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Dissertations / Theses on the topic 'Plastic additives'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

Vigren, David. "Migration of Xenoestrogens from Plastic Food Containers during Cooking." Thesis, Örebro universitet, Institutionen för naturvetenskap och teknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-43957.

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Xenoestrogens are compounds, foreign from the body, that can enter cells and interact with the estrogen receptors (ER) to produce an estrogenic response. Many additives used in plastics are compounds with estrogenic activity. Some of these additives are known to slowly leach from the plastics. When using plastic containers as lunchboxes for reheating or food storage, these additives can leach from the plastics and end up in the food. In this project, food simulates were cooked in six different thermoplastic containers, made of polypropylene, in an oven at 100 °C for 15 minutes. Three of the th

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2

Dawidson, Gabriella. "Determination of antioxidants and UV-stabilizers in the environment." Thesis, KTH, Skolan för kemivetenskap (CHE), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-158484.

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Synthetic antioxidants and UV-stabilizers are additives used in plastic products in order to protect the polymers from degradation caused by oxygen and ultraviolet light. Few studies have been performed about the presence of these compound groups in the environment and there is very sparse data on their distribution in the environment in Sweden. The objective of this study was to investigate the presence of ten common antioxidants and UV-stabilizers and two antioxidant metabolites [2-tert-butyl-4-methoxyphenol (1); 2,6-di-tert-butyl-4-methylphenol (2); 3,5-ditert-butyl-4-hydroxybenzaldehyde (3

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3

Wright, Stephanie. "The potential for microplastics to cause harm in the marine environment." Thesis, University of Exeter, 2015. http://hdl.handle.net/10871/18868.

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Plastic debris is an emerging environmental issue, with >10 million tons of plastics debris per annum entering the sea. Exposure to marine conditions facilitates the exponential fragmentation of plastic to micro-sized particles (microplastics). Marine and coastal sediments are a sink for microplastic pollution. Consequently, the ingestion of microplastics by a range of benthic marine invertebrates, including polychaete worms, has been reported in situ. Microplastics are vectors for priority pollutants capable of eliciting adverse health effects. However, the particle and chemical toxicity whic

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Björnsdotter, Maria. "Leaching of Residual Monomers, Oligomers and Additives from Polyethylene, Polypropylene, Polyvinyl Chloride, High-density Polyethylene and Polystyrene Virgin Plastics." Thesis, Örebro universitet, Institutionen för naturvetenskap och teknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-45888.

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Plastic debris are accumulating in our oceans and are degraded into smaller pieces which eventually becomes small enough to be available to lower thropic level organisms. Microplastics, commonly defined as plastic particles <5 mm, are globally distributed and found at remote locations far away from industrialized and populated areas. The effects of macro sized plastics is well understood whilst the effects of microplastics is hard to predict. It is known that microplastics act as transfer vectors for a wide range of toxic chemicals into organisms, and it is also known that the particle itse

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Custódio, Letícia. "Estratégias de controle de perdas em silagens de cana-de-açúcar." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/11/11139/tde-12112013-110321/.

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O objetivo desse trabalho foi descobrir melhores estratégias de controle de perdas em silagens de cana-de-açúcar, utilizando combinações de aditivos químicos e microbianos ou estratégias de vedações. No primeiro experimento o intuito foi estudar estratégias de controle de clostrídios em silagens de cana-de-açúcar aditivadas com cal virgem. Os tratamentos foram: 1) controle; 2) 1,5% cal virgem (Cal); 3) 1,5% cal virgem + 5×105 ufc/g Lactobacillus plantarum Ma 18/5U (Cal+LP); 4) 1.5% cal virgem + 5×105 ufc/g Lactobacillus buchneri 40788 (Cal+LB); 5) 1,5% cal virgem + 0,07% nitrito de sódio (Cal+

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6

Soualhi, Hamza. "Optimisation de la viscosité des bétons à faible impact environnemental." Thesis, Cergy-Pontoise, 2014. http://www.theses.fr/2014CERG0712.

