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1

Effect of Lycra Weight Percent and Loop Length on Thermo-physiological Properties of Elastic Single Jersey Knitted Fabric

Khalil Amany, Těšinová Pavla, Aboalasaad Abdelhamid R.R.

Autex Research Journal

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2022

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Vol. 22, no. 4

419--426

EN

The aim of this work is to estimate the effect of loop length and Lycra weight percent (Lwp) on the geometrical and thermo-physiological comfort of elastic plain knitted fabric. Fifty single jersey knitted fabric samples were produced at five levels of Lycra weight percent (Lwp) (4%, 5%, 6%, 7%, and 8%) and loop length (2.7 mm, 2.9 mm, 3.1 mm, 3.3 mm, and 3.4 mm) with full plaited (fp) and half plaited (hp) of bare Lycra. The thermo-physiological comfort properties (thermal conductivity, absorptivity, and water vapor permeability), air permeability, and geometrical properties were measured at standard of each one. The results showed that the elastic single jersey knitted fabric thickness ranged between 3.12 times and 4.2 times of the yarn diameter (d). The fabric thickness increased when loop length is increased and decreased when Lwp is increased. The thermal conductivity, absorptivity, and water vapor resistance (WVR) decreased with Lwp increasing.

2

Comfort-Related Properties of Double-Layered Woven Car Seat Fabrics

Ünal Pelin Gürkan, Kayseri Gonca Özçelik, Mecit Diren H.

Autex Research Journal

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2022

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Vol. 22, no. 3

272--281

EN

Seat upholstery fabrics for vehicles are crucial products as technical textiles in motor vehicles make up approximately 15% of the total manufactured technical textiles worldwide and more than 50% of the production belongs to the woven fabrics because of their appropriate properties for this application. The current work presents the comfort-related properties of the woven fabrics designed to be used in automotive seat upholstery. For this aim, double-layered woven fabrics were produced with four different process variables such as bottom layer pattern, number of interlacing warps in a unit report, number of interlacing picks per top warp, and number of weft skips by using Taguchi experimental design. Besides handle related properties, such as circular bending rigidity, surface roughness properties, and thermo physiological comfort related properties that include air permeability, thermal resistance, and moisture management properties were measured and analyzed based on Taguchi experimental analysis.

3

Approach to Performance Rating of Retroreflective Textile Material Considering Production Technology and Reflector Size

Glombikova Viera, Komarkova Petra, Vik Michal, Adamcova Jaroslava, Nemcokova Renata, Vikova Martina, Havelka Antonin

Autex Research Journal

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2022

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Vol. 22, no. 4

446--457

EN

The study investigates retroreflective fabrics’ efficiency from the point of view of the interaction of their visibility, thermo-physiological comfort properties, and durability (represented by physical-mechanical performance). The effect of the combination of two production technologies (reflective transfer films and screen printing method) and two reflector covering sizes (25% and 85%) was examined. Technique for order of preference by similarity to ideal solution (TOPSIS) method was used to determine the best solution considering the abovementioned tested categories of properties. Retroreflective performance was in congruence with the used design coverage factor of the tested pattern. It was found that retroreflection of the tested pattern produced using screen printing technology was significantly lower than retroreflection of an identical pattern made by a transfer film. On the contrary, in terms of thermo-physiological comfort and physical-mechanical performance of the tested samples, screen printing technology shows significantly better results in almost all tested properties, especially in water vapor permeability, moisture management, and physical-mechanical performance. The solution for the abovementioned contradictory results can be achieved by using a combination of the advantages associated with each of these technology methods. Screen printing can be applied to specific regions of clothing that are exposed to extreme loading or sweating, and the transfer of film elements ensures high visibility with respect to the standards and biomotion principles that are deployed as prevalent benchmarks in the industry.

4

Analyzing Thermophysiological Comfort and Moisture Management Behavior of Cotton Denim Fabrics

Eryuruk Selin Hanife

Autex Research Journal

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2021

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Vol. 21, no. 2

248--251

EN

Comfort properties of garments are influenced by fiber properties, fabric properties, and applied finishes. Denim garments are widely used apparels, and they are processed with different industrial finishing treatments. Finishing treatments and fabric weight have a great influence on the thermal comfort of denim fabrics. The aim of this paper was to evaluate the effects of finishing treatments (rigid, bleaching, resin, softener) on the thermophysiological comfort and moisture management properties of denim fabrics considering three weight categories (light, medium, heavy). The thermophysiological comfort (thermal resistance, thermal absorptivity, air permeability, water vapor permeability tests) and liquid moisture transport capabilities (transfer wicking and drying behavior of fabrics) were measured and analyzed statistically. As a result of the study, fabric weight and finishing had been found to be important parameters for the comfort properties of denim fabrics. As a conclusion, it could be stated in the light of the results that the fabric weight type (light, medium, heavy) had a significant impact on the fabric thermophysiological comfort properties.

