In a system of packaging of foodstuffs in containers of rectangular horizontal section, each open-topped container is sterilized, filled, and closed with a sterilized closure. The closure is of a laminate including a thermoplastics layer of sufficient thickness to fill an internal discontinuity of the...http://www.google.com/patents/US4978056?utm_source=gb-gplus-sharePatent US4978056 - Packaging
