While planning the purchase of a handmade carpet, you should consider various quality indicators of the product. Carpet`s density is one of the most important indicator of its quality, on which depends its appearance, price of the carpet and practicality.
Knot density is the number of knots per selected measuring unit (the number of knots is usually counted per square meter or centimeter along the warp and weft). Making logical conclusion, it is not difficult to guess that the higher the density, the more skilled and more complex manufacturing of a carpet is. For better clarity, you can visually compare two handmade rugs: one woolen with low knot density and other the silk one with much higher density.
More dense carpets have higher index of thermal and acoustic insulation. They are more practical and wear-resistant.
Because of the high density the yarn of the rug is so tightly compressed that even in the process of using, dust and small garbage stays on the surface and can’t get deep into the warp. All of this makes cleaning of the carpet considerably easier (dust with no problem is picked up by a vacuum cleaner). If a drop of water or other liquid gets on a highly dense carpet it stays on it as dew on the grass. You can immediately dab it with a dry napkin, so there will be no trace of a liquid on a carpet.
How to determine knot density in a handmade rug and quantity of knots per square meter?
As we already clarified density is obtained by counting the knots per square meter or centimeter, even square inch, in Chinese carpets method of counting by “lines” per foot (30.47 cm) is used. To recount number of lines into number of knots per square meter you need to square the number of lines per foot and then multiply by 10.76.
To count number of knots in a handmade carpet you need to take a ruler, put it on the back side of the rug, count the number of knots along the warp and then along the weft for 1 centimeter and multiply them together. For example, if there are 10 knots along the warp and along the weft, the density of this carpet is 100 knots per square centimeter. For converting into square meter we need to multiply it by 10 000, so carpets density is 1 000 000 knots per square meter.
Handmade rugs can have small, medium and high density.
The price of a finished product depends directly on the material of a carpet, as woolen rug of density around 810 000 knots per square meter is much more difficult to make than silk rug of the same knot density. Wool is a rougher fiber than silk. The densest knotted carpets are made entirely of silk (the warp is also silk).
Density of machine-made carpets
The density of machine-made carpets depends on the type of a quilting machine, the denser the needles the tighter the weave. (Either needles stitch through the backing a tuft of pile, or several sets of needles create loops and they are stitched together and only then backing is applied). Carpets with higher density are more wear-resistant, but have greater weight due to use of more material.
When choosing and buying a carpet always pay attention to the density of the carpet, but do not always seek to buy only the densest item. Small and medium dense carpets with a high pile will be an excellent choice for bedrooms (they are softer and more pleasant to the touch). Highly dense carpets are suitable for living rooms, kitchens, halls or other zones with high traffic.