Winding is the process of transferring yarn or thread from one type of package to another to facilitate subsequent processing. The re- handling of yarn is an integral part of the fibre and textile industries.

Elements of a winding unit

Elements of the winding unit | Texpedi.com

Lower yarn sensor
Gripper arm tube with shutter
Electromagnetic yarn tension sensor
Yarn splicer
Electronic yarn clearer
Yarn Tension Regulator Autotense FX*
Waxing device with wax-roll monitoring*
Yarn trap
Suction tube with upper yarn sensor
Winding unit control system
Propack FX*
Variopack FX*
Operating and display elements
Drum lap guard
Yarn guide drum with Auto Torque Transmission (ATT)
Package cradle with weight compensation *optional extra

Broad category of yarn faults

Neps,
Short thick places,
Long thick places
Double ends / spinner’s doubles and
Thin places

👉Neps – Neps are defects that are extremely short (no larger than few mm) and extremely thick in multiples of normal yarn diameter.

👉Short places – Short places are defects of limited length and of substantial thickness/ cross-sectional increase.

👉Long places, double ends and spinner’s doubles – Long places are defects of substantially longer lengths with marginal increase in yarn diameter/ cross-sectional area. Double ends are caused by two ends being pulled off simultaneously while spinner’s doubles are caused by two rovings spun together. These defects are extremely long.

👉Thin places – Thin places are defects of substantially longer lengths with decrease in yarn diameter/ cross-sectional area.

In setting panel of an electronic yarn clearer, the user has to input values of sets of diameter and length that shapes clearing curve in particular region to selectively eliminate particular category of yarn faults.

What is yarn splicing?
Yarn splicing is a process of overlapping two ends of yarn. Yarn breakage during the yarn winding process is the situation to make the yarn splicing.

Stages of splicing a spun yarn: Spun yarn splicing involves three stage:

First stage consists of removal of twist from some length of yarn ends to be spliced. This operation is called untwisting or opening.

After removing twist, the opened yarn portions are overlapped on each other.

Subsequently, the untwisted overlapped ends are twisted to rejoin the yarn ends.