Procion Reactive Dyes in Textile Printing -Part 3: Fixation Methods for Procion Printed Fabrics

Procion Reactive Dyes in Textile Printing

Part 3: Fixation Methods for Procion Printed Fabrics

In Part 1, we understood what Procion reactive dyes are, their types, and how printing paste is prepared. In Part 2, we discussed one-stage and two-stage printing processes, alkali timing, paste stability, resist salt, and discharge control.

Now we come to the final and most practical part:

How is the printed colour fixed on the fabric?

In textile printing, applying the colour on the fabric is only one part of the process. The real success of reactive dye printing depends on proper development or fixation.

If the dye is not properly fixed, the printed colour may look good initially but may wash out later.

What Is Fixation in Procion Dye Printing?

Fixation means making the dye react with the fibre so that it becomes permanently attached.

In the case of Procion reactive dyes, fixation happens when the dye reacts chemically with cellulose fibre under suitable conditions of:

• Alkali
• Moisture
• Heat
• Time

This is why printed fabric is not simply dried and finished. After printing, it has to be passed through a suitable development process.

In simple words:
Printing places the colour on the fabric. Fixation attaches the colour to the fibre.

Visual 1: Six fixation methods used for Procion printed fabrics.

Main Methods of Developing Procion Prints

After printing and drying, Procion printed fabrics may be developed by any one of the following methods:

1. Steaming
2. Baking
3. Flash ageing
4. Air-hanging
5. Vat development
6. Pad alkali–batch process

Each method has a different way of providing the required conditions for dye-fibre reaction.

1. Steaming Process

Steaming is one of the most important methods for developing Procion printed fabrics.

In this process, after printing, the fabric is first dried. It is then exposed to steam for a specific time. The steam provides moisture and heat, which help the reactive dye bond with the cellulose fibre.

Steaming Conditions

For fabrics printed with Procion-H and Procion-Supra dyes, the fabric is kept in steam for:

5 to 15 minutes

For fabrics printed with Procion-M dyes, the fabric is kept in steam for:

15 seconds

After steaming, the printed fabric is washed to remove unfixed dye and other chemicals. For viscose fabrics, moist steam is necessary.

Why Steaming Works

Reactive dye fixation needs moisture. Steam supplies moisture and heat together. This helps the dye move into the fibre and react with cellulose.

Steaming is especially useful for Procion-H dyes because they are less reactive and need proper fixation conditions.

2. Baking Process

Baking is another method used for developing Procion printed fabrics.

In baking, heat is supplied in dry form. Because moisture is less available compared to steaming, the recipe usually contains a higher amount of urea.

Urea helps retain moisture and supports dye fixation during heating.

Urea in Baking

When baking is used, the amount of urea is generally kept higher.

Usually, 200 parts of urea are added to 1000 parts of printing paste.

Alkali Used in Baking

For printing with Procion-H, the paste may contain:

15 parts anhydrous sodium carbonate per 1000 parts printing paste

For printing with Procion-M, the paste may contain:

15 parts sodium bicarbonate per 1000 parts printing paste

After printing, the fabric is dried and then baked under suitable conditions.

Baking Conditions for Procion Printed Fabrics

Dye Used	Cotton Temperature	Cotton Time	Viscose Temperature	Viscose Time
Procion-Supra	140°C	5 minutes	150°C	5 minutes
Procion-H	140°C	5 minutes	150°C	5 minutes
Procion-M	110°C	3 minutes	140°C	3 minutes

Visual 2: Steaming uses moist heat, while baking uses dry heat.

3. Flash Ageing Process

Flash ageing is a rapid development process. It is completed in two stages and is used for quickly fixing selected Procion dyes on cotton and viscose fabrics.

This process is based on the pad-steam method.

How Flash Ageing Works

1. The fabric is printed with a paste containing Procion dye and thickener, but without alkali.
2. The printed fabric is dried.
3. The fabric is padded with a cold alkaline solution containing salt.
4. Immediately after padding, the fabric is passed through a steamer.
5. The dye is rapidly fixed.

The key point is that alkali is not present in the original printing paste. It is applied later. This improves paste stability and printing quality.

Advantages of Flash Ageing

1. Since there is no alkali in the printing paste, printing quality is improved.
2. Fixation is completed in a very short time, about 40 seconds.
3. Printed fabric can be stored before development because alkali has not yet been applied.

Flash Ageing Printing Paste Recipe

Ingredient	Quantity
Urea	50 parts
Water	580–510 parts
Procion dye	10–80 parts
Sodium alginate	350 parts
Resist salt	10 parts
Total	1000 parts

In this recipe, urea is warmed with water. For Procion-H dye, it is heated up to about 90°C. For Procion-M dye, it is heated up to about 70°C. The dye is then added and dissolved with continuous stirring. After this, sodium alginate containing resist salt is added and mixed thoroughly.

Padding Solution for Flash Ageing

Ingredient	Quantity
Magnesium metasilicate	100 parts
Anhydrous sodium carbonate	150 parts
Anhydrous potassium carbonate	50 parts
Sodium chloride	100 parts
Water	500 parts
Gum	100 parts
Total	1000 parts

4. Air-Hanging Process

The air-hanging process is a simple method of developing Procion printed fabrics. It does not require large equipment, which makes it attractive in situations where steaming or baking facilities are not available.

However, it has one important limitation:

Procion-H dyes do not develop well by this method.

Air-Hanging Method

1. Pad the unprinted fabric with 2% soda ash and dry it.
2. Prepare Procion dye paste without adding alkali.
3. Print the soda-ash-treated fabric with this alkali-free paste.
4. Keep the printed fabric in air for several hours.

