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The Calculation Of Knot Density
Knot density refers
to the number of knots per square inch or per square decimeter.
The higher the number of knots, the finer the weave. Increased
knot density is not synonymous with increased quality. It is only
one of the factors to be considered.
Knot density is
determined by counting the number of knots per horizontal inch
(along the weft) and the number of knots per vertical inch (along
the warp) and then multiplying the numbers together. In practice,
this is sometimes difficult because
individual knots can be difficult to
isolate from the back of the rug and it is generally not possible to
isolate separate knots from the front of the rug.
Usually warps are level and in
the same plane within the rug. If the warps of the rug lie on
the same plane, each knot (whether Symmetrical or Asymmetrical)
will show on the back of the rug as two nodes. This situation is
illustrated in the diagrams shown above.
Sometimes the warps are depressed or offset
so greatly that, from the back of the rug, alternate warps are hidden. If
this occurs, each knot will show on the back of the rug as a single
node. This is diagramed at the right with an example utilizing symmetrical
knots, but this can also occur with asymmetrical knots and different
degrees of warp depression or offset When the warp is offset 90 degrees,
as in the second example, the alternate warps will lie on top of its
predecessor.
Chinese rugs, the number of rugs running horizontally along a linear
foot is determined and this is referred to as a 'line". For example,
a "90-line" carpet has 90 knots per linear foot. Chinese rugs have
severely depressed or offset warps, so you will only see one node of the
knot on the back of the rug.
The knot count in Pakistani rugs is graded as "10/20" or "12/24" with the
first figure being the number of knots per horizontal inch and the second
number being the number on knots per vertical inch. These rugs ( with the
exception of many Bokharas ) also have severely depressed or offset warps,
so you will only see one node of the knot on the back of the rug. |
