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- Mechanically-driven
wrapping machines have
a number of limitations:
- the machines need to be mechanically adjusted
for product changeovers. This requires skill
and takes time.
- registration control requires the use of
a variable ratio gearbox which is an expensive
item and one that is also prone
to wear.
- the limp motion of the end crimps
approximates to a constant velocity during
sealing; its variation in speed is also
restricted.
- a no-product-no-bag feature is difficult
to
achieve mechanically.
- registration is maintained by making
coarse corrections.
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