| 摘要 |
<p>Apparatuses for reforming web-shaped packaging material into tube form operate, in prior art packaging machines, with the aid of annularly disposed forming rollers which cause the longitudinal edges of the web to overlap so that they can be sealed to one another. In order to prevent the packaging material tube from being entrapped between the rollers (12), the rollers may be provided with one chamfered and one straight roller edge (18, 19) which cooperate such that the nip therebetween is directed more or less tangentially to an adjacent portion of the packaging material tube.</p> |
