Multiple coating of fibers

Details Multiple coating of fibers Multiple coating of fibers

B - Operations, Transporting

29

D

18/103, 18/774,

B29D 11/00 (2006.01) B29C 47/06 (2006.01) C03C 25/18 (2006.01)

Patent

CA 1218812

- 10 - MULTIPLE COATING OF FIBERS Abstract This invention relates to an improved method for forming two or more coating layers on a fiber. A first coating liquid is applied by an applicator having a die that provides for the formation of a gap between the die and the first coated layer. A second die is located at the exit of the first die, with the second coating liquid flowing onto the fiber through a relatively narrow clearance between the first and second dies. The clearance is formed by die surfaces perpendicular to the fiber axis. This second die also provides for a gap, so that the second layer is applied at a "free surface" at the point of contact with the first coated layer. This approach eliminates turbulence and coating nonuniformities associated with prior art multiple coating techniques. (Fig. 1)

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