Patent ID: 6783349
Filing Date: 2004-08-31
Classification: B29C,Y10T

Abstract:
A feedblock for making a multilayer optical film, comprising:(a) a gradient plate comprising at least first and second flow channels, wherein at least one of said flow channels has a cross-sectional area that changes from a first position to a second position along said flow channel; (b) a feeder tube plate having a first plurality of conduits in fluid communication with said first flow channel and a second plurality of conduits in fluid communication with said second flow channel, each conduit feeding its own respective slot die, each conduit having a first end and a second end and, said first end of said conduits being in fluid communication with said flow channels, and said second end of said conduits being in fluid communication with said slot die; and (c) an axial rod heater located proximal to said conduits.