The choose and buy of frozen food packaging bags

Frozen food packaging in material selection, the first to research influence of main components in frozen food, especially the effect of fat, protein, vitamins and other nutrients, sensitive factors including light, oxygen, temperature, microbes, and the influence factors of physical and mechanical aspects. Then according to the requirements of the built-in objects food protection, transportation, environment, etc. , determine the type of frozen food packaging bags and packaging technology mode of operation, in order to achieve the purpose of the protection function and extend storage life. 1, health, from a security perspective, direct contact with food packaging materials, such as plastic bags must achieve food grade. Because of the frozen food packaging and shipping process, it is often difficult to guarantee the whole in a coherent low temperature environment, especially in the process of the transfer and handling, is likely to cause the temperature of the frozen food for a period of time, will happen if the material does not pass, it is easy to breed bacteria. Recycled material or industrial materials packing appearance made of food grade material and do not have too big difference, but because of containing excessive amounts of substances such as plasticizer, once use, can cause great harm to human body health. Usually in - 2, cold resistance, frozen food 18 ℃ or lower temperature storage and circulation, especially the part with frozen food tray, usually put food in the process of production in - with the tray 30 ℃ under the condition of rapid cooling, temperature in - until the product center Below 18 ℃, and then for packaging. Under the condition of the temperature drop, the mechanical strength also drops of packaging materials, packaging material brittle. Moreover, frozen food, in the process of transfer and transportation will inevitably suffer from shock, vibration, pressure, and other environmental hazards. In addition, dumplings, dumplings frozen foods, such as hard under low temperature conditions. Easy to cause burst packet and cracking. This requires good low temperature performance of packaging materials. 3, resistance to impact frozen food in the process of transportation, loading and unloading, and shelf displays vulnerable to external forces of destruction, bags with poor resistance to impact, easy to appear the phenomenon of broken bags, open bags, not only influence the appearance of packaging products, at the same time also can make the food contamination. Impact of frozen food packaging bags can be used a pendulum impact test to determine. 4, heat sealing strength if frozen food bag heat sealing strength is not enough, or virtual, slight shock can cause pincer-like device cracking; If heat sealing temperature is too high, it is easy to cause damage heat sealing layer, make the material of sealing at the intensity is abate, once after strong vibration or shock, easy to cause massive bad broken bags and bags of phenomenon, cannot be achieved with the effective protection of food. 5, tensile force, peel strength between the layers if frozen food packaging peel strength between the layers is small, tensile force is insufficient, the packing bag of poor mechanical properties, easy to cause delamination, packet cannot be achieved due to bearing, which reduces the protection performance of the packet, greatly shorten the shelf life of food. 6, durable thorn, frozen foods frozen tend to be hard, especially fish, meat, contain bones and rigid objects, transport and storage after the products are in the process of extrusion is easy to wear the bags break, ruined the frozen food bags sealing, therefore frozen food packaging bags durable thorn of demanding. 7, the pressure resistance in the process of transport and handling due to vibration, drop or impact of transport packaging, such as internal sales packing damage, even so for frozen food bags to be related to vibration or drop test. In the end, the selected can protect the quality of frozen food, and can reflect the commodity value, and make comprehensive reasonable packaging materials packaging costs.
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