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Fig. 5.9: The principle of a membrane dryer | The principle of the membrane dryer is based on the fact that water penetrates a specially coated hollow fibre 20 000 times faster than air.
The membrane dryer consists of a bundle of thousands of coated hollow fibre membranes. These hollow fibres are made of a solid, temperature and pressure-resistant plastic. Their inside surface is coated with an ultra-thin (less than the length of a light wave) coating of a second plastic. The hollow fibres ( membranes ) are installed in a pipe where the inner channel of the fibres is open at the end.
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