Regular division of melt flow in extrusion of blown films

Details Regular division of melt flow in extrusion of blown films Regular division of melt flow in extrusion of blown films

B - Operations, Transporting

29

C

B29C 47/06 (2006.01) B29C 47/20 (2006.01) B29C 47/28 (2006.01) B29C 47/70 (2006.01) B29C 55/28 (2006.01)

Patent

CA 2526196

An extrusion die in which material is extruded at an annular orifice in a direction generally parallel to a central axis of the die. A plurality of die layers are stacked one upon the other in a direction along the central axis, each of the die layers including: channels for dividing an input of material into first and second flows of the material which are provided along first and second axially spaced and axially facing surfaces away from each other, the first and second flows being brought together to be provided to the orifice, the first flow having 2 n passages with 2 n outputs along the first axial surface at equally spaced circumferential locations; and the second flow having 2 n passages with 2 n outputs along the second axial surface at equally spaced circumferential locations and offset from the passages and outputs from the first flow.

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