5

Development and Investigation of a Textile Heating Element Ensuring Thermal Physiological Comfort

Padleckienė Ingrida, Stygienė Laimutė, Krauledas Sigitas

Fibres & Textiles in Eastern Europe

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2020

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Vol. 28, no. 5 (143)

56--62

EN

The aim of thisresearch wasto develop a flexible heating element and investigate its heating capability in simulated wearing conditions. Polyester silver (Ag)-plated yarns incorporated in the reverse side of the knitted structure were used to provide electrical conductivity. A special knitted structure was selected to keep conductive yarn only in the reverse side of the material. All the heating element was made using only textile materials and yarns. A temperature sensor thermistor was used as an electronic element to follow the body temperature, and the remaining elements ensuring a correct electric circuit and heating were made of textile. Another type of heating element was produced using enamelled copper wire, which was inserted into the knitted fabric structure. Investigation of both types of heating elements was made by determining the dependences of the heating elements’ temperatures on the current and voltage applied. It was concluded that the heating element with silver plated yarns used gave out warmth more evenly over all the resistive area. The microcontroller, which has a heating dynamics data storage function, was programmed to control the operations of the two heating elements. A model of an intelligent apparel product with two heating elements ensuring a comfortable microclimate for the user was created. Field tests were performer for the model created by wearing the product and setting the temperatures of both heating elements, for which the continuous operating time was determined.

PL

Celem badań było opracowanie elastycznego elementu grzejnego i zbadanie jego zdolności grzewczej w symulowanych warunkach zużycia. W celu zapewnienia przewodności elektrycznej zastosowano przędzę poliestrową pokrytą srebrem (Ag), umieszczoną na spodniej stronie dzianiny. Wybrano specjalną strukturę dzianiny, aby utrzymać przewodzącą przędzę tylko na spodniej stronie materiału. Cały element grzejny został wykonany wyłącznie z materiałów tekstylnych i przędz. Jako element elektroniczny do śledzenia temperatury ciała zastosowano termistor czujnika temperatury, a pozostałe elementy zapewniające prawidłowy obwód elektryczny i ogrzewanie wykonano z tkaniny. Inny rodzaj elementu grzejnego wykonano z emaliowanego drutu miedzianego, który został wprowadzony w strukturę dzianiny. Badania obu typów elementów grzejnych przeprowadzono poprzez określenie zależności temperatur elementów grzejnych od przyłożonego prądu i napięcia. Stwierdzono, że element grzejny z zastosowanymi przędzami posrebrzanymi oddawał ciepło bardziej równomiernie na całej powierzchni oporowej. Mikrokontroler, który posiada funkcję przechowywania danych dynamiki nagrzewania, został zaprogramowany do sterowania pracą dwóch elementów grzejnych. Powstał model inteligentnego produktu odzieżowego z dwoma elementami grzewczymi zapewniającymi komfortowy mikroklimat użytkownikowi. Testy terenowe wykonano dla modelu utworzonego poprzez noszenie produktu i ustawienie temperatur obu elementów grzejnych, dla których wyznaczono ciągły czas pracy.

6

Thermophysiological Comfort Properties of Polyamide Pantyhose

Tomovska Elena, Hes Lubos

Fibres & Textiles in Eastern Europe

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2019

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Vol. 27, no. 5 (137)

53--58

EN

In this paper, the thermophysiological characteristics of low weight knitted polyamide and polyamide/elastane fabrics for pantyhose differing in terms of filament count were studied. Alambeta and Permetest devices were used to measure the thermal conductivity, thermal resistance, thermal absorptivity, evaporative resistance and relative water vapour permeability. The results indicated that fabrics made of finer filaments have lower thermal conductivity, thermal resistance, thermal absorptivity and evaporative resistance values.

