Browsing by Subject "polymers"

Now showing 1 - 15 of 15

Access status: Open Access ,
A numerical simulation study of mold filling in the injection molding process
(Wydawnictwa AGH, 2021) Baum, Markus; Anders, Denis
Injection molding can undoubtedly be regarded as one of the most widely used manufacturing processes for polymers (Guevara-Morales & Figueroa-Lopez, 2014). Furthermore, injection molding has found its way into various branches of industry (Fernandez et al., 2018) since it has several essential advantages over other processing techniques in terms of good surface finish, the ability to process complex parts without the need for secondary operations, and low cost for mass production. In order to find optimal process settings, it is necessary to gain a deeper insight into the filling process and the underlying physical phenomena, as well as a thorough understanding of the complex material behavior. In this context, the numerical simulation of the injection molding process is increasingly important. Therefore, the current contribution is dedicated to present a thorough comparative numerical study for the mold filling of an exemplary thin-walled mold geometry, including a realistic non-Newtonian viscosity model for the polymer melt. For the numerical simulation, the authors employ the commercial CFD software packages Cadmould 3D-F and ANSYS CFX. While ANSYS CFX is a well-established CFD software for numerical modelling of multiphysical phenomena, Cadmould 3D-F is a highly specialized and computationally efficient alternative suitable for certain geometric configurations in the context of injection molding. The present study is new in the sense that it demonstrates the equivalence of the considered software packages for the simulation of the injection molding process in thin-walled mold geometries.
Access status: Open Access ,
Badania laboratoryjne nad zastosowaniem nowego kopolimeru kationowo-niejonowego do płuczek HDD
(2009) Wysocki, Sławomir; Bielewicz, Danuta; Wysocka, Marta
One of the most important in HDD technology is a drilling mud with specific properties. In this paper the results of cationic-nonionic copolymer KaCoPoli-3 application in drilling mud are presented. Tested mud characterize with good technological properties, it gives good perspectives of industrial development.
Access status: Open Access ,
Badania laboratoryjne nowo opracowanych beziłowych płuczek kationowo-skrobiowych przeznaczonych do przewiercania skał ilastych
(2007) Wysocki, Sławomir; Bielewicz, Danuta; Wysocka, Marta
In this paper results of investigations of new muds with cationic polymers are presented. Research was conducted in simulted downhole conditions. Test results shown that new cationic-starch based drilling muds have very good technological parameters.
Access status: Open Access ,
Contribution in testing swelling packers behavior
(2009) Matanović, Davorin; Simon, Katarina; Gaurina-Medimurec, Nediljka; Pašić, Borivoje; Malnar, Matija
Effect of polymer swelling that was considered to be a problem, gives today a possibility, to complete wells that are a problem one for conventional packer setting and sealing. Polymers (rubbers) can swell in hydrocarbons or water based fluids as well. Several ways of application have been accepted. Mainly they are connected with open hole and sand screen completions in unconsolidated formations. The ability of changing the volume to more than several hundred percent, can help to avoid packer failure. When defining swelling packer elements it is important to determine their mechanical properties, swelling speed in various fluids, and stability (ageing tests). To implement home made products it was necessary to provide laboratory testing equipment for such purpose. The developed apparatus enables use of different fluids, temperature change up to known reservoir temperature, and pressure differential that element can withstand.
Access status: Open Access ,
Generation of large scale robotic 3D printing trajectories and optimization of the quality of pieces
(Wydawnictwa AGH, 2023) Rosoux, François; Appeldoorn, Henri; Garray, Didier; Beeckman, Eric
Incremental sheet forming is used to form metal sheets on massive dies. However, the waste and time lost due to the machining of dies can be a problem for both companies and the environment. Additive manufacturing is thus a potential alternative to classical machining of dies, but these complex geometries could be challenging for classical layer-by-layer 3D printing techniques. This paper will present an innovative process based on a 3D printing technology using 3-axis systems and a pellet extruder combined with the generation of non-planar trajectories in order to achieve good surface quality. PLA-based parts were realised to evaluate surface quality and mechanical properties. With such a technique, the obtained 3D printed parts were closer to the expected CAD geometries and smoother top surfaces were obtained. These improvements have been made possible through the development of specific post-processors and printing strategies in order to replicate the behaviour of a 3D printer at a larger scale, which is a current challenge in robotic 3D printing.
Access status: Open Access ,
Investigating the content of microplastics and other extraneous particles in Polish bottled water
(Wydawnictwa AGH, 2023) Aleksander-Kwaterczak, Urszula; Gaj, Dominika; Stelmach, Alex; Wróbel, Tomasz P.
