ANNULAR FEEDBLOCK FOR COEXTRUDED FILM, AND METHODS

摘要

A feedblock (12) for a film extruder used to produce a uniform, multiple layer web (19). The feedblock has a generally annular configuration, for receipt of a core material (15) and a skin material (17). The feedblock has a varying radial dimension for passage of the skin material therethrough. After feeding the core material and the skin material through the feedblock and then a die (14), a flat web (19) having at least three layers, uniform across the web width, is obtained.