APPLICATION NOZZLE

Abstract

An application nozzle for applying a viscous material to workpieces includes a nozzle body and an application duct for the viscous material, the duct extending inside the nozzle body from a material inlet opening to a material outlet opening. At least one filler element is located in the application duct, which filler element constricts the cross-section of the application duct and extends from a first end remote from the material inlet opening to a second end at the material outlet opening.

Claims

1. An application nozzle for application of a viscous material to workpieces (44), having a nozzle body (12) and having an application channel (18) for the viscous material that extends in the nozzle body (12) from a material inlet opening (14) all the way to a material outlet opening (16), wherein at least one filler body (28) that narrows the cross-section of the application channel (18), extending from a first end (30) arranged at a distance from the material inlet opening (14) all the way to a second end (32) arranged at the material outlet opening (16) is arranged in the application channel (18); and wherein the at least one filler body (28) has a cross-section that increases in size from the first end (30) to the second end (32).

2. (canceled)

3. The application nozzle according to claim 1, wherein the cross-section of the at least one filler body (28) increases in size continuously from the first end (30) to the second end (32), at least in certain sections.

4. The application nozzle according to claim 1, wherein the at least one filler body (28) borders on the nozzle body (12) directly over its entire length.

5. The application nozzle according to claim 4, wherein the at least one filler body (28) is configured in one piece with the nozzle body (12).

6. The application nozzle according to claim 1, wherein two filler bodies (28) that are preferably identical in their dimensions are arranged in the application channel (18) at a distance from one another.

7. The application nozzle according to claim 1, wherein the cross-sections of the application channel (18) and of the filler body or bodies (28) add up to a semicircular surface at the material outlet opening (16).

8. The application nozzle according to claim 6, wherein the cross-section of the application channel (18) is M-shaped at the material outlet opening (16).

9. The application nozzle according to claim 6, wherein the two filler bodies (28) are arranged with mirror symmetry with reference to a center plane (34).

10. The application nozzle according to claim 1, wherein the application channel (18) is angled away between the material inlet opening (14) and the material outlet opening (16), in such a manner that a longitudinal center axis (22) of an initial section (20) proceeding from the material inlet opening (14) and a longitudinal center axis (26) of an end section (24) of the application channel (18) that extends toward the material outlet opening (16) enclose an acute or right angle, in particular an angle between 30 and 60.

11. The application nozzle according to claim 1, wherein at least one heating element for heating the viscous material is arranged in the application channel (18).

12. The application nozzle according to claim 11, wherein the at least one heating element is arranged in the at least one filler body (28).

13. The application nozzle according to claim 1, wherein at least one feed line for the application of an additive, which line opens into the material outlet opening (16) or into the application channel (18), is arranged in the application channel (18).

14. The application nozzle according to claim 13, wherein the at least one feed line runs through the at least one filler body (28).

15. An application nozzle for application of a viscous material to workpieces (44), having a nozzle body (12) and having an application channel (18) for the viscous material that extends in the nozzle body (12) from a material inlet opening (14) all the way to a material outlet opening (16), wherein at least one heating element for heating the viscous material is arranged in the application channel (18).

16. An application nozzle for application of a viscous material to workpieces (44), having a nozzle body (12) and having an application channel (18) for the viscous material that extends in the nozzle body (12) from a material inlet opening (14) all the way to a material outlet opening (16), wherein at least one feed line for application of an additive, which opens into the material outlet opening (16) or into the application channel (18), is arranged in the application channel (18).

17. The application nozzle according to claim 11, wherein the at least one heating element and/or the at least one feed line is releasably connected with the nozzle body (12).

18. A method for application of a viscous material to workpieces (44), using an application nozzle (10) that has a nozzle body (12), through which an application channel (18) extends all the way to a material outlet opening (16), according to claim 1, wherein the viscous material exits from the material outlet opening (16) in an application direction (36), wherein the application nozzle (10) is moved, during material application, in a movement direction (38) that is opposite to the application direction (36) or at least has a component that runs counter to the application direction (36).

19. The method according to claim 18 for application of a viscous material to workpieces (44), using an application nozzle (10), wherein the viscous material exits from the material outlet opening (16) in an application direction (36) and forms a material bead (40, 40, 140a, 140b, 140c, 140d) that extends in the application direction (36), and wherein the material bead (40, 40, 140a, 140b, 140c, 140d) has a number of cavities (42) that are open at the edge and extend in the application direction (36), which number corresponds to the number of filler bodies (28).

20. The method according to claim 19, wherein the material bead (40, 40, 140a, 140b, 140c, 140d) is applied with the cavity (42) facing the respective workpiece (44) or with the cavities (42) facing the respective workpiece (44), respectively.

21. The method according to claim 19, wherein the material bead (40, 40, 140a, 140b, 140c, 140d) is applied in particular in a fold (46) of the respective workpiece (44), with the cavity (42) facing away from the workpiece (44) or with the cavities (42) facing away from the workpiece (44), respectively.

