Further Studies on Solid-State Extrusion of Linear Polyethylene and Binary Systems of Linear Polyethylene and N-Paraffin

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Abstract
The extrusion characteristics of the binary system of high density polyethylene and H-paraffin in the temperature region from the room temperature up to 80°C was investigated in connection with the previously proposed equation of extrusion pressure. The agreement between the extrusion characteristics observed and estimated was quite good, and the applicability of the equation was confirmed in wider range of extrusion conditions. The extrusion pressure decreases with increasing quantity of blended n-paraffin. This fact was explained as due to the lubricating effect of n-paraffin as well as the decrease of yield stress. The super structure of the material was examined and the existence of voids between the fibrillar structure of the extrudate was estimated. The existence of the voids were most remarkable in the extrudates obtained at lower extrusion temperatures. The extrudates of blended materials showed opaque appearance.

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