DE10123099C1 - Machine for continuous manufacture of absorbent layers includes suction device removing layer locally, to cause interruptions along absorbent product - Google Patents

Abstract

A suction device (e.g. transversely-slotted belt) sucks-off absorbent of a first layer, at defined locations. This causes interruptions along the length of absorbent

Description

The present invention relates to a method for producing an absorbent sheet by means of at least one absorbent layer, the absorbent layer being produced continuously. Furthermore, a device for producing such a suction layer is Provided. The device has at least a first feed, a second Feed and a suction supply. By means of the first feed, a first layer and by means of the second feed a second layer is fed to to arrange at least one absorbent layer in between.

A method is known from EP 0 429 393 A2 in which suction pads are used for Absorbing body fluids are made in hygiene articles. According to the The method described there can be of any shape without suction pads time-consuming stratification of partial layers can be produced continuously, wherein Excess material is sucked off during profile extraction and returned becomes. The suction pads manufactured in this way can be separated from each other thanks to a separating edge be separated. EP 0 860 158 A1 discloses a process for producing one Suction layer, which has a layer of absorbent. A first layer, preferably made of airlaid material, a second layer, preferably made of the same material, superimposed, whereby suction is arranged between these two layers. The first as well as the second layer are continuously brought together. Then will cut this absorbent sheet, the cutting edges of the first as well as the second Able to be spread apart to form an adhesive as a binder to this Apply end faces.

Starting from this prior art, it is an object of the present invention to create a method as well as a device for an automated To facilitate manufacturing and at the same time a time to manufacture to minimize a finished product as well as materials to be used.  

This object is achieved with a method for producing a suction layer Features of claim 1 and with a device for continuous Production of a suction sheet with the features of claim 10, with a device with the features according to claim 11 as well as a device with the Features of claim 12 solved. Furthermore, a suction layer with the features of claim 15 created.

The method according to the invention for producing a suction layer with at least one The absorbent layer provides that the absorbent layer is manufactured continuously. A first one Layer is fed to a second layer so that the first and second layers surround at least one absorbent layer. A binder becomes transverse to one Direction of movement of the first layer arranged at least in strips to between Separately arranged absorbent layers to produce a Cross sealing of the suction layer to be positioned.

A further development of the method provides that before the binder is applied part of the absorbent layer is removed from the first layer. On one like that Free section of the first layer can then be the binder without any annoying Binder particles are arranged, in particular are applied. This facilitates the connection, preferably gluing, of the first to the second Location. In addition, it is avoided that tensile and / or shear forces acting on a attack later product made from the suction layer, micro cracks in the through this type of connection formed seal occur. A tearing or opening of the product, which is closed in and of itself, is prevented. Preferably creates a transverse seal of the absorbent layer by means of the binder. Furthermore there is a possibility that there is a continuous cross seal Longitudinal sealing of the suction layer is generated. According to a further training there is also the possibility that cross sealing like longitudinal sealing by one and the same Binder are generated, for example by a full-surface application on the first location. According to a further embodiment, it is provided that for one Cross sealing a first dosage unit is provided for a Longitudinal sealing of the suction layer a second dosage unit. This enables  that different binders and amounts can be used for the respective seal are.

According to a further development, the binder is at least partially, preferably only in defined areas, fed discontinuously. That means, for example, on the In the first layer, the binder is only in a certain section. This Section can form a transverse seal or also a longitudinal seal. There is also the possibility that one or more layers of absorbent Binding agents are at least partially loaded or also penetrated. This can be done Binder, for example, between different superimposed ones Absorbent layers are arranged.

According to a further embodiment of the invention, at least part of the Sealing mechanically generated, the binding agent being a mechanical one Forms connection between the first and the second layer. A mechanical one Binding is possible by means of carding, embossing, folding or in some other way Material of the first layer with the material of the second layer, for example, in or is hooked together. An embodiment of the invention provides a calender with this at least a first and a second roller. The first roller is for example a smooth roller. The second roller is provided with a surface contour Counter roll, in particular an engraving roll. Due to the surface contour the first and the second layer according to the contour with each other at least in Sub areas connected. Complete sealing is preferably carried out by at least one absorbent layer. By selecting the surface contour, the Geometry of the seal can be determined. Further training sees the Before using two rollers, both of which have a structure, in particular in such a way that one roller partially engages the other. The enables the formation of, for example, three-dimensional seals.

A further development provides that the first and / or the second layer have at least portions contain that cause a sticking under pressure and / or heat. This can For example, be adhesive fibers that are included in at least one layer. There is also the possibility that at least one of the two can be connected to one another  connecting layers contain bicomponent fibers that bind a surface enable. According to a further embodiment, between the first and the second layer a thin adhesive film. The adhesive film connects the two layers together. The adhesive film can be fed in wide strips, lengthways or crosswise to enable longitudinal or transverse sealing. Be the first and second layer, for example guided by a calender, takes place according to the Surface contour and the arrangement of the adhesive a seal.

A further embodiment provides that an adhesive is at least partially on the second Layer is applied, which follows the first carrying the absorbent layer Location is fed. This enables in particular the use of one in contact with the standing binder application device that has at least one strip Arrange binder on the layer. According to another embodiment for example a transverse and / or a longitudinal strip of binder on the first layer applied and then at least one absorbent layer preferably in Binder-free area of the layer applied.

The binder can be used wet or dry, especially on one layer be applied. This can also be done using rotary printing, for example or screen printing a binder can be applied. Besides one closed strips of binder there is also the possibility To use binder points, binder lines or other geometries. Farther the binder can be sprayed, for example by spiral spraying, be applied. Another embodiment provides for the use of a Fiber spray device before. By means of this, adhesive fibers are between the first and second layer positionable to create a seal. In particular, Use so-called "hot melt" for sealing, which in heated form is a has a higher viscosity than at room temperature and therefore especially above Nozzles can be applied. For example, a rubber-based "hot melt" based.

According to a further embodiment, a melt film can be used as the binder become. The melt film is preferably at least vapor permeable, in particular  liquid permeable. For this purpose, the melt film can be perforated, for example on suitable mechanical or chemical way. There is also the option of a Use nonwoven. Hot melt nonwoven like hot melt foil join under pressure or Heat the first and second layers together in the desired places.

An adhesive application is preferably used to seal about 1 to 7 g / m ² , in particular of about 3 to 4 g / m ² . The absorbent used can be between approximately 30 g / m ² and approximately 500 g / m ² , preferably approximately between 50 g / m ² and 300 g / m ² .

