CONTROLLING CROSS WEB LAYER PROFILE OF A MULTILAYER POLYMER FILM

摘要

A method and an apparatus for forming a plurality of polymer layers via a plurality of slots (60) wherein the plurality of layers are combined to generate a multilayer polymer flow stream; and controlling heat flow to the plurality of slots in conjunction with the formation of the plurality of polymer layers. The multilayer polymer flow stream may be used to generate a multilayer film. In some embodiments the cross web layer thickness profile may be controlled by controlling heat flow from heaters (54a 54b) to the plurality of slots that form the plurality of polymer layers.