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prevent bacterial contamination and easy to eat. For this purpose, the packaging material is required to have the conditions: a certain mechanical strength (high temperature resistance); having a barrier (gas and liquid height blocking); tolerance and the contents may be (acid, oil); sexual health; resistance operability. Currently, frozen food packaging, there are two categories: hard and soft type type. Type of soft plastic film is based. Thick rigid packaging, such as some of the thicker Zhibaozhuanghe, aluminum foil stamping-type containers, the former accounting for a large proportion. Now on the market for frozen food packaging and more common following structure: Performance OPP / LLDPE this structure can reach moisture, cold, low temperature heat sealing tensile strength, etc., the cost is relatively economical; packaging performance NY / LLDPE this structure can withstand freezing , impact resistance, puncture, relatively high cost structure of the product packaging better performance in frozen products are also used, but the relatively low utilization; addition there is a simple PE bag, such as vegetables and packaging; over several product struc
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