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Over the last
few years, manual and fully automatic sealers are most often used, with
semi-automatic sealers relatively little used..
Little speed advantage is gained
from using a semi-automatic sealer. Also, cost is a significant
influence, as automatic equipment can be purchased at prices not much
higher than those for semi-automatic equipment. A manual machine
produces about 10 packs per minute, while a fully automatic machine
produces about 20 packs per minute, with a maximum output of about 25 to
35 packs per minute.
The use of a manual sealer and tunnel has decreased significantly and
been replaced by the use of a combined seal and shrink machine, commonly
referred to as a chamber. These machines have a small footprint and
usually operate from a single phase. The sealer head has a plastic
enclosure and heat is stored within the unit to enable a combined seal
and shrink operation.
Side-seal and flow-wrap machines offer speeds approaching 100 packs per
minute. The purpose remains the same, which is to wrap the pack in a
two-dimensional bag of shrink-wrap film.
Flat film is frequently used, although many machines apply folded film.
The sealer can process individual packs at a much higher rate when it
can seal at a higher rate.
Cross seals require the sealing device to travel with the pack, while
side-seal or overlap-seal mechanisms allow film to be sealed
continuously. These same machines may be applied to other bagging
applications such as the mailing of magazines.
Machinery may be customized to take advantage of a particular
shrink-wrap film's attributes to produce an appropriate pack. One
example is the customization of this process to allow for
modified-atmosphere packaging of food with barrier shrink film.
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