Department Of Textile Engineering
I/A 251,252 Tejgaon Dhaka Bangladesh
Prepared by :
Mazadul Hasan sheshir
Wet Processing Technology (Dyeing)
Organic cotton is that which is grown without insecticide or pesticide.
Organic cotton is grown using methods and materials that have a low
impact on the environment.
Fig.: Organic Cotton Plant
The first organic cotton project started 1990 in Egypt.
Most production is taking place in India, Syria, China, Turkey,
Texas USA, Tanzania and Uganda; although countries in West
Africa, Latin America and the Middle East are also well-established
organic cotton producers.
Organic cotton is currently grown in 23 countries. India is currently
growing over 3/4 of the worlds organic cotton.
The cotton polymer is a liner, cellulose polymer. The cotton polymer
consists of about 5000 cellobiose unit that is it’s about 5000.The most
important chemical groupings on the cotton polymer are the hydroxyl (-OH)
groups. These are also present as methanol groups or
-CH 2OH. Cotton is
a crystalline fiber. Its polymer system is about 65-70% crystalline and
correspondingly about 30-35% amorphous.
Fig.: Chemical Structure of Organic Cotton
Shape & length
Fairly uniform in width, 12-20µm. Length
varies from 1-6cm.Typical length is 2.23.2cm.
At dry > 3.0-5.0 g/d, at wet> 3.3-6.6 g/d
Raw (7-8.5%); Mercerized 11%
Diameter from 11-22µm
• Protecting surface and groundwater quality (eliminating
contaminants in surface runoff)
• Reduced risk in insect and disease control by replacing
insecticide with the manipulation of ecosystems
• Long-term prevention of pests through beneficial habitat
• Conservation of biodiversity
• Eliminate the use of toxic chemicals used in cotton
• Organically grown crops also yield soils with higher organic
matter content, thicker topsoil depth, higher polysaccharide
content, and lower modulus of rupture; therefore reducing
considerably soil erosion.
• Avoid cotton with added chemicals e.g. stay press, stain
resistant, water resistant (containing heavy metals, toxins,
• Natural habitats can be destroyed to grow cotton crops with
conventional farming methods.
• Organic farming and production is more expensive than
As a result of consumer interest, organic cotton fiber is used in everything from
personal care items (sanitary products, make-up removal pads, cotton puffs and ear
swabs), to home furnishings (towels, bathrobes, sheets, blankets, bedding),
children's products (toys, diapers), clothes of all kinds and styles (whether for
lounging, sports or the workplace), and even stationery and note cards.
In addition, organic cottonseed is used for animal feed, and organic cottonseed oil
is used in a variety of food products, including cookies and chips.
Future trends could be hospital and medical applications, industrial and beyond.
Organic cotton can also be found in health and personal hygiene products
(facial care, feminine hygiene and baby diapers, etc).