電線被覆用ダイヘッド内における樹脂流動に関する数値解析
1977 年 5 巻 2 号 p. 60-67
詳細
1977 年 5 巻 2 号 p. 60-67
Numerical analyses of viscous flow in a wire coating die were made for non-Newtonian power-law fluids. The die was divided into three parts with different taper angles along the die axis, and a running wire was located on the axis.
The flow within each volume element was assumed to be the simple shear flow between parallel plates, but the boundary conditions for the total system were set as to fit for the actual geometry of the die. The velocity and stress distributions in the fluid and the tension exerted on the running wire were evaluated with varying combinations of the die geometry and the running speed of the wire. It was found that the shortening of the land length and the lowering of the reduction ratio were essential to realize the high speed coating. The results were supported by some model experiments for a high-molecular-weight high-density polyethylene.
