DE102007002980A1 - Adhesive applicator for a paper or cardboard processing machine - Google Patents

Abstract

The device (1) has multiple releasing modules (2) distributed over a working width, where each releasing module comprises adhesive flow connections and adhesive return connections. An adhesive chamber is provided between the adhesive flow and return connections. The adhesive return connections are connected with a common return line (19, 20). A pressure adjusting device (21) is arranged in the common return line, where the adjusting device is formed as a pressure regulating device. The release modules are connected with a common pressure source (15).

Description

The The invention relates to an adhesive application device for a paper or cardboard processing machine with several over a working width distributed output modules, each of which has an adhesive supply port and an adhesive return port, an adhesive space between the glue supply port and the adhesive return port and a closable dispensing opening from the adhesive space having.

A Such adhesive application device is, for example, in a Slitter used in a paper or board web to a manageable role for a later user is wound up. The web must be at the beginning of a winding process on a winding tube, for example a tube made of cardboard, be stuck. When the winding roll has been completed, then The end of the web must also be on the circumference of the roll be stuck. Another example of use Such an adhesive application device is a roller packaging device, wrapped in a finished roll with a packaging web becomes. Again, it is usually required, the packaging web Stick on the circumference of the winding roll when the Verpakkungsvorgang starts. When the packaging process has been completed, then the end of Verpakkungsbahn must also on the Scope of the role, more precisely on an already applied Position of the packaging sheet to be glued.

Between the individual adhesive application processes are accordingly Periods during which the adhesive application must be interrupted. During these times, the dispensing opening is closed.

An output module suitable for such an operation is, for example, in DE 42 11 942 C2 described. Here, the dispensing opening is closed by a valve element which either passes the adhesive from the glue supply port to the dispensing opening or, if the dispensing opening is closed, directs it to the glue return port. So you want to avoid pressure fluctuations that could result in the operation of the output module.

At the Winding webs into bobbins or wrapping the bobbins In many cases, the situation arises that the tracks have different widths have what also leads to different width bobbins. The adhesive application must therefore be limited to the areas where actually the web or the winding roll present is. Accordingly, with different adhesive application processes more or less dispensing openings released. One can Now observe that then again fluctuations in pressure of the supplied adhesive, which are unfavorable affect the adhesive application. If less Output ports are released, so at a low Width of the winding roll, then the adhesive with a higher Print output as at a larger width the winding roll.

Of the Invention is based on the object, the adhesive application reliably to ensure even with changing widths.

These Task is in an adhesive application of the above mentioned type solved in that the adhesive return connections several output modules connected to a common return are and arranged in the return pressure adjustment is.

With Help the Druckeinstelleinrichtung is a pressure in the return generated, which is ultimately decisive for the Pressure with which the adhesive, which is also referred to below as "glue" is outputted from the discharge openings. You can now this pressure with the help of Druckeinstelleinrichtung adjust so that it corresponds to the pressure drop at the complete opening of all the output ports arises. When all the output openings have been released then all the glue can go through the dispensing opening drain and you need no pressure reserve more in the return line. If, on the other hand, not all dispensing openings are released have been, then leaves the pressure adjustment drain some of the adhesive through the return, so that at each discharge opening again the desired Output pressure prevails. This can be the pressure Keep relatively even. pressure fluctuations can be limited to a few percent, which is still acceptable.

Preferably the pressure adjusting device has a variable one Pressure value on. You can then the pressure adjustment to simple Adapt the way to the circumstances. For example, if you have different opening widths for the output ports chooses, then another pressure value will be necessary. You have to be in this Case does not replace the pressure adjuster, but can only set the pressure value.

Preferably the pressure adjusting device is designed as a pressure regulating device. A pressure regulator maintains the pressure in the return line constant, without additional control measures are required from the outside.

Preferably, all output modules are connected to a common pressure source. The Pressure source can be formed for example by a pump, in particular a gear pump, which pumps glue from a storage vessel to the output modules. In connection with the pressure adjustment in the return can be with such a pressure source always generate the dynamic pressure at the discharge openings, which is required for the desired glue application.

Preferably if the pressure source is connected to at least two supply lines, each of which supplies at least one output module. This embodiment is particularly favorable if very many output modules to be supplied. The pressure supply can be then even further, especially then, if the flow lines have a larger cross-section have and accordingly the pressure drop in the flow lines small can be held.

