DE2717539A1 - Cyanoacrylate adhesive dispenser - has dispensing valve disposed between adhesive supply line and discharge nozzle with compressed air supplied before nozzle - Google Patents

Abstract

Cyanoacrylate adhesive dispensing device has a controlled and adjustable dispensing valve which is disposed between the supply line and the dispensing nozzle. Valve has a housing whose interior is provided with compressed air supply duct terminating in a chamber formed by the discharge nozzle and outlet spigot integral with the housing. Metered quantities of adhesive can be dispensed accurately over prolonged periods.

Description

Device for dosing liquids

One-component adhesives The invention relates to a device for Dosing of liquid one-component adhesives, especially quasi-anaerobic adhesives and cyanoacrylate adhesives according to the preamble of claim 1.

Dosing devices for such adhesives are known. They work according to various principles, none of which, however, fully satisfy.

One type of device works with a reservoir from which the glue via a suction valve from a plunger pump sucked in is and supplied to the delivery point via a pressure hose and a pressure valve will. The volume is regulated by adjusting the stroke of the pump. The familiar construction has the disadvantage that in the more or less long pressure hose by the pressure build-up or pressure build-up, an expansion of the flexible hose material occurs, and this pressure only decreases after the end of the metering stroke, which leads to an uncontrolled Leads to dripping at the delivery point.

Another type of device uses the entire reservoir for the adhesive put under increased air pressure and pressed into the pressure hose Glue fed to the delivery point. The quantity control is either carried out by Overpressure valves or by time-controlled solenoid valves.

In this known construction, basically the same results Disadvantages as with the above-mentioned construction, provided that the valves do not are attached to the end of the pressure hose. However, this is because of the size of the valves seldom possible.

There is also a type of device known in which the adhesive sucked in by a valveless hose pump according to the peristaltic principle and is fed to the delivery point via the hose section on the pressure side. The volume control takes place either by specifying individual actuations via selectable counters or time switch, or by changing the hoses with different inner diameters. This known construction also has the disadvantages mentioned above in connection with the expansion of the flexible hose material. They also become brittle the elastomers used for the delivery hose often after a few hours of operation, whereby the dosing quantities become inaccurate.

The second alternative of this type of device is also the Volume adjustment by changing the hoses with different inner diameters cumbersome and time consuming.

There is also known a type of device in which the adhesive is sucked into smaller exchangeable containers by means of negative pressure, which then be pressurized again. The amount is regulated either by exchangeable Dispensing cannulas with different internal diameters, or by a time-controlled one Print job. In the case of this known construction, the one that takes place in each case is short-term Switching from "sucking" to "pressing" complicated. In addition, the storage container is with the dispensing tip is usually too big to get close to the dispensing point.

All known devices have the common disadvantage that in tight dimensioned dosing tips or cannulas quickly.

hardening adhesives, for example cyanoacrylate adhesives, during work breaks harden prematurely and make further dosing impossible.

The invention is based on the object of a metering device To create the type mentioned at the outset, which any dosage of such adhesive with reliably constant accuracy, which is so space-saving is designed so that each application site can be reached by the delivery cannula can, during which work breaks without impairing the function, in particular Dosing accuracy of the device are possible, and which with uncomplicated construction easy and with very little effort, especially with regard to its own weight the dosing device is to be operated.

This object is achieved by a device according to the claims.

The result is a device which at the end of supply lines for the glue and the blown air an extremely small dimensioned, easy to handle Has metering valve, in which the quantity control by exact valve control a valve made of metal parts. Between which the volume control causing valve part and the end of the delivery cannula are not elastomeric Hose sections, so that the dosage is and remains extremely precise. A Encrustation of the flow cross-sections during work breaks from drying glue may be left at the end of the delivery cannula by blowing off Glue drops prevented by means of the blown air valve line. Alternating coming into contact glue-carrying lines with conveying compressed air or blown compressed air is excluded.

It is particularly reliable despite keeping the air away from the Flow paths of the valve about any drying of the adhesive that takes place the embodiments of the device according to claims 2 and 3 prevented. By the polymerisation-inhibiting effect of the materials mentioned is one of them Drying-preventing effect of the construction according to the invention is additionally supported. The metal parts of the metering valve are preferably made of brass and are chemically nickel-plated using one of the known methods for electroless nickel-plating.