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Il est possible de modifier la composition des bétons utilisés dans le domaine de la construction pour réduire sensiblement le dégagement de CO2 associé à leur fabrication. Ceci est obtenu en réduisant significativement la quantité de clinker et en incorporant des matériaux de substitution appelés additions. Elles sont généralement moins réactives et demandent, pour maintenir un niveau acceptable de performances mécaniques et de durabilité, une réduction importante du dosage en eau. C'est le cas des bétons à faible impact environnemental. L'utilisation de superplastifiant dans ces bétons perme

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7

Kuchnier, Caroline Nogueira 1983. "Estudo do efeito de aditivo extensor de cadeia multifuncional em blendas de PLA/PBAT." [s.n.], 2014. http://repositorio.unicamp.br/jspui/handle/REPOSIP/266107.

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Orientador: Ana Rita Morales<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Química<br>Made available in DSpace on 2018-08-25T08:54:32Z (GMT). No. of bitstreams: 1 Kuchnier_CarolineNogueira_M.pdf: 6599109 bytes, checksum: 59b6eb5172349da253716bfd2081593a (MD5) Previous issue date: 2014<br>Resumo: O poli(ácido lático), PLA, é um polímero biodegradável muito promissor para aplicações industriais e médicas. Contudo, algumas de suas características, como fragilidade à temperatura ambiente limitam sua potencial utilização e restringem sua degradação às cond

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8

Khodyrieva, Veronika. "Polyéthylène et additifs : composition du plastique, préparation, broyage et impact sur la santé et l'environnement." Electronic Thesis or Diss., Université Côte d'Azur, 2025. http://www.theses.fr/2025COAZ5020.

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Les plastiques sont une composante essentielle de la société moderne, mais leur utilisation généralisée soulève des préoccupations concernant la contamination environnementale et les risques pour la santé humaine. Alors que de nombreuses recherches se sont concentrées sur la formation et la dégradation des microplastiques, peu d'attention a été accordée à la migration des additifs plastiques dans les systèmes biologiques. Cette thèse étudie la préparation et la caractérisation des microplastiques de polyéthylène contenant des additifs industriels, leur impact sur les propriétés physico-chimiqu

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9

HoaÌ€ng, Eric MiÌnh. "Additives interactions in the thermo-oxidative degradation of metallocene polyethylene." Thesis, Manchester Metropolitan University, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.289422.

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During the 1990's the development of metallocene catalysts has made a dramatic impact on the polyethylene industry. A large amount of work can be found in the literature regarding the degradation and stabilisation of conventional polyethylenes. However, very few studies have been devoted to these novel metallocene polymers. The first part of this thesis deals with the thermo-oxidative degradation of various metallocene polyethylenes (mPE's) in the solid state (oven ageing at 90°C in air) and the melt state (via mastication in air in a Brabender® mixer). For each mPE, essentially one characteri

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Ogbobe, Okoro. "Dispersion of additive masterbatches in polyolefin plastics." Thesis, Loughborough University, 1985. https://dspace.lboro.ac.uk/2134/15384.

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There has been a growing trend in recent years for polymer product manufacturers to use natural polymer and additive masterbatches instead of premixed compounds. For both polymer converters and polymer manufacturers, masterbatching makes economic sense. For the converter, the advantage is in the ability to buy and store in bulk a small number of base polymers which may be modified according to the dictates of the order book. This prevents the need to maintain an inventory of a large number of special compounds. Masterbatch base is very often low molecular weight polyethylene or some suitable l

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11

Armstrong, Kenneth Mark. "Catalytic synthesis of organophosphate plastics additives from white phosphorus." Thesis, University of St Andrews, 2011. http://hdl.handle.net/10023/2587.

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Triaryl phosphates were synthesized from white phosphorus and phenols in aerobic conditions and in the presence of iron catalysts and iodine. Full conversion to phosphates was achieved without the use of chlorine or chlorinated solvents, and the reactions do not produce acid waste. Triphenyl phosphate, tritolyl phosphate and tris(2,4-di-tert-butyl)phenyl phosphate were synthesized by this method with 100% conversion from P₄. Various iron(III) diketonates were used to catalyse the conversion. Mechanistic studies showed the reaction to proceed via the formation of phosphorus triiodide (PI₃), the

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Mulcahy, Ciara(Ciara Renee). "Analysis of patent data for flame-retardant plastics additives." Thesis, Massachusetts Institute of Technology, 2020. https://hdl.handle.net/1721.1/131011.

