Embossing device with at least one heated embossing roller, and method
AssigneeValmet Tissue Converting S.p.A.
InventorsFabrizio Lorenzi, Leonardo Boschi
Life of this patent
Estimating the term…
Abstract
The embossing device includes—a first path for a first ply of web material; —along the first path, a first embossing roller provided with embossing protrusions; —a first heating device associated with the first embossing roller to heat the surface of the first embossing roller; —at least a first functional roller adapted to perform an action on a ply of web material. The first functional roller is provided with a rotation arrangement, adapted to keep the first functional roller in rotation during a temporary stoppage of the embossing device, with the first functional roller spaced from the first embossing roller and with the first ply of web material stationary in the first path.
Claims33
An embossing device comprising:
- a first path for a first ply of web material;
- along the first path, a first embossing roller with embossing protrusions;
- a first heating device associated with the first embossing roller to heat a surface of the first embossing roller;
- at least one first functional roller adapted to perform an action on a ply of web material;
- a control unit;
- wherein the at least one first functional roller is provided with a rotation arrangement, adapted to keep the at least one first functional roller in rotation during a temporary stoppage of the embossing device, with said at least one first functional roller being spaced from the first embossing roller and with the first ply of web material being stationary in the first path;
- and wherein the control unit is configured to control the rotation arrangement such that the at least one first functional roller is maintained in rotation during the temporary stoppage of the embossing device.
A method for managing a temporary stoppage of an embossing device comprising a first path for a first ply of web material;
- along the first path, a first embossing roller provided with embossing protrusions;
- a first heating device associated with the first embossing roller to heat a surface of said first embossing roller, and at least one first functional roller adapted to perform an action on a ply of web material;
- wherein the method comprises steps as follows:
- maintaining the first ply of web material substantially stationary along the first path;
- rotating said at least one first functional roller, and maintaining a substantially uniform surface temperature of said at least one first functional roller, while the first embossing roller is at a temperature higher than the temperature of the at least one first functional roller.
A method for managing a temporary stoppage of an embossing device comprising a first path for a first ply of web material;
- along the first path, a first embossing roller provided with embossing protrusions;
- a first pressure roller defining with the first embossing roller a first embossing nip, through which the first ply of web material passes;
- a second path for a second ply of web material;
- along the second path, a second embossing roller, provided with embossing protrusions;
- a second pressure roller defining with the second embossing roller a second embossing nip, through which the second ply of web material passes;
- a first heating device configured to heat a surface of the first embossing roller;
- wherein the method comprises steps as follows:
- maintaining the first ply of web material substantially stationary along the first path and the second ply of web material substantially stationary along the second path;
- moving the second pressure roller away from the second embossing roller;
- rotating the second embossing roller to maintain a substantially uniform surface temperature of said second embossing roller, while temperature of the first embossing roller is higher than the temperature of the second embossing roller, the second embossing roller sliding on the second ply of web material.
An embossing device comprising:
- a first path for a first ply of web material;
- along the first path, a first embossing roller provided with embossing protrusions;
- a first pressure roller defining with the first embossing roller a first embossing nip, through which the first ply of web material passes;
- a second path for a second ply of web material;
- along the second path, a second embossing roller, provided with embossing protrusions;
- a second pressure roller defining with the second embossing roller a second embossing nip, through which the second ply of web material passes;
- a first heating device adapted to heat a surface of the first embossing roller;
- wherein the second embossing roller is combined with a rotation arrangement configured to maintain the second embossing roller in rotation during a step of temporary 1 stoppage of the embossing device, with the second ply of web material and the first ply of web material stationary in a respective one of said first path and said second path, the second pressure roller spaced from the second embossing roller and the first embossing roller at a temperature higher than room temperature;
- and wherein the rotation arrangement is controlled to rotate the first embossing roller and the second embossing roller during the step of temporary stoppage of the embossing device.
Dependencies are inferred from the claim text.