Analiza wpływu składu surowcowego wyrobów odzieżowych na wybrane parametry fizjologiczne człowieka

Streszczenie pracy doktorskiej. Promotor: prof. dr hab. inż. Izabella KrucińskaW pracy przeprowadzono analizę wpływu składu surowcowego odzieży na parametry elektromiograficzne mięśni użytkownika. Materiał badań stanowiła odzież wykonana z tkanin lnianych, poliestrowych oraz mieszankowych lniana - poliestrowych. Analizie poddano odpowiedzialne za kreowanie komfortu właściwości tkanin przeznaczonych na odzież oraz parametry mikroklimatu w strefie skóra - odzież. Parametry elektromiograficzne mięśni obu kończyn górnych rejestrowano metodą EMG przed i po pięciogodzinnym osłonięciu ciała badaną odzieżą. Analizę wyników badań przeprowadzono z użyciem metod statystycznych dla zmiennych powiązanych i niezależnych. W oparciu o rezultaty badań stwierdzono, iż odzież wytworzona z tkanin poliestrowych jest przyczyną zmian parametrów elektromiograficznych mięśni, świadczących o wystąpieniu zjawiska desynchronizacji jednostek ruchowych. W przypadku odzieży lnianej, zmian o charakterze desynchronizacji, nie stwierdzono.The aim of the doctoral research was to prove the hypothesis claiming that clothing made of different raw materials, due to their different ability to effect sweating intensity, skin temperature and collecting electrostatic charges on the clothing surf ace, to various extent influences myographic parameters of user's muscles. During the study the fabric properties responsible for creating comfort and microclimate parameters in the skin-clothing sphere were analyzed. It was assumed that hygienic and electrostatic parameters, by creating specific microclimate, in certain ambient conditions and physical activity of the user' s can affect the electromyographic records of muscle moving units. These fabric properties depend on numerous factors, such as: raw materiał composition, fibre properties, type of yarn used in production and fabric structure. In order to reduce the number of variables, the study focused only on the influence of raw materiał composition on muscle tension, where tests were done on similar parameters of yarn, fabric and clothing for all types of tested raw materials. The verification of the hypothesis required testing clothes both for fabric properties and electromyographic testing of selected volunteers in the conditions of wearing the clothing. The clothes were made of two basie kinds of raw material: flax and polyester fibres as well as their blends - in ratio 75% flax/25% polyester fibre, 50% flax/50% polyester fibre and 25% flax/75% polyester fibre. For selected research materiał methodology was chosen to study the effect of clothing on electromyographic parameters of muscles. The records were taken from muscles of upper limbs of the same group of subjects before and after 5-hour-covering the bodies with the tested clothing. In the study values of electromyographic records were compared according to statistical methods used for dependent and independent variables. As a result of the tests the phenomenon of influence of clothing made of specific raw materiał on myographic parameters of muscles was identified. Drawing from the results, the following conclusions can be made: 1. Clothing made of linen fabrics cause change in electromyographic parameters of users' muscles to minimal ex tent. The slight changes that occur result from natural increase of human skin temperature, what happens during covering the body with clothes. The changes do not have desynchronizating character. 2. Clothing made of polyester fabrics is a elear cause of changes in myographic records of muscles in the subjects after 5-hour-covering the bodies with the tested clothing, what proves existence of desynchronization of muscle units. 3. Threshold value of polyester share in the blend with linen fibres is 25%. Clothing of such composition of raw materials does not cause desynchronization of healthy muscle units and at the same time provides optimal comf ort for the u ser. The results of the study demonstrated that the hypothesis is justified

The Influence of the Chemical Composition of Flax and Hemp Fibers on the Value of Surface Free Energy