If the atmosphere is warm and humid, the results are better because reactive dye fixation needs moisture.

5. Vat Development

In vat development, the printing paste is prepared without alkali. After printing, the fabric is dried and then passed through a warm alkaline solution.

This method also follows the principle of keeping alkali separate from the printing paste.

Alkaline Solution for Vat Development

Ingredient	Quantity
Caustic soda, 38°Bé or 70°Tw	60 parts
Sodium carbonate, anhydrous	150 parts
Potassium carbonate, anhydrous	50 parts
Sodium chloride	100 parts

Water is added to make the total 1000 parts. This solution is warmed to 95–98°C.

6. Pad Alkali–Batch Process

The pad alkali–batch process is useful where steaming and baking facilities are not available.

In this method also, the fabric is printed with a paste that does not contain alkali. After printing, the fabric is padded with sodium silicate solution. Then the fabric is batched without drying.

Sodium Silicate Solution

Property	Value
Ratio by weight, SiO2 : Na2O	2.0
Specific gravity at 20°C	1.5
Viscosity at 20°C	200 centipoise

Batching Time

Dye Type	Batching Time
Procion-M	10 minutes
Procion-Supra or Procion-H	Up to 3 hours

To prevent the fabric from drying, it is covered properly with a polythene sheet. After batching, the fabric is washed thoroughly and dried.

Visual 3: Two-stage fixation routes where alkali is applied separately.

Comparison of Fixation Methods

Method	Main Principle	Alkali Position	Suitable Situation
Steaming	Moist heat fixation	Usually in paste	When steaming equipment is available
Baking	Dry heat fixation	Usually in paste	When baking equipment is used
Flash ageing	Alkali padding followed by rapid steaming	Applied after printing	Fast fixation and better paste stability
Air-hanging	Alkali on fabric, development in air	Applied before printing	Simple method, warm humid air helpful
Vat development	Warm alkaline treatment after printing	Applied after printing	Alkali-free paste and later development
Pad alkali–batch	Sodium silicate padding and batching	Applied after printing	Useful when steaming/baking is unavailable

Washing After Fixation

After fixation, washing is essential. The purpose of washing is to remove:

• Unfixed dye
• Thickener
• Alkali
• Salts
• Other auxiliaries

If washing is not done properly, the fabric may show poor washing fastness, staining, harsh handle, or shade dullness.

Important point:
In reactive dye printing, washing is not a minor finishing step. It is part of the quality of the final print.

Practical Notes for Textile Students

The six fixation methods may look different, but they all aim to achieve the same final result: the dye must react with cellulose fibre.

The difference lies in how each method provides alkali, moisture, heat and time.

• Steaming provides moist heat.
• Baking provides dry heat, supported by higher urea.
• Flash ageing applies alkali later and fixes quickly.
• Air-hanging uses alkali-treated fabric and atmospheric moisture.
• Vat development uses a hot alkaline bath.
• Pad alkali–batch uses sodium silicate padding and controlled batching.

Once this logic is understood, the methods become easier to remember.

Common Mistake

A common mistake is to think that once fabric is printed and dried, the process is complete.

It is not. In Procion reactive dye printing, drying only removes water. It does not necessarily fix the dye completely.

Fixation requires the correct combination of alkali, moisture, temperature and time.

Knowledge Nugget

All fixation methods are different ways of answering the same question:

How do we create the right conditions for the Procion dye to chemically bond with cellulose?

That is the heart of reactive dye printing.

Reflection Question

Why can pad alkali–batch processing be useful where steaming and baking facilities are not available?

Because the fabric can be printed without alkali, padded later with sodium silicate, batched under covered conditions, and then washed and dried after fixation.

Final Summary

Procion reactive dye printing is successful only when the dye is properly fixed on the fibre. The main fixation methods include steaming, baking, flash ageing, air-hanging, vat development and pad alkali–batch processing.

Each method has its own logic, equipment requirement and suitability. The printer must choose the method based on dye type, fabric type, available machinery, paste stability and production conditions.

For students, the most important understanding is this:
Printing gives the design, but fixation gives durability.

Without proper fixation, even a beautiful print may fail during washing.

Disclaimer and Safety Note: This article is intended for educational and informational purposes only. The recipes, chemical names, quantities, temperatures and process conditions mentioned here are provided to explain the principles of Procion reactive dye printing and should not be treated as direct instructions for unsupervised practical use. Textile printing involves the use of dyes, alkalis, salts, thickeners and other auxiliary chemicals, which should be handled only with proper knowledge, suitable safety precautions and appropriate supervision. Before using any chemical, always refer to the latest supplier technical data sheet, safety data sheet and applicable local regulations. Use appropriate personal protective equipment, ensure good ventilation, safe storage, careful measurement, spill control and responsible disposal of chemical residues and wastewater. The author and publisher do not accept responsibility for any loss, damage, injury or environmental harm arising from the direct or indirect use of the information given in this article, and readers are advised to consult trained textile processing professionals before attempting any laboratory or industrial application.

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Procion Reactive Dyes in Textile Printing - Part 2: One-Stage and Two-Stage Printing Processes Explained

Procion Reactive Dyes in Textile Printing

Part 2: One-Stage and Two-Stage Printing Processes Explained

In Part 1, we understood the basic nature of Procion reactive dyes, their classification, and the ingredients used in a typical printing paste. We saw that Procion dyes are suitable for cotton and viscose because they form a chemical bond with cellulose fibres under alkaline conditions.

Now we come to the next important question:

How is the printing process actually controlled?

In Procion dye printing, the key point is not only which dye is used, but also when alkali is introduced into the system. This gives rise to two broad methods of printing:

1. One-stage process
2. Two-stage process

Understanding this difference is very important because it affects paste stability, fixation, shade development, and print quality.

