Showing posts with label Textile Processing. Show all posts
Showing posts with label Textile Processing. Show all posts

Friday, 22 May 2026

Bombay Cotton Sarees and Jetpur Printing



Bombay Cotton Sarees and Jetpur Printing: Understanding a Market Saree from the Inside

In Indian textile markets, many saree names are not formal textile categories. They are market names. They emerge from wholesale trade, buyer memory, supplier language, and customer familiarity. One such name is “Bombay Cotton” saree.

A buyer may hear this term in Kalbadevi Market in Mumbai, in a saree wholesale shop, or from a supplier who sources from Gujarat. The saree may be called Bombay Cotton, fancy cotton, malai cotton, printed cotton, or summer cotton. But technically, what exactly is it? Is it woven in Bombay? Is it pure cotton? Is it a traditional regional saree? Or is it a trade category used for a certain type of printed cotton saree?

The answer is that Bombay Cotton is best understood as a market name for value-segment printed cotton or cotton-blend sarees sold through Mumbai wholesale channels, especially markets such as Kalbadevi, Mangaldas Market, Bhuleshwar, and nearby textile trading areas.

These sarees are often manufactured or processed in textile clusters such as Jetpur and Ahmedabad, and then supplied to traders and wholesalers in Mumbai and other parts of India.

What Is a Bombay Cotton Saree?

A Bombay Cotton saree is not a protected craft name like Banarasi, Kanchipuram, Chanderi, Kota Doria, or Maheshwari. It is not a GI-tagged category. It is also not a strict technical fabric specification.

It is more accurately a commercial saree category. In the market, Bombay Cotton sarees are usually positioned as light cotton sarees, printed daily-wear sarees, summer sarees, budget sarees, wholesale sarees, soft cotton sarees, malai cotton sarees, or fancy cotton sarees with printed body and border.

The term “Bombay” in Bombay Cotton does not necessarily mean that the saree is woven or processed in Bombay. It usually indicates that the saree is part of the Mumbai wholesale distribution system. A saree may be printed in Jetpur, finished in Gujarat, traded in Mumbai, and then sold in retail markets across India under the name Bombay Cotton.

This is common in textile trade. Market names often describe the selling route, look, feel, price point, or customer perception, not the exact production origin.



Bombay Cotton saree market identity map

Visual 1: Bombay Cotton as a market name connecting Jetpur processing, Ahmedabad/Gujarat sourcing, Mumbai wholesale trade, and retail selling.

Why Kalbadevi Market Matters

Kalbadevi is one of Mumbai’s important textile trading areas. Along with Mangaldas Market, Bhuleshwar, Swadeshi Market, and nearby wholesale lanes, it forms a dense textile-commercial ecosystem.

Many sarees sold in such markets are not manufactured in Mumbai itself. Mumbai acts as a trading, aggregation, distribution, and branding point. A trader in Kalbadevi may buy printed sarees from Jetpur, Ahmedabad, Surat, or other textile centres. These sarees are then packed, labelled, bundled, and sold to retailers or smaller wholesalers.

The final buyer may know them as Bombay Cotton because that is the name used in the market. So, Bombay Cotton is less about a single manufacturing location and more about a market identity.

Jetpur’s Role in Printed Cotton Sarees

Jetpur, located in Gujarat, is known as an important textile printing and processing cluster. It has long been associated with dyed and printed fabrics, sarees, dress materials, and other value textile products.

For Bombay Cotton-type sarees, Jetpur’s role is especially important because it is a processing cluster. This means that the grey fabric may not always be woven in Jetpur. Fabric may be sourced from weaving centres, brought to Jetpur, and then processed there.

The work done in Jetpur may include scouring, bleaching, printing, dye fixation, washing, drying, starching, softening, stentering, ironing, folding, and packing. Therefore, it is more accurate to call many of these products Jetpur-processed printed cotton sarees rather than Jetpur-woven sarees, unless the supplier specifically confirms that the fabric is woven there.

Technical note: In textile merchandising, it is important to separate the weaving origin, processing origin, trading origin, and market name. Bombay Cotton is usually a market name. Jetpur is often the processing location. Mumbai/Kalbadevi may be the trading location.

Typical Fabric Used

The base fabric of these sarees is usually sold as cotton, but the actual fibre content must be verified. In the market, terms like “pure cotton,” “malai cotton,” “Bombay cotton,” and “soft cotton” are frequently used. However, these words do not always guarantee 100% cotton.

Market Term Technical Possibility
Pure cotton May be 100% cotton woven fabric, but should still be verified.
Malai cotton May refer to soft-finished cotton or cotton-blend fabric.
Bombay cotton Usually a trade name; may be cotton or a cotton-like blend.
Fancy cotton May include cotton, poly-cotton, viscose-cotton, or other blended fabrics.
Printed cotton May be cotton base or cotton-like cellulosic fabric.

A buyer should therefore not rely only on the market name. The fibre composition should be checked through supplier declaration, burn test, lab test, or invoice description.

Common Design Types

Jetpur-processed cotton sarees are popular because they can imitate many traditional design effects through printing. These sarees may not be traditional handcrafted versions of those techniques, but printed interpretations for mass-market use.

Common design styles include Bandhani print, Leheriya print, Ajrakh-look print, Patola-look print, floral print, butta print, geometric print, traditional border and pallu print, ethnic motif print, and temple border or zari-look border print.

This is one reason these sarees sell well in wholesale markets. They give the customer a familiar ethnic look at an affordable price.

A printed Bandhani saree, for example, may visually remind the customer of tie-dye Bandhani, but technically it may be screen printed. Similarly, a Patola-look saree may carry motifs inspired by Patola, but it is not a double-ikat Patola. This distinction is important for textile education and honest selling.

The Manufacturing Process of Jetpur Printed Cotton Sarees

The process can be understood as a chain of textile preparation, printing, fixing, washing, finishing, and packing. In simplified form, the total process can be expressed as:

\[ \text{Printed Saree Quality} = \text{Fabric Quality} + \text{Preparation} + \text{Printing Accuracy} + \text{Fixation} + \text{Washing} + \text{Finishing} \]

1. Grey Fabric Procurement

The process starts with grey or prepared fabric. The fabric may come in rolls or in saree lengths. Grey fabric means unfinished woven fabric that has not yet been fully bleached, dyed, printed, or finished. It may contain natural impurities, sizing material, oils, dirt, and other residues from spinning and weaving.

Before printing, this fabric has to be prepared properly. If the fabric preparation is weak, no amount of attractive printing can fully compensate for the loss of absorbency, whiteness, print sharpness, or fastness.

2. Scouring

Scouring removes natural and added impurities from the fabric. Cotton fabric may contain waxes, pectins, oils, dirt, and sizing material. If these are not removed, the fabric will not absorb dye evenly. The print may become patchy, dull, or uneven.

Scouring improves the absorbency of cotton and makes the fabric suitable for dyeing or printing. A poorly scoured fabric may show uneven colour, poor print penetration, dull shade, patchy appearance, and poor washing performance.

