Controlling cross-web layer profile of a multilayer polymer film

摘要

A method is disclosed that includes forming a plurality of polymer layers via a plurality of slots, 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 to the plurality of slots that form the plurality of polymer layers.

主权项

1. A method comprising:
forming a plurality of polymer layers via a plurality of slots, wherein each slot of the plurality of slots includes a first end, a second end, and an elongated opening extending from the first end and the second end in a cross-web direction; controlling heat flow to an edge of at least one of the first end or the second end of each slot of the plurality of the slots in conjunction with the formation of the plurality of polymer layers; and combining the plurality of polymer layers to generate a multilayer polymer flow stream, wherein the heat flow to the edge of the at least one of the first end or the second end controls a cross-web layer thickness profile of a multilayer polymer film generated from the multilayer polymer flow stream; wherein controlling the heat flow to the edge of the at least one of the first end or the second end of each slot of the plurality of the slots comprises controlling the heat flow to the first end of each slot, wherein the heat flow is controlled via at least one heater located adjacent the first end of each slot, and wherein the first end is between the at least one heater and the elongated opening of each slot.