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Thesis: S.B., Massachusetts Institute of Technology, Department of Materials Science and Engineering, May, 2020<br>Cataloged from the official PDF version of thesis.<br>Includes bibliographical references (pages 33-35).<br>Plastics are commercially produced by selecting a polymer resin and incorporating chemical additives to affect specific mechanical, chemical or aesthetic properties of the plastic products. The number of possible combinations of polymers and additives yields an enormous engineering space to meet the design requirements of the many applications of plastic materials. However,

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13

Börno, Fabian. "Analyse von Kunststoffadditiven mittels Laserablation gekoppelt mit induktiv gekoppelter Plasma Massenspektrometrie." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät, 2016. http://dx.doi.org/10.18452/17679.

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Die Laserablation gekoppelt mit der Massenspektrometrie mit induktiv gekoppeltem Plasma ist eine vielversprechende direkte Feststofftechnik, die sich jedoch bei der Analyse von Kunststoffen wegen des Mangels an matrixangepassten zertifizierten Referenzmaterialien nicht durchsetzen konnte. Vorherige Arbeiten belegen polymerabhängige Abtragsraten. Das oft als interner Standard verwendete Intensitätssignal des Kohlenstoffisotopes 13C zur Korrektur dieser Unterschiede wird in der Literatur kritisch diskutiert. In dieser Arbeit als ein Teil des BMBF-geförderten MaxLaP-Projektes wurden matrixangepas

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14

Paul, Nadine. "Entwicklung chromatographischer und spektroskopischer Screeningmethoden zur Bestimmung der Migration aus Lebensmittelverpackungen." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-61685.

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Neben der Sicherheit für Lebensmittel stehen auch immer mehr die Lebensmittelverpackungen im Fokus der Öffentlichkeit. Der Übergang von Stoffen aus der Verpackung in das Lebensmittel ist unerwünscht und gesetzlich reglementiert. Um den Verbraucherschutz zu gewährleisten, müssen Grenzwerte und gesetzliche Anforderungen eingehalten werden. Der Übergang von rechtlich geregelten und nicht geregelten Substanzen muss überprüft werden, was eine analytische Herausforderung darstellt. Die Untersuchung der migrierenden stickstoffhaltigen Substanzen aus Doseninnenbeschichtungen mittels eines Screenings a

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15

Jordan, Michael Girdis. "Additive Manufacturing of Recycled Macadamia Nutshell – Polymer Composites." Thesis, University of Sydney, 2020. https://hdl.handle.net/2123/22707.

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This thesis examines the feasibility of using recycled macadamia nutshell to produce polymer composites via additive manufacturing. Macadamia nutshell powder is combined with the polymer Acrylonitrile Butadiene Styrene (ABS) and a binding agent to produce a filament to be used in Fused Deposition Modelling (FDM). The composites fabricated via this technique are subjected to a series of tests aimed at determining mechanical properties of the composites and their suitability in outdoor structural applications. Scanning Electron Microscopy (SEM) is used to characterise the microstructure of the c

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16

KHAN, FAHAD AHMAD. "Developing Robot assisted Plastic 3D Printing Platform." Thesis, KTH, Skolan för industriell teknik och management (ITM), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-295472.

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This project was initiated by Dr. Sasan Dadbaksh upon listening to the requirements I presented for my master thesis. My requirements were to do a master thesis project in the field of additive manufacturing specifically fused deposition modeling that should not only involve the research work but should also present an opportunity to develop hardware and should involve experimental testing. Then Sasan came up with the idea of developing a system capable to perform 3D printing with the extruder fixed in one position and the motion required for 3D printing will be provided by the robotic arm. Th

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17

Demir, Hasan Ülkü Semra. "Synergistic effect of natural zeolites on flame retardant additives/." [s.l.]: [s.n.], 2004. http://library.iyte.edu.tr/tezler/master/kimyamuh/T000514.rar.

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18

Griffiths, Robert Joseph. "Dynamic and Post-Dynamic Microstructure Evolution in Additive Friction Stir Deposition." Diss., Virginia Tech, 2021. http://hdl.handle.net/10919/104664.

