METHOD OF EXTRUDING ARTICLES.

摘要

The present invention method is directed at coextruding a predetermined initial melt stream through at least one profiled die insert, which die insert inlet is shaped to form a nonlinear melt stream from the incoming initial melt stream. The die insert inlet has a nonlinear opening where the die insert opening structure is located between an upper boundary to a lower boundary. The die insert is positioned so as to redirect the flow of one or more of the melt streams or regions of the incoming melt stream. The initial melt stream at the die insert inlet is generally redirected in the cross direction to the original flowpath of the material melt stream. The nonlinear melt stream formed at the die insert inlet then converges within the die insert into a substantially more linear or rectangular melt flow stream at the die insert outlet opening. At the die insert outlet opening at least one layer or portion of the initial melt stream has been partitioned, into different proportions in different zones in the width or cross direction of the extruded material or film. The invention is also directed at articles extruded using the methods described.