The influence of the structural characteristics of cotton and polyester knitted fabrics on the thermo-physiological comfort (original) (raw)
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Investigating thermophysiological comfort properties of polyester knitted fabrics
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Sport clothes are mainly produced from polyester yarn because of good wicking behaviour and moisture transfer properties of this yarn. In this paper, thermophysiological comfort properties of ring staple polyester, textured polyester and special type of polyester knitted fabrics, which is described as good moisture management property yarn by producer, were investigated. For this reason, thermal resistance, thermal absorptivity, thermal conductivity, air permeability and moisture managent properties of fabrics were tested. The results showed that, textured polyester yarn knitted fabrics were showed the highest air permeability values than moisture management polyester in same yarn count and knit structure. Lower filament number fabrics shows higher thermal resistance values in same yarn count of fabrics. Moisture management polyester knitted fabric (Type 10) showed the highest top absorption and one way transport index value. Also moisture management polyester yarn knitted fabrics, except Type 7, were showed very good moisture management properties according to MMT grading scale. This is most probably cross-sectional shape of this fiber.
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Effect of yarn properties on thermal comfort of knitted fabrics
International Journal of Thermal Sciences, 2007
In this research, thermal properties of 1×1 rib fabrics knitted by using various yarns of different properties were investigated with all details. The mentioned yarn properties were yarn count, yarn twist and combing process. The thermal resistance, thermal absorptivity, thermal conductivity, water vapour permeability of samples were measured with the aid of Alambeta and Permetest devices respectively. The results of the tests were evaluated statistically and the importance levels of the relationship between the measured parameters were determined. It is observed that yarn properties like yarn count, yarn twist and combing process of cotton have affected different thermal comfort properties of 1 × 1 rib knitted fabrics. While the yarn twist and yarn count increase thermal resistance values decrease and water vapour permeability values increase. The combing process has the same effect on the thermal properties.
4th International Scientific …, 2012
The term comfort is defined as "the absence of displeasure or discomfort" or "a neutral state compared to the more active state of pleasure". Clothing comfort includes three main considerations: psychological, sensorial and thermo-physiological comfort. The thermo-physiological comfort, entails both thermoregulation and moisture management. It is known that fiber type, yarn properties, fabric structure, finishing treatments and clothing conditions are the main factors affecting thermo-physiological comfort.In this paper, the influence of structural propertiesand characteristics of the fiber on the air and water vapor permeability, thermal properties (thermo-physiological comfort), of single jersey knitted fabricswas investigated.Thermal conductivity of knitted fabrics was determined according to new method of thermo-vision analysis developed by researchers. The main advantage of the method is the possibility of non contact determination of the temperature change rate coefficient of the knitted fabric. The results indicate more significant influence of structural characteristics on thermo-physiological comfort, compared with thecharacteristics of the fibers. Knitted fabric of 50/50%PAN/cottonwith the highest density and mass per unit areahas lower air and water vaporpermeability, thermal conductivity and higher thermal resistance compared with knitted fabrics of 100% wool and 100% PAN.
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The work reported in this paper is the resultant highlights of thermal properties of 100 % conventional cotton and 100% organic cotton based single jersey, 1×1 rib and interlock structures. The selected thermal properties of samples knitted fabric structured were measured. The results indicate that each knitted structure shows distinguished thermal comfort properties. Interlock and 1×1 rib fabrics have a greater thermal conductivity and thermal resistance value and thus better for winter garment products. On the other hand, single jersey fabrics of both conventional and organic cotton have greater moistures management properties with higher relative water vapour permeability values than 1×1 rib and interlock fabrics, and give a warmer feeling and hence more fruitful and could be chosen for active sports and summer apparel products.
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The main aim of this paper is evaluation of physiological Index of Comfort IC as a complex combination of individual fabrics properties connected with physiological comfort. The influence of the cotton fabrics structure on the selected parameters characterizing the physiological comfort of fabrics is investigated as well. The structural parameters of woven fabrics are collected into total volume porosity. Measurements of the thermal insulation parameters are performed by the sweating guarded hotplate test. Assessment of the air permeability is performed according to the procedure described in standard. The correlations between total volume porosity and above mentioned properties influencing the physiological comfort are investigated.
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In this study, three different woolen fabric samples having the same weight, composition and different thickness values have been investigated in terms of thermal comfort properties. Firstly, porosity of the fabrics has been calculated by using the warp/weft yarn counts and density values according to the theoretical model with cover factor. Then, thermal and water vapor resistance values have been measured by using PERMETEST Sensora instrument. Air permeability of fabrics has been measured by using a wind tunnel. The effects of porosity and thickness values on thermal comfort properties of fabrics have been discussed. Results proved that when the thickness increases the air permeability decreases. This situation can be explained with the structure effect of the fabric samples. In basket weave, because of the neat and dense character of the structure air permeability value is less than break twill structure. Considering the water vapor and thermal resistance values, because of the finest yarn count and the structure (twill) WB2 (wool blend) has the highest water vapor resistance result. This result is stemming from the fact that finer yarns have much more surface area to resist to the water vapor and thermal energy.
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In this work the thermal comfort parameters of the knitted fabrics made from new yarns generation were investigated. One of these yarns is "A Type" and it is tetra-channel polyester, which pulls or wicks moisture away from your skin to the outer layer of the fabric. Second yarn is "B Type" and it is a high functional polyester fibre designed with slots conduct to siphon effect. It draws moisture away from the skin promptly, transfers it to the outer layers. The last yarn is "C Type" which has a patented blend of natural and synthetic fibres. The natural fibres absorb moisture pulling it off the skin and into the fabric. Synthetic fibres repel moisture, forcing it through to the surface of the garment where it evaporates quickly as airflow moves across the fabric. Samples were produced in three different tightness values in order to obtain tight, medium and loose fabrics. The results indicate that the looser fabrics possess high insulation and high air permeability values, also give warmer feelings and the fabrics knitted using C Type yarns have the highest air permeability besides better thermal resistance values and they give warmer feeling with lower absorptivity values.
Applied Ergonomics, 2011
This study reports on an experimental investigation of physical properties on the textile thermal comfort. Textile properties, such as thickness, relative porosity, air permeability, moisture regain, thermal conductivity, drying time and water-vapour transmission rate have been considered and correlated to the thermal and vapour resistance, permeability index, thermal effusivity and moisture management capability in order to determine the overall comfort performance of underwear fabrics. The results suggested that the fibre type, together with moisture regain and knitted structure characteristics appeared to affect some comfort-related properties of the fabrics. Additionally, thermal sensations, temperature and skin wetness predicted by Caseto Ò software for three distinct activity levels were investigated. Results show that the data obtained from this model in transient state are correlated to the thermal conductivity for the temperature and to Ret, moisture regain and drying time for the skin wetness. This provides potential information to determine the end uses of these fabrics according to the selected activity level.