22. (canceled)

Description

[0013] In the following, the invention will be explained in greater detail using an exemplary embodiment shown schematically in the drawing. The figures show:

[0014] FIG. 1a, 1b an application nozzle in a front view and in a side view;

[0015] FIG. 1c the detail A from FIG. 1a;

[0016] FIG. 2a, 2b a material bead applied to a workpiece, in cross-section, when using a filler body or when using two filler bodies, respectively, and

[0017] FIGS. 3a to 3d four different shapes of a material bead in a fold, in cross-section.

[0018] The application nozzle 10 shown in the drawing has a nozzle body 12, in which an application channel 18 extends from a material inlet opening 14 all the way to a material outlet opening 16. The application nozzle 10 serves for application of viscous material to workpieces, wherein it is moved with reference to the workpieces, and wherein the viscous material is introduced into the application channel 18 under the impact of pressure, by way of the material inlet opening 14, and leaves this channel again at the material outlet opening 16. In this regard, the application channel 18 has an initial section 20 that extends from the material inlet opening 14, which section has a constant cross-section and extends parallel to a first longitudinal center axis 22. It furthermore has an end section 24 that ends at the material outlet opening 16, which in turn has a linear expanse parallel to a second longitudinal center axis 26, which axis runs at an acute angle to the first longitudinal center axis 22. The cross-section of the application channel 18 decreases from the initial section 20 to the end section 24. The application channel 18 is curved between the initial section 20 and the end section 24.

[0019] Two filler bodies 28 are arranged in the application channel 18, which bodies are configured in one piece with the nozzle body 12 and narrow its cross-section in the end section 24. Each of the filler bodies 28 extends from a first end 30, which is arranged at a distance from the material inlet opening 14 as well as at a distance from the material outlet opening 16, all the way to a second end 32, which is arranged at the material outlet opening 16. The two filler bodies 28 have identical dimensions and are arranged at a distance next to one another and running parallel to one another. They are furthermore arranged symmetrically with reference to a center plane 34, which stands perpendicular to the drawing plane of FIG. 1a, c, and runs parallel to the drawing plane of FIG. 1b, and which is a symmetry axis of the application nozzle 10. The cross-section of the filler bodies 28 increases continuously from the first end 30 to the second end 32. At the material outlet opening 16, the cross-sections of the application channel 18 and of the filler bodies 18 add up to a semicircular surface.

[0020] The application nozzle 10 is particularly suitable for application of a material bead to a workpiece, wherein the application nozzle 10 is moved in dragging manner. This means that the material exits from the material outlet opening 16 in an application direction 36, while the application nozzle 10 is simultaneously moved in a movement direction 38 that is opposite to the application direction 36 or at least has a directional component that runs counter to the application direction 36. A material bead 40 that is essentially M-shaped in cross-section exits from the material outlet opening 16, wherein the tips of the M are rounded off, and the bead has two cavities 42 that approximately correspond to the filler bodies 28 in cross-section. As shown in FIG. 2a, the material bead can be applied to a workpiece 44 in such a manner that the cavities 42 are enclosed between the viscous material and the workpiece 44.

[0021] Fundamentally, the application nozzle 10 can also be implemented with just one filler body in the application channel 18 extending all the way to the material outlet opening 16, instead of with two filler bodies 28 that run parallel to one another. As an example, FIG. 2b shows a corresponding material bead 40 in cross-section, which bead encloses only one cavity 42 with the workpiece 44. Such a material bead 40 can be applied, in particular, if the danger exists that it will slip away in one direction on the workpiece 44. It has a thicker main region 40a and a supporting region 40b that prevents slippage.

[0022] FIG. 3a to d show schematic examples of use, in which the material bead 140a to 140d is applied to respective workpiece 44 in the opposite direction, in other words with cavities 42 facing away from the workpiece 44. In this regard, FIG. 3a to c show three different exemplary embodiments, in which a filler body 28 is used for forming a cavity 42, in each instance, while FIG. 3d shows an exemplary embodiment in which two filler bodies 28 are used for forming two cavities 42, in accordance with the application nozzle 10 according to FIG. 1a to c. The geometry of the material bead 140a to 140d can be influenced and adapted to the respective conditions and requirements by means of a suitable selection of the cross-section of the filler bodies 28. In FIG. 3a to d, the material bead 140a to 140d fills a fold 46, in each instance.

[0023] According to further developments not shown in the drawing, the filler bodies 28 can take on additional functions. Thus, it is possible that an electrically heatable heating cartridge is used for heating the viscous material in the end section 24 in at least one of the filler bodies, which cartridge is accommodated there in fixed or removable manner. Likewise, it is possible that a feed line for a particularly abrasive additive extends through at least one of the filler bodies 28, which line ends either in the end section 24 or in the material outlet opening 16. The feed line can also be firmly integrated into the respective filler body 28 or removably arranged in it, so that it can be replaced in case of wear.

[0024] In summary, the following should be stated: The invention relates to an application nozzle 10 for application of a viscous material to workpieces 44, having a nozzle body 12 and having an application channel 18 for the viscous material that extends in the nozzle body 12 from a material inlet opening 14 all the way to a material outlet opening 16. It is provided, according to the invention, that at least one filler body 28 that narrows the cross-section of the application channel 18, extending from a first end 30 arranged at a distance from the material inlet opening 14 all the way to a second end 32 arranged at the material outlet opening 16 is arranged in the application channel 18.