Article
Polymer Science
Bruno Vergnes
Summary: This paper presents two methods for calculating the average shear rate encountered by material flowing along the screw elements of a corotating twin-screw extruder. A comparison is made between approximate and exact methods, showing the importance of taking into account shear component, especially in left-handed screw elements.
Article
Engineering, Chemical
Hannes Bauer, Josip Matic, Johannes Khinast
Summary: This study used Smoothed Particle Hydrodynamics simulations to investigate the pressure build-up, power consumption, and mixing behavior of various extruder elements in pharmaceutical extrusion equipment. A comprehensive parameter catalogue was computed to study the performance of all elements under different operating conditions, and novel process maps supporting the optimization of process zone length were presented.
CHEMICAL ENGINEERING SCIENCE
(2021)
Article
Engineering, Chemical
Gregory A. Campbell, Mark D. Wetzel, Paul Andersen, Joseph Golba
Summary: This paper focuses on the conveying of pellets in a twin screw extruder, and discusses the mechanisms of pellet conveying, heating, and pressure generation. The model is validated with experiments on different types of polymers. The effects of throughput and rotation speed on the pressure profiles are examined.
POLYMER ENGINEERING AND SCIENCE
(2023)
Article
Polymer Science
Valentina Brunella, Veronica Aresti, Umberto Romagnolli, Bruno Muscato, Marco Girotto, Paola Rizzi, Maria Paola Luda
Summary: In this study, a comprehensive analysis was conducted on the thermo-mechanical devulcanization of post-industrial EPDM rubber using a co-rotating twin-screw extruder. The results showed that higher thermal profile and screw speed led to higher devulcanization percentage, and the screw profile composition also affected the efficiency of devulcanization.
Article
Engineering, Chemical
Jian Wang, Xiaofeng Hu, Fangke Liu, Zhibin Long, Mingwang Shao
Summary: In this study, a twin-screw extruder with an ultra-large length-to-diameter (L/D) ratio was developed and applied in the gel-spinning process of UHMWPE. The results showed that the ultra-large L/D ratio could improve the tensile properties and crystallinity of the gel fibers, indicating its great potential for enhancing the disentanglement of molecular chains.
POLYMER ENGINEERING AND SCIENCE
(2022)
Article
Engineering, Chemical
Gregory A. Campbell, Mark D. Wetzel, Paul Andersen, Joseph Golba
Summary: This paper presents a novel melting model for the kneading block melting zone in co-rotating, fully intermeshing twin screw extruders. The model includes multiple melting mechanisms such as friction heating, pellet compression, energy diffusion, and viscous dissipation. It is validated using extrusion measurements and visualizations with low density polyethylene. The study helps to elucidate the mechanisms during melting in twin screw extruders.
POLYMER ENGINEERING AND SCIENCE
(2023)
Article
Engineering, Chemical
Hannes Bauer, Johannes Khinast
Summary: Twin-screw extruders are known for their good mixing performance, but the actual mixing mechanism remains largely unexplored due to the complexity of the screw geometry. This study uses Lagrangian Coherent Structures to understand laminar mixing in various elements of twin-screw extruders and offers a novel viewpoint for geometry optimization.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Engineering, Manufacturing
Joaquim Manoel Justino Netto, Amir Ilkiu Sarout, Andre Luiz Grando Santos, Alessandra de Almeida Lucas, Marcelo Aparecido Chinelatto, Jorge Lino Alves, Antonio Gaspar-Cunha, Jose Antonio Covas, Zilda de Castro Silveira
Summary: This paper presents the design and validation of an innovative 3D printer with a co-rotating twin screw extrusion unit, which offers improved mixing capacity and process flexibility. The feasibility of the design was verified through numerical calculations and extrusion tests, and successful printing of various samples was achieved.
ADDITIVE MANUFACTURING
(2022)
Review
Pharmacology & Pharmacy
Rajat Radhakrishna Rao, Abhijeet Pandey, Aswathi R. Hegde, Vijay Induvadan Kulkarni, Chetan Chincholi, Vinay Rao, Indu Bhushan, Srinivas Mutalik
Summary: The article explores the transformation towards systematic processing using continuous manufacturing (CM) and automated model-based control, as well as various granulation techniques using twin screw extrusion technology. The future of granulation lies in coupling continuous TSE with computational mathematical studies.
Review
Polymer Science
Abishek Kafle, Eric Luis, Raman Silwal, Houwen Matthew Pan, Pratisthit Lal Shrestha, Anil Kumar Bastola
Summary: This article discusses three widely used polymer-based 3D printing processes - FDM, SLS, and SLA, providing a comparative overview of material-process-properties and advanced requirements for 4D printing. It also serves as a guide for selecting suitable print materials and techniques for polymer-based applications, as well as discussing implementation practices towards 4D printing of polymer-based systems.
