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Method of sintering optical fiber porous glass base material

A technology of porous glass and base material, which is applied in glass forming, glass manufacturing equipment, manufacturing tools, etc., and can solve the problems of long-term productivity reduction and other problems

Active Publication Date: 2019-10-08
SHIN ETSU CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This process takes a long time and reduces productivity

Method used

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  • Method of sintering optical fiber porous glass base material
  • Method of sintering optical fiber porous glass base material
  • Method of sintering optical fiber porous glass base material

Examples

Experimental program
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Effect test

Embodiment 1

[0050] use figure 1 The sintering apparatus of , manufactures an optical fiber base material by dehydrating and sintering a porous glass base material 11 formed by depositing glass particles on the outer periphery of a starting core base material (target rod) based on the OVD method.

[0051] The multi-stage heater 13 has a three-stage configuration in which the first heater 13A is arranged at the center, the second heater 13B is arranged above the first heater 13A, and the third heater 13C is arranged above the first heater 13A below. The lengths of the first heater, the second heater, and the third heater were set to 400 mm, 490 mm, and 490 mm, respectively. The gap between the first heater 13A and the second heater 13B was set to 645 mm, and the gap between the first heater 13A and the third heater 13C was set to 510 mm.

[0052] Each of the heaters 13A, 13B, and 13C has a thermometer so that their temperatures can be independently controlled based on proportional-integra...

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Abstract

To provide a method of sintering an optical fiber porous glass base material, capable of sufficient dehydration and reducing a transmission loss caused by residual moisture by efficiently transferringheat from the heater to the base material during a process in dehydration / sintering for an optical fiber porous glass base material, a porous glass base material having a heat shield plate installedin a vicinity of a lower end is vertically inserted into a furnace core tube provided with a heater along an outer circumference, and heating using the heater is performed. The heat shield plate has an outer diameter which is 70% or larger than a diameter of the porous glass base material and smaller than an inner diameter of the furnace core tube.

Description

technical field [0001] The present invention relates to a method of sintering a porous glass base material for an optical fiber by dehydrating / sintering the porous glass base material to produce a glass base material. Background technique [0002] As a method for producing a porous glass base material for an optical fiber, vapor axial deposition (VAD) or outside vapor deposition (OVD) is known. In these methods, first, glass raw materials are burned in a flame to generate glass particles by hydrolysis. The resulting glass particles are deposited axially or radially on a rotating target rod to form a porous glass matrix. [0003] Dehydration and sintering of the porous glass base material were performed using a dehydration / sintering apparatus having a furnace tube accommodating the porous glass base material held by support rods and a heater disposed around the periphery of the furnace tube. A gas supply nozzle is provided below the furnace tube, and a gas required for dehy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03B37/01C03B19/06
CPCC03B37/01C03B19/06C03B37/01446C03B37/0146C03B37/01282
Inventor 木野将志富樫拓也乙坂哲也
Owner SHIN ETSU CHEM CO LTD
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