Indian Silk

Post Cocoon

Silk Testing

Tensile Strength Testing of Silk Yarns and Fabrics

This folder provides information about the silkworm seed sector, covering seed production, multiplication, distribution, and quality assurance for mulberry, vanya, eri, tasar, and muga silkworms.

/indian-silk/host-plant-cultivation-maintenance-breeding

This folder provides information on cultivation, maintenance, and breeding of host plants used for silkworm rearing, including mulberry, vanya, eri, tasar, and muga host plants.

This topic provides information about Muga Silk Dress Material.

/indian-silk/silk-mark-organisation-of-india-smoi-

This folder provides information about the Silk Mark Organisation of India, the apex body that certifies authenticity of pure silk products, including certification processes and consumer protection measures.

Provides list of awards in the Silk sector

This folder offers information related to India's silk exports and imports, including trade statistics, export destinations, import sources, tariff structures, and regulatory framework governing silk trade.

This folder provides information on publicity, media campaigns, advertisements, press releases, and awareness initiatives undertaken to promote the Indian silk industry.

/indian-silk/post-cocoon/weaving-and-fabric

This folder provides information on silk weaving and fabric production, covering handloom and powerloom technologies, traditional weaving techniques, design development, dyeing and printing, finishing processes, and production of diverse silk fabrics. It showcases India's rich weaving heritage along with modern innovations that support the handloom sector and commercial silk fabric manufacturing.

/indian-silk/post-cocoon/silk-testing/twist-and-twist-testing-in-silk-yarns-and-fabrics-principles-methods-and-influence-on-fabric-properties

Twist is the helical insertion of turns into a yarn around its longitudinal axis and is an important parameter controlling yarn strength, cohesion, flexibility, surface characteristics and fabric performance. 

/indian-silk/post-cocoon/silk-testing/air-permeability-and-water-vapour-permeability-of-textile-materials-with-reference-to-silk-fabrics

Air permeability and water vapour permeability are important comfort-related properties of textile materials that determine how effectively air and moisture vapour can pass through a fabric. In silk fabrics, these properties contribute significantly to breathability, moisture management, thermal comfort and wearing comfort. 

/indian-silk/post-cocoon/silk-testing/drapability-stiffness-and-crease-recovery-of-textile-materials-with-special-reference-to-silk-fabrics

Drapability, stiffness and crease recovery are important fabric performance characteristics that strongly influence the appearance, handle, comfort and practical usability of textile materials. In silk fabrics, these properties are particularly important because they determine the characteristic fluid fall, softness, elegance and wrinkle behaviour of the fabric. 

/indian-silk/post-cocoon/silk-testing/dimensional-stability-of-textiles-testing-of-shrinkage-and-expansion-with-special-reference-to-silk

Dimensional stability is the ability of a textile material to maintain its original dimensions during use, washing, wet processing, drying, ironing and exposure to moisture or heat. 

/indian-silk/post-cocoon/silk-testing/guide-to-testing-sorting-and-quality-control-of-mulberry-cocoons

This guide outlines the essential procedures for identifying, sorting, and calculating the defect percentage of mulberry cocoons to ensure high-quality raw silk production. 

/indian-silk/post-cocoon/silk-testing/gc-ms-and-hplc-for-detection-of-banned-azo-dyes-and-arylamines-in-textiles

GC-MS and HPLC are powerful analytical techniques used to detect and identify hazardous dyes and substances in textiles. 

/indian-silk/post-cocoon/silk-testing/colour-fastness-of-textiles-principles-types-importance-and-testing

Colour fastness refers to the ability of a dyed, printed or coloured textile material to retain its original colour when exposed to various external influences such as washing, rubbing, perspiration, light, water and heat. 

/indian-silk/post-cocoon/silk-testing/understanding-abrasion-and-pilling-resistance-in-silk-fabrics-silk-testing-2

This comprehensive guide explores how abrasion and pilling resistance determine the durability, smoothness, and luxurious appearance of silk fabrics.