3. Bleaching

After scouring, the fabric may be bleached to improve whiteness. Bleaching is especially important when bright prints are required. If the base fabric is not clean and white, the printed colours may look muddy.

For pastel shades and sharp motifs, a good white base is very useful. Bleaching prepares the fabric for printing by giving a cleaner background.

4. Drying Before Printing

After wet preparation, the fabric is dried. Drying must be controlled so that the fabric is ready for printing. If the fabric carries too much moisture, printing paste may spread. If the fabric is too unevenly dried, print quality may suffer.

For sarees, fabric may be printed in continuous length or cut into saree lengths depending on the production method.

5. Printing Paste Preparation

For cotton sarees, the printing paste generally contains dye, thickener, water, and other required chemicals. In many Jetpur cotton saree processes, reactive dyes are used. Reactive dyes are suitable for cotton because they can chemically bond with cellulose under alkaline conditions.

A basic printing paste may contain reactive dye, thickener such as guar gum, water, auxiliary chemicals, and an alkali or alkali-related fixation system depending on the process.

The thickener is important because it controls the flow of the dye paste. Without thickener, the dye would spread uncontrollably and the printed motif would lose sharpness.

6. Screen Printing or Flat-Bed Printing

The prepared fabric is printed using screen printing, flat-bed printing, or table printing methods. In table screen printing, the fabric is spread on a long table. Screens carrying the design are placed over the fabric, and printing paste is pushed through the screen openings. Each colour usually requires a separate screen.

In flat-bed printing, the process is more mechanized. Screens move systematically over the fabric, allowing faster and more uniform production.

For sarees, printing has to manage three important visual zones: the body, the border, and the pallu. The body may carry repeated motifs. The border may carry a continuous design. The pallu may have a heavier or more decorative layout. This is why saree printing is different from ordinary fabric printing. A saree is not just a printed length of cloth. It has a wearing logic and a display logic.

Jetpur printed cotton saree process flow
Visual 2: Process flow for Jetpur-processed cotton printed sarees from grey fabric to packed saree.

7. Drying After Printing

After printing, the fabric must be dried before fixation. If the printed fabric is handled too early, the design may smudge. If drying is uneven, colour migration can occur. If the printed paste remains wet for too long in uncontrolled conditions, the print may lose sharpness.

Drying may be done on printing tables, in open air, on hot tables, through drying chambers, or through machine systems. This stage affects the final clarity of the print.

8. Dye Fixation

Reactive dyes need fixation. Fixation is the stage in which dye molecules bond with cotton cellulose. In Jetpur-style processing, sodium silicate is commonly associated with the fixation process. Sodium silicate helps create the alkaline condition needed for reactive dye fixation.

The printed fabric may be padded with sodium silicate solution and then kept for several hours for fixation. This resting or batching time allows the dye to react with the fibre.

If fixation is poor, the saree may show colour bleeding, low washing fastness, shade loss, poor rubbing fastness, and dullness after the first wash. Fixation is therefore one of the most critical stages in the technical quality of these sarees.

9. Washing

After fixation, the fabric must be washed thoroughly. Washing removes unfixed dye, gum or thickener, sodium silicate residue, surface chemicals, loose colour, and processing impurities.

This stage has a direct impact on customer satisfaction. A saree that is not washed properly may bleed colour during home washing. It may also feel harsh or carry a chemical smell.

In value sarees, inadequate washing is a common risk. The saree may look attractive when new, but it may lose colour or stiffness after the first wash. Good washing improves colour fastness, handle, skin comfort, fabric cleanliness, and long-term appearance.

10. Drying After Washing

After washing, the saree must again be dried. Drying may be natural or machine-assisted. Proper drying helps prevent stains, water marks, uneven shade, and mildew smell.

At this stage, the fabric has already gone through several wet processes. Dimensional stability becomes important because cotton can shrink if not properly handled.

11. Finishing

Finishing gives the saree its final market feel. Many value cotton sarees are finished with starch, softener, wax-like finish, or other finishing agents. These finishes improve appearance and touch.

Finish Purpose
Starch finish Gives body, crispness, and a fuller shop-floor appearance.
Softener finish Gives a softer hand feel and better drape.
Wax-like finish Improves smoothness and surface feel.
Stentering Controls width and improves dimensional presentation.
Pressing Improves retail appearance.
Folding Gives saleable presentation for wholesale or retail packing.

Starch is especially important in low-to-mid priced cotton sarees because it gives body to the fabric. A thin fabric can look fuller and more attractive after starching. However, buyers must remember that the first wash may remove some starch. After washing, the saree may become softer, thinner, or less crisp than it looked in the shop.

12. Ironing, Folding and Packing

After finishing, the sarees are ironed, folded, labelled, and packed. Packing may be done as single saree packs, design-wise bundles, sets of six, sets of eight, catalogue sets, or bale packing for wholesale dispatch.

The sarees may then be supplied to Mumbai, Delhi, Kolkata, Hyderabad, Chennai, Bengaluru, and other markets. In Mumbai, they may reach wholesale markets such as Kalbadevi, from where they are redistributed to retailers.

Complete Process Flow

Grey or prepared cotton fabric
        ↓
Scouring
        ↓
Bleaching
        ↓
Drying
        ↓
Cutting or rolling
        ↓
Printing paste preparation
        ↓
Screen / flat-bed / table printing
        ↓
Drying
        ↓
Sodium silicate fixation
        ↓
Batching / resting
        ↓
Washing
        ↓
Drying
        ↓
Starching / softening / finishing
        ↓
Stentering or drying chamber
        ↓
Ironing
        ↓
Folding and labelling
        ↓
Packing
        ↓
Dispatch to wholesale markets

Why These Sarees Are Commercially Successful

Bombay Cotton and Jetpur-printed cotton sarees succeed because they meet a clear market need. They are affordable, colourful, lightweight, easy to produce in volume, suitable for summer and daily wear, capable of carrying many traditional-looking designs, easy to distribute through wholesale markets, and attractive to price-sensitive customers.

A customer may want the look of Bandhani, Ajrakh, Patola, floral cotton, or ethnic printed saree, but may not want to pay the price of the original craft version. Printed cotton sarees fill this gap.

They democratize design, even if they do not carry the same craft value as hand-produced textiles.

Technical Risks in These Sarees

From a buyer’s point of view, these sarees must be checked carefully. The attractive print and low price can sometimes hide quality issues.

Risk What It Means
Fibre misdescription The saree may be sold as cotton, but it may be a blend. This affects comfort, absorbency, drape, wash behaviour, and price justification.
Poor colour fastness If dye fixation or washing is inadequate, the saree may bleed colour.
Excessive starch A saree may feel crisp and full in the shop because of starch. After washing, it may lose body.
Shrinkage Cotton sarees may shrink after washing if not properly processed.
Harsh handle Improper washing or chemical residue may make the fabric harsh.
Print misalignment In low-cost printed sarees, border, pallu, and body alignment may not always be perfect.
Chemical smell Strong chemical smell may indicate inadequate washing or finishing.

