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The following processes are carried out in the sealing station:
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Pressing the outer edges of the upper and bottom film together.
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Creating a vacuum in the packaging.
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Filling the packaging with a gas to prevent the packaged product from spoiling.
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Sealing the packaging by melting the upper and bottom film together.
The filled and sealed packaging is again moved forward one stroke length and arrives at the
cross cutter (see paragraph 3.9). The packaged products remain supported between the
sealing station and the cross cutter. At the cross cutter the packaged products are partially
separated from one another and, if required, holes are made to enable the packages to be
hung up if so desired. The packages are again supported and transported to the longitudinal
cutter (see paragraph 3.10). Here rotating blades cut the packages loose. The separate
packages land on a conveyor belt (see paragraph 3.11) and exit from the machine.
3.2
Description of machine frame
The parts are made of stainless steel, aluminum and plastic (HMPE 500). These materials
were chosen to keep corrosion to a minimum. This is to the advantage of hygiene and the
machine’s lifespan. The previous paragraph described the entire process in simplified form.
All the machine parts described there will be further described in the paragraphs below. The
illustrations can vary depending on the machine’s configuration.
The frame is made of stainless steel profiles (see Figure 3.2) that can vary in length
depending on the design of the machine.
In order to enable the machine to package the maximum number of different products its
construction is modular. The various modules can be fixed to the function buses in the frame.
Function buses not in use can be closed off with a plastic stopper to prevent the
accumulation of waste materials or water. The side of the machine is fitted with removable
side plates to protect the various pieces of equipment. The machine stands on eight
adjustable plastic feet made of HMPE 500.The frame is fitted with two chain tracks that guide
the film through the various modules.
detail: frame profile
with function buses
Figure 3.2 Frame