COTTON

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Cotton is a soft fiber that grows around the seeds of the cotton plant (Gossypium spp.), a shrub native to the Indian subcontinent and the tropical and subtropical regions of Africa and the Americas. The fiber is most often spun into thread and used to make a soft, breathable textile, which is the most widely used natural-fiber cloth in clothing today. The English name derives from the Arabic word al qutun, meaning "cotton fiber". (The Spanish word algodn has the same etymology.) Africa and South America are large providers of cotton.

 

 

Cotton plant buds

 

Cotton plant

 

 

Cotton fibre, once it has been processed to remove seeds and traces of wax, protein, etc., consists of nearly pure cellulose, a natural polymer. Cotton production is very efficient, in the sense that ten percent or less of the weight is lost in subsequent processing to convert the raw cotton bolls (seed cases) into pure fiber. The cellulose is arranged in a way that gives cotton fibers a high degree of strength, durability, and absorbency. Each fibre is made up of twenty to thirty layers of cellulose coiled in a neat series of natural springs. When the cotton boll is opened, the fibres dry into flat, twisted, ribbon-like shapes and become kinked together and interlocked. This interlocked form is ideal for spinning into a fine yarn.

 

 

Cultivation

 

Successful cultivation of cotton requires a long growing season, plenty of sunshine and water during the period of growth, and dry weather for harvest. In general, these conditions are met within tropical and warm subtropical latitudes in the Northern and Southern hemispheres. Production of the crop for a given year usually starts soon after harvesting the preceding autumn. Planting time in spring in the Northern hemisphere varies from the beginning of February to the beginning of June. The area of the United States known as the South Plains is the largest contiguous cotton-growing region in the world. It is heavily dependent on irrigation water drawn from the Ogallala Aquifer. Cotton is a thirsty crop, and as water resources get tighter around the world, economies that rely on it face difficulties and conflict, as well as potential environmental problems. Cotton has led to desertification in areas of Uzbekistan, where it is a major export. In the days of the Soviet Union, the Aral Sea was tapped for agricultural irrigation, largely of cotton, and now salination is widespread.

 

Much cotton production uses varieties produced by genetic engineering.

 

 

Cotton plant

 

Cotton fiber originates from the cotton plant, an important crop in tropical and warm temperate climates. Commercial species of cotton plant are Gossypium hirsutum (U.S.A. and Australia), G. arboreum, G. herbaceum (Asia), and G. barbadense (Egypt).

 

 

Harvested cotton Tennessee 2005

 

Harvested cotton in Tennessee (2005)

 

 

History

 

Cotton has been used to make very fine lightweight cloth in areas with tropical climates for millennia. Evidence has been found of cotton in Mexican caves (cotton cloth and fragments of bloody fibre interwoven with feathers and fur) which dated back to approximately 7,000 years ago. There is clear archaeological evidence that people in India and South America domesticated different species of cotton independently thousands of years ago.

 

Cotton cultivation in the Old World began from India, where cotton has been grown for more than 6,000 years, since the pre-Harappan period. Cotton from the Harappan civilization was exported to Mesopotamia during the 3rd millennium BC, and cotton was soon known to the Egyptians as well. The famous Greek historian Herodotus also wrote about Indian cotton: "There are trees which grow wild there, the fruit of which is a wool exceeding in beauty and goodness that of sheep. The Indians make their clothes of this tree wool." (Book III. 106)

 

In Peru, cotton was the backbone of the development of coastal cultures such as the Moche and Nazca. Cotton was grown upriver, made into nets and traded with fishing villages along the coast for large supplies of fish. The Spanish who came to Mexico in the early 1500s found the people growing cotton and wearing clothing made of it.

 

During the late mediaeval period, cotton became known as an imported fibre in northern Europe, without any knowledge of what it came from other than that it was a plant; noting its similarities to wool, people in the region could only imagine that cotton must be produced by plant-borne sheep. John Mandeville, writing in 1350, stated as fact the now-preposterous belief: "There grew there [India] a wonderful tree which bore tiny lambs on the endes of its branches. These branches were so pliable that they bent down to allow the lambs to feed when they are hungrie." This aspect is retained in the name for cotton in many European languages, such as German Baumwolle, which translates as "tree wool". By the end of the 16th century, cotton was cultivated throughout the warmer regions in Asia and the Americas.

