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Glass preform drawing apparatus

A technology of stretching device and preform, which is applied in glass forming, glass reshaping, glass production, etc., to achieve the effect of device simplification

Active Publication Date: 2014-09-24
SHIN ETSU CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the outer diameter of the drawn glass rod may be larger than the predetermined value

Method used

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  • Glass preform drawing apparatus
  • Glass preform drawing apparatus

Examples

Experimental program
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Effect test

Embodiment 1

[0037] use figure 1In the shown device, the glass preform 1 for the optical fiber preform is stretched to a target outer diameter d=120mm. The glass preform 1 includes an effective portion having an average outer diameter of 170.5 mm, a length of 1000 mm, and tapered portions of approximately 300 mm at both ends of the effective portion. The material of the top chamber 8 is quartz glass. In the stretching step, the inside of the heating furnace 2 was kept under a nitrogen atmosphere at a temperature of 2300K.

[0038] Determine the stretching conditions according to the following formula:

[0039] V 2 =V 1 ×(D / d) 2

[0040] Among them, V 1 is the feeding speed of the glass preform (V 1 =10mm / min); V 2 is the extraction speed of the glass rod; D is the outer diameter of the stretched part of the glass preform.

[0041] In the glass rod obtained by stretching the effective portion of the glass preform, the maximum outer diameter near the end of stretching was 120.8mm,...

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Abstract

The present invention provides a glass preform drawing apparatus capable of feeding a glass preform into a heating furnace at a predetermined feed speed and producing a glass rod having a uniform diameter. Specifically, the present invention provides a glass preform stretching device for producing a glass rod with a desired outer diameter by heating and stretching a glass preform, wherein, at the normal operating temperature T (K ), the top chamber is transparent at a wavelength λ (μm) represented by the following formula: λ=2898 / T.

Description

technical field [0001] The present invention relates to a glass preform drawing apparatus for producing glass preforms such as optical fiber preform ingots in a heating furnace and then drawing the heated preforms to a desired outer outside diameter of the glass rod. Background technique [0002] In an apparatus for producing a glass rod having a desired outer diameter by heating and stretching a glass preform typified by an optical fiber preform ingot or the like, according to Japanese Patent Application Publication Nos. 11-147731, 11-060259, 06- 256034 and 11-209137, some devices include a glass preform container called a top chamber in the upper part of the device. [0003] figure 2 is a schematic diagram of a glass preform stretching apparatus including a top chamber. [0004] The glass preform 101 is heated by a heater 103 provided inside the heating furnace 102 . While the glass preform 101 is fed into the heating furnace through the feeding mechanism 104, the glas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03B37/025
CPCC03B23/043C03B37/0124Y02P40/57
Inventor 乙坂哲也
Owner SHIN ETSU CHEM CO LTD
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