Temat: plastics - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Comparative analysis of fuels derived from pe plastic waste with a mixture of plastic recycling waste of codes: 1, 2, 4, 5, 6 and 7 based on low-temperature pyrolysis
Autorzy:: Lesnau, Anna
Tyliszczak, Mirosław
Tematy:: pyrolysis
plastics
waste; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/247043.pdf Link otwiera się w nowym oknie
Opis:: Thanks to their numerous advantages, plastics are becoming more and more widely used in all branches of industry. The quantities of products, their packaging and, consequently, the amount of synthetic polymer waste are steadily increasing, what poses a high risk to the environment due to their long decomposition time. To reduce waste production is practically impossible, therefore it is very important to constantly implement new and improve existing methods of waste treatment. The following article presents one of the alternative methods for synthetic polymer waste treatment, which is low-temperature pyrolysis. Two pyrolysis processes were carried out. During the first experiment a polyethylene plastic material was used, in the second experiment a mixture of typical household recycling waste of codes 1, 2, 4, 5, 6, and 7 were tested. During the thermal processing, the input material undergoes a chemical transformation due to breaking of long hydrocarbon chains. At the same time, high-energy density products, such as petroleum products and gas, are produced. The main advantage of the presented method is that it allows reducing preliminary technological processes to a minimum and it is easily automated, as it reduces the process to one compact installation. The reduction of the amount of stored waste and the recovery of petroleum derivatives, are additional advantages of pyrolysis implementation. That, in consequence allows reducing consumption of fossil fuel resources.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Effect of Composite Material Fixing on Hole Accuracy and Defects During Drilling
Autorzy:: Ciecieląg, Krzysztof
Tematy:: drilling
delamination
carbon fiber reinforced plastics
glass fiber-reinforced plastics
feed force; Pokaż więcej
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Powiązania:: https://bibliotekanauki.pl/articles/2123286.pdf Link otwiera się w nowym oknie
Opis:: This study investigates the effect of composite material stiffness on the accuracy of drilled holes and delamination in the drilling process. Two types of composite materials were tested: glass fiber reinforced plastic (GFRP) and carbon fiber reinforced plastic (CFRP). The drilling process was performed using dedicated drill bits. Samples were clamped in a vice of the Avia-VMC 800 HS vertical machining center. Drilling parameters were maintained constant but unsupported element length was changed. The unsupported element length was defined as an unsupported distance between the drilled hole axis and the sample attachment location. The maximum feed force Ff was determined in the experiments. The accuracy of drilled holes was estimated by optical microscopy. Diameters of the drilled holes were measured. Results made it possible to determine the recommended unsupported element length at which the hole dimensions were within the dimensional tolerance. The study showed a clear decrease in the drilled hole quality and a significant increase in the feed force, especially in the area of tool exit from the workpiece. In addition, the number of delaminated fibers increased with unsupported element length was determined in the study.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Optimization of laser cutting conditions of polypropylene and polypropylene with talc
Autorzy:: Cienka, Agnieszka Edyta
Ciecińska, Barbara
Tematy:: laser
material cutting
plastics
polypropylene; Pokaż więcej
Wydawca:: Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
Powiązania:: https://bibliotekanauki.pl/articles/2014127.pdf Link otwiera się w nowym oknie
Opis:: Laser cutting of materials requires the execution of processing tests and the selection of the most favourable variant from the point of view of the adopted criteria of process quality assessment. This paper presents the example of a preparatory process, which shows that cutting polypropylene and polypropylene with 5 mm thick talc is not an easy process of material handling. A CO2 laser was used and by varying the utilized power from the laser and the beam speed relative to the material, cuts of varying quality were obtained. Criteria were also proposed for the selection of the best processing variant. It was concluded that the addition of talc to polypropylene can be a factor facilitating laser cutting of this material.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Impact assessment of the uniformity mixing recycled and virgin polymers on the technical extrusion blow molding efficiency
Autorzy:: Pepliński, K.
