Patent ID: 7334977
Filing Date: 2008-02-26
Classification: B21D,Y10T

Abstract:
1. A process for production of a lid ring ( 30 ), that can be connected to a can body, and that borders a discharge opening ( 38 ) and has a heat-sealable coating ( 40 ), on which to form a can lid ( 50 ) a closing membrane ( 44 ) can be heat-sealed covering the discharge opening ( 38 ), in which process a metal strip ( 12 ) with parallel side edges ( 14 , 16 ) is formed into a tube ( 20 ) and the side edges ( 14 , 16 ) are welded or glued parallel to the tube longitudinal axis (x), the tube ( 20 ) is divided into tube sections ( 24 ) of equal length with cut edges ( 26 , 28 ) lying in parallel planes, and the tube sections ( 24 ) are molded into lid rings ( 30 ), where a first cut edge ( 26 ) is formed into an outer rim ( 32 ) for connection with the can body and a second cut edge ( 28 ) is curled, the second cut edge ( 28 ) is curled away from a side ( 56 ) of the lid ring ( 30 ) intended for the heat-sealable coating ( 40 ), the heat-sealable coating ( 40 ) is applied to the side ( 56 ) of the finished molded lid ring ( 30 ) intended to be outside of the finished molded lid ring ( 30 ), and a heat-sealable lacquer coating ( 42 ) is applied to side ( 58 ) of the finished molded lid ring ( 30 ) intended to face interior of the can body.