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Orientation behavior of crystalline phase in the uniaxial stretching of tubular extruded polyethylene film in the direction prerpendicular to the machine direction is discussed quantitatively in terms of the X-ray pole figure and the degree of biaxial orientation functions.In the stretching the following deformation processes are recognized:(1) The screw axis of lamellar texture shifts to the stretching direction. The order of orientation distribution of b-axis about the screw axis is still kept up at the displacement of the screw axis.(2) The shifting of screw axis is attended by a-, c-axes rotation about b-axis. And the value of biaxial orientation functions _??_ and _??_ is recognized to increase gradually.The crystal c-axis becomes, finally, almost parallel to the stretching axis and a-, and b-axes take optionally rotating orientation in the perpendicular direction to c-axis.

DEFORMATION PROCESSES OF POLYETHYLENE IN THE STRETCHING TO THE DIRECTION PERPENDICULAR OF FILM INTERPRETED IN TERMS OF CRYSTAL ORIENTATION