The knotted carpet is obtained connecting and fixing to a base support spin courts that, fuoriuscendo on one side, form one layer folto, commonly said " hair " of the carpet. The carrying structure is formed in fact from a series of horizontal wires (the weft) interlaced with vertical wires (the warp), on which the colorful wire becomes knotted that forms the design gradually.

The more and more disseminated material from for the knotting is the sheep wool, and moreover the silk, oltreché, more very rarely, the hair of goat or camel. The cotton instead is adapted to form the woven one of base, replaced from the silk for those carpets whose working demands one particularly driven in knotting.

In order to hold in tension the wires of weft and warp during the webbing, devices much several for ages and places were used: from the primitivi sticks supported from pegs, until the great fixed chassis, to which many annodatori could work one next to the other.

This working manual, similar still today to that one of many centuries ago, entrusted to the irripetibile gesture of the single craftsman, renders every carpet a piece only similar to others of one same type, but never identical.

According to the way in which the wires of the hair they come connected to the weft, two are distinguished arrange of knotting: in the so-called node ghiordes (from the name of a village of the Anatolia) the wool wire comes every made time to pass on of two spins adjacent of the warp, alternating a interspazio empty to one full, and forming therefore on the back small and regular costoline; in the node senneh (from the name of a village of the western Persia), instead, the wool wire comes made to pass under a single wire of the warp and then connected to the second: the back appears extremely regular and the knotting turns out more driven in.

The consistency, and therefore the quality and the value of a carpet, are given exactly from the density of the nodes, calculated to the square decimeter of surface. The values limit are between the 500 nodes of the quality carpets more current, to beyond the 10,000 nodes of the carpets of silk of the sixteenth and Diciasettesimo century.