METHOD AND APPARATUS FOR THE PRODUCTION OF IMPROVED FILMS OF PLASTICS MATERIAL AND CELLULOSIC STOCK

摘要

A method is described for effectively preventing the formation of hollows and bosses in wound viscose and cellulosic films formed from the extrusion of thread-like viscose or cellulosic elements. Such method involves the use of a mobile body located within the extruder hopper feed conduit and sweeping continuously around the inside periphery of this conduit. The result of such sweeping motion is to randomize the irregularities inherent in these extruded films and thereby eliminate superposition of repeating film characteristics giving, on winding, an extruded film of uniform average thickness.