Patent ID: 6601987
Filing Date: 2003-08-05
Classification: B01F,B29B,B29C

Abstract:
An apparatus for premixing additives and feeding them into a polymer melt stream, the apparatus comprising:(a) a conducting element through which the polymer melt stream is conducted; (b) a planetary gear pump with at least n=3 planet wheels; (c) a feed channel and a discharge channel in fluid connection with each planet wheel, wherein at least one and a maximum of nâˆ’1 feed channels are additive feed channels and the remaining channels are polymer melt feed channels; and (d) a feed element, which is in fluid connection with the discharge channels; wherein the conducting element has a first channel and a second channel that opens laterally into the first channel, and wherein the feed element extends into the first channel to form a ring channel, and wherein the openings of the polymer melt feed channels opposite the planetary gear pump are arranged around the feed element.