| 摘要 |
<p>A conveying and folding cylinder suitable for installation on machines for folding paper material having the side surface consisting of a metal part and of a part made from material with a high friction coefficient, such as rubber, wherein the metal part and the part with a high friction coefficient are arranged alternately in order to form on the surface two paris of opposing helices each extending from the middle of said cylinder toward one of the ends.</p> |