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Metal additive manufacturing stands poised to disrupt multiple industries with high material use efficiency and complex part production capabilities, however many technologies deposit material with sub-optimal properties, limiting their use. This decrease in performance largely stems from porosity laden parts, and asymmetric solidification-based microstructures. Solid-state additive manufacturing techniques bypass these flaws, using deformation and diffusion phenomena to bond material together layer by layer. Among these techniques, Additive Friction Stir Deposition (AFSD), stands out as uniq

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19

Peña, del Olmo Magali Noemi. "Additive manufacturing of non plastic porcelain material by direct writing and freeze casting." Thesis, De Montfort University, 2011. http://hdl.handle.net/2086/5620.

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Two direct consolidation methods usually used for advanced ceramics have been combined in this project in order to develop a novel fabrication route for traditional ceramics. Specifically the method used is based on the Additive Manufacturing extrusion process using direct writing of high solid loading ceramic pastes and then freeze-casting to solidify the deposited material. This novel fabrication method, for which a patent has been granted, has been christened “Direct Writing Freeze-Casting” (DWFC). Although the DWFC process is the subject of investigation by other researchers for a range of

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20

Issart, Ambre. "Potentiel d'antioxydants naturels pour la stabilisation de polymères pour emballages alimentaires et le développement de méthodes pour évaluer leur migration." Thesis, Pau, 2019. http://www.theses.fr/2019PAUU3019.

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Les emballages plastique sont tristement connus pour la pollution accrue qu’ils entrainent. Les effets directs sur l’homme sont principalement dus à la migration de composés depuis le plastique vers les aliments qu’il contient. Ces composés ont des origines diverses : additifs, impuretés, produits de dégradations, réactions non contrôlées… A défaut de savoir arrêter cette migration, nous avons choisi d’en tirer profit grâce à de nouveaux matériaux, appelés matériaux actifs. Ces derniers ont pour objectifs de prolonger la durée de vie des aliments grâce à une migration dite « positive ». L’util

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Bailey, R. "The mechanical properties of a thermoplastic with glass-fibre and rubber additions." Thesis, University of Surrey, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372530.

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Kilinc, Mert. "Production And Characterization Of Boron-based Additives And The Effect Of Flame Retardant Additives On Pet-based Composites." Phd thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/3/12610635/index.pdf.

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For the aim of production of poly(ethylene terephthalate), PET based flame retardant composites<br>boron based flame retardant additives, 3.5 mole hydrated zinc borate and boron phosphate were synthesized. Zinc borate was synthesized with the reaction of boric acid and zinc oxide in both laboratory and pilot scale reactors. Effects of reaction parameters on kinetics of reaction and final product particle size were evaluated. Boron phosphate was synthesized via dry, wet and microwave methods. In addition to the synthesized flame retardant additives, several non-halogenated flame retardant addit

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Hoover, Luke Daniel. "Large Strain Plastic Deformation of Traditionally Processed and Additively Manufactured Aerospace Metals." University of Dayton / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1627570139729633.

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Mai, John. "Aesthetic, Surface Form and Mechanical Performance of 3D Printed Wood-Plastic Composites." Thesis, The University of Sydney, 2021. https://hdl.handle.net/2123/24856.

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Fused filament fabrication (FFF) is an additive manufacturing technology that has been developed into a flexible method of creating a large variety of objects from a digital model. While desktop 3D FFF printers are commonly used to create small-scale, horizontally layered objects that have a homogenous appearance, large-scale complex formations with an aesthetic appearance are far more challenging to produce. This has limited the applications of products made by FFF to mainly architectural models and small-scale structural components. The aim of this work is to expand the technology to manufac

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FIORENTINI, CECILIA. "Sviluppo di nuove plastiche a base biologica per il settore dell'imballaggio alimentare." Doctoral thesis, Università Cattolica del Sacro Cuore, 2022. http://hdl.handle.net/10280/115281.

