METHOD FOR SPRAYING A LIQUID BINDER AND GLUE DEVICE

Description

[0001] The invention relates to a method for spraying a liquid binder using an atomizing medium, wherein the binder comprises a binder component and a hardener component, with a multi-component nozzle having a nozzle body, wherein the binder and the atomizing medium are supplied to the nozzle body and sprayed through at least one outlet nozzle opening. Preferably, the invention relates to a method for spraying free-flowing particles with a liquid binder, e.g., a method for coating the free-flowing particles with adhesive.

[0002] The multi-component nozzle used in such a process is preferably designed as a two-component nozzle for atomizing a liquid binder with the aid of an atomizing medium. Particularly preferred is a multi-component nozzle, e.g., a two-component nozzle, for the gluing of free-flowing particles, e.g., in the wood-based panel industry, so that the gluing of lignocellulosic particles, e.g., wood fibers, wood chips, or the like, is the primary focus. The atomizing medium is preferably air, especially compressed air. Alternatively, another gas or a vapor, e.g., water vapor, or a vapor-air mixture can also be used as the atomizing medium. In the production of wood-based panels, e.g., particleboard, fiberboard, or the like, particles, e.g., wood chips, wood fibers, or the like, are provided as the starting material.The particles are produced and then coated with a liquid binder. From the coated particles, for example, a litter mat is then produced, which is pressed into a wood-based panel in a press. The presses can be either intermittent or continuous-running. The coating of the fibers is of particular importance in the production of wood-based panels. This is because the properties of the manufactured wood-based panel, such as its transverse tensile strength, depend crucially on the quality of the coating, for example, on the amount of adhesive used.

[0003] The adhesives or liquid binders or binder components used in the invention include, for example, isocyanates, melamine resin formaldehyde (resins), urea-formaldehyde (resins), urea-formaldehyde (resins), melamine resins, phenolic resins, or other resins, e.g., based on polyamines or tannins. In practice, these binders or binder components are generally processed with a hardener or hardener component, which is a component or adhesive ingredient that causes cross-linking of the adhesive / binder. For example, the urea-formaldehyde binders used may be solutions for lowering the pH value to initiate polycondensation reactions, such as ammonium sulfate, ammonium nitrate, or ammonium chloride. Different hardeners, which can also be called activators, are used for the various types of binders.

[0004] Various gluing devices can be used for the application process, each equipped with one or more multi-component nozzles, particularly two-component nozzles, for atomizing the adhesive using a spray medium. These can be, for example, devices for blow-line gluing. Alternatively, devices for mixer gluing are used. Furthermore, such a device can also be designed for drop-chute gluing.

[0005] For example, DE 102 47 412 C5 describes a system for the drop-shaft gluing of fibers for the production of fiberboard.

[0006] DE 10 2009 057 916 B4 describes a device and a method for continuously mixing fibers with a binder for the production of fiberboards, in which one or more rotating mixer shafts with mixing tools attached to them are arranged in a drum-like mixing chamber, wherein the mixing tools mix the fibers with a binder and convey them through the mixing chamber in a conveying direction.

[0007] Alternatively, for example, DE 10 2011 103 326 B4 describes a blow-line gluing process in which the particles to be glued are transported through a blow line to which several nozzles are connected, each leading into the blow line. These nozzles are designed as multi-component nozzles, e.g., two-component nozzles for vapor atomization. At least one glue supply line and one vapor supply line are connected to each two-component nozzle. Each glue supply line incorporates at least one glue valve and a flow meter. The glue valves and the flow meter are connected to at least one control and / or regulating device, allowing the flow rate for each glue supply line to be controlled or regulated separately.

[0008] The various known methods of gluing have proven their worth in practice. The same applies to the nozzles used in such gluing devices and processes. In practice, these are equipped, for example, with a central, axially movable needle that performs both a sealing and a cleaning function.