An additional embodiment provides that in addition to a mechanical seal also sealing by means of another connection means in the case of a suction layer is provided. For example, the transverse sealing can be done mechanically Longitudinal sealing by applying an adhesive.

Through a strip-shaped arrangement of a binder, preferably one strip-shaped application transverse to the direction of movement is a later sealing in a subsequent work step without the suction layer again would have to be cut open. Rather, the suction layer produced in this way continuously manufactured and divided accordingly. Each Separate layers of absorbent can be sealed, for example be connected to a subsequent processing step. For example, the absorbent sheet can be wound up or stored as it is in particular from WO 98/57877, WO 98/58864, WO 99/59907 and WO 00/53513 evident. The content of these writings is related to the filing like Consolidation as well as in relation to further processing and thereby referenced boundary conditions and possibilities. Another procedure for the deposition of the material emerges from WO 98/18706, to which likewise hereby regarding the type of storage as well as those to be observed Parameter is referenced.

When storing the suction layer, it is preferably ensured that folds are only in Areas occur in which no absorbent layer is arranged. Is to  for example a layer of absorbent can be detected, for example by means of a CCD Camera, via a capacitance measurement or by means of a marking that is mechanical or is supplied to the suction layer in another way. About a corresponding one For example, a sensor device is fed to the storage device, whereby, for example, a folding of the suction layer by a corresponding one Reversal of the tray is effected. When storing the suction position on a Roll is preferably with different tensile forces acting on the suction position worked. The tractive forces are different and especially from the Winding speed as well as the respective loading condition of the Winding drum dependent. The aim here is that the wrap is too loose is avoided.

A further embodiment of the method provides that only after a complete sealing of the absorbent layer the first and the second layer get cut. This has the advantage that no absorbent material can escape can and made-up absorbent pads that can be processed from the absorbent layer can be produced continuously according to predefinable parameters. Farther enables a previous complete sealing, for example that Production of the suction layer in-line with subsequent processing in one Finished product is done. On the other hand, there is also the possibility of following the suction position Production to store accordingly and the required at a processing location To assemble dimensions. For this purpose, the suction layer advantageously has appropriate marking agents, such as coloring, metallic ink or requirements or similar detectable means that are active or passive over a corresponding detection device on the further processing device, for example for position detection.

The method described above enables on the one hand a filing of the still not separated, but already sealed absorbent layers. To the another, is allowed to be fully sealed and spaced apart Absorbent layers stored together and then one Further processing can be carried out in which the sealed absorbent layers be separated at least partially or completely.  

A further embodiment of the invention provides that the individual, separate and sealed absorbent layers and individual Suction layers are fed for further processing. For example, the individual suction layers are transported together, but are in their transport packaging already separate from each other. There is a possibility of individual Store suction pads in magazines, preferably stack them, so that they used in particular directly from the magazines in a processing plant can be.

Another possibility in the manufacture of the suction layers is on the one hand that not just one but several layers of absorbent are arranged one above the other become. These can be made of the same material or different. The latter allows the selection of the suction medium used and its behavior For example, a targeted liquid transport within the absorbent layers to achieve. Several layers of absorbent can also be superimposed be separated from each other, for example by another layer, an adhesive film or similar.

On the other hand, there is the possibility that adjacent absorbent layers in Transversely to each other are arranged. This alternating arrangement on the one hand, allows suction layers of different lengths to coexist can be produced. There is also the possibility that, for example Applicators for binders or the absorbent itself as well as one Extraction device for excess binder work more precisely because neighboring contours are less disturbed during machining.

According to another embodiment, a suction layer can also have several strips are formed, which are next to each other and are not separated from each other. The enables, for example, one or more suction layers to be folded over one another to form a suction pad. A seal forms preferably a fold-over level.  

Furthermore, the invention provides a device for the continuous production of a Suction layer available. The device has at least one first feed, one second feed and a suction feed. By means of the first feed a first layer and a second layer are fed by means of the second feed, to place at least one absorbent layer in between. On the device is a suction device is arranged to suction at defined points from the first layer suction to generate interruptions along a suction line.

According to a further independent device for the continuous production of a Suction layer with at least a first feed, a second feed and one Suction supply is at least one web across a direction of movement on the first layer can be applied in order to create a boundary surface for the absorbent to be applied form, wherein the web is designed so that a surface on the first layer is free is held to be part of a cross seal of a suction sheet.

Another continuous device proposed independently Production of a suction layer has at least a first feed, a second Feed and a suction supply. By means of the first feed, a first layer and by means of the second feed a second layer are fed to to arrange at least one absorbent layer in between. The suction supply is a binder device arranged downstream, with the binder device a binder can be applied discontinuously to the material.

The proposed devices are integrated individually or together in one System for merging the first layer, the second layer and the at least a layer of absorbent can be used one or more times in series. This integration enables the suction layer to be produced continuously, whereby at the same time one or more corresponding steps are taken that subsequently lead to the sealing of layers of the absorbent layer. On In this way it is possible to have different production steps within a plant and To provide device. This saves time and effort, otherwise arranged outside of the device Processing stations would arise.  

A further development provides that a storage device is connected downstream of the for example connected to each other, but by complete sealing absorbs separate layers of absorbent. Preferably, the Storage device on detection means, by means of which sections of the suction position and can be distinguished without a layer of absorbent. That allows, according to the To be able to make a controlled placement of the position of the suction position.

Furthermore, the invention provides a suction layer with at least a first layer, a second layer and a suction layer, the suction layer being arranged between the first and the second layer. A transverse seal of the absorbent layer has a different binder than a longitudinal seal. According to a development of the suction position, a force to destroy a transverse seal is greater than the force to be applied in a longitudinal seal, or vice versa. For example, a force of at least 20 N / m ² to 25 N / m ^{2 is} required to achieve destruction. If thermoplastics are used for sealing, it is advantageous if a heat seal strength is measured, which is preferably in a range of over 2 N / 15 mm in a heat seal range of approximately 50 ° C. to 180 ° C. In particular, values of more than 6 N / 15 mm, preferably more than 9 N / 15 mm, are aimed at before the connection is completely destroyed. For example, the spring test or the Top Wave DTC can be used as a test method.

The suction layer preferably has at least one marking means, based on which for example a finishing line, for example a cut, a folding line Start and / or end of a suction layer, a position of the suction position as Reference point for a further processing system and other is detectable. On or several markers can be in the absorbent layer, in a seal or be arranged in one of the layers.