In the embodiment according to claim 4 there is a relation on the mechanics particularly simple, compared to the glue or a drying on of the adhesive insensitive construction of the closing mechanism of the valve and at the same time a cost-saving use of the compressed air source for both valve actuation as well as for the blowing process.

The embodiment according to claim 5 is realized in a constructive manner particularly simple way one in diameter extraordinarily small dimensioned outlet opening of the dispensing cannula.

The diameter of the outlet opening can be kept smaller here, as if the blown air valve line through the interior of the delivery cannula next to the Capillary tubes would be led to the outlet opening of the dispensing cannula. Preferred if the capillary tube is made of polytetrafluoroethylene, for example the one below plastic sold under the trademark Teflon.

The construction according to the claim is particularly simple and cost-saving 6, in which the membrane sealing the valve chamber is preferably from 0.2 to 0.3 mm thick polytetrafluoroethylene, for example that under the trademark Teflon sold compound, or polyimide, for example that under the trademark Capton, exists.

As particularly powerful and ideal for precise dosing the valve design according to claim 7 has proven to be suitable.

The embodiment works in a particularly simple, trouble-free and low-wear manner according to claim 8.

In the further development of the aforementioned embodiment according to Claim 9 results in a particularly elegant combination of the conveying effect the cleaning effect of the blown air.

There is an automatic, due to the fluid mechanics of the blown air flow paths Predetermined and adjustable timing of the glue delivery and the blown air delivery.

This construction is particularly suitable for dispensing smaller and the smallest quantities of glue, with a high frequency of individual dispensing can be.

In the embodiment according to claim 10 there is a special one easy adjustability of the dispensing processes of this construction, in particular the level of pressure and the duration of the pressure surge, the pressure loss in the throttle point, as well as the characteristics of the return spring for the influence represent important parameters of the processes.

Regardless of these variables, the per opening process of the valve amount of glue dispensed by setting the pre-pressure under which the glue is above the adhesive supply line is supplied, can be varied.

A very advantageous embodiment of the new device is called Claim 11. In this construction, the relatively small cross-sections are also Flow paths downstream of the closure elements of the valve, namely the bore of the dispensing nozzle and the cross-section of the dispensing cannula which narrows at the end with each glue dispensing process by a blown air stream of remaining glue cleaned. The accuracy of the dosage is not affected in any way, because those contained in the bore of the dispensing nozzle and the interior of the dispensing cannula Adhesive amount taken into account when measuring the individual amount to be dosed can be. In this embodiment, too, dripping is completely excluded. An even higher frequency of the dosages can be achieved than the one above discussed other embodiment.

The embodiment according to claim 12 shows a construction in which is the size of the stroke of the closure member of the valve when it is opened is adjustable in a particularly wide range. In particular, there is a relation the setting of the parameters is particularly variable and easy to control the automatic control according to the embodiment of claim 13, accordingly who already based of the other embodiments described automatic control. It should be noted that there is a risk of contact of air and glue in the valve chamber by blowing out the blown air too early the closure member does not exist because the injector effect when blowing in the Blown air into the bore of the delivery port, even with something left off the valve seat lifted closure member, no air can enter the valve chamber, rather Glue is sucked into the bore of the dispensing nozzle.

The embodiment according to claim 14 enables a practically universal Use of the new metering device because compressed air is in this low pressure range can be made available anywhere. This universal applicability is made possible by the handiness of the new device, among other things also due to the space-saving Line feed according to claim 15, supported.

The new device enables contactless and drip-free Wetting of adhesive surfaces in any position, both horizontal and vertical, the wetting or the release of adhesive both downwards and overhead can be done.

The invention is illustrated below with the aid of two exemplary embodiments described in more detail with reference to the drawings. These show in: Figure 1 a section through a first embodiment of the new metering device and figure 2 shows a section through another embodiment.

In Figure 1, the metering valve 10 consists of a main part 11> " which, as shown, can be composed of several parts, the supply lines 15c and 14a for the adhesive or the blown air, as well as a dispensing cannula 13. The Main part 11 has a dispensing nozzle 12 at its lower end, and in its The upper end is by means of a suitable connection glue line 15c and blown air supply line 14a led. The main part 11 has an overall slender cylindrical shape, see above that it is easy to use.