[0009] Based on this, DE 10 2019 110 188 A1 describes a multi-component nozzle, in particular a two-component nozzle, in which the nozzle needle, which is already present and can be moved longitudinally, can not only be used as a closure and cleaning needle, but can also be used for controlling or regulating the flow rate of the liquid, in particular the glue, so that the liquid output can be varied by moving the nozzle needle in the longitudinal direction.

[0010] In a process of the type described above, binders are typically used that consist of a binder component and a hardener component. Often, the binder component itself is referred to as the binder, and the hardener component as the hardener. Mixing the binder component with the hardener makes the binder (e.g., the glue) reactive. As already mentioned, the hardener or hardener component is a component or binder portion that causes cross-linking of the binder. Consequently, a two-component reaction system can be implemented. The hardener can, for example, initiate a polymerization reaction or a polycondensation reaction, e.g., by lowering the pH value. Furthermore, the hardeners can act as activators for the initiation of radical chain polymerization.

[0011] In practice, it is possible to supply the two-component nozzles with the "ready-made" binder, which contains both the binder and hardener components. This means the binder component is mixed with the hardener before being fed to the nozzle. The disadvantage of this method is that the reactive adhesive can lead to clogging, hardening, and blockages in the adhesive distribution system and in the nozzles.

[0012] For this reason, in practice, the hardener (independent of the binder component) is alternatively added directly into the gluing chamber of a gluing device via a separate nozzle. For example, in addition to several binder nozzles, a separate hardener nozzle can be provided in the gluing chamber, which sprays the glue separately into the chamber. This reliably prevents glue hardening in the feeding systems and in the two-component nozzles for the glue. The disadvantage is that glue consumption increases, since the hardener is no longer mixed directly with the glue but is only added in the gluing chamber via a separate nozzle. Furthermore, a uniform distribution of the hardener onto the particles to be glued, e.g., the shavings or fibers, cannot be achieved to the desired extent.

[0013] Furthermore, DE 10 2013 104 652 A1, which discloses the preamble of claim 1, describes a device and a method for bonding chips in a mixing device or in a transport tube, wherein a nozzle for supplying a binder is connected to the mixing device or the transport tube. The binder can be mixed with steam in a mixing chamber of the nozzle to form a steam-binder mixture, and the steam-binder mixture is dissolved in a transport tube or a mixing device through an opening and brought into contact with the fibers and / or the chips. The hardener for the binder can be metered into the steam line or into the mixing chamber.

[0014] Overall, there is a need to provide measures that, on the one hand, prevent sticking, hardening, and blockages in the system, and on the other hand, achieve low binder consumption and preferably ensure flawless or homogeneous bonding of the particles. This is where the invention comes in.

[0015] The invention is based on the objective of creating a method by which a liquid binder can be sprayed economically without causing functional impairments to the components involved, e.g. due to sticking or hardening of the binder.

[0016] To solve this problem, the invention teaches a method with the features of claim 1. It is provided that the hardener component or the hardener itself is mixed with the binder component only at or after exiting the nozzle opening (outside the nozzle body). This can be achieved particularly preferably by first feeding the hardener component to or mixing it with the atomizing medium, and then spraying the binder component using the atomizing medium containing the hardener.

[0017] The invention is based on the understanding that when using two-component binders or binders processed with a hardener / activator, it is advantageous to spray both the binder component and the hardener with the same nozzle, preferably a two-component nozzle. This reduces adhesive consumption and ensures a uniform distribution of the binder and hardener. However, the supply via the same nozzle is not achieved by feeding a pre-mixed adhesive or binder-hardener mixture to the nozzle. Instead, the binder component and the hardener component are fed separately to the same two-component nozzle, such that mixing only occurs at or after exiting the nozzle opening and consequently outside the nozzle body.In this way, sticking, hardening, and blockages are avoided throughout the entire adhesive distribution system, including in the nozzles. Interestingly, this method allows the use of multi-component nozzles known from the prior art, such as two-component nozzles, including those described in DE 10 2019 110 188 A1.