The invention further provides a suction device for a device for continuous production of a suction layer before, the suction device so is formed that at least one point for suction of suction material on a  first position by opening or closing a suction of the suction device is defined.

Further advantageous refinements and developments are in the following Drawing listed. The details and details described there Features specified features in terms of manufacture as well as used Materials, parameters, boundary conditions, structures, individual parts and their Interaction and explanations are generally also with other devices and method of the invention, whether or not described above or below, usable. In particular, these are those described above and below Refinements to further advantageous developments can be combined. Show it:

Fig. 1 A with slots provided continuously revolving belt,

Fig. 2 shows the band illustrated in FIG. 1 is installed in a first apparatus for continuously producing an absorbent layer,

Fig. 3 shows a second apparatus for continuously producing an absorbent layer,

Fig. 4 shows a third apparatus for the continuous production of an absorbent layer,

Fig. 5 shows a fourth apparatus for producing an absorbent layer having a roller,

Fig. 6 shows a fifth device comprising a roller which has on the surface depressions,

Fig. 7 shows a sixth device with a band, which has depressions,

Fig. 8 shows a seventh device with a hollow roll with variable suction openings,

Fig. 9 a eighth device including, for example, a hollow cylinder as shown in FIG. 8,

Fig. 10 is a section through a hollow roller, as is apparent from, for example, Fig. 8,

Fig. 11 is a suction channel, as can be used, for example, in a device according to Fig. 9,

Fig. 12 is a schematic view of an example of a suction port,

Fig. 13 a ninth apparatus for producing an absorbent layer,

Fig. 14 shows a tenth apparatus for producing an absorbent layer,

Fig. 15 shows an eleventh apparatus for producing an absorbent layer and

Fig. 16 is a schematic plan view of an absorbent layer with a detection unit.

Fig. 1 shows a band 1, which runs around a first pulley 2 and a second roll 3. The band 1 has slots 4 . The slots 4 extend transversely to a direction of movement of the belt 1 . The band 1 is preferably made of a plastic material which is reinforced, for example, by means of fiber inserts. The slots 4 contained in the Band 1 go through the tape 1 passes. According to a further development, material is at least partially reinforced adjacent to the slot 4 in band 1 , so that no cracks occur when the band 1 is under tension.

Fig. 2 shows a first device 5 for producing a suction layer. The first device 5 has the first roller 2 , second roller 3 and the belt 1 shown in FIG. 1. Furthermore, the first device 5 has a third roller 6 and a fourth roller 7 . A second belt 8 runs around the third roller 6 and the fourth roller 7 . The second belt 8 is preferably a mesh belt, but may also have no openings, but rather a closed surface 9 . A layer is continuously applied to the surface 9 of the second band 8 , onto which a layer of absorbent 10 is in turn applied. The belt 1 and the second belt 8 preferably move at the same speed, so that the absorbent layer 10 is moved in the direction of the arrow. A suction device 12 can be arranged in the cavity 11 formed by the band 1 and the first roller 2 and the second roller 3 . The suction 12 is indicated schematically and can be implemented, for example, by means of a box profile arranged in the cavity 11 . For example, the box profile has a lower pressure than the ambient pressure. As a result, the material of the absorbent layer 10 arranged in the immediate vicinity of the slots 4 can be sucked off. For this purpose, the second band 8 is preferably at least partially porous or air-permeable in some other way. According to a further embodiment, an excess pressure is at least partially impressed in a second cavity 13 , which is formed by the third roller 6 , the fourth roller 7 and the second belt 8 , so that the material of the absorbent layer 10 to be extracted also gets into the suction 12 , However, the suction 12 in turn does not have to be arranged in the first cavity 11 . Rather, it can also be present in the second cavity 13 . There is also the possibility that the suction takes place over a larger area, so that the slots 4 traverse a longer path through the suction 12 . This allows the material to be lifted off the second belt 9 and removed permanently, preferably at relatively low pressures. According to a further development, which is not detailed here, it is possible to work with at least one pressure gradient within the suction. For example, when the slits 4 pass through the suction 12, the pressure will increase or decrease. The decrease or increase in pressure can take place suddenly. This is made possible, for example, by means of a pressure reduction and also via various pressure connections on the suction 12 itself.

Fig. 3 shows a second apparatus 17 for continuously producing a wicking layer. The absorbent layer 10 is in turn continuously deposited on a storage belt 14 , which rotates around a first roller 15 and a second roller 16 . The second device 17 has a suction device 18 . The suction device 18 is arranged above the storage belt 14 . It has a roller system 19 , via which suction devices 20 are moved. The suction devices 20 are connected to one another via a guide system comprising a first connecting band 21 and a second connecting band 22 . The respective distance between the suction devices 20 can preferably be changed. Likewise, the first and the second connecting band 21 , 22 are designed such that additional suction devices 20 can be used. The suction devices are guided via the roller system 19 on an upper path 23 opposite to a direction of movement of the storage belt 14 . By deflection by means of the roller system 19, the extractor 20 along a lower path 24 in the same direction as the moving direction of the deposit belt 14 are guided. The result is that a lower opening 25 of a suction device 20 slowly approaches the suction layer 10 . The suction device 20 has, for example, a suction nozzle 26 at an opposite end arranged to the lower opening 25 . The suction nozzle 26 is connected to a vacuum unit, which is not shown here. Due to the slow approach of the lower opening 25 towards the storage belt 14 , material in the immediate vicinity of the lower opening 25 is sucked off. The suction device 18 is preferably arranged such that the lower end 25 projects as far as the storage belt 14 . This ensures that the absorbent layer 10 is completely removed in this area. The extent of the suction of the absorbent layer immediately adjacent to the lower opening 25 can be set via various parameters. These include, for example, the rotational speed of the storage belt 14 and the roller system 19 , an adjustment of the respective speeds (it is also possible to set a speed difference between the storage belt 14 and the suction device 20 ), the design of the lower opening 25 , for example additional suction openings along the at least in the Absorbent layer 10 engaging length of the suction device 20 , an air volume flow as well as a volume itself that is sucked off, a gas permeability of the storage belt 14 , a preprocessing of the absorbent layer 10 (for example, this can be in the form of loose powder of different grain diameter consistency, as pre-consolidated absorbent material as well as, for example, in the form of Grains attached to one another, in particular glued grains, preferably as a hardened layer). In the illustrated in Fig. 3 as well as Fig. 2 devices directly screened Tenden with the Saugmittelschicht 10 in contact surfaces are preferably formed so that the Saugmittelschicht stays 10 do not adhere to these surfaces, when these surfaces are removed from the Saugmittelschicht 10. This takes place, for example, via a corresponding selection of the material of the surface, a corresponding surface treatment, for example in the form of a coating. In particular, the aim is that the tendency of this surface to adhere to the absorbent layer 10 is less than the strength and thus the integrity of the absorbent layer 10 on at least its surface, in particular also over the entire material cross section of the absorbent layer 10 .

