Готові списки джерел за темами / Screw extruder

Добірка наукової літератури з теми "Screw extruder"

Автор: Grafiati
Опубліковано: 30 травня 2022
Оновлено: 31 травня 2022

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Статті в журналах з теми "Screw extruder"

1

Ab Ghani, Mohd Hafizuddin, and Sahrim Ahmad. "The Comparison of Water Absorption Analysis between Counterrotating and Corotating Twin-Screw Extruders with Different Antioxidants Content in Wood Plastic Composites." Advances in Materials Science and Engineering 2011 (2011): 1–4. http://dx.doi.org/10.1155/2011/406284.

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Water absorption is a major concern for natural fibers as reinforcement in wood plastic composites (WPCs). This paper presents a study on the comparison analysis of water absorption between two types of twin-screw extruders, namely, counterrotating and corotating with presence of variable antioxidants content. Composites of mixed fibres between rice husk and saw dust with recycled high-density polyethylene (rHDPE) were prepared with two different extruder machines, namely, counterrotating and corotating twin screw, respectively. The contents of matrix (30 wt%) and fibres (62 wt%) were mixed with additives (8 wt%) and compounded using compounder before extruded using both of the machines. Samples were immersed in distilled water according to ASTM D 570-98. From the study, results indicated a significant difference among samples extruded by counterrotating and corotating twin-screw extruders. The counterrotating twin-screw extruder gives the smallest value of water absorption compared to corotating twin-screw extruder. This indicates that the types of screw play an important role in water uptake by improving the adhesion between natural fillers and the polymer matrix.
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2

Malik, M., and D. M. Kalyon. "3D Finite Element Simulation of Processing of Generalized Newtonian Fluids in Counter-rotating and Tangential TSE and Die Combination." International Polymer Processing 20, no. 4 (August 1, 2005): 398–409. http://dx.doi.org/10.1515/ipp-2005-0068.

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Abstract A full three-dimensional finite element analysis of the nonisothermal flow of generalized non-Newtonian fluids in counter-rotating tangential twin screw extruder is presented. Previous studies of the simulation of processing in tangential twin screw extruders have focused solely on the twin screw extruder, whereas here the coupled flow and heat transfer occurring in the integrated geometry of the extruder, connected to a die are considered. The FEM based numerical simulation of the coupled momentum-mass-energy conservation equations allowed the determination of the effects of some of the important system parameters, including the power law index and the staggering angle of the screws, on the pumping and pressurization capability of the extruder and the associated degree of fill in the extruder.
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3

He, Liang, Bai Ping Xu, Hui Wen Yu, Xiao Long Wang, and Gang Xue. "Development of the Novel Embedded Planetary-Screw Extruder." Applied Mechanics and Materials 373-375 (August 2013): 2092–97. http://dx.doi.org/10.4028/www.scientific.net/amm.373-375.2092.

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The novel second-generation embedded planetary-screw extruder prototype was successfully developed in the paper which had eight small planetary-screws and had the excellent degassing function. The numerical simulation of the three-dimensional flow and mixing in the metering zone was carried out for different screw configurations to determine the effect of the number of the small planetary-screws using CFD finite volume method technology. We improved the screw combination of the second-generation prototype according to the simulation results as well as the experimental investigations on first-generation embedded planetary-screw extruder we developed some years ago. The second-generation prototype can effectively improve the axial transport capacity and increase output of the extruder when compared with the first-generation prototype. The novel second-generation prototype can expand the scope of application and can improve the quality of processing material. The novel embedded planetary-screw extruders have a better application prospect.
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4

Ren, Jianhua, Junjie Zhao, and Xinyi Liu. "The application of genetic algorithm for the design of screw in twin-screw extruder." World Journal of Engineering 14, no. 5 (October 2, 2017): 451–58. http://dx.doi.org/10.1108/wje-05-2017-0115.