PL

W pracy zbadano właściwości komfortu termofizjologicznego rajstop poliamidowych, a także wpływ dodatku elstanu do struktury wyrobu. Przebadano 42 rodzaje rajstop. Przy zastosowaniu urządzeń Alambeta i Permetest dokonano pomiarów przewodności cieplnej, oporu cieplnego, absorpcji termicznej, odporności na parowanie i względnej przepuszczalności pary wodnej. Stwierdzono, że dodatek elastanu nieznacznie zmniejsza przewodność cieplną. Wszystkie badane wyroby wykazywały bardzo wysoką względną przepuszczalność pary wodnej i miały niską odporność na parowanie. Wysokie wartości względnej przepuszczalności pary wodnej są wskaźnikiem dobrego komfortu termofizjologicznego. Rajstopy są podstawą garderoby, jednak niska cena tych artykułów odzieżowych często oznacza, że ich właściwości są rzadko optymalizowane. Ponieważ komfort termofizjologiczny jest tylko jednym z czynników przyczyniających się do ogólnego komfortu, dalsze badania właściwości komfortu i estetyki mogą w przyszłości pomóc ulepszyć ten produkt.

7

Estimating the Effect of Torso Clothing Insulation on Body Skin and Clothing Temperatures in a Cold Environment Using Infrared Thermography

Angelova R. A., Georgieva E., Markov D., Bozhkov T., Simova I., Kehaiova N., Stankov P.

Fibres & Textiles in Eastern Europe

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2018

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Vol. 26, no. 4 (130)

122--129

EN

The study presents experiments, conducted with human subjects in an artificial cold chamber, assessing the influence of a cold environment on the temperature of the human body. Infrared thermography was applied as a non-invasive, contactless method for direct measurement of the temperature distribution of both clothed and uncovered parts of the body. Two subzero temperatures were applied and clothing ensembles with two different clothing insulation values were used to assess the effect of the clothing insulation of the torso on the temperature of clothed and uncovered parts of the body of the participants. The average temperature of the chest, back, upper arms, face and middle finger is presented and discussed in relation to the cold exposure duration and clothing insulation used. The results obtained showed the strong influence of the clothing insulation over the torso on skin and clothing temperatures of the body and overall cooling of the body in subzero temperatures.

PL

W artykule przedstawiono wyniki eksperymentów przeprowadzanych z ludźmi w sztucznej komorze chłodniczej. Oceniono wpływ zimnego otoczenia na temperaturę ciała człowieka. Termografia w podczerwieni została zastosowana jako nieinwazyjna, bezdotykowa metoda bezpośredniego pomiaru rozkładu temperatury zarówno zabezpieczonych odzieżą, jak i niezabezpieczonych części ciała człowieka. Zastosowano dwie temperatury ujemne i zestawy odzieżowe o dwóch różnych wartościach izolacji w celu oceny wpływu izolacji odzieży na temperaturę ubranych i niezabezpieczonych części ciała uczestników. Przedstawiono i omówiono średnią temperaturę klatki piersiowej, pleców, ramion, twarzy i środkowego palca w odniesieniu do czasu trwania ekspozycji na zimno i izolacji zastosowanej odzieży.

8

Effect of Air Gap Entrapped in Firefighter Protective Clothing on Thermal Resistance and Evaporative Resistance

He H., Yu Z.

Autex Research Journal

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2018

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Vol. 18, no. 1

28--34

EN

Heat and water vapor transfer behavior of thermal protective clothing is greatly influenced by the air gap entrapped in multilayer fabric system. In this study, a sweating hot plate method was used to investigate the effect of air gap position and size on thermal resistance and evaporative resistance of firefighter clothing under a range of ambient temperature and humidity. Results indicated that the presence of air gap in multilayer fabric system decreased heat and water vapor transfer abilities under normal wear. Moreover, the air gap position slightly influenced the thermal and evaporative performances of the firefighter clothing. In this study, the multilayer fabric system obtained the highest thermal resistance, when the air space was located at position B. Furthermore, the effect of ambient temperature on heat and water vapor transfer properties of the multilayer fabric system was also investigated in the presence of a specific air gap. It was indicated that ambient temperature did not influence the evaporative resistance of thermal protective clothing. A thermographic image was used to test the surface temperature of multilayer fabric system when an air gap was incorporated. These results suggested that a certain air gap entrapped in thermal protective clothing system could affect wear comfort.

9

Selection of Clothing for a Cold Environment by Predicting Thermophysiological Comfort Limits

Angelova R. A., Georgieva E., Reiners P., Kyosev Y.

