How to prevent the aging of food ton bags?
How to perform quality testing on food ton bags?
It is very important to prevent the aging of food-grade ton bags. Many people do not understand these contents very well, so let's take a brief look at them together.
1. The mechanism of photo-oxidation. The photo-oxidation mechanism of sunlight has two sources: first, direct sunlight, which is directly illuminated by the sun; second, indirect sunlight, due to the reflection of water vapor and dust in the air; the two main sources of sunlight contain infrared rays, which will Lead to a variety of oxidants, easily degradable polymers. Don't underestimate the impact in this regard. Over time, we will find that the aging of food-grade big bags is becoming more and more serious.
2. Ultraviolet rays are the main reason. Since the food-grade ton bags are most exposed to sunlight in terms of storage, transportation, and use, the ultraviolet rays in sunlight have high energy and can promote the production of free radicals and hydroxide compounds, thereby causing The breakage of the molecular chain in polypropylene, so the food ton bag shows the weakening of the stretching ability and so on. In addition, the differences in local temperature and humidity should also be considered.
Next, there are two measurement methods for food grade big bags:
1. It is a drop test. Lift the full-load food-grade ton bag with lifting equipment. The bottom of the bag is more than 0.8m away from the ground, and then drop it vertically to the hard and flat ground. If the content does not overflow, the food-grade ton bag body is not damaged. That means passing this test.
2. It is a stress test. Put the full-load food-grade ton bag on the press machine for pressure test. The pressure added by the press machine is four times the full-load weight of the food-grade ton bag, or use the static load method, that is, the self-weight of the four-layer full-load bag, pressurize it. The time is more than eight hours. In this test, the contents do not overflow and the bag body is not damaged, which means that the food-grade food-grade ton bag has passed this test.