Method of and a device for applying a primary coating to an opti

Details Method of and a device for applying a primary coating to an opti Method of and a device for applying a primary coating to an opti

1986-12-05

1987-12-15

Lindsay, Robert L.

Glass manufacturing

Processes

Forming product or preform from molten glass

65 344, 65 111, 118405, 427163, 4274345, C03B 37023, B05D 506

Patent

active

047131039

ABSTRACT:
A method and a device for applying a primary coating to an optical filament. In order to make the distribution of the coating material even, the flow of the coating material to be introduced into the crucible is divided in the crucible into two flows opposite in direction and advancing in the peripheral direction of the crucible. The two flows are caused to flow in the axial direction substantially at the opposite sides of the crucible. The axial flows are caused to flow in the peripheral direction of the crucible and joined by means of an outer channel extending around the crucible in the peripheral direction thereof. The flow is passed radially through throttle openings into an inner peripheral channel and further through a peripheral throttle slot into a conical channel along which it is led into a central chamber of the crucible, through which chamber the filament is drawn.

REFERENCES:
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patent: 4594088 (1986-06-01), Paek et al.
patent: 4608276 (1986-08-01), Lamb et al.

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