Visual 1: One-stage vs two-stage Procion dye printing process.

Why Alkali Timing Matters

In reactive dye printing, alkali plays a central role. It activates the reaction between the dye and the cellulose fibre.

But alkali also creates a practical problem.

Once alkali is mixed with the dye paste, the dye becomes more active. This means the dye may start reacting or losing strength even before it reaches the fabric. Therefore, the timing of alkali addition becomes very important.

A simple way to understand it:
Alkali is necessary for fixation, but if introduced too early, it can reduce paste stability.

This is why textile printers choose either a one-stage or two-stage process depending on the dye class, production requirement, and available equipment.

One-Stage Process

In the one-stage process, alkali is already present in the printing paste.

The fabric is printed with this complete paste, and then the printed fabric is fixed by a process such as:

• Steaming
• Baking

Since dye and alkali are present together in the same paste, the system is ready for reaction once the right moisture, temperature, and time are provided.

How the One-Stage Process Works

The general sequence is:

1. Prepare the printing paste with dye, thickener, urea, resist salt, water, and alkali.
2. Print the fabric.
3. Dry the printed fabric.
4. Fix the colour by steaming or baking.
5. Wash the fabric to remove unfixed dye and auxiliaries.

This method is convenient because the printing paste already contains the necessary ingredients for fixation.

Advantages of the One-Stage Process

The one-stage process is relatively simple to understand and operate.

Its advantages include:

• Fewer processing steps
• Alkali is already present in the paste
• Suitable for processes where immediate fixation is planned
• Convenient for steaming or baking-based fixation

However, the limitation is that the paste may not remain stable for long, especially when highly reactive dyes are used.

Limitation of the One-Stage Process

The biggest limitation is paste stability.

If the dye is highly reactive, the presence of alkali in the paste may make the paste unstable. This is especially important in the case of Procion-M dyes.

Procion-M dyes are highly reactive. Therefore, their paste should not be prepared too much in advance. It should be prepared only in the quantity needed for immediate printing.

Two-Stage Process

In the two-stage process, the printing paste is prepared without alkali.

The alkali is applied separately, either before or after printing.

This means the dye paste remains more stable because the chemical trigger, alkali, is not present in the paste at the beginning.

How the Two-Stage Process Works

There are two possible approaches.

1. Alkali Before Printing

The fabric may be treated with alkali first, dried, and then printed with dye paste that does not contain alkali.

This approach is seen in processes such as air-hanging, where the fabric may be padded with soda ash before printing.

2. Alkali After Printing

The fabric may first be printed with a paste that does not contain alkali. After printing and drying, the alkali is applied by padding or another suitable method.

This approach is used in processes such as:

• Flash ageing
• Vat development
• Pad alkali–batch process

Advantages of the Two-Stage Process

The two-stage process gives better control over the reaction.

Its advantages include:

• Better paste stability
• Cleaner printing in many cases
• Useful where the printed fabric has to be stored before development
• Better control over fixation
• Suitable for processes where alkali is applied separately

In this method, the dye and alkali are kept apart until the required stage. This prevents premature reaction and helps maintain paste quality.

One-Stage vs Two-Stage Process

Point	One-Stage Process	Two-Stage Process
Alkali position	Present in printing paste	Applied separately
Paste stability	Lower, especially with reactive dyes	Better
Process simplicity	Simpler	More controlled but involves an extra step
Fixation method	Usually steaming or baking	Alkali treatment before or after printing
Best suited for	Immediate fixation	Controlled fixation and better paste life

Visual 2: Why alkali timing controls paste stability and fixation.

Paste Stability of Different Procion Dyes

The stability of printing paste depends largely on the reactivity of the dye.

Procion-H and Procion-Supra

The paste of Procion-H and Procion-Supra dyes can remain usable for a long time, up to about 28 days.

This is because these dyes are not as highly reactive as Procion-M.

Procion-H is the least reactive among the three groups, so its paste stability is good. Procion-Supra has intermediate behaviour and also shows reasonable paste stability.

Procion-M

The paste of Procion-M does not remain stable for long.

Because Procion-M dyes are highly reactive, their paste should be prepared only as much as required.

This is a very practical production point.

If Procion-M paste is prepared in excess and stored for too long, the dye may lose its effectiveness and the final print may suffer.

Compatibility of Procion Dye Classes

Most Procion dyes can be used together to obtain different shades. However, compatibility depends on their reactivity.

Important practical rule:
Procion-H and Procion-M dyes should not normally be used together.

This is because Procion-H is slow-reacting, while Procion-M is highly reactive. Their fixation behaviour is different, and this may create difficulty in obtaining proper shade development.

However:
Procion-Supra and Procion-H can be used together.

This is because their behaviour is more compatible in practical printing conditions.

Role of Resist Salt in Procion Printing

During roller printing, it has been observed that colour may sometimes go to the back side of the fabric. This can affect the appearance and quality of the print.

To control this problem, resist salt is used.

Resist salt helps in preventing unwanted effects during printing and is especially useful where controlled print definition is required.

It is also used in discharge printing.

Resist Salt and Discharge Printing

In discharge printing, a reducing or discharge agent removes colour from selected areas of the fabric.

However, one practical problem may occur.

Sometimes the discharge effect does not remain limited only to the printed area. The surrounding area may also get affected. This can spoil the sharpness of the design.

To prevent this, the fabric may be treated before printing with a mild oxidizing agent.

Examples include:

• Sodium nitrobenzene sulphonate
• Sodium chlorate

These chemicals help neutralize the unwanted effect of reducing or discharge agents that may spread beyond the printed area.

