Patent ID: 7506529
Filing Date: 2009-03-24
Classification: B21D,Y10S

Abstract:
1. A method for producing a cylindrical, seamless can body ( 20 ), that is without any outward protruding portion on cylindrical side thereof, with a preset height and a top end ring ( 22 ) made of metal, wherein the top end ring ( 22 ) which can be connected to the opening edge of a can body borders a removal opening ( 30 ) and a sealing diaphragm ( 32 ) covering the removal opening ( 30 ) can be attached to the top end ring ( 22 ) to form a can top end ( 38 ), a base ( 14 ) is seamlessly integral with the cylindrical, seamless can body ( 20 ), the cylindrical, seamless can body ( 20 ) is without any inward protruding portion on cylindrical side thereof except in region where the base ( 14 ) and the cylindrical, seamless can body ( 20 ) seamlessly integrate, the method includes producing a cylindrical seamless can body blank ( 10 ), that is without any outward protruding portion on cylindrical side thereof, and that is without any inward protruding portion on cylindrical side thereof except in region where the base ( 14 ) and the cylindrical, seamless can body blank ( 10 ) seamlessly integrate, in a plurality of drawing steps, separating a cylindrical ring ( 18 ) therefrom, following separation of the cylindrical ring ( 18 ), further shaping the can body blank ( 10 ), that is without any outward protruding portion on cylindrical side thereof, and that is without any inward protruding portion on cylindrical side thereof except in region where the base ( 14 ) and the cylindrical, seamless can body blank ( 10 ) seamlessly integrate, in at least one further drawing step into the can body ( 20 ) with the preset height, and shaping the cylindrical ring ( 18 ) into the top end ring ( 22 ).