On the choice of packaging materials

To keep or maintain a state of the atmosphere of the packaging container, put forward different requirements of packaging materials, plastic packaging materials of air permeability and moisture permeability along with the molecular structure of polymer, film thickness and falling in the humidity and the influence of such factors as changes; Affected by the atmospheric environment after vacuum or inflatable packaging, packaging container oxygen or mixed gas concentration changes of each composition, selection principle of packaging materials is as far as possible to reduce the influence of the atmospheric environment, get as far as possible, long shelf life. According to characteristics of drug preservation, used for vacuum packing of the material requirements for permeability can be divided into two categories: category of high barrier property, packaging materials used for drug anticorrosive vacuum and inflatable packaging, reduce the oxygen content of packaging containers and the change of the concentration of components mixed gas; Another kind is permeability is packing material, used for inflatable packaging drugs to maintain its low breathing rate. Vacuum and air the moisture vapor transmission performance requirements of packing material is the same, the resistance of water yan gas permeability and guarantee the quality the better the more advantage the drug screen printing. Vacuum packing and filling all needs to choose good air tightness of packaging materials. Limited oxygen is the key problem of vacuum, so choose packaging materials should be able to effectively prevent atmospheric oxygen permeability; And inflatable packaging except with good barrier property to oxygen, also must choose for filling gas with good barrier property. Measure the gas permeability of a plastic film generally available to the size of the coefficient of permeability, said the smaller the permeability coefficient, the gas through the difficult of plastic film, air tightness, the better.