Coating apparatus – Immersion or work-confined pool type – Work extending through pool-confining wall area
Patent
1984-05-29
1985-06-11
McIntosh, John P.
Coating apparatus
Immersion or work-confined pool type
Work extending through pool-confining wall area
118419, B05C 312
Patent
active
045221480
ABSTRACT:
A coating material is applied to drawn lightguide fiber in a manner which substantially prevents the inclusion of bubbles and which causes the fiber to be disposed substantially concentrically within the coating layer. The lightguide fiber is advanced through a continuum of coating material, which extends from a free surface of a reservoir and through two dies that are arranged in tandem, at a velocity which causes air to be entrained in the coating material. A pressure gradient is established between portions of the first die adjacent to its exit orifice. A first one of the dies communicates with the reservoir and the second die and further communicates at the interface of the dies with a pressurized supply of the coating material. The pressurized flow sufficiently enhances the pressure gradient in the first die and establishes sufficient volumetric flow of coating material upwardly through the first die to cause any bubbles in the coating material on the advancing fiber to be removed by recirculating streamlines and to be moved upwardly into the reservoir. The bubbles are substantially immediately removed from the reservoir by providing fluid exit channels through which bubble entrained coating material exits the reservoir in the vicinity adjacent the first die.
REFERENCES:
patent: 2768911 (1956-10-01), Bunch
patent: 2787980 (1957-04-01), McDermott
patent: 4246299 (1981-01-01), Ohls
patent: 4349587 (1982-09-01), Aloisio, Jr. et al.
patent: 4409263 (1983-10-01), Aloisio, Jr. et al.
Kassahun Bahiru
Viriyayuthakorn Montri
AT&T - Technologies, Inc.
McIntosh John P.
Spivak Joel F.
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