Also is advantageous in that the discharge opening as a nozzle is formed, which is combined with an air nozzle. You can then ejected from the air nozzle Use air to remove the glue from the dispensing opening apply to the surface to be glued. This has the Advantage that the adhesive applicator also "over Head "can be arranged, ie below a web that glued shall be. But you can not just use the air as a transport medium for the glue, but also to the order type of the adhesive. For example, you can turn off the air use the air nozzle to atomize the adhesive, if desired.

in this connection is advantageous if the air nozzle has a spiraled air flow having. A spiraled air duct abuts the air so that a helical Vortex results. In this vortex, the adhesive can then be guided and optionally also be atomized, so that one even with low output pressures for the adhesive a certain distance between the discharge opening and the To be glued web or to be glued circumference of the winding roll can allow.

Preferably the output modules are at least in the region of the dispensing opening heated. The heating prevents the glue solidified in the intervals between the adhesive application and the discharge opening clogged. Accordingly, the adhesive may exit the dispensing opening output as soon as the dispensing opening is released. An increase in pressure, as he had so far in the prior art at the beginning Occasionally an output process could be observed with high Reliability can be prevented. This in turn leads cause a glue bead to come out through the dispensed glue is formed, from beginning to end with an at least approximately constant width can be applied. This also improves the adhesive application.

Preferably the pressure adjustment device is heated. Also in the pressure adjustment can it may be advantageous to solidify the adhesive at least so far as to prevent the pressure adjustment can continue working without disabilities. This will put the pressure on maintained the desired level.

Preferably is at least a part of the lines to the adhesive supply port and heated by the adhesive return port. Thereby prevents a solidifying adhesive changed the line cross section of the lines, which in turn could lead to pressure fluctuations.

Preferably are the output modules on one longitudinal side of a support beam arranged, passed through which a portion of an adhesive circuit is. The support beam has two tasks. On the one hand supports He holds the output modules and holds them in the desired Fixed position. On the other hand, he also serves as a carrier for Lines that are arranged in the adhesive circuit, or it forms even the wires.

Preferably the support beam on an adhesive flow channel, from which for each dispensing module branches off a branch channel to the adhesive flow connection. Also, an adhesive return channel may be provided, the with each output module via another stitch channel with connected to the output module. The individual output modules are then with respect to the adhesive feed channel and adhesive return channel connected in parallel. This has the advantage that also at Failure of one output module, the other output modules undisturbed can continue working.

Preferably is a valve control on another longitudinal side of the support beam arranged for the discharge opening. This will be The available space was particularly well utilized. It can be a defined assignment between reach the valve control and the dispensing opening, without that the valve control assembly or maintenance of the output modules with special needs.

Preferably, an air valve is connected to the valve control via a deceleration device. With the aid of the delay device, it is possible to ensure that air is first emitted from the air nozzle before the discharge opening is released. Also, you can adjust that the discharge port is closed before the air nozzle stops with the output of air. This is a reliable measure to contamination of the output module in the region of the discharge opening to avoid by adhesive. The delay device can be arranged both directly in the area of the air valve and in a centralized or decentralized control. There, the delay device may also be formed by a corresponding program control.

The Invention will be described below with reference to a preferred embodiment described in conjunction with the drawing. Herein show:

1 a schematic representation of an adhesive application device,

2 various uses for the adhesive applicator,

3 a schematic cross section through the adhesive applicator and

4 a side view of the adhesive applicator.

1 shows a schematic representation of an adhesive application device with multiple output modules 2 for dispensing adhesive on a web 3 that, as in 2 is shown on one or more bobbins 4 . 5 to be wound up. When winding a web 3 on a winding roll 4 . 5 must be the beginning of the track 3 with a roll core 6 be glued. When the winding roll 4 . 5 has been completed, then the end of the train 3 on the circumference of the finished winding roll 4 . 5 be stuck. In both cases, a relatively short adhesive application with a length of a few cm at the beginning and at the end of the winding roll 4 . 5 required to be wound up. Between these two jobs, the glue dispensing must be out of the dispensing module 2 to be interrupted.

