Carbon Black for Fibers and Textiles
Dope-dyed polypropylene and polyester fibers, carpet yarn, technical textiles and nonwovens. Carbon black for fibers must be very fine and very well dispersed; otherwise the yarn breaks.
Fiber production is one of the most demanding applications for carbon black. A polypropylene fiber is on the order of microns thick; at this thickness, an undispersed pigment agglomerate becomes a break point and stops the production line.
Dope dyeing
Mixing the pigment into the polymer at the spinning stage gives a far more durable color than dyeing afterwards: the color is inside the fiber, not on its surface. Lightfastness, wash fastness and rub fastness are markedly higher. The water and energy consumed by the dyeing process are also eliminated.
Applications
- Carpet yarn: UV and wear resistance.
- Automotive textiles: Upholstery and headliners that must not fade after years in the sun.
- Technical textiles and geotextiles: Resistance underground and outdoors.
- Nonwovens: Filter and hygiene products.
- Sacks and bulk bags (FIBC): UV-protected woven PP.
The role of PE wax
In fiber masterbatches, PE wax improves dispersion and reduces filament breaks during spinning. Low-viscosity waxes speed up pigment wetting; in fiber applications, however, the wax level must be kept in check, because excess wax lowers the tensile strength of the fiber.
What to Watch For in This Industry
Pressure filter value (PFV) is decisive for fibers
The dispersion quality of a masterbatch is measured with the PFV test. A low PFV is essential for fiber applications; otherwise the filter on the spinning line clogs.
Finer denier needs finer pigment
As the fiber gets thinner, the maximum acceptable particle size falls. Microfilament applications should use the finest-particle grades.
Recommended Products for This Industry
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Industry-Specific Questions
Which carbon black grade is used for fibers?
In fiber applications, using a high-quality black masterbatch matters more than the grade itself. For masterbatch production, fine-particle grades with a narrow size distribution and low sieve residue are preferred.
Is dope dyeing or piece dyeing more economical?
For high-volume, single-color production, dope dyeing is both more economical and environmentally advantageous: water and energy consumption for dyeing is eliminated. For small multi-color batches, dyeing afterwards keeps flexibility.
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