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The Roccatura, Stribbiatura and Vaporizzo Pag. 9
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Winding, clearing, steaming
Winding, clearing and steaming are treated jointly because they constitute, after
spinning, the last three steps before using the yarn in traditional or knitted weaving.
A regular and accurate execution of these three processes is the prerequisite for a correct one
carrying out the subsequent production processes of weaving, dyeing and finishing.
The winding operation consists in transferring the yarn from one
starting pack on tubes or tubes to another type
of pack called fortress, wrapping the yarn in crossed turns
on a rigid tube with a cylindrical, conical or super-conical shape.
The shape of the packages depends almost exclusively on the machine
which they are intended for: warpers, spoolers, rewinders, looms
rapier or bullet, for knitting, etc. Generally:
• bobbins are used for high-speed machines
cylindrical or conical to facilitate unwinding of the yarn,
without causing the thread to slide along the body of the
fortress.
• for machines with a lower speed, such as machines from
knitwear, super-conical-shaped bobbins are adopted, for
avoid slipping of the yarn on the body of the package in the
unraveling.
For knitting yarns at the same time as winding
a lubrication of the thread is carried out to facilitate its
sliding in the needles of knitting machines. This
procedure is called paraffin waxing.
7.2 The clearing
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.
7.3 The vaporization
The yarns at the end of the spinning come
packed in more or less large spindles
depending on the type of machine for
spin. Because of the twist given at
fibers the yarn stretches, so more or
less noticeable, to tangle though
left slow and without tension.
This trend increases with increasing
of the twists present on the yarn e
therefore, to give stability to the body of the
wire, the steaming operation is used.
The process stabilizes the twisted fibers by the combined action of moisture and heat, and it happens
placing the spindles or tubes coming from the spinning mills in normally metallic baskets or cases,
perforated on the sides that are laid down on a trolley for introduction into a special autoclave of which
the duration of the process and the temperature can be programmed. The thermal process takes place by steam
direct and is performed after a vacuum has been created inside the autoclave by suction
air, in order to obtain a more effective and capillary treatment.
At the end of the operation the baskets are removed from the autoclave and the yarn is ready for the following ones
operations.
Services
After the sale of the machinery we also assist you in logistics and if desired by the customer we have technicians capable of reassembling and starting the machinery.