New Method and Equipment for Measuring Thermal Properties of Textiles

Hes, Luboš; Dolezal, Ivan

doi:10.4188/transjtmsj.42.8_t124

Cited by 87 publications

(57 citation statements)

References 1 publication

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“…As the heat flow stabilizes with time, the stabilized heat flow quoted as stationary heat flow density q s . The q max is used to characterize the thermal insulation behaviour that is similar to thermal absorbability as defined by Hes and Dolezal (1989). The value of q max is higher in modified cross-sectional fabric and maximum q max is registered with deep groove multilobal cross-sectional fabric (i.e.…”

Section: Peak Heat Flow Density (Q Max ) Of Fabricmentioning

confidence: 99%

“…Matsudaira, Tan, and Kondo (1993) has also coined a term "Polymer to free space ratio" in case of different cross-sectional shape of polyethylene terephthalate (PET) fibre during a research aimed to fabric handle. Hes and Dolezal (1989) and Kawabata (2000) introduced the terms "thermal absorption" and "warm-cool feeling" of textiles to understand its first sense with human skin. In addition, the wetting and wicking process become crucial, especially during wet processing, finishing and the wearing.…”

Section: Introductionmentioning

confidence: 99%

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Role of filament cross-section in properties of PET multifilament yarn and fabric. Part I: Effect of fibre cross-sectional shape on transmission behaviour of fabrics

Behera¹,

Singh²

2014

The Journal of The Textile Institute

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The transmission property of a fabric is a key factor that affects clothing's comfort and decides the functional potential of clothing. The dependence of filament cross-section with varying shape factor (SF) on air, moisture and thermal transmission behaviour of fabric is determined in case of polyester multifilament woven fabrics. The linear density of each filament is kept identical for all 12 cross-section shape filaments. The SF of filament cross-section is an important factor which remained the prime factor to influence the transmission behaviour of fabric samples directly in many cases. Other indirect factors that influence the transmission behaviour of fabrics when the SF is identical are yarn structure, inter-fibre and inter-yarn space. Twelve different novel cross-sectional shapes are considered to make the multifilament woven polyester fabrics. The fabrics made from multifilament yarns having different SFs show that relative moisture vapour permeability and air permeability decrease with the rise in SF. Wickability increases with the rise in the SF of a filament cross-section. Multilobal, hexalobal and plus shapes were made a part of novel cross-sectional shapes in order to develop fabrics of higher comfort index.

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Section: Peak Heat Flow Density (Q Max ) Of Fabricmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Role of filament cross-section in properties of PET multifilament yarn and fabric. Part I: Effect of fibre cross-sectional shape on transmission behaviour of fabrics

Behera¹,

Singh²

2014

The Journal of The Textile Institute

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“…Yoneda and Kawabata were the first, who measured successfully this parameter, using their measuring system THERMO-LABO (Yoneda and Kawabata 1983). In 1990, another measuring instrument for the evaluation of warm-cool feeling of fabrics appeared on the market, under commercial name ALAMBETA (Hes 1987;Hes and Dolezal 1989).…”

Section: Introductionmentioning

confidence: 99%

Thermal Comfort of Bedsheets Under Real Conditions of Use

Hes

Bogusławska-Bączek

Geraldes

2014

Journal of Natural Fibers

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Thermal comfort properties of various fabrics in dry state were systematically studied by many authors, but papers on thermal comfort properties under real conditions of use are sporadic in the professional literature. In this paper, thermal conductivity, thermal resistance, water vapor permeability, and thermal absorbtivity in dry and wet state of commercial cotton, cotton/PU, and cotton/PES bedsheets are presented. The samples were wetted by means of the so-called sweating impulse. It was found that the warmer (dryer) contact feeling and highest thermal insulation in wet state exhibited knitted cotton bedsheets containg some percentage of PU or PES, and also 100% cotton woven fabrics with hairy surface.

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“…The lower part of the heated block is equipped with a direct heat flow sensor which measures the thermal drop between the surfaces of a very thin, non-metallic plate using a multiple differential micro-thermocouple [20]. Each specimen was tested five times and the results were averaged.…”

Section: Measurement Of Thermal Propertiesmentioning

confidence: 99%

Study on Sound Absorption Performance and Transmission Behavior of Perpendicular-laid Nonwovens

Yang¹

2017

JFBI

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This work deals with the study of acoustic performance of perpendicular-laid nonwovens and their relation to fabric air permeability and thermal properties. Seven perpendicular-laid nonwoven fabrics were selected to examine sound absorption like average values of sound absorption coefficients (α) and noise reduction coefficient (NRC) as well as air permeability and thermal insulation properties. The Brüel and Kjaer impedance tube instrument, Alambeta and FX3300 Air Permeability Tester were used for evaluation of acoustic, thermal and air permeability properties, respectively. It was observed that sound absorption had insignificant correlation with thermal conductivity while it was strongly correlated with thermal resistance. And the correlation coefficient of NRC and thermal resistance was 0.9835, indicating that NRC was directly proportional to thermal resistance of perpendicular-laid nonwovens. It also was observed that α was inversely proportional to air permeability, with correlation coefficient 0.95. It was concluded that a higher thermal resistance and lower air permeability suggested a better sound absorption performance for a perpendicular-laid nonwoven fabric.

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New Method and Equipment for Measuring Thermal Properties of Textiles

Abstract: A theoretical discussion of a new method of measuring thermal properties, particularly the thermal handle of textilees, is followed by the description of a new Alambeta device and sensor developed for the purpose.

Cited by 87 publications

References 1 publication

Role of filament cross-section in properties of PET multifilament yarn and fabric. Part I: Effect of fibre cross-sectional shape on transmission behaviour of fabrics

Role of filament cross-section in properties of PET multifilament yarn and fabric. Part I: Effect of fibre cross-sectional shape on transmission behaviour of fabrics

Thermal Comfort of Bedsheets Under Real Conditions of Use

Study on Sound Absorption Performance and Transmission Behavior of Perpendicular-laid Nonwovens

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