Patent ID: 8123451

Claim:
An apparatus for forming a closure for fixing to an open end of a container body, the closure comprising: an annular component including a substantially flat sealing surface extending radially inwardly from a wall; a diaphragm fixed to the sealing surface, the diaphragm being substantially in the same plane as the sealing surface, and having a tab extending from its periphery, the tab folded over the diaphragm; in which the apparatus includes: upper and lower reform tools for reforming a sealing surface angle, the lower reform tool having a profile with an angle of 15° to 25°, the upper reform tool having a nose for locating between the wall and the sealing surface of the annular component, and a reform surface extending radially inwardly from the nose; the lower reform tool including a complementary reform surface; wherein the nose is relieved over an arc positioned over the tab, wherein a depth of a tab relief is at least equal to the thickness of a lidding material from which the diaphragm is made, whereby crushing of the tab in the region of the tab relief is avoided, wherein the tab relief is located on the upper reform tool.