EP2392452B1 - Method and device for the production of tubes or tube sections - Google Patents

Description

The invention relates to a device for producing hoses or hose sections, from which bags can be produced, wherein the hoses or hose sections comprise at least one material layer, preferably a paper layer, according to the preamble of claim 1.

The starting material for sacks, preferably paper sacks, is usually provided as webs wound on rolls. In the device mentioned above, hoses or pieces of hose are then produced from one or more webs by unwinding the web in an unwinding device and then applying a glue application in an edge region (longitudinal sizing). This purpose is a glue disc. This is done in a device for providing at least one edge region with glue. Glue is used here abbreviated and means all sorts of glue. After the glue application, the two edges of the web in the hose forming device are turned over so that the edges overlap and the glue application connects the overlapping edges. A hose machine and a device for providing at least one edge region with a glue, in which a glue disk is provided, are in the document DE 10 2007 032 401 A1 disclosed.

Subsequently, the tube thus formed is usually isolated, which is done either by a smooth cutting knife or in a tear-off, in the Hose pieces are torn off the hose, wherein weakening lines, for example perforations, are introduced into the web before the glueing.

The pieces of tubing are now processed into sacks in a separate device.

Often, paper sacks consist not only of one but of several layers. For example, building material sacks consist of an outer and an inner layer of paper and an intermediate (plastic) film layer. In order to increase the mechanical strength of these bags, the individual webs are arranged slightly offset, so that each individual web can be provided with a longitudinal sizing and then each web can be connected to itself.

Such bags are sufficiently strong. However, a problem arises when such bags are filled. In the filling process, air is introduced, which must be able to escape from the bag, otherwise it could burst. In order to allow air to escape, hoses or hose pieces in the hose machine are provided with air-permeable channels. This is done by providing the individual webs with perforations that are sufficiently small so that only air and no product can escape. For this purpose, needle roller assemblies are used for example in the DE 195 44 330 A1 presented. The individual webs are arranged so that the respective perforations are offset from each other to allow the escape of air, but to prevent the discharge of the bottled product. With single-layer hoses, such a venting perforation is not possible because then the product also emerges.

The perforation by needle rollers is very expensive. For one, the structure and thus the selling price of such a device is relatively high. On the other hand, if the perforation is desired to change, either the needles of the roller must be exchanged or the needle roller itself exchanged.

The US 2004/0184680 A1 discloses hoses comprising inlaid gussets. At one of the inner folds, the tube folded from a material web is joined together by means of an interrupted connecting track. However, such a single interconnect track with interrupts can not prevent product leakage.

The object of the present invention is to propose an apparatus and a method with which the air-permeable, but product-impermeable channels can be produced in a simpler manner.

The object is solved by the preamble of claim 1 and by its characterizing features.

Accordingly, it is provided that the device for providing at least one edge region of each material web with glue comprises glue application valves, wherein each material web is assigned at least two glue application valves. Each of these glue valves can now apply a so-called glue bead to the edge area of a material web. The advantage of a glue valve is that it can be switched so that the glue application can be interrupted. There are now broken glue marks. The interruptions form air-permeable channels. Such a glue application was not possible with the previously used glue discs.

The at least two glue valves, which are associated with a material web, can be supplied with feed via supply lines. However, it is conceivable and advantageous, zuzuleiten these glue valves two different types of glue. At least one valve can be acted upon, for example, with a dispersion adhesive, which dries quickly and thus allows a quick bonding of the edges. At least a second valve can be acted upon, for example with a starch glue. This dries comparatively slowly, but offers a very high strength. By combining different types of adhesive so immediate durability and high strength can be achieved at the same time, which was previously not possible.

By the invention can now be dispensed with the needle rollers, so that a portion of the acquisition and operating costs is eliminated. With regard to the operating costs, it is positive that when changing the product, only the time control of the valves has to be changed. A positioning of a another needle roller or even changing or replacing a needle roller deleted.

Even with single-layer hoses ventilation channels can be generated in this way. This was not possible with prior art devices.

