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Wiredrawing method and wiredrawing device for outer diameter fluctuation optical fiber perform

An optical fiber preform and wire drawing technology, which is applied in the field of optical fiber processing and manufacturing, can solve the problems of uncontrollable outer diameter of bare optical fibers, damage to products and processing equipment, and impact on the performance and strength of optical fibers, so as to save consumption, optical fiber production capacity and processing. Improve efficiency and ensure stable results

Active Publication Date: 2015-02-04
YANGTZE OPTICAL FIBRE & CABLE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, for the preform whose outer diameter fluctuates greatly in the axial direction, the gap between the preform and the glass ring will depend on the change of the outer diameter of the preform itself. If the gap between the larger outer diameter of the preform and the glass ring Within the acceptable range, it will inevitably cause the gap between the small outer diameter of the preform and the glass ring to be too large, which will cause the airflow in the drawing furnace to be disordered, and the outer diameter of the bare optical fiber cannot be controlled. The graphite heating element material in the drawing furnace will be oxidized, which will seriously affect its service life and affect the performance and strength of the optical fiber
Adverse consequences of double damage to products and processing equipment

Method used

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  • Wiredrawing method and wiredrawing device for outer diameter fluctuation optical fiber perform
  • Wiredrawing method and wiredrawing device for outer diameter fluctuation optical fiber perform
  • Wiredrawing method and wiredrawing device for outer diameter fluctuation optical fiber perform

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Effect test

Embodiment 1

[0033] The drawing device used is as figure 1 As shown, it includes a wire drawing furnace body 1. A heating chamber penetrating up and down is arranged in the wire drawing furnace body. An inert gas blowing channel is arranged at the upper end of the heating chamber, and a radial sealing adjustable device is arranged at the upper end of the heating chamber of the wire drawing furnace. The radial seal adjustable device includes a quartz glass base 2 installed at the upper end of the heating chamber, an annular groove is arranged on the upper end surface of the base, and a quartz wool sealing gasket 3 is installed in the annular groove. The quartz wool sealing gasket It is composed of quartz cotton sliver, which is densely filled in the annular groove of the base, and a quartz glass gland 4 is arranged on the upper end of the base. The inner end surface of the quartz glass gland is arranged with a boss and an annular groove.

[0034] The processing objects of this embodiment a...

Embodiment 2

[0039] The drawing device used is as Figure 2-4 As shown, it includes a wire drawing furnace body 1. A heating chamber penetrating up and down is arranged in the wire drawing furnace body. An inert gas blowing channel is arranged at the upper end of the heating chamber, and a radial sealing adjustable device is arranged at the upper end of the heating chamber of the wire drawing furnace. The radial seal adjustable device includes a metal base 13, a boron nitride telescopic closed ring 16 and a quartz glass sleeve 17, the metal base is fixed on the furnace mouth at the upper end of the heating chamber, the lower end of the metal base is provided with an annular cooling water tank 14, and the upper end of the base is A ring-shaped cavity is set, a boron nitride telescopic closed ring is installed in the ring-shaped cavity, and a quartz glass sleeve is installed on the upper end of the ring-shaped cavity, thereby forming a ring-shaped cavity with an inner opening. The ring-shaped c...

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Abstract

A wiredrawing method and apparatus for an outer diameter fluctuation optical fiber preform, in particular, a large-size outer diameter fluctuation optical fiber preform. A radial sealing adjustable apparatus is disposed at a furnace mouth at an upper end of a heating cavity of a wiredrawing furnace; and in a wiredrawing process, an optical fiber preform is close attached to the radial sealing adjustable apparatus, so that the difference between an outer diameter of the optical fiber preform and a sealing aperture of the radial sealing adjustable apparatus is kept in the range of 0 to 0.2mm. Therefore, the radial gap between the large-size preform with nonuniform outer diameter variation and the radial sealing adjustable apparatus is always kept in a small allowable gap range or tends to zero in a wiredrawing feeding process, so that the wiredrawing quality is ensured.

Description

technical field [0001] The invention relates to a wire-drawing method and a supporting device for an optical fiber preform with fluctuations in outer diameter, especially large-scale fluctuations in outer diameter, and belongs to the technical field of optical fiber processing and manufacturing. Background technique [0002] With the development of the optical fiber preform manufacturing process, the size of the optical fiber preform is getting larger and larger. At present, the drawing length of a single optical fiber preform can reach 3500~4200km, or even 8000km, which is very effective for increasing optical fiber production capacity and reducing optical fiber manufacturing costs. However, for some large-sized preforms, such as porous glass optical fiber preforms manufactured by external vapor deposition (OVD), after dehydroxylation heat treatment, they will become transparent with relatively large fluctuations in the outer diameter along the axial direction. Preform. U...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03B37/025C03B37/03
CPCC03B37/029C03B2205/92C03B37/02736C03B2205/80Y02P40/57
Inventor 张振众龙胜亚邱文斌张文俊李国巍黎绍平王瑞春
Owner YANGTZE OPTICAL FIBRE & CABLE CO LTD