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Purpose With the twin screw extruder being widely used, there are a lot of parameters considered in the method, and the extruder’s volume is an important parameter of twin screw extruders among them. In this paper, some of the extruder parameters such as the impacting extruder volume are introduced, and the mathematical relationship in these parameters is interpreted. The minimum power consumption is the goal of the authors’ structural design. Design/methodology/approach This paper further applies genetic algorithm, a kind of intelligent optimization methods, to obtain the most optimized design dimension, and power consumption function related to unit output of extruder is used as the optimizing target. Meanwhile, this paper takes channel depth of feeding section, channel depth of extrusion section affecting the energy consumption, the width of flight top and helix angle as design variables. Findings By using genetic algorithm, the optimal structure size is obtained, and the power consumption is minimum. Originality/value With the use of optimizing the structure, the power of consumption is reduced. This method has important economic significance and important social significance on energy saving.
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5

Gao, Yuan Lou, Xin Wang, and Li Zhou. "The Impact of Different Screw Edge Width on Extrusion Quality of the Single-Screw Extruder." Advanced Materials Research 926-930 (May 2014): 833–37. http://dx.doi.org/10.4028/www.scientific.net/amr.926-930.833.

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The screw edge width is usually selected based on experience when designing screw extruders, and it is difficult to get the best extrusion quality. The extrusion process of screw extruder is a process of multi-phase flow, which includes gas, liquid and solid. Making it simplified to single-phase flow process can cause relatively large error. This paper adopts the method of multi-phase flow to simulate the extrusion process of single-screw extruder based on different screw edge width by using the finite element analysis software, and get the conclusion that increasing the screw edge width appropriately under the condition that the production efficiency is acceptable is helpful to improve the extrusion quality of single-screw extruders.
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6

He, Liang, Bai Ping Xu, Hui Wen Yu, Xiao Long Wang, and Gang Xue. "Investigation of Mixing Performance in the Extruder with Embedded Planetary-Screws." Advanced Materials Research 781-784 (September 2013): 2809–16. http://dx.doi.org/10.4028/www.scientific.net/amr.781-784.2809.

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The novel geometrical configuration of embedded planetary-screws is proposed in the paper. The corresponding numerical simulation and the experimental investigation are carried out to characterize the mixing performance. Adopting commercial software FLUENT, the simplified physical model is presented with the boundary conditions imposed by UDF codes which are developed by us. Compared with the traditional single screw extruder, the flow and mixing are primarily investigated by using particle tracking technology. The sensitivity to initial positions is found in the novel screw configuration, which is caused by the periodic perturbation of planetary-screws. In contrast, the traditional laminar mixing occurs in single screw extruders. Compared with the traditional twin screw extruder, the experimental characterization of filled system of adding active nanometer CaCO3 into LLDPE matrix is conducted. No obvious difference in dispersion of CaCO3 is found when the extrusion samples are observed through scanning electron microscopy (SEM), on the condition that the both extrusion outputs are equal. The shear rate in the novel screw configuration is relatively smaller, and the extrusion characteristic is more excellent.
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7

Peng, HQ, JH Yan, SD Zhang, and WJ Mo. "Degradation of recycled flame-retardant GFPBT during extrusion: Effect of screw types on the extrudate properties." Journal of Reinforced Plastics and Composites 36, no. 12 (March 10, 2017): 864–77. http://dx.doi.org/10.1177/0731684417693699.

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For both environmental and economic consideration, the use of recycled glass fiber-reinforced flame retardant poly(butylene terephthalate) (RGFFRPBT) is of significant importance. In the study, the mechanical, thermal, rheological, and flame retardant properties of RGFFRPBT granulated by different extruders were evaluated. To explore the relationship between the screw structure and the properties of the extruded RGFFRPBT, the carboxyl content (CC), and intrinsic viscosity ([Formula: see text]) of the processed polymer and the average GF length ([Formula: see text]) were investigated. Increasing the shear force of the extruder caused both [Formula: see text] and [Formula: see text] to decrease, whereas the CC increase. Variations of these parameters had a different effect on the properties of the RGFFRPBT. Both of mechanical and thermal properties of extruded RGFFRPBT deteriorated with the increase of screw shear force, while the thermal flowability improved. Furthermore, all the extruded products were classified as V-0 with LOI of 32.2%, and passed the glow wire ignition temperature test (GWIT). The results confirmed that the degradation of properties of RGFFRPBT can be controlled by screw-type extrusion. RGFFRPBT granulated by a single screw extruder with 30 mm diameter and length to diameter ratio of 30 was found to produce material with properties meeting the requirements for electronic and electrical applications.
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8

