METHOD AND DEVICE FOR GRANULATION OF POLYMER MELTS CONTAINING BLOWING AGENTS Russian patent published in 2010 - IPC B29C44/34 B29B9/06 B29B9/16 

FIELD: process engineering.

SUBSTANCE: invention relates to method and device for granulation of polymer melts containing blowing agents performed in granulation chamber wherein fluid is circulated at the pressure that exceeds ambient pressure. During the first stage, polymer melt is forced in granulation chamber. Then polymer melt if cut in separate grains by cutting device. Now, fluid carries granulate grains out from granulation chamber to be separated from said fluid. Additionally, proposed method comprises at least one of the following stages: (a) grinding agglomerates or granulate grains if their sizes exceed preset maximum in grinder arranged either behind said granulation chamber or inside said chamber and behind cutting device, fluid pressure relief in special unit and in throttling device. Note here that surge tank is arranged ahead of said throttling device; (d) separating granulate grains from fluid without preliminary pressure relief in fluid containing granulate grains. Note here that throttling device used at stage (c) can represent pressure relief unit throttling device (b). Proposed device comprises various chambers, devices and appliances for above described operations to produce required product.

EFFECT: ruling out pressure and flow oscillations in granulation chamber.

21 cl, 9 dwg