It is particularly advantageous if each material web is assigned at least one nozzle plate which is associated with at least two glue application valves assigned to this material web. The assembly, comprising at least one nozzle plate and optionally the glue valves, is particularly easy to replace. The glue application valves can be attached to a nozzle head, this nozzle head also carries the nozzle plate. This possibility represents an interesting aspect of the invention, since a nozzle plate, starting from each valve, can have a glue outlet opening, wherein the glue outlet openings can occupy a fixed distance transversely to the transport direction of the material web relative to one another. If this distance is to be changed, the nozzle plate can simply be exchanged for this purpose.

A further, advantageous embodiment of the invention makes it possible for the at least one nozzle plate to be displaceable relative to the machine frame. In this way, the positions of the glue application valves can for example be adapted to the width of the material webs. This is particularly advantageous if the center axes of the material webs, regardless of their width, always remain at the same position.

In a further embodiment of the invention, at least two nozzle plates are provided, which are displaceable relative to each other. The displacement direction preferably extends transversely to the transport direction of the material webs. Each material web is assigned a nozzle plate. If the lateral spacing of the edges of the material web is changed, the nozzle plates can also be displaced relative to one another, so that the glue application always takes place close to the edge.

• Leimauftragsposition
• Spül- und Wartungsposition
• Serviceposition.

It is furthermore advantageous if at least two of the following positions are provided, into which the glue valves and / or the nozzle plates can be brought, preferably pivoted:

• Leimauftragsposition
• Rinsing and maintenance position
• Service position.

In the glue application position, the glue exit orifices of the nozzle plates or the glue application valves are directed against the web as it passes over a backing such as a roller. Naturally, the openings, which are particularly prone to contamination, are difficult to access in the glue application position. Therefore, it is provided to store the glue application valves, for example pivotally, in the machine frame. Swinging it into a rinsing and maintenance position facilitates access to glue-bearing components. In particular, the glue outlet openings can now be directed onto a collecting trough, which can catch and discharge the contaminated flushing liquid during a flushing process. However, since the access to the nozzle plates is difficult even in the rinsing and maintenance position, a service position may additionally be provided, in which, for example, the nozzle plates are interchangeable.

In a further advantageous embodiment of the invention, a computing and control device is provided which controls the opening and closing operations of the glue application valves. It is particularly advantageous that so the opening and closing times are variable within a later piece of hose. For example, it is possible to dispense with interruptions of the glue traces in the area of the subsequent floors. This measure can increase the strength of the bags.

In a further embodiment, the opening and closing times of the glue application valves can be calculated with the computing and control device from a predeterminable appearance of the air-permeable channels. The appearance of these channels may be the computing and control device over a suitable Data exchange path. Even a direct input, such as a touchscreen display, is conceivable.

Fig. 1

eine schematische Seitenansicht einer Schlauchmaschine zur Herstellung von Schlauchabschnitten nach dem Stand der Technik

Fig. 2

eine erfindungsgemäße Vorrichtung zur Erzeugung von Schläuchen oder Schlauchabschnitten

Fig. 3

Ansicht III - III aus der Figur 2

Fig. 4

Ansicht IV - IV aus der Figur 2

Fig. 5

eine weitere Ausführungsform der Erfindung

Further embodiments of the invention will become apparent from the description and the claims.
The individual figures show:

Fig. 1

a schematic side view of a hose machine for the production of tube sections according to the prior art

Fig. 2

a device according to the invention for the production of hoses or hose sections

Fig. 3

View III - III from the FIG. 2

Fig. 4

View IV - IV from the FIG. 2

Fig. 5

a further embodiment of the invention

The FIG. 1 shows a schematic side view of a so-called hose machine for the production of hose sections, which serve as semi-finished products of the production of sacks. This tube machine consists in the illustrated embodiment of three unillustrated settlement points, in which successively arranged web rolls 1, 2, 3 are supported, of which via guide rollers and unwinding and / or deduction flat webs 4, 5, 6 are deducted. In practice, for example, the webs 4 and 6 made of paper and the web 5 made of plastic. In a machine frame, not shown, perforation cylinders 8, 9, 10 preferably provided with their own drives are mounted in a perforating station 7, whose perforating knives 11 cooperate with counterblade cylinders 8 ', 9', 10 '.

