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    Comparative Analysis of Different Lyocell Types: Structural, Physical, Mechanical, and Moisture-Related Comfort Properties in Single Jersey Fabrics
    (Korean Fiber Soc, 2023) Kucukali-Ozturk, Merve
    The demand for fibers with improved technical performance and user comfort has led to the development of sustainable man-made cellulosic fibers as an alternative to natural fibers. This study focuses on investigating the structural, physical, mechanical, and moisture-related comfort properties of single jersey fabrics containing different types of lyocell fibers. Although lyocell fibers have been produced using similar processes, our results showed that they displayed some differences in their properties which were reflected in their yarn and fabric performances. Accordingly, Type B lyocell fiber stands out in terms of mechanical and comfort properties. Previous studies mainly focused on the specific types of lyocell fibers, and this research provides a comparative analysis of the different types. The findings contribute to understanding the performance characteristics of various lyocell fiber types and can assist in informed material selection for textile applications.
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    Design of composite insulation panels containing 100% recycled cotton fibers and polyethylene/polypropylene packaging wastes
    (Elsevier Sci Ltd, 2021) Sezgin, Hande; Kucukali-Ozturk, Merve; Berkalp, Omer Berk; Yalcin-Enis, Ipek
    The aim of this study is to produce high value-added composite materials by combining textile and packaging waste from two different sectors. Waste denim fabric was used as the reinforcement material, while polypropylene and polyethylene bottle caps, food, and cleaning containers were used as the matrix material for the production of composite panels. These composite panels were investigated in terms of air permeability and thermal and acoustic insulation behavior. The results indicate that the developed textile-based composite panels are applicable as commercial support materials and offer improved thermal and acoustic insulation properties. The developed composite material provides sound transmission loss up to 8 dB, and improves the thermal resistance value up to 0.11 m(2)degrees C/W. On the other hand, the flame retardant property of this composite material should be tested and developed at the point of applicability as an insulation material. (C) 2021 Elsevier Ltd. All rights reserved.
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    Upcycled textile and agricultural waste for thermal and acoustic insulation solutions
    (Keai Publishing Ltd, 2026) Yalcin-Enis, Ipek; Kucukali-Ozturk, Merve; Sezgin, Hande
    This study investigates a novel combination of materials, incorporating pantyhose and rice husk, to develop sustainable insulation panel candidates, an approach that has not been previously explored in the literature. Pantyhose, composed primarily of polyamide and elastane, are frequently discarded due to their short lifespan, while rice husks are a common agricultural by-product. Pantyhose waste was processed into fibers and formed into web structures using a carding machine. Two production methods were employed to create insulation panels: needle punching and hot pressing. For needle-punched panels, the fiber composition and number of layers (2-plied and 4-plied) were varied. Composite panels were produced in the same plies via hot pressing, incorporating polypropylene fibers as binders (10% wt.) and rice husks in powder or granule form (20% wt.). Key performance tests included sound absorption, thermal conductivity, air permeability, fiber composition, thickness, and density. Results showed that composite panels exhibited superior sound absorption, with the addition of rice husk powder further enhancing performance; the best-performing sample (C-4P-PW) reached a sound absorption coefficient of 0.74 at 2500 Hz. Conversely, needle-punched panels provided better thermal insulation, with sample N-2P-FB achieving the lowest thermal conductivity of 0.038 W m-1 K-1 due to its porous structure. This study highlights the potential of combining textile and agricultural waste to develop ecofriendly insulation materials, which are considered promising candidate materials pending further validation for building applications.