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Knot density

January 01, 1970

Knot density is a traditional measure for quality of handmade or knotted pile carpets. It refers to the number of knots, or knot count, per unit of surface area - typically either per square inch (kpsi) or per square centimeter (kpsc), but also per decimeter or meter (kpsd or kpsm). Number of knots per unit area is directly proportional to the quality of carpet.[1][2][3][4] Density may vary from 25 to 1,000 knots per square inch (4 to 155 knots per square centimetre) or higher, where ≤80 kpsi is poor quality, 120 to 330 kpsi is medium to good, and ≥330 kpsi is very good quality.[2] The inverse, knot ratio, is also used to compare characteristics.[5][6] Knot density = warp×weft while knot ratio = warp/weft. For comparison: 100,000/square meter = 1,000/square decimeter = 65/square inch = 179/gereh.

Back side of a Qom rug with very high knot density
Ghiordes knot
Senneh knot
The yellow yarn is the pile and the horizontal and vertical yarns are the warp and the woof

For two carpets of the same age, origin, condition and design, the one with the higher number of knots will be the more valuable. Knot density is normally measured in knots per square inch (KPSI) which is simply the number of vertical knots across one inch of carpet multiplied by the number of horizontal knots in the same area. Average knot density varies between region and design. A rug could have a knot density half that of another yet still be more valuable, KPSI is only one measurement of quality and value in Persian carpets.[7]

Knot density is related to and affects or affected by the thickness of the length of the pile and the width of the warp and woof,[8] and also the designs and motifs used and their characteristics and appearance.[8] "In rugs with a high knot density, curvilinear, elaborate motifs are possible. In those with a low knot density (as well as kilims), simpler, rectilinear, motifs tend to prevail."[3] "A carpet design with a high knot density is better adapted to intricate and curvilinear designs, which of necessity must have a shorter pile length to avoid looking blurry. A carpet with a lesser knot density is better adapted to bold, geometric designs and can utilize a long pile for softer, more reflective surface that appeals to the sense of touch."[9]

Hand-tying of knots is a very labour-intensive task. 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]

In the late fifteenth century a "carpet design revolution" occurred, made possible by finer yarns, and before this time it is rare to find carpets with ≥120 kpsi but by the next century carpets with three to four times that density were fairly common.[9] For example, the Pazyryk carpet (ca. 400 BC) is around 234 kpsi and the Ardabil Carpets (ca. 1550 AD) are 300–350 kpsi. A fragment of a silk Mughal carpet in the Metropolitan Museum of Art has a knot density of 2,516 kpsi and a silk Hereke prayer rug (ca. 1970 AD) contains 4,360 symmetric kpsi.[5] However, the rug with the highest knot density is a silk Hereke masterpiece by the Özipeks workshops, having an incredible density of approximately 10,000 kpsi, with a production time of about 15 years.[10]

In Persian, reg (raj, rag, Persian: "row, course") refers to the knots per gereh (Persian: "knot"), which refers to a unit of approximately 2.75 inches (7.0 cm).[5] Dihari is a unit of 6,000 knots used to measure production in India.[5]