Fibres & Textiles in Eastern Europe

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2017

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Vol. 25, no. 1 (121)

95--101

EN

Results are presented from a study on the prediction of the insulation abilities of outerwear clothing for cold protection from the point of view of the thermophysiological comfort of the wearer. The Required Clothing Insulation (IREQ) index is used to simulate the abilities of 14 assemblies of layers designed for the production of winter jackets to protect the body in different cold environments. The calculations allow to assess the limits of applicability of the garments in terms of the thermophysiological comfort assured, the activities performed and the weather conditions. Discussions are presented on the correspondence between ISO11079:2007 and the online JavaScript code for calculation of IREQ based on it. The results predicted and their analysis have a practical use, as they allow to estimate the cold protection effectiveness of the textile layers used in an assembly at the design stage, thusgiving room for necessary changes depending on the conditions of its use.

PL

Wykorzystano wskaźnik IREQ (required clothing insulation – wymagana ciepłochronność odzieży) do symulacji zdolności termicznej 14 zestawów warstw przeznaczonych do produkcji kurtek zimowych chroniących organizm w niskich temperaturach. Obliczenia te pozwalają ocenić ograniczenia zastosowania odzieży przy założeniu wymaganego komfortu termofizjologicznego, przy określonej aktywności użytkowników i w danych warunkach pogodowych. Uzyskane wyniki badań skorelowano z obowiązującymi normami. Wyniki badań mają praktyczne zastosowanie, gdyż pozwalają ocenić skuteczność ochrony przed zimnem danych zestawów warstw tekstylnych na etapie projektowania ubioru, przed sprawdzeniem gotowego wyrobu w praktyce.

10

Moisture transmission through textiles. Part II: Evaluation methods and mathematical modelling

Das B., Das A., Kothari V. K., Fanguiero R., Araújo M.

Autex Research Journal

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2007

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Vol. 7, no. 3

194--216

EN

The moisture transmission behaviour of a clothing assembly plays a very important role in influencing its efficiency with respect to thermophysiological body comfort. This paper is in two parts. Part I deals with the processes involved in moisture transmission and the factors at play. Part II is concerned with selecting the measurement techniques which are of great importance in determining fabric factors that influence comfort. The instruments and methods used for testing purposes should adequately simulate the exact conditions for which the fabric will be used, in order to determine the effectiveness of that fabric for a particular wearing situation and environmental condition. The testing methods used and the apparatus developed by different researchers for determining moisture transmission through textiles by different mechanisms are discussed in this paper. Moreover, this part of the paper deals with the mathematical models of liquid and vapour transport through textile materials developed by several scientists in order to understand the exact phenomena involved and to predict the factors affecting the transmission under a particular condition.

11

Moisture transmission through textiles. Part I: Processes involved in moisture transmission and the factors at play

Das B., Das A., Kothari V. K., Fanguiero R., Araújo M.

Autex Research Journal

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2007

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Vol. 7, no. 2

100--110

EN

Moisture transmission through textiles has a great influence on the thermo-physiological comfort of the human body which is maintained by perspiring both in vapour and liquid form. The clothing to be worn should allow this perspiration to be transferred to the atmosphere in order to maintaining the thermal balance of the body. Diffusion, absorption-desorption and convection of vapour perspiration along with wetting and wicking of liquid perspiration play a significant role in maintaining thermo-physiological comfort. The scientific understanding of the processes involved in moisture transmission through textiles and the factors affecting these processes are important to designing fabrics and clothing assemblies with efficient moisture transfer in different environment and workload conditions. This paper is in two parts.Part I focuses on the moisture transmission through textile materials and it discusses the processes involved in moisture transmission and the key influencing factors at play to maintaining comfort. It is underlined that the processes which play the major role in moisture transmission in a particular situation are dependant on the moisture content of the fabric, the type of material used, the perspiration rate and the atmospheric conditions, such as humidity, temperature and wind speed. Part II is concerned with the selection of the measurement techniques which are of great importance in determining fabric factors that influence comfort. The instruments and methods used for testing purposes should adequately simulate the exact conditions for which the fabric will be used, in order to determine the effectiveness of that fabric for a particular wearing situation and environmental condition. The testing methods used and the apparatus developed by different researchers for determining moisture transmission through textiles by different mechanisms are discussed in this paper. Moreover, this part of the paper deals with the mathematical models of liquid and vapour transport through textile materials developed by several scientists in order to understand the exact phenomena involved and to predict the factors affecting the transmission under a particular condition. When designing the comfort of a clothing product for a particular application, the requirements may result from needs concerning the application, the individual wearer and the environmental conditions.