 

India's cotton-processing sector gradually declined during British expansion in India and the establishment of colonial rule during the late 18th and early 19th centuries. This was largely due to the East India Company's de-industrialization of India, which forced the closing of cotton processing and manufacturing workshops in India, to ensure that Indian markets supplied only raw materials and were obliged to purchase manufactured textiles from Britain.

 

The advent of the Industrial Revolution in Britain provided a great boost to cotton manufacture, as textiles emerged as Britain's leading export. The invention of the spinning jenny in 1764 and Richard Arkwright's spinning frame in 1769 enabled British weavers to produce cotton yarn and cloth at much higher rates. From the late eighteenth century onwards, the British city of Manchester acquired the nickname "Cottonopolis" due to the cotton industry's omniprescience within the city, and Manchester's role as the heart of the global cotton trade. Production capacity was further improved by the invention of the cotton gin by Eli Whitney in 1793. Improving technology and increasing control of world markets allowed British traders to develop a commercial chain in which raw cotton fibres were (at first) purchased from colonial plantations, processed into cotton cloth in the mills of Lancashire, and then re-exported on British ships to captive colonial markets in West Africa, India, and China (via Shanghai and Hong Kong).

 

 

Cotton field harvesting Oklahoma 1897

 

Picking cotton in Oklahoma in the 1890s

 

 

By the 1840s, India was no longer capable of supplying the vast quantities of cotton fibres needed by mechanised British factories, while shipping bulky, low-price cotton from India to Britain was time-consuming and expensive. This, coupled with the emergence of American cotton as a superior type (due to the stronger fibres of American plants) encouraged British traders to purchase cotton from slave plantations in the United States and the Caribbean. Due to the enormous quantities of raw cotton required to make cheap bulk exports, British industrialists quickly abandoned expensive raw cotton produced in India in favour of mass-produced cotton from the southern United States, which was much cheaper as it was produced by unpaid slaves. By the mid 19th century, "King Cotton" had become the backbone of the southern American economy. In the United States, cultivating and harvesting cotton became the leading occupation of slaves.

 

During the American Civil War, American cotton exports slumped due to a Union blockade on Southern ports, prompting the main purchasers of cotton, Britain and France, to turn to Egyptian cotton. British and French traders invested heavily in cotton plantations and the Egyptian government of Viceroy Isma'il took out substantial loans from European bankers and stock exchanges. After the American Civil War ended in 1865, British and French traders abandoned Egyptian cotton and returned to cheap American exports, sending Egypt into a deficit spiral that led to the country declaring bankruptcy in 1876, a key factor behind Egypt's annexation by the British Empire in 1882.

 

During this time cotton cultivation in British Empire , especially India, greatly increased to replace the lost production of the American South which had been the main supplier to the English mills. Through tariffs and other restrictions the English government discouraged the production of cotton cloth in India; rather the raw fiber was sent to England for processing. The Indian patriot Gandhi described the process:

1. You English buy Indian cotton in the field, picked by Indian labor at seven cents a day, through an optional monopoly.

2. This cotton is shipped on British bottoms, a three weeks journey across the Indian Ocean, down the Red Sea, across the Mediterranean, through Gibraltar, across the Bay of Biscay and the Atlantic Ocean to London. One hundred per cent profit on this freight is regarded as small.

3. The cotton is turned into cloth in Lancashire. You pay shilling wages instead of Indian pennies to your workers. The English worker not only has the advantage of better wages, but the steel companies of England get the profit of building the factories and machines. Wages; profits; all these are spent in England.

4. The finished product is sent back to India at European shipping rates, once again on British ships. The captains, officers, sailors of these ships, whose wages must be paid, are English. The only Indians who profit are a few lascars who do the dirty work on the boats for a few cents a day.

5 The cloth is finally sold back to the kings and landlords of India who got the money to buy this expensive cloth out of the poor peasants of India who worked at seven cents a day. (Fisher 1932 pp 154-156)

 

In the United States, cotton remained a key crop in the southern economy after emancipation and the end of the civil war in 1865. Across the South, sharecropping evolved, in which free black farmers worked on white-owned cotton plantations in return for a share of the profits (although in reality, the system was little changed from the days of slavery). Cotton plantations required vast labour forces to hand-pick cotton fibres, and it was not until the 1950s that reliable harvesting machinery was introduced into the South (prior to this, cotton-harvesting machinery had been too clumsy to pick cotton without shredding the fibres). During the early twentieth century, employment in the cotton industry fell as machines began to replace labourers, and as the South's rural labour force dwindled during the First and Second World Wars. Today, cotton remains a major export of the southern United States, and a majority of the world's annual cotton crop is of the long-staple American variety.

