Vad process improvements

Details Vad process improvements Vad process improvements

1993-05-24

1994-10-18

Lindsay, Robert L.

Glass manufacturing

Processes of manufacturing fibers, filaments, or preforms

Process of manufacturing optical fibers, waveguides, or...

65 325, 65 174, 65435, 65427, 42716312, C03B 37023

Patent

active

053564499

ABSTRACT:
In a method for making optical fiber preforms, the time taken for sintering and annealing the clad or jacket layer is significantly reduced by only partially sintering the jacket soot boule in an atmosphere of helium. For example, instead of using one hundred forty-three minutes to sinter completely the soot boule, the boule is only partially sintered by heating in a helium atmosphere for fifty-nine minutes. At this stage of course, the soot boule is still partially porous and is generally opaque. The completion of the sintering and the annealing is then done in a single step in an atmosphere of nitrogen. Surprisingly, we have found that this process does not entrap nitrogen in the soot jacket layer to any noticeable or harmful extent, and the total time for sintering and annealing is significantly reduced.

REFERENCES:
patent: 4032315 (1977-06-01), van der Steen
patent: 4154592 (1979-05-01), Bailey
patent: 4286978 (1981-09-01), Bailey et al.
patent: 4338111 (1982-07-01), Edahiro et al.
patent: 4629485 (1986-12-01), Berkey
patent: 4941905 (1990-06-01), Narasimham
patent: 4978378 (1990-12-01), Ito et al.

Affiliated with

Also associated with

Rating

Vad process improvements does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Vad process improvements, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Vad process improvements will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2369345