What is aluminum bag tightness? In life, we sometimes find that some aluminum foil bags of cooked food, always feel a little air leakage, the bag is not like a vacuum seal, taste is not delicious enough, which may be your aluminum foil bag food sealing is not good, that is, there is air leakage phenomenon. Therefore, testing the sealing performance of aluminum foil bag is a strong and safe barrier to ensure the overall integrity of food packaging and food shelf life. The following for you to introduce the aluminum foil bag tightness test knowledge.
Test method for tightness of aluminum foil bag:
1. Check the smoothness. The specific method is to extract several samples of finished product bags for "air-to-ground" dropping, let them land naturally and in a clean place, and observe the situation after landing sealed aluminum foil bags. If the sealed aluminum foil bag bends outward or arches inward when it lands, it indicates that the flatness of the sealed aluminum foil bag is poor; otherwise, it indicates that the flatness is good.
2. The visual inspection of appearance also includes the inspection of transparency. Some products because of large areas of no pattern, transparency is particularly important.
The detection method of transparency is: extract a finished product bag, observe through the indoor indirect light source, if there are "pitted spot", "ring", "mist" and other phenomena in the blank, it indicates poor transparency, and vice versa.
3. Aluminum foil bag sealing tester
Make the sample immersed in the vacuum chamber water to produce internal and external pressure difference, observe the gas escape in the sample, in order to determine the sealing performance of the sample; The sealing performance of the sample can also be determined by vacuuming the vacuum chamber to produce internal and external pressure difference of the sample, observing the specimen expansion, the specimen shape recovery after releasing the vacuum and the liquid infiltration.
Sealing test standard of aluminum foil bag:
GB/T 22638.7-2016 Aluminium foil -- Test methods -- Part 7: Determination of heat seal strength
Plastic and aluminum foil composite film and bag for food packaging
The above is a small series for you to summarize the sealing method of aluminum foil bag, learned? Go ahead and try it.
