Vestil SWA-60-AW - Manual (Page 26)

F:\Manual\SM-1517R-110V-100514 14.05.2010. - 24 -
7 Film Tension Adjust
The pre-stretch unit has a set pre-stretch percentage of 240% (can not be changed) which is
called the First Stage Pre-stretch, therefore there is no pre-stretch setting device on the control panel.
The pre-stretch percentage can be slightly adjusted to a maximum of 320%, which is called the
Second Stage Pre-stretch, and its adjusting method is shown below:
There are 2 sets of nuts and bolts located on the top and bottom of the free roller and is used to
adjust pre-stretch ratio.
Pull away the free roller and 2 springs can be seen attached to the 2 sets of nuts and bolts.
Slightly tighten the nuts onto the bolts to pull on the springs in order to increase pre-stretch ratio.
Warning: Do not pull on free roller while pre-stretch unit in operation, as not to cause film
jamming into rollers.