1. Tightness test:
If there is a small hole in the box, it is not easy to save food, it will affect the packaging barrier performance on the one hand, on the other hand will make food in the pressure (especially liquid) exudation outside the packaging, pollution of other food and environment. Therefore, we bo new to the test of the iron box, the need to use a sealed tester, the packaging pressure to achieve a certain pressure after static, and then observe the pressure in the packaging to reduce the speed, so as to determine the quality of the seal.
2. Opacity of packaging materials:
A lot of organic food is very sensitive to ultraviolet rays, it will cause oxidation because of ultraviolet rays, so it is necessary to have a certain degree of opacity to block the light, but there are also a lot of packaging need a good transmittance to show the inner product (such as preservation film). In addition, food packaging in close protection of food, but also to consider a number of human factors to facilitate the use of consumers!