Package for pourable food products and method for moulding a polymeric opening portion

A method for providing an opening portion for a package for pourable food products, the method comprising:

• adding sodium sulphite particles to a polymer composition to form the opening portion of the package, wherein none of said sodium sulphite particles have a size greater than 75 micrometers, and wherein an average size of said sodium sulphite particles is below 25 micrometers;
• and
• forming the opening portion by moulding, said opening portion comprising a weakening feature having a thickness below 200 micrometers and being thinner than parts of the opening portion directly adjacent to said weakening feature.

A package for pourable food products, the package comprising a package container body and an opening portion moulded onto said package container body so as to form an interface between said package container body and said opening portion, the package container body comprising an oxygen barrier material, the opening portion comprising a polymer composition comprising sodium sulphite particles, wherein none of said sodium sulphite particles have a size greater than 75 micrometers, and wherein an average size of said sodium sulphite particles is below 25 micrometers.