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Stały URI dla kolekcjihttp://hdl.handle.net/11652/4411

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20224

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  • Pozycja
    Comparative evaluation effects of thermal degradation, burning behavior, and intumescent char formation of cotton fabrics coated with alkaline and acidic casein solutions
    (Wydawnictwo Politechniki Łódzkiej, 2022) Faheem, Sajid; Nahid, Nazia; Wiener, Jakub; Mazari, Adnan; Baheti, Vijay; Militky, Jiri
    The present research work was aimed to investigate and study the effect of coatings of different concentrations and pH of aqueous casein solutions on thermo-oxidative properties, flame retardant performance, and intumescent char formation phenomenon of cotton fabrics. The flame retardant behavior of fabric samples was found to increase with an increase in the concentration of casein solutions in both alkaline and acidic pH conditions. The casein solution of acidic pH was found to yield more char residue than the alkaline casein solution, which evinced their better thermo-oxidative properties. The SEM micrographs of char residues also revealed the formation of stronger and coherent char with the presence of intumescence. Furthermore, the phenomenon of intumescence was largely observed in the case of cotton fabric samples coated with acidic casein solution.
  • Pozycja
    Effect of knit stitches percentage on physical parameters of weft-knitted fabrics
    (Wydawnictwo Politechniki Łódzkiej, 2022) Basra, Sikander Abbas; Kumpikaitė, Eglė; Asfand, Norina
    In this study 100% cotton 29.5 tex yarn was used to develop hybrid knitted structures with a combination of knit, tuck and miss stitches. A single jersey circular weft machine (FUKUHARA, Japan, 1992) with diameter 30 inches and gauge 20E was used to develop the samples. The samples were scoured, bleached, dyed, and treated with softener. The physical properties of the samples, e.g. area density, thickness, and wale and course density were determined according to the standard test methods. It was concluded from the analysis of results that fabric area density and thickness were found to depend on the percentage of different stitches in the fabric structure.
  • Pozycja
    Modification of cotton fabric using a three-component Ag/TiO2/g-C3N4 composite to improve protection against UV radiation
    (Wydawnictwo Politechniki Łódzkiej, 2022) Glažar, Dominika; Štular, Danaja; Urbas, Raša; Tomšič, Brigita; Šobak, Matic; Jerman, Ivan; Chouhan, Raghuraj S.; Simončič, Barbara
    In this study, the chemical modification of cotton fabric to develop UV-protective properties is presented. For this purpose, TiO2 and a three-component Ag/TiO2/g-C3N4 composite were synthesised ex-situ and were applied to cotton fabric using a pad–dry–cure method. The presence of the composite on the cotton fibres was detected using the SEM, EDS and FTIR methods and with a digital microscope. The results show that the application of TiO2 increased the UV protection of the cotton fabric compared with the untreated fabric. The combination of TiO2 with Ag and g-C3N4 in the composite further improved the UV protection of the cotton fabric, as the absorption in the UVA range increased significantly. This resulted in a large increase in the UPF value, placing the cotton fabric in the excellent protection category. This proves the cumulative effect of the components in the composite.
  • Pozycja
    Technological design of jacquard fabric and their functionalization
    (Wydawnictwo Politechniki Łódzkiej, 2022) Kostajnšek, Klara; Bajrič, Špela; Bizjak, Matejka
    Functionalization of fabrics allows us to influence the physical-mechanical properties by using special yarns that improve fabric's properties, such as elasticity [1,2], thermal regulation [3,4], protection against ultraviolet (UV) rays [5–7], etc. In addition, from a design point of view, the shape and size of the pattern, its frequency and area distribution are also important, not only as a visual effect, but also in terms of the above-mentioned properties [8–10]. The aim of the study was to determine how different weft yarns, the size of the pattern and weave affect the final properties of the jacquard fabric. Six jacquard fabrics were woven on the same warp with two different weft yarns (cotton, Lyocell Clima) in two different patterns and two groups of double twill weaves (stiched and unstiched). The results show that fabrics made of cotton have poorer mechanical properties and lower permeability than fabrics with Lyocell Clima weft. Double unstitched fabrics generally have poorer mechanical properties and UV protection factors (UPF), but better air permeability values. A statistically significant influence of the raw material was shown for thickness, mass, thermal conductivity, tensile strength and, in the case of the size pattern and weave, for air permeability, breaking and tear strength.