The article presents the exploration of flax and hemp fibers’ surface free energy depending on the chemical composition of the fiber, which is closely related to the plant variety and the method of extracting the fiber. For this purpose, tests of the surface free energy (SFE), evaluation of the percentage content of individual fiber components and FTIR analyses were conducted. The research was carried out with the use of fibrous materials prepared in three different ways: 1. To analyze the effect of subsequent stages of flax fibers refining process on chemical composition and SFE, 2. to explore the dependence of fiber SFE on hemp variety, the water-retting hemp fibers were used, 3. To evaluate the influence of the retting method of hemp fibers BIAŁOBRZESKIE variety on SFE, the fibers extracted with the use of dew and water retting were used as the research material. The study confirmed that the content of individual components in the fiber influenced its sorption capacity and therefore determined its hydrophilic properties. The values of Pearson’s linear correlation coefficients determined in the statistical analysis proved that the surface free energy was strongly correlated with the content of individual components in the fibers. Understanding the wettability characteristics of bast fibers will allow modeling the properties of products made of these fibers and designing surface modification processes in order to obtain specific functionality of textile products, depending on their intended utilization

Effect of Blend Composition on Barrier Properties of Insulating Mats Produced from Local Wool and Waste Bast Fibres

This paper concerns the management of natural waste fibres. The aim of this research was the production of multifunctional acoustic and thermal insulation materials from natural protein and lignocellulosic fibre wastes, according to a circular bioeconomy. For the manufacture of the materials, local mountain sheep wool and a mixture of bast fibre waste generated by string production were used. Insulating materials in the form of mats produced by the needle-punching technique with different fibre contents were obtained. The basic parameters of the mats, i.e., the thickness, surface weight and air permeability were determined. To assess barrier properties, sound absorption and noise reduction coefficients, as well as thermal resistance and thermal conductivity, were measured. It was shown that the mats exhibit barrier properties in terms of thermal and acoustic insulation related to the composition of the mat. It was found that mats with a higher content of the bast fibres possess a greater ability to absorb sounds, while mats with higher wool contents exhibit better thermal insulation properties. The produced mats can serve as a good alternative to commonly used acoustic and thermal insulating materials. The production of the described materials allows for a reduction in the amount of natural fibre waste and achieves the goal of “zero waste” according to the European Green Deal strategy

Cottonization of Decorticated and Degummed Flax Fiber - A Novel Approach to Improving the Quality of Flax Fiber and its Biomedical Applications

There is a growing demand for high-quality natural fibers, including flax fibers, which possess bioactive compounds with antioxidant, antibacterial, and anti-inflammatory properties. Traditional methods like dew retting are commonly used for flax fiber production, but alternative approaches are sought for enhanced fiber quality. This study presents a novel method involving cottonization to improve the quality of flax fibers obtained from low-quality decorticated fibers. The research evaluates the quality enhancement through various stages of the new method, comparing it with dew retting. Studies conducted on both transgenic (B14) and non-transgenic flax fibers revealed a decrease in fiber polymers and bioactive compounds after cottonization compared to dew retting. However, despite this reduction, the antioxidant potential of cottonized fibers increased significantly. Moreover, cottonized flax fibers exhibited high antimicrobial activity, particularly against Pseudomonas aeruginosa. Furthermore, extracts from both transgenic and non-transgenic cottonized flax fibers showed cytotoxic effects on hamster lung fibroblast cells, indicating potential future applications in cancer research. These findings highlight the potential of cottonization in enhancing the quality and bioactivity of flax fibers, paving the way for further exploration in various applications, including medical and textile industries

Development of a Layer Made of Natural Fibers to Improve the Ecological Performance of the Face Mask Type II

The aim of this study was to develop a natural nonwoven layer made of cottonized bleached flax and cotton fibers which is suitable to replace one of the three polypropylene layers of face mask type II in order to reduce non-biodegradable waste production and limit the negative impact of used masks on the environment. The work focused on the design of a nonwoven structure based on properly blending cotton and flax fibers as well as ensuring the cover factor, which can support the mask’s barrier properties against air dust particles and does not make breathing difficult. Additionally, a biodegradable film was developed to connect the nonwoven layer with the other polypropylene filtering layers. The effectiveness of the biodeterioration of the flax/cotton nonwoven was evaluated based on a test of the susceptibility of materials to the action of soil microorganisms. The flax/cotton nonwoven layer was tested in terms of mechanical, physical, and biophysical properties, and an analysis of the covering of the nonwoven surface with fibers was conducted as well. The results confirmed that the structure of flax/cotton nonwovens is suitable to replace the nondegradable polypropylene layer of the face mask type II to improve its environmental performance