Screw Closure with Flexible Band

A screw closure (10) comprising a screw cap (1) and a tamperproof band (5), wherein the screw cap (1) has a head plate (2) with a cylindrical cap peripheral wall portion (3) provided with a female thread (4) and wherein the tamperproof band (5) has a flexible band (6) and is connected to the lower edge of the cap peripheral wall portion (3) by way of one or more easily tearable elements (7), wherein the flexible band (6) is in the form of a continuously peripherally extending flexible band which distributed over its periphery has a plurality of more easily stretchable portions (8) and therebetween relatively less easily stretchable portions (9), and wherein the more easily stretchable portions (8) are of a smaller wall cross-section, in particular in the folded-over condition, a smaller wall thickness as measured in the radial direction, than the less easily stretchable portions (9), characterised in that the portions with the larger wall cross-section are of an upwardly enlarging, wedge-shaped cross-section, wherein the upper edge of the folded-over flexible band includes the furthest radially inwardly protruding projections (11).