Why Oxidizing Agents Are Used

If a discharge or reducing agent comes out from the printing paste and spreads to surrounding areas, it may unintentionally affect the fabric.

When the fabric has already been treated with a mild oxidizing agent, the reducing effect is reduced or neutralized.

In simple words:
The oxidizing agent protects the surrounding fabric from unwanted discharge.

This helps maintain cleaner print boundaries and reduces accidental damage to nearby areas.

Visual 3: Resist salt and oxidizing agent help control unwanted printing effects.

Foam Control in Printing Paste

Sometimes chemicals may also be added to the printing paste to prevent foam formation.

Foam can create problems during printing because it may lead to uneven application, spots, weak print areas, or poor design clarity.

Therefore, foam control is another small but important part of printing paste management.

Development After Printing

After the fabric is printed and dried, the colour has to be developed or fixed.

The main development methods include:

1. Steaming
2. Baking
3. Flash ageing
4. Air-hanging
5. Vat development
6. Pad alkali–batch process

These methods will be discussed in detail in Part 3.

Important point:
Printing applies the dye design, but development fixes the dye onto the fibre.

Without proper development, the dye may remain unfixed and may wash out.

Practical Understanding for Students

The difference between one-stage and two-stage printing is not merely a process detail. It is a way of controlling the chemistry of reactive dye printing.

In one-stage printing, the dye and alkali are together in the paste. This makes the process simpler, but paste stability can become a concern.

In two-stage printing, dye and alkali are kept separate until the desired stage. This improves control and paste stability but adds another process step.

The printer must balance:

• Dye reactivity
• Paste stability
• Print sharpness
• Fixation method
• Production timing
• Available machinery

This is why textile printing is both a chemical and practical craft.

Common Mistake

A common mistake is to think that alkali should always be added directly into the printing paste.

That is not always true.

In many processes, alkali is deliberately kept out of the paste and applied separately. This is done to improve paste stability, print quality, and process control.

Knowledge Nugget

In Procion dye printing, alkali is the trigger, but timing is the control.

Adding alkali at the right stage is one of the most important decisions in the printing process.

Reflection Question

Why does a two-stage process generally give better paste stability than a one-stage process?

The answer is simple:

Because the dye and alkali are kept separate until the desired stage of fixation.

Disclaimer and Safety Note: This article is intended for educational and informational purposes only. The recipes, chemical names, quantities, temperatures and process conditions mentioned here are provided to explain the principles of Procion reactive dye printing and should not be treated as direct instructions for unsupervised practical use. Textile printing involves the use of dyes, alkalis, salts, thickeners and other auxiliary chemicals, which should be handled only with proper knowledge, suitable safety precautions and appropriate supervision. Before using any chemical, always refer to the latest supplier technical data sheet, safety data sheet and applicable local regulations. Use appropriate personal protective equipment, ensure good ventilation, safe storage, careful measurement, spill control and responsible disposal of chemical residues and wastewater. The author and publisher do not accept responsibility for any loss, damage, injury or environmental harm arising from the direct or indirect use of the information given in this article, and readers are advised to consult trained textile processing professionals before attempting any laboratory or industrial application.

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Silk Fabric Terms Explained — Part 3: Chiffon, Chiffon Twist, Georgette and Crepe-Georgette Yarn

In Part 1, we created a practical map for understanding silk fabric terms.

In Part 2, we discussed important silk yarn terms such as raw silk, bivoltine silk, China silk, katan and organzine.

Now we move to one of the most interesting areas of silk fabrics:

Twist-based sheer fabrics.

This part will explain terms such as chiffon, chiffon twist, crepe georgette, georgette crepe fabric and crepe/georgette yarn.

These terms are very important because they show how a simple change in yarn twist can change the entire character of a fabric.

A silk yarn may be smooth.

But when it is given very high twist, it becomes lively.

It starts developing torque.

It tries to curl, contract and create texture.

This behaviour gives us fabrics like chiffon, georgette and crepe.

Central idea: In chiffon and georgette, twist is not only inside the yarn. Twist becomes visible on the fabric surface.

Twist-based silk fabric map: yarn twist, torque, openness and surface texture. Click image to view full size. Generated by AI- can have mistakes

Why Twist Matters So Much in Silk

Silk is a filament fibre. It is naturally long, fine, smooth and lustrous.

Because silk filaments are continuous, they can be twisted in different degrees to create different yarn behaviours.

A low-twist silk yarn may give a smooth, soft and lustrous fabric.

A high-twist silk yarn may give a crinkled, grainy, springy or lively fabric.

This is why twist is one of the most powerful tools in silk fabric construction.

Twist Level	Yarn Behaviour	Fabric Effect
Low twist	Smooth, soft, stable	Smooth silk fabrics
Medium twist	Balanced, stronger	General woven silk fabrics
High twist	Lively, torque-rich	Chiffon, georgette, crepe effects

Low twist gives smoothness. High twist gives texture and liveliness.

This one line helps us understand chiffon and georgette better.

Understanding TPI and TPM

Before discussing chiffon and georgette, we must understand two units:

TPI means twists per inch.

TPM means twists per metre.

Both measure how many turns are inserted into the yarn.

A yarn with higher TPI or TPM has more twist.

In silk chiffon and crepe yarns, twist may be very high. For example, chiffon twist may range from about 2,000 TPM to 4,000 TPM, which is approximately 50 to 100 TPI.

This high twist gives the yarn a tendency to kink or contract. When such yarns are woven and finished, they create the characteristic texture and handle of chiffon or georgette.

Simple Conversion Idea

Since 1 metre is about 39.37 inches:

TPM ≈ TPI × 39.37

So:

• 50 TPI is approximately 1,968 TPM
• 100 TPI is approximately 3,937 TPM

That is why 50–100 TPI is roughly similar to 2,000–4,000 TPM.