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In questa tesi di dottorato sono state esplorate diverse strategie per produrre industrialmente nuove miscele di bio-plastiche a base di PLA-PHB con migliori caratteristiche di sostenibilità, con l’impiego di PHB derivato da bucce di patate e nano-additivi di cellulosa e chitina derivati da sottoprodotti (quali paglia di grano e gusci di gamberi). Da queste miscele sono stati ottenuti dei film che sono stati testati anche per la compatibilità al contatto con alimenti e sono risultati in linea con il regolamento EU 10/2011 per alcune specifiche applicazioni alimentari. Seguendo le attuali innov

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ROVERA, CESARE. "REINFORCED PLASTICS AND BIOPLASTICS USING ADDED VALUE ADDITIVES EXTRACTED FROM LIGNOCELLULOSIC AGRO-WASTE FEEDSTOCKS." Doctoral thesis, Università degli Studi di Milano, 2022. http://hdl.handle.net/2434/912623.

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This PhD thesis dealt with the extraction of cellulose and cellulose nanocrystals (CNCs) from three different lignocellulosic agro-waste feedstocks, that is, corncob, giant cane cut-up and garlic stalk through a customized and standardized chemical procedure. In particular, for giant cane cut-up original biomass, a process optimization was performed aimed both to reduce the impact of the usage of organic solvents and to make the extractive conditions more ‘environmental-friendly’ in both cellulose and CNCs extractions. Moreover, the extracted cellulose and CNCs from giant cane cut-up were subs

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Borille, Anderson Vicente. "Decision support method to apply Additive Manufacturing Technologies for plastic components in the aircraft industry." Instituto Tecnológico de Aeronáutica, 2009. http://www.bd.bibl.ita.br/tde_busca/arquivo.php?codArquivo=1916.

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Additive Manufacturing Technologies (AMT) are a collection of manufacturing processes driven by CAD data to produce physical models and parts by means of additive techniques. They are based on a layer-by-layer material consolidation process instead of the traditional methods. Due to machine and material developments, such processes may be used to produce final products, not only prototypes. The use of AMT to produce end-use parts is known as Rapid Manufacturing (RM). The main advantages AMT are related to the ability to build geometrically complex shapes without tooling and with high process a

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Schaefer, Carolyn (Carolyn E. ). "Irradiated recycled plastic as a concrete additive for improved chemo-mechanical properties in hardened cement pastes." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/114051.

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Thesis: S.B., Massachusetts Institute of Technology, Department of Nuclear Science and Engineering, 2017.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Page 37 blank. Cataloged from student-submitted PDF version of thesis.<br>Includes bibliographical references (pages 33-36).<br>Portland cement based concrete production contributes heavily to greenhouse gas emissions. Thus a need exists for the development of durable and sustainable concrete with a lower carbon footprint. This can be achi

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PETERSON, ERIC JOHN. "Additive Manufacturing for Nautical Design An Automated Approach to Marine Manufacturing." Doctoral thesis, Università degli studi di Genova, 2022. https://hdl.handle.net/11567/1101013.

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How can additive manufacturing (AM) technology be applied to automate the production of small marine vessels? For the past 50 years small (below 40 meters) marine vessel manufacturing has been dominated by moulded fiber-reinforced plastics (FRP). There are several shortcomings to this manufacturing method that affect both the formal outcome and the manufacturing process of boats built in FRP: 1) manufacturing requires the use of expensive moulds, 2) formal geometric freedom is limited by moulds which reduce the potential for customization, and 3) special assemblies and structural reinforcement

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Kim, Sangho. "Comparative Life Cycle Assessments of Conventional Products and 3D-Printed Wood-Plastic Composite Alternatives." Thesis, KTH, Materialvetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-287737.

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As additive manufacturing gains market potential as a mainstream process in various sectors of industry, there is a growing need for addressing environmental aspects of this technology and the materials associated with it. In this master thesis, comparative life cycle assessments (LCAs) from cradle to grave between the conventional products and 3D-printed alternatives made of wood-plastic composite (WPC) were conducted based on the ISO 14044:2006 standard. Environmental impacts of each product were quantified for 10 impact categories. The goal of the LCAs was to determine whether the use of th

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Fumelli, Giovanni. "Valutazione primaria degli impatti ambientali nel processo Arburg Plastic Freeforming." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/20773/.