The output modules 2 are on a stringers 7 arranged and over the working width of in 2 schematically shown winding devices 8a . 8b . 8c distributed. For example, you have a distance of about 150 mm to each other. The output of the adhesive is in the direction of gravity substantially upwards, so that the web 3 can be glued from below. The train 3 then becomes one of the support rollers 9 . 10 or around a back-up roll 11 led around that the glued side is outside. If then the train 3 through a nip between the carrier roll 9 . 10 or the back-up roll 11 and the corresponding winding roll 4 . 5 reaches, it is at the periphery of the winding roll 4 . 5 taped.

The adhesive applicator 1 has a heated storage tank 12 for glue 13 on, which is designed as a hot melt adhesive. The adhesive 13 can be in the form of solid pieces or granules 14 in the reservoir 12 be introduced and melted there.

A pump 15 , For example, a gear pump, by a drive only schematically shown 16 is driven at a constant capacity, promotes the adhesive 13 from the reservoir 12 over a filter 17 in several flow lines 18 leading to the stringer 7 to lead. From the stringers 7 go return lines 19 to the reservoir 12 back. In many cases, there will be a return line 19 suffice. In a common section 20 the return lines 19 is a pressure regulator 21 arranged the pressure of the adhesive in the return line 19 or the return lines 19 keeps constant at a preset reference value. However, the setpoint can be changed from the outside, which is indicated by an arrow 22 is indicated. The adhesive is thus through the flow lines 18 , the stringers 7 and the return lines 19 circulated, as far as the adhesive is not through the output modules 2 towards the train 3 is ejected.

The 3 and 4 now show more details of the adhesive applicator 1 , where the same elements as in 1 are provided with the same reference numerals.

The supply line 18 is with a flow channel 23 connected. The return line is with a return channel 24 connected. The flow channel 23 and the return channel 24 are as longitudinal bores in the stringers 7 trained, ie they enforce the support beam 7 over its entire length.

The flow channel 23 is via a first branch channel 25 with the output module 2 connected. The return channel 24 is via a second branch channel 26 with the output module 2 connected. Accordingly go to the flow and return channels 23 . 24 each one of the number of output modules 2 corresponding number of first and second branch channels 25 . 26 from. The individual output modules 2 are then with regard to the flow and return line 18 . 19 connected in parallel.

The output module 2 has one with the first stitch channel 25 connected supply connection 27 and one with the second branch channel 26 connected return connection 28 on. Between the supply connection 27 and the return port 28 is an adhesive space 29 provided, which is continuously flowed through with adhesive. The glue room 29 has one as a nozzle 30 trained dispensing opening on, with the help of a valve element 31 can be released or closed. This valve element 31 is as educated as this in DE 42 11 942 C2 is described. So if the valve element 31 the nozzle 30 (or one to the nozzle 30 leading channel), then it automatically opens one Path from the glue room 29 to the second branch channel 26 and thus to the return channel 24 ,

To the nozzle 30 around is an air nozzle 32 arranged over a pipe 33 with an air valve 34 connected is. The air nozzle 32 directs an air jet or multiple air jets not only parallel to the discharge direction of the nozzle 30 but also with a component tangential to it. In this way creates a spiraled air duct, which generates an air vortex, through which out of the nozzle 30 issued adhesive is performed. The air jet also serves to atomize the adhesive, if desired. The administration 33 is with an air inlet 35 connected.

The valve element 31 is also driven pneumatically via a piston 36 , the actuating air via a solenoid valve 37 can be supplied. The air valve 34 and the solenoid valve 37 are with a common control 38 connected, which ensures that the air valve 34 always in front of the solenoid valve 37 switched on and always off after him, so forms a delay device. In this way one can ensure that whenever glue from the nozzle 30 is ejected, an air jet from the air nozzle 32 is present, which dissipates the adhesive. Adhesive contamination around the nozzle 30 is thus reliably prevented.

A heating device 39 heats the stringers 7 and also the output module 2 at least in the area of the nozzle 30 , This prevents the adhesive from getting 13 , which is designed as a hot melt adhesive or "hot melt" can solidify. He is rather kept flowing continuously, so that he through the pump 15 can be promoted in the circulation.

For a desired adhesive ejection from the nozzle 30 of each output module 2 a predetermined pressure is required. The pressure regulator 21 is now set to produce exactly that pressure. So if all the output modules 2 Apply adhesive, then the return 19 through the pressure regulator 21 locked, so to speak, ie the total amount of the adhesive 13 coming from the pump 15 is funded by the output modules 2 output.