See also edit

References edit

  1. ^ "Silk Rug Cleaning - Modern and Oriental Rug Cleaning". MrGreenCarpetCare.com. Retrieved December 13, 2016. The quality of an Oriental rug – and all silk rugs in general, is determined by a most important factor: the rug's knot density.
  2. ^ a b c Goswami, K. K., ed. (2009). Advances in Carpet Manufacture. Woodhead Publishing in Textiles: Number 87. The Textile Institute. p. 239. ISBN 9781845695859. Knot density is an indicator of quality; the greater the number of knots per square inch (kpsi), the better the quality of the carpet.
  3. ^ a b Cucker, Felipe (2013). Manifold Mirrors: The Crossing Paths of the Arts and Mathematics. Cambridge University. p. 89-90. ISBN 9781107354494. The knot density...not only provides a measure of the work required to produce a given rug but also sets limits to the possible designs.
  4. ^ Daniel, Elton L.; Mahdī, ʻAlī Akbar (2006). Culture and Customs of Iran. Greenwood. p. 138. ISBN 9780313320538. Another basic factor in determining the quality of a carpet is knot density...—more knots indicate finer work, better quality, and a higher price.{{cite book}}: CS1 maint: location missing publisher (link)
  5. ^ a b c d Stone, Peter F. (2014). Oriental Rugs: An Illustrated Lexicon of Motifs, Materials, and Origins. Tuttle. p. unpaginated. ISBN 9781462911844. Knot density: 'In a knotted pile fabric, the knots per unit area. The product of the vertical or warp-wise knot count per linear unit measure multiplied by the horizontal or weft-wise knot count per linear unit measure.' Knot ratio: 'In a knotted pile carpet, the vertical or warp-wise knot count per linear unit measure divided by the horizontal or weft-wise knot count per linear unit measure.'
  6. ^ Textile Museum Journal. Vol. 27–37. 1990. p. 68. Knot density itself is less significant than the ratio of horizontal to vertical knot counts.
  7. ^ Murphy, Brian (2006). The Root of Wild Madder: Chasing the History, Mystery, and Lore of the Persian Carpet. Simon and Schuster. p. 47. ISBN 9780743264211. Knot counts appear in almost every carpet book, catalogue, and auction guide. It's a convenient yardstick to compare the intricacy of the work...But it's a seriously flawed method to assess quality or beauty.
  8. ^ a b Tzareva, Elena (1984). Rugs & carpets from Central Asia: the Russian collections. Penguin. p. 12-13. ISBN 9780140063691. The greater the knot density, the thinner the weft and warp yarns and the more weakly are they twisted; the smaller the density, the coarser are the foundation yarns." "In small pieces where a high pile was not required, the knot density was often far greater. As less time was needed to weave smaller items, their makers demonstrated greater care, choosing a more complex design that necessitated a greater knot density.
  9. ^ a b Denny, Walter B. (2014). How to Read Islamic Carpets. Metropolitan Museum of Art. p. 43 & 61. ISBN 9780300208092.
  10. ^ "'probably the Finest Rug in the World' Silk Hereke".