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Il crescente impiego di tecnologie inerenti al campo dell’additive manufacturing nel settore della produzione industriale necessita di testimonianze scientifiche su quelli che possono essere gli impatti ambientali connessi all’utilizzo di questo tipo di processi. Questo documento si propone di analizzare attraverso lo strumento di Life Cycle Assessment (LCA) la tecnologia additiva Arburg Plastic Freeforming (APF) con un approccio del tipo “Craddle to Gate”. Tale studio vuole fornire un modello di riferimento in grado di valutare gli impatti ambientali legati ad una lavorazione additiva che fo

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Krehl, Valentin. "PLASTIC ADDITIVE MANUFACTURING AND ITS POTENTIAL EFFECTS ON A SUPPLY CHAIN : A case study concerning selection of beneficial parts for additive manufacturing through utilizing a methodological part evaluation framework." Thesis, KTH, Industriell produktion, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-226329.

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Recently additive manufacturing (AM) is rapidly growing and evolving due to the advancements made in speed, quality, resolution and performance. Consequently, AM is starting to become, beyond prototyping, increasingly important for the manufacturing of end-use parts. Several successful case studies are reported and companies are starting to investigate in the opportunities of using AM for production processes and supply chain integrations. The purpose of this research is to evaluate the potential of using AM for manufacturing plastic end-use parts in a supply chain. Different AM technologies

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Lott, Joseph Robert. "Design, Synthesis and Incorporation of Functional Additives into Multilayered Polymer Films." Case Western Reserve University School of Graduate Studies / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=case1295673932.

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Ting, Huang, and Nordqvist Daniel. "Design and manufacturing of SLM printed tooling for plastic injection molding." Thesis, Jönköping University, Tekniska Högskolan, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-54170.

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The thesis work is to show that the use of SLM (Additive Manufacturing) compared with the traditional process to make injection molds will have advantages in design, especially in waterways. This thesis work gives seven different versions of design applied to the SLM method to analyze and compare them in Solidworks® and Moldflow® to figure out what design is suitable for the SLM method. Through analysis of different versions, the finding of this thesis work is that the conformal waterway of design and lighter but stead structure in the SLM method causes the SLM molds' cooling performance to b

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Stellmar, Justin. "Predicting the Deformation of 3D Printed ABS Plastic Using Machine Learning Regressions." Youngstown State University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1587462911261523.

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Bäckman, Tobias. "Utredning om konstruktion och beräkning för additiv tillverkning - Markforged." Thesis, Mälardalens högskola, Innovation och produktrealisering, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-40172.

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The following thesis work was performed by Tobias Bäckman between 2018-01-15 – 2018-06-01 on behalf of Deva Mecaneyes. Deva Mecaneyes had identified a need and a possible application area for additive manufacturing based on the Markforged Mark Two 3D-printer which they had purchased. However, many question marks remained regarding how the materials from the printer would behave. How to design against this manufacturing method and which applications that could be beneficial for the company. At the start of the project it was identified that Deva Mecaneyes main limitations for not implementing 3

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Edmonds, Hannah. "Interlaminar bonding in ultrasonic consolidation." Thesis, Loughborough University, 2012. https://dspace.lboro.ac.uk/2134/10999.

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Ultrasonic Consolidation (UC) is a solid state additive manufacturing process which fabricates three-dimensional objects by ultrasonically joining metal foils together, layer-bylayer, to form a solid part. A wide range of materials can be used to fabricate parts by UC and products with complex internal geometry can be generated by shaping the crosssection throughout the build using Computer Numerically Controlled (CNC) milling. As a result of its ability to embed various secondary materials and fibres in metal matrices, UC has emerged as a potential method of fabricating multi-functional mater

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Bouscher, Robert F. "Advancements in Powder Coating Processing and in Real-time Film Formation Analysis of Thermoset Coatings." University of Akron / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=akron1627566578541715.

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Sojiphan, Kittichai. "Effects of Very High Power Ultrasonic Additive Manufacturing Process Parameters on Hardness, Microstructure, and Texture of Aluminum 3003-H18 Alloy." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1418667794.

