52
3.11.4 Roll and shear line cutter
The Roll and Shear line cutter separates the packages completely from each other in the
longitudinal direction. (see Figure 3.27.)
This longitudinal cutting device is mounted on the discharge extension of the machine.
The Roll and Shear line cutter is suitable for any kind of film or combination (such as rigid films,
multilayer aluminum films, paper and flexible films), and works almost fiber free. Film gauges
up to 1000 µm for bottom web are possible.
3.11.4.1
Limitations
The packaging depth is limited at 120mm and perforation cutting is not possible. It is not
suitable for vacuum skin packs.
3.11.4.2
Method of Operation
Two circular knives working in opposite directions which overlap at their circumference are
mounted above and below the film level. They cut the film at their contact points in the manner
of a pair of scissors. (see Figure 3.26 & 3.27)
There is a straight cut between the packages.
In combination with the rigid film puncher, this cutter produces a smooth transition to the
rounded corners.
3.11.4.3
How to exchange the cutting units
Wear chain mess gloves when changing the roller shear knife sets
The method can be described in four steps:
(for strip and line cutting units)
-
Remove the safety covers.
-
Move the outfeed conveyor as far as possible out of the machine extension.
-
Loosen the two bolts as shown below. (figure 3.28)
-
Turn over the cutting unit to the outfeed side of the machine, which allows the unit to
come free of its sockets, now the complete unit can be removed easily. (~20kg unit)
Figure 3.27 one blades for straight cut
Figure 3.28 Roll and Shear exchange unit
By loosening these two bolts, the cutting unit is
easily exchanged for another cutting configuration
Warning
Be aware for sharp knifes!
