The main purpose of winding is to pass the yarn from one type of package to another,
but it also has the function of eliminating the defects that the yarn may present. It is about eliminating
sections of thread with defects such as weak or finer points, more or less large flames, bows of fibers,
tangles of yarn, stretches of twistless yarn, stretches of double yarns, etc., with the same number of knot attachments
or with the Splite system. These "repairs" are accepted in subsequent operations on condition
which are not in considerable numbers and which do not affect the regularity of the fabric.
This verification and selection operation is called clearing.
On each head of the winder there is a special electronic device called clearer,
programmable in its interventions according to the importance of the irregularities that may be
tolerated. The yarn clearer has the purpose of removing the defective part of the yarn and reuniting the two ends of the yarn
with a small knot. Another more advanced knotting system is used when also a
small knot could create problems on the fabric. This system is called Splite and consists of
in overlapping the two ends of the thread in the section where the defect has been removed. The two heads come lightly
sfioccati for about 1/2 centimeters and slightly twisted, creating a slight flame on the yarn
or slub, instead of a knot.