Interaction At The Interface Between Content And Glass Surface In Glass Containers (In Italian)

After the description of some basic concepts regarding the chemical and structural nature of glasses used for the production of glass containers and the possible mechanisms of interaction between their surface and water, the authers compare the data of specific releases of type III soda-lime and type I borosilicate glass containers on which two different treatments have been applied: removal of alkalis at high temperature with sulphur trioxide or ammonium sulphate or creation of a thin barrier layer of pure silica by the sol-gel process. The sol-gel application technique could represent a valid alternative to the process of alkali removal, already largely used in the industry.