A Study of Thermal Properties of Commercially Available Innerwear

2016 ◽  
Vol 848 ◽  
pp. 178-181 ◽  
Author(s):  
Chi Wai Kan ◽  
Hiu Tung Tam ◽  
Rattanaphol Mongkholrattanasit
Keyword(s):  
Thermal Properties ◽  
Evaluation System ◽  
Air Permeability ◽  
Fibre Content

In this study, three commercially available innerwears were collected from the market. Their air permeability and thermal properties were evaluated by Kawabata Evaluation System for Fabric (KES-F). Exerimental results revealed that the fibre content played an important role in affecting the air permeability and the thermal properties of the innerwears.

scholarly journals Effect of Using Hybrid Polypropylene and Glass Fibre on the Mechanical Properties and Permeability of Concrete

Materials ◽  
2019 ◽  
Vol 12 (22) ◽  
pp. 3786 ◽  
Author(s):  
Abubaker A. M. Ahmed ◽  
Yanmin Jia
Keyword(s):  
Mechanical Properties ◽  
Reinforced Concrete ◽  
Glass Fibre ◽  
Single Fibre ◽  
Air Permeability ◽  
Fibre Content ◽  
Peak Performance ◽  
Fibre Reinforced Concrete ◽  
Performance Limit ◽  
Hybrid Fibre

A comprehensive program of experiments consisting of compression, uniaxial compression, direct shear, flexural as well as splitting tensile and air permeability tests were performed to analyse the effect of the level of fibre dosage and the water–cement ratio on the physical properties of hybrid fibre-reinforced concrete (HFRC). Two types of fibres were studied in terms of their effect on the properties of HFRC. The results indicated that the mechanical properties of concrete were significantly improved by increasing the fibre content. However, increasing the percentage fibre content past a certain peak performance limit (0.9% glass fibre (GF) and 0.45% polypropylene fibre (PPF)) led to a decrease in strength compared to reference mixes. Additionally, the incorporation of hybrid fibres yielded an increase in air permeability in the tested specimens. The results showed that the strength-related properties of HFRC were superior to the properties of single fibre-reinforced concrete.

EFFECT OF SURFACE TREATMENT ON THE PROPERTIES OF WOOL FABRIC

2007 ◽  
Vol 14 (04) ◽  
pp. 559-563 ◽  
Author(s):  
C. W. KAN ◽  
C. W. M. YUEN ◽  
C. K. CHAN ◽  
M. P. LAU
Keyword(s):  
Mechanical Properties ◽  
Thermal Properties ◽  
Fiber Surface ◽  
Air Permeability ◽  
Wool Fiber ◽  
Wool Fabric ◽  
Physical Treatment ◽  
Temperature Plasma ◽  
Technical Problems ◽  
Chemical Treatments

Wool fiber is commonly used in textile industry, however, it has some technical problems which affect the quality and performance of the finished products such as felting shrinkage, handle, lustre, pilling, and dyeability. These problems may be attributed mainly in the presence of wool scales on the fiber surface. Recently, chemical treatments such as oxidation and reduction are the commonly used descaling methods in the industry. However, as a result of the pollution caused by various chemical treatments, physical treatment such as low temperature plasma (LTP) treatment has been introduced recently because it is similarly capable of achieving a comparable descaling effect. Most of the discussions on the applications of LTP treatment on wool fiber were focused on applying this technique for improving the surface wettability and shrink resistance. Meanwhile, little discussion has been made on the mechanical properties, thermal properties, and the air permeability. In this paper, wool fabric was treated with LTP treatment with the use of a non-polymerizing gas, namely oxygen. After the LTP treatment, the fabrics low-stress mechanical properties, air permeability, and thermal properties were evaluated and discussed.

Effects of finishing on the mechanical and thermal properties of fabrics from wool and hollow polyester fibres

2011 ◽  
Vol 81 (19) ◽  
pp. 2006-2016 ◽  
Author(s):  
Akbar Khoddami ◽  
Mohammad I Soleimani ◽  
Hugh Gong
Keyword(s):  
Thermal Properties ◽  
Water Vapour ◽  
Polyester Fibre ◽  
Air Permeability ◽  
Hollow Fibre ◽  
Water Vapour Permeability ◽  
Mechanical And Thermal Properties ◽  
Shear Rigidity ◽  
Vapour Permeability ◽  
Hollow Fibres

The effects of finishing steps on hollow and solid polyester/wool have been studied in order to establish the processing behaviour and performance characteristics of fabrics from these fibres. The effect of hollow fibres on fabric tensile strength, pilling, and crease recovery were studied. In addition, the water vapour permeability, air permeability, thermal properties and fabric handle were investigated. The results show that finishing has no adverse effects on fabric strength. By using hollow fibres in the fabrics, the extent of pilling was reduced. Among the different steps of finishing, scouring has the most significant effect on fabric hand due mainly to the large reduction in both bending, and shear rigidity and hysteresis. The results on crease recovery, water vapour permeability and air permeability revealed that the fabric properties are more affected by the fabric structure than the type of polyester fibre. In addition, while the hollow fibre fabrics always have lower thermal conductivity than similar fabrics with solid polyester fibres, their thermal properties are greatly affected by the dyeing process.

