Membranes

Membrane filtration is a method used in gas and liquid processing that result in the need for a composite structure through which the gases or liquids can be transported and separated.

With this technique one can selectively restrict the separated particle size. Particle sizes of 0.5-0.1 microns are called micro filtration, particle sizes of 0.1-0.01 micron ultrafiltration and particle sizes of 0.01-0.001 micron ie 10-1 nm nanofiltration.

The separation of particle sizes of 1 to 0.1 nm is referred to as reverse osmosis. In this case there is no separation of undissolved particles since the dimension of the molecules is achieved, and only loose particles are held back.

The applications for membranes is very versatile. Coatema equipment is often used for the production of membranes in the field of reverse osmosis.

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One of the core businesses of Coatema is technical developments for gas filtration and fuel cell membranes. This includes the casting of membranes to support films and the capillary coating of metal foams.

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The crucial need for purification of drinking water is rising as populations increase. Here reverse osmosis is often the best solution. The filter membranes required for this can only be efficiently produced in roll to roll processes due to the high volume requirement at reasonable production rates and cost.

Coatema provides the complex production plants, which provide the conditioning of surface structures or pores by dipping baths and the casting of polymer solutions with slot dies on surfaces.

In these plants, usually multi-layered composites with the required accuracy of the structures are produced in several process steps.

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areas of application

  • Reverse Osmosis
  • Water purification
  • Waste water filtration
  • Gas Filtration
  • Nanofiltration
  • Fuel cells