Thermal transfer-how to test the sealing of food packaging

Thermal transfer-how to test the sealing of food packaging

Many foods rot and deteriorate during storage. Many of the factors are due to the good barrier performance of the film and the poor sealing of the food packaging bag. Today, let's talk about the sealing of food packaging bags.

The commonly said sealing refers to the packaging bag blocking other external substances from entering the packaging bag or the overflow of the inner packaging. In the process of food packaging, because there are many production links, it is very likely to cause leakage and pressure penetration of heat sealing, resulting in poor sealing, which will have a greater impact on food safety issues, especially some small holes that are not sealed well, which will cause the food to be directly exposed to the outside air, losing the meaning of the packaging bag to keep fresh.

For food sealing, it is necessary to carry out sealing tests before and after packaging to check whether the packaging is intact and sealed in time.

For example, for liquids such as milk, we can find out if there is any leakage by squeezing it with our hands. As long as there is no leakage, the sealing is good. But how to test the sealing of solids such as biscuits and bread?

Generally, the vacuum method is used to test the sealing. Put the biscuits into water and vacuum the outside. If the packaging bag is not sealed well and leaks, bubbles will be generated like a tire leak. In this way, we can intuitively find where the leak occurs.