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Sintering apparatus and sintering method for glass preform for optical fiber

一种烧结设备、预制体的技术，应用在玻璃制造设备、玻璃生产、制造工具等方向，能够解决气密性下降、树脂密封构件热变形等问题，达到抑制特性的劣化的效果

Inactive Publication Date: 2015-09-30
SHIN ETSU CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, during the heat treatment of the preform, the vicinity of the flange of the upper opening portion is always exposed to high temperature, and the resin sealing member is thermally deformed by repeated heat treatment for a long time, causing a decrease in airtightness.

Method used

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  • Sintering apparatus and sintering method for glass preform for optical fiber
  • Sintering apparatus and sintering method for glass preform for optical fiber
  • Sintering apparatus and sintering method for glass preform for optical fiber

Examples

Experimental program
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Effect test

Embodiment 1

[0028] figure 1 It is a schematic diagram showing the sealing state between the opening of the core tube and the upper cover in the present invention. Reference numeral 1 denotes a flange of the upper opening portion of the core pipe; reference numeral 2 denotes an upper cover; and reference numeral 3 denotes a sealing member. The sealing member 3 is stored in a groove formed in the upper cover 2 .

[0029] The core tube has an inner diameter of 380 mm and an outer diameter of 390 mm, and is made of clear quartz glass. A flange 1 made of transparent quartz glass and having a thickness of 10 mm and a width of 25 mm was provided on the opening portion. The upper cover 2 is made of transparent quartz glass, and has a diameter of 430 mm and a thickness of 15 mm. The bar that suspends prefabricated body runs through the center of loam cake 2. The rods are connected to preform lifting equipment.

[0030] The sealing member 3 is a black O-ring made of fluoride rubber, and has a...

Embodiment 2

[0035] by using figure 2 Sintering equipment, under the same conditions as in Example 1, the porous glass preform was sintered. figure 2 The shown sintering apparatus is an example in which the flange portion of the core tube in the sintering apparatus of the present invention is made of opaque quartz. The heat rays emitted by the heating furnace and transmitted upward through the core tube are dispersed on the flange portion and radiated to the outside, which can effectively reduce the temperature increase of the upper cover and the sealing member, and can maintain the temperature of the upper cover and the sealing member at Below 110°C.

Embodiment 3

[0037] by using image 3 Sintering equipment, under the same conditions as in Example 1, the porous glass preform was sintered. image 3 The shown sintering apparatus is provided with a heat radiation mechanism provided below the opening portion of the core tube. The outer wall between the upper flange of the core tube and the zone heated by the furnace is blackened as a heat radiation mechanism. Heat rays emitted from the heating furnace and transmitted upward through the core tube are gradually absorbed by the coating while being transmitted through the quartz glass member of the core tube, and the absorbed heat is radiated from the coating to the outside. Therefore, heat rays reaching the upper flange portion can be reduced, and the temperature of the upper cover and the sealing member can be kept below 110°C.

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Abstract

A sintering apparatus heat-treats a porous glass preform for an optical fiber at a high temperature. The sintering apparatus includes: a glass preform elevating / lowering mechanism; a furnace core tube having an upper part having an opening part into which the glass preform is inserted by the elevating / lowering mechanism, and made of quartz glass; a heating furnace disposed on an outer circumference of the furnace core tube; an upper lid for closing the opening part of the furnace core tube; and a sealing member holding mechanism included in the upper lid and configured to hold a sealing member interposed between the opening part and the upper lid.

Description

technical field [0001] The present invention relates to the sintering of glass preforms for optical fibers. The present invention relates to a sintering device and a sintering method for a porous glass preform for an optical fiber which prevents gas contained in a core tube from leaking into a chamber and air from entering the core tube. Background technique [0002] As a method of manufacturing a glass preform for an optical fiber, there are methods called a VAD method and an OVD method. In these methods, first, glass raw materials are burned in a flame to produce glass fine particles. Glass fine particles are attached to a target rod to be rotated in an axial direction or a diameter direction to manufacture a porous glass preform. The porous glass preform thus produced is heated to 1400° C. to 1600° C. in an apparatus called a sintering furnace to produce a transparent glass preform. Before the porous glass preform is vitrified into transparent glass, dehydration treatm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03B37/018
CPCC03B37/0146Y02P40/57
Inventor 内田一也
Owner SHIN ETSU CHEM CO LTD
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