Buyer’s Checklist

Before buying Bombay Cotton or Jetpur-printed cotton sarees in bulk, the following questions should be asked:

  1. Is the saree 100% cotton or a blend?
  2. What is the fabric count or approximate GSM?
  3. What is the saree weight?
  4. Is the print reactive, pigment, discharge, or another type?
  5. Is the design screen printed, flat-bed printed, or digitally printed?
  6. Is the Bandhani or Leheriya effect actual tie-dye or printed imitation?
  7. What is the colour fastness to washing?
  8. What is the colour fastness to rubbing?
  9. What is the expected shrinkage?
  10. Is the border woven, printed, attached, or zari-look?
  11. Is starch used in finishing?
  12. Will the hand feel change after washing?
  13. Is the saree sold with blouse piece?
  14. What is the saree length?
  15. Is the product packed as single pieces, sets, catalogues, or bales?

These questions help convert a vague market name into a technically understood product.

How to Explain These Sarees Honestly to Customers

A good retailer should not oversell these sarees as traditional handcrafted sarees if they are actually printed imitations. A fair description would be:

“This is a printed cotton saree, commonly sold as Bombay Cotton. It has a light, comfortable feel and printed traditional-style motifs. The saree is suitable for daily wear and summer use. The design gives the look of Bandhani, Ajrakh, Patola, or similar traditional patterns, but it is a printed version, not the original handcrafted technique.”

This kind of explanation builds trust. It also helps customers understand why the saree is affordable.

Bombay Cotton vs Traditional Craft Sarees

Feature Bombay Cotton / Jetpur Printed Cotton Traditional Craft Saree
Identity Market name Regional or craft identity
Production Mass printing Handloom, tie-dye, ikat, block print, or other craft process
Price Low to moderate Moderate to high
Design Printed imitation or commercial motif Technique-based design
Uniqueness Repeated designs Often more variation and craft character
Value Affordability and utility Craft, skill, heritage, authenticity
Buyer expectation Daily wear and value Occasion, tradition, artistry

Both have their place. The problem arises only when one is sold as the other.

A Better Technical Name

Instead of calling them only Bombay Cotton sarees, a more technically accurate name would be:

Jetpur-processed printed cotton sarees sold through Mumbai wholesale markets.

This phrase tells us three things. First, the saree is printed and processed. Second, Jetpur is part of the production or processing chain. Third, Mumbai or Kalbadevi is part of the trading and distribution chain.

This is more accurate than assuming that Bombay Cotton means a specific fabric or that the saree is manufactured in Bombay.

Sources

  1. Fibre2Fashion / Alchempro. “Decentralized Printing Cluster of Jetpur.”
  2. SAMEEEKSHA. “Cluster Profile Report: Jetpur Textiles, Gujarat.”
  3. Chokhavatia Associates. “Jetpur Dyeing & Printing Association: CETP, 30 MLD Flow.”
  4. Kumar et al. “Textile Industry Wastewaters From Jetpur, Gujarat, India...” Frontiers in Environmental Science, 2021.
  5. Fibre2Fashion. “Dyeing and Block-Printing Units Face a Grim Future.”

Conclusion

Bombay Cotton sarees are an interesting example of how Indian textile markets create names. The name does not describe a strict textile standard. It describes a commercial category shaped by wholesale trade, customer familiarity, price point, and product appearance.

These sarees are usually light, printed, affordable, and suitable for daily wear. Many of them are processed in Jetpur and supplied through Mumbai markets such as Kalbadevi. Their designs may imitate Bandhani, Leheriya, Ajrakh, Patola, floral, ethnic, or border-pallu styles through printing.

Technically, the key processes include fabric preparation, scouring, bleaching, screen or flat-bed printing, reactive dye fixation, sodium silicate treatment, washing, drying, starching or softening, ironing, folding, and packing.

For buyers and merchandisers, the main lesson is simple: do not depend only on the market name. Check the fibre, print method, finishing, colour fastness, shrinkage, and actual construction.

Bombay Cotton is a useful trade term, but technical understanding gives the buyer real control.

General Disclaimer

This article is intended for general textile education and merchandising understanding. Market terms such as Bombay Cotton, malai cotton, fancy cotton, Bandhani print, Patola print, and Ajrakh-look print may vary from supplier to supplier. Actual fibre composition, dye class, print method, finishing process, shrinkage, and colour fastness should be verified through supplier declaration, testing, purchase specification, or laboratory evaluation before commercial buying decisions are made.

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What is Glazed Cotton



Glazed Cotton in India: Fabric, Finish, or Trade Name?

In Indian fabric markets, some textile names are technically precise, while others are shaped by trade usage. Glazed cotton belongs to the second category. A buyer may hear this term in Ahmedabad, Surat, Delhi, Jaipur, or online fabric markets, but the fabric sold under this name may not always be the same.

Sometimes it is genuine cotton with a polished finish. Sometimes it is poly-cotton. Sometimes it may even be a cotton-look synthetic or viscose-blend fabric sold under a familiar market name. Therefore, glazed cotton needs to be understood carefully from both a technical and a sourcing point of view.

Table of Contents

What Is Glazed Cotton?

Technically, glazed cotton is a cotton fabric that has been given a smooth, shiny, polished surface. The word glazed describes the surface appearance and finish, while the word cotton should describe the fibre. This means that glazing is not a fibre category by itself.

Textile references describe glazing as a finish that adds lustre and smoothness to fabric. Many glazed fabrics are plain-woven cottons, and the shine may be produced by passing the fabric through a friction calender, where heated rollers polish the fabric surface.

In simple words, glazed cotton is not a new fibre. It is cotton, or sometimes cotton-like fabric, whose surface has been made smoother and shinier through finishing. This distinction is important for merchandisers because the name alone does not tell us the actual fibre composition, GSM, construction, wash durability, or end-use suitability.

Glazed Cotton Meaning Map

Visual 1: Glazed cotton meaning map — separating fibre, fabric construction, surface finish and market name.

Does Glazed Cotton Mean Viscose?

No, glazed cotton does not automatically mean viscose. Viscose is a regenerated cellulose fibre, while cotton is a natural cellulose fibre. Both may have good absorbency, both may burn with a paper-like smell, and both can be made into soft dress fabrics, but they are not the same fibre.

Glazed cotton should ideally mean cotton fabric with a glazed finish. However, Indian market practice often complicates this. A fabric sold as glaze cotton may sometimes be pure cotton, but it may also be cotton-polyester, polyester-viscose, viscose-cotton, or another cotton-look fabric.

This is why the safest sourcing question is not simply, “Is this glazed cotton?” The better question is: “Is this 100% cotton, cotton-polyester, viscose-cotton, polyester-viscose, or only cotton-look fabric?”

Why the Confusion Happens in Indian Markets

Indian fabric names are often based on appearance, touch, use and selling convenience. A fabric may be named according to its look, such as shiny, glazed, satin-look or silk-look. It may be named according to its feel, such as soft, crisp, flowy or buttery.