Fig. 4 shows a third device 27 for making a wicking layer. The device 27 , like the second device 17 shown in FIG. 3, realizes the idea of partial contact of a suction with the absorbent layer 10 . This partial surface contact is preferably limited to a suction device such as in the form of a suction device. FIG. 4 shows an embodiment in which the material of an absorbent layer 10 is moved on a conveyor belt 28 in the direction of the arrow. The third device 27 has a suction device 29 which also rotates. The suction device has a first transport roller 30 , a second transport roller 31 and a guide belt 32 . Suction ports 33 are embedded in the guide band 32 . The suction ports 33 are guided by the guide belt 32 around the transport rollers 30 , 31 . They come into contact with the absorbent layer 10 . A suction box 35 is arranged in an interior 34 . If the suction nozzle 33 comes into contact with the suction box 35 , the material of the absorbent layer 10 arranged in the region of the suction nozzle 33 is suctioned off. The suction box 35 is advantageously designed such that suction stops before the suction nozzle 33 no longer has any contact with the absorbent layer 10 or with the conveyor belt 28 . This prevents that when the suction nozzle 33 is lifted off by continuing along the second transport roller 31 , material could still be sucked off laterally from the absorbent layer 10 or also fall back again. Preferably, the suction point 33 of Fig. 4 as well, for example in other technical developments in the Saugmittelschicht 10 engaging or adjoining devices such a geometry that an edge portion 36 remains largely undamaged. Appropriate design, for example in a conical, in a rounded, in a convex, conical or other manner, makes it possible to obtain a precisely defined edge region 36 within the absorbent layer 10 after the suction has taken place.

Fig. 5 37 illustrates a fourth device for making a wicking layer. The fourth device 37 has a drum 38 instead of a circulating belt in order to achieve suction of material of the absorbent layer 10 . The drum 38 is a hollow cylinder, in the outer edge 39 inserts 40 are arranged. Instead of the inserts 40 , the drum surface can also be provided with bores or appropriately shaped protuberances. Preferably, a portion of the inserts 40 protrude from the surface of the drum 38 and can thus engage the absorbent layer 10 . A suction device 41 is arranged inside the drum 38 . The suction device 41 has a first boundary 42 and a second boundary 43 . At each end 44 of the boundaries 42 , 43 , an inner surface 45 of the drum 38 seals off. The material sucked off by the absorbent layer 10 preferably passes via a discharge 46 to a further processing station, where the material can be processed and returned to the process. The first limitation 42 as well as the second limitation 43 are preferably adjustable, as a result of which the suction or the extent of the suction is adjustable. This adjustment option is indicated by arrows. The inserts 40 preferably extend longitudinally parallel to the axis of the drum 38 . According to a further development, they have such a geometry that makes it possible for the area of the inserts 40 that comes into contact with the absorbent layer 10 first to allow material of the absorbent layer 10 to be cut out. This is particularly advantageous when the absorbent layer 10 already has a certain strength on its surface, for example by prior hardening as can be achieved by heating. Furthermore, an outer surface 47 of the drum 38 can be designed such that it has an embossing effect on the surface of the absorbent layer 10 . For example, a design on the surface of the absorbent layer 10 is possible in this way. This shape can, for example, be convex, concave, wavy, zigzag-shaped or in some other way. This is indicated by a dashed line along a section 48 of the absorbent layer 10 . This first section 48 is separated from a subsequent second section 49 in the direction transverse to the direction of movement of the treadmill 50 carrying the absorbent layer 10 . The absorbent layer 10 which is still connected in front of the drum 38 has interruptions 51 due to the suction. These interruptions 51 can be arranged in the longitudinal as well as in the transverse direction to the direction of movement of the treadmill 50 . The interruptions 51 are preferably designed such that there is no absorbent material on the treadmill 50 in these areas. The treadmill 50 can also be air-permeable, as in the previous devices. Another possibility is to provide a multi-layer treadmill 50 , each of these layers preferably having a different porosity. In particular, the porosity decreases from the layer that comes into direct contact with the absorbent layer 10 to the most distant one. The treadmill 50 can also be designed in such a way that it has a type of carrier layer which is able to secure the necessary strength properties for long-term operation. Additional layers on or around this carrier layer can have further functions: for example improved absorption of the absorbent layer, good permeability and channel effect of air flowing through, etc.

Fig. 6 shows a fifth device 52 for making a wicking layer. The fifth device 52 has an application drum 53 . A surface 54 of the application drum 53 can be smooth, in particular also roughened or also have depressions. Absorbent material 56 is supplied to the surface 54 or the depressions via a suction medium layer feed 55 . The absorbent material can be supplied, for example, continuously or discontinuously, so that sections of absorbent material 56 are preferably formed which are separate from one another. For example, an application roller 57 of the absorbent layer feed 55 can have subdivisions, so that not only is the separation of absorbent material 56 in the transverse direction, that is to say parallel to an axis of the application drum 53 , but also in the circumferential direction of the application drum 53, for example in the form of gaps. An application with absorbent material 56 is preferably carried out at least in the immediate vicinity of the highest point of the application drum 53 . In particular, an order can also be executed somewhat before this point 58 . This ensures that a uniform material application takes place on the application drum 53 .

Preferably not too far from the application of the absorbent material 56 , a first layer 60 is guided to the application drum 53 via a first feed 59 and brought into contact with the absorbent material. Pressure rollers 61 ensure that the absorbent material 56 and the first layer remain in their position. A binder is preferably applied to the first layer 60 via a binder device 62 such that the binder comes to lie transversely to a direction of movement of the first layer 60 between absorbent layers arranged separately from one another. Following this, a second layer, which is not shown in more detail here, is applied to the first layer 60 and the absorbent material 56 . Where a binder is present via the binder device 62 , a transverse sealing of the suction layer thus created is achieved.

