Processes>>Dissolve
Cellulose fibers are produced by converting raw materials into a viscous, homogeneous, degassed spinning dope through a series of steps.
For any fiber requiring a dissolution step, kneader reactor technology can produce high-quality spinning dope—enabling the manufacturing of high-quality fibers with maximum throughput and minimum cost.
The unique process features of kneader reactors provide intensive mixing and kneading, continuous surface renewal, and variable residence time.
Lyocell Fibers
Cellulose and additives are continuously dissolved in a kneader reactor, which provides heat treatment, evaporation, and degassing along with intensive mixing.
The result is a transparent, pale yellow spinning solution that is highly homogeneous, free of bubbles and dissolved gases.
Depending on the process, the solvent may be:
▶N-methylmorpholine N-oxide (NMMNO)
▶Various ionic liquids
▶Acids
▶Caustic alkalis
Aramid Fibers
Aramid fibers are typically wet-spun from a viscous solution of poly(p-phenylene terephthalamide) (PPTA) polymer in concentrated sulfuric acid.
The thermal energy released during the exothermic dissolution process aids in the melting and dissolution of the polymer.
The polymer solution is viscous and non-Newtonian. The requirement is to create a homogeneous, degassed solution with a controllably high polymer concentration.

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