The process in brief:
During the air texturizing process, multifilament yarns are conducted through a nozzle where high pressured air mechanically bulks them up. During this process, the filaments remain unbroken, for the most part. When using multiple strands, those are then mechanically bonded and can be processed as a “One-Strand Fiber”.
Reasons for air texturizing:
- Air texturizing increases the yarn density
- allows for hybrid strand making with blended properties
- when woven, it increase the insulation values (reduction of k-values)
- Decorational effect in fabrics for homes or public buildings (wall paper or window sheds)
There are two different kind of air texturizing:
a) Parallel texturizing and
b) Effect texturizing
Parallel Texturized yarns are more comparable to a simple assembly of multiple strands; this version of texturizing is desired to
- increase the insulation values,to
- improve the weave in the final woven cloth,or to
- increase abrasion resistances in the final product,
thus parallel texturizing has a Technical value.
Effect Texturized yarns can be “looped” or “knotted”. The loop effect is achieved by one strand of yarn being fed into the nozzle at a higher speed than the an other strand of yarn.
Those effects are mostly used in decoration applications for woven fabrics, e.g. fiberglass wall papers,
this way, the effect texturizing has an Aesthetic value.
Texturizing can also be applied to multifilaments of different chemical or physical properties, which allows to manufacture hybrid versions. Hybrids can be engineered towards the exact desired mechanical and thermal properties.
Depending on later applications, the market offers
a) without any additional seizing
b) with starch oil seizing
c) with acrylic seizing
These seizings are not be confused with the seizings which are applied to the fibers when extruded from the bushing during the melting process. a) and b) are typically applied during the actually texturizing process.
Some of the advantages for an applied seizing can be
- improved locking of the grade of applied texture
- reduced abrasion during the following intended textile process
However, there can be disadvantages, as the additional seizing can contribute to increased off-gassing when heat is applied. This also translates into a higher LOI (Loss On Ignition).