COEXTRUSION DIE AND SYSTEM, METHOD OF MAKING COEXTRUDED ARTICLES AND COEXTRUDED ARTICLES MADE THEREBY

摘要

An extrusion die (20) and method for co-extruding a first molten polymeric material and a second molten polymeric material. The die includes a first die portion (20), a second die portion and a shim separating the first die portion and the second die portion. The shim has a first side and a second side, the first side of the shim forming a boundary of the first die portion and defining a first die cavity (38), the second side of the shim forming a boundary of the second die portion and defining a second die cavity (40). A dispensing edge (36) is provided having a plurality of first and second extrusion openings, a plurality of first feed channels connecting the first die cavity to the first extrusion openings along the dispensing edge, and a plurality of second feed channels connecting the second die cavity to the second extrusion openings along the dispensing edge. The first and second extrusion openings arranged along the dispensing edge to provide an interfacial zone having portions of the first extrusion openings disposed between portions of the second extrusion openings. The die is used in an extrusion system and a method for making a multilayered article.