EP2498984A1

EP2498984A1 - Bottom-cover-sheet subassembly for periphery-free gluing

Info

Publication number: EP2498984A1
Application number: EP10773315A
Authority: EP
Inventors: Jörg Christian THIES; Thomas Bozic; Thorsten KRÖGER
Original assignee: Windmoeller and Hoelscher KG
Current assignee: Windmoeller and Hoelscher KG
Priority date: 2009-11-09
Filing date: 2010-11-02
Publication date: 2012-09-19
Anticipated expiration: 2030-11-02
Also published as: DE102009046537B4; EP2498984B1; WO2011054824A1; ES2443227T3; DE102009046537A1

Abstract

The invention describes an apparatus for adhesively bonding pieces of material (1) onto parts of bags (2) or sacks, comprising: a supply device, by means of which joined-together pieces of material can be supplied, a separating device, by means of which individual pieces of material can be supplied, a first transporting cylinder, by means of which separated pieces of material can be transported further, and an adhesive-applying device (19), by means of which adhesive can be applied onto a respective piece of material, characterized in that a second transporting cylinder (6) is provided, it being possible for this second transporting cylinder to receive the pieces of material from the first transporting cylinder and to apply the pieces of material to the parts of the bags (2) or sacks, and in that the adhesive-applying device (19) interacts with the second transporting cylinder (6), and therefore adhesive can be applied to the piece of material when the latter is located on the second transporting cylinder (6).

Description

Ground cover sheet aggregate for borderless gluing

The invention relates to a device for adhering pieces of material to parts of bags or sacks according to the preamble of claim 1 and to a corresponding method according to the preamble of claim 12.

Such devices and methods have been used in the manufacture of bags or sacks for many years. Bags, particularly block bottom bags with gussets, are often made in a longitudinal process in which a piece of tubing is conveyed to the bag in its longitudinal direction for processing. At the leading end of the hose piece is a bottom, often a block or block bottom, formed. The Auslegeschrift DE 1 245 699 shows a complete device for the production of bags of sheet-like materials. Often such bags are provided with bottom cover sheets to increase the stability of the soil. At the same time, the bottom cover sheets can be designed so that the user of this bag is a carrying handle available. Such bags with differently designed cover sheets are shown and described in DE 41 02 548. DE 1 245 699 indicates a device for adhering pieces of material to parts of bags or sacks. The device is called there cover sheet sticker. However, it is not described in detail in the cited document. Such device for adhering pieces of material initially comprises a provision device for providing pieces of material. This can be one Be magazine with which individual pieces of material, ie, for example, cover sheets, are provided as a stack. Often, however, one finds web rolls, of which individual pieces of material are to be separated. This takes place in a separating device in which individual pieces of material can be separated from the roll. Such separating devices usually comprise a smooth-cutting or perforating knife with which separating cuts can be introduced into the material web. For individual, stacked pieces of material, the singulator is designed so that it can remove a piece of material from the stack. The separated piece of material is taken over by a first transport cylinder which guides the piece of material past an adhesive application device. The piece of material provided with adhesive is then stickable to parts of bags or sacks, in practice usually the floors.

The adhesive application device comprises an adhesive reservoir and an adhesive removal roller, which draws adhesive from the adhesive reservoir. Said roll then delivers the adhesive to an adhesive applicator roll. This roller carries a to be glued surface of the piece of material corresponding format piece, which is often referred to as a cliché. Only this format piece takes the adhesive from the adhesive removal roller and transfers it to the piece of material.

Since often intended for the separation cutting blade is integrated in the transport cylinder, there is the problem of contamination by the adhesive.

The object of the present invention is to propose an apparatus and a method for adhering pieces of material to parts of bags or sacks, which avoids the said and other disadvantages.

According to the invention, this object is achieved by the addition of the features of the characterizing part of claims 1 and 12. Accordingly, a second transport cylinder is provided, with which the pieces of material from the first transport cylinder can be taken over and with which the pieces of material can be applied to the parts of the bag or sacks. Furthermore, it is provided that the adhesive application device cooperates with the second transport cylinder, so that adhesive can be applied to the material piece, if this is located on the second transport cylinder.

For the provision of adhesive and the application of the material piece to the bags or sacks so a second transport roller is provided, which takes over the piece of material from the first transport roller. Only then is the piece of material provided with adhesive. In this way, an unforeseen adhesive transfer to the first transport roller and thus to the cutting blade or other means for separating is avoided.

In a particularly preferred embodiment of the invention, it is provided that the second format cylinder comprises a format part whose surface contour corresponds to the region of a material piece to be provided with adhesive and that the material piece rests on this format part during transport with the second transport cylinder.

This provides various benefits. It has been found that full-surface gluing of the piece of material with adhesive is in fact not possible with prior art devices. Corresponds to the cliché exactly the contour of the piece of material to be glued so passes because of the necessary contact pressure adhesive beyond the edges of the piece of material out, which leads to the above pollution problems. A very well fitting reduction of the cliché to avoid this problem is not or only very cumbersome.