A development of this fifth device 52 provides that the absorbent layer feed 55 is followed by a second binder device 53 . There is also the possibility that the second binder device 63 is also arranged in the direction of movement of the application drum 53 in front of the absorbent layer feed. Furthermore, a layer material 65 is acted upon by a layer material 65 with absorbent material 56 or a binder via a layer feed 64 indicated by dashed lines. The second layer 66 is then fed via the first feed 59 , so that a suction layer 67 is continued from the application drum 53 . This preferably already has a transverse as well as a longitudinal seal. For example, the second binder device 63 may not only be able to discontinuously supply binders for this purpose. Rather, there is also the possibility that the second binder device 63 allows continuous binder supply in certain sections. If different binders are to be used for transverse sealing and longitudinal sealing, an additional binding device upstream or downstream of the second binding device 63 , which is not shown here, is provided, for example. This allows separate binder feeds, which can be operated at different pressures and temperatures, depending on the type of binder.

FIG. 7 shows a sixth device 68 for producing a suction layer, which uses a tape 69 . The tape 69 may have a roughened surface. Roughening means that the suction medium 72 supplied by a suction medium supply device 71 is deposited continuously or, as shown, partially on the belt 69 and is subject to good adhesion there. Furthermore, the band 69 can have depressions 70 . Absorbent 72 is introduced into these depressions. Excess material can be fed into the interior of the belt 69 , for example. For this purpose, the belt 69 can be constructed, for example, in the manner of a mesh, so that suction means 72 can only be deposited on the correspondingly provided surfaces. There is also the possibility that excess absorbent 72 is sucked off. A layer feed device 73 is arranged downstream of the suction device feed device 71 . A first layer 74 can be guided onto the belt 69 via the layer feed device 73 . Pressure rollers 75 ensure that the suction means 72 remains in position on the first layer when being transferred from a large roller 76 to a subsequent detaching roller 77 . The detaching roller 77 , as is preferably the case with all solutions which have direct contact between the absorbent or absorbent layer or the layers, is preferably designed such that detachment of a surface in contact with the absorbent or layer does not destroy the desired one Arrangement of the absorbent layer leads to one or both layers. The detaching roller 77 is preferably arranged downstream of an adjusting roller 78 . Detaching roller 77 and adjusting roller 78 can in particular be displaced relative to one another in such a way that a detaching angle 79 can be set. Adequate tension in the band 69 can be ensured by compensating rollers, which are not shown here. Binder, which is not shown in more detail here, takes place, for example, after the first layer 74 has been detached from the detaching roller 77 .

Figure 8 shows a preferred solution. Shown in a schematic view is a seventh device 80 for producing a suction layer, which has a hollow roller 81 with variable suction openings 82 . The suction opening 82 extends over an angular range 83 . This angular range 83 can be set by displacing first locking segments 84 and second locking segments 85 mounted in the hollow roller 81 . The first locking segments 84 as well as the second locking segments 85 are each connected to one another, so that an inner cylinder is rotatably arranged in the hollow roller 81 . The inner cylinder with locking and suction segments rotates, while the remaining elements are preferably fixed.

The open angular range 83 can be changed by adjusting the first and second locking segments 84 , 85 . A connection is made between a discharge line 86 and a suction 87 along the open angle region 83 . In this way, it is possible to control how much suction medium 88 is drawn off from a first layer 89 . The type of suction can also be influenced, for example, via the pressure 90 applied , over a length 91 of the discharge line, over a length 92 of the suction 87 , over a distance 93 between the suction means 88 and a suction opening 94 of the suction 87 , their geometries and other parameters , Furthermore, the suction behavior is determined by the geometry of the suction opening 94 , by the formation of a possible pulsation, by the configuration of the conveyor belt 95 for the first layer 89 and further parameters. As shown here, the conveyor belt 95 has openings 96 . It is preferably a sieve belt. The openings 96 facilitate air passage through the first layer 89 and thus suction of the suction means 88 . The device 80 allows the suction to be adjusted. By changing, for example, the speed of rotation of the hollow roller 81 as a function of the belt speed or the segment setting in the inner cylinder, the device 80 can be adapted to different suction medium lengths, widths and production speeds. The speed of the inner cylinder is determined from a reciprocal value, which is formed from the number of segment pairs multiplied by an interval time. The interval time specifies the ratio of a length of the absorbent added by a length of an absorbent-free point adjoining it in the direction of belt movement in relation to the belt speed.

FIG. 9 shows an example of a larger section of a device 97 for producing a suction layer. The seventh device 80 shown in FIG. 8 can be integrated into this device 97 , for example. A first layer 99 is fed from a first unwind station 98 and a second layer 101 from a second unwind station 100 for further processing. It is also possible to run an in-line process for producing the unwound layers instead of a first and second unwinding station 98 , 100 . This means that the material of the first or second layer 99 , 101 is produced directly before further processing. On the first layer 99 a Saugmittelschicht is applied to the first layer 10 via a 99 Saugmittelzuführeinrichtung 102nd The suction medium supply device 102 is connected to a mixing unit 103 . The mixing unit 103 , for example a rotary mixer, is in turn connected to storage containers 104 . Different materials for the absorbent layer are stored in the storage containers 104 , for example, which are mixed in the mixing unit 103 in accordance with a predefinable recipe and applied as the absorbent layer 10 via the absorbent supply device 102 . For example, superabsorbers, cellulose, binders, additives, odorants, zeolites, fiber material, alone or as a mixture, can be present in the storage containers 104 . Further, usually usable materials can also be stored in the storage containers 104 alone or as a mixture. Another advantage of the arrangement of one or more storage containers is that the continuous process can be continued without interruption for refilling correspondingly suitable material by switching the supply line from one storage container to the other. After the absorbent layer 10 has been applied to the first layer 99 , these are fed to the seventh device 80 . There the suction material is partially removed from the first layer. In addition to suction, there are also other possibilities, such as, for example, mechanically wiping off part of the absorbent layer 10 . In order to be able to set a uniform suction pressure during suction, this is regulated, for example. Throttling, in particular a bypass solution, can be used for this purpose. By means of the bypass solution, in particular a partial air flow is intentionally generated, which is used to facilitate the conveyance of powder to a cyclone 106 . There is also the possibility of designing the vacuum generation unit 105 , for example a fan, in a speed-controlled manner. According to one embodiment, the suction material sucked off is separated from the suction air flow, for example by a separating device, represented here by the cyclone 106 . After appropriate treatment, the suction material recovered in this way is returned to the cycle.

