scholarly journals Effect of Air Permeability and Water Vapor Permeability upon Simultaneous Heat and Mass Transfer in Simulated Clothing Systems.

1998 ◽  
Vol 54 (9) ◽  
pp. 443-451 ◽  
Author(s):  
Takako Fukazawa ◽  
Yayoi Satsumoto ◽  
Masaaki Takeuchi ◽  
Kinzo Ishikawa
Keyword(s):  
Mass Transfer ◽  
Water Vapor ◽  
Heat And Mass Transfer ◽  
Water Vapor Permeability ◽  
Air Permeability ◽  
Vapor Permeability ◽  
Simultaneous Heat

Heat and mass transfer through outerwear clothing for protection from cold: influence of geometrical, structural and mass characteristics of the textile layers

2016 ◽  
Vol 87 (9) ◽  
pp. 1060-1070 ◽  
Author(s):  
Radostina A Angelova ◽  
Priscilla Reiners ◽  
Elena Georgieva ◽  
Hristina Plamenova Konova ◽  
Bianca Pruss ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Water Vapor ◽  
Heat And Mass Transfer ◽  
Unit Area ◽  
Water Vapor Permeability ◽  
Woven Fabric ◽  
Vapor Permeability ◽  
Regression Equations ◽  
Moisture Management ◽  
Transfer Properties

This paper presents a comprehensive experimental study, conducted on a series of woven and non-woven fabric samples from different materials (cotton, polyester, and polyamide) and 14 three-layer systems of textile materials, used for production of outerwear clothing for protection from cold. Heat and mass transfer properties, related to the thermophysiological comfort of the outerwear clothing, namely conductive thermal resistance, water vapor resistance, relative water vapor permeability, air permeability, accumulative one-way transport of liquids, and overall moisture management capacity, were determined for the system of layers and the compound single layers. The transfer properties of the single layers were presented as a function of their thickness, mass per unit area, and areal porosity. The transfer properties of the system of layers were presented as a function of the thickness, mass per unit area, and bulk density of the systems. Regression analysis was applied to derive regression equations. The results obtained allowed assessment of the existence and trend of the influence, as well as evaluation of the strength of the dependences.

scholarly journals Characteristics of Knitted Structures Produced by Engineered Polyester Yarns and Their Blends in Terms of Thermal Comfort

2015 ◽  
Vol 10 (1) ◽  
pp. 155892501501000 ◽  
Author(s):  
Nida Oğlakcioğlu ◽  
Ahmet Çay ◽  
Arzu Marmarali ◽  
Emel Mert
Keyword(s):  
Water Vapor ◽  
Thermal Comfort ◽  
Moisture Transfer ◽  
Water Vapor Permeability ◽  
Air Permeability ◽  
Vapor Permeability ◽  
Moisture Management ◽  
Thermal Comfort Properties ◽  
Knitted Structure ◽  
Drying Properties

Engineered yarns are used to provide better clothing comfort for summer garments because of their high levels of moisture and water vapor management. The aim of this study was to investigate the characteristics of knitted structures that were produced using different types of polyester yarns in order to achieve better thermal comfort properties for summer clothing. However they are relatively expensive. Therefore, in this study engineered polyester yarns were combined with cotton and lyocell yarns by plying. This way, the pronounced characteristics of these yarns were added to the knitted structure as well. Channeled polyester, hollow polyester, channeled/hollow blended polyester, cotton, and lyocell yarns were plied with each other and themselves. Then, single jersey structures were knitted using these ply yarn combinations and air permeability, thermal resistance, thermal absorptivity, water vapor permeability, moisture management, and drying properties were tested. The results indicate that channeled PES fabrics are advantageous for hot climates and high physical activities with regards to high permeability and moisture transfer and also to fast drying properties. Besides, air permeability and thermal properties improved through the combination of lyocell yarn with engineered polyester yarns. However, the use of lyocell or cotton with engineered yarns resulted in a to a decrease in moisture management properties and an increase in drying times

Influence of Coolmax Fiber Content on Comfortable Properties of Cotton/Coolmax Weft-Varied Fabric

2014 ◽  
Vol 556-562 ◽  
pp. 154-157
Author(s):  
Jin Ming Lu
Keyword(s):  
Water Vapor ◽  
Sorption Property ◽  
Moisture Sorption ◽  
Water Vapor Permeability ◽  
Air Permeability ◽  
Fiber Content ◽  
Vapor Permeability ◽  
Regression Equations ◽  
Capillary Effect

The moisture sorption property, air permeability, capillary effect property of five kinds of Coolmax weft-varied fabric were tested. Meanwhile,the regression equations of Coolmax fiber content with warp wicking height,weft wicking height,water vapor permeability and air permeability were also established. The result showed that the moisture sorption property and air permeability,capillary effect property of cotton/Coolmax weft-varied fabrics are better with the increase of Coolmax fiber in the weft.

