Method for producing optical fiber
A manufacturing method and technology of optical fiber, applied in the direction of fiber mechanical structure, device for coating liquid on the surface, special surface, etc., can solve problems such as air bubbles entering, uneven covering layer, etc., and achieve the effect of reducing the possibility
Active Publication Date: 2013-09-04
FURUKAWA ELECTRIC CO LTD
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Problems solved by technology
In the process of forming such a coating, if the pressure of the resin in the coating device fluctuates greatly, the coating may become uneven, and air bubbles may enter the coating, the coating / glass interface, or the interface between coatings. And other issues
Method used
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[0025] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, in the drawings described below, members having the same functions are denoted by the same symbols, and repeated description thereof will be omitted.
[0026] figure 1 It is a schematic configuration diagram of an optical fiber manufacturing apparatus according to an embodiment of the present invention. figure 1 In this method, a heater 2 is provided around the optical fiber base material 1, and the optical fiber base material 1 is heated and melted by the heater 2 and stretched to obtain an optical fiber 3 having a predetermined diameter. A covering device 4 and a curing device 5 are provided at a rear stage of the heater 2 (downstream side in the moving direction of the optical fiber 3 ). The covering device 4 is provided with a resin supply hose 4A for supplying a resin liquid from a resin tank (not shown) to the covering device 4 . A detachab...
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Provided is a method for producing an optical fiber capable of preventing or reducing problems caused when forming a coating layer on a drawn optical fiber, such as entrapment of bubbles in the coating layer or unevenness of the coating layer. The method according to one embodiment of the present invention comprises a step of delivering resin liquid from a resin supply hose (24) connected to a storage tank (23) to coating devices (4, 6) and applying the resin liquid to an optical fiber in the coating devices (4, 6) to form a coating layer. Said method comprises, prior to the step of forming a coating layer, steps (steps S31, S32) of delivering the resin liquid from the resin supply hose (24) to a cup (22) which is separate from the coating devices, and measuring the delivery amount of the resin liquid, and a step (step S33) of determining whether or not the measured delivery amount of the resin liquid is within a permissible range, and if the measured delivery amount of the resin liquid is within a permissible range as a result of the determination, conducts a step (step S34) of forming the coating layer.
Description
technical field [0001] The present invention relates to methods of manufacturing optical fibers. Background technique [0002] In the method of manufacturing an optical fiber, a method of immediately applying a resin solution to an optical fiber to be drawn to form a coating is used. The covering layer is generally formed by supplying resin from a resin tank to a covering device for covering the optical fiber, and coating the optical fiber with a resin solution by passing the optical fiber through the covering device. In the process of forming such a coating, if the pressure of the resin in the coating device fluctuates greatly, the coating may become uneven, and air bubbles may enter the coating, the coating / glass interface, or the interface between coatings. And other issues. [0003] In order to solve this problem, various studies have been conducted to achieve uniform coverage without air bubbles and the like when drawing an optical fiber. [0004] For example, it is ...
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IPC IPC(8): C03C25/10G02B6/44
CPCC03C25/18B05C5/0241B05D5/06
Inventor 宇井启祐
Owner FURUKAWA ELECTRIC CO LTD