the punched-out part of the preformed opening is re-inserted in the preformed opening and forming part of the tear panel

Full Title

Containers specially constructed to be opened by cutting, piercing or tearing of wall portions, e.g. preserving cans or tins > Non-integral frangible members applied to, or inserted in, a preformed opening > Details of preformed openings > the punched-out part of the preformed opening is re-inserted in the preformed opening and forming part of the tear panel