Kubota, Kazuhisa, Ryszard Brzoskowski, James L. White, Frederick C. Weissert, Nobuyuki Nakajima, and Kyonsuku Min. "Comparison of Screw Extrusion of Rubber Compounds with Different Extruder/Screw Combinations." Rubber Chemistry and Technology 60, no. 5 (November 1, 1987): 924–44. http://dx.doi.org/10.5254/1.3536165.

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Abstract The extrusion of rubber compounds has long been an area of industrial importance. There have, however, been few basic studies on the flow characteristics of rubber compounds. Considerably more extensive investigations have been reported on the mechanisms of screw extruders for thermoplastics. The latter researches are summarized in the monograph by Tadmor and Klein and the textbook of Tadmor and Gogos. Maddock, and others carried out experimental studies which led to basic flow mechanisms of thermoplastics in screw extruders. Maddock fed pigmented pellets to screw extruders and pulled screws from the barrel with the plastic stips in it, which were then unwound and cross-sectioned. Few screw-pulling investigations have been published for rubber compounds. We are only familiar with the work of Menges and Lehnen and our own recent studies. In the present paper, we describe a fundamental study of flow mechanisms in screw extruders for rubber compounds. We expand our studies based on the Maddock screw-pulling procedure, with rubber strips containing markers in a comparison of three different screw extruders. The placement of the rubber is recorded and the rubber sections examined for their flow patterns. This work also extends our earlier market experiments on flow of rubber compounds through dies. Our results on screw extruders exhibited both transverse flow patterns and sometimes showed a starved, partially filled screw. Our efforts in the present paper seek to generalize these results. We also describe a theoretical model for the flow of rubber compounds in a screw extruder and compare it to our experiments.
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9

Kushnir, V. G., N. V. Gavrilov, and A. S. Kushnir. "Substantiation of design parameters of extruder and determination of extrudate quality." Traktory i sel hozmashiny 83, no. 2 (February 15, 2016): 7–10. http://dx.doi.org/10.17816/0321-4443-66118.

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The article reviews the designs of extruders and screws. It describes the main known methods of determination of material quality. As a technical solution improving the design of extruder, a double-threaded screw that should be installed in the material forming zone is proposed.
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10

Shin, Kyung Chul, and James L. White. "Simulation of Non-Newtonian Flow of Rubber Compounds in a Pin Barrel Screw Extruder." Rubber Chemistry and Technology 70, no. 2 (May 1, 1997): 264–70. http://dx.doi.org/10.5254/1.3538431.

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Abstract A simulation is presented of flow of a rubber compound, modeled as a power law non-Newtonian fluid, in screw designs including screws with slices and a pin barrel extruder. Calculations were carried out using the flow analysis network (FAN) technique. Pressure fields, flux fields, and screw characteristic curves were determined. Introducing non-Newtonian (shear-thinning viscosity) characteristics reduces screw pumping ability. Slices in screw flights produce backward fluxes in the screw channel and reduce pumping capacity. Introduction of pins into the barrel has only a minor effect on screw pumping characteristics, and the pumping capacity of a pin barrel extruder closely resembles that in a screw extruder with slices in its screw flights.
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Дисертації з теми "Screw extruder"

1

Djuric, Dejan. "Continuous granulation with a twin-screw Extruder." Göttingen Cuvillier, 2008. http://d-nb.info/989861163/04.

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2

Kulshreshtha, 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.

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3

Kalali, 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.