In the direction of the mutually spaced distance guided tracks are provided behind the Querperforierzylindern 8 to 10 provided with drives Querklebezylinder 12, 13 in the machine frame, the transverse adhesive strips provided the paper webs 5 and 6 with transverse adhesive orders. The transverse adhesive strips 14 of the transverse adhesive cylinders 12, 13 receive their adhesive jobs in the usual way of adhesive application rollers. To bond three webs together, are only two Querklebezylinder necessary. A transverse bonding is usually done so that the individual layers do not move against each other in the manufacture of bags when folding areas of the hose pieces.

Behind the cross-slip cylinders 12, 13, the paper webs 4, 5, 6 are brought together for their bonding to form a multilayer web 15. An edge region of the multilayer web, on which the individual webs are laterally offset from one another (that is to say are displaced in the transverse direction relative to one another), is provided with adhesive layers forming the subsequent longitudinal seams by longitudinal adhesive rollers 16 configured as glue application disks. Each layer is assigned a Längskleberolle. The longitudinal adhesive rollers receive their adhesive jobs in the usual way by an adhesive application roller or scoop roller, not shown. Furthermore, a counter-roller 17 is provided, on which the multilayer web 15 is supported when it is provided with the longitudinal adhesive.

The prepared in the manner described multilayer web is then folded in a tube forming device 18 to a tube 22, wherein the respective overlap-free edge regions of the individual layers stick together.

In the tear-off station 19, individual tube sections 20 are then torn from the tube by the paper tube. The tear-off station is provided with a conventional tear-off, comprising two rollers driven at different peripheral speeds, of which the front forms a retaining roller and the rear a tear-off, with the tearing of the individual sections 20 by a cammed roller 21 in a movable Carrier mounted counter-rollers are pressed against the retaining and Abreißwalzen.

The FIG. 2 now shows a device according to the invention for the production of hoses or hose sections. In comparison with the device according to FIG. 1 now the longitudinal adhesive discs 16 have been replaced by a device for providing the edge region of each material web with glue. These Glue applicator 30 includes a plurality of glue application valves 31, which release the glue flow to the material webs or can interrupt this glue flow, which will be explained in more detail with reference to the following figures. The glue application valves receive the glue via various feed lines, of which the glue tube 32 is shown, which is fed via a pump with glue from a glue reservoir. Other supply lines are provided, but not shown in detail. The glue application valves 31 are distributed on one or more nozzle plates 33, in which non-visible glue channels, which open into glue outlet openings, are incorporated. The nozzle plate 33 is arranged on a support body 34, which in turn is connected in a suitable manner with the machine frame, not shown. For example, the support body 34 may be arranged on a rod 35 about which it is pivotable. The tilted position is shown by a broken line. In this pivoted-off position, the so-called rinsing position, the glue application valves 31, the glue channels and other glue line components can be flushed through with a suitable cleaning agent, often water. The cleaning agent can be collected and discharged with the tub 36. It is conceivable that the support body (not shown) is pivotable even further in a service position, so that components of the glue application device 30 are more accessible. It may be desirable, for example, to exchange the nozzle plates 33 with others in which the distance of the glue outlet openings is changed transversely to the transport direction of the material web.

The FIG. 3 Now shows the view III - III from the FIG. 2 , First, the multilayer material web 15, which consists of the individual material webs 4, 5 and 6. The individual webs are offset from each other in the direction x transverse to the transport direction R, that is, they are each offset in the direction x against each other, so that the edges of the otherwise covered webs are free. This makes it possible to provide the free edges with a longitudinal sizing. Each material web is also provided with transverse perforations 74, 75, 76 which each extend in the direction x and along which the tube is singulated into pieces of tubing. In the exemplary embodiment shown, the perforations of the individual material layers are in Direction R shifted from each other. Alternatively, superimposed perforations or smooth cuts, which can be generated after the tube formation, are common.

Each material web are each assigned two glue valves 31, with which glue tracks of different characteristics can be designed. For this purpose, each glue valve supplies a glue channel 37, which opens into one or more glue outlet openings 38.

