Manufacturing method of preform loose body

Abstract

The invention discloses a manufacturing method of a preform loose body. The manufacturing method of the preform loose body comprises the following steps: 1) clamping the two ends of a core rod on twochucks; 2) enabling a spray lamp below the core rod to perform reciprocating motion to obtain a loose body; 3) after the outer diameter of the loose body exceeds a preset critical value, symmetricallyspraying gas to the loose body on the two sides of the lower part of the loose body, wherein the spraying gas of the gas aligns with the axis of the core rod, and the closer to the middle part of theloose body, the higher the spraying speed of the gas is; 4) after the outer diameter of the loose body reaches to a set value, the spraying lamp stops work; and 5) after cooling the loose body, stopping spraying the gas to the loose body. According to the manufacturing method of the invention, the gas is symmetrically sprayed to the loose body on the two sides of the lower part of the loose body,and the spraying direction of the gas aligns with the axis of the core rod, so that the two sides can generate inclined upward forces to the loose body; and through symmetrical arrangement, the finalresultant force is basically vertical upward, so that the integral stress effect of the loose body is good and the bending overhanging phenomenon on the middle part is avoided.

Description

technical field [0001] The invention relates to the field of optical fiber preform rods, in particular to a method for manufacturing loose preform rods. Background technique [0002] In the OVD method, the blowtorch mixes silicon tetrachloride or octamethylcyclotetrasiloxane vaporized gas with oxygen, and sprays it together with hydrogen (or methane) and oxygen flames to the rotating mandrel. Under the action of heat, the raw materials A hydrolysis reaction occurs to generate silica, and the dust particles generated by the pyrolysis of silica particles are adsorbed layer by layer on the rotating mandrel passing through the flame to obtain a loose body, which is then vitrified to obtain a preform. [0003] like figure 1 As shown, when the loose body is manufactured by the existing OVD method, the mandrel bears the greatest force in the middle region of the loose body, and is easy to bend and hang, which will eventually affect the quality of the preform. Contents of the inv...

AI Technical Summary

Problems solved by technology

[0003] like figure 1 As shown, when the loose body is manufactured by the existing OVD method, the mandrel bears the greatest force in the middle area of ​​the loose body, and is easy to bend and hang, which will eventually affect the quality of the preform

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