[0018] The nozzle body of a multi-component nozzle has at least one first inlet for the binder or for the binder component and a second inlet for the atomizing medium. In the prior art, a binder line for supplying the (premixed) liquid binder can be connected to the first inlet, and a second line for the atomizing medium is connected to the second inlet. According to the invention, only the binder component (without hardener) is supplied via the first inlet, not the (premixed) binder. The hardener component is preferably supplied together with the atomizing medium via the second inlet, for example, via a supply line connected to the second inlet. For this purpose, the second inlet can also be modified in a suitable manner so that the hardener component is mixed with the atomizing medium in the region of the second inlet, for example, by...The second inlet can be connected to both a line for the atomizing medium and a line for the hardener component. The hardener component can also be mixed with the atomizing medium in the supply line. It is always advantageous for the hardener component to be introduced into the nozzle body independently of the binder component, e.g., together with the atomizing medium.

[0019] In an alternative embodiment, the hardener component can be supplied independently of the atomizing medium, for example, via a separate line that can be connected to a third port on the nozzle body. In this embodiment, the hardener component can be mixed with the atomizing medium within the nozzle body, or it can be mixed with the binder component, and this binder mixture can then be sprayed with the atomizing medium in the conventional manner. In this embodiment as well, no premixed binder is supplied to the nozzle.

[0020] Finally, another alternative involves supplying the binder component, the hardener component, and the atomizing medium to the nozzle body separately, thus eliminating the need for mixing within the nozzle body. This allows the hardener component, the binder component, and the atomizing medium to exit and be sprayed through different nozzle openings of the same nozzle. This can be achieved, for example, with a modified sizing nozzle designed as a three-component nozzle, in which the hardener component, the binder component, and the atomizing medium are supplied separately and guided through three separate channels within the nozzle body.

[0021] However, as described, conventional sizing nozzles are particularly preferred, and the hardener component is mixed with the atomizing medium within the supply line. Especially with sizing nozzles where the atomizing medium only comes into contact with the binder at the nozzle exit, this ensures that the binder component only meets the hardener component outside the nozzle in the sizing chamber during the atomization process. This reliably prevents blockages, and the hardener is mixed into the adhesive by the atomizing medium (e.g., compressed air). The hardener can therefore be added directly at the tip of the two-component nozzle together with the atomizing medium. Since separate hardener nozzles are not required, the atomization / sizing process can be particularly economical, and a precise, statistical distribution of the hardener can be achieved.

[0022] The invention also relates to a gluing device for coating free-flowing particles, in particular lignocellulosic particles, comprising a gluing chamber into which the particles to be glued can be inserted or through which they can be passed, and one or more multi-component nozzles, e.g., two-component nozzles, arranged in or on the gluing chamber, with which the particles in the gluing chamber are sprayed with a liquid binder. Such a gluing device can be a gluing mixing device with a drum-shaped gluing chamber and one or more mixing tools rotating within the gluing chamber. Alternatively, the gluing device can be designed as a blow-line gluing device, with a blow line forming the gluing chamber to which the multi-component nozzles are connected.Finally, the gluing device can also be designed as a drop-chute gluing device, with a gluing chamber designed as a drop chute and with several multi-component nozzles arranged on or above the drop chute.

[0023] Each nozzle has a nozzle body with a first inlet and a second inlet, as well as at least one outlet-side nozzle opening. A first line for the binder component is connected to the first inlet, and a second line for the atomizing medium is connected to the second inlet. According to the invention, the gluing device has a hardener line (e.g., as a third line) for supplying the hardener component. This hardener line can also be connected to the second inlet of the nozzle body. Alternatively, the hardener line, or third line, can also be connected to the second line, so that the hardener component is first mixed with the atomizing medium in the second line via the third line.Alternatively, the supply can also be via a third inlet in the nozzle body; that is, a nozzle with a third inlet for the hardener component can be used, with the third line for the hardener component connected to this third inlet. Overall, this gluing device is therefore designed such that the hardener component is only mixed with the binder component at or after exiting the nozzle opening (e.g., outside the nozzle body).

