Dispenser and roll of flexible sheet material

1. A dispenser for dispensing flexible sheet material from a roll of material, comprising a roll of material having a core, wherein one end portion of the flexible sheet material is adhered to the core by a pickup glue, the dispenser further comprising:

a sensor for sensing the pickup glue of the roll of material; and

a control unit for triggering at least one action of the dispenser in response to the detection of the pickup glue.

2. The dispenser according to claim 1 , wherein the dispenser includes a dispensing mechanism for dispensing the sheet material from the roll.

3. The dispenser according to claim 1 , wherein the dispenser has at least two drive rollers and the sensor is situated upstream of the drive rollers relative to the flow of dispensing the flexible sheet material.

4. The dispenser according to claim 1 , wherein the sensor is arranged in the proximity of the core.

5. The dispenser according to claim 1 , wherein the sensor is situated on an arm which is arranged to follow the outer surface of the roll.

6. The dispenser according to claim 1 , wherein the sensor is arranged to sense a detectable substance in the pickup glue.

7. The dispenser according to claim 6 , wherein the detectable substance in the pickup glue includes a metallic substance, a magnetic substance, a conductive substance, a coloured substance, a fluorescent substance, or a radioactive substance, or any combinations thereof.

8. The dispenser according to claim 6 , wherein the sensor is arranged to detect the detectable substance on the core of the roll.

9. The dispenser according to claim 1 , wherein the sensor is an acoustical sensor, an inductive sensor, a magnetic sensor, a capacitive sensor, a resistive sensor, a conductive sensor, a light sensor, a camera, a UV light sensitive sensor, or a radiation sensor, or any combinations thereof.

10. The dispenser according to claim 1 , wherein the control unit is configured to trigger a replacement of a core by a full roll of flexible sheet material in response to sensing of the detectable substance, to awaken other systems, or to trigger actions to alert the service personnel of the upcoming depletion of the roll, or any combinations thereof.

11. The dispenser according to claim 10 , wherein the control unit is configured to trigger actions to alert the service personnel of the upcoming depletion of the roll in a remote location.

12. The dispenser according to claim 1 , wherein more than one sensor is provided.

13. A roll of flexible sheet material comprising:

flexible sheet material; and

a core onto which the flexible sheet material is wound,

wherein one end portion of the flexible sheet material is glued to the core by a pickup glue,

wherein the pickup glue is detectable by a sensor,

wherein the pickup glue includes a detectable substance which is detectable by the sensor, and

wherein the detectable substance is a metallic substance, a magnetic substance, a conductive substance, a coloured substance, a fluorescent substance, or a radioactive substance, or any combinations thereof.

14. The roll of material according to claim 13 , wherein the pickup glue is at least partially present in the last windings of the flexible sheet material of the roll of material.

15. The roll of material according to claim 13 , wherein the pickup glue is at least partially present in the last 45 cm of the flexible sheet material of the roll of material.