Hollow fiber spinning machine

Facility/equipment: Equipment

    Equipments Details



    The hollow fiber spinline is used to produce hollow fiber membranes via a dry-wet immersion precipitation phase separation process. The fibers are spun by co-extruding a polymer solution and an internal coagulant into a water containing coagulation bath.

    The dry-wet spinning process consists of three stages of diffusion-induced phase separation:
    1. Solvent evaporation or vapor penetration at the outer
    surface of the extruded polymer solution.
    2. Immersion precipitation through the inside; non-solvent
    from the bore liquid diffuses into the polymer solution.
    3. Immersion precipitation via the outer surface when the nascent fibers enters the coagulation bath


    Dry-wet spinning of hollow fiber membranes has a number of advantages:

    • membrane morphology is tailored by an appropriate
    formulation and spin parameters
    • pore structure is formed both from outside and inside • typical diameters: 200 - 5000 micrometer
    • typical production speed: 5 - 50 m/min


    The hollow fibers are applied in:
    • waste water treatment and drinking water production • wine and beer clarification
    • gas separation e.g. O2/N2 and biogas upgrading
    • (bio)medical e.g. hemodialysis, controlled release


    Name Hollow fiber spinning machine
    ManufacturersUniversity of Twente
    NameHollow fiber spinning machine


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