It may also be named according to its use, such as blouse fabric, kurti fabric, dress material or lining. In some cases, the name may refer to a historical or trade category rather than a strict fibre specification.

This is why “glazed cotton” should be treated as a trade description unless the supplier provides the actual composition and test details. The fabric name may describe the look, but the purchase specification must describe the fibre, weight, width, construction and performance.

How Glazed Cotton Is Made

The basic idea behind glazed cotton is simple: the fabric surface is made smoother, flatter and more reflective. This is done through preparation, chemical finishing, drying, stentering and calendaring. The finish may involve starch, wax, resin, softener or a combination of finishing agents.

A traditional temporary glaze may depend mainly on starch, wax and calendaring. A more durable glaze may use a resin-based finish, which can withstand washing better than ordinary starch or wax-based finishes. However, resin finishing may also affect softness, absorbency and comfort if not controlled properly.

The shine or glaze is therefore not created only by the yarn or weave. It is usually the combined result of yarn surface smoothness, fabric preparation, finishing chemicals and mechanical pressure.

Likely Process Sequence

A typical process sequence for glazed cotton may be understood as follows. The actual sequence may vary depending on the mill, fibre blend, fabric quality, cost level and end use.

Grey woven fabric
        ↓
Singeing
        ↓
Desizing
        ↓
Scouring
        ↓
Bleaching, if required
        ↓
Mercerisation, optional
        ↓
Dyeing or printing
        ↓
Padding with starch / wax / resin / softener finish
        ↓
Drying and stentering
        ↓
Hot calendaring or friction calendaring
        ↓
Curing, if resin finish is used
        ↓
Inspection, folding, packing
  

In textile processing language, the material-to-liquor relationship is often written as \( M:L \). For example, \( M:L = 1:20 \) means that one part fabric is treated with twenty parts processing liquor. Such ratios become important when finishing chemicals are padded or applied in controlled processing conditions.

Glazed Cotton Process Flow
Visual 2: Process sequence for glazed cotton — from grey fabric to calendared glazed finish.

Role of Calendaring

Calendaring is the heart of the glazing process. In calendaring, fabric passes between rollers under controlled pressure, heat and time. This changes the surface texture, handle and appearance of the cloth.

In friction calendaring, one roller may move faster than the other. This rubbing or polishing action increases lustre and gives a glossy surface. This is why glazed cotton often looks smoother and more polished than ordinary cotton.

In practical terms, the fabric is being compressed, flattened and polished. The tiny projecting fibres are pressed down, the yarn spaces become more closed, and the surface reflects more light. This gives the buyer the visual impression of a cleaner, richer and more valuable fabric.

Temporary vs Durable Glaze

Not all glazed finishes behave the same after washing. A temporary glaze may look very attractive when the fabric is bought, but it may lose shine after the first or second wash. This usually happens when the effect depends heavily on starch, wax or surface calendaring.

A more durable glaze may use resin or other finishing chemistry. This can improve wash resistance, but it may also make the fabric slightly stiffer or less absorbent if the recipe is not balanced. Therefore, the most important practical sourcing question is: “Will the glazed effect remain after three to five washes?”

This one question often reveals the quality level of the finish. If the supplier cannot answer clearly, the buyer should insist on a wash test before bulk purchase.

Relationship with Chintz

Glazed cotton is closely related to chintz. Traditionally, chintz refers to a cotton fabric with a glazed finish, often printed with floral or decorative designs. In many textile descriptions, chintz is associated with a glossy or polished surface produced through glazing or calendaring.

However, in Indian dress-material markets, similar names may be used loosely. A fabric called chintz or glaze cotton may not always be pure cotton. It may be a polyester-viscose or other blended fabric with a shiny finish. This is why the relationship between glazed cotton and chintz should be understood technically, but the market product should still be verified separately.

Where Is Glazed Cotton Made in India?

Two important centres come up repeatedly in the context of glazed cotton and similar fabrics: Ahmedabad and Surat. Both are relevant, but they are relevant in slightly different ways.

Ahmedabad

Ahmedabad is more strongly associated with cotton fabric, cotton fabric trading, dyeing, printing, processing and finishing. For a genuine cotton-based glazed fabric, Ahmedabad is a logical sourcing point because of its cotton textile ecosystem and processing infrastructure.

Areas such as Narol, Danilimda and nearby processing belts are important for dyeing, printing and finishing activity. If the requirement is true cotton base fabric with a controlled finish, Ahmedabad should be one of the first markets to investigate.

Surat

Surat is highly important for fashion fabrics, synthetic fabrics, printed fabrics, saree materials, dress materials and blended fabrics. It is especially relevant when the product is sold as printed glaze cotton, poly-cotton, viscose-blend, polyester-viscose, cotton-look fabric or kurti/dress-material fabric.

In practical sourcing, Surat may be more active for commercial fashion varieties, while Ahmedabad may be more relevant for cotton-based fabric and processing. The sourcing decision should therefore depend on the actual specification, not only on the trade name.

Requirement Better Starting Point
Genuine cotton base fabric with finishing Ahmedabad
Printed fashion fabric called glaze cotton Surat
Poly-cotton or synthetic cotton-look glazed fabric Surat
Cotton grey fabric and processing Ahmedabad
Dress material trade variety Surat
Ahmedabad and Surat Glazed Cotton Sourcing Map
Visual 3: Ahmedabad vs Surat sourcing map — cotton processing strength, fashion fabric trade and blended fabric possibilities.

How to Identify the Actual Fabric

A buyer should never rely only on the name glazed cotton. The name is useful as a market starting point, but it is not enough for technical buying, quality control or costing.

Check Why It Matters
Composition Confirms whether the fabric is cotton, viscose, polyester, poly-cotton or another blend.
GSM Helps judge weight, body, suitability and cost.
Width Important for consumption, cutting and costing.
Construction Shows whether the fabric is plain weave, satin, twill, dobby or another structure.
Finish type Distinguishes starch, wax, resin, softener and calendared effects.
Wash durability Shows whether the glaze is temporary, semi-durable or durable.
Shrinkage Critical for garment fit and customer satisfaction.
Fastness Important for washing, rubbing, perspiration and light exposure.

For a quick field-level assessment, the buyer may observe hand feel, drape, crease behaviour, surface shine and wash response. A very fluid drape may suggest viscose or rayon content. Low creasing may suggest polyester content. A shine that disappears after washing may suggest a temporary surface finish.

Burn testing can provide rough clues, but it should not be treated as final proof. Cotton and viscose are both cellulose-based and may show similar burning behaviour. For serious sourcing, fibre composition should be verified through a reliable laboratory test.

Suggested Buyer Specification

For a merchandiser, glazed cotton should be understood as a finish-led product, not just a fibre-led product. A purchase order written only as “glazed cotton” is too vague and may lead to confusion.

