Vertical packaging machines use a single sheet of film material rolled around a core, usually referred to as rollstock. The continuous length of packaging material is referred to as the film web. This material can vary from polyethylene, cellophane laminates, foil laminates and paper laminates. The roll of film is placed on a spindle assembly at the rear of the machine.
When the VFFS packaging machine is operating, the film is usually pulled off the roll by film transport belts, which are positioned to the side of the forming tube which is located at the front of the machine.
From here, the film enters a forming tube assembly. As it crests the shoulder (collar) on the forming tube, it is folded around the tube so that the end result is a length of film with the two outer edges of the film overlapping each other. This is the beginning of the bag forming process.
Now the film will briefly pause (on intermittent motion packaging machines) so the formed bag can receive its vertical seal. The vertical seal bar, which is hot, moves forward and makes contact with the vertical overlap on the film, bonding the layers of film together.
Next, a set of heated horizontal sealing jaws come together to make the top seal of one bag.
Below is the bag sample that we made.
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