scholarly journals Impact of Weft Yarn Density and Core-yarn Fibre Composition on Tensile Properties, Abrasion Resistance and Air Permeability of Denim Fabrics

2021 ◽  
Author(s):  
Nele MANDRE ◽  
Tiia PLAMUS ◽  
Andres KRUMME
Keyword(s):  
Tensile Properties ◽  
Abrasion Resistance ◽  
Polyester Fibre ◽  
Air Permeability ◽  
Fibre Content ◽  
Woven Fabric ◽  
Weft Yarn ◽  
The Core ◽  
Core Yarn ◽  
The Impact

Characteristics and serviceability of denim fabrics have undergone major changes. Nowadays denim is commonly used for casual wear. Durability and comfort are important parameters for consumers when choosing a denim garment. Therefore, in this study, abrasion resistance, tear and tensile properties of core–spun yarns and air permeability of denim fabrics with different weft yarns per centimetre and fibre content were analysed. The test results showed that weft yarns per centimetre influences fabric air permeability negatively but abrasion resistance increases. Higher weft yarns per centimetre influences fabric air permeability negatively but abrasion resistance increases. Polyester, elastane, modal, viscose and Lycra T400 were used in the core of weft yarn to analyse the impact of those fibres on the durability and comfort properties. Elastane is used to add stretchability to the fabric, which provides comfort to the wearer. The higher the elastomeric fibre content in the fabric, the greater is its elasticity; however, the tensile properties of the woven fabric decrease. The tear strength of the fabric was increased by the presence of the polyester fibre in the core.

scholarly journals ASSESSMENT OF ACOUSTIC AND THERMAL PROPERTIES OF AIRTIGHT WOODEN WINDOWS USED IN BALTIC AND SCANDINAVIAN COUNTRIES

2019 ◽  
Vol 27 (3) ◽  
pp. 135-143 ◽  
Author(s):  
Kęstutis Miškinis ◽  
Raimondas Bliūdžius ◽  
Vidmantas Dikavičius ◽  
Arūnas Burlingis
Keyword(s):  
Thermal Properties ◽  
Thermal Insulation ◽  
Air Permeability ◽  
Building Envelope ◽  
Acoustic Properties ◽  
Thermal Transmittance ◽  
Air Tightness ◽  
The One ◽  
Sound Reduction ◽  
Reduction Index

Windows are the one of the most important elements of a building envelope. Windows with appropriate acoustic and thermal properties can guarantee comfort and protection of indoor environment. The sound and thermal insulation of windows are influenced by various factors and one of them is air tightness. The aim of this study was to assess if airtight typical wooden windows used in Baltic and Scandinavian countries always have both good acoustic and thermal properties. For this purpose, sound reduction index (characterizes acoustic properties), thermal transmittance (characterizes thermal insulation properties) and air permeability (characterizes air tightness) of windows were determined in the laboratory. The results showed that airtight windows have various acoustic and thermal properties. This means that there is a negligible relationship between air permeability and acoustic properties, also between air permeability and thermal properties of windows.

scholarly journals Comparison of air permeability and thermal properties of loose mineral wool and hemp fibers

2020 ◽  
Author(s):  
Piotr Kosiński ◽  
Przemysław Brzyski ◽  
Zbigniew Suchorab ◽  
Grzegorz Łagód
Keyword(s):  
Thermal Properties ◽  
Air Permeability ◽  
Mineral Wool ◽  
Hemp Fibers

Extraction and characterization of palm fibers and their use to produce wool- and polyester-blended nonwovens

2019 ◽  
pp. 152808371987700 ◽  
Author(s):  
Laila Sajid ◽  
Oussama Azmami ◽  
Zakia El ahmadi ◽  
Abbès Benayada ◽  
Said Gmouh
Keyword(s):  
Thermal Conductivity ◽  
Tensile Strength ◽  
Thermal Properties ◽  
Chemical Composition ◽  
Physical Properties ◽  
Structural Properties ◽  
Surface Density ◽  
Air Permeability ◽  
Mechanical And Physical Properties

The aim of this work is the production of new nonwovens materials based on wool, polyester and palm fibers ( Washingtonia). The extraction of palm fibers was achieved by the combination of alkaline and bleaching treatments. Chemical composition, mechanical and physical properties of the extracted fibers were first determined. Then, two types of blended nonwovens based on Palm/Wool (P/W) and Palm/Polyester (P/PES) mixtures were produced using the needling technique. The physical and structural properties of produced nonwovens were studied such as surface density, tensile strength, porosity and thermal properties. The results showed that the porosity lies between 83.81% and 86.93% for (P/W) mixtures and between 78.01% and 86.93% for (P/PES) mixtures. The air permeability was found to be between 61.56 m3.m−2.min−1 and 129.01 m3.m−2.min−1 for P/W blend nonwovens and between 22.75 m3.m−2.min−1 and 129.01 m3.m−2.min−1 for P/PES blend ones. The thermal conductivity varies between 36.45 mW/m.K and 43.88 mW/m.K for P/W nonwovens and between 36.45 mW/m.K and 47.70 mW/m.K for P/PES nonwovens. Moreover, the tensile strength of blended nonwovens is found to be higher than that of non-blended ones.

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