In the main part there are several separated by partitions separate cavities. The cavity closest to the dispensing nozzle 12 forms a valve space 15a for the adhesive. The one separated from it by a partition, The cavity above it forms one consisting of two compartments 17a and 17b Displacement. The one above it, separated from it by a partition Cavity (without reference number) contains further parts of the lifting device of the valve, which will be described in more detail.

The dispensing nozzle 12 has a bore 12a, which the valve chamber 15 a connects to the outside space in front of the dispensing nozzle 12. In the present case it connects the bore 12a does not directly connect the valve chamber 15a with the interior 13a of the dispensing cannula 13, but is through a tube 13b with the area outside the dispensing cannula 13 connected. The tube 13b, in the illustrated case a capillary tube, extends extends into the outlet opening 13c of the dispensing cannula 13. The interior 13a of the Delivery cannula 13, which is designed as a frustoconical hollow body and means Frictional engagement is placed on the correspondingly conically shaped dispensing nozzle 12, is thus bridged by the tube 13b.

The tube 13b closes the outlet opening 13c of the dispensing cannula 13 not, however, but leaves at least sideways a passage gap, preferably an annular gap concentric to the tube 13b for the outlet of the blown air in the outlet opening 13c of the dispensing cannula 13.

The valve chamber 15a is through an adhesive valve line 15b, which guided in the wall of the main part 11 between its cavities and its outside is fed. The glue valve line 15b in turn is from the glue feed line 15c fed.

Next to the hole 12a for the adhesive is through the dispensing nozzle 12 the last section of a blown air valve line 14 and opens into the interior 13a of the dispensing cannula 13 at the end of the dispensing nozzle 12. The blown air valve line 14 is, similar to the glue valve line 15b, through the between the cavities and the outside of the main part 11 remaining wall and is of the blown air feed line 14a fed. Adhesive feed line 15c and blown air feed line 14a are arranged concentrically to one another, the blown air supply line 14a being the adhesive supply line 15c, and are also in this concentric arrangement on the main part 11 connected and only separate in its upper section.

The actual valve mechanism or closure mechanism of the metering valve 10 has a needle-shaped closure member 16, which extends through or in all Cavities of the main part 11 extends. The closure member 16 has at its lower End of a tip with a conical end face 16a. It penetrates the Valve chamber 15a such that it with its conical end face 16a against the Edge 12b of the opening of the bore 12a of the discharge connection 12 to the valve chamber 15a is present. The edge 12b and the end face 16a form the seat surfaces of the metering valve 10. Against this Edge 12b is the closure member 16 with his End face 16a pressed by a spring 18, which is in the uppermost cavity of the Main part 11 between a shoulder on the closure member 16 and a partition or another paragraph on the main part 11 is stretched. Beyond the partition or the paragraph, the closure member 16 has a threaded end with one or more Adjusting screws to adjust the spring tension.

The closure member 16 is formed by two further partition walls of the main part 11 out, through a partition between the valve chamber 15a and the displacement 17a, and through a partition between the displacement 17a and the spring arrangement 18 containing cavity. For sealing the valve chamber 15a against being pushed up of the adhesive is a membrane between the closure member 16 and the main part 11 15 stretched, which consists of polytetrafluoroethylene 0.3 mm thick. A similar Diaphragm 17 is in the displacement 17a, 17b between the closure member 16 and the main part 11 excited.

The membrane 17 is located at the end of the displacement compartment 17a.

At its lower end, the displacement compartment 17a is sealed by a seal 17c sealed gas-tight. In the displacement compartment 17a is one of the blown air valve line 14 branching secondary line 14b out. The closure member 16 can therefore be acted upon of the displacement compartment 17a or the underside of the membrane 17 are lifted with blown air, so that its end face 16a from the edge 12b of the bore 12a of the dispensing nozzle 12 removed. The glue coming through glue feed line 15c and glue valve line 15b is supplied to the valve chamber 15a, is under pre-pressure, see above. that a lifting of the closure member 16 from the valve seat or from the edge 12b of the bore 12a of the dispensing nozzle 12 is sufficient to remove the adhesive from the valve chamber 15a through the bore 12a and through the capillary tube 13b to leave this. the lot depends on the duration of the valve opening and the level of the admission pressure under which the glue stands off.

In the embodiment shown, the metering device is on simple way a device for the automatic timing of the dosing process or delivery process created. The blown air valve line 14 has in its section between the secondary line 14b and the end of the discharge nozzle 12 a throttle point 19 on. It consists of a threaded hole leading to the outside of the main part 11, in which a throttle screw 19a can be screwed so that the blown air valve line 14 at this point continuously narrowed up to its complete closure in cross section can be.