[0024] The gluing device preferably has not just a single multi-component nozzle, but multiple multi-component nozzles connected to or projecting into the gluing chamber. Consequently, several hardener lines are preferably provided, each assigned to a specific nozzle. The gluing device includes a distribution device with which the hardener can be distributed to the individual hardener lines in a desired distribution, e.g., uniformly. This distribution device can be, for example, a simple (static) multi-way distributor (e.g., a distributor block or a diverter valve) that distributes the hardener or hardener solution to the individual lines.

[0025] To improve the accuracy of the distribution, the distribution system can also include multiple controllable or adjustable hardener valves, so that the hardener solution is distributed evenly or in another predefined manner to the individual lines and thus to the individual nozzles via these valves, e.g., control valves or regulating valves. Optionally, flow meters can also be integrated into the hardener lines, e.g., into each individual hardener line, so that it is then possible to control or regulate the amount of hardener in each individual hardener line.

[0026] The amount of binder component sprayed can be controlled or regulated in various ways. For example, a control or regulating valve or a flow meter can be integrated into the binder line to control or regulate the amount of binder component supplied to the nozzle. Alternatively, nozzles can be used where the amount of binder ejected within the nozzle is controlled, for example, by a nozzle needle. See the figure description for further details. Even with such a system, it is advantageous to integrate a flow meter into the binder line to control or regulate the nozzle needle.

[0027] The gluing device according to the invention can in principle be equipped with multi-component nozzles, e.g. two-component nozzles, which are known from the prior art.

[0028] The disclosure also relates to a modified multi-component nozzle, e.g., a two-component or three-component nozzle, which can be used for the inventive method or within the inventive gluing device. Such a multi-component nozzle can, in addition to a first inlet and a second inlet, have a third inlet for the hardener component, so that the binder component on the one hand and the hardener component on the other are supplied to the nozzle body independently of one another. The hardener component can be mixed with the binder component within the nozzle body. Preferably, however, the third inlet is configured such that the hardener component is mixed with the atomizing medium within the nozzle body. Thus, the nozzle body can have a first channel for the binder component and a second channel for the atomizing medium.Both the second inlet for the atomizing medium and the third inlet for the hardener component are connected to this second channel, so that the hardener component is mixed with the atomizing medium within the second channel. Alternatively, the nozzle body can also have a third channel for the hardener component, so that the binder component, the hardener component, and the atomizing medium are guided in separate channels within the nozzle body. The hardener component can be mixed with the binder component and / or the atomizing medium at the nozzle opening.

[0029] The invention will now be explained in more detail with reference to the drawings, which merely illustrate exemplary embodiments. They show Fig. 1 shows a multi-component nozzle for carrying out the method according to the invention and Fig. 2 shows a schematically simplified gluing device or gluing system according to the invention.

[0030] In Fig. 1 A possible embodiment of a multi-component nozzle D for atomizing or spraying a liquid binder using an atomizing medium is shown, wherein this multi-component nozzle can be used by way of example in a method according to the invention or can be part of a gluing device according to the invention, which can be used by way of example in Fig. 2 is shown.

[0031] The multi-component nozzle D is designed as a two-component nozzle, with which a liquid binder, e.g., a glue or the like, is sprayed for bonding lignocellulosic particles during the production of wood-based panels, using an atomizing medium. The atomizing medium can be, for example, air (compressed air) or alternatively another gaseous medium, e.g., steam.

[0032] The two-component nozzle D has a nozzle body 1, wherein the binder and the atomizing medium are supplied to the nozzle body and sprayed via at least one outlet nozzle opening 8, 9. For this purpose, the nozzle body has a first inlet 10, which is connected to a first channel 6, and also a second inlet 11, which is connected to a second channel 7. In the prior art, a hardener could be supplied via a different, separate nozzle, so that a binder component without hardener was supplied via the first inlet 10. Alternatively, in the prior art, it was possible to provide a (premixed) binder via the first inlet 10. In all cases, the atomizing medium is supplied via the inlet 11, with the binder reaching the area of ​​the outlet opening 8 via the first channel 6.The atomizing medium enters the area of ​​the outlet opening 9 via the second channel 7, which surrounds the outlet opening 8 in a ring shape, so that the binder is sprayed with the help of the atomizing medium.

