Embossing device for embossing a cellulose web material and related method
AssigneeValmet Tissue Converting S.p.A.
InventorsFranco MONTAGNANI, Matteo GALOPPINI
Life of this patent
Estimating the term…
Abstract
The embossing device includes one or more cameras with respective lighting and image acquiring systems to acquire images of one or more plies of the produced cellulose web material. The images can be used to detect any defect in the produced material and to alarm, or signal the need for intervention on an embossing device. Based on the defects on the product detected by processing the acquired images, it is also possible to directly intervene on functional units of the embossing device, to remove or reduce the defects.
Claims34
1-33. (canceled)
An embossing device for producing an embossed web material including at least a first embossed cellulose ply;
- wherein the embossing device comprises:
- a first embossing roller provided with a plurality of first embossing protuberances;
- a first pressure roller that forms, with the first embossing roller, a first embossing nip, through which a first feed path for feeding a first cellulose ply passes;
- wherein a first actuator is adapted to press the first embossing roller and the first pressure roller against each other;
- an exit path for an embossed web material including the first embossed cellulose ply;
- and
- a first vision unit arranged along the exit path for the embossed web material and comprising a first camera adapted to detect defects in the embossed web material.
A method for producing a web material including at least a ply embossed by an embossing device;
- the method comprising steps as follows:
- feeding a first cellulose ply along a first feed path through a first embossing nip between a first embossing roller, provided with a plurality of first embossing protuberances, and a first pressure roller;
- wherein the first embossing roller and the first pressure roller are pressed against each other by a first actuator;
- feeding an embossed web material, including the first embossed cellulose ply, towards an exit path for the embossed web material;
- acquiring images of the first embossed cellulose ply through a first vision unit that is provided along the exit path for the embossed web material and comprises a first camera, and checking if the first cellulosic ply includes an embossing defect.
Dependencies are inferred from the claim text.