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Dyeing of cotton with madder using (bio)mordants: effects on fastness and UV protection properties
No full textThis work aimed at studying the dyeing of cotton fabrics with madder extract using two biomordants,
quebracho tree extract (Schinopsis spp.) and laccase. Pre-treatment with quebracho increased the colour
strength, washing and UV light fastness, and UV protection, while laccase only shows an increase in
the UV light fastness. The application of biomordants together with the metal ones (aluminium or iron
salts) led to an improved UV light fastness compared to the samples mordanted only with metal salts.
Meanwhile, although the colour strength was lower than in the metal-mordanted samples, greater UV
protection factors were obtained in the samples pre-treated with quebracho or laccase and iron salt
Elastic recovery of full plaited knitted fabric
No full textIn this paper, fabric growth of elastic full plaited single jersey knitted fabric were investigated. Full
plaited fabric knitted were produced from combed yarn 35 Ne at 2.9 mm and five levels of spandex
weight percent (4, 5, 6, 7, 8%). For comparison, 100% cotton fabric was produced at the same yarn
count and loop length. Flexi-frame was designed according to ASTM D2594–04 to measure fabric
growth and stretch, as investigated below. The fabric growth of elastic samples were less than 100%
cotton samples and fabric growth in wales direction (FGW) was less than fabric growth in course
direction (FGC) for both 100% cotton and elastic knitted fabrics
Sensing properties and characteristics of the elastic sensing webbing
No full textIn this work, an elastic sensing webbing was designed and woven, using conductive yarns as continuous
wefts for resistive sensing. With stretch strain of the webbing in the warp direction, weft yarns could
move or contact in changed ways, thus the resistance of elastic sensing webbing shows a variation
response. In this research, effects of fabric structure, fineness of elastic yarns, and on-machine weft
density on sensing were investigated, and the way that conductive yarns work for resistive strain sensing
function was observed. Finally, it was efficiently verified that the type of looped webbing selvage is the
core reason for sensing, the resistance and sensitivity under 60% strain would be changed with the
different variables. The samples with higher on-machine weft density and 4/2 twills had the higher
sensitivity, while there is no regular effect of elastic yarn fineness. Generally, this type of elastic sensing
webbing could provide a relative ideal performance on sensing with high stress and low strain
Modification of cotton fabric using a three-component Ag/TiO2/g-C3N4 composite to improve protection against UV radiation
No full textIn 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
Jak nie spaść z krzesła ewakuacyjnego i innych z niego nie zrzucić – czyli subiektywne wrażenia z warsztatów z bezpiecznej ewakuacji
No full textXIII Sesja Magistrantów i Doktorantów Łódzkiego Środowiska Chemicznego
No full textPod patronatem JM Rektora Politechniki Łódzkiej prof. dra hab. inż. Krzysztofa JóźwikaNiniejsze materiały konferencyjne zostały przygotowane na podstawie materiałów nadesłanych przez uczestników XIII Sesji Magistrantów i Doktorantów Łódzkiego Środowiska ChemikówRedakcja nie ponosi odpowiedzialności za treść publikowanych streszczeńProjekt okładki : dr hab. inż. Elżbieta KuśmierekAutor zdjęć : lic. Jacek SzabelaSesja Magistrantów i Doktorantów Łódzkiego Środowiska Chemików jest przeglądem osiągnięć naukowych oraz forum wymiany doświadczeń przedstawicieli szkół wyższych i jednostek naukowych zajmujących się problematyką chemiczną na terenie Łodzi. Spotkania te corocznie gromadzą wielu studentów i doktorantów oraz ich promotorów. Najlepsze komunikaty i postery są nagradzane
Flame-retardant textiles: a general overview
No full textThe use of conventional methods such as water, foam, gas, and powder fire extinguishing capsules
requires timely presence and operation at the site of the fire. In many cases, the fire occurs imperceptibly.
There are lots of cases causing a fire in homes and other places, one of which is the short circuit of
electrical appliances. If people are not present in such a place, a small spark can have catastrophic
consequences. Fire is easily and rapidly transmitted through walls, ceilings, upholstery, floor coverings,
wallpapers, curtains, or pipes throughout the house and between floors of a building. Under these
conditions, slowing down the flame propagation provides enough time for the fire brigade to arrive and
take further action. Therefore, preventing a fire, extinguishing it in the early stages, or slowing its
progression can reduce lots of damage to life and property. The advent of flame retardants has helped
to reduce the damage. The emergence of textiles has brought many benefits and functionalities to life.
In return for these benefits, the possibility of their ignition is a major concern. Therefore, familiarity
with textiles burning mechanisms and methods to deal with it is essential for the safety of buildings,
appliances, and vehicles
Influence of yarn fineness on fabric conductivity
No full textThe application of conductive fabrics is extremely wide and applies primarily to areas such as protective
textiles, smart textiles, e-textiles, textile for medical applications, etc. The influence of conductive spun
yarn, made from carbon and aramid fibres blend, on fabrics conductivity was investigated. Three types
of fabrics, with different fineness and structures of conductive yarns in the weft direction were woven
and tested. The relevant properties of the yarns were investigated, as well as the properties of the woven
fabrics, which fully contribute to the fabrics conductivity properties. This was confirmed by testing the
surface and vertical electrostatic resistance of the fabric, i.e. conductivity