Method and machine for producing logs of web material and tearing the web upon completion of the winding of each log
AssigneeFabio Perini S.p.A.
InventorGuglielmo Biagiotti
Life of this patent
Estimating the term…
Abstract
A surface rewinding machine for the formation of logs of web material has a winding roller (1) onto which the web material (N) is fed. The winding roller has a surface portion (1A), extending substantially parallel to the roller axis and having a coefficient of friction lower than that of the adjoining surface. The web is pressed at preset moments by a pusher (3) against that portion of the surface of the winding roller having low coefficient of friction so as to tear the web material.
Claims14
A surface rewinding machine for the formation of logs of web material comprising at least a winding roller onto which the web material is fed, wherein:
- said winding roller has a surface, a length and an axis, and a surface portion extending substantially parallel to the roller axis and an adjoining surface, said surface portion having a coefficient of friction lower than that of the adjoining surface located upstream with respect to the material-feeding direction,
- means are provided which, upon completion of a log, pinch the web material against said surface portion, thereby causing said web to slide on said surface portion and the web to tear between the pinching point and the finished log.
A method of producing logs of web material, including the steps of:
- providing a first winding roller having an axis;
- feeding said web material around said first winding roller and forming a log with said web;
- upon completion of a log, severing the web material when the log is completed with a pre-determined quantity of web material wound thereon;
- and, after severance of the web material, winding the incoming web to form a new log;
- providing on said winding roller a surface portion and an adjoining surface, said surface portion having a coefficient of friction lower than that of the adjoining surface located upstream with respect to the web feeding direction, said surface portion extending approximately parallel to the axis of the roller;
- upon completion of a log, pinching the web material against said winding roller at said surface portion having a lower coefficient of friction, whereby causing the web material to slide along said surface portion and to tear the web between the pinch point and the finished log.
Dependencies are inferred from the claim text.