/indian-silk/post-cocoon/silk-testing/ftir-spectroscopy-for-identification-and-characterisation-of-textile-materials

Fourier Transform Infrared (FTIR) spectroscopy is a rapid and non-destructive or minimally destructive analytical technique used for identifying and characterising textile fibres, polymers, finishes, coatings and other chemical constituents present in textile materials.

/indian-silk/post-cocoon/silk-testing/standard-for-raw-silk-grading-and-methods-of-tests

This Indian Standard (Parts 1 to 11) was adopted by the Bureau of Indian Standards towards grading and methods of test for raw silk.

/indian-silk/post-cocoon/silk-testing/understanding-raw-silk-grading-importance,-methods,-and-global-standards

Raw silk grading standardizes the quality of silk through rigorous physical and mechanical testing, ensuring fair pricing, processing efficiency, and reliable international trade. This comprehensive guide explores key testing methods and compares major global grading systems, including the Chinese, Japanese, and Indian standards.

/indian-silk/post-cocoon/silk-testing/tensile-strength-testing-of-silk-yarns-and-fabrics

Tensile strength is the maximum force a textile material can withstand when subjected to a gradually increasing tensile load before rupture. It is an important indicator of the strength, durability and service performance of silk yarns and fabrics. 

This folder provides information on silk testing, quality evaluation, and certification of silk yarn and fabric. It covers physical, chemical, and mechanical testing parameters, grading systems, standards and specifications, testing laboratories, and quality control measures that ensure authenticity and performance of Indian silk products in domestic and international markets.

/indian-silk/post-cocoon/reeling-mulberry

This folder provides information on reeling of mulberry silk, the process of extracting continuous silk filaments from cocoons. It covers traditional and improved reeling technologies including charkha, cottage basin, multi-end, and automatic reeling machines, along with re-reeling, yarn quality parameters, and best practices for producing high-grade mulberry raw silk.

This folder contains information on reeling of vanya (non-mulberry) silks including tasar, eri, and muga. It covers specialised reeling and spinning techniques suited to the unique cocoon characteristics of each vanya variety, along with improved machinery, yarn production processes, and quality standards for tasar, eri, and muga silk yarn.

This folder provides information on post-cocoon activities in the silk value chain, including reeling of mulberry and vanya silk, weaving, fabric production, and silk testing.

/indian-silk/international-and-foreign-affair

This folder provides information about International and Foreign affair

/indian-silk/by-products-and-value-addition

This folder provides information about by-products of sericulture and opportunities for value addition, covering utilisation of sericin, silkworm pupae, waste silk, and mulberry fruits and leaves.

Information about the Indian silk is provided

/indian-silk/capacity-building-and-training-cbt-

This folder contains information on capacity building and training initiatives for stakeholders in the Indian silk sector, including skill development programs, workshops, and training modules.

This topic provides information about Kancheepuram Silk Sarees

/indian-silk/banaras-cutwork-fabric-and-silk-saree

This topic provides information about Banaras Cutwork Fabric and Silk Saree.

/indian-silk/schemes-and-other-technical-information

This folder contains information about central and state government schemes, subsidies, and financial assistance programs for sericulture stakeholders, along with technical guidelines and advisories.

/indian-silk/silkworm-rearing-and-breeding

This folder provides information on rearing and breeding practices for different silkworm varieties, including mulberry, vanya, eri, tasar (oak), and muga silkworms, along with silkworm biotechnology.

This topic provides information about Arni Silk Saree

Oak Tasar Sericulture is a type of wild or forest based sericulture focused on producing a finer variety of Tasar silk using the temperate oak-feeding silkworm, called Antheraea proylei. The silkworm feed on leaves of various oak species (Quercus spp.), such as Q. serrata, Q. incana, etc. These are abundant in temperate/sub-Himalayan regions. Oak tasar culture is mainly practiced inNE & NW states of India. It provides livelihood opportunities, especially for tribal and rural for tribal and rural communities in hilly/forested areas, contributing to sustainable forest-based income generation.

