Patent ID: 8801987

Claim:
A method for coating a substrate comprising: providing a plurality of metered, separate individual streams of a single layer coating material to an extrusion head; expanding each of the plurality of metered, separate individual streams of the single layer coating material in a plurality of corresponding respective expansion regions of a flow joiner; joining the individual streams from the plurality of corresponding respective expansion regions of the flow joiner into a single layer coating flow with uniform thickness at an annular space of the flow joiner each of the plurality of corresponding respective expansion regions having a first end adjacent each of the plurality of corresponding respective receiving regions, each of the plurality of corresponding respective expansion regions having a second end adjacent the annular space, each of the plurality of corresponding respective expansion regions becoming progressively wider from the first end to the second end and remaining wider for extruding the single layer coating flow on to a substrate; and extruding the single layer coating flow on to the substrate.