A better purchase specification would include the following:

  • Fabric name: Glazed cotton or glazed cotton blend.
  • Composition: 100% cotton, cotton-polyester, polyester-viscose or other confirmed blend.
  • GSM: Agreed measured GSM with tolerance.
  • Width: Finished usable width.
  • Construction: Plain weave, satin, dobby, twill or other specified weave.
  • Finish: Calendared glazed finish, resin glazed finish or semi-durable glazed finish.
  • Wash performance: Shine retention after defined number of washes.
  • Shrinkage: Maximum accepted shrinkage percentage.
  • Fastness: Washing, rubbing, perspiration and light fastness as required.
  • End use: Blouse, kurti, dress material, lining, bedsheet or furnishing.

This kind of specification protects the buyer from receiving a fabric that looks correct initially but fails in wash, hand feel, shrinkage, fibre content or customer performance.

Final Conclusion

Glazed cotton is best understood as a fabric with a glazed finish, not as a separate fibre category. It does not automatically mean viscose. It may be pure cotton, poly-cotton, viscose blend, polyester-viscose or another cotton-look fabric depending on the supplier and market.

The glazed effect is generally produced through surface finishing and calendaring, often with starch, wax, resin or similar finishing agents. The most important technical issue is whether the glaze is temporary or durable after washing.

In India, Ahmedabad is more relevant for cotton fabric, grey fabric, dyeing, processing, finishing and wholesale cotton trade. Surat is more relevant for fashion fabrics, printed fabrics, synthetic blends, poly-cotton, viscose-blend and market-sold glaze cotton dress materials.

The safest rule is simple: do not buy glazed cotton by name alone. Buy it by composition, GSM, width, construction, finish durability, shrinkage and fastness.

Sources

  1. “Glazing,” Encyclopedia.com. Available at: https://www.encyclopedia.com/fashion/encyclopedias-almanacs-transcripts-and-maps/glazing
  2. “Chintz,” Encyclopedia.com. Available at: https://www.encyclopedia.com/sports-and-everyday-life/fashion-and-clothing/textiles-and-weaving/chintz
  3. “Chintz,” CAMEO, Museum of Fine Arts Boston. Available at: https://cameo.mfa.org/wiki/Chintz
  4. “Calendering Finishing Process in Textile Industry,” Textile Learner. Available at: https://textilelearner.net/calendering-finishing-process-in-textile-industry/
  5. “Textile traders to set up New Cloth Market in Piplaj,” The Times of India. Available at: https://timesofindia.indiatimes.com/city/ahmedabad/textile-traders-to-set-up-new-cloth-market-in-piplaj/articleshow/126219038.cms

General Disclaimer

This article is intended for educational and general textile knowledge purposes only. Fabric names used in Indian markets may vary by region, supplier and trade practice. Before commercial buying, always confirm fibre composition, GSM, width, construction, finish durability, shrinkage and colour fastness through supplier documentation, sample testing and, where required, laboratory verification.

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Wednesday, 5 December 2012

Dyeing of Silk with Reactive Dyes



This is as per a brochure from CSTRI ( Central Silk Board Bangalore)

Receipe

M:L- 1:30
Dye: X% on the weight of material.
Glauber Salt- 20% of the weight of material ( 1st Stage)
Glauber Salt- 20% of the weight of material (2nd Stage)
Soda Ash- 5% of the weight of material ( 1st Stage)
Soda Ash- 5% on the weight of material (2nd Stage)
Temperature ( Cold Brand)- 50 deg C
Temperature ( Hot Brand) - 60 deg C
pH-9,  Time: 65-75 minutes

 Procedure

Preparation of dye solution:

Dissolve required dye powder in boiling water in a separate beaker/vessel.

Set the dye bath with required quantity of water.
Add dye solution and add 20% Glauber salt and 5% soda ash at 1st stage.
Enter the material and work for 10 minutes.
Add 20% glauber salt and 5% sold ash at 2nd stage and work for 20 minutes.
For Cold brand reactive dyes, work for 45 minutes at 50 deg.
For hot brand reactive dyes, work for 45 minutes at 60 deg.
Take out the material followed by cold wash.
Remove excess water by using hydro extractor.
Dry under shade.


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Tuesday, 4 December 2012

Chemicals used in Textile Processing-2



1. Bleaching Powder

It is hypochlorite of calcium and sodium. Bleaching powder on treatment with small quantities of dilute acid liberates hyopchlorous acid, whcih can easliy furnish nascent oxygen and thus acts as an oxidizing and bleaching agent. It is used for the following purposes:

1. As an oxidising agent in garment processing
2. For bleaching cotton, linen and wool.
3. In rendering wool unshrinkable.

2. Hydrogen Peroxide, H2O2

Hydrogen peroxide is a colorless, odorless, syrupy liquid in the anhydrous state. It is a powerful oxidizing agent. It destroys the color of some organic compounds and is used in garment and textile industry for bleaching delicate fabrics like wool, straw and silk.

3. Potassium Chlorate KClO3

Potassium chlorate is a white crystalline solid, which is soluble in water. On heating it decomposes to give oxygen. The ease with which it can lose oxygen, it acts as a strong oxidizing agent. It is used for garment printing.

4. Potassium Chromate

Potassium chromate is available in the form of lemon yellow crystals with no water of crystallization. In garment industry it is used as a mordant.

5. Potassium Dichromate

It is available in the form of orange red crystals. It is soluble in water. In neutral or acidic solution, potassium dichromate furnishes nascent oxygen and thus acts as an excellent oxidizing agent. It is used in garment industry as an oxidizing agent and as mordant in dyeing.

6. Potassium Permanganate

It acts as a powerful oxidising agent in neutral, alkaline or acidic solution and hence used in the garment industry as an oxidising agent.

7. Sodium Perborate

Sodium perborate is mainly used as a bleaching agent for a variety of fabrics namely wool, cotton, rayon, linen etc. It is also used as an oxidising agent and dye fixing agent.

8. Sodium Hypochlorite

Sodium hypochlorite liberates hypochlorous acid and thus acts as a powerful oxidizing and bleaching agent. It is used in textile and garment industry for bleaching process.

9. Sodium Bisulfite, NaHSO3

An aqueous solution of sodium bisulfite is obtained when an aqueous solution of sodium carbonate is saturated with sulphurdioxide. It is an important reducing agent and is used as an antichlor after bleaching garments with chlorine.

10. Sodium Hydrosulfite

It is used as reducing and bleaching agent in garment and textile industry.

11. Sodium Metabisulfite

On heating, it decomposes into sodium bisulfite and sulfur dioxide and hence it is an important reducing agent. It is used as an antichlor after bleaching garments with chlorine.

12. Sodium Sulfite

It forms colorless crystals very soluble in water. It is decomposed by dilute mineral acids with the evolution of sulfur dioxide. It is used as mild bleaching agent for silk and woollen fabrics and as an antichlor after chlorine bleach.

13. Sodium Sulfide

Its aqueous solution shows and alkaline reaction due to hydrolysis. It is used for manufacture of sulfur dyes and as reducing agent in garment industry.

14. Sodium Sulfoxylate Formaldehyde

It is also known as Rongalite C. It is a powerful reducing agent and exerts its full reducing action only at high temperatures. It finds extensive application in garment and textile industry for printing and stripping dyed fabric prior to re-dyeing.