Bottled water has enjoyed a global increase in popularity since it is generally perceived to be superior in quality to tap water and necessary when tap water is non-potable. As a result, ensuring that it meets the requisite quality standards is of vital importance. This work aims to examine the content of solid particles, including microplastics, in bottled water available in Polish stores. The second aspect is the preliminary determination of the influence of the water gassing process, together with thermal and light factors, on the content of particles in the water. The number of particles was counted by colour and shape, with the number ranging from 87 to 188 per litre of water, on average, there were 136 $\pm$ 32 particles per litre of water, demonstrating that water from disposable plastic bottles is contaminated with various substances. The difference in the number of particles may be due to the origin of the waters, the processes they were subjected to prior to bottling, the properties of the bottles as packaging, and the conditions and length of storage and transport. Additional Fourier-transform infrared spectroscopy (FT-IR) analysis confirmed that about 75% of the particles were polymers, and 50% of them were plastics. Particularly alarming is the fact that the bottled waters mostly contained microplastic particles (MP) of smaller sizes, the kind which is recognized as being the most dangerous to human health. In the study, most particles were in the form of irregular shapes, which may indicate that they come from the destruction of waste or plastic products. This is also indicated by the domination of colourless particles. More particles were found in waters exposed to high and low temperatures than in waters stored at room temperature, potentially indicating that storage conditions for drinking water are important. Taking into account the results obtained, increasing attention should be paid to the health risks posed by such microplastics and there is a clear need to introduce legal regulations on the matter. The lack of any legal guidelines or unified standards in the field of MP research means that the results are not always representative, and it also makes it difficult to compare the results from different studies.
Access status: Open Access ,
Linear Swelling Test (LST) of clay formation under the influence of newly developed drilling fluids with the addition of cationic polymers
(2015) Wysocki, Sławomir; Wiśniowski, Rafał; Ryznar, Dawid; Gaczoł, Magdalena
This paper shows research of Linear Swelling Test (LST) of shale rocks under the influence of three drilling muds with different cationic polymers. Tested polymers have been synthetized at the Drilling, Oil and Gas Faculty of AGH UST Krakow. Research findings indicate that synthesized polymers as well as developed on its base drilling fluids effectively inhibit hydration and prevent the disintegration of clay formation.
Access status: Restricted ,
Metody ultradźwiękowe w badaniach biomateriałów
(Data obrony: 2010-01-25) Porąbka, Anna
Międzywydziałowa Szkoła Inżynierii Biomedycznej
Access status: Restricted ,
Modyfikowane hydrożele na bazie polimerów naturalnych - otrzymywanie i charakterystyka
(Data obrony: 2020-07-15) Sądej, Michalina
Wydział Inżynierii Materiałowej i Ceramiki
Access status: Open Access ,
New mud for drilling in clay and shale rocks with cationic KAN-001 polymer
(2015) Wysocki, Sławomir; Stec, Maciej; Artym, Rafał
This paper presents laboratory researches on KAN-001 cationic polymer application dedicated for drilling fluids used in drilling through sensitive shale formation and also the formulation of a new mud system for drilling in clayish rocks. Laboratory researches showed the great utility of KAN-001 polymer, synthesized in AGH-UST, for its application in special drilling fluids for shale and clay rocks. A new mud system – Mud-17 – with an addition of KAN-001 polymer, is distinguished by good technological parameters. It is resistant against univalent and divalent salts contamination. Therefore, a new mud system can be salted up to the saturation. Mud-17 is also resistant against high temperature, so it can be used in deep wells.
Access status: Open Access ,
Nowa generacja reagentów przywracających właściwości pojemnościowo-filtracyjne warstw wydobywczych w warunkach powtórnego udostępnienia i rekonstrukcji odwiertu
(2010) Ivankiv, O.O.; Ahmetova, V.M.; Dyvoniak, Ju.I.
