Following the foregoing work, extrusions in the cone were studied for highly filled suspension (HSF) of kaolin-water system including additive. By the visualization, the slip line was observed within the HFS, instead of wall slip reported in the previous paper. In the cone, the only one slip line was observed with a fixed boundary condition. Therefore, the direct analysis for slip can be applied different from the usual slip line analysis. The ordinary differential equations for slip angle, 7),

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... and mean principal stress, am, were solved directly with the boundary condition as function of radius, r. Observed slip lines agreed well with the theory. The extrusive pressure calculated by integrating the stress component of the extruding direction along the slip line also agreed well with the corresponding piston load. Thus, the present method was useful.