2023_30/4
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- ItemIMPROVE BUILDING DATABASE ON THE OPERATION PROCESS AND PERFORMANCE TIME FOR SEWING OPERATIONS OF KNITTED GARMENT PRODUCTS(Technical University of Liberec, ) THAO, PHAN THANH; PHAN, DUY-NAM; Technická univerzita v LiberciThis paper presents the findings of the study of building and completion of a standard database on the operation process and sewing time for 02 typical products from knitted fabrics, namely Polo-Shirt and TShirt. The study process is carried out based on applying MTM (Methods Time measurement) standard time analysis method and predetermined time system GSD (General Sewing Data). In this research, we have inherited the results from previous studies including Classifying the main parts sewing linkages, formulated sewing technology process and theoretical analysis of the process of manipulating sewing of the main parts, linkages of the 02 classical textile products including Polo-Shirt and T-Shirt by MTM standard time analysis method and GSD predetermined time system; The studies work of the group of authors on the experimental research content determines the simultaneous influence of a group of factors: distance to place the sewing element (cm), the rotation angle of the sewing element (˚), the size of the sewing element, the number of element layers involved in the sewing, the light intensity (lux) and the skills of sewing workers (grade worker) to the sewing time of knitting products and research simultaneous influences of a group of technological factors including: seam length (cm) and stitches per centimeter (stitches/cm), experiment on 4 sewing devices such as 1-needle lockstitch machine, overlock machine (1 needle and 3 threads) and (2 needles and 4 threads), coverstitch machine (2 needles and 3 threads); and with 3 kinds of single jersey fabrics, which are thin, medium, and thick fabrics to sewing time on the machine of Polo-Shirt and T-Shirt products. The above research results show that there is a big difference between the actual values and theoretically calculated values according to MTM method, GSD predetermined time system, the authors have determined a set of adjustment coefficients for the former and the latter for two values of sewing preparation operation time and sewing time on the machine. We have tested the above research results in 03 enterprises: Hanoi Star Fashion Co., Ltd., Tinh Loi Garment Company and Ha Nam Hanosimex Company Limited and received a lot of practical comments from businesses.
- ItemTHE INFLUENCE OF LOW-TEMPERATURE PLASMA ON PERMANENCE OF ANTIMICROBIAL NANO-FINISH(Technical University of Liberec, ) ŠČASNÍKOVÁ, KATARÍNA; DUBEC, ANDREJ; Technická univerzita v LiberciThis paper describes the effect of low-temperature plasma on increasing permanence of surface finish of textile materials using an antimicrobial nanosol. Selected textile materials (polyester and polyamide woven fabrics, polypropylene non-woven fabric) were pre-treated by surface activation with low-temperature plasma at atmospheric pressure and subsequently finished using an antimicrobial (AMB) nanosol with a concentration of 60 ppm Ag+, 120 ppm Ag+ in the application solution. The goal was to increase the permanence of AMB nano-coating of textiles after washing and drying. To verify the effect of low-temperature plasma on increasing the permanence of the nanolayer, washing and drying was performed in accordance with the STN EN ISO 6330 standard. To determine antibacterial activity and effectiveness of the nano-coated textile materials, a quantitative test method was used in accordance with the technical standard AATCC TM 100. Evaluation of the antibacterial activity of the textile materials was performed before washing and after 20 washing cycles.
- ItemONLINE WEAR ANALYSIS OF CARD CLOTHINGS(Technical University of Liberec, ) FISCHER, HOLGER; HEILOS, KATHARINA; THAL, DANIEL; FAASEN, ANDRÉ; HOFMANN, MARCEL; Technická univerzita v LiberciThe processing of abrasive fibres in the carding process, in particular high-performance fibres such as glass, carbon or aramid fibres, can cause increased wear of the card clothing. In the FutureTex project ‘HPFGarnitur’, the wear of card clothing was investigated and an online wear measurement system has been developed. The aim of the project was both, to optimize the clothings to enable gentler processing of the fibres, and to develop a digital monitoring system to observe the degree of wear of the clothings, which offers a new possibility for maintenance prediction and production planning in the sense of Industry 4.0.
- ItemPROPERTIES OF PARACHUTE FABRICS FROM POLYAMIDE AND POLYESTER MATERIALS(Technical University of Liberec, ) MILITKÝ, JIŘÍ; WIENER, JAKUB; KŘEMENÁKOVÁ, DANA; MISHRA, RAJESH; Technická univerzita v LiberciTraditional parachute fabrics are composed from PA 66 (nylon type) multifilament yarns. They are resistant against high frequency repeat deformation but they are able to absorb water which is not optimal for use in different climatic conditions. Challenge is to create parachute fabrics made of PES multifilament yarns which are more versatile. Main aim of this work is to investigate influence of parachute fabric composition and construction characteristics on real end use properties. The relationships based on the prediction of bulk densities were used to calculate the volume porosity. The morphology of the parachute fabrics was evaluated using scanning electron microscopy. Mechanical and dynamic mechanical properties of parachute fabric Ortex made from multifilament PA 66 and PES yarns by Sky Paragliders company are compared.