1. Chiffon

Chiffon is a very light, sheer and open fabric made from hard twisted yarns.

Silk chiffon is made from raw silk in both warp and weft directions. The yarns are highly creped and twisted, generally in the range of about 50 to 100 TPI, or 2,000 to 4,000 TPM.

Chiffon is known for its delicate, transparent and flowing character.

Practical Understanding

Chiffon is not just a thin fabric.

It is a combination of:

• fine silk yarn,
• high twist,
• open construction,
• light weight,
• and sheer appearance.

Because of this, chiffon has a floating quality. It does not behave like a dense silk fabric. It has movement, transparency and softness.

In garments, chiffon is often used where lightness and drape are required.

Why Chiffon Looks Sheer

Chiffon looks sheer because of two major reasons:

1. Fine yarns are used
2. The fabric construction is open

When fine yarns are woven with enough spacing, light passes through the fabric easily. This gives chiffon its transparent look.

The high twist gives the fabric liveliness and slightly rougher handle compared to very smooth silk fabrics.

Chiffon in simple words: Chiffon is a light, sheer silk fabric made from highly twisted yarns in an open construction.

2. Chiffon Twist

Chiffon twist is a hard twisted single raw silk thread used for making chiffon, mousseline de soie and similar fabrics.

The twist is usually very high, about 2,000 TPM to 4,000 TPM.

This means chiffon twist is not the fabric.

It is the yarn used to make the fabric.

This is an important distinction.

Chiffon vs Chiffon Twist

Term	Meaning
Chiffon	The fabric
Chiffon twist	The highly twisted yarn used to make chiffon

Many students confuse the two.

But once we understand the difference between yarn and fabric, the confusion disappears.

Why Chiffon Twist Is Hard Twisted

The yarn is hard twisted to give it:

• strength,
• liveliness,
• slight crepe effect,
• and better fabric behaviour in sheer construction.

If the yarn were very soft and loosely twisted, it would not produce the same chiffon character.

The beauty of chiffon comes partly from its lightness and partly from the behaviour of hard twisted yarn.

Chiffon and georgette comparison: sheerness, yarn twist, surface texture and fabric handle. Click image to view full size. Generated by AI- can have mistakes

3. Crepe/Georgette Yarn

Crepe/georgette yarn is a twisted yarn usually having about 2,000 TPM to 3,600 TPM. It is generally made of two threads of raw silk.

This yarn is used to create georgette or crepe-like effects in fabric.

The important word here is twisted.

Like chiffon twist, crepe/georgette yarn has high twist. But its use and arrangement in the fabric create the specific georgette or crepe appearance.

Practical Understanding

Crepe/georgette yarn helps create:

• grainy surface,
• slight crinkle,
• springy handle,
• better drape,
• and less flat appearance.

A fabric made from such yarn does not look completely smooth. It has a subtle texture.

This texture is often valued because it gives the fabric depth and movement.

4. Crepe Georgette

Crepe georgette is a sheer fabric similar to chiffon, made with crepe yarn that gives the fabric a crepe appearance.

This definition immediately tells us two things:

1. It is sheer like chiffon.
2. It has a crepe appearance because of crepe yarn.

So crepe georgette can be understood as a fabric between chiffon and crepe.

It has transparency and lightness like chiffon, but with more surface texture.

Chiffon vs Crepe Georgette

Feature	Chiffon	Crepe Georgette
Appearance	Very sheer and delicate	Sheer but more grainy
Surface	Relatively smoother	Crepe-like texture
Yarn	Hard twisted yarn	Crepe yarn
Handle	Light and flowing	Slightly heavier, grainier and springier
Common use	Flowing garments, scarves, overlays	Sarees, dresses, dupattas, flowing garments

The difference is often felt by touch.

Chiffon feels lighter and more delicate.

Georgette feels slightly grainy and has more body.

5. Georgette Crepe Fabric

Georgette crepe fabric is a fine, lightweight, open-texture fabric usually in plain weave. It is made from crepe yarns, generally with two Z-twisted and two S-twisted yarns in both warp and weft.

This is a very important technical definition.

Let us break it down.

Fine and Lightweight

Georgette is generally fine and light. It is not a heavy fabric.

Open Texture

The fabric has an open structure. This gives it sheerness and drape.

Plain Weave

Most georgette fabrics are plain woven. The texture does not mainly come from a complex weave. It comes from the yarn twist and arrangement.

S and Z Twist Arrangement

This is the heart of georgette.

The fabric uses yarns twisted in two directions:

• S twist
• Z twist

When these are arranged in a controlled way, the torque balances and the surface becomes grainy rather than distorted.

The definition mentions two Z-twisted and two S-twisted yarns in both warp and weft.

This arrangement helps create the characteristic georgette surface.

Understanding S Twist and Z Twist

S twist and Z twist describe the direction in which a yarn is twisted.

If the slope of the twist follows the middle part of the letter S, it is called S twist.

If the slope follows the middle part of the letter Z, it is called Z twist.

This may look like a small technical detail, but it has a big effect in high-twist fabrics.

When only one twist direction is used, the yarns may create imbalance. But when S and Z twists are used alternately, the fabric can become more balanced while still retaining texture.

Practical Note

A good georgette is not just made by using high-twist yarns randomly.

It depends on controlled arrangement.

The balance of S and Z twist gives the fabric its grainy texture, drape and stability.

S twist and Z twist arrangement in georgette fabric. Click image to view full size. Generated by AI- can have mistakes

Chiffon, Georgette and Crepe: How They Are Related

Chiffon, georgette and crepe are related because all three can involve high twist.

