END FACE COVER OF CONTAINER (DESIGN VERSIONS) AND METHOD OF ITS MAKING Russian patent published in 1998 - IPC

FIELD: food industry; closing of metal cans with carbonized drinks. SUBSTANCE: cover has bend to counteract internal pressure. Bend can be located either in place of connection of central panel and circular groove or in base of the latter. In other design version cover has circular peripheral section of reduced thickness as compared with thickness of central panel. End face cover manufactured according to second design version is made by stamping by punch in die hole. Clearance between punch and part of die is less than thickness of blank material size of which exceeds size of die hole. EFFECT: increased strength of end face cover by reducing bending of central panel. 11 cl, 13 dwg