The pile of the rug is created by looping yarn around two warp threads, and then around a guide rod that lies perpendicular to the warp. The looping continues until the end of a row is reached. Once a row is completed, the rod is hammered tight against the row below. The weaver then cuts along the rod with a very sharp knife, cutting open the pile. The rod is removed and the row is beaten down against the previous row once again. The two or three weft threads are then inserted along the top of the row, the weaver slides the metal rod back in above the weft, and a new row is started. This knot is known as a Senna loop. Rug weaving in central Asia east Asia use the Persian or Turkish knotting, in which each knot is tied, trimmed, and packed before the next one is started, resulting in knots that are square, elongated and continuous. Senna loops are tied off only when the weaver changes color or reaches the end of a row. These days many weaving combination such as loop/cut, higher pile/lower pile, silk/wool and natural fiber/wool are used in weaving Tibetan rugs and they are gaining popularity.
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