Coating processes – Electrical product produced – Welding electrode
Patent
1982-12-29
1984-10-02
Hoffman, James R.
Coating processes
Electrical product produced
Welding electrode
427163, 427299, 4274071, 4274072, B05D 720, B05D 306, G02B 514, G02B 516
Patent
active
044748302
ABSTRACT:
Fibers are coated with two (or more) layers. 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.
REFERENCES:
patent: 3947173 (1976-03-01), Dougherty
patent: 4264649 (1981-04-01), Claypoole et al.
patent: 4374161 (1983-02-01), Geyling et al.
patent: 4409263 (1983-10-01), Aloisio et al.
Sato et al., "Double Layer Silicone Coating with Double Cone Nozzle in-line with Optical Fiber Drawing" Optical Communication Conference, Amsterdam, Sep. 17-19, 1979, pp. 5.6-1 thru 5.6-4.
Chida et al., "High Speed Coating of Optical Fibers with Thermally Curable Silicone Resin Using a Pressurized Die" Electronics Letters, vol. 18, 1982, pp. 713-715.
AT&T Bell Laboratories
Fox James H.
Hoffman James R.
Pacher Eugen E.
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