Main parts of this system are two drums, which are heated with steam by the inside and rotate. As for two drums, a feed-box is made between the drums facing each other and two end-This system has drum ends, and raw liquid is sent here (cf. cross section).
Gap between the drums can be adjusted even during rotation.
Raw liquid supplied in the feed-box is evaporated , scraped with the knives mounted to the upper part of the drums respectively, then collected in one area through conveyer.