Fresh-keeping film principle

Fresh-keeping film is a kind of plastic packaging product, which is usually made by polymerization with ethylene as the masterbatch. It is mainly used in microwave oven food heating, refrigerator food preservation, fresh and cooked food packaging and other occasions. It is widely used in family life, supermarket, hotel and industrial food packaging. So, what is the principle of plastic wrap? Let's have a look.

1. Control of gas exchange: fresh fruits and vegetables are a living body after harvest, and they still carry out normal respiratory metabolic activities in the storage process, which is characterized by the consumption of oxygen, the release of carbon dioxide, and the release of a certain amount of heat. The concentrations of oxygen and carbon dioxide in normal air are 20.9% and 0.03% respectively. The PBI activated fresh-keeping bag has a unique adjustable respiratory system, which can appropriately reduce the oxygen concentration in the storage environment and appropriately increase the concentration of carbon dioxide, inhibit the respiration of fresh fruits and vegetables, reduce the respiratory intensity, reduce the metabolic rate, delay aging, and reduce the reduction and consumption of effective ingredients in fruits and vegetables. Low oxygen and high carbon dioxide can also inhibit the biosynthesis of ethylene, weaken the physiological function of ethylene, inhibit the occurrence and development of some physiological diseases, and reduce the decay loss during storage. These are conducive to extending the storage life of fresh fruits and vegetables. The preservation effect of low oxygen and high carbon dioxide concentration is more significant at low temperature.
2. Air permeability and water retention: During the storage and transportation of harvested fruits and vegetables, the water in the body gradually dissipates (generally more than 5% of the water in fruits and vegetables), which causes the surface of fruits and vegetables to shrink and fade (that is, the transpiration of fruits and vegetables). Xi'an PBI fresh-keeping masterbatch is a porous and highly breathable material. The processed PBI physically activated fresh-keeping packaging product has its own breathable micropores and has the function of automatically adjusting the humidity in the bag. It can provide the most suitable humidity for fruits and vegetables, promote the increase of the combined water content in fruits and vegetables that is not easy to evaporate, reduce the rate of water loss, limit the excessive loss of water and nutrients, and maintain the appearance and quality of fruits and vegetables, So as to prolong the preservation time.
3. Sterilization, bacteriostasis and removal of pesticide residues: Generally, the surface of fruits and vegetables we eat will contain bacteria and pesticide residues, which cannot be cleaned by the current washing method, bringing great hidden dangers to our health. Xi'an PBI physically activated fresh-keeping packaging products have unique negative ion sterilization and bacteriostasis, can kill or inhibit the breeding, infection and expansion of various fungi on the surface of fruits and vegetables and in the packaging process, effectively control the harmful factors released when fruits and vegetables mature, and have good decomposition and elimination effect on pesticide residues on the surface of fruits and vegetables. Keep the quality and taste of the products in the bag fresh under appropriate conditions.

Function of preservative film

If you only pack food, the plastic wrap at home will seriously bury its potential. The function of plastic wrap is so powerful! Let's have a look.

1. The remote control is easy to get dirty. Wrap the remote control with a plastic wrap and blow it tight with a hair dryer. Then make a good dust-proof clothes for the remote control.
2. Stick a layer of fresh-keeping film on the top of the refrigerator. After a period of time, you can keep the top of the refrigerator clean and save wiping every day.
3. Keep data. Wrap the important paper materials in the family, such as graduation certificates, with plastic wrap, press the air away with force, reduce the volume, and make it not easy to oxidize and turn yellow, and the transparent plastic wrap is easy to find; You can also roll up individual materials, such as certificates of awards and collective graduation photos, and put them into the plastic film core, and then wrap them with plastic film.
4. Protect the range hood. Wipe the surface of the range hood clean, cover it with plastic film, and replace it after a period of time, thus eliminating the need to wipe the upper wall of the range hood.
5. The fresh-keeping film is the best protective film for the keyboard, which can protect the notebook computer from severe wear due to the lack of film.
6. Put the plastic wrap in the oil box of the range hood, so that when there is oil, you can take it out and throw it away.
7. Convenient picnic. During the picnic, put the plastic wrap on the tableware and take it off one by one. It is free from washing and clean.
8. In winter, the electric fan can be wrapped with plastic wrap when it is not used, and it can be used directly in summer, avoiding the trouble of cleaning.
9. To clean the greasy kitchen windows and walls, first spray the cleaner onto the greasy dirt, then paste the fresh-keeping film on it flat. Use the characteristics of the fresh-keeping film to keep the water from flowing and volatilizing, so that the greasy dirt will soak down after 30 minutes. Remove the fresh-keeping film, knead the fresh-keeping film into a ball, wipe it back and forth easily, and then wipe it with dry newspaper. It will be very clean. You can also wipe it again with a clean cloth.
10. Protect the wall next to the stove. It is unavoidable to splash oil when many guests are eating and cooking at home on holidays or holidays. Remember to wipe the wall next to the stove with a wet rag before cooking, and then affix a fresh-keeping film. After finishing the meal, it is easy to lift it, clean it, avoid the pain of cleaning the wall, and reduce the use of detergent.

  11. Easy to grind. Put the things that need to be ground, such as sesame seeds, into the plastic wrap, put them on the hard table, and then roll them with a bottle to easily obtain the required powder.

12. Help the cutting board thoroughly sterilize. In the kitchen, dilute the bleach to the specified concentration, smear it on the cutting board, and then wrap it with plastic wrap for sealing. After 30 minutes, rinse with water to complete the sterilization. Wrapping with plastic film can make the bleach penetrate into the cracks or pits on the surface of the cutting board and improve the sterilization effect.
13. Care for dry skin. After bathing, apply lotion on the heel, stick a small piece of preservative film, and put on socks. The heel skin will become moist the next day. Of course, the skin of other parts of the body can also be treated in the same way.
14. Lip protection. Before going to bed, do lip exfoliation and maintenance. First, apply a layer of lipstick or vaseline to the lips for a few minutes, then cover the lips with plastic wrap, and then apply a hot towel to warm the lips to have pink and tender lips.
15. When steaming egg soup, after adding water to the bowl, skim off the foam on the top, and then cover the bowl with a layer of plastic wrap. The steamed egg soup will not have pores, and the surface is smooth and the taste is fine.
16. No matter how you brush the glasses and milk bottles at home, they will leave scale after drying, which is very opaque. The use of plastic film can solve this problem. Take a piece of clean plastic wrap and wrap it around your hand to clean the glass. The glass will be very bright and clean.
17. It is difficult to clean plastic lunch boxes with oil. If you encounter this problem again in the future, you can easily wipe off the oil stains that can't be washed off with only one piece of plastic wrap.
18. The sockets in the kitchen can be sealed with plastic wrap when they are not in use, so that the oil will not pollute them. Just take the plastic wrap off when you use it.
19. When making a facial mask, you can apply a layer of facial mask on your face and then stick a layer of fresh-keeping film, which can strengthen the absorption of the face (it is better to use the facial mask that is washed in water, of course, the nose and mouth still need to dig a hole, otherwise you can't breathe).
20. Treat burns. Potatoes have anti-inflammatory, detoxifying and analgesic effects. Grind the peeled potatoes into mud, remove the water, apply it on the top of the wound, wrap it with a plastic film to prevent the evaporation of water, and then complete the emergency treatment.