The device works as follows: Through the blown air supply line 14a a compressed air blast is applied to the blown air valve line 14, the pressure of which ranging up to no more than one bar, and its length of time for an exact Function of the dosing process are coordinated.

The pressure surge suffers a delay at the throttle point 19 Pressure propagation, so that initially no blown air emerges from the discharge port 12. However, the pressure surge is passed unthrottled into the displacement compartment 17a and pushes there against the membrane 17, so that the closure member 16 against the force of the spring 18 is raised. This opens the valve or raises the face 16a from the edge 12b of the bore 12a of the discharge nozzle 12. From the one with glue filled valve chamber 15a, which is below the adhesive supply line 15c and the adhesive valve line 15b forwarded form is, can now through the bore 12a of the delivery port 12 and the tube 13b glue leak out. In the meantime the short surge of pressure is over, the time period being matched to the delay the flow is experiencing the Throttle point 19 suffers. The pressurized blast air begins through the throttle point 19 to flow and at the same time closes the closure member 16 as a result of this caused pressure drop in the displacement compartment 17a.

The blown air emerges from the end of the discharge nozzle 12 into the interior 13a of the dispensing cannula 13 and then flows out of the outlet opening 13c of the dispensing cannula along the tube 13b. In the meantime the glue is dispensed through the tube 13b already finished. A drop of glue stuck approximately at the end of the tube 13b is blown off by the blown air. The device is ready for a new dosing process.

Figure 2 shows another embodiment of the metering device according to the invention. Device parts which correspond to those of the embodiment in FIG. 1 have the same unit digits. Here, too, the metering valve 20 consists of a main part 21, which in turn can be composed of several parts. The main part 21 has a dispensing nozzle 22 which has a bore 22a. In the main part 21 are, again concentric, but laterally opening into the main part 21, a Adhesive feed line 25c and a blown air feed line 24a surrounding it concentrically guided. The adhesive feed line 25c opens directly into the valve chamber 25a, which in turn by means of a membrane 25 placed between the closure member 26 and the main part 21 is tensioned against the implementation of the closure member 26 through the main part 21 is sealed against an adhesive leak. The blown air supply line 24a is about in the middle inserted laterally into the main part 21 and from there into the wall of the Main part 21 upwards to a cubic capacity with two compartments 27a and 27b.

The blown air supply line 24a opens into the displacement compartment 27a.

The displacement 27a, 27b is at the upper end of the main part 21 arranged. It is cylindrical and is supported by a piston 27 that slides in it is displaceable, divided into compartments 27a and 27b. The piston 27 is on the Closure member 26 attached so that this with the piston 27 in the cylinder 27a, 27b is displaceable. By a between the top of the piston 27 or the Closure member 26 and the upper end of the limitation of the displacement compartment 27b tensioned Spring 28 becomes the closure member 26 with its frustoconical end face 26a pressed against the edge 22b of the bore 22a of the dispensing nozzle 22.

Here, too, form the conical seat surface 26a of the closure member 26 and the edge 22b of the bore 22a the seat surfaces of the valve, which the valve space 25a against an escape of adhesive through the bore 22a into the dispensing cannula 23 and from its outlet opening.

The blown air valve line 24 is length in this embodiment guided through the closure member 26. It flows into the lower tip an outlet opening 26b which lies within the valve seat surfaces. This means, the outlet opening 26b of the blown air valve line 24 lies within the edge 22b of the bore 22a. The blown air valve line 24 has an inlet opening into the Closure member 26 in the displacement compartment 27. It should also be mentioned that of course the Piston 27 against the cylinder 27a, 27b, in which it is displaceable, as well the closure member 26 against its implementation in the main part 21 accordingly are sealed gas-tight.

The piston 27 has a throttle bore 29, which the two Cubic capacity compartments 27a and 27b connect to one another and indirectly the blown air supply line 24a with the blown air valve line 24.