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Mixing is crucial in most polymer processing operations towards obtaining high-quality products (e.g. tubing, tire treads and wire coverings). Material type, screw design, and processing conditions all affect mixing profoundly. Different types of mixing elements have been developed to improve mixing in the single screw extruder; however, the selection of these mixing elements is not trivial. In this work, our purpose is to provide quantitative tools to select the best mixing element. Residence time distribution (RTD) and image analysis were used to compare mixing in three different mixing elements: single flight, Maddox, and Saxton. Residence time distributions were used to indirectly grasp an insight about the strain distribution inside the extruder. Experimental RTD data were derived from silica tracer studies and compared to various mixer models. A model based on a plug flow mixer in series with two continuous stirred tanks best fit the experimental data in all three different mixing elements. For the image analysis method the degree of mixing was determined. Mixtures of polyethylene resins with carbon black were extruded and sliced. Subsequently, sliced samples were scanned to provide images showing the distribution of the carbon black in the resin. The RTD experiments showed that the mean residence time is highest in the Saxton mixer and the lowest in the single flight element. Also, the RTD was broadest in the Saxton mixer and narrowest in the single flight mixer. This means that the polymer in the Saxton mixer experiences the widest range of strains and gets mixed more thoroughly. These results were confirmed by image analysis, which showed that polymers mixed in the Saxton mixer were more homogenously mixed compared to the two other mixing elements.
Les 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.
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4

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.

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5

Van, Niekerk Werner. "Development of a multi-purpose twin-screw extruder / Werner van Niekerk." Thesis, North-West University, 2009. http://hdl.handle.net/10394/5088.

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6

Rodriguez, 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.

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7

Knott, Brian. "Effective control of a low-cost twin-screw food extruder / Brian Knott." Thesis, North-West University, 2006. http://hdl.handle.net/10394/1640.

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8

Singh, 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.

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The basic understanding of mixing 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 determination of residence time distribution (RTD) and of the paths taken by tracers added to the melt. The axial mixing and the effects of varius parameters on it were established by studying RTD using tracer techniques. As the tail of the distribution is of paramount importance, the reproducibility of the RTD curve was extensively studied. Radioactive NnO2 was used as a tracer and detected by gamma ray spectroscopy giving more reproducible results than added barytes estimated gravimetrically after ashing. Shock cooling of the extruder and sectioning of the solidified compound in the screw channels was used to-study the flow mechanism. The maximum throughput achieved, polymer melting mechanism, filled volume and axial mixing Are interrelated, and are dependent on the configuration and position of segmented mixing discs present in the screw profile. In the upstream position these act as melting discs and their efficiency is increased in a closed configuration. Initial melting is achieved over a remarkably short distance along the screw profile. The screw speed affects the axial mixing which is shown to be related to the net relative pressure change at the screw tips. A flow model is proposed such that the overall material flow taking place in an anticlockwise direction along the screw channel comprises two separate flow regimes. The upper regime rotates anti-clockwise and is made up of main and small tetrahedron flow and calender flow. The lower flow regime rotates clockwise and is made up of main and small side leakage flows and a portion of the main tetrahedron flows together with a central flow. The flow studies show conclusively that the melt from a particular site ahead of the intermeshing zone occupies a predestined site after passing through the intermeshing zone.
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9

Chen, 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.

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The importance of the residence time distribution (RTD) in polymer extrusion has been recognized for along time, however, it is very difficult to measure. In this project, an optical on-line RTD measurement technique based on extrudate transmittance changes was investigated. A He-Ne laser beam was the light source, and carbon black was the tracer and detection was performed by a photomultiplier.
The 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%.
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10

Mastio, Michael Joseph Becker Bryan R. "Material wear and failure mode analysis of breakfast cereal extruder and screw elements." Diss., UMK access, 2005.

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Thesis (Ph. D.)--School of Computing and Engineering and Dept. of Mathematics. University of Missouri--Kansas City, 2005.
"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.
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Книги з теми "Screw extruder"

1

Kohlgrüber, Klemens, ed. Co-Rotating Twin-Screw Extruder. München: Carl Hanser Verlag GmbH & Co. KG, 2007. http://dx.doi.org/10.3139/9783446433410.

