ASTM D737 PDF DOWNLOAD

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This standard is issued under the fixed designation D ; the number 1 This test method is under the jurisdiction of ASTM Committee D13 on Textiles. ASTM D Standard Test Method for Air Permeability of Textile Fabrics. What This Test is Used For: This test method covers the measurement of the air. Home; ASTM D standard by ASTM International, 01/01/ View all Printed Edition + PDF;; Immediate download; $; Add to Cart.


Astm D737 Pdf Download

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Save this Book to Read air permeability astm d 96 standard test method for PDF eBook at our Online Library. Get air permeability astm. ISO - Download as Word Doc .doc /.docx), PDF File .pdf), Text File .txt) or written specifically based upon the Frazier Tester: ASTM D, ASTM F Download and print out the webinar slides . Wind Resistant. ASTM D Air Permeability ASTM F Temperature Ratings on Cold Weather. Protective.

The increase in air permeability with fibre linear density can be attributed to increasing yarn diameter with increase in fibre linear density. This in turn results in reduced specific surface area. Lower the specific surface area, lesser the drag resistance to passage of air through fabric and hence the observed increase in air permeability with the increase in fibre linear density.

High porosity of plated fabrics knitted with fibres of higher linear density may also account for the increased air permeability. Other researchers Raj and Sreenivasan ; Varshney et al. Moisture vapour transmission rate As per Fig.

Ozdil et al. Positive correlation was observed between fibre linear density and moisture vapour transmission rate as indicated by high values of coefficient of determination Fig. Higher specific surface area offers more resistance to transmission of moisture vapour and hence the observed decrease in moisture vapour transmission rate with increase in fibre fineness.

Combed yarn fabrics RM1. Continuous, less tortuous and small diameter capillaries are most effective in liquid transfer through capillary wicking Das et al. Low yarn diameter and in turn high packing coefficient of combed yarn compared to carded yarn promote the formation of capillaries of small diameter. Lower the capillary diameter, greater will be the pressure created inside the capillary providing means for liquid flow.

High trans planar wicking of combed yarn fabrics is a result of capillaries of smaller diameter. Open image in new window Fig. Moreover, hairy structure of carded yarn may disrupt the continuity of capillaries; combed yarn on the other hand seems to be forming more continuous capillaries owing to more uniform and less hairy structure. High trans planar wicking of combed yarn fabrics can therefore be explained well in the light of above arguments.

It was observed that trans planar wicking decreased with the decrease in polyester fibre linear density. Creation of smaller capillaries may create sufficient drag slowing the liquid movement Varshney et al.

Water absorbency Comparison of carded and combed yarn fabrics for water absorbency reveals that carded yarn fabrics RC1. High fabric thickness along with high fabric porosity, leads to increased air volume fraction resulting in more water entrapment by pores, and hence, high water absorbency of carded yarn fabrics. The effect of fibre linear density on water absorbency of test fabrics is presented in Fig.

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Water absorbency was observed to increase with the increase in polyester fibre linear density for both carded RC3. For the same yarn fineness, as the fibre fineness decreases, the number of fibres in yarn cross-section decreases, which may result in increased yarn bulkiness and availability of high pore volume in yarn structure.

Large pores or a high total pore volume assists in higher liquid volume retention, as suggested by Varshney et al. An increase in water absorbency of fabrics with increase in fibre linear density is therefore well justified in the light of above arguments.

Conclusions Plated knit structures are characterized by distinct yet integrated inner and outer layers. Selection of contrastingly different fibre and yarn components in distinct inner and outer layers is possible which ensure dry skin microclimate and maximum wearer comfort.

The present study was undertaken with an aim to explore suitable combination of fibre and yarn variables for engineering polyester—cotton plated fabrics with good thermo-physiological properties. Categorical variables i. Plated fabrics knitted with carded yarn and polyester fibre of high linear density showed higher thermal resistance and would feel warmer on initial skin contact owing to low thermal absorptivity.

However, the air permeability and moisture vapour transmission rate increased with combination of combed cotton yarn in the outer and coarse polyester fibre in the inner layer. Combed yarn fabrics were superior in trans planar wicking compared to carded yarn counterparts. Water absorbency of fabrics with carded cotton yarn and coarse polyester fibre yarn was higher due to increased fabric thickness and porosity.