In the aforementioned embodiment, this problem is now circumvented by the material piece is now arranged raised above the outer surface by the format part on the outer surface of the second transport cylinder. If now the adhesive is applied by means of a roller, So this can only stick to the piece of material and does not reach the second transport cylinder. Thus, on the one hand pollution of the transport cylinder is avoided and on the other hand a more complete - a so-called borderless - adhesive application achieved. Especially the latter point is important if the bag is to be filled automatically in a filling device. In bags made in conventional devices, the bottom deck often has an edge that is not glued to the bag or bag. This edge can unfold in a filling device and then disturbs the proper transport of the bag through such a device. Machine downtime can not be ruled out in such cases. The device according to the invention can now be used to produce bags or sacks which can be transported more reliably in filling devices.

In a further advantageous embodiment of the invention, it is provided that the format part comprises recesses or depressions. This embodiment is advantageous if the cover sheet is to comprise one or more carrying handles. Such carrying handles can be created by cutting the piece of material so that the subsequent user can reach under the area delimited by the cuts. Of course, these areas must not be coated with adhesive. With the recess or depressions in the format part, the region of the later carrying handles can now be pulled slightly inwards as seen in the radial direction of the second transport roller, so that this area is not provided with adhesive.

The piece of material can be held in different ways on the surface of the second transport cylinder. A practicable solution would be holding tongs or other mechanically acting devices. Magnetic or electrostatic forces would also be possible, depending on the material. However, it is preferred that the second transport cylinder comprises openings, which can be acted upon by negative pressure. This vacuum is sufficient to hold pieces of material of very different materials on the cylinder can. Furthermore, it can be provided that the openings not only with negative pressure, but also with overpressure can be acted upon. The piece of material can thus be sucked in with negative pressure or repelled with overpressure. The latter is advantageous at the moment when the piece of material is to be dispensed from the second transport cylinder and applied to the bag.

It is advantageous if at least a part of the openings continues through the format part, so that a piece of material can also be reliably retained on the format part. The adhesive application roller needs, if the second transport roller carries a format part, itself no longer be subjected to a cliché. It is now sufficient to use an adhesive applicator roll, which has the same surface structure over the entire outer circumference. So it can be especially smooth. It is also advantageous if the adhesive application roller at least partially comprises a metal surface.

In a preferred embodiment, an adhesive application device is provided, with which hot-melt adhesive, ie hot-melt adhesive, can be provided. In addition to the procedural advantages (no drying of the adhesive to fear during breaks, no long drying time for glued together workpiece parts necessary) is to be mentioned as an advantage that now not only paper materials can be glued. Now plastic bags can be made in the same way. Also bags that include both paper and plastics are producible. In general, bags made of any materials can be produced with it.

In an advantageous embodiment of the invention, the adhesive application device by means of a Absteileinrichtung from an operating position in which adhesive can be applied to a piece of material, off, so that no contact with the piece of material, or if this is missing, can be produced with the format part. In this way, the unforeseen contamination of the transport cylinder can be avoided. The Absteileinrichtung may include at least one compressed air cylinder. Advantageously, two such cylinders. A first short stroke cylinder can be for a very fast Ensure that the adhesive applicator is stopped when a piece of material fails. The parking distance only needs to be a few millimeters. A Weithubzylinder can convey the adhesive applicator in a maintenance position, which may for example be several 10 cm above the operating position. Pneumatic cylinders are an example of suitable lifting devices. Other devices are equally applicable.

Particularly advantageous is a sensor with which the presence or absence of a material section can be detected. The sensor may provide its "observations" to a controller which, in the absence of a portion of material, actuates the divider.

In a further embodiment of the invention, it is provided that the adhesive application device comprises an adjustment device, with which the minimum radial position is adjustable relative to the second transport cylinder. By an optimal adjustment of the adhesive applicator roller relative to the second transport cylinder of the adhesive transfer can be optimized so that no adhesive reaches the format part or the second transport roller. In addition, it can be used to set the amount of adhesive to be transferred to the piece of material.

Further embodiments of the invention will become apparent from the description and the claims.

The individual figures show:

Fig. 1 side view of a device according to the invention for adhering pieces of material

Fig. 2 view of the section II-II in Fig. 1st

Fig. 3 view of the section III - III in Fig. 2nd

Fig. 4 view of the section IV - IV in Fig. 2nd

Fig. 1 shows a device 1 for adhering material pieces not shown in detail on parts of bags 2. The bags are transported by means of a so-called storage cylinder 3, which has the task to a To put down finished bag 2 on a bag stack, not shown. The bag 2 is initially transported by the storage cylinder along a first pressure roller 4. This has the task, the bag bottom 5, which has just been formed in the previous steps, to press again to get the gluing of the piece of material (here: a ground cover sheet) as flat as possible. Immediately thereafter, the bottom cover sheet provided by the second transport cylinder 6 and already provided with adhesive is accurately applied to this floor. For this reason, the second transport cylinder can also be referred to as transfer cylinder 6. The operations required to provide the ground cover sheet are described below. After application of the bottom cover sheet, the bag 2 is guided past a second pressure roller 7, which again presses the ground, so that the bottom cover sheet is as firmly as possible connected to the ground.