But they are not the same.

Fabric	Main Character	Role of Twist
Chiffon	Very light, sheer, open fabric	High twist gives liveliness
Georgette	Sheer, grainy, slightly springy fabric	S/Z crepe yarns create texture
Crepe	Crinkled, puckered or pebbly fabric family	High twist may create crepe surface

So chiffon is more about lightness and sheerness.

Georgette is about sheerness with grain.

Crepe is about crinkled or pebbly surface.

Technical Note: Why High Twist Creates Texture

When high twist is inserted into a filament yarn, the yarn stores energy. This energy is called torque.

The yarn tries to untwist or contract.

When such yarn is woven and later relaxed or finished, the torque causes small distortions in the fabric surface.

This creates:

• crinkle,
• grain,
• puckering,
• pebbly effect,
• and a lively handle.

This is why high twist yarns are used in chiffon, georgette and crepe fabrics.

The yarn remembers the twist, and the fabric shows it.

That is a beautiful way to understand twist-based fabrics.

Practical Note for Merchandisers and Buyers

When buying chiffon, georgette or crepe-type fabrics, the name alone is not enough.

Ask the supplier:

Question	Why It Matters
Is the fabric silk or synthetic?	Many chiffons and georgettes are now polyester or nylon
What yarn is used?	Yarn type affects handle, strength and drape
Is the yarn high twist?	Required for true chiffon/georgette character
What is the twist level?	Helps assess fabric authenticity and behaviour
Is S/Z twist used?	Important for georgette texture and balance
What is the fabric weight?	Affects transparency, fall and end use
Is the fabric plain weave?	Many chiffon/georgette fabrics are plain woven
Is the fabric finished or heat-set?	Important especially in synthetic versions

For example, a fabric may be sold as “georgette”, but it may simply be a lightweight synthetic fabric with a georgette-like finish.

Similarly, a “chiffon” may not be silk chiffon. It may be polyester chiffon.

So the technical question is not only:

Is it chiffon?

The better question is:

What yarn, twist, fibre and construction are creating the chiffon effect?

Common Confusions

Confusion 1: Chiffon and Georgette Are the Same

They are not the same.

Both are light and sheer, but chiffon is generally more delicate and transparent, while georgette has a more grainy crepe-like surface.

Confusion 2: Chiffon Twist Means Chiffon Fabric

Chiffon twist is the yarn.

Chiffon is the fabric.

The yarn creates the fabric character, but the two terms are not identical.

Confusion 3: Georgette Is a Weave

Georgette is usually plain woven. Its character comes mainly from crepe yarns and S/Z twist arrangement, not from a special georgette weave.

Confusion 4: All Crepe Fabrics Are Georgette

Georgette may be a type of crepe-like sheer fabric, but all crepes are not georgettes.

Crepe is a broader family.

Confusion 5: Transparency Alone Makes Chiffon

No.

Transparency is only one feature. Chiffon also requires lightness, open construction and highly twisted yarns.

Knowledge Nugget

A fabric name is often a shortcut.

But the fabric itself is a result of technical decisions.

For chiffon and georgette, the important decisions are:

• how fine the yarn is,
• how much twist is inserted,
• whether S and Z twist are balanced,
• how open the weave is,
• and how the fabric is finished.

So a good textile person does not stop at the name.

He asks: What is producing the effect?

That one question converts market vocabulary into textile knowledge.

Quick Recap

Term	One-line Meaning
Chiffon	Very light, sheer, open fabric made from hard twisted yarns
Chiffon twist	Hard twisted single raw silk thread used for chiffon
Crepe/georgette yarn	Highly twisted yarn, generally made from two raw silk threads
Crepe georgette	Sheer fabric similar to chiffon but with crepe appearance
Georgette crepe fabric	Fine, lightweight open fabric made from S and Z crepe yarns

Main lesson: Chiffon and georgette are best understood through yarn twist, openness and surface texture.

Reflection Questions

1. Why does high twist create liveliness in silk yarn?
2. What is the difference between chiffon and chiffon twist?
3. Why is georgette usually grainier than chiffon?
4. Why are S and Z twist yarns used together?
5. Why is transparency alone not enough to define chiffon?

Final Words

Chiffon and georgette are beautiful fabrics, but their beauty is not accidental.

It comes from fine yarns, high twist, open construction and careful arrangement of S and Z twist.

Chiffon teaches us how lightness and openness can create delicacy.

Georgette teaches us how twist can create grain and movement.

Crepe teaches us how yarn behaviour can become fabric surface.

So when we touch a chiffon or georgette fabric, we are not only touching silk.

We are touching twist.

We are touching yarn behaviour.

We are touching construction.

And that is why textile terminology is not just a list of words.

It is a way of understanding how fabric is born.

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Silk Fabric Terms Explained — Part 2: Understanding Silk Yarns

In Part 1, we created a practical map for understanding silk fabric terms.

We saw that a silk fabric name may tell us about fibre, yarn, twist, weave, finish, handle or traditional usage.

Now we will begin with the most basic layer: silk yarn.

This is important because before silk becomes chiffon, georgette, crepe, kora, habutai or matka, it first exists as yarn. The character of the yarn decides the character of the fabric.

A smooth silk yarn gives one type of fabric.

A highly twisted silk yarn gives another.

A yarn made from waste or pierced cocoons gives a very different surface.

So, to understand silk fabrics properly, we must first understand silk yarns.

In this part, we will discuss five important terms:

Raw silk, bivoltine silk, China silk yarn, katan and organzine.

Silk yarn journey: silkworm race, cocoon, filament, raw silk, twisted yarn and fabric. Click image to view full size.