[0033] In the illustrated embodiment, the nozzle body 1 has an outer tube 2, an inner tube 3 arranged concentrically in the outer tube 2, and a nozzle needle 4 arranged concentrically in the inner tube so as to be displaceable in an (axial) longitudinal direction L. A drive 5 is provided for displacing the nozzle needle 4; in this embodiment, the drive is a pneumatic drive.

[0034] Between the nozzle needle 4 and the inner tube 3, an inner annular channel is provided as the first channel 6, e.g., for a liquid. Between the outer tube 2 and the inner tube 3, an outer annular channel 7 is provided as the second channel for the atomizing medium. The inner tube 3 has the end outlet opening 8 for the liquid, which connects to the inner annular channel 6. The two-fluid nozzle also has the annular opening 9 at its end for the atomizing medium, so that an annular atomizing jet impinges on the concentric liquid jet around the outside and disperses / sprays the liquid.

[0035] Instead of a premixed binder (consisting of a binder component and a hardener component) being supplied via the inlet opening 10, the invention provides that the hardener component H is supplied independently of the binder component B (in the same nozzle), i.e., the hardener component H is mixed with the binder component B only upon or after exiting the nozzle body. For this purpose, the hardener component H is first supplied to the atomizing medium Z, so that the binder component B is sprayed by means of the atomizing medium Z containing the hardener component H.

[0036] According to the invention, the following occurs during the in Fig. 1 The illustrated two-component nozzle D supplies the binder component B (without hardener) via inlet 10. The atomizing medium Z, together with the hardener component H, is supplied via inlet 11. In this embodiment, the hardener H only comes into contact with the binder component B directly at the nozzle tip or after exiting the nozzle tip outside the nozzle. The hardener H is therefore added with the atomizing medium Z, and the binder only comes into contact with the hardener component H outside the nozzle in the sizing chamber during the atomization process. This eliminates the need for a separate hardener supply in a separate nozzle and prevents blockages and contamination, as hardening of the binder within the nozzle D is avoided.

[0037] In Fig. 1 It is evident that an inlet nozzle 10a and / or an inlet line is connected to inlet 10, and an inlet nozzle 11a and / or a corresponding inlet line is connected to inlet 11. In one possible embodiment, the binder component B is supplied via line 10b connected to nozzle 10a, and both the atomizing medium Z and the hardener component H are supplied via line 11b connected to nozzle 11a.

[0038] This results, for example, from the Fig. 2 , which greatly simplifies a possible embodiment of a gluing device or system according to the invention.

[0039] The gluing device has a gluing chamber K into which the particles to be glued can be inserted or through which they can be passed. This chamber can be, for example, a blow line, a mixer, or a drop chute. In the illustrated embodiment, six multi-component nozzles D are provided, each with its nozzle tip extending into the gluing chamber K to spray the particles with the binder within the chamber. Each nozzle D is connected to a first line 10b for the binder component B and a second line 11b for the atomizing medium Z. Furthermore, a hardener line 22 is provided as an additional line through which the hardener H is supplied. Fig. 2 It is evident that the hardener line 22 leads into the second line 11b, through which the atomizing medium Z is supplied. This means that the hardener H, together with the atomizing medium Z, enters the area of ​​the Fig. 1 the connection stub 11a shown and the inlet opening 11.

[0040] In the illustrated embodiment, the amount of binder to be sprayed is controlled or regulated by the special design of the nozzle D, in conjunction with flow measuring devices 24 that are integrated into the binder lines 10b. This will be discussed in more detail below.

[0041] In the illustrated embodiment, the hardener H is distributed via a distribution device 25, which is only indicated, and to which the hardener lines 22 are connected. In the simplest case, this can be a static distribution device or a distribution block, through which the hardener flows from the reservoir into the individual lines and thus to the individual nozzles in fixed, predetermined quantities. Optionally, however, the distribution device 25 can also include individual control or regulating valves for the individual hardener lines 22, in which case a flow meter is preferably integrated into each of the hardener lines 22. This option is not shown in the figures.