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2

Shah, Khalid H. Reactive polymerisation of caprolactam in a co-rotating intermeshing twin screw extruder. Uxbridge: Brunel University, 1992.

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3

Singh, Devendra Pal. Flow and mixing studies in a co-rotating intermeshing twin screw extruder. Uxbridge: Brunel University, 1988.

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4

Tempel, Mark. In-line monitoring of the interface of PP/LLDPE blends in a single-screw extruder. Ottawa: National Library of Canada, 1996.

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5

Ebrahimi-Moshkabad, Morteza. A study of a twin screw extruder with catalyst immobilised on the screws for catalytic hydrogenation of highly viscous solutions. Birmingham: University of Birmingham, 1998.

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6

Orchard, Stephen Frederick. Reactive extrusion: The use of a co-rotating, intermeshing twin-screw extruder to perform catalytic hydrogenation of soya bean oil using immobilised and slurry catalysts. Birmingham: University of Birmingham, 1998.

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7

Campbell, Gregory A., and Mark A. Spalding. Analyzing and Troubleshooting Single-Screw Extruders. München: Carl Hanser Verlag GmbH & Co. KG, 2013. http://dx.doi.org/10.3139/9783446432666.

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8

Michael, Bierdel, ed. Co-rotating twin-screw extruders: Fundamentals, technology, and applications. Munich [Germany]: Carl Hanser Publishers, 2008.

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9

A, Spalding Mark, ed. Troubleshooting and analysis of single-screw extruders. Hanser Verlag, Carl, 2012.

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10

J. A. C. G. Covas. Processing of UPVC in single and twin screw extruders. 1985.

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Частини книг з теми "Screw extruder"

1

Gooch, Jan W. "Extruder Screw." In Encyclopedic Dictionary of Polymers, 288–89. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_4712.

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Gooch, Jan W. "Screw Extruder." In Encyclopedic Dictionary of Polymers, 649. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_10367.

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3

Gooch, Jan W. "Extruder, Planetary Screw." In Encyclopedic Dictionary of Polymers, 288. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_4709.

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4

Gooch, Jan W. "Extruder, Twin-Screw." In Encyclopedic Dictionary of Polymers, 289. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_4715.

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Gooch, Jan W. "Double-Screw Extruder." In Encyclopedic Dictionary of Polymers, 241. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_3961.

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6

Rauwendaal, Chris. "Extruder Screw Design." In Polymer Extrusion, 509–652. München: Carl Hanser Verlag GmbH & Co. KG, 2014. http://dx.doi.org/10.3139/9781569905395.008.

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7

Gooch, Jan W. "Single-Screw Extruder." In Encyclopedic Dictionary of Polymers, 668. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_10687.

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8

Gooch, Jan W. "Twin-Screw Extruder." In Encyclopedic Dictionary of Polymers, 775. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_12241.

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9

Gooch, Jan W. "Planetary-Screw Extruder." In Encyclopedic Dictionary of Polymers, 540. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_8798.

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10

Stevens, M. J., and J. A. Covas. "Twin-screw extruders." In Extruder Principles and Operation, 316–51. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0557-6_10.

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Тези доповідей конференцій з теми "Screw extruder"

1

Ozsipahi, Mustafa, Sertac Cadirci, and Hasan Gunes. "Numerical and Analytical Investigation of Viscous Fluids in a Screw Extruder." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-66124.

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Анотація:
This study presents a flow model for a single screw extruder which has been investigated by means of analytical and numerical methods. Flow phenomena in single screw extruders has evoked attention of many researchers since non-Newtonian type of fluid transport by an extruder is utilized in many industrial applications. In this study we focused on the Newtonian-type of fluid transport by a single screw extruder since we aimed to generate an analytical model for the simplified Navier-Stokes equations under certain boundary conditions. The analytical model for a steady, laminar, isothermal and incompressible flow is derived using integral transform technique for a highly viscous flow where the convective acceleration terms are assumed to be negligible. Numerical investigation is conducted by an incompressible, laminar, finite volume based flow solver using a Volume of Fluid (VoF) approximation. An appropriate single-screw extruder model is used for the simulations. The novelty of the study relies on the usage of a simplified analytical model for a highly viscous flow and the comparison between the analytical and numerical results where the numerical results are obtained by a two-phase flow solver for the full Navier-Stokes equations using the complex extruder geometry.
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2

Jaluria, Yogesh. "Validation of Twin-Screw Polymer Extruder Modeling." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-33825.