<h3>Introduction and Importance of Tensile Strength</h3>
<p>Tensile strength is the ability of a textile material to withstand an applied tensile force before it breaks. During manufacturing and use, textile materials are subjected to various tensile stresses, including pulling, stretching, handling, sewing, weaving and body movement. Tensile testing provides quantitative information about how a textile responds to these forces. For silk, tensile strength is an important quality parameter because silk is used in high-value apparel, sarees, dress materials, scarves, furnishing fabrics and technical applications. The strength of the silk yarn directly influences weaving performance, while the strength of the finished fabric reflects the combined contribution of yarn properties, fabric construction and processing.</p>
<p>Tensile testing generally provides information such as:</p>
<ul>
<li><strong>Breaking force: </strong>Maximum force required to break the specimen.</li>
<li><strong>Breaking strength:</strong> Breaking force expressed in a standardized form, where applicable.</li>
<li><strong>Elongation at break:</strong> Extension of the specimen at the point of rupture, usually expressed as a percentage.</li>
<li><strong>Tenacity:</strong> Breaking force relative to the linear density of the yarn, commonly expressed as cN/tex or a similar unit.</li>
</ul>
<p>A basic expression for elongation is:</p>
<p><strong>Elongation (%) = [(Length at break &minus; Original length) / Original length] &times; 100</strong></p>
<h3>Tensile Testing of Silk Yarn</h3>
<p>Silk yarn is the basic structural element used in the production of silk fabrics. Its tensile properties determine whether it can withstand the mechanical stresses encountered during winding, warping, sizing, weaving and subsequent processing. Silk yarn may be in the form of filament yarn, spun silk yarn or doubled/plied yarn, and the appropriate test procedure depends on the yarn construction. Tensile testing of silk yarn is important for:</p>
<ul>
<li>Assessing yarn strength and uniformity.</li>
<li>Evaluating weaving performance.</li>
<li>Determining the suitability of yarn for warp and weft applications.</li>
<li>Identifying weak yarn lots.</li>
<li>Comparing different silk yarn qualities.</li>
<li>Monitoring the effect of processing such as degumming, dyeing and finishing.</li>
<li>Supporting yarn quality control and procurement specifications.</li>
</ul>
<p>Warp yarns generally require adequate strength and abrasion resistance because they experience repeated mechanical stresses during weaving. Weft yarns may have different strength requirements depending on the fabric construction and weaving conditions.</p>
<h3>UTM Testing of Silk Yarn</h3>
<p>A Universal Testing Machine (UTM) equipped with suitable yarn grips and a load cell is used to apply a controlled tensile force to the yarn specimen.&nbsp;</p>
<p>Testing method: A conditioned yarn specimen of specified gauge length is clamped between the UTM jaws and subjected to a constant rate of extension until rupture; the machine records the breaking force and elongation at break. The resulting force&ndash;extension curve can provide additional information about the behaviour of the yarn during loading.</p>
<p>Important test parameters include:</p>
<ul>
<li>Gauge length.</li>
<li>Rate of extension.</li>
<li>Pre-tension.</li>
<li>Load-cell capacity.</li>
<li>Specimen conditioning.</li>
<li>Jaw type and clamping arrangement.</li>
<li>Number of specimens tested.</li>
</ul>
<p>Proper clamping is particularly important for silk because smooth filament yarns may slip from the grips or suffer localized damage if unsuitable grips are used.</p>
<h3>Tensile Testing of Silk Fabric</h3>
<p>Fabric tensile strength represents the ability of a textile fabric to withstand tensile loading in a particular direction before rupture. Unlike yarn tensile strength, fabric tensile strength is influenced by the interaction of many structural parameters. These include:</p>
<ul>
<li>Yarn strength.</li>
<li>Warp and weft density.</li>
<li>Yarn count.</li>
<li>Yarn twist.</li>
<li>Weave structure.</li>
<li>Fabric thickness.</li>
<li>Fabric mass.</li>
<li>Crimp.</li>
<li>Finishing treatments.</li>
<li>Dyeing and processing history.</li>
</ul>
<p>Fabric tensile strength is normally determined separately in the warp and weft directions, because the two directions may have substantially different properties.</p>
<p>Tensile testing of silk fabrics is important for:</p>
<ul>
<li>Assessing fabric durability.</li>
<li>Evaluating resistance to stretching and pulling.</li>
