PURPOSE: To obtain a product having desired particle size distribution, flowability, and bulk density from a cellulose ether having a finely fibrous or wad-like or woolly structure.
CONSTITUTION: A process for screening a cellulose ether having a finely fibrous or wad-like or woolly structure is provided, which comprises (a) applying the cellulose ether (material to be screened) to a sieve surface, (b) dividing the material to be screened into an screenable portion (acceptable size material or material passing through the sieve) and a circulating portion (oversize material or sieve surface tailings) with the aid of an agitated (pref. vibrating and/or tumbling) sieve surface, (c) flushing through the agitated sieve surface from below, perpendiculary to the sieve surface, with an air flow, (d) discharging (recovering) the screenable portion, and (e) discharging the circulating portion from the sieving system.
GIYUNTAA UERUTO
MANFUREETO TSUIIGERUMAIYAA