Tematy:: technical extrusion blow molding
plastics mixing recyclate
virgin plastics
mixing uniformity
part weight
wall thickness; Pokaż więcej
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Powiązania:: https://bibliotekanauki.pl/articles/2073653.pdf Link otwiera się w nowym oknie
Opis:: Extrusion blow molding of technical products (EBM-TP) is a significant technological polymer manufacturing process ex. for the automotive branch. Implementation of the extrusion blow molding process in an operating arrangement of polymer technology is a component of many technological factors, but also of factors related to feedstock material. The products can be manufacturing with the participation of plastics recyclate. The homogeneity of the recyclate-virgin polymer mixture strongly influences the distribution of spreading the wall thickness of the final products. For this type product wall thickness distribution should be uniform and very close to each other or determined in a specific range of values. Work presents the mixture influence (HDPE recyclate-virgin polymer,) with different characteristics of mixing degree defined as homogeneous and heterogeneous, on the part features (the intake manifold airflow in a motor vehicle) with respect to the weight of the weight and wall thickness in reference required by the customer of the product. Mixtures of HDPE were prepared via a specialized gravimetric mixer, which is directly connected to the feed circuit extruder blow molding. They began to manufacture defined types of test specimen (actual Products of) and their evaluation according to criteria adopted burden of weight and wall thickness.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Reverse logistics processes in plastics supply chains
Autorzy:: Graczyk, M.
Witkowski, K.
Tematy:: logistics
reverse logistics
recovery
plastics; Pokaż więcej
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Powiązania:: https://bibliotekanauki.pl/articles/343800.pdf Link otwiera się w nowym oknie
Opis:: The role of reverse logistics in creating added value for producers of plastics is presented here. The premise is the choice of reverse logistics for plastics on the one hand, considering their versatile applications, such as in the packaging, construction and automotive industries. On the other hand, an extremely important issue is that their production is characterized by high dynamics, has a significant impact on the environment, contributing significantly to the use of the valuable resource that is oil. This paper will focus on the economical and environmental optimization of reverse logistics processes in production enterprises. The presented article is part of a research project on developing application methods for the settlement of environmental-economic support for reverse logistics processes aimed at reducing consumption of energy and raw materials by plastics manufacturers, which ultimately translates into added value in terms of so-called environmental benefits.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Minimal Conditions to Degrade Low Density Polyethylene by Aspergillus terreus and niger
Autorzy:: Sáenz, Melina
Borodulina, Tamara
Diaz, Linda
Banchon, Carlos
Tematy:: Laccase
plastics
polymer
SEM
Czapek; Pokaż więcej
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Powiązania:: https://bibliotekanauki.pl/articles/124967.pdf Link otwiera się w nowym oknie
Opis:: Plastics pollution is a major worldwide concern because there is strong evidence about marine influence on the human trophic chain. Thus, we experimented with the biodegradation of low density polyethylene (LDPE) by A. niger and A. terreus in order to increase the degradation rate without any co-substrate or photothermal treatment. Our contribution is to show how to degrade LDPE under minimum nutritional conditions using both LDPE and sucrose as carbon sources. Up to 30% weight loss was obtained by A. niger and A. terreus which were isolated from an Ecuadorian mangrove. The evidence of cracks and biomass growth on the LDPE surface samples showed the potential of both fungi species to operate under low nutrient concentrations. The outlook of the present work was focused on understanding the fungi survival under minimal conditions.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Assessment of the Energy Potential of Plastics as a Component of ANFO-type Explosives
Autorzy:: Biegańska, Jolanta
Tematy:: energy potential
waste plastics
ANFO; Pokaż więcej
Wydawca:: Politechnika Koszalińska. Wydawnictwo Uczelniane
Powiązania:: https://bibliotekanauki.pl/articles/58907739.pdf Link otwiera się w nowym oknie
Opis:: Many methods have been developed to reduce the environmental impact of plastic waste. New technologies have been developed to make high-temperature utilisation of these wastes possible. A promising method for the unconventional disposal of plastics by detonation was identified. The popular explosive ANFO (Ammonium Nitrate Fuel Oil) is a component mixture of oxidiser (ammonium nitrate) and fuel (diesel fuel). The optimal composition is 94.5% oxidiser and 5.5% fuel – a guarantee of complete and total combustion. Plastics have a chemical composition and oxygen balance similar to fuel oil. It is possible to replace the fuel share in ANFO by adding plastics and using the energy they contain. The amount of energy that can be recovered is high for PE and PP (at the level of 0.6) and PS – 0.5. Using polymers as ANFO components is advantageous for economic reasons – plastic waste will be eliminated during blasting works.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Green minimalistic approach to synthesize chitosan-based durable polymer hydrogel materials for supporting cell growth
Autorzy:: Wieczorek, Piotr
Kamiński, Kamil
Borawska, Klaudia
Pawlik, Justyna
Opis:: In this work, we present an innovative, crosslinker-free method for preparing chitosan-based hydrogel precursors, fully aligned with green chemistry principles and composed of only five non-toxic, readily available reagents. The key novelty lies in the use of glycerin, which, during thermal annealing, evaporates and triggers a surface or bulk chemical transformation of chitosan, depending on its concentration. This process significantly enhances the material’s mechanical properties after swelling—with up to a 35% increase in tensile strength and a notable reduction in water uptake compared to systems containing AMPS-based crosslinkers. FTIR analysis indicates a partial re-acetylation of chitosan, shifting its structure toward that of chitin, which correlates with improved hydrophobicity (as shown by increased contact angles up to 92°) and greater structural integrity. These improvements are particularly pronounced at glycerin concentrations of 10–20%, whereas higher concentrations (50%) result in brittle, non-moldable films. Importantly, preliminary biological tests confirm that the resulting hydrogels are effectively colonized by mammalian cells, making them promising candidates for bioimplant or tissue engineering applications. Surface morphology and compatibility were further assessed via SEM, AFM, and contact angle measurements.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 9.