Various glue trace patterns are now shown. The material layer 4 has two glue tracks 41 and 42, each comprising glue track sections 43, 45 and interruptions 44 and 46. The glue tracks 41 and 42 may be a fixed distance apart, for example 10, 15 or 20 mm. The glue trace portions 43 and 45 are each the same length and are interrupted by comparatively shorter interruptions 44 and 46. The glue trace portions 45 and the breaks 46 are shifted in the direction R, so that each glue trace portion 43 completely covers an interruption 46 and also overlaps with the glue trace portions 45 adjacent to the break 46. Thus, a so-called labyrinth vent can be created in a simple manner, through which the air in the filling or located during filling of the subsequent bag air can escape through which but no or only slightly exiting from the contents.

The glue tracks 61, 62 are quite similar to the glue tracks 41 and 42. Here, the length of the glue trace portion 63 corresponds to the length of the break 66 and, conversely, the length of the break 64 corresponds to the length of the glue trace portion 65.

The glue tracks 51 and 52 differ markedly from the above described glue track pairs 41, 42 and 61, 62. The glue track sections 53 and 55 now each have a varying length and not always the same length. The interruptions 54 and 56, however, are shown as always the same length, but can of course also vary in length. From the glue application valves, the first have Leimspurabschnitte 53 and 55 a comparatively long length. This area can later form the lower part of a bag. Thus, the necessary during filling strength of this section is given. The air can escape through the further upstream interruptions 54 and 56. In the area of the perforation 75, however, the glue line is interrupted, so that after the demolition of hose sections, no glue can escape from the ends thereof and possibly contaminate machine parts.

Line 77 shows a possible air flow through the glue tracks. The glue tracks shown are all conceivable embodiments. The number of possible embodiments is of course infinitely great, but they are all within the scope of the present invention. The number of individual material webs is variable, even if only three layers are mentioned on the basis of the figures. Also the number of glue traces in the FIG. 3 in each situation with two given, can be larger. For this purpose, a correspondingly larger number of glue application valves may be provided and / or each glue application valve is assigned a plurality of glue outlet openings.

Also, the types of glue that make up the glue tracks can be different. Thus, in the case of a material layer or web, a first glue trace may consist of a fast-setting adhesive, such as a dispersion adhesive, whereas a second glue trace may consist of a very strong but slowly setting adhesive, such as starch glue. Of course, the glue traces of different types of adhesive also form venting channels.

Different types of materials could also be applied with different types of adhesive. Paper layers, for example, could be coated with starch glue and plastic layers with a hot melt adhesive. Even the arrangement of a single sheet of material could play a role in the choice of the type of adhesive. An outer material layer could be provided with a fast-setting adhesive, whereas inner layers of material could be acted upon by a very firm adhesive. In all these cases would have to the individual glue application valves are optionally applied with different types of adhesive, which certainly means a slightly higher installation costs, but technically represents no problem.

The FIG. 4 shows another aspect of the present invention. There is a nozzle plate 33 is provided, on which all glue application valves 31 are fixed. The nozzle plate 33 itself is firmly connected to the support body 34. This may for example comprise a carriage, not shown, which runs on a rail which is directed in the direction x. For the purpose of lateral displacement, an electric motor 39 is now provided, which is supported on the machine frame and rotatably drives a spindle 40. The spindle 40 is screwed into a threaded bore of the support body, so that their rotational movement opens into a lateral movement of the support body and thus also the glue application valves. In this way, nozzle plate 33 and glue application valves 31 can be adapted to the position of the edges of material webs.

The FIG. 5 shows a further embodiment of the invention. Here, each individual material web is assigned its own nozzle plate 33, 57, 67. Each nozzle plate carries in this example two glue application valves 31. The nozzle plates are each movable relative to each other, so that the positions of the nozzle plates are adaptable to an optionally changed offset of the webs 4, 5 and 6.

