Sunday, March 10, 2019

WHEN DENIM GOES SPIRITUAL – TURMERIC DENIM










In recent years the usage of natural dyes has witnessed its revival.The natural dyes are eco-friendly, harmless and non-toxic in nature.

Turmeric plays an important role in yore old great Indian Tradition, as an antiseptic agent to protect their immunities.

Be it using in all dishes of Vegetables, Sambar or
applying turmeric to the bride and groom or
In festivals – like Khandobha (Sonyachi Jejuri).

What we may not know is turmeric has been used as a fabric dye for hundreds of years.

Not only yellow color is produced through dyeing with turmeric dyeing but many other colors are produced when turmeric dye is mixed with other colors, like orange, green, blue color with addition of indigo and red color with addition of kusum flowers and mango rind.

We might think how both red and yellow colors are produced through turmeric dye in its original form, the answer lies in the type of liquid used for concentration. When the solution is prepared in acidic liquid it would produce yellow dye and when alkali liquid is used it would produce red dye.

The challenge of creating the ideal jeans is never-ending. Thanks to antiseptic nature, Turmeric Denim, may offer a new R&;amp;amp;amp;D Avenue.


Tuesday, December 11, 2018

Metrics – Global Raw Material Competitiveness of Indian Cotton Textile Industry

 1. Cotton, the major raw material accounts for 40 to 70% of Yarn, in many cases Fabric Cost.
2. The Trend of International Cotton Prices from 1973 to 2008 is given in Chart below.
3. Raw Material Competitiveness is the difference between the International Cotton Prices and the Domestic Cotton Prices. At the organization level it refers to procurement cost. Yes, the procurement cost - as cotton prices fluctuate 43% within a year.
4. The trend is sharp from 2009 onwards – which is attributed to the commodity till 2011 and the currency from 2012 onwards.
5. Our Home Textiles is becoming stronger in global market. 

Tuesday, August 25, 2015

THE SPONTANEOUS HEATING AND IGNITION OF WET COTTON BALES


Off late, Several Fires happening in Finished Godowns and Raw Material Godowns.

There are internal Safety Committees and Third Party Audits.

Fabrics worth Thousands of Crores are converted into ashes and Cottons worth Hundred of Crores are burnt down in Spinning Mills.

"Known causes" of a series of Cotton Godown fires are concluded as Spontaneous Heating and Ignition of Wet Bales.


Seven decades before

In England, a series of 346 cotton ware house fires happened within a short time, started with a baby step and reached an ugly stage.

Insurance companies are not sure, whether 10 bales are burnt down for a claim of 1000 bales.

DSIR and Fire Research Station Joined hands.

The conclusion is therefore drawn Spontaneous ignition does not occur either in dry or in wet bales of clean cotton.

We have handled several cottons, both Indian and International - from US, Brazil, CIS, African. Pakistan cottons. Some from Uzbekistan have grown in amidst of snow.

The Wet cotton is dangerous due to decolouration of fibres. Yes CIS cottons, one can find bales of Yellow to Brown with a colour grade of upto 83. Yes upto 83.

Ginning poses problem outside 6 to 8 Moisture and it is filtered here itself.

Why one approves wet cotton if it leads him a trade loss?

Spontaneous Heating and Ignition of Wet Cotton Bales are being looked with suspicion over centuries.

Sunday, February 27, 2011

THE DENIM HISTORY - டெனிம் வரலாறு



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This venerable fabric has in almost 150 years, run the gamut from a basic work wear fabric to a fashion trend setter.

People around the globe love denim. It has become symbolic of a casual lifestyle for many.  Denim is affordable, comfortable, and durable and offer variety of style and colour.  It is fashionable and can be dressed up or down.  There’s a fit for everybody.

Denim offers something for everyone.

1.1 How Denim Evolved?

The history of denim is as colourful as the fabric that has ruled the fashion chart of the world for the past fifteen decades.  Denim as a fabric was introduced first in the USA during the Californian Gold Rush.  Levi Strauss was a tent salesman in America who thought the miners in Sanfrancisco needed a rugged pair of trousers that could withstand the rigours of their job.  So he offered them what he had trousers made out of canvas.  Across the Atlantic the French were already using such heavy fabric known by the name Serge-de-Nimes, a name of French city.  Since the French alternative was better and tougher, the Americans too started buying the fabrics from France, discarding the canvas and used the same fabric for trousers with studs etc.  Given the American penchant for cutting the names short the elaborate Serge-de-Nimes quickly became “Denim”.  These trousers caught on and the rest is history.