The device works in this embodiment as follows: Through the blown air supply line 24a is given a short pressure surge, the duration of which and level of pressure for setting a predetermined dosage amount on the flow paths in the dosing valve, as well as are coordinated with one another. The blown air enters the displacement compartment 27a, and a pressure build-up occurs at the throttle bore 29. The flow of the blown air through the throttle bore 29 into the displacement compartment 27b and from there into the blown air valve line 24 is delayed as a result, at the same time but the piston 27 is raised and the closure member 26 opens the valve. the The end face 26a stands out from the edge 22b of the bore 22a, and it can Glue from the valve chamber 25a through the bore 22a into the interior 23a of the dispensing cannula 23, and from there exit the outlet opening of the dispensing cannula 23. this happens without further actuation by the metering valve, because the adhesive is via the adhesive supply line 25c is under a pre-pressure in the valve chamber 25a. Meanwhile the pressure surge is ended, whereby - as is also the case with the first embodiment - for it Care is taken that blown air does not pass through the blown air supply line 24a or 14a can flow back, i.e. a backwater is maintained. The one in the displacement compartment 27a under higher pressure than in the displacement compartment 27b blowing air flows through the throttle bore 29 via the chamber compartment 27b into the blown air valve line 24.

The pressure in the chamber compartment 27a, which is above the piston 27 had lifted the closure member against the pressure of the spring 28, dismantled so that the spring 28 depresses the closure member 26 again and the seat surfaces 26a or 22b come into contact with one another again. The flow of glue through bore 22a is terminated by this. The blown air is now through the blown air valve line 24 up to the outlet opening 26b at the lower tip of the closure member 26 arrives and blows through the bore 22a and the interior 23a of the dispensing cannula 23 the remaining adhesive from the dispensing nozzle 22 and the dispensing cannula 23 out. The device is ready for a new dosing process.

In order to enable the closure member 26 to be moved more easily, can between its upper and lower seal in the implementation through the Main part 21 a vent 30 may be provided. Furthermore, in the wall of the Displacement compartment 27b can be fitted with a control valve as an additional vent.

In the embodiment shown in Figure 2, the inlet opening is of the blown air valve line 24 on the closure member 26 in the displacement compartment 27b laterally on the closure member 26, so that no closure of the blown air valve line through possible abutment of the upper end of the closure member 26 against the upper limit of the displacement compartment 27b can take place. However, the location of this inlet opening is insofar as the valve mechanism is only for a very small one anyway The stroke of the closure member 26 is preferably designed to be a maximum of 1 mm.

In both embodiments, both in FIG. 1 and in the figure 2, are the metal parts of the device that come into contact with glue, preferably made of chemically nickel-plated brass, brass because of the possibility is selected to machine the parts with great precision. Brass is therefore not compulsory; instead, aluminum, which is not so easy to work with because of its low weight can be used with advantage, and here too the aluminum is advantageous chemically is nickel-plated.

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Claims (15)

