Another topic to be mentioned
is (wool carding) which is very important in carpet production.
Carding method and the
equipments for this process, have undeniable effect on quality of the
carpet. When carding of the wool was not utterly performed and its
alien materials was not exhausted, the cords might stick together and
the yarn would become uneven while spinning, therefore the carpet
becomes uneven and sinuous. Many workshops still, utilize beater's bow
for wool carding.
Grading and classification of
wool depends on its thickness. The smaller grades appropriate to
thicker filaments at 8-10-12-16-18-20-24.
Raw wool has 16 to 70 percent
of un-purity. 90% of wool filaments are formed of the skin cells,
which supply drafting force of the filaments around 20 to 40 percent
of the length. Also they secure its natural color.
A filament of the wool may be
seen under a magnifier lens as a trunk of pine tree with clear
irregular scales and free edges.
This wool could not be used for carpet weaving. In
the meantime, the cellulose of wool-like filaments are not adequate
for carpet because of low quality.
The best wool could be cut out of the shoulder and
belly of the sheep. Therefore, if we want to have a uniform monotonous
carpet, the wool must be cut out of one organ of the sheep for