15. Sodium Thiosulfate

It is also know as hypo. It is a colorless, crystalline and efflorescent substance. It is used as an antichlor after bleaching garments with chlorine.

16. Stannous Chloride: It is used as mordant in garment dyeing and printing.

17. Dextrin

It is a modified starch prepared by heat treatment of starch in the dry state, with or without the addition of small quantities of chemicals. It is a white powder, and finds extensive use as sizing and finishing agent.

18 Glucose

It acts as a strong and cheap reducing agent in garment industry.


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Monday, 3 December 2012

Chemicals used in Textile Processing-1






1. Acetic Acid

Acetic acid is a colorless and corrosive liquid with pungent smell of its own. It is miscible with water, alcohol and ether in all proportions. Acetic acid is used in garment industry for dyeing purposes.

2. Citric Acid

Citric acid is in the form of colorless, translucent crystals or a white granular to fine crystalline powder. It is used as sequestering agent, as mordanting agent in dyeing and cleansing agent for boiler water.

3. Formic Acid

Formic acid is a colorless and pungent smelling mobile liquid. It is miscible with water, alcohol and ether in all proportions. It acts both as an acid and as reducing agent due to presence of both carboxylic and aldehyde group. Formic acid is used in dyeing wool and cotton fabrics.

4. Hydrochloric Acid, HCl

Hydrochloric acid gas is a colorless, pungent smelling gas with acidic taste. It fumes in moist air and is extremely soluble in water.

5. Nitric Acid, HNO3

Nitric acid is a colorless fuming liquid when pure but may be colored yellow due to its dissociation products mainly nitrogen dioxide. It is a strong acid and acts as a powerful oxidizing agent. Nitric acid is used in the manufacture of dyes.

6. Oxalic Acid, HOOC.COOH.2H2O

Oxalic is a colorless, crystalline solid with two molecules of water of crystallization. Oxalic acid is used in garment and textile industry for the removal of ink stains from cloths and bleaching of straw for hats. Its antimony salts are used as mordant for dyeing and printing.

7. Liquid Ammonia, NH4OH

Ammonia is a colorless gas with characteristic pungent odor and an alkaline taste. It is used as a cleansing agent for removing grease in dry cleaning.

8. Caustic Soda ( Sodium Hydroxide), NaOH

Caustic soda is a deliquescent white crystalline solid, which readily absorbs moisture and carbon dioxide from the atmosphere. It is used for mercerizing cotton.

9. Soda Ash ( Washing Soda), Na2CO3

Sodium carbonate is a white crystalline solid containing water of crystallization. It is used in laundry as washing soda. It is also used for softening water.

10. Sodium Bicarbonate ( Baking Soda), NaHCO3

Sodium bicarbonate is available in the form of white crystals, sparingly soluble in water. It is alkaline in nature.

11. Sodium Silicate 

Liquid alkaline Sodium silicate is mostly used in garment industry as a fixing agent and for rendering the garments fire proof.

12. Trisodium Phosphate, Na3PO4

It is a white crystalline solid soluble in water. It is used as detergent in garment processing.

13. Common Salt

It is used as to exhaust dyeing with direct and reactive dyes.

14. Diammonium Hydrogen Phosphate

It is used in printing paste as an acid liberating agent.

14. Glauber Salt, Na2SO4.10H2O

It is used in dyestuff, textile and garment industry. In textile and garment industry, it is added to the dye bath for cotton fabrics to promote dye exhaustion.

15. Magnesium Chloride

It is a colorless, crystalline deliquescent substance soluble in water. It is used in textile and garment industry for sizing, dressing and filling of cotton and woollen fabrics, for thread lubrication or carbonization of wool.

16. Tatar- Emetic

Potassium Antimonyl Tartarateis known as Tartar-emetic. It is used as mordant in large quantities in garment and textile industry.

17. Zinc Chloride

It is a white deliquescent solid exceedingly soluble in water. The concentrated aqueous solution of zinc chloride dissolves cellulose.

18. Zinc Sulphate ZnSO4.7H2O

It is a crystalline solid very soluble in water. It is used as mordant in printing.

---to be continued---


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Tuesday, 21 February 2012

Textile Softners



Softness of fabric depends upon several factors, these are:
1.       Composition of the Fiber: The more crystalline region a fiber has, the less soft will be the fabric. Thus viscose is more soft than cotton as it has less crystalline region than cotton.
2.       Softness of Yarn: It depends upon the twist. The higher the twist, the less soft will be the yarn and hence less soft will be the fabric.
3.       Weave: Loose weave give more softness to the fabric than closer weave. Thus a fabric made with satin or twill weave will be more softer than that made with plain weave. 
Chemical softening is done by using chemicals which act as a lubricating agent and permits sliding of the fibers in the fabric. However, washing can eliminate these chemicals. Therefore they are applied during the final stage of the treatment.
The most common type of Chemical Softeners are:

1.       Non Ionic softeners: These are less efficient than anionic or cationic softeners, but they can withstand the effects of hard water. They can also sustain themselves in acid and basic environments and thus are most suitable for normal washing.

2.       Anionic Softeners: These are very good and give the fabric a full hand. However they cannot sustain hard water and acid environment. They can also cause yellowing at certain  temperatures.

3.       Cationic Softeners: They are amongst the best of the softeners. However they can cause dye toning. Also they can affect the color fastness to light.

4.       Silicone Based Softeners: These are insoluble in water and therefore must be applied on the fabric after dissolution in organic solvents. They have good fastness to washing. They create a lubricating film on the surface and give fabric a velvety silky hand.

5.        Reactive Softeners: These products have to be cross linked and provide permanent softness and water repellency.               

Monday, 16 January 2012

Factors influencing the cost of Processing



A very good treatment of the topic is given in this article



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Monday, 17 October 2011

What are Plisse and Burnout Prints



Plissé Prints

The plisse prints are created by application of strong alkali to 100% cotton fabric. The alkali is applied in a pattern. After some time ( usually several minutes) the fabric is washed so that the alkali is removed. This results in the shrinkage of fabric from those areas where alkali is applied. This shrinkage causes puckering in the areas where alkali is not applied. A seersucker type appearance can be given to the fabric by applying the print pattern in parallel stripes. The alkali can be applied using direct or resist methods. 

http://ny-image0.etsy.com


Burn Out Prints

A beautiful "burn out" effect can be created by applying strong mineral acids or acid salts in the selected areas of a cotton polyester blended fabric. The acids will cause cotton to be destroyed and the polyeste rremains. Thus very beautiful lacey designs can be imparted to the fabric. Also in the burn out paste, a disperse dye can be incorporated which will also dye the polyester which burnout is taking place. However, due to the corrosive nature of the process special protections need to be taken.



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Sunday, 29 May 2011

Indigo Dyeing using Fermentation Vat



Some Notes on Indigo Dyeing using Fermentation Vat

1. Indigo itself doesn not exist as such in nature. It is easily formed by oxidation of a a part of plant called IndigoFera by exposure to air. 

