A kind of device and method for fiber drawing coating

Abstract

The invention relates to the field of optical fiber manufacturing, in particular to a device and method for drawing and coating optical fibers. The device for drawing and coating optical fiber comprises an inlet mold, a sizing mold and a coating mold which are connected in sequence, the inlet mold, the sizing mold and the coating mold have concentric optical fiber holes, the inlet mold is a double inlet mold, the first inlet mold is spaced from the second inlet mold, the coating mold is provided with an inner coating cavity connected with the second inlet mold and an outer coating cavity connected with the inner coating cavity, each of the mold outlets of the inlet mold, the sizing mold and the coating mold is provided with a slope. The probability of introduction of impurities and volatilization of inner-coating volatile matters to an outer-coating cup can be reduced during inner curing, the curing uniformity of the fiber is increased, the ripples generated on an outer-coating interface after curing of inner-coating volatile matters in optical fiber are avoided and UV light curing space needed after the application of the inner coating is eliminated. The cooling space is increased for drawing optical fibers at a high speed.

Description

technical field [0001] The invention relates to the field of optical fiber manufacturing, in particular to a device and method for drawing and coating an optical fiber. Background technique [0002] Today, the drawing technology for optical fiber production has been developing rapidly, mainly in two aspects: the size of the optical fiber preform is getting larger and the drawing speed is getting faster and faster. In particular, high-speed wire drawing technology has become one of the most direct and effective ways to reduce the cost of optical fiber. [0003] To increase the fiber drawing speed, the fiber needs more cooling space. When the height of the factory building and the drawing tower is fixed, the traditional wet-to-dry coating process occupies a large height space for the system itself, resulting in limited cooling space for the optical fiber, so there is little room for increasing the drawing speed of the optical fiber. For the traditional wet-to-dry coating pro...

AI Technical Summary

Problems solved by technology

If the distribution of the number of curing devices is unbalanced, it will directly affect the uniformity of the curing degree of the inner and outer coating materials.

In addition, due to the attenuation of power during the use of the curing device, the central glass tube is polluted by volatiles of the coating material, etc., the actual optical power of individual or part of the curing device will drop sharply, thus affecting the curing uniformity of the inner and outer coatings.

[0007] (2) The operation process is complicated

Since the first layer of inner coating cup is separated from the second layer of outer coating coating cup, the operation process increases, the mold cleaning process needs to clean two molds, and the wire drawing operation process requires two mold penetrations and two penetrations into the curing system Operation, the whole process is easy to introduce impurities and scratch the optical fiber

[0008] (3) Increased probability of fiber failure

Since the first layer of inner coating cup is separated from the second layer of outer coating coating cup, the outlet of the first layer coating mold will adhere to the volatiles generated during the curing process of the optical fiber, and the uncleanness of the mold outlet increases the contact between the bare optical fiber and foreign matter chance to directly affect the strength of the fiber

In addition, after the first layer is cured, the second layer is coated, which is easy to produce ripples at the interface between the first layer and the second layer, which increases the coating defect rate of the optical fiber.

Images