Review
Engineering, Chemical
Shichoon Lee, Hyungsu Kim
Summary: The intermeshing corotating twin screw extruder is used for compounding polymeric materials with modular screw configurations. The principles of screw configuration and guidelines for screw combination based on feeding, melt mixing, and metering zones are essential for controlling product quality and productivity. Various screw combination strategies are presented for different cases, including side feeding, reactive extrusion, devolatilization process, and processing of materials with specific requirements.
KOREAN CHEMICAL ENGINEERING RESEARCH
(2021)
Article
Engineering, Chemical
Byung Min Lee, Xuesi Gao, Han Sung Kim, Wook Ryol Hwang
Summary: A new modeling scheme for flows of non-Newtonian fluids in a co-rotating twin screw extruder is proposed, with emphasis on the application to lithium-ion battery slurries for electrode manufacturing. The relationship between flow rate, screw speed, and pressure build-up was predicted for various non-Newtonian fluids by introducing the effective viscosity and effective shear rate based on energy dissipation rate. Numerical validation was performed using power-law fluids, a Carreau fluid, and a Herschel-Bulkley fluid (anode slurries) for a narrow-pitched conveying element module.
CHEMICAL ENGINEERING SCIENCE
(2023)
Article
Polymer Science
Xiang Gao, Avraam I. Isayev, Xiaoping Zhang
Summary: The study investigated the effect of ultrasound-assisted twin-screw extrusion technology on the dispersion and distribution of carbon nanotubes in polycarbonate composite films. It was found that the screw configuration and ultrasound had significant effects on the performance of the composite films.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Engineering, Chemical
Tianwen Dong, Jianchun Wu
Summary: This study investigates the numerical applications of smoothed particle hydrodynamics (SPH) for simulating non-Newtonian flow in conveying elements of twin-screw extruders. The results highlight the significant impact of rheological properties on the flow behavior under different filling conditions.
POLYMER ENGINEERING AND SCIENCE
(2022)
Article
Pharmacology & Pharmacy
Jamie E. Spahn, Amr Hefnawy, Hugh D. C. Smyth, Feng Zhang
Summary: This study assessed the feasibility of using twin-screw extruders as mixers for dry powder inhalation and found that they can effectively function as mixers for inhalable powders, thus enhancing the continuous manufacturing capability of dry powder inhalers.
INTERNATIONAL JOURNAL OF PHARMACEUTICS
(2022)
Editorial Material
Materials Science, Multidisciplinary
Olegas Prentkovskis, Pavlo Maruschak, Sergey Panin, Filippo Berto
Article
Materials Science, Multidisciplinary
Natalia Narkevich, Ilya Vlasov, Mikhail Volochaev, Yulia Gomorova, Yury Mironov, Sergey Panin, Filippo Berto, Pavel Maksimov, Evgeny Deryugin
Summary: The paper presents the results of tensile and impact bending tests on a high-nitrogen austenitic stainless steel at temperatures ranging from -196 to 20 degrees C. The steel exhibited a ductile-to-brittle transition, but still maintained high strength and ductile fracture behavior at low temperatures. The microstructure and fracture surfaces were examined using electron microscopes and X-ray diffraction. The study revealed that brittle fracture was induced by epsilon-martensite formation, along with the presence of internal stresses at the grain boundaries due to nitrogen segregation and lattice volume changes.
Article
Biochemistry & Molecular Biology
Dmitry I. Grachev, Evgeny A. Chizhmakov, Dmitry Yu. Stepanov, Dmitry G. Buslovich, Ibragim V. Khulaev, Aslan V. Deshev, Levon G. Kirakosyan, Anatoly S. Arutyunov, Svetlana Yu. Kardanova, Konstantin S. Panin, Sergey V. Panin
Summary: This research focuses on the formalized approach to dental material selection (DMS) in manufacturing removable complete dentures (RDC). Three types of commercially available polymethyl methacrylate (PMMA) grades, processed by an identical Digital Light Processing (DLP) 3D printer, were compared. The developed DMS procedure employs the extended VIKOR method to conduct a fully fledged analysis of alternatives, taking into consideration the prosthesis design and its production route. The proposed approach has the potential to enhance the efficiency of prosthetic treatment by optimizing the DMS procedure.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Chemistry, Physical
Vladislav O. Alexenko, Sergey V. Panin, Dmitry Yu. Stepanov, Anton V. Byakov, Alexey A. Bogdanov, Dmitry G. Buslovich, Konstantin S. Panin, Defang Tian
Summary: The optimal mode for ultrasonic welding of PEEK-prepreg-PEEK lap joint with CF fabric reinforcement was determined using artificial neural network simulation. Experimental verification showed that mode 10 ensured both high strength properties and preservation of structural integrity of the CF fabric.