2. Simply speaking, Indigo itself is a blue solid. It is insoluble in water, acid and alkalies. If Hydrogen is added to it, or chemically speaking it is "reduced" by many reducing agents- It changes to "Indigo White" which is colorless. This indigo white can dissolve in water, in presence of alkalies, to a bright yellow liquid. When Textile substance is dipped in it and exposed to air, white indigo takes up oxygen and get converted into blue coloring matter. 

3. In fermentation method water is made alkaline with the the addition of Lime or Alkali. Then substances are added which can ferment easily in the presence of alkali, for example wheat bran (madder is added to expedite the fermentation). It takes about two to three days to ferment and then indigo is added. This bath can be used for several days or even weeks. Fresh indigo and other ingredients are added from time to time. The color of bath is light greenish yellow in color with a blue or bluish green scum. Goods immersed in this bath turns yellow. When they are taken out and exposed to air, the yellow color quickly changes to blue.

3. The color of the bath is very important. If it is bright yellow, it means too much alkalanity and more indigo should be added. If the color is too dark, it needs more lime or other alkali. 

4. After the color has changed, the goods should be rinsed well in two or three waters. After that should be boiled for several minutes in a soap bath to washoff the loose dyestuff and prevent rubbing. Rubbing can also be prevented by building up deep shades by successively dippings in the moderately weak vats, rather than obtaining the shade once for all. 

Here are some tips (Source)

1. Keep the vat covered. The level of water in the pot should be to the brim.

2. Wet out your fibers well. Any air remianing in the fiber will oxidise the indigo in the vat. 

3. Enter the fiber into the vat very carefully, to avoid any air in the wet. 

4. Always work under the vat. 

5. For greens, dye with indigo first. Then rise well and overdye with alum mordant and any yellow dye ( traditionally Turmeric). For purples, dye the Indigo first, rise well, mordant and dye with any red dye. 

Remember, you can use various chemicals to  reduce the indigo vat. The alkalnity of these chemicals vary from Soda Ash ( Sodium Carbonate), Slaked Lime ( Calcium Hydroxide), Sodium Hydrosulphide to Caustic Soda ( Sodium Hydroxide) in that order(from low to high). 

Sources


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Monday, 10 January 2011

Types of Dyes used in Handblock Printing



The following is a brief description of the chemical dyes used in handblock printing in India:

Pigment dyes
Pigment colors are mixed with kerosene and a binder. The mixed color can be stored for a few days. The motif is printed directly on white or light-colored ground with a variety of pigment colors. Pigment colors are widely popular today because the process is simple, the mixed colors can be stored for a period of time, subtle nuances of colors are possible, and new shades evolve with the mixing of two or three colors. Also the colors are visible as one prints and do not change after processing. Colors can be tested before printing by merely applying it onto the fabric. The pigment color is made up of tiny particles, which do not dissolve entirely and hence are deposited on the cloth surface while rapid dyes and indigo sols penetrate the cloth.

Rapid fast Colors
In this process, the ground color and the color in the design are printed on white and/or light-colored grounds in one step. The dyes once mixed for printing have to be used the same day. Standard colors are black, red, orange, brown and mustard. Color variation is somewhat difficult and while printing it is not possible to gauge the quality or depth of color.

Discharge Dyes
These dyes are used if you need to print onto a dark background. Medium to dark grounds are dyed on fabric with specially prepared dyestuff . The printing colors then used on the fabric contain a chemical that interacts with the dye. This interaction simultaneously bleaches the color from the dyed ground and prints the desired color on its place. Areas can also be discharged and left white. The primary advantage of this process is that vivid and bright colors along with white can be printed on top of medium and dark grounds. 
    
Napthol
These are two sets of chemicals which upon reaction produce a third chemical essentially colorful in nature. Fabric is dyed in one and later printed with the other. The chemical reaction produces a third color. However, the biggest drawback of this process is that there are just a few chemicals available which produce colors upon reaction.

See the images of these prints here : http://www.sashaworld.com/learn/learnframe.htm              


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Saturday, 11 September 2010

What is Glitter Printing



Glitter Printing


Glitter printing enables the fabric to show glittering granules on the fabric. For this Glitter powder is used.

Glitter Powder is generally PET with size of 1/8" to 1/256". It is cut into square and hexagon shape. It is available in metallic, rainbow, laser and iridescent colors. Generally it comes in 25 kg bag. A typical glitter power substance is heat resistant to 170 degree celcius and is acid and alkaline proof. The picture of the glitter powder is as given below:


To Print, first glitter paste is prepared. Glitter powder is added in the Glitter ink, under stirring slowly to avoid lumb formation. Glitter ink is made of acrylic co-polymer. Then it is screen printed using Bull nose squeegee (You can read an excellent manual on squeegee here.) The mesh size should not be more than 20 T (An excellent premier on mesh size can be read here).

One can get an idea of the prices of the chemicals used for glitter printing here.

Source of Picture: http://www.ampmerch.com


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Sunday, 31 January 2010

FAQ about Mercerization



This Article written in early 1900s is a superb treatise on everything about Mercerization:

Here is a list of FAQ that this articles seeks to clarify:

1. Why Mercerization ?

Mercerization was evolved to get over the limitation of silk. It is the high price of silk and low production. On the other hand, a product was needed which could imitate the high lustre, steel-like strength, its attractive smoothness and softness, its elasticity and and its quality of taking the most delicate tints and shades in the dyeing process.

2. What is Mercerization

Mercerization is a process applied to cotton yarn or fabrics which gives to the cotton fiber a silk-like luster, greater strength than ordinary cotton and a greater affinity for dyes.

3. How it is done

The cotton is soaked in strong caustic soda or caustic potash solution for a few moments under stretch and then washing in pure water to remove the caustic.

4. What happens to the structure of cotton during Mercerization

In natural condition the cotton fiber is a flat, twisted, ribbon-like filament. When immersed in caustic solution it swells out and takes on a round and a hair like appearance, and becomes plump instead of flat.

5. What happens to the chemical structure of cotton during Mercerization

The cellulose is changed into hydro-cellulose or cellulose-hydrate.

6. Why mercerized cotton takes dyes so quickly. 

Cellulose cannot be dyed so easily. Hydro-cellulose on the other hand, absorbs almost any kind of dye readily. Mercerised cotton takes dyes so fast, that chemicals are added in the dye bath to check the process in order that the dyes may not enter so rapidly as to render the shading uneven.

7. What is role of stretch during mercerisation.

Stretch causes the luster, the more the stretch the more the lustre. However, after a certain point, the stretch causes a decrease in strength. 

8. How mercerization is done actually ? What are the chemicals added and other process parameters.

9. Apart from Caustic Soda, what other chemicals can be used for Mercerisation, what are their limitations. 

10. Why sometimes Carbon disulphide is added in mercerisation. 

11. Should bleaching be done before or after mercerisation

12. What pre-processes ensure better luster in Mercerisation processes

Please refer to the article.

