A kind of production method and casing rod for optical fiber drawing

Abstract

The invention discloses a production method of a casing rod for optical fiber drawing and the casing rod. The production method includes the following steps: S1: separately process a tail rod and a target rod, and the diameter of the tail rod is not smaller than the target rod. Rod diameter; S2: weld one end of the tail rod to one end of the target rod; S3: deposit quartz powder on at least part of the surface of the target rod and form a quartz powder layer, and the quartz powder layer at least partially covers the The surface of the tail rod; S4: sintering the quartz powder layer to form a casing; S5: machining off the target rod to obtain a casing rod. The invention completes the welding process of the tail rod and the target rod before carrying out the quartz powder deposition reaction, and the casing does not contain OH ‑ Therefore, qualified optical fibers can be pulled out of the entire sleeve, which reduces material loss and gas consumption, saves resources, improves the utilization of the sleeve, reduces production costs, and avoids the risks of traditional methods.

Description

technical field [0001] The invention relates to the field of optical fiber manufacturing, in particular to a production method and the sleeve rod for optical fiber drawing. Background technique [0002] With the expansion of the optical fiber market, the demand for optical fiber preforms is increasing. The sleeve method is a relatively common method used in the optical fiber production process. At present, the production method of casing method adopted in China is as follows: Figure 1 to Figure 5 As shown, first the tail rod 1 and the target rod 2 are separately processed (see figure 1 shown), and then spray quartz powder on the target rod 2 to complete the deposition process (see figure 2 shown), secondly, the quartz powder is sintered to complete the sintering process to form a quartz powder layer (see image 3 shown), again, the target rod 2 is processed, and the two ends are flattened to obtain the sleeve (see Figure 4 shown), finally, the casing and tail rod 1 a...

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Problems solved by technology

[0003] However, in use, it is found that when the above method is used for production, the production process is relatively complicated, and it is often necessary to weld the tail rod and casing rod together before it can be used for wire drawing production

In the process of welding, due to various reasons, there is a risk of welding failure, breaking accidents, especially Figure 5 The welding time in the medium is long, up to about 4 hours, the gas consumption is large, the welding time cost is high, and the welding efficiency is low; more importantly, because hydrogen and oxygen are used for combustion, the hydroxide ions produced during the combustion process cause Figure 5 The materials in the middle A area are basically scrapped, and qualified optical fibers cannot be pulled out, that is, the materials at the fusion splice cannot be used, resulting in a lot of waste and increasing the production cost; in addition, the success of the fusion splice has a lot to do with the level of the operator

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