© MOOG 2010
This document is subject to MOOG INTELLECTUAL AND PROPRIETARY INFORMATION LEGEND . The details are on page II.
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This effect is shown in
Figure 2-3
where the parison position is high relative to the mold.
The wall thickness profile of the parison is the same as in
Figure 2-4
. The alignment lines are in the same
position relative to the mold as in
Figure 2-3
. Here the container wall thickness above both the upper and
lowest alignment lines is too thick, and at the middle alignment line the wall is too thin.
As the parison position is moved down relative to the mold, the wall thickness consistency throughout the
blown container improve until the correct results are obtained. Further parison movement will again result
in poor wall thickness control.
It must be noted that horizontal alignment lines are shown as a tool to demonstrate the requirement for
vertical alignment of the parison and mold. The actual motion of the plastic as it is blown and stretched is
more complicated.