If at a smaller width of the bobbins 4 . 5 when gluing the web 3 not all output modules 2 be activated, then leaves the pressure regulator 21 In simple terms, the amount of adhesive 13 to the reservoir 12 do not flow back through the output modules 2 can be ejected. This creates a dynamic pressure that meets exactly the needs of the open output modules 2 covers. The output pressure, ie the pressure of the adhesive in front of the output modules 2 , can then be kept very evenly. At a pressure of the order of 10 bar, the fluctuations amount to only 0.1 to 0.15 bar.

In addition to the heater shown 39 in the stringers 7 can still be provided more heating devices that the pressure regulator 21 , the pump 15 or other components of the circuit through which the adhesive is passed.

As in particular from 3 it can be seen, the adhesive is just up to the nozzle 30 circulated so that basically only the nozzle 30 still clogged if a longer production break occurs with cooling. The nozzle 30 is in a nozzle housing 40 Arranged easily from the output module 2 can be unscrewed if necessary. In this way it is also possible to use a nozzle 30 to replace it with another nozzle of a different size. Accordingly, the nozzle openings in the range of, for example, 0.2 to 2 mm elected who the. The adhesive applicator 1 can therefore be easily adapted to different needs.

The pressure regulator 21 can also be operated so that it, if no adhesive from the output modules 2 is to be output, the pressure in the return 19 to a minimum value. The pump 15 can then be operated practically without or only with low losses. As the adhesive applicator 1 "knows" when glue from the output modules 2 can be issued, it can the pressure regulator 21 Start up shortly before this glue dispensing, so that if glue is to be dispensed, then the necessary back pressure in the return line 19 is available.

The adhesive output from the output modules 2 For example, it is controlled to have a line of perforations transverse to the direction of travel of the web 3 has been introduced into the web, in the direction of the web 3 covered, for example, by 2 to 5 cm on both sides of the perforation line. After separating the web can then the end of the old train to the now finished winding roll 4 . 5 and the beginning of the new track on the new sleeve 6 be attached.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 4211942 C2 [0004, 0034]

Claims (14)

An adhesive applicator for a papermaking or paperboard converting machine having a plurality of dispensing modules distributed across a working width, each having an adhesive supply port and an adhesive return port, an adhesive space between the adhesive supply port and the adhesive return port, and a closable dispensing port from the adhesive space, characterized in that the adhesive return ports ( 28 ) of several output modules ( 2 ) with a common return ( 19 . 20 ) and in the return ( 19 . 20 ) a pressure adjusting device ( 21 ) is arranged. Device according to Claim 1, characterized in that the pressure adjustment device ( 21 ) a variable pressure value ( 22 ) having. Device according to claim 1 or 2, characterized in that the pressure adjustment device ( 21 ) is designed as a pressure control device. Device according to one of Claims 1 to 3, characterized in that all output modules ( 2 ) with a common pressure source ( 15 ) are connected. Device according to claim 4, characterized in that the pressure source ( 15 ) with at least two flow lines ( 18 ), each of which has at least one output module ( 2 ) provided. Device according to one of claims 1 to 5, characterized in that the dispensing opening ( 30 ) is formed as a nozzle, which with an air nozzle ( 32 ) is combined. Device according to claim 6, characterized in that the air nozzle ( 32 ) has a spiraled air guide. Device according to one of claims 1 to 7, characterized in that the output modules ( 2 ) at least in the region of the discharge opening ( 30 ) are heated. Device according to one of Claims 1 to 8, characterized in that the pressure adjustment device ( 21 ) is heated. Device according to one of claims 1 to 9, characterized in that at least a part of the lines ( 18 . 19 . 20 ) to the adhesive flow connection ( 27 ) and the adhesive return port ( 28 ) is heated. Device according to one of claims 1 to 10, characterized in that the output modules ( 2 ) on a longitudinal side of a supporting beam ( 7 ) are arranged through which a portion of an adhesive circuit is guided. Device according to claim 11, characterized in that the supporting beam ( 7 ) an adhesive flow channel ( 23 ), of which for each output module ( 2 ) a branch channel ( 25 ) to the adhesive flow connection ( 27 ) branches off. Device according to claim 11 or 12, characterized in that on another longitudinal side of the support beam ( 7 ) a valve control ( 37 ) for the discharge opening ( 30 ) is arranged. Device according to claim 13, characterized in that an air valve ( 34 ) with the valve control ( 37 ) via a delay device ( 38 ) connected is.