Maintain the original taste and freshness is best for
food, but actually it is difficult to achieve this standard. Most of the
products are frozen to reach this point. If not by freezing then it is
necessary from the beginning with the packaging. Some package with advanced
production technology and combination with outsourcing materials have manufactured
the character of breathable of breathing.
Want to make the product packaging breath, it is
necessary to built-in desiccant, preservatives or deoxidizer, in food packaging
to remove the substance of adverse fruits and vegetables preservation, and
water vapor released by ethylene gas. To achieve this effect, it is necessary
to make the bags certain permeability or to prevent the leakage of the bag
material. In the middle, the permeability is important physical parameters of
the paper packaging bag, which can determine the usage of different wrapping machine.
This package of material is rare in the packaging machinery industry, is a kind
of new things.
The idea there, followed by specific practical work, then
they would have selected from the packaging material for this can be controlled
atmosphere packaging. It is necessary according to the characteristics of the
actual product packaging material permeability reasonable choice. Under normal
circumstances, the gas used for modified atmosphere packaging is a gas mixture
of oxygen, nitrogen, carbon dioxide, or oxygen. The irrational distribution of
packaging materials into packaging
machine production line can cause serious consequences.
There are two test methods on permeability testing:
pressure method and the arithmetic method. Pressure method can only check the
oxygen and carbon dioxide, can not detect nitrogen; the arithmetic method is
different. It can detect except oxygen and carbon dioxide outside the nitrogen
detection with lower test costs. Therefore, in the MAP, the packaging machine industry
is all used in this method.
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