Cotton is provided by the silky down which recuperates the fruit dun bush: the cotton. This fruit is a more or less lengthened capsule which contains the brown kernels covered with hairs. It is this hairs which constitute the cotton grain. Their length differs according to hope for them (1 - 7 cm). The capsule opens when it is ripe and lets take out cotton.
The cotton in the wild state is an enduring plant. It is cultivated in the humid and hot countries in most cases in the United States, in USSR, in China, in India and in Egypt.
Transformation of cotton
Drying and égrenage: Cotton is left displayed in air and in sun 2 or 3 days, then it is cleared out from capsules and plant rubbish which stuck to grains.
Bet bullet there: The shelled black daily constricted and wrapped in a burlap strapped by currency. These packets called bullets weigh producer from 180 to 340 kg according to the country. These bullets are sent by boats of countries producers towards industrial countries.
Purgation: transform raw material into tablecloth
Parallélisation of grains, transformation of the tablecloth into cordon:
Card: Allow to paralléliser grains and to regroup them to constitute a ruban
Bancs of drawing: Transform the irregular cordon into a régulier
Affinage cordon: Transform the cordon into wisp of smaller diamètre
Filage one: Transform the wisp into thread
The main character is the length (the longest cottons are the finest. The length varies according to the species from 1 to 4)
The sharpness, the elasticity, the flexibility
The vrillement, a cotton can stretch out from 5 to 8 % without breaking because of the vrillement
Glittering or silk manufacturer more or less importing according to the species
The color: white cremates or yellowish
The cleanliness: the cotton is more or less cleared of the impurities
The cotton is constituted by 87 % of cellulose, some water, ashes, proteins, some wax and pectins. Its density is 1,5.
The cotton may retain a big humidity: 8,5 % of its weight in water
The calorific value of the cotton is average and can be increased by scratching.
The cotton is rather good driver of the heat.
The cotton quickly burns with a flame by leaving grey ashes.
The cotton resists to the vast bases.
The cotton is destroyed by acids.