After suction material has been sucked off from the absorbent layer 10 in accordance with the embodiment according to FIG. 9, the first layer 99 is guided into a heating section 107 . Due to the heat transfer occurring there, for example when polymer material is fed into the suction means 72, the latter is softened, if not caused to melt. As a result, the grains of the absorbent material stick to one another and form a stable absorbent layer on the first layer 99 . Corresponding heating furthermore leads to the absorbent layer adhering to the surface of the first layer 99 . In the case of a modification of the device 97 ( not shown in more detail here), heating takes place by means of a heating section 107 before the suction layer 10 is partially removed from the first layer 99 . The removal is preferably produced in particular by means of mechanical action. For this purpose, for example, a correspondingly shaped roller or surface, which is guided, for example, by a circulating belt, pierces the absorbent layer 10 and removes it in a desired area. A pre-hardened absorbent layer 10 has the advantage that forces which act on this layer can be greater before an undesired disturbance of the other areas of the absorbent layer occurs.

A heating device 107 in FIG. 9 is followed by a first binding device 108 and a second binding device 109 . A first binder is applied via the first binder device 108 in the direction of movement of the first layer 99 and, due to its transverse arrangement, leads to a longitudinal sealing between the first and second layers 99 , 101 in the further course. For this purpose, the first binder is applied in a space that is preferably free of absorbent. A second binder is applied to the first layer 99 via the second binder device 109 . The second binder is applied in such a way that it subsequently leads to a transverse sealing in the case of a suction layer 110 . The first as well as the second binder can be sprayed on, applied by direct contact of an application head or applied in some other way to the first layer 99 . A further possibility of applying the second binder is to wet the second layer 101 accordingly. For example, this can be done with a roller provided with application surfaces as the third binder device 111 . According to a development, the surface of the third binder device 111 has elevations which are wetted with a binder at a rotational speed which is synchronized with the movement of the first layer 99 . The binder is then applied to the surface of the second layer 101 . In particular with this solution, there is the possibility that the third binder device 111 is in constant contact with the second layer 101 .

The first layer 99 and the second layer 101 are formed after the application of the binder or binders with the absorbent layer 10 arranged between them via a pressure unit 112 , in this case a calender, to form a suction layer 110 . The calender can be structured at least on one roll surface. The structure has the task, for example, of shaping the absorbent layers and / or of sealing the absorbent layers. In accordance with the configuration shown here, the suction layer 110 can be stored via a winding device 113 . Furthermore, according to a further development, there is the possibility of directing the suction layer 110 directly into a further processing device in which the suction layer is divided apart, for example transversely as well as transversely to individual suction packs. The individual absorbent packs, which are not shown in more detail here, are then used in products such as, for example, hygiene articles, wiping cloths, oil absorbent cloths or others.

FIG. 10 shows a schematic longitudinal view through the hollow roller 81 from FIG. 8. The hollow roller 81 has a bearing 114 for its inner hollow core 113 , via which a vacuum for the suction 87 is made available. The bearing 114 is arranged, for example, on the first face 115 and the second face 116 . A connection 117 to the vacuum generation unit (not shown in more detail) is established via a rotating leadthrough 118 that rotates, for example. The rotating union 118 is gastight, so that no leakage occurs when the negative pressure is transmitted. So that the same negative pressure is present at all times over a length 119 of the hollow roller, the inner hollow core 113 preferably has valve-like internals, so that a minimum negative pressure occurs uniformly after the suction has been opened and the suction material has been removed. In this way, absorbent layers 10 can be produced, which can have any length 120 , for example between 45 mm and 181 mm. Longer layers of absorbent can be easily produced. A distance 121 in the longitudinal direction between absorbent layers can be set continuously. It is preferably between 60 mm and 25 mm. A width 122 of the absorbent layers can be set as desired and is, for example, between 6 mm and 50 mm. Exact dimensions of the absorbent layers depend on various parameters. The later intended use in the product, the production speed, the materials used and their thickness have an influence. For example, layers of absorbent can be arranged continuously over a width 123 of the first layer of 100 cm and more. The specified dimensions can also be achieved using the other devices and methods.

FIG. 11 shows a further embodiment of a suction, wherein a suction channel 124 is used, which can be used, for example, in a device according to FIG. 9. The suction channel 124 , which has a length 125 of between 200 mm and 800 mm, for example, is arranged over a first layer. The suction channel 124 is connected to a vacuum supply line 126 . The vacuum line 126 has a diameter 127 , for example. The suction channel 124 in turn has a height 128 . The height 128 of the suction channel 124 is preferably greater by a factor of 1.5 to preferably 4 than the diameter 127 . The length 125 of the suction channel 124 is in turn preferably longer by a factor of 1.1, in particular by a factor of 1.3 and more, than the width 129 of the first layer used. The pressure prevailing in the suction channel 124 or via the vacuum supply line 126 is also controlled via a solenoid valve. This allows rapid opening and closing in a range of less than 0.5 s, in particular in a range between 50 ms and 4 ms.

Fig. 12 is a schematic view showing an example of a suction port 130th In the embodiment shown, a mask 132 is arranged over the absorbent layer 10 and thus over the first layer 131 . The mask preferably forms an aperture and, with its gap 133 , prevents more material of the absorbent layer 10 from being removed during suction than is necessary. The mask allows a precise separation between areas to be extracted and areas not to be extracted, in particular by preventing incorrect flow due to air flow from the environment. Furthermore, in a further embodiment, the mask 132 allows a certain pressure, for example a negative pressure or a mechanical pressure, to be exerted on the absorbent layer 10 . The gap 133 is preferably somewhat smaller than the suction opening 130 . In other configurations, however, the gap 133 can also be larger. The suction opening 130 can in turn be conical, the inside diameter 134 being able to increase or decrease in the direction of flow. This depends on whether a high or lower suction speed is to be achieved directly on the absorbent layer 10 .