Tytuł:: Problemy z biodegradacją tworzyw sztucznych w środowisku
Problems with the biodegradation of plastics in the environment
Autorzy:: Stachurek, I.
Tematy:: tworzywa sztuczne
recycling
biodegradacja
plastics
biodegradation; Pokaż więcej
Wydawca:: Wyższa Szkoła Zarządzania Ochroną Pracy w Katowicach
Powiązania:: https://bibliotekanauki.pl/articles/370755.pdf Link otwiera się w nowym oknie
Opis:: W artykule przedstawiono zagadnienia dotyczące produkcji, zastosowania oraz metod recyklingu tworzyw sztucznych. Dużą uwagę poświęcono procesom (bio)degradacji materiałów polimerowych oraz czynnikom warunkującym zajście tego procesu. W pracy przedstawiono opis procesów degradacji wybranych polimerów niebiodegradowalnych i biodegradowalnych. Na podstawie przeglądu literaturowego opisano również techniki eksperymentalne stosowane obecnie w laboratoriach przy określaniu stopnia biodegradacji polimerów i ich kompozytów oraz metody pomiaru stopnia degradacji biologicznej w środowisku naturalnym.
In the article information concerning the production, application and recycling methods of plastics were discussed. Much attention was paid to the processes of (bio)degradation of polymeric materials and the factors affecting the occurrence of this process. The paper presents a description of the degradation of selected polymers, both biodegradable and non biodegradable. Additionally, the article reviewed the experimental techniques used currently in laboratory investigations of biodegradation of polymers and their compositions, and methods for measuring the degree of biodegradation in the environment.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Unveiling environmental governance and political economy dynamics in rural plastic pollution management: a case study of Ogun State, Nigeria
Autorzy:: Oludele, Solaja Mayowa
Samuel, Awobona
Omosat, Osifo Kelly
Tematy:: Environment
Governance
Plastics
Stakeholder
Rural
Nigeria; Pokaż więcej
Wydawca:: Wydawnictwo Adam Marszałek
Powiązania:: https://bibliotekanauki.pl/articles/20434525.pdf Link otwiera się w nowym oknie
Opis:: Plastic pollution has emerged as a significant environmental and public health concern globally, with detrimental effects on ecosystems, human health, and socio-economic development. One way to a safer global environment is encouraging rural communities to manage solid waste and reduce plastic pollution. This study aims to explore the environmental governance and political economy of plastic pollution management in rural communities of Ogun State, Nigeria. By examining the interactions between governance structures, political actors, and socio-economic factors, the study seeks to provide insights into the challenges and opportunities associated with plastic waste management in rural areas. The study employs a mixed-methods approach, combining qualitative and quantitative data collection methods, to obtain comprehensive and detailed findings. The results of the study indicate divergent interests among stakeholders regarding the management of plastic pollution and environmental concerns in rural communities of the Ijebu region in Ogun State, Nigeria. The research emphasizes the importance of supporting community-led environmental initiatives that adhere to established environmental guidelines for effective solid waste management, with particular emphasis on plastic waste, in rural areas of Nigeria.
Dostawca treści:: Biblioteka Nauki

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