January 01, 1970
knot, density, traditional, measure, quality, handmade, knotted, pile, carpets, refers, number, knots, knot, count, unit, surface, area, typically, either, square, inch, kpsi, square, centimeter, kpsc, also, decimeter, meter, kpsd, kpsm, number, knots, unit, a. Knot density is a traditional measure for quality of handmade or knotted pile carpets It refers to the number of knots or knot count per unit of surface area typically either per square inch kpsi or per square centimeter kpsc but also per decimeter or meter kpsd or kpsm Number of knots per unit area is directly proportional to the quality of carpet 1 2 3 4 Density may vary from 25 to 1 000 knots per square inch 4 to 155 knots per square centimetre or higher where 80 kpsi is poor quality 120 to 330 kpsi is medium to good and 330 kpsi is very good quality 2 The inverse knot ratio is also used to compare characteristics 5 6 Knot density warp weft while knot ratio warp weft For comparison 100 000 square meter 1 000 square decimeter 65 square inch 179 gereh Back side of a Qom rug with very high knot density Ghiordes knotSenneh knotThe yellow yarn is the pile and the horizontal and vertical yarns are the warp and the woof For two carpets of the same age origin condition and design the one with the higher number of knots will be the more valuable Knot density is normally measured in knots per square inch KPSI which is simply the number of vertical knots across one inch of carpet multiplied by the number of horizontal knots in the same area Average knot density varies between region and design A rug could have a knot density half that of another yet still be more valuable KPSI is only one measurement of quality and value in Persian carpets 7 Knot density is related to and affects or affected by the thickness of the length of the pile and the width of the warp and woof 8 and also the designs and motifs used and their characteristics and appearance 8 In rugs with a high knot density curvilinear elaborate motifs are possible In those with a low knot density as well as kilims simpler rectilinear motifs tend to prevail 3 A carpet design with a high knot density is better adapted to intricate and curvilinear designs which of necessity must have a shorter pile length to avoid looking blurry A carpet with a lesser knot density is better adapted to bold geometric designs and can utilize a long pile for softer more reflective surface that appeals to the sense of touch 9 Hand tying of knots is a very labour intensive task 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 In the late fifteenth century a carpet design revolution occurred made possible by finer yarns and before this time it is rare to find carpets with 120 kpsi but by the next century carpets with three to four times that density were fairly common 9 For example the Pazyryk carpet ca 400 BC is around 234 kpsi and the Ardabil Carpets ca 1550 AD are 300 350 kpsi A fragment of a silk Mughal carpet in the Metropolitan Museum of Art has a knot density of 2 516 kpsi and a silk Hereke prayer rug ca 1970 AD contains 4 360 symmetric kpsi 5 However the rug with the highest knot density is a silk Hereke masterpiece by the Ozipeks workshops having an incredible density of approximately 10 000 kpsi with a production time of about 15 years 10 In Persian reg raj rag Persian row course refers to the knots per gereh Persian knot which refers to a unit of approximately 2 75 inches 7 0 cm 5 Dihari is a unit of 6 000 knots used to measure production in India 5 See also editKnot wood Thread countReferences edit Silk Rug Cleaning Modern and Oriental Rug Cleaning MrGreenCarpetCare com Retrieved December 13 2016 The quality of an Oriental rug and all silk rugs in general is determined by a most important factor the rug s knot density a b c Goswami K K ed 2009 Advances in Carpet Manufacture Woodhead Publishing in Textiles Number 87 The Textile Institute p 239 ISBN 9781845695859 Knot density is an indicator of quality the greater the number of knots per square inch kpsi the better the quality of the carpet a b Cucker Felipe 2013 Manifold Mirrors The Crossing Paths of the Arts and Mathematics Cambridge University p 89 90 ISBN 9781107354494 The knot density not only provides a measure of the work required to produce a given rug but also sets limits to the possible designs Daniel Elton L Mahdi ʻAli Akbar 2006 Culture and Customs of Iran Greenwood p 138 ISBN 9780313320538 Another basic factor in determining the quality of a carpet is knot density more knots indicate finer work better quality and a higher price a href Template Cite book html title Template Cite book cite book a CS1 maint location missing publisher link a b c d Stone Peter F 2014 Oriental Rugs An Illustrated Lexicon of Motifs Materials and Origins Tuttle p unpaginated ISBN 9781462911844 Knot density In a knotted pile fabric the knots per unit area The product of the vertical or warp wise knot count per linear unit measure multiplied by the horizontal or weft wise knot count per linear unit measure Knot ratio In a knotted pile carpet the vertical or warp wise knot count per linear unit measure divided by the horizontal or weft wise knot count per linear unit measure Textile Museum Journal Vol 27 37 1990 p 68 Knot density itself is less significant than the ratio of horizontal to vertical knot counts Murphy Brian 2006 The Root of Wild Madder Chasing the History Mystery and Lore of the Persian Carpet Simon and Schuster p 47 ISBN 9780743264211 Knot counts appear in almost every carpet book catalogue and auction guide It s a convenient yardstick to compare the intricacy of the work But it s a seriously flawed method to assess quality or beauty a b Tzareva Elena 1984 Rugs amp carpets from Central Asia the Russian collections Penguin p 12 13 ISBN 9780140063691 The greater the knot density the thinner the weft and warp yarns and the more weakly are they twisted the smaller the density the coarser are the foundation yarns In small pieces where a high pile was not required the knot density was often far greater As less time was needed to weave smaller items their makers demonstrated greater care choosing a more complex design that necessitated a greater knot density a b Denny Walter B 2014 How to Read Islamic Carpets Metropolitan Museum of Art p 43 amp 61 ISBN 9780300208092 probably the Finest Rug in the World Silk Hereke Retrieved from https en wikipedia org w index php title Knot density amp oldid 1174111093, wikipedia, wiki, book, books, library,

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