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Relevant bibliographies by topics / Screw melt extrusion / Dissertations / Theses

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Dissertations / Theses on the topic 'Screw melt extrusion'

Author: Grafiati

Published: 11 December 2022

Last updated: 31 July 2025

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1

Strandberg, Marcus. "Determination and implementation of polymer parameters into simulations of the twin-screw extrusion process." Thesis, Tekniska Högskolan, Högskolan i Jönköping, JTH, Maskinteknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-27184.

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This thesis was conducted in cooperation with a Swedish company that develops and manufactures plastic compounds. An increasing need for identifying material properties is seen within the industry in order to predict the outcome of the extrusion process by using simulations. The purpose of this study was to expand a material database with the results obtained through various measurements of the material parameters in order to enable simulations. The numerical descriptions would be analyzed and validated in relation to the obtained results and conducted methods to enable implementation of the m

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2

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 importanc

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3

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.

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Polymer extrusion is an energy intensive process whereby the simultaneous action of viscous shear and thermal conduction are used to convert solid polymer to a melt which can be formed into a shape. To optimise efficiency, a homogeneous melt is required with minimum consumption of process energy. In this work, in-process monitoring techniques have been used to characterise the thermal dynamics of the single screw extrusion process with real-time quantification of energy consumption. Thermocouple grid sensors were used to measure radial melt temperatures across the melt flow at the entrance to

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4

Dang, Hoang Phuc. "Fabrication and characterisation of 3D printed poly (caprolactone) scaffolds with bimodal porosity for local drug delivery and tissue reconstruction applications." Thesis, Queensland University of Technology, 2020. https://eprints.qut.edu.au/157409/1/Hoang%20Phuc_Dang_Thesis.pdf.

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Tissue reconstruction of large/critical-size defects requires scaffolds that are able to support tissue regeneration combined with other treatments to prevent tissue inflammation and disease recurrence. Therefore, this thesis introduced and characterized a new type of 3D scaffolds having macroscale porosity generated from the printing pattern and intra-strut microscale porosity to be used as a dual-function scaffold for both local drug delivery and tissue reconstruction. The scaffold was proved to provide superior treatment for breast cancer compared with conventional systemic administration m

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5

Wood, Clive John. "Investigation of a solvent-free continuous process to produce pharmaceutical co-crystals : understanding and developing solvent-free continuous cocrystallisation (SFCC) through study of co-crystal formation under the application of heat, model shear and twin screw extrusion, including development of a near infrared spectroscopy partial least squares quantification method." Thesis, University of Bradford, 2016. http://hdl.handle.net/10454/14580.

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This project utilised a novel solvent-free continuous cocrystallisation (SFCC) method to manufacture pharmaceutical co-crystals. The objectives were to optimize the process towards achieving high co-crystal yields and to understand the behaviour of co-crystals under different conditions. Particular attention was paid to the development of near infrared (NIR) spectroscopy as a process analytical technology (PAT). Twin screw, hot melt extrusion was the base technique of the SFCC process. Changing parameters such as temperature, screw speed and screw geometry was important for improving the co-cr

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6

Fu, Tingrui. "PP/clay nanocomposites : compounding and thin-wall injection moulding." Thesis, Loughborough University, 2017. https://dspace.lboro.ac.uk/2134/24655.

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This research investigates formulation, compounding and thin-wall injection moulding of Polypropylene/clay nanocomposites (PPCNs) prepared using conventional melt-state processes. An independent study on single screw extrusion dynamics using Design of Experiments (DoE) was performed first. Then the optimum formulation of PPCNs and compounding conditions were determined using this strategy. The outcomes from the DoE study were then applied to produce PPCN compounds for the subsequent study of thin-wall injection moulding, for which a novel four-cavity injection moulding system was designed usin

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7

Xu, Suxuan. "Fibrous soy protein meat analog from low moisture twin-screw extrusion." Diss., Columbia, Mo. : University of Missouri-Columbia, 2007. http://hdl.handle.net/10355/6035.