 

 

Offloading freshly harvested cotton into a module builder in Texas. Previously built modules may be seen in the background

 

Offloading freshly harvested cotton into a module builder in Texas

Previously built modules may be seen in the background

 

 

Pests and weeds

 

The cotton industry relies heavily on chemicals such as fertilizers and insecticides, although a very small number of farmers are moving towards an organic model of production and organic cotton products are now available for purchase at limited locations. These are popular for baby clothes and diapers. Under most definitions, organic products do not use genetic engineering.

 

Historically, in North America, one of the most economically destructive pests in cotton production has been the boll weevil. Due to the US Department of Agriculture's highly successful Boll Weevil Eradication Program (BWEP), this pest has been eliminated from cotton in most of the United States. This program, along with the introduction of genetically engineered "Bt cotton" (which contains a bacteria gene that codes for a plant-produced protein that is toxic to a number of pests such as tobacco budworm, cotton bollworm and pink bollworm), has allowed a reduction in the use of synthetic insecticides.

 

 

Mechanised harvesting

 

Most cotton in the United States, Europe and Australia is harvested mechanically, either by a cotton picker, a machine that removes the cotton from the boll without damaging the cotton plant, or by a cotton stripper, which strips the entire boll off the plant. Cotton strippers are used in regions where it is too windy to grow picker varieties of cotton, and usually after application of a chemical defoliant or the natural defoliation that occurs after a freeze. Cotton is a perennial crop in the tropics and without defoliation or freezing, the plant will continue to grow.

 

The logistics of cotton harvesting and processing have been improved by the development of the cotton module builder, a machine that compresses harvested cotton into a large block, which is then covered with a tarp and temporarily stored at the edge of the field.

 

Cotton continues to be picked by hand in poor countries such as Uzbekistan. 

 

 

Research and promotion

 

Beginning as a self-help program in the mid-1960s, the Cotton Research & Promotion Program was organized by U.S. upland cotton producers in response to cotton's steady decline in market share. At that time, producers voted to set up a per-bale assessment system to fund the program, with built-in safeguards to protect their investments. With the passage of the Cotton Research & Promotion Act of 1966, the program joined forces and began battling synthetic competitors and re-establishing markets for cotton. Today, the success of this program has made cotton the best-selling fiber in the U.S. and one of the best-selling fibers in the world.

 

Administered by the Cotton Board and conducted by Cotton Incorporated, the Cotton Research & Promotion Program works to increase the demand for and profitability of cotton through various research and promotion activities. It is funded by U.S. cotton producers and importers.

 

 

Cotton bath towels in various colours

 

Cotton bath towels

 

 

Uses

 

Cotton is used to make a number of textile products. These include terrycloth, used to make highly absorbent bath towels and robes; denim, used to make blue jeans; chambray, popularly used in the manufacture of blue work shirts (from which we get the term "blue-collar"); and corduroy, seersucker, and cotton twill. Socks, underwear, and most T-shirts are made from cotton. Bed sheets are often made from cotton. Cotton is also used to make yarn used in crochet and knitting. Fabric can also be made from recycled or recovered cotton that would otherwise be thrown away during the spinning, weaving or cutting process. While many fabrics are made completely of cotton, some materials blend cotton with other fibers, including rayon and synthetic fibers such as polyester.

 

In addition to the textile industry, cotton is used in fishnets, coffee filters, tents and in bookbinding. The first Chinese paper was made of cotton fiber, as is the modern US dollar bill and federal stationery. Fire hoses were once made of cotton.

 

The cottonseed which remains after the cotton is ginned is used to produce cottonseed oil, which after refining can be consumed by humans like any other vegetable oil. The cottonseed meal that is left is generally fed to livestock. In the past, cotton seeds were used as an abortifacient, that is, a folk remedy to provoke abortion.

 

Cotton linters are fine, silky fibers which adhere to the seeds of the cotton plant after ginning. These curly fibers are typically less than 1/8in, 3mm long. The term may also apply to the longer textile fiber staple lint as well as the short fuzzy fibers from some upland species. Linters are traditionally used in the manufacture of paper and as a raw material in the manufacture of cellulose.

 

Shiny cotton is a processed version of the fibre that can be made into cloth resembling satin for shirts and suits. However, its hydrophobic property of not easily taking up water makes it unfit for the purpose of bath and dish towels (although examples of these made from shiny cotton are seen.)

