Patent ID: 6305831
Filing Date: 2001-10-23
Classification: B29B,B29C,D01D

Abstract:
An apparatus for mixing a polymer melt comprisinga mixing chamber having an outer wall,an inner mixing shaft mounted within said mixing chamber so as to define a central axis,a tubular outer mixing shaft mounted coaxially about said inner mixing shaft, with said outer mixing shaft being radially spaced from said inner mixing shaft so as to define an inner mixing chamber therebetween, with said outer mixing shaft being radially spaced from said outer wall so as to define an outer mixing chamber therebetween, and with a free end of said outer mixing shaft being spaced from the outer wall of the mixing chamber so as to define a passageway therebetween which directly interconnects the inner mixing chamber with the outer mixing chamber,a drive for rotatably driving said outer mixing shaft about said central axis,said mixing chamber further having a melt inlet and a melt outlet, with one of said melt inlet and said melt outlet communicating with said inner mixing chamber, and the other of said melt inlet and said melt outlet communicating with said outer mixing chamber.