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Thesis (M.S.)--University of Missouri-Columbia, 2007.<br>The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on April 16, 2008) Includes bibliographical references.

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8

Vera-Sorroche, Javier, Adrian L. Kelly, Elaine C. Brown, and Philip D. Coates. "Infrared Melt Temperature Measurement of Single Screw Extrusion." 2015. http://hdl.handle.net/10454/9238.

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No<br>An infrared temperature sensor has been used to provide real time quantification of the thermal homogeneity of polymer extrusion. The non-intrusive sensor was located in the barrel of a single screw extruder, positioned such that it provided a measurement of melt temperature in the channel of the metering section of the extruder screw. The rapid response of the technique enabled melt temperature within the extruder screw channel to be monitored in real time, allowing quantification of the thermal stability of the extrusion process. Two polyethylenes were used in experiments with three ex

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9

Kelly, Adrian L., Elaine C. Brown, and Philip D. Coates. "The effect of screw geometry on melt temperature profile in single screw extrusion." 2006. http://hdl.handle.net/10454/3917.

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No<br>Experimental observations of melt temperature profiles and melting performance of extruder screws are reported. A novel temperature sensor consisting of a grid of thermocouple junctions was used to take multiple temperature readings in real time across melt flow in a single screw extruder. Melt pressure in the die and power consumption were also monitored. Three extruder screws at a range of screw speeds were examined for a commercial grade of low density polyethylene. Results showed melt temperature fields at low throughputs to be relatively independent of screw geometry with a flat-sha

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10

Brown, Elaine C., Adrian L. Kelly, and Philip D. Coates. "Melt temperature field measurement in single screw extrusion using thermocouple meshes." 2004. http://hdl.handle.net/10454/3255.

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No<br>The development and validation of a sensor for extrusion melt temperature field measurement is described. A grid of opposing thermocouple wires was constructed and held in position by a supporting frame. Wires were joined together at crossing points to form thermocouple junctions, which were computer monitored. The mesh was used to monitor melt temperature fields during single screw extrusion at the die entrance. Design and construction of the mesh is described in addition to experimental optimization of wire diameter and junction forming. Calibration of the sensor and potential measurem

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11

Deng, J., K. Li, E. Harkin-Jones, et al. "Energy monitoring and quality control of a single screw extruder." 2014. http://hdl.handle.net/10454/10619.

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Yes<br>Polymer extrusion, in which a polymer is melted and conveyed to a mould or die, forms the basis of most polymer processing techniques. Extruders frequently run at non-optimised conditions and can account for 15-20% of overall process energy losses. In times of increasing energy efficiency such losses are a major concern for the industry. Product quality, which depends on the homogeneity and stability of the melt flow which in turn depends on melt temperature and screw speed, is also an issue of concern of processors. Gear pumps can be used to improve the stability of the production line

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12

Vera-Sorroche, Javier, Adrian L. Kelly, Elaine C. Brown, et al. "The effect of melt viscosity on thermal efficiency for single screw extrusion of HDPE." 2013. http://hdl.handle.net/10454/10804.

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Yes<br>In this work, a highly instrumented single screw extruder has been used to study the effect of polymer rheology on the thermal efficiency of the extrusion process. Three different molecular weight grades of high density polyethylene (HDPE) were extruded at a range of conditions. Three geometries of extruder screws were used at several set temperatures and screw rotation speeds. The extruder was equipped with real-time quantification of energy consumption; thermal dynamics of the process were examined using thermocouple grid sensors at the entrance to the die. Results showed that polymer

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13

Abeykoon, Chamil, Adrian L. Kelly, Elaine C. Brown, and Philip D. Coates. "The effect of materials, process settings and screw geometry on energy consumption and melt temperature in single screw extrusion." 2016. http://hdl.handle.net/10454/8772.

