| 摘要 |
A tooth-profile shaped spline convenient to rotary elements of a multi spindle extruder is provided. The spline has a tooth profile which can be provided by deforming a continuous curve as if the x-axis ran on a center circle of predetermined radius. This continuous curve before deformation is a continuous line obtained by connecting a semi-circular or semi-oval line, the line being represented by an expression of x2/a2+y2/b2=1 in a defined area of y>/=0, with another semi-circular or semi-oval line, the another line being represented by the expression of x2/a2+y2/b2=1 in a defined area of y</=0, by turns.
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