Why Yarn Terms Matter in Silk

In cotton, wool or synthetic fabrics, yarn is also important. But in silk, yarn becomes especially important because silk is a filament fibre.

A filament is a long continuous fibre. Silk filament is obtained from the cocoon of the silkworm. Several fine filaments are brought together to form a silk thread.

This is different from cotton, where many short fibres are twisted together to make yarn.

Because silk is naturally long, fine and lustrous, small changes in yarn preparation can create large differences in the final fabric.

For example:

Yarn Condition	Fabric Effect
Silk with natural gum	Firmer handle, more body
Degummed silk	Softer handle, higher lustre
Twisted silk	Better strength and weaving performance
Highly twisted silk	Crepe, chiffon or georgette effect
Waste silk yarn	Irregular, textured, rustic appearance

So when we hear a silk fabric name, we should not ask only, “Is it silk?”

We should ask: What kind of silk yarn has been used?

1. Raw Silk

Raw silk is the silk thread reeled from cocoons by drawing together the required number of filaments. It still contains its natural gum, known as sericin.

This gum is important.

Sericin acts like a natural coating on the silk filament. Because of this, raw silk has more body and stiffness than fully degummed silk.

In simple words:

Raw silk is silk before the full removal of natural gum.

This does not mean that raw silk is unfinished in a careless way. It means that the gum is still present and is part of the yarn’s behaviour.

Practical Understanding

Raw silk generally feels firmer than degummed silk. It may have more body, more stiffness and less softness.

This is useful in weaving because the gum can give strength and protection to the yarn.

In many traditional silk fabrics, raw silk is used deliberately. The gum helps in maintaining body during weaving and finishing.

Why Raw Silk Matters to Merchandisers

A merchandiser should not treat raw silk and soft finished silk as the same.

Raw silk may affect:

• fabric handle,
• drape,
• lustre,
• dyeing behaviour,
• finishing behaviour,
• and customer perception.

If a customer expects very soft, fluid silk and receives a firmer raw silk fabric, she may feel that the fabric is not comfortable. But for certain products, that firmer handle may be exactly what is required.

So raw silk should be understood as a technical condition, not merely a market word.

2. Bivoltine Silk

Bivoltine silk refers to cocoons produced by a silkworm race having two generations or life cycles in a year.

The word can be divided into two parts:

Bi means two.

Voltine refers to the number of broods or generations in a year.

So, bivoltine silk comes from silkworm races that complete two life cycles in a year.

Practical Understanding

Bivoltine silk is often discussed in relation to silk quality, cocoon quality and filament quality.

For a textile student, the important point is that bivoltine is not a fabric structure. It is not a weave. It is not a finish.

It refers to the biological production pattern of the silkworm race.

This makes it different from terms like katan or organzine, which refer to yarn preparation.

Common Confusion

A student may think bivoltine silk is a type of fabric.

It is not.

It is connected to the silkworm race and cocoon production.

Correct understanding: Bivoltine silk is a source-quality term, not a fabric-construction term.

3. China Silk

The term China silk has two meanings.

First, it refers to a plain weave, lustrous, lightweight silk fabric traditionally produced in China and Japan.

Second, it can refer to a white raw silk yarn of superior quality from north China.

In this article, since we are focusing on yarn terms, we will consider the second meaning also.

China Silk as a Fabric

As a fabric, China silk is generally light, plain woven and lustrous. The threads may be irregular and soft. It is usually dyed or printed and used for blouses, lingerie, linings and similar products.

Historically, it was handwoven in China using mulberry silk. Later, the term was also applied to machine-made imitations.

China Silk as Yarn

As a yarn term, China silk may refer to a white raw silk yarn of superior quality.

This is important because the same term may refer to both a fabric and a yarn depending on context.

Practical Understanding

Whenever the term China silk is used, ask:

Is the person referring to the fabric or the yarn?

In fabric trade, China silk may mean a light silk fabric.

In yarn or raw material discussion, it may refer to a quality of raw silk yarn.

This is a very good example of why textile terminology must be read contextually.

4. Katan

Katan is twisted filature silk.

This is a short definition, but it is very important.

Let us break it.

Filature silk means silk that has been reeled from cocoons in a controlled way. It is generally smoother and more continuous than spun silk.

When this filature silk is twisted, it becomes katan.

So katan is not merely silk. It is twisted reeled silk.

Practical Understanding

Twist gives silk better strength, body and weaving performance.

In many fine silk fabrics and sarees, katan yarn is valued because it gives a clean, strong and elegant fabric.

A fabric made with katan can have better structure than fabric made with very loosely twisted or untwisted silk.

Katan Cloth

Katan cloth is a plain weave mulberry silk fabric in which double and twisted yarn is used in both warp and weft.

This means that katan cloth is not only about fibre. It is about the use of twisted silk yarn in fabric construction.

Why Katan Matters in Indian Textiles

In Indian saree vocabulary, katan is often associated with richness, strength and fine silk character.

But technically, the important point is:

Katan means twisted filature silk.

Once we understand this, the term becomes clearer.

It is not just a market name. It tells us something about the yarn.

Comparison of raw silk, katan and organzine yarns. Click image to view full size.

5. Organzine

Organzine is a silk yarn used mainly as warp yarn for weaving or knitting.

It is made by twisting single silk threads first. Then two, three or four of these threads are folded together. After folding, they are twisted in the opposite direction to the original single twist.

The twist generally ranges from about 350 to 700 twists per metre.

This construction gives organzine strength, balance and stability.

Why Organzine Is Used in Warp

In weaving, warp yarns face more stress than weft yarns.

Warp yarns are held under tension on the loom. They pass through healds and reed. They experience repeated movement and abrasion.

