Elastic Core & Covering Structure
- Elastic Core Positioning
The spandex core is maintained within the center of the yarn during covering, providing the elastic component of the finished filament yarn.
- Filament Covering
Nylon or Polyester filaments are wrapped around the elastic core to form the outer layer and define the finished yarn surface.
- Covering Configuration
Single or double covering can be used according to the required yarn construction, with the covering arrangement affecting the yarn profile and surface condition.
- Yarn Construction Control
Core denier, covering filament specification, and covering conditions are coordinated to maintain the required yarn diameter and construction.
Stretch Covered Filament Yarn Customization
- Spandex Denier
The elastic core denier can be selected according to the required stretch level, yarn size, and textile construction.
- Covering Material
Nylon or Polyester can be specified according to the required surface characteristics and downstream processing conditions.
- Twist & Color
S or Z twist and customized colors can be produced according to the customer's technical specification or approved sample.
- Package Configuration
Cone weight, winding length, labeling, and packaging format can be adjusted to suit the customer's production and handling requirements.
FAQ
What determines the stretch level of the finished yarn?
The stretch level depends on the elastic core specification, covering tension, yarn construction, and the extension applied during production. Finished-yarn denier alone does not determine stretch.
Does the covering filament restrict the extension of the elastic core?
Yes. The covering layer surrounds the elastic core and affects how freely the core can extend. Covering conditions therefore need to be matched with the required elastic behavior.
How does the elastic core affect yarn diameter during stretching?
As the elastic core extends, its cross-sectional dimensions can change, which may also affect the apparent diameter and surface profile of the covered yarn during tensioning.
Can Stretch Covered Filament Yarn be used in different fabric densities?
Yes, but the yarn specification should be matched with the fabric density and construction. The same yarn can produce different stretch characteristics when used at different knitting or weaving densities.
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