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The mathematical and numerical modeling of twin-screw polymer extruders is examined with respect to accuracy of results and validity of the simulation. A numerical model is developed incorporating the translation region, which is similar to a single-screw extruder channel, and the intermeshing, or nip, region. The numerical modeling is carried out for steady and time-dependent operation, considering various polymeric materials like polyethylene and corn meal. A range of design parameters and operating conditions are considered. The results are evaluated in terms of the expected physical behavior of the system and compared with experimental results available in the literature to determine the accuracy of the predictions. In many cases, only qualitative comparisons are possible since the operating conditions and design parameters are not explicitly known. However, the basic trends are as expected and good quantitative comparisons with experimental data is used to validate the model. Validated numerical models can extend the domain of relevant inputs for process design and optimization.
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3

Pralhad Parhar Anand and Srinivasa Rao Pavuluri. "Development of Extruded Snacks from Low Value Fish Using Twin Screw Extruder." In 2009 Reno, Nevada, June 21 - June 24, 2009. St. Joseph, MI: American Society of Agricultural and Biological Engineers, 2009. http://dx.doi.org/10.13031/2013.27187.

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4

Drotman, Dylan, Mamadou Diagne, Robert Bitmead, and Miroslav Krstic. "Control-Oriented Energy-Based Modeling of a Screw Extruder Used for 3D Printing." In ASME 2016 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/dscc2016-9651.

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This paper proposes an energy-based approach for modeling a screw extruder used for 3D printing. This approach was used due to the difficulty in measuring the salient variables associated with regulation of the process state. The control-oriented steady-state model for the screw extruder is based on the reliably available process variables of heater current and screw speed, which constitute the manipulated variables. The controlled variable for this extrusion process is the extrusion rate. This model is based on balancing the energy between the work done by the screw, the heat delivered by the heater at the nozzle, and the enthalpy of the extruded product stream. The fine measurement available is the current commanded by the heater control system to maintain a fixed temperature at the nozzle. An array of thermistors are used as feedback for the temperature profile along the extruder. The screw speed is calibrated for a stepping motor used for conveying the material. This steady state model can then be helpful for developing a dynamic model for a controller capable of accurate flow control based on preview of the extrusion rate but with a simple yet robust hardware requirement.
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5

Nehru Chevanan, Kurt A Rosentrater, and Kasiviswanathan Muthukumarappan. "Physical Properties of Extrudates Containing Distillers Grains Extruded in a Twin Screw Extruder." In 2007 Minneapolis, Minnesota, June 17-20, 2007. St. Joseph, MI: American Society of Agricultural and Biological Engineers, 2007. http://dx.doi.org/10.13031/2013.23526.

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6

Mitroshin, V. N., and D. I. Kuleshova. "The System for Stabilization of Screw Extruder Productivity." In 2018 International Multi-Conference on Industrial Engineering and Modern Technologies (FarEastCon). IEEE, 2018. http://dx.doi.org/10.1109/fareastcon.2018.8602886.

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7

Jenshinn Lin and Yuhjen Tsai. "A Study of a Vertical Single-Screw Extruder." In 2001 Sacramento, CA July 29-August 1,2001. St. Joseph, MI: American Society of Agricultural and Biological Engineers, 2001. http://dx.doi.org/10.13031/2013.7477.

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8

Gestring, Ingo, and Dieter Mewes. "Devolatilization of Molten Polymers During Multiphase Flow in a Double Screw Extruder." In ASME 2002 Joint U.S.-European Fluids Engineering Division Conference. ASMEDC, 2002. http://dx.doi.org/10.1115/fedsm2002-31023.