Article
Polymer Science
Sergey V. Panin, Alexey A. Bogdanov, Alexander V. Eremin, Dmitry G. Buslovich, Ivan S. Shilko
Summary: The goal of this research was to study the difference in resistance to cyclic loading between two amorphous polymer matrix composites (polyimide and polyetherimide) and investigate the influence of their material structure. The results showed that polyimide exhibited higher resistance to cyclic creep and fatigue damage accumulation compared to polyetherimide, resulting in longer fatigue life. This research is of great significance in solving the problem of fatigue life monitoring for particulate polymer composites.
Article
Materials Science, Multidisciplinary
Alexey Panin, Marina Kazachenok, Konstantin Krukovskii, Dmitry Buslovich, Lyudmila Kazantseva, Sergey Martynov, Elena Sklyarova
Summary: Scanning electron microscopy, 3D optical surface profilometry, X-ray diffraction, and electron backscatter diffraction analysis were used to study the effects of ultrasonic impact treatment (UIT) and ultrasonic impact electrospark treatment (UIET) on Ti-6Al-4V samples. The UIET procedure with the WC-6%Co striker resulted in the deposition of a thick coating consisting of tungsten and titanium-tungsten carbides, as well as titanium oxide. The UIET process in argon gas produced a dense and thick coating, while the microhardness levels were affected by the process and the wear resistance was improved by the UIET procedure in air.
Article
Chemistry, Multidisciplinary
Sergey V. Panin, Jiangkun Luo, Dmitry G. Buslovich, Vladislav O. Alexenko, Lyudmila A. Kornienko, Anton V. Byakov, Artur R. Shugurov, Konstantin S. Panin, Filippo Berto
Summary: The tribological performance of PI- and PEI-based nanocomposites reinforced with chopped carbon fibers (CCF) and additionally loaded with halloysite nanotubes (HNTs) and carbon nanotubes (CNT) was studied. The PEI/10CCF/1HNT nanocomposite exhibited the highest wear resistance and absence of microabrasive damage in the point contact. A tribological layer was formed on both PI- and PEI-based nanocomposites in the linear contact, governed by the development of creep and mixing processes. The PEI-based nanocomposite loaded with CCFs and HNTs is a promising inexpensive material for metal-polymer friction unit components due to its higher manufacturability and lower cost.
APPLIED SCIENCES-BASEL
(2023)
Article
Physics, Multidisciplinary
D. G. Buslovich, S. V. Panin, V. O. Alekseenko, L. A. Kornienko, J. Lo
Summary: The paper investigates the structure, mechanical, and tribological properties of polyimide (PI) and polyetherimide (PEI) based composites. The addition of polytetrafluoroethylene (PTFE) particles to these polymers enhances antifriction properties by forming a transfer film (TF) on the counterface. Tribological tests reveal that at point contact, the wear rate and coefficient of friction remain low regardless of the polymer matrix and counterface material. In linear contact, the uniform distribution of PTFE particles in PI/PTFE composites leads to a significantly lower wear rate compared to PEI/PTFE composites. However, tribochemical interaction with the steel counterface prevents achieving a low coefficient of friction for PI/PTFE.
RUSSIAN PHYSICS JOURNAL
(2023)
Article
Physics, Multidisciplinary
S. V. Panin, A. A. Bogdanov, A. V. Eremin, D. G. Buslovich, M. V. Burkov
Summary: The change in creep under cyclic loading on PI and PEI composites loaded with CFs has been studied. It is found that in the LCF mode, the durability of PI composites is several times higher and the growth rate of cyclic creep is several times lower than that of PEI composites with the same CF loading. The higher growth rate of cyclic creep for CF-loaded PEI is attributed to the greater flexibility of the polymer macromolecule and its ability to rearrange the microstructure.
RUSSIAN PHYSICS JOURNAL
(2023)
Article
Polymer Science
Dmitry G. Buslovich, Sergey V. Panin, Jiangkun Luo, Ksenya N. Pogosyan, Vladislav O. Alexenko, Lyudmila A. Kornienko
Summary: This study investigates the formation and adherence characteristics of tribofilm on the wear track surface of antifriction PI- and PEI-based composites, as well as a transfer film on a steel counterface. It is found that PTFE nanoparticles melted and coalesced into micron-sized porous inclusions during hot pressing. The dimensions of these inclusions were larger in the PEI matrix compared to the PI matrix, hindering their effectiveness as uniformly distributed nanofillers.