All figures show various embodiments of the invention. The exemplary embodiments shown in these figures and also those otherwise described in the present application can be combined with one another as desired and thus represent further advantageous embodiments of the invention. LIST OF REFERENCE NUMBERS 1 paper roll 2 paper roll 3 paper roll 4 paper webs 5 paper webs 6 paper webs 7 perforating 8th perforating 9 perforating 10 perforating 8th' Counter-blade cylinder 9 ' Counter-blade cylinder 10 ' Counter-blade cylinder 11 perforating 12 Cross bonding cylinder 13 Cross bonding cylinder 14 Cross-adhesive strips 15 multilayer track 16 glue spreading 17 Impression cylinder 18 Hose educational institution 19 Abreißstation 20 Single tube sections 21 Cammed roller 22 tube 23 24 25 26 27 28 29 30 adhesive application 31 Leimauftragsventil 32 Leimschlauch 33 nozzle plate 34 supporting body 35 pole 36 tub 37 glue channel 38 glue outlet 39 electric motor 40 spindle 41 glue line 42 glue line 43 Leimspurabschnitt 44 interruption 45 Leimspurabschnitt 46 interruption 47 48 49 50 51 glue line 52 glue line 53 Leimspurabschnitt 54 interruption 55 Leimspurabschnitt 56 interruption 57 nozzle plate 58 59 60 61 glue line 62 glue line 63 Leimspurabschnitt 64 interruption 65 Leimspurabschnitt 66 67 nozzle plate 68 69 70 71 72 73 74 cross perforation 75 cross perforation 76 cross perforation 77 line R transport direction

Claims (8)

1. A device for generating hoses (22) or hose sections (20), from which bags, preferably paper bags, can be produced, wherein the hoses (22) or the hose sections (20) comprise at least a material layer (4, 5, 6, 15), preferably at least a paper layer, wherein the device comprises the following components:

   - an unwinding apparatus for unwinding at least one material web (4, 5, 6, 15) from a roll of web material (1, 2, 3)

   - an apparatus (16, 17, 30) for providing at least one edge area of each material web (1, 2, 3) with a glue

   - a hose forming apparatus (18), with which the edge area provided with glue can be folded over onto the second edge area and thus can be fastened,

   wherein in the device the hoses (22) or hose pieces (20) can be provided with air-permeable channels,
   characterized in that
   the apparatus (16, 17, 30) for providing at least one edge area of each material web (1, 2, 3) with glue comprises glue application valves (31), wherein at least two glue application valves (31) are assigned to each material web (1, 2, 3), with which interrupted traces of glue (41, 42, 51, 52, 61, 62) can be generated, wherein the interruptions (44, 54, 64) form air-permeable channels.
2. A device according to Claim 1,
   characterized in that
   at least one nozzle plate (33) is provided, to which the at least two glue application valves (31) assigned to a material web, are assigned.
3. A device according to the preceding claim,
   characterized in that
   the at least one nozzle plate (33) is displaceable relative to the machine frame.
4. A device according to one of the two preceding claims,
   characterized in that
   at least two nozzle plates (33) are provided, which are displaceable relative to each other.
5. A device according to any one of the preceding claims
   characterized in that
   at least two of the following positions are provided, between which the glue valves (31) and/or the nozzle plate (33) can be pivoted:

   - glue application position,

   - flushing- and maintenance position,

   - service position.
6. A device according to any one of the preceding claims,
   characterized in that
   a computing- and control device is provided, which controls the opening- and closing processes of the glue application valves (31).
7. A device according to the preceding claim,
   characterized in that
   with the computing- and control device the opening- and closing times of the glue application valves (31) can be calculated from a predetermined appearance of the air-permeable channels.
8. A method for generating hoses (22) or hose sections (20), from which bags, preferably paper bags, can be produced, wherein the hoses (22) or the hose sections (20) comprise at least a material layer (4, 5, 6, 15), preferably at least a paper layer, wherein the method comprises the following steps:

   - unwinding at least one material web (4, 5, 6, 15) from a roll of web material (1, 2, 3) in an unwinding apparatus,

   - providing at least one edge area of each material web (4, 5, 6, 15) with a glue,

   - folding over and fastening the edge area provided with glue onto the second edge area in a hose forming apparatus (18),

   wherein the hoses (22) or hose pieces (20) are provided with air-permeable channels,
   characterized in that
   on each material web (4, 5, 6, 15) with at least two glue application valves (31) at least two interrupted traces of glue (41, 42, 51, 52, 61, 62) are generated, wherein the interruptions (44, 54, 64) form air-permeable channels.

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