METHOD AND DEVICE FOR PRODUCTION OF POLYMER GRANULATE Russian patent published in 2012 - IPC B29C44/34 C08J9/16 

FIELD: process engineering.

SUBSTANCE: proposed method comprises the following steps. Making polymer melt 2 to be cooled by first static cooler 9, adding at least one additive 25 to cooled polymer melt 2, admixing at least one additive 25 to said melt by screw extruder 13, adding at least one foaming agent 31 to said melt to mix is with melt by said extruder 13. It comprises also second cooling of melt 2 by second static cooler 37, and pelletising cooled melt 2. Proposed device comprises first and second static coolers 9, 37 for mixing additives 25 and foaming agents 31. Note here that first cooler 9 is arranged ahead of screw extruder 13 while second cooler is arranged behind said extruder.

EFFECT: simple process, higher efficiency.