13. What type of Cottons are suitable for Mercerisation

Longer cottons are more suited to get as much natural luster as possible. Similarly combed cotton lend themselves better to Mercerisation than carded cottons. 

14. What is part Mercerisation. How it is used in produces various fabrics.

Taking a cotton blend, and then mercerising will produce an effect called as crepon effect. Similarly, mercerisation can be used to produce seersucker effect by Mercerising only certain stripes on the warp direction by covering the rest of the cloth by suitable means.

15. How to identify Mercerised Cotton

(This method has not been tried by me. Please take all precautions including consultation from a chemical scientist before attempting)


Mercerized cotton may be determined as follows: A solution is prepared by dissolving 140 gms of potassium iodide in about 475 ml of water. To this solution add 30-60gms of iodine, and mix with another solution made by dissolving 850 gms of zinc chloride in 350 gms of water. The cloth sample should first be soaked in water, immersed in this prepared solution for three minutes, and then rinsed in water. Mercerized cotton will have a deep blue color, while unmercerized cotton will wash out white. The blue of this solution on mercerized cotton will show through quite heavy dyes.

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Friday, 24 July 2009

Weekly Website Review- Dyeman



"There are no bad dyes - only bad dyers" is the punch-line of Batik Oetoro , who are suppliers of textile materials, service and know-how to the artists.

The website is well structured and brimming with information.

Click on dyes and you get to see a colorful assortment of dyes. Move down and you will find the dyeing instructions for that class of dyes. There is also a dye receipe for hand painting of the fabrics. Also dyeing instructions for all possible applications are given. For example the following techniques are explained for acid dyes:


1.Dip dyeing
2.Hand painting - chemical water fixation
3.Hand painting - Drimafix fixation
4.Tie dyeing
5.4 Minutes rapid fixation method
6.Polychromatic printing


Under "Fabric Decorating", some marvellous techniques using dyes such as Devore and Marbelling are given.

Though the site was last updated in 2008, you can get an idea about the cost comparison of the different classes of dyes.

There is also an automatic calculator which convert virtually every weight and volume measurement into teaspoons.
I really love their most comprehensive instructions on natural dyes .
They also have instructions for dyeing silk/viscose blend.
For the curious, they have a list of common names used for chemicals .
For the beginner a summary of dyes is given.
Of course, they have a glossary of terms .

Sunday, 12 July 2009

Rapid Dyes



The Rapid dyes are stabilized azoic dyestuffs.

 They are applied to the fibers in one operation.

 Bright full colors are obtained with very good fastness properties.

 These are used for printing backgrounds so that the foreground becomes prominent. Hence these are suitable where large areas of ground need to be colored.

 Rapid dyes are mixed with water and boiled with caustic soda and a gum paste. A receipe for rapid dyes is given here.

The shades in rapid dyes are unpredictable since the color that is mixed is different from the final color.

True colors emerge only after the fabric has been printed and washed in a mild sulphuric acid solution.

Also these dyes should be used on the same day.

Some colors such as pure blacks are extremely sensitive to weather. Similarly red colors in rapid is vibrant in summers and mediocre in winter

Tuesday, 7 July 2009

How to Dye Using Indian Natural Dyes



To Dye the Fabric with natural dyes, we proceed as follows:

Tanning

1. Take 20% Harda powder on the weight of material.

2. Make into a smooth paste , add about 10 liters of water.

3. Soak the fabric in this bath for 10-15 minutes.

4. Work it well and dry.

5. After drying remove the extra unfixed harda powder by brushing.

Mordanting

1. Take about 200 gms of alum or 50 gms of Potassium Dichromate or 200 grams of copper sulphate accoding to the color desired.

2. Add 20 liters of water

3. Mix well

4. Enter the Harda Treated material into the dyebath and work well

5. Keep of 10-15 minutes

6. Squeeze and wash once in plain water to remove excess of mineral salt.

Developing

Please see the "Developing of Color" Section of the article "How to Print Using Indian Natural Dyes" .  

Saturday, 4 July 2009

Defects in Sulphur Dyeing



Defects in Sulphur Dyeing

1. Tendering

Tendering in the fabric takes place because sulphur is converted into sulphuric acid after oxidation which is harmful for the cellulosic fibers. This defect can occur on account of not proper washing of the fabric after dyeing which results in retaining of sulphuric acid on the cloth.

2. Uneven Dyeing and Oxidation Marks

This may occur due to:

a. Lower strength of sodium sulphide

b. Using improper amount of sodium sulphide.

c. Sodium sulphide does not wash off fully after washing.

d. Variation in temperature.

e. If colors are not dissolved properly, or colors are not of good quality

f. If the chemical used for oxidation is not of good quality

g. Fabrics are not worked upon properly at the time of dyeing.


3. Bronziness

This defect normally occurs in heavy shades. Given below are the reasons:

1. More time gap between dyeing and washing

2. Using more of less strength sodium sulphide

3. Using more salt.

4. Oxidiser doesn't get washed off properly during washing

5. Sodium sulphide doesn't get washed off properly during washing.

6. More presence of iron and copper ions in water.


4. Poor colorfastness to rubbing

It depends upon:

a. type of color
b. Lower strength of sodium sulphide
c. Poor absorbency of the fabric
d. Fabric is not washed properly
e. The quality of soap used for washing is not proper
f. Dyeing bath made of iron instead of steel
g. Frequent addition of colors and chemicals
h. Using Cationic finishing agent in finishing also lowers the colorfastness to rubbing
i. Improper color solution, Improper material to liquor ratio etc.

5. Roughness in Fabric

1. Using more amount of sodium sulphide that doesn't get washed off during washing.
2. Heavier shade
3. Improper washing
4. Not using anionic softening agent in finishing
5. Not using wetting agent.

Monday, 22 June 2009

How to Improve Colorfastness in Vat Dyeing




Colorfastness Problems in Vat Dyeing- Reasons and Remedies

Causes of Poor Colorfastness in Vat Dyeing

Frequent addition of colors in the dye bath to match the shade. It disturbs the equlibrium between colors and chemicals.

- Improper oxidation

- Improper washing

- Some peculiar colors such as blue and brown also leads to this defect.

- Hardness in the water used

- Mixing of incompatible colors

- Usage of large quantities of reducing agent and alkali

- Improper temperature

- Improper wringing of the cloth

- Faults in the machine

- Not using essential chemicals such as dispersing agent or leveling agents.

- Dyeing in a finished cloth ( Resin or Silicon Finish)

- Improper preparation of the cloth or thread for dyeing ( Like not removing impurities or size)

How to improve colorfastness in Vat Dyeing

1. Dont frequently add colors during dyeing

2. Ensure proper reduction clearance

3. Ensure proper oxidation

4. Choose right colors and chemicals

5. Control Temperarue

6. Use soft water

7. Add Dispersing or levelling agent as per need

8. Dont redye finished cloths

9. Ensure proper washing after dyeing.

10. Treat the material with small amount of Ammonia and Sodium Hydrosulphite

11. Treat the cloth with large amount of reducing agent and alkali. This method can be resorted to if there is some bleeding in the colors.

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