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End-of-pigment fiber melting

End-of-pigment fiber melting

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End-of-pigment fiber melting - BENNIE OPTICAL [PDF]

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Pigments in fibers influence melting behavior, thermal stability, and color retention, and their incorporation must be carefully managed to maintain fiber quality during melt processing.

Pigment Effects on Fiber Melting

When pigments are added to polymer melts for fiber production, they can significantly affect the thermal and rheological properties of the polymer. For example, in melt electrospinning of polylactic acid (PLA), adding colorants increased the melt viscosity by over 100% but reduced electrical resistance, which can influence fiber formation and diameter control . Similarly, in polypropylene (PP) fibers, pigments must be thermally stable at melt temperatures to avoid color degradation, as fibers can degrade before the pigment loses color if stabilizers are not used .

Methods of Incorporating Pigments

  1. Melt Pigmentation (Spun-Dyed Fibers): Pigments are added directly to the polymer melt or pre-melted polymer chips before extrusion. This ensures uniform color throughout the fiber and avoids post-dyeing steps .
  2. Dope-Dyeing: Pigments are dispersed in the polymer solution or melt before fiber formation, as in Lyocell or other man-made cellulosic fibers. This method embeds pigments within the fiber matrix, improving wash fastness and abrasion resistance .
  3. Pigment Concentrates: Pigments are pre-processed into concentrates to prevent agglomeration and ensure smooth incorporation into the polymer melt, which is critical for maintaining fiber quality and consistent color .

Considerations for Fiber Quality

  • Particle Size: Pigment particles must be small enough to pass through spinneret filtration without clogging and to avoid defects in the fiber .
  • Thermal Stability: Only pigments stable at the fiber's melt temperature should be used; otherwise, color fading or degradation occurs .
  • Mechanical Properties: Pigments can slightly reduce elongation but generally maintain tensile strength and tenacity if properly dispersed .
  • Electrical and Flow Properties: In melt electrospinning, pigments can modify conductivity and viscosity, affecting fiber diameter and uniformity .

Practical Implications

End-of-pigment fiber melting is critical in industrial fiber production, especially for thermoplastic polymers like polypropylene and PLA. Proper pigment selection, dispersion, and stabilization ensure that fibers retain color, mechanical integrity, and processability during high-temperature extrusion or spinning. Techniques like melt pigmentation and dope-dyeing are widely used to achieve durable, high-quality colored fibers while minimizing environmental impact compared to post-dyeing processes .

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