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Introduction
Ukrainian manufacturer Pamibro has been making paper
bags for the construction, chemical, and food industries
at its factory in the western city of Broshniv for more than
20 years. Today, the company is the country’s largest paper
bag manufacturer. Pamibro first invested in a Windmöller
& Hölscher (W&H) paper bag line in 2007 – a decision that
brought great success along with it. So it is perhaps no
surprise that the manufacturer recently installed a second
W&H system, comprising an AM 8125 tuber, an AD 8320
bottomer, two TRANSYSTEMS automated material flow
systems, and an ARCOMAT 3 palletiser.
Tuber upgrade
The new tuber gives Pamibro a very high degree of
automation, which means that all settings of the tube
dimensions are transmitted directly to the proper tool
positioning. Drives with integrated encoders ensure that
all tools are moved automatically into the right positions
(Figure 1). Pamibro’s skipped vent hole perforation unit
features a turret system in which up to four different
needle rollers can be installed. This turret system allows
quick needle roller selection and roller changes, while the
skipping function prevents the bottom areas from being
perforated and thus weakened. Switching from skipped
to continuous perforation can be done during tuber
downtimes and is technically realised via transmission
gears. Brush rollers that swing on/off pneumatically serve
as counter rollers. The penetration depth is adjustable in
order to vary vent hole diameters and thereby influence
the de-aeration performance.
Pamibro benefits from this machine setup in terms
of shorter setup times and faster job changes. “These
advantages are of even more importance as, nowadays,
job orders become smaller and smaller. Moreover, using
Strong
on paper,
strong in
practice
Dominik Wörsdörfer,
Windmöller & Hölscher,
examines the case of Ukrainian
paper bag manufacturer
Pamibro, which improved
production through automation.