| 摘要 |
When curling the rim (2) of a cup (1) consisting of sheet material (paper cup) by means of a curling ring (17) pressed axially against the rim to be curled, friction is reduced by subjecting the curling ring to an alternating relative movement, in particular wobbling movement. In order to produce the wobbling movement, the curling ring is supported axially on an inclined, rotating face which can be produced by the bearing points of three rollers (13, 14). <IMAGE> |
