Manufacturing Technologies: Materials, Operation and Applications

文章题目 页数

作者: Volodymyr Krasinskyi, Oleg Suberlyak, Ľudmila Dulebová, Viktoria Antoniuk
摘要: A new method of layered silicate (montmorillonite) intercalation by polyvinylpyrrolidone in the solution under ultrasonic treatment is described in this work. The structure and thermophysical properties of the developed nanomodifier and the components rational ratio have been investigated. The effect of intercalated montmorillonite on physico-mechanical, thermophysical and insulating properties of polycaproamide PA-6 has been determined.
作者: Vojtech Senkerik, Michal Stanek, Martin Ovsik, Lenka Hylova
摘要: This research paper studies the influence of preparation method of recycled polymer material with glass fibers on the tensile properties of the final product. The recycled material was made from polypropylene, which originally contained 30 % of glass fibers. It was divided into fractions using size of the crushed particles. These fractions ranged from large particles, similar to the original material, to small dust particles. Measurements were performed at various temperatures. It was found that the mixture of dust particles showed a large decrease in measured properties. It is mainly due to shortening of the large glass fibers, so that it no longer fulfills its function as reinforcing filler. Conversely, mixture with larger particles did not show a significant decrease in properties compared to the original material.
作者: Ales Mizera, Pavel Stoklasek, Martin Bednarik
摘要: Radiation processing of polymers is a well-established and economical commercial method of precisely modifying the properties of polymers, especially physical properties. The physical properties of modified polyamide 11 samples by beta rays were measured at the ambient and elevated temperature. The tested samples showed significant changes of physical properties between ambient (23°C) and elevated (80°C) temperature. From this point of view, new applications could also be seen in areas where more expensive materials are used, especially for application in automotive industry.
作者: Pavel Stoklasek, Ales Mizera, Miroslav Manas
摘要: Radiation cross-linking of polymers is a good modification method of modifying the properties of polymers, especially mechanical properties. The mechanical properties of non-irradiated and irradiated nylon 6 samples by beta rays were measured at the ambient and elevated temperature for comparison. The tested samples showed noticeable changes of mechanical behavior between ambient (23°C) and elevated (80°C) temperature and between non-irradiated and irradiated samples. It is possible to use these results in the practice because they clearly shows that radiation cross-linking influences the mechanical properties in most ways positively.
作者: Martin Bednarik, Adam Skrobak, Vaclav Janostik
摘要: This study deals with the effect of high doses of ionizing beta radiation (132, 165 and 198 kGy) on mechanical properties (tensile strength, tensile modulus and elongation) of low and high density polyethylene under thermal loading. The measurement results of this study indicate that with an increasing dose of radiation grows tensile strength and modulus of low and high density polyethylene. For all examined materials were also observed changes in elongation.
作者: Iveta Pandová
摘要: A new technologies and materials stand at front of thescientific interest. Their development leads to technological potential increasing at various fields of industry.Progressive new materials are based on the development of nanotechnologies and nanomaterials, which have a widerange of the applications in manufacturing, medicine and the environment protection. There sult of the hugeefforts in the development of nanostructured materials, the amount of new material sthat are the building blocks of nanoparticles with defineds tructures and properties. Progress in the use of nanotechnologies and nanomaterials has been noticed in the area of water protection, because they develop a modern, economically viable and environmentally more acceptable sewage processes and materials. At this sphere new zeolite products are developing with modified external surface.
作者: Ľudmila Dulebová, František Greškovič, Janusz W. Sikora, Volodymyr Krasinskyi
摘要: The paper deals with the influence of environmental degradation on the change of the mechanical properties of polymer nanocomposites. The tested material was polyamide (PA) filled with nanoclay fillers Cloisite 30B, Cloisite 93A and Cloisite Na + in a volume of 2, 4 and 6 wt%. Test samples were produced by injection molding and were subjected to 540 hours and 1080 hours of UV radiation. The change of mechanical properties of PA6/MMT nanocomposite systems after the ageing in the UV chamber was studied by tensile test and Charpy impact resistance test. Article also compares structure of PA6/MMT nanocomposite.
作者: Radoslav Krehel', Marek Kočiško
摘要: The article describes application of using liquid crystals in area of contactless scanning. Concrete application is showed in a turning process oriented to controlling and direction. Polarising attributes of liquid crystals is used in integration of exactness and sesitivity of electrostatical scanning principe and stability and simplicity of optical scanning, whole system has a higher resistance to an exterior disturbing actions and resistance to a possible electrostatical discharge. The article describes a consecution and conditions of practical measuring of principe ́s attestation, elaboration and interpretation of measuring answer.
作者: Martin Lachman, Jiří Šafka
摘要: Laser technologies are considered to be unconventional technologies. Laser cutting is one of the most popular industrial operations that use a laser beam. Fibre lasers are most commonly used for cutting metallic materials. The aim of this paper is to experimentally demonstrate a procedure for determining the focal length of a laser beam from the output of the cutting head of a JK400FL fibre laser. Along with other factors, the correct position of the focal point of a laser beam cutting materials, plays a vital role in the quality of the cut and also in determining the cutting speed. It is possible to use a higher cutting speed of the laser machine, without compromising the quality of the cut.