scholarly journals Moisture and Thermal Transport Properties of Different Polyester Warp-Knitted Spacer Fabric for Protective Application

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Qing Chen ◽  
Dahua Shou ◽  
Rong Zheng ◽  
Ka-Po Maggie Tang ◽  
Bailu Fu ◽  
...  
Keyword(s):  
Water Vapor ◽  
Water Absorption ◽  
Thermal Insulation ◽  
Water Vapor Permeability ◽  
Volume Density ◽  
Air Permeability ◽  
High Mass ◽  
Vapor Permeability ◽  
Spacer Fabric ◽  
Spacer Fabrics

AbstractWarp-knitted spacer fabrics are generally used for sportswear, functional clothing, protective clothing, and other applications. This article studied the heat and mass transfer properties of polyester warp-knitted spacer fabrics from low thickness (2 mm) to high thickness (20 mm), from low mass (247.34 g/m2) to high mass (1,585.9 g/m2), and surface structure in plain or mesh construction. Water vapor permeability, air permeability, water absorption, and thermal insulation property were conducted to evaluate the spacer fabrics. The results revealed that with increasing volume density the water vapor permeability of spacer fabrics decreased, but the water absorption ratio increased. The water vapor permeability of fabrics increased when thickness decreased and volume density increased. It was further found that spacer fabrics with mesh worn nearby the skin and plain structure worn far from the skin could facilitate water vapor and air transmission. The difference of 8.82% for water vapor permeability and 14.19% for air permeability were found between testing mesh side up and down for the spacers (2.56 and 3.37 mm), respectively. Thermal insulation ratio was highly and significantly correlated with heat transfer coefficient at −0.958 and with thickness at 0.917. Thermal insulation ratio is highly and significantly correlated with air permeability at 0.941.

scholarly journals Thermal resistance testing of standard and protective filtering military garment on the burning napalm mixture

2013 ◽  
Vol 67 (6) ◽  
pp. 941-950 ◽  
Author(s):  
Dusan Rajic ◽  
Zeljko Kamberovic ◽  
Radovan Karkalic ◽  
Negovan Ivankovic ◽  
Zeljko Senic
Keyword(s):  
Water Vapor ◽  
Thermal Resistance ◽  
Active Carbon ◽  
Thermal Protection ◽  
Water Vapor Permeability ◽  
Air Permeability ◽  
Resistance Testing ◽  
Vapor Permeability ◽  
Military Uniform ◽  
Sandwich Materials

Fires are an accompanying manifestation in modern weaponry use and in case of different accidents in peacetime. The standard military uniform is a primary barrier in protection of a soldier?s body from all external influences, including the thermal ones which can cause burns. The minimum thermal resistance to the effect of burning napalm mixture (BNM) in individual uniform garment materials has been determined, and is higher at simultaneous use of more materials one over another (the so-called sandwich materials), where the best thermal protection give sandwich materials with an air interspace. The requirement for the thermal resistance of the material of the filtrating protective suit (FPS) to the effect of BNM (? 15 s) has been fully met. The highest thermal resistance has been demonstrated by the FPS whose inner layer is made of polyurethane foam with active carbon. A proportional dependence between the thermal resistance of FPS to the effect of BNM and water vapor permeability through this garment mean has been determined, and reversed in respect to air permeability.

Gray Cluster Analysis on Thermal-Moisture Comfort of Bamboo Fiber Socks

2011 ◽  
Vol 295-297 ◽  
pp. 2041-2044
Author(s):  
Wei Zhang ◽  
Zhi Liu
Keyword(s):  
Cluster Analysis ◽  
Water Vapor ◽  
Water Vapor Permeability ◽  
Well Being ◽  
Air Permeability ◽  
Bamboo Fiber ◽  
Cotton Fibers ◽  
Vapor Permeability ◽  
Bamboo Fibers ◽  
Better Than

8 kinds of blended knitted socks with different materials of nylon filament, bamboo and cotton fibers are taken as research objectives with a view to investigating the thermal-moisture comfort of bamboo fiber socks. The sense of well-being, thermal conductivity, moisture regain, water vapor permeability, wicking height and air permeability of the socks are tested, and the thermal-moisture comfort of socks with different fiber contents are studied. By using the gray cluster analysis, the integrated evaluation of thermal-moisture comfort of the socks is conducted. The results shows that the socks containing bamboo fibers have better warm-retention and water vapor transmission properties, their thermal-moisture comfort are better than that of nylon filament and cotton fibers in summer.

