Abstract: An easy open ecology end consisting of a removable section defined in an end panel and a tab for severing the removable section is disclosed herein. The removable section or disc is defined by a weakened score line and the tab has an opening edge aligned with at least a part of the inner edge of the score line with the opening edge having primary contact means for producing initial rupture of the score line. The tab is attached to the end using a unique method which will produce internal stresses in the metal of the tab so that the tab is constantly urged toward the surface of the end. The tab also has an opening therein aligned with the removable section and is designed to be locked into the opening created by severing the weakened line.

Abstract: A method of forming a removable section in a metal wall portion of a container is disclosed herein. A first, area of reduced cross-section is coined the wall portion outside the first coined area and most of the displaced metal is forced inside the first area so that the portion inside the first area is in compression and is substantially dish-shaped in cross section, a weakened line is then produced in the first area to define a removable section.

Abstract: An easy open ecology end consisting of a removable section defined in an end panel and a tab for severing the removable section is disclosed herein. The removable section or disc is defined by a weakened score line and the tab has an opening edge aligned with at least a part of the inner edge of the score line with the opening edge having primary contact means for producing initial rupture of the score line. The tab is attached to the end using a unique method which will produce internal stresses in the metal of the tab so that the tab is constantly urged toward the surface of the end. The tab also has an opening therein aligned with the removable section and is designed to be locked into the opening created by severing the weakened line.

Abstract: An easy open ecology end is disclosed herein and includes an end panel that has a removable section defined by a weakened score line. A tab is secured to the removable section and the tab and removable section are designed so that both remain captive with respect to the end panel when the weakened score line is severed. The weakened score line is produced by a unique three step process and has an area of reduced residual which is first severed when a force is applied to the tab so that the container is vented before the remainder of the residual is severed. The tab is designed to produce a localized initial pressure to initially sever the area of reduced residual and then sever the remainder of the score line.

Abstract: The present invention relates to a easy open end of the type that has a tab connection thereto by an integral rivet. The invention resides in an improved method for forming a weakened area or frangible connection between the permanent section of the panel and the removable section. The frangible connection in the panel is formed in such a manner that the removable section is relieved of any compressive forces that may have developed during the formation of the frangible connection. In addition, the removable section of the panel incorporates a further area of reduced cross-section that allows the tab and rivet to be pivoted relative to the removable panel section during initiation of rupture of the frangible connection and provides a vent for the inside of the container prior to the rupture of the fangible connection.