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Yes<br>Polymer extrusion is an energy intensive production process and process energy e ciency has become a key concern in the current industry with the pressure of reducing the global carbon footprint. Here, knowledge of the pattern of energy usage and losses of each component in the plant is highly useful in the process energy optimization. Moreover, it is essential to maintain the melt quality while improving the energy e ciency in polymer processing. In this work, an investigation was made on the total energy consumption, drive motor energy consumption, power factor and the melt temper

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14

Kelly, Adrian L., Timothy D. Gough, Mohammad Isreb, et al. "In-process rheometry as a PAT tool for hot melt extrusion." 2017. http://hdl.handle.net/10454/14086.

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Yes<br>Real time measurement of melt rheology has been investigated as a Process Analytical Technology (PAT) to monitor hot melt extrusion of an Active Pharmaceutical Ingredient (API) in a polymer matrix. A developmental API was melt mixed with a commercial copolymer using a heated twin screw extruder at different API loadings and set temperatures. The extruder was equipped with an instrumented rheological slit die which incorporated three pressure transducers flush mounted to the die surface. Pressure drop measurements within the die at a range of extrusion throughputs were used to calculate

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15

Abeykoon, Chamil, P. J. Martin, Adrian L. Kelly, K. Li, Elaine C. Brown, and Philip D. Coates. "Investigation of the Temperature Homogeneity of Die Melt Flows in Polymer Extrusion." 2014. http://hdl.handle.net/10454/10566.

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No<br>Polymer extrusion is fundamental to the processing of polymeric materials and melt flow temperature homogeneity is a major factor which influences product quality. Undesirable thermal conditions can cause problems such as melt degradation, dimensional instability, weaknesses in mechanical/optical/geometrical properties, and so forth. It has been revealed that melt temperature varies with time and with radial position across the die. However, the majority of polymer processes use only single-point techniques whose thermal measurements are limited to the single point at which they are fixe

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16

Abeykoon, Chamil, P. J. Martin, K. Li, and Adrian L. Kelly. "Dynamic modelling of die melt temperature profile in polymer extrusion: Effects of process settings, screw geometry and material." 2014. http://hdl.handle.net/10454/10568.

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No<br>Extrusion is one of the major methods for processing polymeric materials and the thermal homogeneity of the process output is a major concern for manufacture of high quality extruded products. Therefore, accurate process thermal monitoring and control are important for product quality control. However, most industrial extruders use single point thermocouples for the temperature monitoring/control although their measurements are highly affected by the barrel metal wall temperature. Currently, no industrially established thermal profile measurement technique is available. Furthermore, it h

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17

Vera-Sorroche, Javier, Adrian L. Kelly, Elaine C. Brown, et al. "Thermal optimisation of polymer extrusion using in-process monitoring techniques." 2013. http://hdl.handle.net/10454/9742.

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No<br>Polymer extrusion is an energy intensive process, which is often run at less than optimal conditions. The extrusion process consists of gradual melting of solid polymer by thermal conduction and viscous shearing between a rotating screw and a barrel; as such it is highly dependent upon the frictional, thermal and rheological properties of the polymer. Extruder screw geometry and extrusion variables should ideally be tailored to suit the properties of individual polymers, but in practice this is rarely achieved due to the lack of understanding of the process. Here, in-process monitoring t

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18

Duarte, Marisa Isabel Oliveira. "Hot-melt extrusion : production and characterization of HPC-based extrudates." Master's thesis, 2014. http://hdl.handle.net/10451/38747.

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Trabalho Final de Mestrado Integrado, Ciências Farmacêuticas, Universidade de Lisboa, Faculdade de Farmácia, 2014<br>Originally used in plastic industry, the Hot-Melt Extrusion (HME) technique has received considerable attention by pharmaceutical industries in the last years. The main goal of this project was the production of extrudates by HME, using hydroxypropylcellulose (HPC) as a carrier polymer. To the base polymer it was added other excipients – PEG 8000, HPMC K4M, Eudragit E PO, sodium bicarbonate and sorbitol – in order to observe some changes during the extrusion process and in the

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