Easy open can end

US4802603A · kind A · utility

Assignee

• The Broken Hill Proprietary Company Limited · AU

Inventors

• Gunter Schmidt · Reutlingen, DE
• Hans-Dieter Joge · Neuwied, DE
• Wilhelm R. Sauer · Neuwied, DE
• Abraham C. Spruit · Beverwijk, NL

Key dates

• Filing date: Nov 16, 1987
• Grant date: Feb 7, 1989
• Expiry date: Nov 16, 2007

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B65D2205/00
• WIPO field: Handling
• WIPO sector: Mechanical engineering

Abstract

A can end (1) made from metal for cans whose contents is under inside pressure is provided with at least one opening tab (4) partly punched from the end leaving a hinge area (6) and a relative aperture (2) formed by the partial punching, with the opening tab (4) and/or the area of the end surrounding the aperture (2) being cold formed so that the edge area (8) of aperture (2) covers the edge area (4a) of opening tab (4) on the end outside (1a). On the end inside (1b), plastisol (10) is applied in ring-form to the edge areas (4a, 8) of opening tab (4) and of aperture (2) and jellied under heating. Before its application and gelation respectively, the plastisol (10) has a viscosity .eta..sub.D4441s -1 (40.degree. C.) of about 2000-2800 mPa.s, and an edge angle .alpha. of about 0.4-1.0 N/mm.sup.2, and a maximum elongation of 120-250%.