This paper proposes a comparative study of the tensile behaviour of the knitwear under linen made of 100% cotton yarn in 1:1 rib with Nm 50/1 and 2:2 rib with Nm 40/1. The rib structures 1:1 are more dimensionally stable than the rib structures 2:2, on both directions, due to the higher number of yarn-yarn contact points and due to the distribution of the rib platinum loop. The studies made on the proposed structures have demonstrated that it can be obtained an almost identical dimensional stability, which fits in the limits ±2, if for the rib structures 2:2 thicker yarns are being used. After knitting and finishing, the structure parameters of the knits are determined and then they are subjected to the tensile strength, and the result after processing the obtained data, it is concluded that the behaviour of the knits at the tensile stresses is comparable to the real situation. The study is carried out on both directions of the knits, in the horizontal direction, of the rows of meshes and in the vertical direction of the strings. The performance-elongation diagrams are represented through graphics and the results obtained are interpreted, the data being used to determine the structure parameters of the knits in order to obtain maximum dimensional stability at wearing.
In this paper we compared a classic technological lines and a fully automated line for the manufacturing of 100% cotton yarns. For this comparison we analyzed the complexity of classical and fully automated technological lines, the differences between the yarn structures, aspects related to the quality of textile yarns but also an analysis of production costs and benefits. The spinning mill is the first sector in the textile field, the sector in which the textile yarns are made. The quality of textile products, fabrics, knits, garments or technical articles are strictly dependent of the quality of textile yarns. The yarns are made of short fibres of cotton, wool, linen, hemp or other raw materials, with a great unevenness of the physical-mechanical characteristics, and the technological engineer must make a series of adjustments, settings of the machines so that the yarns made have a lower unevenness. This is the reason why the technological engineer must set the technological process so that the yarns are of adequate quality, have low production costs and deliver orders to the beneficiaries within the terms established by the commercial contracts concluded with them. In order to decrease the production costs, there were permanent concerns for the introduction of new automation elements, so that in the field of cotton spinning reached an extremely high level, right at the fully automated cotton spinning mill. Practical, on the technological line there are only two operators, one that supplies the technological line and one that transfers pallets with bobbins from the palletizing robot to the transport means. Practically the technological lines are composed of the same machines, but the automation elements on each machine and the aggregation systems between machines allow the almost complete elimination of the operators for service of machines. Given the complexity of the technological lines and the difference between the human resources for the two technological lines, in the first step we made a comparative calculation of the costs for the salaries of the operators and the taxes that an employer must pay. Then we made a comparative calculation of energy consumption. The comparative analysis was done for a cotton spinning mill with a production of 4000 t/year, classical yarn, 100% cotton yarn, with average fineness Nm40, made on ring spinning machines. Finally, we made a comparative study of the investment effort and the amortization of the investments made, amortizations which is reflected in the total costs and then in the delivery price of the yarns to the beneficiaries.
In this paper we compared a classic and an unconventional system for the manufacturing of cotton yarns 100%. For this comparison we analyzed the complexity of classical and unconventional technological lines, the differences between the yarn structures, the fields of use of the yarns, as well as a cost-benefit analysis. From the point of view of the complexity of the technological lines and implicitly of all the necessary adjustments we can say that the technological line for the unconventional system is much easy and shorter. Considering the complexity of technological lines, we can say that the human resources requirement is much lower for unconventional technological lines. For this we realised a comparative calculation of costs for workers and for taxes that an employer has to pay. Starting from the complexity of the technological lines, the unconventional technological line being shorter with two machines, we made a comparative calculation of the energy consumption. The calculations were made for a spinning mill with a production of 4000 t/year, a typical production for a medium size. From the point of view of the production costs and investment effort, we can say that the unconventional system is better, but considering the structure of the yarns we can say that the destinations are different, so the unconventional yarns are better suited to certain products, such as the jeans clothing.
In the current context of involvement in the fight against COVID 19 wearing protective masks are strictly necessary to limit the spread of the virus SARS-CoV2. Since the appearance of this virus, solutions have been sought to cover the needs of masks for the population and also to improve their wearing comfort compared to nonwoven fabric (TNT) masks. These masks are made of chemical fibres and it is recommended to be worn for a maximum of 4-8 hours and then they must be discarded. In this study, two types of masks from wool and silk blended knitted fabrics were manufactured and analysed. The masks were initially subjected to manual ironing sterilization and disinfection. Subsequently, several analyses were performed: specific mass, density, abrasion and pilling resistance, colourfastness to crocking, colour fastness to accelerated laundering, air permeability, bacterial filtration efficiency and breathability. The analysed masks can be washed and disinfected at home and are reusable. This aspect offers a strong sense of safety for the user, but also has beneficial effects on environmental protection. Even so, they do not correspond to bacterial filtration efficiency. Eventually, the comfort perception of about 300 volunteers was also taken into consideration.
Nowadays, humanity is facing serious challenges due to the disruption of the COVID-19 pandemic, affecting dramatically our healthcare system along with the economic structure, social and cultural life. Healthcare personnel treating patients with infections like COVID-19 are exposed themselves to infection. Therefore, it is compulsory to be protected from contaminated body fluids using personal protective equipment (PPE). This equipment made of synthetic fibers proved to be uncomfortable. Therefore, we developed a reusable suit composed of a blend of wool and silk to be wear under full-body protective clothing aiming to improve their comfort and safety. Firstly, we focused on the analysis of some dimensional characteristics: specific mass, porosity, thickness followed by comfort characteristics of knitted fabrics. Accordingly, the test methods comprise measurements for hydrophilic properties, air and water vapour permeability, thermal conductivity and dimensional stability to repetitive washing. After material analysis, a significant number of two-piece suits composed of blouse and trousers were industrially manufactured and delivered to healthcare personnel to be tested. The results are completed and supported with the perception of the healthcare staff involved in the study via a survey. Finally, the results and implications for future research are presented.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
334 Leonard St
Brooklyn, NY 11211
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.