The sharpening consists in smoothing a part of fabric, generally the Vêtement S has just been washed, in order to withdraw the folds from them. The tool mainly used has domestic iron , although nowadays, this one does not consist any more of Fer.
Technically, sharpening demolishes the bonds between long the Molécules of Polymère of fibers of fabrics. The heated molecules are rectified by the Poids iron then take their new form while cooling. Certain fabrics, such cotton, require a contribution of water so that the intermolecular bonds are demolished. Many modern fabrics (starting from second half of the 20th century) are supposed to require only one simple blow of iron or not of sharpening of the whole.
History
Casserole S out of metal filled with charcoal were used to smooth fabrics in China with. As from the 17th century, in Europe, one starts to use tools in cast iron of triangular form and provided with a handle which one heats in a fire. Thereafter, one used an iron box filled with periodically ventilated hot coals using attached bellows. This type of iron was on sale with the the United States at least until in 1902.In the industrialized world, these designs were replaced by the electric iron, heated by means of a Electrical resistance. The metal part, called sole , is not made any more of iron but of Aluminum, more light. The element of heating is ordered by a Thermostat which maintains the temperature wished. The invention of iron with electrical resistance is allotted to Henry W. Seeley of New York in 1882. The same year, an iron using a Arc of carbon was presented in France, but he was considered to be too dangerous. The first iron using a thermostat appeared in the Années 1920.
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