Therefore, warp yarn must be strong and stable.

Organzine is suitable because its folded and balanced twist structure gives better performance during weaving.

Organzine and Organza Are Different

This is one of the most common confusions.

Organzine is a yarn.

Organza is a fabric.

Organzine may be used in making many silk fabrics. Organza is a sheer, crisp, transparent fabric.

The similarity in spelling creates confusion, but technically they are different.

A simple way to remember:

Organzine = yarn.

Organza = fabric.

How These Yarn Terms Differ

Let us compare the terms clearly.

Term	What It Refers To	Main Meaning	Practical Importance
Raw silk	Yarn condition	Silk with natural gum	Gives body and firmness
Bivoltine silk	Silkworm/cocoon source	Two life cycles in a year	Related to cocoon and filament quality
China silk	Fabric or yarn	Lightweight silk fabric or superior raw silk yarn	Meaning depends on context
Katan	Yarn type	Twisted filature silk	Gives strength and clean appearance
Organzine	Warp yarn	Folded and twisted silk yarn	Strong and stable for weaving

This table shows that all terms do not belong to the same category.

Some are biological terms.

Some are yarn terms.

Some are fabric terms.

Some have more than one meaning.

That is why classification is important.

A Simple Flow from Cocoon to Fabric

To understand these terms better, imagine this sequence:

Silkworm race → cocoon → filament → raw silk → twisted silk yarn → woven silk fabric

Now place the terms in this flow:

Stage	Related Term
Silkworm race	Bivoltine silk
Reeled silk with gum	Raw silk
Superior raw silk yarn from China	China silk yarn
Twisted filature silk	Katan
Folded and twisted warp yarn	Organzine
Plain weave silk fabric	Katan cloth, China silk fabric

This is a much better method than memorising definitions.

When we know where a term fits in the production chain, we understand it more deeply.

Classification of silk yarn terms: source, yarn condition, yarn type and fabric usage. Click image to view full size.

Technical Note: Sericin and Degumming

Silk filament has two main protein components:

Fibroin is the main structural silk fibre.

Sericin is the natural gum that surrounds the fibroin.

When silk is reeled from the cocoon, sericin is still present. This gives raw silk its firmer feel.

The process of removing sericin is called degumming.

After degumming, silk becomes softer, more lustrous and more comfortable. But before degumming, the gum can help the yarn during weaving.

So the decision to use raw silk or degummed silk is not accidental. It depends on the intended fabric and process.

Practical Note for Buyers and Merchandisers

When dealing with silk fabrics or silk yarns, it is useful to ask the supplier a few direct questions:

Question	Why It Helps
Is the silk raw or degummed?	Helps understand handle and finish
Is the yarn reeled or spun?	Helps understand smoothness and irregularity
Is it filature silk?	Indicates continuous reeled silk quality
Is the yarn twisted?	Helps understand strength and fabric behaviour
Is it single, double or folded yarn?	Helps understand body and durability
Is it used in warp or weft?	Helps understand performance in weaving
What is the twist level?	Helps identify chiffon, crepe or organzine type yarns

A fabric name alone is not enough.

For example, two fabrics may both be called “silk fabric”, but one may be made from raw silk, another from katan, another from spun silk and another from synthetic filament.

The buyer should always ask for the yarn story behind the fabric.

Common Mistakes

Mistake 1: Treating Raw Silk as a Fabric Name Only

Raw silk is not only a market category. Technically, it refers to silk thread containing its natural gum.

Mistake 2: Confusing Bivoltine with a Fabric Type

Bivoltine refers to the silkworm race and cocoon production cycle. It is not a weave or fabric construction.

Mistake 3: Confusing Organzine with Organza

Organzine is a yarn. Organza is a fabric.

Mistake 4: Assuming All Silk Yarns Are Smooth

Silk yarns may be smooth, twisted, folded, raw, degummed, spun, waste-based or irregular. Each gives a different fabric character.

Mistake 5: Ignoring Warp and Weft Difference

Some yarns are especially suitable for warp because they have better strength and stability. Organzine is a good example.

Knowledge Nugget

A silk fabric does not begin at the loom.

It begins much earlier.

It begins with the silkworm race, the cocoon, the filament, the gum, the reeling method and the yarn twist.

That is why a good textile person reads silk backwards:

Fabric → weave → yarn → filament → cocoon

The more we understand this chain, the more clearly we understand the fabric.

Quick Recap

In this part, we studied five important silk yarn-related terms:

Term	One-line Meaning
Raw silk	Silk thread containing natural gum or sericin
Bivoltine silk	Silk from silkworm races with two generations in a year
China silk	Lightweight silk fabric or superior white raw silk yarn
Katan	Twisted filature silk
Organzine	Folded and twisted silk yarn mainly used as warp

Main lesson: Silk yarn terms are not just definitions. They explain the behaviour of the final fabric.

Reflection Questions

1. Why does raw silk feel firmer than degummed silk?
2. Why is organzine suitable for warp?
3. How is katan different from ordinary untwisted silk?
4. Why should China silk be understood from context?
5. Why is bivoltine silk not a fabric-construction term?

Final Words

Silk fabrics become easier to understand when we understand silk yarns.

Raw silk explains gum and body.

Katan explains twist and strength.

Organzine explains warp performance.

China silk reminds us that one term may have more than one meaning.

Bivoltine silk takes us even further back, to the silkworm race and cocoon source.

So before asking, “What silk fabric is this?”, we should ask:

What silk yarn is this fabric made from?

That question changes our understanding completely.

In the next part, we will move from yarn to twist-based sheer fabrics and understand chiffon, chiffon twist, georgette and crepe-georgette yarns.

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