2024_31/1

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https://dspace.tul.cz/handle/15240/174542

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Browsing 2024_31/1 by Author "Technická univerzita v Liberci"

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    ANALYSIS OF AIRFLOW RESISTIVITY AND ACOUSTIC ABSORPTION OF FIBRE-REINFORCED PLASTIC COMPOSITES MADE OF POLYLACTIC ACID AND NATURAL FIBRES
    (Technical University of Liberec, ) Stehle, Franziska; Gillner, Christiane; Dilba, Boris; Keuchel, Sören; Herrmann, Axel S.; Technická univerzita v Liberci
    This study compares the airflow resistivity and acoustic properties of fibre-reinforced plastic composites (NFRP) with different mixing ratios of polylactic acid (PLA) and the natural fibres flax and cotton for the application in construction as lightweight structures, car door linings or seat pans. The composites are made from the binder fibre PLA, the bast fibre flax and two different kinds of cotton. Nonwovens are consolidated with a thermoforming process to manufacture the NFRP. The addition of cotton improves the absorption by increasing the number of air pockets (pores) and reducing their shape due to the fineness of the cotton. The airflow resistivity of samples with different mixing ratios were analysed and compared. The airflow resistivity is modelled with different calculation models that use distinct material parameters and the transferability is assessed. Further, the absorption coefficient is analysed and compared to the airflow resistivity. The study shows that there is a dependency of the two parameters.
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    ANALYSIS OF VIETNAMESE WOMEN'S BODY SHAPE FROM ANTHROPOMETRIC DATA
    (Technical University of Liberec, ) Tran, Thi Minh Kieu; Tran, Thi Ngoc Hu; Nguyen, Thanh Tung; Hoang, Sy Tuan; Technická univerzita v Liberci
    This study aims to classify and analyze the body shapes of Vietnamese women aged 18 to 50 using 3D anthropometric data. Research data was collected from 480 females across three regions: North, Central, and South. The five body types result from data analysis involving principal component analysis, K-means cluster analysis, numerical discriminant analysis, ANOVA test, and T-test comparison using SPSS software. Group 1, accounting for 15.23 %, represents the “short, thin, small-shouldered” body type with medium hip height and a bust-waist ratio higher than the hip-waist ratio. Group 2, accounting for 18.36 %, can be described as the “tall, slightly fat and large-shoulders” body type, characterized by high stature and hip height, with a bust-waist ratio smaller than the hip-waist ratio. Group 3, accounting for 35.94 %, falls under the category of the "Medium body type", with an average height stature and a fit body, and a bust-waist ratio equal to the waist-to-hip ratio. Group 4, representing 21.88 %, has a low hip height, a bust-waist ratio higher than the hip-waist ratio, and can be called the “short, fat, medium-shoulder” body type. Finally, group 5, which comprises 8.59 %, embodies the “too fat, average height, big shoulders” body type, featuring low hip height, and a bust - waist ratio higher than the hip-waist ratio. The method of body classification in this study is scientifically sound and reliable. The new research results can serve as a reference for the garment industry while contributing to the goal of building a virtual model library within 3D design software.
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    EFFECT OF COMMERCIAL WATER REPELLENT AGENTS ON FUNCTIONAL PROPERTIES OF POLYESTER WOVEN FABRIC USED FOR WASHABLE MEDICAL MASKS
    (Technical University of Liberec, ) Tho, Luu Thi; Phuong, Duong Thi; Huong, Chu Dieu; Technická univerzita v Liberci
    Water repellent fabrics are always used for washable medical mask production to keep them from the bacterial liquid during use. Choosing the right water repellent which is efficient and suitable for fabric is important in washable medical mask production. The water-resistant treated fabric needs to keep its water repellent for many washed cycles. Moreover, their physico-mechanical properties such as air permeability and thickness must be less changed. In this study, four commercial water-resistant chemicals (Ruco–Coat BC 7068, TP – Phob FC 2904, Phobotex RHP Hydrophobic Agent, Ruco-guard AFB60) were used to treat the 100% polyester woven fabric to examine the influence of the type and concentration of the waterresistant chemicals on water repellent capability of the polyester woven fabric. The fabric thickness and the air permeability of the untreated and treated fabric were investigated. The SEM, FE-SEM analysis, and the FTIR spectra were used to find the differences between the initial and treated fabric. The results showed that the water-resistant type influenced the water repellent capability of fabrics and their duration. Among four investigated water resistance, the TP – Phob FC 2904 presented the best water resistance for treatment of the 100% polyester woven fabric, and its concentration of 50 g/l has maintained 85 % fabric water repellent capability after 25 washed cycles.
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    WOUND DRESSING WITH TEXTILE DRESSING APPROACH: A REVIEW
    (Technical University of Liberec, ) Shahidi, Sheila; Moazzenhi, Bahareh; Kalahroodi, Hosseini Kimiasadat; Mongkholrattanasit, Rattanaphol; Technická univerzita v Liberci
    To help healing, protect and care the wound from additional damage, a sterile dressing is applied to wound and injured area. Wound dressing can be a sterile pad or compress that directly contact with the wound area. Nowadays, different models of wound dressings are used in the medical field. In this review paper different wound dressings and efforts made on the textile based wound dressings discussed.