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Devolatilization is a thermal separation process in order to remove low molecular solvents from mixtures of polymers. Extruders with partly filled devolatilization zones are often used for this process. The two-phase flow of the polymer and the evaporating monomers and solvents is complex due to free surfaces. In film flow and two-phase bubbly flow the polymer is heated by dissipation and cooled by evaporation of the low molecular solvent. Temperature and concentration fields are difficult to predict in extruders because of the complex flow field. Therefore the experimental investigations are carried out in special designed apparatus with a flow field similar to that in extruders and in a transparent double-screw extruder to investigate the different flow mechanisms. In order to nucleate bubbles of the volatile component the polymers must be supersaturated and some kind of deformation must exist. The bubble nucleation is shear induced. The changes in concentration during two-phase bubbly flow result in decreasing temperatures. The mass transfer rates are increased due to the large inner surfaces of the bubbles in the foam and so is the cooling by evaporation. The higher the foam expansion the better is the mass transfer.
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9

Dryer, Benjamin, Graeme Fukuda, Jake Webb, David I. Bigio, Mark Wetzel, and Paul Andersen. "Dispersive Mixing Consideration of Twin-Screw Compounding Scale-Up Methodologies." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-51877.

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Twin-screw polymer extrusion has shown increased utility for creating composite materials. However, in order to achieve the desired product properties, sufficient mixing is essential. Dispersive mixing, or the breaking-up of particle agglomerates, is critical to create filled compounds with the required material properties. In a twin-screw compounding process, the Residence Stress Distribution (RSD) has been used to quantify the dispersive mixing induced by the stresses in the polymer melt. These stresses are quantified by the percent break-up of stress-sensitive polymeric beads. It was found that the amount of material that experiences the critical stress is a function of the operating conditions of screw speed and specific throughput [1]. The quantification of dispersive mixing allows for better control of a compounding process and can be used to design new processes. During the development of a new compounding process, screw geometries and operating conditions are often refined on a laboratory-scale extruder and then scaled up to a manufacturing level. Scale-up rules are used to translate the operating conditions of a process to different sizes of extruders. In a compounding process, the goal when scaling-up is to maintain the same material properties on both scales by achieving equivalent mixing. The RSD methodology can be used to evaluate the effectiveness of scale-up rules by comparison between two or more scales. This paper will demonstrate the utility of the RSD in evaluation of two unique scale-up rules. Conventional industry practice is based on the volumetric flow comparison between extruders. The proposed approach demonstrates that in order to maintain equivalent dispersive mixing between different sizes of extruders, the degree of fill, or the percent drag flow (%DF), must be kept equivalent in the primary mixing region. The effectiveness of both rules has been evaluated by experimental application of the RSD methodology. A design of experiment approach was used to generate predictive equations for each scale-up rule that were compared to the behavior of the original small-scale extruder. Statistical comparison of the two scale-up rules showed that the %DF rule predicted operating conditions on the large-scale extruder that produced percent break-up behavior more similar to the small-scale behavior. From these results, it can be concluded that the %DF scale-up rule can be used to accurately scale operating conditions between different-sized extruders to ensure similar dispersive mixing between two processes. This will allow for greater accuracy when recreating the material properties of a small-scale twin-screw compounding process on a larger, mass production machine.
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10

Grimard, Jonathan, Laurent Dewasme, and Alain Vande Wouwer. "Nonlinear model predictive control of a twin-screw extruder." In 2016 20th International Conference on System Theory, Control and Computing (ICSTCC). IEEE, 2016. http://dx.doi.org/10.1109/icstcc.2016.7790666.

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Звіти організацій з теми "Screw extruder"

1

Campbell, Carol. Twin Screw Extruder Production of MTTP Decoy Flares SERDP WP-1240. Fort Belvoir, VA: Defense Technical Information Center, December 2005. http://dx.doi.org/10.21236/ada451087.

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2

Kalyon, Dilhan M. Continuous Processing of Solid Propellants in Co-Rotating Twin Screw Extruders. Fort Belvoir, VA: Defense Technical Information Center, October 1995. http://dx.doi.org/10.21236/ada311920.

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