1. Transparent film or plastic containers, despite having a certain moisture resistance and airtightness, compared with cans and bottles made of metal or ceramics, the air permeability and airtightness of plastic film is not zero, but with temperature and As the humidity rises, it rises.
2. The characteristics of different types of plastic film are different, so it is necessary to clarify the characteristics of each and the nature of the contents. Packages such as biscuits, pastries, and medicines need to be highly moisture resistant to maintain their original flavor. The packaging of vegetables and fruits is not the same. If moisture-proof plastic films are used, it will bring side effects because fresh fruits and vegetables need a proper amount of oxygen to supply their freshness.
3. One-sided pursuit of reducing the cost of packaging materials is not correct, but should meet the "quality packaging" under the premise of choosing the right quality of the film.
Reprinted from: Chemical Information Port