Improving geometric structure of coloring device in the fiber optics cabling process by numerical analysis of flow characteristics of coloring ink

摘要

In the fiber coloring process, the reduction of the eccentricity between the fiber and the coloring die is important to improve the speed and the quality of colored fiber. The eccentricity is related to the flow field of coloring ink in the die and it is strongly influenced by the geometric structures of the coloring die. A Numerical analysis by which we investigated the coloring ink flow according to the variation of the geometric structures of the coloring die was performed. The relations between the coloring ink flow pattern and the design variables of the die, i.e. the dimension of gap, approach angle, length of land and coloring speed were derived. From the results, a new coloring die which reduces the eccentric input of the fiber was designed and manufactured. Some experiments were performed and they show that the results of numerical analysis are valid. The numerical analysis was performed by FLUENT which is based on finite volume method.