- ItemSTUDY THE SELF-CLEANING ABILITY OF ZNO CONTAINED COTTON FABRICS(Technical University of Liberec, ) PHAN, DUY-NAM; THI THAN THUONG, VU; NGUYEN NHAT, TRINH; NGUYEN MINH, TUAN; CAO HONG, HA; MINH THANG, LE; Technická univerzita v LiberciIn this study, ZnO nanoparticles were successfully synthesized by the precipitation method, then immobilized onto cotton fabric. The metal oxide nanoparticle-contained fabric exhibits a self-cleaning effect under ultraviolet (UV) illumination. The nanostructure of the prepared samples was detected using Scanning Electron Microscopy (SEM) analysis. The chemical composition changes of the fabrics before and after the modification were detected using The Fourier transform infrared (FT-IR) and Energy Dispersive X-ray Spectroscopy (EDS). After modification with ZnO nanoparticles, the cotton fabric exerted adsorption and decomposition properties again various chemical compounds. Stains of methylene blue (MB), and methylene orange (MO) were introduced into cotton fabric, under UV light, the dyes were faded and ultimately discolored. The degradation of pigments in the solution happened faster and was expressed by the concentration of dyes decreasing over time through UV-vis measurement results. The self-cleaning ability for MB and MO stained cotton fabrics is evaluated quantitatively over time through the K/S value, which showed a good self-cleaning effect.
- ItemA SUSTAINABLE APPROACH TO SEERSUCKER WOVEN FABRIC PRODUCTION: ELIMINATING ELASTANE AND DOUBLE BEAMS FOR NATURAL MATERIAL-BASED DESIGN(Technical University of Liberec, ) ASMA, AYÇIN; BURGUN, ALPER; DEMIREL, GIZEM; BUDUN GÜLAS, SINEM; Technická univerzita v LiberciNowadays, the increasing social consciousness on the protection of nature and, at the same time, the seeking for comfort and easiness caused by the pandemic, increase the interest in easy-to-use, comfortable textile products produced with natural raw materials. Seersucker woven fabrics are highly preferred in recent years due to their features such as providing wearing comfort and being user-friendly by not requiring ironing. However, in order to provide the three-dimensionality/wrinkle effect in woven seersucker fabrics in the currently used methods, it is necessary to use elastane in the weft/warp or to use double beams during production. At this point, it is not possible to produce completely natural fabric in the method using elastane, and in the other method, a special several warp and machine requirements are emerging. In this study, the literature on seersucker fabrics was reviewed and experimental seersucker weaving applications were carried out. Studies have been carried out in order to produce fabrics using completely natural raw materials (cotton), to improve production efficiency and to increase design possibilities. In this context, instead of the traditional methods used in seersucker fabric creation, seersucker fabric production was carried out with a single beam on the weaving machine by using different weaves in the dobby for fabric design. In this way, it has been provided that the seersucker weaving process can be performed with a single beam on any desired machine by using existing direct warps without the need for a special warp preparation.
- ItemVIRUSES AND THEIR PENETRATION THROUGH FIBROUS STRUCTURES: A REVIEW(Technical University of Liberec, ) MILITKÝ, JIŘÍ; WIENER, JAKUB; KŘEMENÁKOVÁ, DANA; Technická univerzita v LiberciIn the first part of this review the necessary information about structure and chemical composition of viruses are briefly discussed on the basic level. Main types of interaction of viruses with human cells are briefly described. The basic method of suppressing the spread of viruses from the surroundings of a healthy person and into the surroundings of an infected person is the use of protective equipment, especially face masks and respirators, where the active element is a fibrous structure. The protective functions of these structures depend on their composition (usually hydrophobic materials), construction (fabrics, knitted fabrics, nonwoven fabrics, nano-meshes), morphology (porosity, thickness, pore distribution), the form of virus propagation (usually in water droplets as a type of aerosol), interaction conditions with the surface of the protective layer (speed of impact, conditions of capture on the surface of the fibrous phase, speed of penetration) and the method of virus inactivation (usually contact or very short-range interaction). It is therefore a very complicated problem that is often solved using a combination of mathematical modeling and simulation. The purpose is to present some methods of solving problems related to the protective function of fiber structures, which allow the specification of the suitability of these structures for real use.