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Membrane production as developed at Membrana is principally based on two different technologies; the solvent induced phase separation process (SIPS) and thermally induced phase separation (TIPS). In the first case phase separation is induced by a nonsolvent into which the polymer solution is spun, whereas in the second quenching by a cooling bath is responsible for the phase separation of the polymer solution. Both processes lead to the formation of a solvent poor and a solvent rich phase. After removing the latter (p. e. by extraction), pores result which give the membrane its unique features. At Membrana a profound knowledge of the correlation between pore morphology and process parameters exists; thus membrane features can be designed individually for each application covering technical as well as medical fields.
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