[0042] The following is explained as an example of the design of the nozzles D: In the Fig. 1 and 2 The figure shows that the nozzles D are each provided with a nozzle needle 4 that can be moved along the longitudinal direction L. Fig. 1 The nozzle is shown in the open operating position for spraying. With the aid of the drive 5, the nozzle can be moved in the closing direction S into the closed position, so that the nozzle needle 4 with its needle end 16 is retracted into the outlet opening 8 in such a way that an outer closing surface 17, circumferentially running around the outside of the nozzle needle 4, rests against a corresponding inner closing surface 18 in the inner tube. This closed position is in Fig. 1 Indicated by a dash.

[0043] Additionally, a control surface 20, formed by a control cone 19 and inclined at an angle to the nozzle axis or needle axis A, can be provided on the nozzle needle 4. In the exemplary embodiment, this control cone is arranged on the side of the nozzle needle facing away from the needle end 16, with respect to the aforementioned closing surface 17; that is, the closing surface 17 is located between the control cone 19 and the needle end 16. By displacing the nozzle needle 4 along the longitudinal direction L, the control surface 20 interacts with a corresponding inner surface 21 of the inner annular channel 6 in such a way that the flow rate through the second annular channel 6 is changed.

[0044] In the embodiment shown in the figure, the control cone 19 and the inner surface 21 are oriented such that the displacement direction of the nozzle needle 4 for closing the nozzle, and consequently the closing direction S, is opposite to the displacement direction R for reducing the flow. As already mentioned, the nozzle needle 4 of the nozzle can be pneumatically actuated via the pneumatic actuator 5, which has a piston 13 connected to the nozzle needle 4 and guided in a cylinder 14. The cylinder 14, and thus the piston 13, can be pressurized with a pressure medium P, e.g., compressed air (control air), via the additionally provided compressed air connection 12a and the compressed air opening 12. A compressed air line, serving as the control air line 32, is connected to the compressed air connection 12a. Fig. 2 is shown. The in Fig. 2 The control air line 32 shown must therefore not be confused with the compressed air line 11b for the atomizing medium Z.

[0045] The amount of binder sprayed is controlled or regulated in the nozzles shown – as already mentioned – by controlling the nozzle needle 4. For this purpose, the flow meter 24 is connected to a valve 26, which is integrated into the control air line 32, so that the control air 32, and thus the position of the nozzle needle, can be controlled or regulated depending on the measurement results of the flow meter 24. Optionally, the flow meter 24 can also be connected to a valve 27, which is integrated into the line 11b for the atomizing medium Z, so that the supply of the atomizing medium can also be controlled or regulated depending on the measurement results of the flow meter 24. The valves 26 and / or 27 are controllable valves, e.g., proportional valves.

[0046] Furthermore, in Fig. 2 Additionally, various valves are shown, which, however, generally only need to be designed as shut-off valves to disconnect individual parts of the system for maintenance purposes. For example, valves 28a, 28b, and 28c are integrated at various points in the binder supply. Shut-off valves 29 can also be integrated into the hardener supply. Finally, in Fig. 2 An additional cleaning function is shown as an example, allowing a cleaning medium M to be supplied to the nozzles via a cleaning line 30. This cleaning line 30 connects to the binder lines 10b via three-way valves 31.

[0047] The in Fig. 1 The nozzle shown is known in its basic design from DE 10 2019 110 188 A1, so that this embodiment and the other embodiments described in this document can be used. The essential feature of the invention is that, in this embodiment, not only the atomizing medium Z but also the hardener H is supplied via the inlet opening 11, independently of the binder component B, which is supplied via the inlet 10. In this context, Fig. 1 A nozzle known from DE 10 2019 110 188 A1 with "external mixing" is shown, i.e., the atomizing medium and the binder only come into contact outside the nozzle, immediately after the nozzle tip. However, it is also possible to use the variants known from DE 10 2019 110 188 A1 with internal mixing, in which the atomizing medium comes into contact with the binder in the area of ​​the nozzle tip immediately before exiting and is then sprayed together with the binder from a common opening.

