Method for drawing major-diameter optical fiber preform by continuous smelting furnace

Abstract

The invention discloses a method for drawing a major-diameter optical fiber preform by a continuous smelting furnace. The method comprises the steps that high-purity quartz sand is prepared firstly; raw silica is subjected to water washing, crushing, pickling, roasting, water quenching, drying, smashing, iron removal, sorting and floatation sequentially; the quartz sand is put into a reaction kettle; mixed acid is added, and reacts for over 24h while rotation is performed; the high-purity quartz sand in the reaction kettle is taken out and dried for standby application; a core bar in the continuous smelting furnace is dismounted; a forming device is arranged below a material platform outlet at the bottom of a tungsten crucible, wherein the forming device comprises a stand pipe butted with the material platform outlet; a horn-mouth-shaped opening protector is arranged at the lower end of the stand pipe; a smooth necking section is arranged at the bottom of a material platform, and butted with an upper port of the stand pipe; a computer system and a laser diameter measurement system are combined for control; and the satisfactory major-diameter optical fiber preform is drawn. According to the method, a finished product rate of the major-diameter high-purity optical fiber preform is greater than or equal to 90%, a hydroxyl value is less than or equal to 1ppm, and the content of SiO2 reaches 99.9999%.

Description

technical field [0001] The invention relates to a quartz product, in particular to a method for drawing a large-diameter optical fiber preform with a melting furnace. Background technique [0002] Optical fiber quartz preform has the characteristics of higher purity, high tensile strength, and high optical stability. It has a large market demand and is suitable for military, civil, aviation and other communication (communication) fields. At present, there are only general diameters of a few millimeters to tens of millimeters (called light rods) on the market. The commonly used manufacturing processes are external vapor deposition method OVD, vapor phase axial deposition method VAD, improved vapor deposition method MCVD and plasma chemical vapor deposition process PVCD. and other mixing processes. At present, there are more than 200 domestic optical cable manufacturers, most of whom rely on imported optical cables or optical fiber preforms to produce optical fiber products....

AI Technical Summary

Problems solved by technology

At present, there are more than 200 domestic optical cable manufacturers, most of whom rely on imported optical cables or optical fiber preforms to produce optical fiber products. In 2013, the domestic demand is expected to be about 2,500 tons, and the domestically produced preforms are about 1,250 tons. , the remaining 50% needs to be imported from abroad, the cost is high, resulting in the situation that making rods is not as good as buying rods

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