Performance of Pearl-Fiber Blended Wrinkle-Free Fabric

2011 ◽  
Vol 332-334 ◽  
pp. 347-350
Author(s):  
Jin Zhong Zhu ◽  
Qin Ma ◽  
Jun Ying Zhang
Keyword(s):  
Water Vapor ◽  
Moisture Absorption ◽  
Performance Testing ◽  
Water Vapor Permeability ◽  
Air Permeability ◽  
Vapor Permeability ◽  
High Grade ◽  
Pearl Fiber

To better understand and perform of using pearl fiber characteristics, improve the development of targeted clothing, based on the fabric common performance such as comfort, wrinkle-free performance and safety in this article, to carry out the performance testing for 65/35 two-ply cotton / pearl plain jacquard imitating silk high-grade wrinkle-free fabric, in which mainly test the fabric moisture absorption, water vapor permeability, air permeability, anti-crease, security. Then concluded that the wrinkle-free performance of the 65/35 two-ply cotton / pearl plain jacquard imitating silk high-grade fabric is good, and the fabric has good wearability and value.

The effects of the combined process of enzymatic bleach clean-up, enzymatic defibrillation and dyeing on the comfort and physical properties of Tencel/cotton knitted fabrics

2019 ◽  
Vol 90 (9-10) ◽  
pp. 1118-1129
Author(s):  
Sibel Şardağ ◽  
Tuba Toprak ◽  
Pervin Aniş
Keyword(s):  
Thermal Conductivity ◽  
Water Vapor ◽  
Physical Properties ◽  
Water Vapor Permeability ◽  
Lower Surface ◽  
Air Permeability ◽  
Vapor Permeability ◽  
Knitted Fabrics ◽  
Single Bath ◽  
Loss Of Mass

This study aimed to investigate the comfort and physical properties of raw and finished knitted fabrics made of yarns with different Tencel/cotton blend ratios. For this purpose, Ne 20 yarns were produced with the same twist coefficient on the same production line. Fabric samples were produced on the same knitting machine. The raw fabrics were subjected to two different combined enzymatic pre-treatments and dyeing processes. In the first process, enzymatic defibrillation and dyeing were carried out in the same bath. In the second, enzymatic bleach clean-up, defibrillation and dyeing were conducted in the same bath. The comfort and physical properties of all the raw and finished fabric samples were measured according to the relevant standards. The results were assessed statistically. The results of this study showed that with increased percentage of Tencel in the blend, the water vapor and air permeability, fabric roughness, pilling, thermal absorption and loss of mass values of the fabrics increased, whereas thermal conductivity values decreased. It was observed that the fabrics which were subjected to enzymatic defibrillation and dyeing processes in a single bath gave lower surface roughness and abrasion values but higher air permeability values; while those subjected to enzymatic bleach clean-up, defibrillation and dyeing in a single bath gave higher thermal conductivity and thermal absorptivity values. Comparison of the two processes showed that there were no significant differences in the pilling and the water vapor permeability values obtained from both processes.

scholarly journals A comparative study on the performance properties of breathable and non-breathable baby diaper back sheet

2018 ◽  
Vol 12 (2) ◽  
pp. 74-78
Author(s):  
Seval Uyanik ◽  
Hatice Kübra Kaynak
Keyword(s):  
Water Vapor ◽  
Water Resistance ◽  
Water Vapor Permeability ◽  
Air Permeability ◽  
Vapor Permeability ◽  
Performance Properties ◽  
Disposable Diapers ◽  
Positive Effect ◽  
Absorbent Layer ◽  
Film Composites

Disposable diapers are very important in terms of babies’ health because they are in touch with the baby’s skin. Disposable diapers have sheets with different functions from each other. The main layers of disposable diapers are as follows: top sheet, absorbent layer and back sheet. The function of the top sheet is to pass the liquid to the lower absorbent layer whereas the function of the absorbent layer is to absorb the liquid. As for the back sheet, this layer keeps the liquid inside and prevents it from leaving the diaper. The back sheet is usually a nonwoven/ polyethylene (PE) film composite. Considering the babies’ health, breathable back sheets are mostly used in baby diapers to keep the skin drier. These have a positive effect on the baby’s skin, especially in terms of occlusion, diaper dermatitis. In this study, the performance properties of some commercial baby diaper back sheet layers have been investigated. For this purpose, weight, thickness, air permeability, water vapor permeability and water resistance tests were applied to back sheet samples with different fabric mass as breathable and non-breathable films. All back sheet samples are SMS nonwoven/ polyethylene (PE) film composites. Breathable samples have a larger fabric mass than non-breathable samples. For breathable samples, while increasing mass, air permeability and water vapor permeability decrease, water resistance increases. On the other hand, the same tendency is not seen in non-breathable samples. Breathable samples have higher air permeability, water vapor permeability, water resistance, and bursting strength than non-breathable samples. Consequently, the using of a baby diaper containing breathable back sheet is more proper in terms of baby’s skin health.

Sign in / Sign up

Export Citation Format

Share Document