Quick discharging method for tiny bubbles from optical fiber coating

Abstract

The invention discloses a quick discharging method for tiny bubbles from an optical fiber coating, and relates to the field of optical fiber communication. The quick discharging method comprises the following steps of: introducing the coating into a closed coating tank, heating the coating to the temperature of 30-65 DEG C, preserving the heat, vacuumizing the closed coating tank to 1*10<-4>-5,000 Pa, and retaining the vacuum degree; inclining the middle axis of the sealed coating tank by a certain angle relative to a rotating shaft, so that the sealed coating tank does centrifugal motion around the rotating shaft, and coatings are always positioned at the bottom of the sealed coating tank; and increasing the centrifugal rotating speed from 0 rpm until the centrifugal rotating speed is up to 500-22,000 rpm, performing the centrifugal motion for 5-25 minutes at the centrifugal rotating speed, and then reducing the centrifugal rotating speed until the centrifugal rotating speed is 0 rpm, wherein at most one tiny bubble of which the diameter is 0.01-0.15 mm exists in every cubic centimeters, and bubbles of which the diameters are more than 0.15 do not exist. By the quick discharging method, the time for discharging the tiny bubbles during the heat preservation of the optical fiber coating can be reduced, the discharging speed and the exhaust rate of the tiny bubbles can be improved, and the number of bubbles in the optical fiber coating and the defects of the coating layers are reduced.

Description

Technical field [0001] The present invention relates to the field of optical fiber communication, in particular to a method for quickly discharging micro bubbles in optical fiber coating. Background technique [0002] In the production process of quartz optical fiber, it is necessary to coat multiple organic coating layers on the surface of the quartz optical fiber, and then cure the coating on the surface of the optical fiber by ultraviolet curing method to form a multi-molecular protective layer with various properties. Under normal circumstances, a large number of bubbles will be generated during the transportation, filling, and introduction of the optical fiber coating into the coating tank. If the bubbles in the optical fiber coating are not removed, the bubbles will reach the surface of the optical fiber with the feeding system, forming coating defects on the surface of the optical fiber. Large bubbles are easy to be detected by the naked eye, but microbubbles below 1mm ar...

AI Technical Summary

Problems solved by technology

However, if the delivered paint already contains micro-bubbles, the device cannot discharge the micro-bubbles, which also causes defects in the coating layer.

[0006] The Chinese patent application with the application number 201110001201.x discloses an optical fiber paint tank and a filling method for the paint. Through the deflector wall and the floating ball in the paint tank, it prevents the paint from directly impacting the tank body when injecting the paint and causing bubbles in the paint. However, this patent application can only reduce the generation of air bubbles during the paint filling process, and it is still impossible to discharge the tiny air bubbles remaining in paint transportation, filling and other operations.

[0007] In summary, tiny air bubbles are prone to be generated during the process of manufacturing, transportation, filling, filling, conveying and coating of optical fiber coatings. The traditional method of heating the coating takes a long time to remove bubbles, and the effect of removing tiny air bubbles is not good. , the existing solutions can only reduce the generation of air bubbles during the filling and coating process of optical fiber coatings, but cannot discharge the tiny air bubbles in the optical fiber coatings

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