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Development of dopes for wet and air-gap spinning

An essential step in solution spinning is the development of spinning dopes (polymer solutions) with optimal properties. Precise control over dope properties is essential for ensuring proper extrusion and coagulation, thereby laying the foundation for a well-functioning solution spinning process for man-made fiber production.

Purpose

Spinning dope is a homogeneous solution made from a polymer dissolved in a solvent. The polymer can originate not only from virgin raw materials but also from polymer fractions for example to be extracted during textile recycling. The composition of spinning dope, molecular weight of the polymer, polymer concentration, dope temperature etc. can be tuned to allow polymer dissolution while limiting its degradation and providing reasonable dope properties, such as viscosity and storage stability. Getting right dope properties is crucial for enabling correct extrusion of filaments through spinneret capillaries into the coagulation bath, especially when multifilament spinning is required. There are also great opportunities to add functionality to the wet-spun fibers through targeted dope formulations.

Method

We develop spinning dopes suitable for multifilament solution spinning. Our capabilities include:

  • Equipment for polymer dissolution in different scales, including reactors, kneaders and high-shear mixers.
  • Filtration in various scales.
  • Deaeration.

We characterize dopes using methods such as:

  • Filterability.
  • Rheology.
  • Microscopy.
  • Particle analysis.
  • Polymer dissolution state and solvent-polymer interactions using SAXS/ WAXS.

Delivery

Please contact us for more information for the delivery time and price.

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Development of dopes for wet and air-gap spinning

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Oleksandr Nechyporchuk

Contact person

Oleksandr Nechyporchuk

Forskare

+46 10 228 48 12

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