Abstract
Numerical calculation of silica glass deformation in optical fiber drawing from preform has been carried out to reveal the effects of drawing condition on drawing tension and neck-down profile. Effects of drawing condition on drawing tension in optical fiber drawing are important in designing and setting of manufacturing process, because transmission characteristics of fiber is dependent on drawing tension when it is manufactured. Drawing condition is considered to have any effect on neck-down profile in drawing furnace, but it is not well known. This report presents numerical result of drawing tension and neck-down profile. It also shows how the distribution of value in drawing direction changes by drawing condition. The parameters of drawing condition are preform diameter, drawing velocity, heater temperature and its length. The ranges of them are 0.025-0.1m, 10-25m/ s, 2400-2550 K and 0.05-0.2m, respectively.
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