactive compatibilizer-tracer which will allow using small amounts of reactive compatibilizers to evaluate their compatibilizing efficiency in industrial scale twin screw extruders, on the one hand; and to characterize the mixing performance of a twin screw extruder as a function of process conditions and/or screw profile. Its main contributions are summarized below. 9-(methylaminomethyl) anthracene (MAMA), a fluorescent molecule, is incorporated into a random copolymer of styrene (St) and 3-isopropenyl-?, ?’-dimethylbenzene isocyanate (TMI), denoted as PS-TMI, to form a reactive compatibilizer-tracer, denoted as PS- TMI-MAMA. The latter serves both as a reactive compatibilizer due to its isocyanate moieties and a tracer due to its fluorescent moieites. It is used for polystyrene (PS)/polyamide 6 (PA6) blends to evaluate its compatibilizing efficiency. Compatibilized PS/PA6 blends are processed in a batch mixer and in a twin screw extruder, respectively. In the case of the batch mixer, the amount of the in-situ formed graft copolymer denoted as PS-g-PA6-MAMA increases and the dispersed phase domain diameter (DDD) decreases drastically in the initial period of mixing. As the mixing further proceeds, the number of PA6 grafts of the PS-g-PA6-MAMA increases, resulting in a highly asymmetrical composition of the PS-g-PA6-MAMA which causes thermodynamic instablility at the interface. As a result, it could be pulled out of the interface to the PA6 phase and form micelles. Once it is pulled out of the interface, it will lose its compatibilizing efficiency and the dispersed phase domain diameter increases sharply. Mixing has a dual effect on the reactive compatibilization process. On the one hand, it promotes the interfacial reaction between the PS-TMI-MAMA and PA6. On the other hand, it aggravates the pull out of the resulting PS-g-PA6-MAMA from the interface. The use of small amounts of the reactive compatibilizer-tracer together with transient experiments for RTD allows assessing the evolutions of the reactive compatibilizer-tracer content (CC), the dispersed phase domain diameter (DDD), and the reacted reactive compatibilizer-tracer content (RCC) as a function of residence time in a twin-screw extruder. Based on the above results, the emulsification curve (DDD vs. CC), the RCC vs. CC curve and effective emulsification curve (DDD vs. RCC) are obtained. When the molar mass of the reactive compatibilizer-tracer is fixed, its compatibilizing efficiency increases with increasing TMI content within an appropriate range. When its TMI content is fixed, the interfacial reaction goes faster as the molar mass of the reactive compatibilizer-tracer decreases within a certain range, and the DDD becomes smaller in a shorter time. The effect of degree of fill fixed by the throughput Q/screw speed N ratio is more dominant than that of residence time. As the degree of fill increases, the interfacial reaction increases and the DDD decreases. As the angle of adjacent the kneading block increases, its distributive and dispersive mixing efficiencies increase, resulting in an increase in interfacial area generation and a decrease in DDD on the basis of the same amount of PS-g-PA6-MAMA. On the other hand, as the width of the kneading block increases, the distributive mixing efficiency increases and the dispersive mixing efficiency remains unchanged. Substitution of kneading blocks by reverse ones increase both the distributive and dispersive mixing efficiencies
Nguyen, Quang Hung. "Study on bioaccumulation and integrated biorefinery of vegetable oil and essential oil of Coriander (Coriandrum sativum L.)." Phd thesis, Toulouse, INPT, 2015. http://oatao.univ-toulouse.fr/16038/1/Nguyen_QH.pdf.
Повний текст джерелаYu, Dingwen. "Development of an intelligent design tool for polymer screw extruders." Thesis, Nottingham Trent University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.324589.
Повний текст джерелаWood, A. K. "The lubricating effects of polymer melts in single screw extruders." Thesis, Manchester Metropolitan University, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.374971.
Повний текст джерела