| 摘要 |
Interposed in a stack (24) of cellulose graft copolymer plates (26) there are distance plates (28), of which one corrugated side forms a liquid-distribution chamber and whose other corrugated side forms a liquid-collection chamber. A grating (62) prevents the corrugations from becoming blocked as the cellulose graft copolymer swells up. <IMAGE>
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