Patent ID: 6652137
Filing Date: 2003-11-25
Classification: B01F

Abstract:
A double planetary mixer, comprising:a) mixing vessel having an axis; b) at least two stirrers mounted adjacent to one another, each of said stirrers comprising: i) an upper central hub having an axis of rotation offset from said axis of said mixing vessel; ii) a first non-material contacting arm coupled to said hub and extending substantially horizontally therefrom; iii) a second non-material contacting arm coupled to said hub and extending substantially horizontally therefrom; iv) a first stirring element having first and second ends and extending helically relative to said axis of rotation, said first arm coupling said first end of said first stirring element to said hub; and v) a second stirring element having first and second ends and extending helically relative to said axis of rotation, said second arm coupling said first end of said second stirring element to said hub; and wherein said second ends of said stirring elements are disconnected from one another and wherein each of said first and second stirring elements has a constant pitch angle; and c) drive means disposed above said mixing vessel and coupled to said pair of stirrers for rotating said stirrers about said axis of rotation of said upper central hub thereof and about said axis of said mixing vessel.