Frozen
food packaging materials must meet the following conditions: 1, the inner packing plastic should have good blocking the role of water vapor and oxygen permeability.
2, plastic has good cold resistance, if the cold resistance of packaging materials is bad, in the later in the process of transportation loading and unloading, frozen food packaging sharp spike will prick, cause leakage, accelerate the corruption of the food.
Frozen food packaging usually choose high separation, high intensity of the inner packing material, the other by composite or co-extrusion increase cold resistance and mechanical strength of the inner packing material.
Frozen food used in the field of plastic flexible packaging mainly divided into the single bag, compound RuanSu compound bag, multi-layer co-extrusion RuanSu bag, edible packaging film, etc.
Flexible packaging there are quite a number of lower cost materials to choose from, including polyethylene ethylene glycol ester phthalate (
PET)
Or polyester (
APAT）
。
These materials can be designed flexibly various three-dimensional shape and size, so this type of soft package can turn enough according to the volume change of the dough, use up is very flexible.
Frozen food packaging should have five characteristics: one is to have a high barrier property, to prevent contact with oxygen and moisture volatilizes product.
Second, the impact resistance and puncture resistance.
Third, low temperature resistant, even in - packaging materials
45 ℃ low temperature circumstances not deformation, not brittle.
Fourth, oil resistance.
Five is health, prevent pervades migration of poisonous and harmful substances in food.
Use of frozen food packaging plastic soft packing is mainly divided into two categories: one is composite packaging, it is the two layers of plastic film together with adhesive, and adhesive is containing ester, benzene and other harmful substances, it is easy to infiltrate the food contamination.
One kind is the international advanced multi-layer co-extrusion high barrier packaging.
It is to use green environmental protection packaging materials production, five, seven, nine layers, it does not use glue but use more than 3 units of extruder, the resin raw materials of different functions such as PA, PE, PP, PET, EVOH, respectively, such as melt extrusion together, with no pollution, high separation, high intensity, flexible structure and so on, it makes the food packaging and packaging materials production process to achieve the free from contamination.
Like seven layers co-extrusion high barrier packaging is composed of two layers above the nylon, make packaging tensile and tear strength greatly improved, resistant to -
45 ℃ low temperature and 120 ℃ high temperature, vacuum degree can reach 100%, not easily damaged frost crack, high and low temperature resistant, resistant to storage and transportation, easy storage, can effectively avoid the water erosion, oxidation and food prevent microbes breeding, so as to extend the shelf life of frozen food.
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