Fig. 13 shows a further device for producing an absorbent layer. According to this device, a hollow roller 135 is used again. An inner hollow roller 136 is arranged in this hollow roller 135 . The inner hollow roller 136 has a suction channel 137 , through which suction openings 138 of the hollow roller 135 can be subjected to negative pressure. For this purpose, the hollow roller 135 rotates around the inner hollow roller 136 . A first counter roller 139 and a second counter roller 140 are arranged opposite the hollow roller 135 . Hollow roller 135 , first counter roller 139 and second counter roller 140 are preferably arranged in such a way that the first layer 141 , on which there is a layer of absorbent 10, is displaced against the counter rollers 139 , 140 . This creates a compressive force on the absorbent layer 10 . This preferably removes only material from the absorbent layer 10 which is also arranged directly opposite an intake opening 138 . The pressure which is exerted by the position from the hollow roller 135 to the two counter-rollers 139 , 140 can be adjusted, preferably by shifting the position of at least one of these three rollers. In order to avoid that at a surface of the hollow roller 135 is supported absorbent material adhering to the hollow roller 135, a cleaning device is arranged on the hollow roller 135 142nd This can clean the surface of the hollow roller 135 , for example by means of mechanical action, by compressed air or other possibilities. The material falling in this way is collected and removed via the cleaning device 142 . The surface of the hollow roller 135 can also be coated, so that the tendency to adhesion is extremely reduced, particularly with respect to granular materials. A binder feed device 143 is arranged downstream of the cleaning device 142 . A binder can be applied to the first layer 141 partially or over the entire surface thereof.

Fig. 14 shows a further embodiment of an apparatus for making a wicking layer. This device shows by way of example that such a device for producing a suction layer and in particular a partial application of suction medium can also be retrofitted into an existing system. As indicated schematically, the construction of the device is compact in a frame. If there is sufficient space within a system, the device can therefore be subsequently used as a module. Absorbent material 146 is applied to a first layer 147 via a circumferential belt 144 which has openings 145 . The band 144 has webs 148 which are in contact with the first layer 147 . The webs 148 partially cover the surface of the first layer 147 . The suction material 146 is distributed over the belt 144 to the first layer 147 via a suction material feed 149 . The material coming to rest on the webs 148 is distributed to a desired height by means of a distribution device 150 , for example a brush, a scraper or the like. The belt 144 is then lifted off the first layer 147 and the absorbent layer 10 located thereon at a slight angle of inclination 151 . The angle of inclination 151 is preferably between 5 ° and 35 °. The belt 144 is then cleaned of any adhering particles by a cleaning device 152 . The cleaning device 152 can use suction or ultrasound, for example. In order to collect particles falling off the belt 144 , a collecting device 154 is arranged in the region of the deflection 153 . Otherwise, the absorbent layer 10 can be compressed in this device as in the previously described ones, for example by exerting pressure by means of rollers or also by exerting pressure via the distribution device 150 . A further possibility of compaction results from a corresponding vibration compaction. A corresponding vibration can be generated, for example, by means of ultrasound.

Fig. 15 shows a further embodiment of an apparatus for making a wicking layer. This device can also be retrofitted as a module into an existing system. A suction belt 156 runs around four guide rollers 155 . The flexible suction belt 156 is preferably laser-cut and preferably has cutouts 157 which preferably run transversely to the direction of travel of the suction belt 156 . According to an embodiment not shown here, the suction belt 156 has cutouts 157 which are neither transverse to the direction of travel nor parallel to it, but rather at an angle to it. There is also the possibility that the cutouts 157 not only have edges running parallel to one another, but rather also have curves, that is to say have concave or convex shapes. This applies not only to recesses in a suction belt 156 . Rather, such a geometry can be found mirror-inverted in the absorbent layer 10 on the first layer 158 . As a result, not only a rectangular cross section can be achieved with the absorbent layer 10 for different purposes. Rather, such a design also allows geometric shapes such as, for example, a water meter-like longitudinal distribution of absorbent material, conical, convex and other shapes. The suction belt 156 is guided onto the absorbent layer 10 . The material of the absorbent layer 10 which is adjacent to the cutouts 157 is removed via a suction device 158 . The suction device 158 can be constructed from one part or, as shown here, from two or more modules. Furthermore, the suction device 158 can completely cover the suction belt 156 over an entire area. There is also the possibility, as shown here, that the suction is carried out in two separate areas. Downstream of the suction device 158 is a take-off roller 159 , here configured as a grooved roller. This, in interaction with the upstream guide roller 155 of the suction belt 156 located in this intermediate section, results in the possibility of applying a contact pressure via the suction belt 156 to the first layer and thus also to the intermediate layer 10 of the absorbent. The suction belt 156 is lifted from the take-off roller 159 at a small angle by means of a subsequent guide roller 155 from the absorbent layer 10 . The suction belt 156 is cleaned, for example, using a brush roller 160 shown here. This cleaning device can be supported by further cleaning, for example by means of ultrasound and / or suction. In addition, a vibrating plate 161 is assigned to the guide roller and the brush roller 160 . The vibrating plate 161 firstly catches the particles falling from the suction belt 156 . On the other hand, with a suitable suspension, it is also able to serve as a vibrating plate for the passing suction material on the first layer 162 . A binder feed device 163 is arranged downstream of the vibrating plate 161 . The binder 164 supplied is, for example, a binder which only melts at high temperatures.

Fig. 16 shows a schematic view of an absorbent layer 165th The suction layer 165 has four suction pads 166 , wherein the suction pads 166 preferably have a structure of a first layer 167 , a suction layer 168 arranged in between and a subsequent second layer 169 . However, the absorbent pads 166 can also have a plurality of such structures one above the other or have a plurality of layers of absorbent. This is possible, for example, by folding the absorbent layer 165 over or coating it several times. Furthermore, the suction pads 166 are provided with a transverse seal 170 as well as with a longitudinal seal 171 . The transverse seal 170 as well as the longitudinal seal 171 are preferably continuous, that is to say continuous. According to a further development, the transverse seal 170 or the longitudinal seal 171 are interrupted individually or together in some cases also at defined points.

Furthermore, a detection unit 172 is shown schematically in FIG. 16. A sensor 173 is able to actively or passively record a signal from the suction position 165 , which can then be evaluated by the detection unit 172 . The recorded signal can, for example, provide information about a sectional plane, for example for a cross section, but also for a longitudinal section through the suction layer to separate the suction pads 166 . For this purpose, the absorbent sheet can have markings such as grooves, colored markings or the like. There is also the possibility of detecting an elevation of the suction layer 165 , so that it is possible to determine where a suction layer 168 is located and in which area it is not. Furthermore, it is possible to draw conclusions about the distribution of the absorbent layer 168 and subsequently to obtain corresponding information by illuminating the absorbent layer 165 and then carrying out a light-dark comparison, for example by evaluating recordings of a CCD camera. According to a further development, the applied binder is detected by means of the detection unit. In addition, the detection unit 172 just mentioned and the various types of detection are not only applicable for making cuts through the suction layer 165 . Rather, there is also the possibility, for example, of checking the position of the suction layer 165 within or at the beginning of further processing, for example in the case of deposition by means of a packaging unit in a transport form or also a processing system for producing the end product. As shown, besides the possibility of arranging the absorbent layers not only parallel but also alternating with respect to their transverse sealing. That allows

Furthermore, the invention enables the individual suction layers to be separated from one another a form of transport. The individual suction pads can then in one Processing station can be installed specifically in or on the end product. For example, in the area of hygiene and incontinence, there is the possibility the suction pads according to the gender-specific location of the genitals position differently in a diaper, for example.