 

 

The international cotton trade

 

The United States, with sales of $4.9 billion, and Africa, with sales of $2.1 billion, are the largest exporters of raw cotton. Total international trade is $12 billion. Africa's share of the cotton trade has doubled since 1980. Neither area has a significant domestic textile industry, textile manufacturing having moved to developing nations in Eastern and South Asia such as India and China. In Africa cotton is grown by numerous small holders. Dunavant Enterprises, based in Memphis, Tennessee, is the leading cotton broker in Africa with hundreds of purchasing agents. It operates cotton gins in Uganda, Mozambique and Zambia. In Zambia it often offers loans for seed and expenses to the 180,000 small farmers who grow cotton for it, as well as advice on farming methods. Cargill also purchases cotton in Africa for export.

 

The 25,000 cotton growers in the United States are heavily subsidized at the rate of $2 billion per year. The future of these subsidies is uncertain and has led to anticipatory expansion of cotton brokers' operations in Africa. Dunavant expanded in Africa by buying out local operations. This is only possible in former British colonies and Mozambique; former French colonies continue to maintain tight monopolies, inherited from their former colonialist masters, on cotton purchases at low fixed prices.

 

Uzbekistan produces a large amount of cotton.

 

Fair trade

 

Cotton is an enormously important commodity throughout the world. However, many farmers in developing countries receive a low price for their produce, or find it difficult to compete with developed countries.

 

This has led to an international dispute:

On 27 September 2002 Brazil requested consultations with the US regarding prohibited and actionable subsidies provided to US producers, users and/or exporters of upland cotton, as well as legislation, regulations, statutory instruments and amendments thereto providing such subsidies (including export credits), grants, and any other assistance to the US producers, users and exporters of upland cotton.

 

On 8 September 2004, the Panel Report recommended that the United States "withdraw" export credit guarantees and payments to domestic user and exporters, and "take appropriate steps to remove the adverse effects or withdraw" the mandatory price-contingent subsidy measures. The international production and trade situation has led to 'fair trade' cotton clothing or footwear (Veja Sneakers) being available in some countries. The fair trade system was initiated in 2005 with producers from Cameroon, Mali and Senegal.

 

 

Critical Temperatures

  • Favorable travel temperature range - no lower limit =< 77F (25C)

  • Optimum travel temperature - 68F (20C)

  • Autoignition temperature (for oily cotton) - 248F (120C)

  • Glow temperature - 401F (205C)

  • Fire point - 410F (210C)

  • Autoignition temperature - 765F (407C)

 

Cotton dries out, becomes hard and brittle and loses all elasticity at temperatures above 25C. Extended exposure to light causes similar problems.

 

A temperature range of 25C to 35C is the optimal range for mold development. At temperatures below 0C, rotting of wet cotton stops. Damaged cotton is sometimes stored at these temperatures to prevent further deterioration.

 

 

Old British cotton yarn measures

  • 1 thread = 54 inches (about 137 cm)

  • 1 skein or rap = 80 threads (120 yards or about 109 m)

  • 1 hank = 7 skeins (840 yards or about 768 m)

  • 1 spindle = 18 hanks (15,120 yards or about 13,826 m)

 

Properties of cotton fibers

 

 

Property

Evaluation

Shape

Fairly uniform in width, 12-20 microns; length varies from to 2 inches; typical length is ⅞ to 1 inches.

Luster

low

Tenacity (strength)
Dry
Wet


3.0-5.0 g/d
3.3-6.0 g/d

Resiliency

low

Density

1.54/1.56 g/ccm

Moisture absorption
raw:conditioned
saturation
mercerized: conditioned
saturation


8.5%
15-25%
8.5-10.3%
15-27%+

Dimensional stability

good

Resistance to
acids
alkalies
organic solvents
sunlight
microorganisms
insects


damage, weaken fibers
resistant; no harmful effects
high resistance to most
Prolonged exposure weakens fibers.
Mildew and rot-producing bacteria damage fibers.
Silverfish damage fibers.

Thermal reactions
to heat
to flame

Decomposes after prolonged exposure to temperatures of 150˚C or over.
Burns readily.

 

 

 

 

Hoeing a cotton field to remove weeds Greene County Georgia USA 1941

 

Hoeing a cotton field to remove weeds

Greene County, Georgia, USA, 1941

 

 

 

LINKS and REFERENCE

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