Fashion-wise denim has gone through many phases.  From its initial indigo dye blue it went through various washes, was over-dyed into colours as vivid as brown, yellow, orange, green and even pink.  It went into streaks and prints and it also turned totally black or remained in its natural state that is ecru or off-white.  But no doubt it is the indigo colour that has returned to every time it has got over a current fad.  Indigo unlike most of the dyes is a crystalline substance.  It gets absorbed by the yarn to limited extent.  It dyes merely the outer layer of the yarn leaving its core white.  In between it imparts several shades of blue.  The crystalline nature of the dye is the reason why the fabric appears bright even when the dye has faded.  The indigo crystals reflect light.  Hence even faded jeans look bright and not dull.

1.2 How Jeans Evolved?

The word jeans is believed to have been coined by Genoese sailors who found it difficult to keep their white trousers clean.  They dyed them with cheapest available colour – Indigo blue.  The Invariably humid and often hot atmosphere on the high seas resulted in the colour fading quite fast.  However, indigo being a crystalline substance some brightness remained even after fading.  This was subsequently became everyday wear for industrial workers and cowhands in 19th century America.  This is how the present day “Denim Jeans” were born.

By World War II, denim jeans had come to be identified with male machoism and celebrated stars like Wayne, Gary Cooper and Clark Gable further pushed the popularity of the jeans by wearing them in their many successful films.  To look manly, thereafter one simply had to wear jeans.

1.3 Denim and Jeans Defined

Denim is defined as a 3/1 warp-faced twill fabric made from yarn dyed warp and undyed weft (Textile Terms and Definitions. The Textile Institute, 1992).  Denim is distinguished from chambray, a flat weave made from similar yarns,  by its 3/1 construction which exposes the dyed warp predominantly on one side and the paler unbleached weft on the other.  Traditionally, denim was dyed with indigo a blue dye originally obtained from natural sources but now manufactured chemically.  While most denim remains’ blue a growing market for other colours has developed.  Most denim is still 100 percent cotton, although a relatively small volume of union denims are produced and traded worldwide.

Jeans are harder to define than denim.  Unless described as denim, they are sometimes made in other fabrics-notably corduroy and lighter flat fabrics for summer wear.  Most manufacturers define jeans as trousers for both sexes with a number of distinctive characteristics, some or all of which may be present.  These include:

-          the so-called waist yoke inserted below the self-supporting waist band at the rear, ensuring a close fit over the buttocks;
-          patch pockets at the rear;
-          double rows of stitches on folded seaming; and
-          in classic versions, metal riverts.

The cut of the rest of the garment may vary to include flares, baggy legs, narrow drain pipes or pleated fullness from the waist at the front of the jeans.

1.4  112 Years Pre-Indian Denim History

The story of how the law of gravity was discovered is well known. Newton was sitting under a tree, under an apple tree, and then one apple fell down. Because of this he started thinking, and he felt that something is pulling the apple downwards. But the law of gravity is only one law. There is another law, which science has yet to uncover it. It is called levitation - “How did the apple reach upwards in the first place? How?”. That must be explained first – how the apple reached the upward position, how the tree is growing upwards. The apple was not there; it was hidden in a seed, and then the apple traveled the whole journey. It reached the upward position and only then did it fall down. So gravity is a secondary law. Levitation was the first and powerful.

Similarly, the water flows downwards; it is under the law of gravity. When it evaporates, suddenly the law also evaporates. Now it is under levitation, it rises upwards.

In denim history,  Levi Strauss, the beverian in 1873, simply become available for the higher law of levitation. In Indian context, it is Sanjay Lalbhai in 1986. The below is the sequence of events between 112 years.