The proposed method as well as the devices are for processing suitable for a wide variety of materials. As first and second layer for example weaving materials as well as paper, non-woven fabric, especially airlaid Materials, film or other thin-surface materials as well as one or more layers Suitable material mixtures. SAP, black carbon, Zeolite used alone, in mixtures, mixed with polymer or other materials. In particular, according to the invention, the suction pads that can be produced are can be used, for example, in the following applications: hygiene articles such as for example bandages, diapers or suction pads for weaning in the case of nursing mothers, Incontinence items such as absorbent pads, food technology, for example at Meat pads and food packaging, absorber pillows, in particular for industrial products such as oil suction, liquid suction, in particular Leakage fluids, still for wash bags, can be used in washing machines for example, have odorants or detergents, can be used for medical needs, for blood-absorbing materials such as in operating rooms, for covers, cleaning materials for operating rooms and surgical clothing, for Clothing, clothing cleaning agents overall, can also be used at  Washcloths, towels, hand towels, wipes, in the household, for transportation Food, for frozen goods, for goods that show loss of liquid can, as barriers to plug holes by swelling, in Building constructions, for protection against moisture ingress, in particular also for storing moisture in the ambient air, for example in the Dry storage of electronic components or optical devices, as Underlay as well as a cover.

Claims (17)

1. A method for the continuous production of a suction layer ( 165 ) with at least one absorbent layer ( 10 ), a first layer ( 167 ) being fed to a second layer ( 165 ) and the absorbent layer ( 10 ) being applied to the first layer, characterized in that that before arranging the second layer on the absorbent layer ( 10 ) and the first layer, a part of the absorbent layer ( 10 ) is removed from the first layer, wherein separately arranged absorbent layers are produced, and then a connecting means ( 164 ) transverse to a direction of movement the first layer ( 167 ) is arranged at least in strips between separate layers of absorbent to create a transverse seal ( 170 ) of the absorbent layer. 2. The method according to claim 1, characterized in that by means of a first binder means a first binder in the longitudinal direction Generation of a longitudinal seal is applied to the first layer and on the second layer by means of a second binder device second binder is applied to produce the transverse seal upon contact of the second binder with the first layer. 3. The method according to claim 1 or 2, characterized in that a longitudinal seal ( 171 ) of the suction layer ( 165 ) is continuously generated to the transverse seal ( 170 ). 4. The method according to claim 1, 2 or 3, characterized in that at least part of a seal is generated mechanically, the Connection means a mechanically acting connection between the forms the first and the second layer.   5. The method according to any one of the preceding claims, characterized characterized in that an adhesive at least partially on the second layer is applied, the following the first carrying the absorbent layer Location is fed. 6. The method according to any one of the preceding claims, characterized in that the connecting means ( 164 ) is arranged at least partially discontinuously. 7. The method according to any one of the preceding claims, characterized in that the first ( 167 ) and the second ( 169 ) layer are cut only after a complete sealing of the absorbent layer ( 10 ). 8. The method according to any one of the preceding claims, characterized in that the individual, separated and sealed absorbent layers ( 10 ) are deposited and are further processed. 9. The method according to any one of the preceding claims, characterized in that completely sealed and spaced apart absorbent layers ( 10 ) are stored contiguously and then fed to further processing in which the sealed absorbent layers ( 10 ) are at least partially separated from one another. 10. Device ( 97 ) for the continuous production of a suction layer ( 110 ), the device ( 97 ) having at least a first feed for feeding a first layer ( 99 ), a second feed for feeding a second layer ( 101 ) and a suction medium feed, in order to arrange at least one layer of absorbent in between, characterized in that a suction device is arranged to extract suction means at defined points from the first layer ( 99 ) in order to generate interruptions along a suction means path. 11. Device for the continuous production of a suction layer ( 165 ), wherein the device has at least a first feed for feeding a first layer ( 147 ), a second feed for feeding a second layer and a suction medium feed in order to arrange at least one layer of suction medium ( 10 ) therebetween , characterized in that at least one web ( 148 ) can be applied transversely to a direction of movement on the first layer ( 147 ) in order to form a boundary surface for the suction medium to be applied, the web ( 148 ) being designed such that a surface on the first Layer ( 147 ) is kept free so that the surface can subsequently form part of a transverse seal ( 170 ) of a suction layer. 12. Device for the continuous production of a first absorbent layer ( 110 ), the device having at least a first feed for a first layer ( 99 ), a second feed for a second layer ( 101 ) and a suction medium supply, the suction medium supply having a layer of suction medium ( 10 ) is arranged on the first layer ( 99 ) before the second feeder feeds the second layer ( 101 ) to the first layer ( 99 ), characterized in that a binder device ( 111 ) for producing a transverse seal to the second feeder is arranged in such a way that a binder can be applied to one side of the second layer ( 101 ), which is then connected to a side of the first layer ( 99 ) on which a layer of absorbent ( 10 ) is applied. 13. The device ( 97 ) according to claim 10, 11 or 12, characterized in that a placement device is connected downstream, which receives individual or interconnected, completely separated from one another by complete sealing absorbent layers. 14. The device ( 97 ) according to one of claims 10 to 13, characterized in that the device, in particular a storage device, has detection means by means of which sections of the suction layer with and without a layer of absorbent can be distinguished. 15. suction layer ( 165 ) with at least a first layer ( 167 ), a second layer ( 169 ) and a suction layer ( 168 ), which is arranged between the first layer ( 167 ) and the second layer ( 169 ), characterized in that a transverse seal ( 170 ) at least partially has a different binder than a longitudinal seal. 16. Suction layer according to claim 15, characterized in that a force to be destroyed to destroy a transverse seal ( 170 ) is greater than the force to be applied in a longitudinal seal ( 171 ) or vice versa. 17. suction layer ( 165 ) according to claim 15 or 16, characterized in that it has a marking means by means of which a cutting line can be detected.