What is the function of the packaging? Why need packaging?

  •  2021-10-11

Food is indispensable and irreplaceable in our lives, so have you ever thought about why the food we see is packaged.

The necessity of food packaging

From the point of view of the steps of food production and product sales, the purpose of food packaging is mainly to prevent food from spoiling, and at the same time, the most important thing is to ensure the quality of food. Packaging is an important medium to ensure food quality and reduce food waste, and it is also an effective way to reduce the addition of preservatives in the food production process. The packaging has important functions of installing food, preventing food from spoiling, appearing damage and avoiding infringement. At the same time, packaging can also provide consumers and sales personnel with necessary relevant information, and convey to them the relevant characteristics of the product and the nutritional information of the food in the package.


Food packaging is not only closely related to the health of consumers, but also to the reputation of the company; it can also prevent microbial and dust pollution. Although manufacturers are now paying more and more attention to the sanitation of production lines, suspended dust still cannot be completely avoided and isolated. In the process from product production, packaging to sales, there are many opportunities for food to come into contact with people, air, and various tools and equipment. This also shows that food is actually very susceptible to contamination by microorganisms and dust. Packaging food is also responsible to consumers. If consumers eat heavily contaminated food, it will cause food poisoning. With packaging, a reasonable packaging design can simplify transportation conditions and extend the time for goods to be placed on the shelf, which is also a way to reduce waste. Therefore, food must be packaged to prevent secondary pollution.

Causes of air leakage in packaging swelling bags

Good food packaging not only requires attention to design, but more importantly, the packaging effect must be paid attention to. Packing swelling or leaking is the most common packaging defect in food vaccum packaging. For vacuum packaging, air tightness is an important criterion for considering this packaging.

The reasons for bag expansion or air leakage of vacuum packaging may be as follows:

The first is that the bacteria in the vacuum packaging bag multiply and produce gas, which is also one of the main reasons for the flatulence of the vacuum packaging bag. On the premise that there is no quality problem in the packaging bag itself, if the food packaged in the bag is not completely sterilized, it will rapidly multiply in the bag, and the phenomenon of bag swelling will occur over time.

Lax sealing is also one of the reasons. The packaging bag sealing process is an important key in the packaging process on the packaging line. Whether it is vacuum packaging or inflatable packaging, the requirements for packaging and sealing have never been lowered. After the food is bagged, it will be heat-pressed and sealed in the next process of the packaging line. The quality of this process will directly affect the air tightness of the vacuum packaging bag. If the sealing effect of this process is not good, the sealing edge is not tight enough, it is very likely that the vacuum packaging bag will leak. When the external air enters the packaging bag through the leaking part, the vacuum packaging will also produce bag expansion.

primary package

When the storage temperature changes from time to time, condensed water will be generated in the package in an alternate hot and cold environment, which will also cause the package to look bloated. And long-term contact between food additives and food sometimes produce gas.

Packing level

Primary packaging is the layer of packaging that is in direct contact with the product. Primary packaging is an important line of defense between the products in the package and the outside world. For fast-moving products, primary packaging is also an indispensable packaging process. Some primary packaging needs to be discarded after the product is used up, such as some beverage bottles, potato chip bags, etc.; some primary packaging needs to be discarded at the beginning of use, such as some packaging bags for fast food sandwiches and other items.

The secondary packaging is the big packaging bag that sums up many primary packagings. To put it simply, when you buy a full box of drinks in a supermarket, the box that packs the scattered drinks in one box is the so-called secondary packaging. Some product-related information is often printed on the secondary packaging, which can play a role in attracting buyers and promoting companies to a certain extent.


The primary packaging and secondary packaging will overlap in most cases. For many products on the market that people can see, the primary packaging is the secondary packaging. Merchants print and advertise on primary packaging, which in turn gives primary packaging the role and function of secondary packaging.

If you want to distinguish between primary packaging and secondary packaging more intuitively, you can observe the packaging of drugs. For example, when we get a drug for the first time, the cardboard box that can be reached by both hands is the secondary packaging. There should be relevant information about the product and the company on the secondary packaging, which will serve as a message to consumers. The packaging of the medicine directly wrapped in the box is the primary packaging.

The third-level packaging is mainly used for the transportation of goods to ensure that the goods will not be damaged during the transfer from A to B. For example, in the transportation of large machinery, the wooden boxes used by the packaging machinery and the plastic film used for packaging belong to the category of tertiary packaging.

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