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Ковба, Анастасія Миколаївна. "Розроблення екструдера для модернізації установки виробництва полімерних гранул". Master's thesis, КПІ ім. Ігоря Сікорського, 2019. https://ela.kpi.ua/handle/123456789/31552.

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Мета магістерської дисертації – проектування каскадного дисково- шестеренного екструдера для установки виробництва полімерних гранул. Записка містить опис технологічного процесу, вибір типу апарату, їх місце в технологічній схемі, технічну характеристику апаратів, обґрунтування вибору конструкцій апаратів, що проектуються і принцип дії їх основних складальних одиниць та деталей, порівняння основних показників розробленої конструкції апаратів з аналогами, патентне дослідження конструкцій апаратів. Наведено заходи, щодо охорони праці, рекомендації з монтажу та експлуатації. Проведено мод

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Pinto, Maria Clara Cavalini 1987. "Avaliação das propriedades do gesso reciclado contendo aditivos." [s.n.], 2014. http://repositorio.unicamp.br/jspui/handle/REPOSIP/258271.

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Orientador: Gladis Camarini<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Civil, Arquitetura e Urbanismo<br>Made available in DSpace on 2018-08-27T20:22:32Z (GMT). No. of bitstreams: 1 Pinto_MariaClaraCavalini_M.pdf: 8053440 bytes, checksum: bbe81de24c0023c7d27c30c6e2aeb3c0 (MD5) Previous issue date: 2014<br>Resumo: As novas leis ambientais vem forçando a sociedade e empresas a mudar suas atitudes com relação à geração e destino dos resíduos. A produção indiscriminada desses rejeitos e a deposição incorreta do material vem causando impactos ambientais

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Hermabessiere, Ludovic. "Les microplastiques et leurs additifs dans les produits de la pêche : développements méthodologiques et prévalence." Thesis, Littoral, 2018. http://www.theses.fr/2018DUNK0492/document.

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L'augmentation de la production de matière plastique depuis les années 1950 combinée à une mauvaise gestion des déchets plastiques ainsi qu'aux mauvais comportements des citoyens conduit à la contamination des écosystèmes terrestres comme marins. L'ingestion par des organismes marins de particules plastiques mesurant moins de 5 mm, appelées microplastiques, a été décrite. L'objectif de ces travaux de thèse était d'évaluer le danger "microplastique" pour le consommateur de produits de la pêche. Afin de répondre à cet objectif, la sélection et la caractérisation d'une méthode permettant de digér

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Monteiro, Aline Gomes de Sousa. "Desenvolvimento de aditivo plastificante e retardador de pega para gesso a partir da mucilagem da palma forrageira." Universidade Federal da Paraíba, 2015. http://tede.biblioteca.ufpb.br:8080/handle/tede/9103.

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Submitted by Viviane Lima da Cunha (viviane@biblioteca.ufpb.br) on 2017-07-18T10:57:09Z No. of bitstreams: 1 arquivototal.pdf: 4564274 bytes, checksum: 51892e7a23a0b2af99ba8810b5e40ecf (MD5)<br>Made available in DSpace on 2017-07-18T10:57:09Z (GMT). No. of bitstreams: 1 arquivototal.pdf: 4564274 bytes, checksum: 51892e7a23a0b2af99ba8810b5e40ecf (MD5) Previous issue date: 2015-09-30<br>The use of gypsum in the building industry has been growing since 1990. The current plaster coating quick and easy application and is being widely used in construction due to its low cost. However, implementati

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Sreedhar, Aldric, and C. L. Kaushik Gupta. "Pre-study on the use of additive manufacturing to produce low volume complex parts and its environmental sustainability." Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-52800.

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With the rapid increase in demand for more high-value customized products and a more sustainable approach to manufacturing, companies are focusing on being more flexible while also trying to minimize environmental impact. As it is not possible to meet these current demands using traditional manufacturing techniques, manufacturing industries are searching for better manufacturing alternatives to address these issues in order to stay competitive. In this thesis, the two issues of manufacturing complex, low volume parts and environmental sustainability were investigated with the use of the additi

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NANNI, ALESSANDRO. "Progettazioni di plastiche derivanti dal vino: scarti vitivinicoli come substrato di sintesi, additivi e fillers per differenti polimeri e biopolimeri." Doctoral thesis, Università degli studi di Modena e Reggio Emilia, 2020. http://hdl.handle.net/11380/1200770.