It can therefore, be concluded that plated fabrics with combination of carded yarn in the outer layer and coarse polyester fibre in the inner layer may be suitable for cold and dry conditions owing to high thermal resistance, warm feel next to skin and high water absorbency.

Plated fabrics incorporating combed yarn and coarse polyester fibre seem suitable choice in warm and humid conditions based on their superior air permeability, better moisture vapour and liquid moisture transmission properties.

References Ansari, N.

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Journal of the Textile Institute, 91, — A comparative study of some comfort properties of different fibre types. Textile Research Journal, 80, — Moisture transmission through textiles. Part I: Processes involved in moisture transmission and the factors at play.

Autex Research Journal, 7, — Google Scholar Das, A. Studies on cotton acrylic bulked yarns and fabrics. Part-I: Yarn characteristics. Journal of the Textile Institute, 98, — Effect of fibre diameter and cross-sectional shape on moisture transmission through fabrics. Fibers and Polymers, 9, — An increase in water absorbency of fabrics with increase in fibre linear density is therefore well justified in the light of above arguments.

Conclusions Plated knit structures are characterized by distinct yet integrated inner and outer layers.

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Selection of contrastingly different fibre and yarn components in distinct inner and outer layers is possible which ensure dry skin microclimate and maximum wearer comfort. The present study was undertaken with an aim to explore suitable combination of fibre and yarn variables for engineering polyester—cotton plated fabrics with good thermo-physiological properties. Categorical variables i. Plated fabrics knitted with carded yarn and polyester fibre of high linear density showed higher thermal resistance and would feel warmer on initial skin contact owing to low thermal absorptivity.

However, the air permeability and moisture vapour transmission rate increased with combination of combed cotton yarn in the outer and coarse polyester fibre in the inner layer. Combed yarn fabrics were superior in trans planar wicking compared to carded yarn counterparts. Water absorbency of fabrics with carded cotton yarn and coarse polyester fibre yarn was higher due to increased fabric thickness and porosity.

It can therefore, be concluded that plated fabrics with combination of carded yarn in the outer layer and coarse polyester fibre in the inner layer may be suitable for cold and dry conditions owing to high thermal resistance, warm feel next to skin and high water absorbency. Plated fabrics incorporating combed yarn and coarse polyester fibre seem suitable choice in warm and humid conditions based on their superior air permeability, better moisture vapour and liquid moisture transmission properties.

References Ansari, N. Journal of the Textile Institute, 91, — A comparative study of some comfort properties of different fibre types.

Textile Research Journal, 80, — Moisture transmission through textiles. Part I: Processes involved in moisture transmission and the factors at play.

Autex Research Journal, 7, — Google Scholar Das, A. Studies on cotton acrylic bulked yarns and fabrics. Part-I: Yarn characteristics. Journal of the Textile Institute, 98, — Effect of fibre diameter and cross-sectional shape on moisture transmission through fabrics. Fibers and Polymers, 9, — Studies of moisture vapour transmission through PV blended fabrics. Journal of the Textile Institute, 7, — Wicking and drying properties of conventional ring and vortex spun cotton yarns and fabrics.

Journal of the Textile Institute, , — Dry heat transfer characteristics of underwear fabrics.

Textile Research Journal, 53, — Wetting and wicking. Textile Research Journal, 66, — Effect of combed and carded yarn on weft knitted finished fabric quality. Google Scholar Nyoni, A. Wicking mechanisms in yarns-the key to fabric wicking performance.

Journal of the Textile Institute, 97, — Thermal comfort properties of cotton knitted fabrics in dry and wet states.

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Tekstil Ve Konfeksiyon, 3, — Google Scholar Oner, E. Evaluation of moisture management properties on knitted fabrics. Effect of yarn properties on thermal comfort of knitted fabrics. International Journal of Thermal Sciences, 46, — Warm-cool feeling relative to tribological properties of fabrics.

Textile Research Journal, 71, — Wickability behavior of single knit structures. Total wear comfort index as an objective parameter for characterization of overall wear ability of cotton fabrics.

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Journal of Engineered Fibers and Fabrics, 4, 29— Google Scholar Ramakrishnan, G. An investigation into the properties of knitted fabrics made from viscose microfibers.Google Scholar Nyoni, A.

Google Scholar Das, A. Textile Research Journal, 71, — Fabrics will have desirable aesthetic qualities if they can suppress odour-causing bacteria and other types of odour-causing microorganisms. Authors and Affiliations.

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