Optical fiber cooling device and optical fiber manufacturing method
A technology for cooling devices and optical fibers, which is applied in manufacturing tools, glass manufacturing equipment, etc., and can solve problems such as inability to apply resin immediately and high temperature of optical fibers
Active Publication Date: 2017-08-01
SUMITOMO ELECTRIC IND LTD
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Problems solved by technology
An optical fiber drawn from a glass base material is coated with a UV-curable resin and cured to form a coating, but the resin cannot be coated immediately because the temperature of the optical fiber immediately after drawing is high.
Method used
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[0020] Next, specific examples of an optical fiber cooling device according to an embodiment of the present invention and an optical fiber manufacturing method using the cooling device will be described with reference to the drawings. In addition, this invention is not limited to these illustrations, It is shown by a claim, The content equivalent to a claim, and all the changes within the range are included.
[0021] In the optical fiber cooling device, when the distance from the upper end of the cooling pipe part to the supply position of the cooling gas is short, it is difficult for the air drawn to the periphery of the optical fiber to diffuse from the periphery of the optical fiber, and it is difficult for the cooling gas to diffuse to the end of the optical fiber. around. Therefore, there is a problem that it is difficult to lower the temperature of the optical fiber without reducing the volume fraction of air around the optical fiber (also referred to as the volume conce...
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The invention provides an optical fiber cooling apparatus and an optical fiber manufacturing method which can determine optimal supply position of a cooling gas. The supply position of the cooling gas, upon setting a downward gas stream of an inner gas which includes air which is induced from an upper end (22) of a cooling pipe portion (21) and the cooling gas as positive, sets a downward flow amount in the surrounding of an optical fiber as Q1, sets an upward flow amount in the surrounding of the downward flow amount Q1 as Q2, sets a volume fraction of air which is included in the downward flow amount Q1 at a distance L position from the upper end to an injection slot of the cooling gas as C1(L), and sets L as in the vicinity of Lideal when setting an L which makes formula 13 the smallest as Lideal. The distance between the upper end and the supply position of the cooling gas is set as L. At the border between the downward gas stream and the upward gas stream, the distance between a position whereby a flow velocity is set as zero and a central axis of the cooling pipe portion is set as Rreverse. A diffusion coefficient of the air is set as D. A diffusion distance of the air is set as length.
Description
technical field [0001] The invention relates to an optical fiber cooling device and an optical fiber manufacturing method which use gas to cool an optical fiber drawn from an optical fiber glass parent material. Background technique [0002] An optical fiber is manufactured by heating and softening an optical fiber glass base material (hereinafter referred to as a glass base material) in an optical fiber drawing furnace (hereinafter referred to as a drawing furnace) and drawing it from below the drawing furnace. out (drawing). An optical fiber drawn from a glass base material is coated with, for example, an ultraviolet curable resin and cured to form a coating. However, the resin cannot be immediately coated because the temperature of the optical fiber immediately after drawing is high. Therefore, an optical fiber cooling device is installed between the drawing furnace and the resin coating device to cool the freshly drawn optical fiber. [0003] Regarding this optical fib...
Claims
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IPC IPC(8): C03B37/02
Inventor 上之山宪博盐崎学冈崎岩长谷川慎治越水成树
Owner SUMITOMO ELECTRIC IND LTD