Coating Hollow Fibres: Making Composite NF, RO and Gas Separation Membranes

At a glance. A Tech Inc. Hollow Fibre Coating Line adds a thin selective layer to a porous fibre by dip coating or interfacial polymerisation.

Two methods

• Dip coating: fibre passes through a dilute polymer solution, then dries. Common for PDMS and gas separation.

• Interfacial polymerisation: an aqueous bath, then an organic bath, forms a polyamide layer for NF and RO.

What controls quality

• Steady speed and tension.

• Bath concentration and temperature.

• Drying and curing profile.

Frequently asked questions

Can we coat short lengths first? Yes, with batch bundle coating.

Contact mail@techincresearch.com for a configuration.