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US 4,154,592 AGranted
Method of drawing optical filaments
AssigneeCorning Glass Works
InventorAlan C. Bailey
Life of this patent
Estimating the term…
Abstract
A method of forming an article such as an optical waveguide filament by disposing a draw blank in a cylindrical muffle. The muffle is heated to a temperature sufficient to cause a first end of the blank to reach the drawing temperature of the material thereof. A filament is drawn from the first end of the blank while a helium-containing gas flows through the muffle in such a direction that it is exhausted from that end of the muffle from which the filament is being drawn.
Claims9
The method of drawing filaments of thermoplastic material from an elongated draw blank comprising the steps of:
- disposing said blank in a cylindrical muffle,
- heating said muffle to a temperature sufficient to cause a first end of said blank to reach the drawing temperature of the material thereof,
- drawing a filament from said first end of said blank, and
- flowing helium-containing gas through said muffle during at least a portion of said drawing step, said gas containing an amount of helium sufficient to reduce variations in filament diameter.
1 more element
Dependencies are inferred from the claim text.