1873   Levi Strauss makes in San Francisco the first jeans using a heavy brown duck fabric for the Californian mine workers.
1873   Levi Strauss produces the first jeans with the designation “501-Indigo”.
1904   Founding of the Blue-Bell Co. in Greensboro, North Carolina.
1950   The first zipper-jeans are introduced in the market.
1954   Marlon Brando and James Dean appear in jeans and thus created a new image for denim.
1960   Denim starts to conquer the world.
1974   The first “pre-washed” jeans appear on the market.
1978   The industry developed a new washing process for denim clothing “stone-wash”.
1986   Birth of Indian denim.

1.5 Blue Revolution in Indian Fashion Industry

The Blue Revolution has taken the Indian industry by storm.  It is a rage among the young and old alike.  The ever blue fabric- Denim- shares the ups and downs of consumers – big and small and is the favourite for fabric designers of clothes and casuals.  No wonder it evokes romance, craze and thrill.

1.5.1 Birth of Indian Denim

The year 1986 marked the birth of Indian denim when Arvind Mills, a member of the Lalbhai Group, set up the first denim plant in Ahmedabad.  Taking this clue from Arvind others K.G, Ashima, Soma, Mafatlals, Aarvee, Century, Raymond Suryalakshmi, Malwa, LNJ, Nahar etc followed.

The one quality of denims which has endeared this material to the vast multitude is its toughness.  It does not crease easily.  Besides it grows brighter with every wash.  While other cotton materials fade and loose their luster with subsequent washes, denim’s luster increases with every wash.

1.5.2 Colour Options

With different weights in denims – 6 to 16 ozs and a variety of colours ranging from light blue to dark blue the utility of denims has increased. To name a few 

Super Dark Denim :Stay blue and stay black indigo products with differential tonal effects for younger generation.

Tinted Denim Cotton denims enriched with different colour cast by tinting or over dyeing technology .

Vintage Dusk Grey cast effect or give unique, second hand look.

Added to this are the different washes – stone wash, bleach wash, hand wash, acid wash, rinse wash, water wash, ink wash, camel wash etc. and over-dyed, printed denims and even coated denims.  Today we have colours like olive, hunter green and over-dyed black.

1.5.3 Fibre and Yarn  Options

Beginning of twenty first century saw the explorations in different yarn options with the development of wide range of characteristic yarns, and their usage in rains, streaks and crosshatch denims. To name a few

Tencel Denim: Woven century luxury cellulosic fibre made from specially grown woods and transformed in non-chemical process which give feel of silk and comfort of cotton.

Stretch Denim: Woven with lycra from Dupont, stretch is the established fashion fabric for women and recently in menswear niche segments too who believes in exact fit and comfort.

Chinos: Two ply chino denims in indigo dyed shade have an unique soft hand feel, Fabric cover and a luxurious appeal.

Polyester Blends: Cotton rich polyester denims with superior hand feel, luster and colour contrast for fashion market.

Rain Denim: Novelty loom denim with a fine weave & premium 'Run' effect for an unique appearance.

Crosshatch Denim: high fashion denim with enhanced fabric texture

1.5.4 Denim for Kids

Today denim is the basis of the Indian fashion industry in many cases.  Children’s wear is one of the largest consumers of the fabric after men’s wear discovered the benefits of this fabric.  No fabric has been as suitable for the rough and tumble use of children’s wear as denim has been.  It is durable and tough and when used in different weights the designing possibilities are limitless.

1.5.5 Denim for Teens

To the present generation jeans means disco.  They mean casual wear or party wear.  The teenagers consider it fit to even jeans at weddings, parties, office etc. Jeans has different connotations for different people.  In the U.S. of America there have been reports of several bride-grooms wearing jeans at the nupitals.  With film stars seeing the trend the present day jet-setter feels that you can appear at the “Rock Around the Clock” only if you are donning the “in” apparel – jeans.


1.5.6 Denim For all  

Today denims don’t just mean jeans.  It means a multitude of things-skirts, jackets, bags, accessories and even shoes.  Cotton dresses have patches of denim material.  The age group which considers denims as fashion wear is 16 to 28. The high profile jeans culture is finally here and urban youngsters particularly are lapping them up as soon as they appear on shop-shelves. Sarees and even Salwar Kameez are being discarded in favour of jeans; something very elegant and more in keeping with the youngish look of the mini-skirted young.  Minis moved out to be replaced by jeans.