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Negli ultimi decenni, a causa della sempre maggiore e più diffusa preoccupazione ambientale, l’industria e la ricerca scientifica si sono concentrati sullo sviluppo di nuovi processi, materiali e sistemi meno impattanti. Così, nel mondo della plastica, i polimeri da fonte rinnovabile (bio-based) e/o quelli biodegradabili hanno guadagnato una grande attenzione in quanto promettenti soluzioni per la risoluzione o riduzione della dipendenza dal petrolio e/o dell’inquinamento della plastica. Tuttavia questi nuovi polimeri naturali coprono ad oggi solo ristrette porzioni di mercato in quanto più co

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Mittag, Nadine. "Kombination von instrumentell-analytischen Verfahren und Biotests zur Untersuchung von Migraten aus Lebensmittelverpackungen." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2009. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-25042.

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An Lebensmittelverpackungen wird heutzutage durch die zunehmende Nachfrage nach einfach zubereitbaren Fertigprodukten eine Vielzahl von Anforderungen gestellt. Diese Verpackungen sollen das Lebensmittel zum Beispiel vor Licht und Mikroorganismen schützen, weiterhin sollen sie verformbar, temperaturbeständig, mechanisch und chemisch belastbar sein. Sie sollen das Lebensmittel vor Aromaverlust bewahren, einen Gasaustausch ermöglichen und einen konstanten Feuchtigkeitshaushalt erhalten. Für den Verbraucher dagegen sind hauptsächlich das optische Erscheinungsbild und die Qualität des verpackten Le

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Kleinfehn, Alex Patrick. "Scale-Up of Modifiable Poly(propylene fumarate) and Surface Functionalization of Additive Manufactured Scaffolds for Bone Tissue Regeneration." University of Akron / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=akron1562679460809562.

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Engkvist, Gustav. "Investigation of microstructure and mechanical properties of 3D printed Nylon." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-66304.

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This thesis presents a multiscale investigation and characterization of additive manufactured Polyamide material using fused deposition modelling technique. Manufacturing was performed using Markforgeds – Mark one 3D printer. A multiscale investigation dedicated to minimizing the effect of shape distortion during 3D printing are presented, focusing on both molecular alignment in microstructure and implementing internal structures in mesostructure. Characterization on samples investigating microstructure was performed with coefficient of linear thermal expansion measurement and 3-point bending

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Moammer, A. A. "Thermal management of moulds and dies : a contribution to improved design and manufacture of tooling for injection moulding." Thesis, Stellenbosch : University of Stellenbosch, 2011. http://hdl.handle.net/10019.1/6652.

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Thesis (PhD (Industrial Engineering))--University of Stellenbosch, 2011.<br>ENGLISH ABSTRACT: Injection moulding of polymer components is subject to ever increasing demands for improved part quality and production rate. It is widely recognised that the mould cooling strategy employed is crucial to achieving these goals. A brief overview of injection moulding units and different types of injection moulds is given. The modern Additive Manufacturing (AM) technology for processing metal powders such as Direct Metal Laser Sintering (DMLS) and Selective Laser Melting (SLM) offers almost full f

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Bardi, Marcelo Augusto Gonçalves. "Avaliação do impacto ambiental gerado por tintas gráficas curadas por radiação ultravioleta ou feixe de elétrons em materiais para embalagens plásticas convencionais ou biodegradáveis pós-consumo." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/85/85131/tde-17032015-101014/.

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O alto nível de poluição gerado pelo descarte inadequado de materiais poliméricos vem motivando pesquisas por sistemas e técnicas ambientalmente corretos, tais como a aplicação de polímeros biodegradáveis e a substituição dos sistemas de pintura à base de solventes por aqueles com alto teor de sólidos, à base de água ou, praticamente isentos de compostos orgânicos voláteis (VOCs) e curáveis por radiação. Todavia, os revestimentos poliméricos curados são insolúveis e infusíveis, aumentando o grau de complexidade do seu reprocessamento, da sua reciclagem e da degradação desejável. Assim, este tr

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