Claims 1. Device for dosing liquid one-component adhesives, especially of quasi-anaerobic adhesives and cyanoacrylate adhesives, with a controllable Dosing valve, which is connected between an adhesive feed line and a dispensing cannula is, characterized in that the metering valve (10; 20) on a main part (11; 21) a dispensing nozzle (12; 22) on which the dispensing cannula (13; 23) is directly attached connects, as well as a blown air valve line (14; 24), which is attached to the delivery nozzle adjoining interior space (13a; 23a) of the dispensing cannula acted upon. 2. Apparatus according to claim 1, characterized in that the metering valve (10; 20) and the dispensing nozzle (12; 22) are made of metal and that all with the Metal parts or surfaces of the dispensing nozzle and metering valve that come into contact with adhesive from a heavy metal, in particular a metal of the 8th subgroup of the periodic Systems, or alloys thereof, exist or thus by an electroless process are coated. 3. Apparatus according to claim 2, characterized in that the metal parts consist of pure nickel or are chemically nickel-plated. 4. Device according to one of claims 1 to 3, characterized in that that the metering valve (10; 20) one in the direction of flow of the adhesive in front of the bore (12a; 22a) of the dispensing connector (12; 22) arranged valve chamber (15a; 25a), in which the bore opening (12b; 22b) of the discharge nozzle closing, from this liftable closure member (16; 26) is arranged, which by a pneumatic, with respect to the valve chamber sealed lifting device (17, 18; 27, 28), which over the blown air valve line (14; 24) is acted upon, can be actuated, and that the Blown air of the blown air valve line time-controlled by a valve via a Blown air supply line (14a; 24a) can be fed. 5. Device according to one of claims 1 to 4, characterized in that that the blown air valve line (14; 24) separated from the bore (12a; 22a) of the dispensing connection (12; 22) is guided through this and at its end into the interior of the dispensing cannula (13; 23) opens, and that the bore of the dispensing nozzle by means of a tube (13b) with a small cross-section, preferably a capillary tube, which extends through the interior (13a; 23a) of the dispensing cannula extends into its outlet opening (13c), is extended. 6. Apparatus according to claim 4 or 5, characterized in that the metering valve (10; 20) is designed as a needle valve whose needle-shaped Closure element (16; 26) through the valve chamber (15a; 25a) and through a pneumatic one Cubic capacity (17a, 17b; 27a, 27b) is performed, the implementation of the closure member through the partition between the valve space and the displacement through gas-tight seals (17c) is sealed at least against the valve chamber and the valve chamber against the implementation by a membrane clamped between the closure member and the main part (11; 21) (15; 25) is sealed against the escape of adhesive. 7. Apparatus according to claim 6, characterized in that the valve seat surfaces of the metering valve (10; 20) on the edge adjoining the valve chamber (15a; 25a) the bore (12a; 22a) of the dispensing nozzle (12; 22) on the one hand and frustoconical on the formed end face (16a; 26a) of the needle-shaped closure member (16; 26) others are trained. 8. Apparatus according to claim 6 or 7, characterized in that the displacement (17a, 17b) between the needle-shaped one loaded by a spring (18) Has closure element (16) and the main part (11) tensioned membrane (17), the one side against the force of the spring through one of the blown air valve line (14) branched secondary line (14b) for a movement of the closure member in the open position or can be acted upon in the closed position. 9. Apparatus according to claim 8, characterized in that the return spring (18) is constructed or arranged so that the closure member (16) in relative relaxed spring position is in the closed position, and that in the blown air valve line (14) between the branch of the secondary line (14b) and the blow-out end of the blown air valve line a throttle point (19) is connected, which depending on a compressed air blast deliverable via the blown air valve line and the blown air supply line (14a) is dimensioned so that initially only the closure member by the blast of compressed air is raised into the open position, and only with the subsequent lowering of the Closure member in its closed position at the end of the compressed air blast blown air flows through the outlet opening (13c) of the dispensing cannula (13). 10. Apparatus according to claim 9, characterized in that the throttle point (19) is adjustable, preferably by means of an externally in the blown air valve line (14) screwable throttle screw (19a). 11. Apparatus according to claim 6 or 7, characterized in that the blown air valve line (24) passed through the needle-shaped closure member (26) and has an outlet opening (26b) at the tip of the closure member, those within the valve seat surfaces when the closure member is in the closed position, on the one hand on the end face (26a) of the closure member and on the other hand the edge (22b) of the bore (22a) of the dispensing nozzle (22) are provided is. 12. The device according to claim 11, characterized in that the Displacement (27a, 27b) is designed as a cylinder in which a needle-shaped Closure member (26) attached piston (27) together with the closure member against the restoring force of a spring (28) is displaceably arranged, one side of which through the blown air supply line (24a) for a movement of the closure member in the open position or can be acted upon in the closed position. 13. The apparatus according to claim 12, characterized in that the The displacement (27a, 27b) is divided into two compartments (27a; 27b) by the piston (27), which communicate with one another through a throttle bore (29) guided through the piston stand, with the outlet opening of the blown air supply line in the one compartment (27a) opens while the inlet opening is passed through the closure member (26) Blown air valve line (24) opens into the other compartment (27b), and wherein the Return spring (28) is arranged or constructed so that the closure member is relatively relaxed The spring position is in the closed position, and the throttle bore as a function dimensioned in such a way by a compressed air blast deliverable via the blown air supply line is that initially only the closure member is in the open position due to the blast of compressed air is raised, and only with the subsequent lowering of the closure member in its closed position at the end of the blast of compressed air blown air through the outlet opening (26b) of the blown air valve line (24) at the tip of the closure member flows. 14. Device according to one of claims 1 to 13, characterized in that that the blown air supply line (14a; 24a) with a blown air flow or blow low Pressure, preferably up to 1 bar, is applied. 15. Device according to one of claims 1 to 14, characterized in that that the blown air supply line (14a; 24a) and the adhesive supply line (15c; 25c) are concentric are guided up to the main part (11; 21), the adhesive feed line preferably lies inside.