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3.3
Description of bottom film unwind unit
Depending on the case of application the Repak RE20 can be equipped with different types
of unwinders, all types are situated at the infeed side of the machine.
The unwinding systems can be divided in the following types:
-
WP-400 unwind
-
CK-400 unwind
-
Jumbo unwind
The bottom film roll placed on the bottom unwinder will be unwound via different rollers to
reach finally the chain wheels where the film is pulled into the machine.
At point “A” the chain clips open, they close again at point “B” and clamp the film on both
sides. An infeed roller is positioned between both chain wheels to guide the film properly into
the chain clips.
3.3.1 Film tracking adjustment
Film tracking can be adjusted with the knob at the left side of the tracking frame with weight
plate (WP-400 and CK-400), when turning this one turn clockwise, the film roll will be moved
for 2 mm to the right, if turning one turn counter clockwise, the film roll will be moved for 2
mm to the left.
When a little adjustment is done wait for a few film advances to see what the result is.
TIP:
Only make little adjustments at a time, it take some film advances before the result is
visible.
Figure 3.3 Film in feed
B.
A.
