Plastic and nonmetallic article shaping or treating: processes – Outside of mold sintering or vitrifying of shaped inorganic... – Including plural heating steps
Patent
1984-02-21
1984-11-06
Childs, Sadie L.
Plastic and nonmetallic article shaping or treating: processes
Outside of mold sintering or vitrifying of shaped inorganic...
Including plural heating steps
264174, 427 541, 427163, 427299, 4274071, 4274072, 428375, 428395, G02B 514
Patent
active
044808984
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, pp. 5.6-1 thru 5.6-4, 9/19/79.
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
Childs Sadie L.
Fox James H.
Pacher Eugen E.
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