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November 2018
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World Cement
the machine-integrated job management system, Pamibro
is able to save all job data, which makes it easy for them to
run jobs for the second time,” explained Reinhard Elting,
Head of Sales for Eastern Europe at W&H.
By providing production speeds up to a maximum
of 500 tubes/min., the tuber is able to feed high-speed
bottomers with ease. It can be designed for stepped-end
tubes and/or flush-cut tubes. In order to handle a PE-film
as an intermediate layer, Pamibro’s tuber is equipped
with a dedicated unwinder for PE-film and an additional
ionisation unit. This ionisation unit is placed before tube
forming takes place. It ensures that the flimsy PE-film
stays in the right position for tube forming, which means
that temporary clinging of the PE-film to the paper ply
through electrostatic charge is achieved.
An automatic web tension control system is also part of
Pamibro’s tuber. This means that the desired web tension of
each individual ply can be adjusted by digital input. During
production, this web tension is kept to the targeted value,
thanks to the automatic control system, including tension
sensing rollers and electrically driven draw rolls.
This latest machine investment is helping Pamibro to
deliver cement bags and all-purpose sacks to its customers
even faster and more reliably. “With this investment,
Pamibro can keep up with the ever-rising demand for
high-quality paper bags. And it is also helping us to
meet Ukraine’s tightening environmental protection
regulations,” said company owner, Prof. Ilya Shutak. One
essential prerequisite for good optical product quality is
the belt tear-off unit installed at the tuber. With the belt
system, unattractive marks on the final sack are avoided
and the outer paper ply is treated carefully. With an
advanced shingle conveyor system, Pamibro obtains the
proper tube formation before the shingle interrupter
permits the flow separation, which it does upon reaching
a preset number of tubes. Transfer belts accelerate the
tubes to the packet forming station. Different surface
properties of the tubes are taken into account by
adjustable belt speeds.
Bottomer upgrade
Quality and flexibility in sack design is what the new
bottomer primarily gives to Pamibro. “As the bottomer is
equipped with a hinge and a valve unit, and in addition
both units are ready for two ply applications, Pamibro is
able to meet all customer needs in terms of valve designs,”
Elting explains. A universal cutting assembly is installed
at the valve unit, which can be used for a non-blocking
perforation cut of the PE web, for cutting out thumb
notches or for producing fringe valves at choice. Designed
for providing multi-purpose sacks, the bottomer is capable
of producing sack dimensions from 25 cm up to 118 cm
in length and from 18 cm to 60 cm in width, while the
bottom size ranges from 7 cm to 18 cm. The maximum
production speed of the bottomer is set to 330 sacks/min.
Highly-sophisticated inline bottom patch printers
with sleeve technology ensure high print qualities and
less downtime (Figure 2). The bottom patch printers are
installed as free-standing units between the bottom patch
unwinds. These patch printers offer a central impression
cylinder and can be equipped with up to four printing
decks each. Chambered doctor blade units serve as an
inking system. Pamibro reduces downtimes with the
included colour deck make-ready unit, which allows job
preparation for two colours at one deck side, while the
current job is still running.
The carrying handle and the easy opening tear
strip unit underline the bottomer’s versatility and give
Pamibro flexibility in designing highly-sophisticated sacks.
Additionally, a high degree of automation comes along
with the bottomer, which means that job changes can be
Figure 2. Miniflex patch printers ensure high print
quality, flexibility, and downtime reduction with the
integrated colour deck make-ready feature.
Figure 3. At the Pamibro plant in Ukraine, two W&H
machines work almost around the clock to produce
high-quality paper bags.
Figure 1. The direct path from size to size: positioning
drives with integrated encoders are essential for a high
degree of automation.