Device for Applying a Hot-Melt to a Web of Material

Abstract

The invention relates to a device for applying a hot-melt to a web of material. The device includes a driven roller and a nozzle with a nozzle channel arranged adjacent the driven roller for supplying a hot melt through the nozzle channel to the surface of the roller. The invention also relates to a combination of a device according to the invention and a web of material, which web of material is guided along the driven roller and wherein the nozzle channel exits in front of the nip of the web of material and the driven roller.

Claims

1. A device for applying a hot-melt to a web of material, which device comprises: a driven roller; and a nozzle with a nozzle channel arranged adjacent the driven roller for supplying a hot-melt through the nozzle channel to the surface of the roller; wherein the nozzle channel is in flow direction, at least over a part of the circumference of the roller, parallel to the surface of the roller.

2. The device according to claim 1, wherein the flow direction is tangential to the circumference of the roller.

3. The device according to claim 1, wherein the nozzle channel is at least partially bounded by a part of the surface of the roller.

4. The device according to claim 3, wherein the nozzle channel is bounded by a part of the surface of the roller, in flow direction, over at least a twentieth of the circumference of the roller.

5. The device according to claim 1, wherein the nozzle channel is provided in transverse direction, perpendicular to the flow direction, at least one partition wall to apply the hot-melt in tracks to the web of material.

6. The device according to claim 5, wherein the at least one partition wall is provided by an elevation arranged in a nozzle channel wall.

7. The device according to claim 6, wherein the elevation is virtually in contact with the opposite wall of the nozzle channel.

8. The device according to claim 1, wherein the nozzle channel is in flow direction, over at least a tenth of the circumference of the roller, parallel to the roller.

9. A combination of a device according to claim 1 and a web of material, which web of material is guided along the driven roller and wherein the nozzle channel exits in front of the nip of the web of material and the driven roller.

10. The combination according to claim 9, wherein the distance between the exit of the nozzle and the nip of the web of material and the driven roller is less than 10 mm.

11. The device according to claim 2, wherein the nozzle channel is at least partially bounded by a part of the surface of the roller.

12. The device according to claim 11, wherein the nozzle channel is bounded by a part of the surface of the roller, in flow direction, over at least a twentieth of the circumference of the roller.

13. The device according to claim 2, wherein the nozzle channel is provided in transverse direction, perpendicular to the flow direction, at least one partition wall to apply the hot-melt in tracks to the web of material.

14. The device according to claim 3, wherein the nozzle channel is provided in transverse direction, perpendicular to the flow direction, at least one partition wall to apply the hot-melt in tracks to the web of material.

15. The device according to claim 4, wherein the nozzle channel is provided in transverse direction, perpendicular to the flow direction, at least one partition wall to apply the hot-melt in tracks to the web of material.

16. The device according to claim 11, wherein the nozzle channel is provided in transverse direction, perpendicular to the flow direction, at least one partition wall to apply the hot-melt in tracks to the web of material.

17. The device according to claim 12, wherein the nozzle channel is provided in transverse direction, perpendicular to the flow direction, at least one partition wall to apply the hot-melt in tracks to the web of material.

Description

[0026] These and other features of the invention will be elucidated in conjunction with the accompanying drawings.

[0027] FIG. 1 shows a side view of an embodiment of the device according to the invention.

[0028] FIG. 2 shows an enlarged view of part of FIG. 1.

[0029] FIG. 3 shows a perspective view of the embodiment of FIG. 1.

[0030] FIG. 1 shows a side view of an embodiment of the device 1 according to the invention. The device 1 has a driven roller 2 along which a web of material 3, such as a paper web, is guided.

[0031] Furthermore, a nozzle 4 is provided adjacent to the roller 2. The nozzle 4 has a nozzle channel 5 through which a fluid, such as a hot-melt, is supplied. The nozzle channel 5 has channel walls 6, 7. As the channel wall 6 is shorter than the channel wall 7, the nozzle channel 5 is also bounded by a part of the surface 8 of the roller 2 over a distance x of the circumference of the roller 2.

[0032] As can be seen in more detail in FIG. 2, the fluid exits at the tip 9 of the nozzle 4 and provides a layer 10 of fluid on the roller 2. As the fluid was already in contact with the roller 2 over the distance x and because the channel 5 has been parallel to the surface of the roller, a very even and thin layer 10 of fluid can be provided.

[0033] When the fluid layer 10 arrives at the nip 11 between the roller 2 and the web of material 3, the fluid layer 10 is transferred onto the web of material 3.

[0034] Preferably, the distance y between the tip 9 of the nozzle 4, where the fluid exits the nozzle 4, and the nip 11 is less than 10 mm. This ensures that the layer of fluid 10 is not disturbed between exiting the nozzle 4 and the nip 11, where the layer 10 is transferred onto the web of material 3.

[0035] FIG. 3 shows a perspective view of the embodiment 1 of FIG. 1. The nozzle channel 5 is provided in transverse direction, perpendicular to the flow direction F, with a number of elevations 12, which provide partition walls, such that tracks of hot-melt can be applied to the web of material 3.