The emergence of international brands of jeans in India such as Lee, Wrangler, Levis, Calvin, Klien, Jordache and Pepe further supports the potential of jeans in India.  Indian brands which are already popular in jeans are Flying Machine, Numero, Blue Lagoon, Unnex, Buffalo, UFO, Avis etc.  Besides there are atleast 150 brands which are in the market on dealer support. 

Indian denim is constantly scaling new heights.  It is successfully competing with the other brands which are popular abroad and has carved a niche for itself in the world market by catering to international standards.  No fabric has been as hardsold by it’s manufacturers as denim has been and it is not surprising to read of overnight successes in the readymade garment business with denim as the base fabric.


DENIM PRODUCTION TECHNOLOGIES டெனிம் தொழில்நுட்ப உற்பத்தி முறைகள்




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2.1 DENIM PROCESS SIMPLIFIED: FROM FIBRE TO FABRIC

Denim process begins with the spinning of raw cotton to cotton yarn. Hundred percent cotton still remains the preferred fabric despite attempts made by denim manufacturers in India and abroad to introduce union denims which has not found any wide acceptance either in the international or Indian market.  Spinning is followed by dyeing of warp yarn to required shades and other weaving preparatory treatments like sizing etc. The yarn is woven into fabric and the fabric is subjected to various finishing processes. The finished material is then checked, packaged and delivered to customers. The production of fabric mainly involves spinning, dyeing and sizing, weaving and processing.

TABLE 2.1 : DENIM PRODUCTION TECHNOLOGIES
Process
Description
Production Technologies
Spinning
Converting raw cotton to yarn
OE/Ring spinning technology
Dyeing & Sizing
Dyeing Cotton Yarn to required shade
Slasher/Rope dyeing systems
Weaving
Converting sized yarn to fabric
Airjet/Rapier
Finishing
Imparting Stability to fabric
Foam/Wet finishing systems

2.2 CHOICE OF TECHNOLOGY & THE PROCESS SEQUENCE

2.2.1 Open End Spinning – v – Ring Spinning

Denim plants have both open-end and ring denim capabilities, although a majority of the capacities are open-end, which historically cater to mass-market denim products. However, open-end plants are also able to manufacture specialty denim fabric with changes to their processes. Ring spun denim is of a higher quality and commands higher prices in the denim fabric market. The process sequence of OE and ring spinning are given in the following Table 
2.2

TABLE 2.2 : SPINNING -PROCESS SEQUENCE

SPINNING
OE  SPINNING TECHNOLOGY
RING SPINNING TECHNOLOGY

Blow room
Blow room

Cards
Cards

Draw frames
Draw frames

OE Spinning
Speed frames


Ring frames


Winders



2.2.2 Rope Dyeing – v – Slasher Dyeing

The rope method is generally used in the mass production of fabrics with set specifications. The slasher method is generally used in smaller scale production of fabrics and allows for modification of specifications. Rope-dyeing technology provides a uniform dye to denim fabric when compared to the slasher-dyeing process. Steps involved in the Slasher Process and Rope process are as follows:


TABLE 2.3 : DYEING - PROCESS SEQUENCE

DYEING & SIZING
SLASHER DYED PROCESS
ROPE DYED PROCESS

Beam Warping
Ball-Warping

Sheet Dyeing and Sizing
Rope-Dyeing


Long chain Beaming


Sizing

2.2.3 Foam Finishing – v – Wet Finishing

While application and distribution of chemicals is quite uniform in wet finishing, the practical alternative to reduce energy bill is to use foam technology. The foam finishing is environmentally-friendlier and reduces pollution. The Table below depicts the process sequence adopted.


TABLE2.4:FINISHING-PROCESS     SEQUENCE

FINISHING
FOAM TECHNOLOGY
WET TECHNOLOGY

Brushing
Brushing

Singeing
Singeing

Finishing(foam)
Finishing(wet)

Antitwisting
Antitwisting

Shrinking
Shrinking



TRADE RECEIVABLES

A decade before… in Textiles. China adopted Mass Production. India into customization. i.e Walmart and Zara. Indian Mills Arvind, Lakshmi, V...