Influence of Punch Density and Fiber Blends on Thermal Conductivity on Nonwoven

Varkiyani, S. Mohammad Hosseini

doi:10.2174/1876520301104010001

Cited by 16 publications

(3 citation statements)

References 8 publications

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“…Experimental arrangement of the PIV measurement technique consists of (1) HiSence 12 bit digital camera, (2) light source -New-Wave Gemini pulsed laser with cylindrical optics expansion of the beam across the board cut, (3) laser beam illuminating the field of observation, (4) testing chamber, (5) textile sample, (6) heating plate, (7) thermocouples, and (8) the PC. The standard test method ASTM D7140M-13 was used.…”

Section: Fabric Densitymentioning

confidence: 99%

“…These types of textiles were made directly from individualized fibres. Nonwoven fabrics are important components for good thermal insulation of the body from the surroundings and have both space and weight savings [6]. The important constructional parameters are (1) thickness, (2) weight per unit area, and (3) packing fraction, which is the ratio between the bulk density of nonwoven fabric samples and of the same sample if it was made up wholly from fibres [7].…”

Section: Introductionmentioning

confidence: 99%

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Thermodynamics of aerogel-treated nonwoven fabrics at subzero temperatures

Venkataraman

Mishra

Jašíková

et al. 2014

Journal of Industrial Textiles

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Nonwoven fabrics and aerogel have complementary properties required for good thermal insulation. In this work, the polyester/polyethylene nonwoven thermal wraps treated with amorphous silica aerogel are studied and characterized with regard to thermodynamical properties at subzero temperatures. The characterization of physical structure was done by scanning electron microscope. C-Therm TCi thermal conductivity analyzer was used to measure thermal properties like conductivity, resistance, and effusivity at subzero temperatures. Heat transfer caused by convection through the thermal wraps was measured by particle image velocimetry technique, which allows obtaining information about the current distribution of velocities in two-dimensional array in a flowing fluid. Vector and scalar maps of the fluid flow were caused by thermal convection. The samples were studied for different temperature gradients. On scientific evaluation of results, thermal conductivity and thermal effusivity were found to be differing with respect to different temperatures and fabric density. Thermal resistance showed an increase as the fabric thickness increases. It was observed that fabric density and the aerogel present in the structures have a significant effect on thermal properties of aerogel-treated nonwoven fabrics. The findings in this study are significant and can be used for further research in aerogel-treated nonwoven fabrics.

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Section: Fabric Densitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermodynamics of aerogel-treated nonwoven fabrics at subzero temperatures

Venkataraman

Mishra

Jašíková

et al. 2014

Journal of Industrial Textiles

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“…Low price, low weight, easy production processes and diversity of structural porous properties caused nonwoven materials to be one of the most important products used for heat insulation as well. Previous studies [26,30,31,43,44,[84][85][86][87][88][89][90][91][92][93][94][95][96] evaluating nonwovens produced many different techniques indicated that fiber type, thickness, bulk density, porosity and any factors influencing these structural parameters alters the thermal insulation properties such as thermal resistance or thermal conductivity.…”

Section: Introductionmentioning

confidence: 99%

Assessing the Sound and Heat Insulation Characteristics of Nonwoven Composite Structures: Evaluation of Polypropylene (PP)/Polybutylene Terephthalate (PBT) Meltblown, Polyamide Nanofiber Inner Layers and Recycled Polyester (r-PET) Thermo Bonded Outer

ÇİNÇİK,

ASLAN

2024

Preprint

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The sound and heat insulation are among the most important concerns in modern life and nonwoven composite structures are highly effective in noise reduction and heat insulation. In this study, three layered nonwoven composite structures composed of recycled polyester (r-Pet) based thermo bonded nonwoven outer layer and meltblown nonwovens from PP and PBT as inner layers were formed to provide heat and sound insulation. Fiber fineness and cross section of thermo bonded outer layer, fiber type (PP/PBT), areal weight (100/200g/m2) and process conditions (calendared/non-calendared) of meltblown inner layer have changed systematically and the influence of these parameters on thickness, bulk density, air permeability, sound absorption coefficient and thermal resistance of composite structures were analyzed statistically. Also; the results were compared with composite structures including electrospun nano fiber web inner layer and with structures without inner layer. It was determined that sound absorption coefficients ranging between 0.77-0.98 for moderate sound frequencies and 0.99-1 for higher sound frequencies were acquired with developed nonwoven composite structures. Besides, higher sound absorption coefficients were obtained as 0.71 and 0.74 for low sound frequencies such as 800 and 1000Hz, respectively. As a result of this study it can be concluded that developed nonwoven composite structures that provides better sound absorption coefficients and similar thermal conductivity values compared to previous studies and materials in the market can be used as insulation material in required areas.

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Dynamic heat flux measurement for advanced insulation materials

Venkataraman

Mishra

Subramaniam³

et al. 2016

Fibers Polym

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This research elaborates determination of thermal characteristics e.g. thermal conductivity, resistance, convection and clo value of advanced thermal insulation materials using standing thermal manikin and a newly designed instrument in a controlled climatic chamber. A multi-segment thermal manikin with the thermal comfort regulation mode and a newly devised instrument was used to measure the forced convection through aerogel treated nonwoven fabrics and needle punched struto nonwoven fabric samples. With the newly designed instrument, the temperatures between the hotplate & fabric and on the surface of the fabric was measured keeping the temperature of climatic chamber constant. The convective heat transfer coefficient, conductivity and resistance was calculated accordingly and compared among the samples. In experiments with the thermal manikin, the temperatures and heat flux were measured for further calculation of resistance and clo values. The aerogel treated nonwoven fabrics showed higher resistance as compared to needle punched struto nonwoven fabrics. The results were analyzed and were statistically compared.

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Influence of Punch Density and Fiber Blends on Thermal Conductivity on Nonwoven

Cited by 16 publications

References 8 publications

Thermodynamics of aerogel-treated nonwoven fabrics at subzero temperatures

Thermodynamics of aerogel-treated nonwoven fabrics at subzero temperatures

Assessing the Sound and Heat Insulation Characteristics of Nonwoven Composite Structures: Evaluation of Polypropylene (PP)/Polybutylene Terephthalate (PBT) Meltblown, Polyamide Nanofiber Inner Layers and Recycled Polyester (r-PET) Thermo Bonded Outer

Dynamic heat flux measurement for advanced insulation materials

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