| 摘要 |
The invention relates to a device for wall-ironing sleeves (10), e.g. can bodies, containers etcetera having a wall portion near the open end with a thickness enlarged with respect to the wall thickness of the sleeve body, said device comprising at least two wall-ironing rings (2, 3, 4) and a wall-ironing mandril (8) movable through said rings (2, 3, 4) and having a relatively broad cylindrical front part (1) and a relatively narrow, cylindrical rear part. The invention provides a device of the kind set forth above in which the front part of the wall-ironing mandril, at the end facing the rear part, exhibits an annular recess (9) of a predetermined depht, the position of said recess (9) being such that after having passed through the wall-ironing ring last but one the sleeve wall has at least partly reached the recess, and that the material being located at the area of the recess after having passed through the wall-ironing ring last but one is located at least partly at the rear part after having passed through the last wall-ironing ring. |