[0048] The inventive method can also be implemented with modified multi-component nozzles, which are used, for example, in the Fig. 2 The depicted system can be used. In particular, it is possible to equip the nozzle body 1 with an additional hardener inlet, which can, for example, be directly connected to the channel for the atomizing medium, so that the hardener H enters the corresponding nozzle channel for the atomizing medium within the nozzle. This is shown in Fig. 1 Not shown. Alternatively, there is also the possibility of implementing an additional, third channel for the hardener as a separate hardener channel in the nozzle. This is also not shown in the figures.

Claims

1. Method of spraying a liquid binding agent with the aid of an atomising medium (Z), wherein the binding agent is composed of a binding agent component (B) and a hardener component (H), with a multi-component nozzle (D) that comprises a nozzle body (1), wherein the binding agent and the atomising medium (Z) are supplied to the nozzle body (1) and sprayed via at least one nozzle opening (8, 9) on the outlet side, characterised in that the hardener component (H) is only mixed with the binding agent component (B) during or after emerging from the nozzle opening (8, 9).

2. Method according to claim 1, characterised in that the hardener component (H) is initially supplied to the atomisation medium (Z) and in that the binding agent component (B) is sprayed by way of the atomisation medium (Z) mixed with the hardener component.

3. Method according to claim 1 or 2, wherein the nozzle body (1) comprises a first inlet (10) for the binding agent component (B) and a second inlet (11) for the atomisation medium (Z), characterised in that the hardener component (H) is supplied to the atomisation medium (Z) in the nozzle body (1) or in or at the second inlet (11) or in a supply conduit (11b) connected to the inlet (11).

4. Adhesive application device for applying adhesive to spreadable particles, with an adhesive application chamber (K) into which the particles to which adhesive is to be applied can be introduced or through which the particles to which adhesive is to be applied can be passed, and with one or more multi-component nozzles (D) arranged in or on the adhesive application chamber (K) with which the particles in the adhesive application chamber (K) are sprayable with a liquid binding agent in accordance with a method according to any one of claims 1 to 3, wherein the nozzles (D) each comprise a nozzle body (1) with a first inlet (10) and a second inlet (11) and at least one nozzle opening (8, 9) on the outlet side, wherein a first conduit (10b) for the binding agent component (B) is connected to the first inlet (10) wherein a second conduit (11b) for the atomisation medium (Z) is connected to the second inlet (11) and wherein an additional hardener conduit (22) for the hardener component (H) is connected to the second inlet (11) or to the second conduit (11b) or to a third inlet in the nozzle body (1) so that the hardener component (H) is only mixable with the binding agent component (B) during or after emerging from the nozzle body.

5. Adhesive application device according claim 4 with a plurality of multi-component nozzles (D), characterised in that the hardener conduit (22) is connected to a hardener supply or a hardener reservoir via a distribution with which the supplied hardener (H) can be distributed to the conduits (22), e.g. with even quantities or throughflows.

6. Adhesive application device according to claim 5, characterised in that the distributor device is formed of a plurality of controllable or regulable hardener valves (25).

7. Adhesive application device according to claim 5, characterised in that the distribution device is designed as a central distributor unit with fixed or adjustable valves.

8. Adhesive application device according to any one of claims 4 to 7, characterised in that the nozzle body (11) of the multi-substance nozzle (D) comprises a third inlet for a hardener component (H).

9. Adhesive application device according to claim 8, wherein arranged within the nozzle body (1) is a first channel (6) for the binding agent component (B) connected to the first inlet (10), and a second channel (7) for the atomisation medium (Z) connected to the second inlet (11), characterised in that the third inlet is in connection with the first channel (6) or with the second channel (7), or in that arranged within the nozzle body (1) is a third channel for the hardener component (H) which is connected to the third inlet.