| 摘要 |
<p>A paper converting machine, such as a folding and stacking machine, or a rewinding machine, provides a cutting or perforation section (20), equipped with at least one blade (25) that is arranged to work in combination with a stationary knife (26) to provide the division of the web of paper (100) into a plurality of sheets (110) of measured length. The blade (25) can be integral to a fixed support (125), or alternatively to a cutting roller that rotates about a longitudinal rotation axis. The, or each, blade (25) can be a perforation blade, or a cutting blade, for example with helical shape, and is mounted to a perforation roller (125), whereas the stationary knife (26) can be mounted to a fixed roller (126). In both cases, the blade (25) performs a cutting, or perforation, of the web (100) into sheets (110) working in combination with the stationary knife (26). The blades (25) and the stationary knifes (26) are long substantially as the width of the paper, i.e. the length of the roller (125, 126). In particular, the blade (25) has at least one weakened portion (27) of determined size. The presence of the weakened portion (27) has the function of reducing the stiffness of the blade (25) giving higher elasticity without changing the material with which the blade is made. This way, it is avoided that the sheet (110), once cut, adheres to the surface of the blade (25).</p> |
