Abstract
The orientation of Crystalline phase in a tubular extruded polyethylene film during constant width-stretching was studied quantitatively by means of X-ray pole figure technique and biaxial orientation functions.The experimental results shows that, in the lamellar texture, the b-axis lies prependicular to the screw axis and takes a circular arc-distribution, centering around the screw axis, in the initial stage of a deformation process owing to constant width-stretching. It then becomes, on the average, elliptic-distribution, whose major axis is lying in the transverse direction. The b-axis further orients gradually from the elliptic-distribution to a preferred orientation parallel to the transverse direction as the deformation increases. It is recongnized along with this that the c-axis orientation in the stretching direction proceeds through the (100)[001] plastic slipping and a rotation of the (100) slip-plane around the b-axis.
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