At time of the repeated opening of the low-permeable collectors the worsening of their filtrating characteristics takes place. The worsening happens because of negative influence of the solid phase and filtrate of the washing fluid, especially because of polymeric pollution. It was estimated, that quantity of so-called "dry" fields increases during increase of the duration of the effect of the washing fluid over the field. For example, according the results of the tests on wells in Ukraine it was established that if the washing fluid was effecting on the field during was not less than 3 days, the inflow was gained from 50% of the objects; that if the effecting was 4 to 10 days, the inflow was gained from 29% of the objects; and that if the effecting was more than 10 days, the inflow was gained only from 17% of the objects. The conducted laboratory and analytic researches discovered the mechanism of the collector blocking by the polymeric component of the washing fluid. Removal of the polymeric reagents from the pore space is a urgent problem during the recovery of the filtrating characteristics of the fields at the ending of the drilling, as well as after overhaul of the well. At Ukrainian State Geological Institute there were developed and researched two chemical solutions of reagents-oxidizers HV and DT. Their function was cleaning of the pore space during repeated opening of the productive fields and during development. These reagents contribute in destruction of the polymeric connections of the colmatants and their removal from the field. For improving of the effectiveness of the developed reagents by the temperatures from 20 to 100 degrees of Celsius, there were analysed the main polymers used for wells drilling, such as PAA (marking A-1020, A-227), Celpol R, carboxyl-methyl-cellulose, Fin-Fix HL, Duo-vis, Flo-vis, and Xhanthan Gum IV). At the end of the research, the needed temperature conditions were selected, which are needed for their destruction at field conditions. The research on the real samples from oil and gas fields showed that the developed reagents HV and DT have a high level efficiency in recovery of the filtrating characteristics of the sand and carbonate collectors.
Access status: Open Access ,
Polyglycol mud for drilling in clay and shales
(2011) Gąszcz, Krzysztof; Suchar, Mariusz; Wysocki, Sławomir
Drilling a wellbore in formations containing water-sensitive shales can cause many serious technical problems. Especially mud which enable safe drilling in shales and clays formations must be characterized not only by features of standard modern mud, but also has to reduce water adsorption and thus hydration of clays and shales. This paper was prepared so as to present the results of laboratory investigation in which a glycol and ion - polymer fluid based on potassium salt was made. Obtained mud is characterized by high-temperature resistance, good rheological properties, low water loss and resistance to salt ions.
Access status: Open Access ,
Recent Progress in the Recovery and Recycling of Polymers from End-of-Life Silicon PV Modules
(2025) Padhamnath, Pradeep
Wydział Inżynierii Metali i Informatyki Przemysłowej
Solar photovoltaic (PV) technology has emerged as the most preferred source of clean energy generation and has been deployed at a large scale. However, end-of-life management of the PV modules is a critical issue that has garnered the recent attention of lawmakers and researchers alike. Consequently, several researchers are actively developing technology to recycle the end-of-life PV modules. Since silicon PV modules account for more than 90% of the modules deployed globally, most of these efforts are focused on recycling crystalline silicon PV modules. Researchers have primarily focused on recovering pure silver from the contacts and pure Si from the solar cells. However, to ensure complete recyclability of such panels, the different polymers used in these modules must also be recycled. This review addresses the issue of recycling the polymers from end-of-life c-Si modules. Scopus and Google Scholar were used to search for the relevant literature. This review presents the current state-of-the-art technology related to polymer recycling found in the PV modules, the challenges encountered in their recycling, and the outlook. While research on the recycling of polymers has progressed in the last few decades, the instances of their applications in the recycling of polymers from PV panels are rarely reported in the literature. In this work, certain technical pathways, which can be employed to recycled polymers obtained from end-of-life PV panels, are presented. Recycling the polymers from the end-of-life silicon PV modules is crucial for improving the sustainability of solar PV technology.
Access status: Open Access ,
Reconstruction fluid with new PT-86 polymer
(2016) Wysocki, Sławomir; Stryczek, Stanisław; Gonet, Andrzej; Gubała, Przemysław; Gaczoł, Magdalena
While reconstructing partially exploited boreholes located in south-eastern part of Poland there were several issues. Standard procedures were not efficient enough to fulfil the requirements for fluid to work properly. This enforced investor to turn to the Faculty of Drilling, Oil and Gas AGH UST Krakow for assistance in developing special formula for working fluid. Major requirements set for reconstruction fluid were to: inhibit hydration of loam rocks, reduce corrosion of casing and tubing and decrease filtrate loss which maintained at a high level. Therefore, the Faculty of Drilling, Oil and Gas AGH UST Krakow developed and compared various reconstruction fluids' formulas to eliminate encountered complications. The article also concentrates on studying the samples collected from the borehole and presents conclusions based on laboratory tests. Analyses of the research results expose best working solution for eliminating the issues that came across during reconstruction of the borehole.
Access status: Open Access ,
Studies on the impact of ionic degree of copolymer poly(AAm-co-AMPSA) to bentonite suspension parameters
(2016) Wysocki, Sławomir; Klima, Kinga; Podborska, Agnieszka
The article presents results of the laboratory studies on the impact of ionic degree of copolymer poly (AAm- -co-AMPSA) to technological parameters of bentonite suspension. Rheological properties of bentonite suspension, lubricity, filtration and LST were examined.