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An average weaver can tie almost 10,000 knots per day. More difficult patterns with an above-average knot density can only be woven by a skillful weaver, thus increasing the production costs even more. An average weaver may tie 360 knots per hour (one every 10 seconds), while 1200 knots approaches the maximum a skilful weaver can tie per hour. [2]
The knot count is expressed in knots per square inch (kpsi) or per square decimeter. Knot count per square decimeter can be converted to square inch by division by 15.5. Knot counts are best performed on the back of the rug.
After each row of knots is created, one or more strands of weft are passed through a complete set of warp strands. Then the knots and the weft strands are beaten with a comb securing the knots in place. A rug can consist of 25 to over 1,000 knots per square inch.
The rugs produced here are still known, also in the Iran of today, under their trade name "Senneh". They belong to the most finely woven Persian rugs, with knot counts up to 400 per square inch (6200/ dm 2). The pile is closely clipped, and the foundation is cotton, also silk was used in antique carpets.
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A round Nain rug. Nain rugs are produced in Nain, in central Iran, beginning shortly before World War II. They are constructed using the Persian knot, and typically have between 250 and 500 knots per square inch. The pile is wool, spun finer than most Persian wools, and the nap is short. [1]