| Welcome to the fast moving and still noisy world of yarn texturing. These pages will explain to you the principles on how textured yarn is produced. Textured yarn is known in the industry also as DTY, which stands for Draw Textured Yarn. It is today produced at approximately 1000 m/min production speed. Only synthetic filament yarns can be false twist textured because of their thermoplastic properties. |
Why do we texture yarns?
To give synthetic yarns special properties such
as stretch,
bulk and the appearance of natural fibers.
The false twist texturing principle
For the texturing process the texturing industry
has the choice of a variety of DTY machines produced by various
manufactures
around the world. False twist texturing machines, regardless who
offers
them, all work on the same principle. The schematic below shows
the
most important steps in the manufacturing of DTY.
POY, which stands for Partially Oriented Yarn, is now the standard feed yarn for the texturing process. It is a continuous filament yarn spun at a speed, which is, for example for polyester, around 3200 m/min.
Shaft 1 is the input feeding device for the POY. From here the yarn is fed to Shaft 2. When POY is fed into the machine, the yarn has to be drawn. The speed of shaft 2 is always higher by the factor of the necessary draw ratio for the particular yarn and process. The yarn is simultaneously twisted and drawn. The twisting is done with a friction device, such as a set of rotating friction disks. But there are other twisting devices such as belts. After Shaft 1 there is a yarn heater, which heats the yarn to a temperature where it can be thermo-set. Right after the heater is normally a cooling plate, which must cool the yarn to a substantially lower temperature in order to permanently thermo-set the twist. As the yarn is released from Shaft 2 we observe how each single filament is trying to assume the three dimensional helix formation it was set in. The result is a voluminous bulked stretch yarn.
What type of yarns can be textured?
Synthetic filament yarns made from polyester,
nylon and polypropylene. Polyester yarns are normally in the
range between 50 and 300 den, with the emphasis on 75 and 150
den. Nylon yarns are in the range from 15-110 den, with the
majority of fine hosiery yarns being 20 den and coarser yarns being 70
den.
Are there other types of false twisted yarns?
Yes, check out my set yarn
page .
What is sequential texturing?
Check out my sequential
texturing page .
What is tangled DTY yarn?
Check out my interlace
page .
What is Zero Twist and Detorque yarn?
Check out my TORQUE,
DETORQUE-, ZERO TWIST-, LOW TORQUE- YARNS .
Have you anything on texturing of micro fibers?
Yes, check out my micro
fiber page .
How does false twisting really work?
Check out my special page on false twisting: false-twist page .
How do friction disks really work?
Check out my special page disks: disks page .
How are fancy yarns being produced?
Check out my very special pages: fancy yarn
What is ATY yarn?
For more details go to my ATY,
Air Textured Yarn pages .
NEW:
A method for quickly finding optimum texturing machine settings for a
DTY yarn.
See details log into this website: Modeling and
Optimization <>
FIBRES & TEXTILES in Eastern
Europe 2009, Vol. 17, No. 6 (77) pp. 57-62.
Published on issue no 6 (77) / 2009, pages 57–62.
Interested to buy new or used friction texturing
machines?
I
can help.
I hope that my explanation
has helped
you
to understand the principle of the texturing process. There is
much
more knowledge out there, but unfortunately very little on the
web.
I will try to remedy this situation and welcome all suggestions.
Please
let me have your comments.
Last
updated March 13, 2010
© Copyright Udo
P.
Schweizer