<li>Comparing warp and weft performance.</li>
<li>Assessing the effect of dyeing and finishing.</li>
<li>Determining suitability for garment manufacturing.</li>
<li>Monitoring production quality.</li>
<li>Investigating fabric damage or deterioration.</li>
<li>Establishing compliance with customer or product specifications.</li>
</ul>
<p>For silk fabrics, tensile strength is particularly important because excessive processing or chemical treatment may weaken the fibres and consequently reduce the strength of the finished fabric.</p>
<h3>UTM Testing of Silk Fabric</h3>
<p>A UTM fitted with appropriate fabric grips is used to apply tensile force to a fabric strip until it breaks. The machine records the maximum force and extension of the specimen.</p>
<p>Testing method: Fabric specimens are cut in the required warp and weft directions, conditioned and clamped in the UTM; each specimen is extended at a specified rate until rupture, and the maximum breaking force and elongation are recorded. Depending on the applicable standard, fabric tensile testing may use methods such as strip, grab or other specified specimen configurations.</p>
<h3>Factors Affecting Tensile Strength of Silk Yarns and Fabrics</h3>
<p>The tensile performance of silk is influenced by both intrinsic fibre properties and textile processing.</p>
<ul>
<li>Silk Fibre: Silk fibroin possesses good tensile properties, but the strength can be influenced by fibre quality, filament fineness, defects and processing history.</li>
<li>Degumming: Removal of sericin during degumming can alter the mass, surface characteristics and mechanical behaviour of silk. Excessive or poorly controlled processing may adversely affect fibre strength.</li>
<li>Dyeing and Chemical Processing: Dyeing conditions, pH, temperature, chemicals and processing time can influence the mechanical properties of silk. Severe processing may cause degradation of the fibre and reduction in tensile strength.</li>
<li>Yarn Construction: Yarn count, twist, filament arrangement and ply influence yarn tensile performance. Excessive twist can alter the balance between yarn cohesion and axial strength.</li>
<li>Fabric Construction: In fabric, the number of ends and picks, weave type, yarn crimp and fabric density influence tensile strength. A fabric's strength cannot therefore be predicted from yarn strength alone.</li>
<li>Moisture and Conditioning: Silk is hygroscopic, and its mechanical behaviour can vary with moisture content. Standardized conditioning is therefore important for reproducible tensile measurements.</li>
</ul>
<h3>Interpretation and Significance of Results</h3>
<p>Tensile test results should be interpreted according to the type of textile, direction of testing, applicable standard and intended end use. A higher breaking force does not necessarily indicate a better fabric in every application because elongation, fabric construction, handle and other performance characteristics must also be considered. For silk yarn, the combination of breaking force and elongation provides information about how the yarn will behave during processing and use. For silk fabric, testing in both warp and weft directions provides information about directional strength and fabric uniformity. The force&ndash;extension curve obtained from a UTM can also provide useful information about the deformation behaviour of the material before failure. Significant differences between specimens may indicate variation in yarn quality, fabric construction or processing.</p>
<p>Tensile testing should be performed under controlled conditions following the applicable BIS, ISO, ASTM or other specified test method, with appropriate specimen conditioning, gauge length, testing speed, grips and number of specimens.</p>
<h3>Conclusion</h3>
<p>Tensile strength testing is an essential component of textile quality evaluation. In silk, yarn tensile testing assesses the ability of yarn to withstand stresses during winding, warping, weaving and handling, whereas fabric tensile testing evaluates the strength of the finished textile in its warp and weft directions. A Universal Testing Machine provides a controlled and reproducible means of determining breaking force and elongation at break, making it valuable for research, quality control, process optimization and product evaluation. For silk textiles, tensile results should be considered together with yarn construction, fabric structure, processing history and other performance properties to obtain a complete assessment of material quality and end-use suitability.</p>