The bottom cover sheets are provided in the form of a roll 8, from which the material web 9 is unwound. The web 9 passes through the nip of a punch 10. A first roller 1 1 carries one or more punching blades, a second roller 12 comprises a counter-layer. With this punch cuts can be introduced into the web 9, which later separate the carrying handles from the rest of the bottom cover sheet.

The web 9 now passes through the nip of a feed roller pair 13. Subsequently, the web 9 reaches the peripheral surface of a cutting cylinder 14, which carries a cutting knife 15, usually in the form of a slitter knife. The knife 15 cooperates with the fixed counter blade 16 and separates individual pieces of material, the later ground cover sheets, from the material web 9. The cutting cylinder transports the so-isolated ground cover sheets on and therefore can also be referred to as the first transport cylinder 14. In order to hold the bottom cover sheet on the outer circumference of the cutting cylinder 14, this is preferably designed as a suction cylinder. This means that this cylinder comprises on its peripheral surface openings which can be acted upon by negative pressure. The structure of the cutting cylinder 14 will be explained later with reference to the transfer cylinder 6, the advantageously has the same functionality with respect to the retention of the bottom cover sheet.

For this purpose, the openings, which were previously subjected to negative pressure, now subjected to an overpressure, so that the corresponding area of the bottom cover sheet is pressed away from the cutting cylinder 14 in the direction of the transfer cylinder 6. The transfer cylinder is acted upon at the same time with a negative pressure, so that a secure transfer of the ground cover sheet comes about.

The transfer cylinder 6 carries on its outer surface at least one format part 17. This is interchangeable and corresponds to the extent of the bottom cover sheet. After having been taken over by the cutting cylinder, the bottom cover sheet occupies exactly the format part 17. The format part 17 has through holes which correspond to the openings of the transfer cylinder 6 that can be subjected to negative pressure, so that a bottom cover sheet can be securely fixed to the format part 17 by the negative pressure. In the further course, the bottom cover sheet is pressed by a pressure roller 18 against the format part 17, wherein not only the bottom cover sheet is again fixed on the format part 17 and smoothly painted, but the later grip strip is pressed slightly into an introduced into the format part recess. On the recess of the format part and the lowering of the grip strip will be discussed later in more detail. Now only areas of the bottom cover sheet, which do not belong to the later grip strip, are in an exposed position, so that only these areas are provided with adhesive. For this purpose, an adhesive application device 19 is provided, which comprises at least one glue reservoir 20 and an adhesive application roller 21. The adhesive applicator roll 21 can directly remove the adhesive from the reservoir. But it can also - as known - be provided an adhesive transfer roller, which takes over the task of adhesive removal and applies the adhesive to the adhesive applicator roll. The adhesive application roller 21 is positioned relative to the transfer cylinder so that they just rest on the raised areas of the format part 17 Touched parts of the bottom cover sheet and only provides these parts with adhesive. Thus, neither the peripheral surface of the transfer cylinder 6 nor the lower regions of the bottom cover sheet, ie in particular the later grip strip, are covered with adhesive. In contrast, since the adhesive applicator roller 21 rolls on the exposed portions of the bottom cover sheet, the bottom cover sheet is covered with adhesive without leaving an uncovered portion. For adjusting the position of the adhesive applicator roll 21, it can advantageously be provided slidably in the direction of the double arrow 22, advantageously together with the adhesive reservoir.

During the transfer of the bottom cover sheet, the negative pressure acting on the openings is switched off and an overpressure is switched on, so that the adherence of the bottom cover sheet to the bag 2 is still supported. It may happen that a ground cover sheet is not transferred or at least not properly from the cutting cylinder 14 to the over-cylinder 6. In order to prevent the adhesive application roller 21 from coming into contact with the format part 17, a sensor 23 is provided which detects the presence or absence of a bottom cover sheet. The corresponding signals can now be processed by a control device (not shown). This can now cause a displacement of the adhesive application roller 21 in the direction of the double arrow 22. The displacement takes place by means of a parting device, which will be explained with reference to FIG 2. In the figure 2, which shows the view II - II of Figure 1, various other details of the device 1 are shown. In this figure it can be seen that the adhesive reservoir 21 is displaceable along a rail 24 in the direction of the double arrow 22. It can also be provided a plurality of parallel rails. Preferably, two rails 21 are disposed at each end of the adhesive reservoir 21. The rails 24 are supported on brackets 25, which may be connected in a manner not shown to the machine frame. In addition, a stop 26 is supported on a bracket 25. This is adjustable so that the operating position in which the adhesive application roller 21 applies the adhesive to the ground cover sheet, is changeable. As an example of a stop 26, a pin 50 is shown, which is a portion 51 with a hexagonal plan, to which a wrench can engage, and a threaded portion 52 which is screwed into the bracket 25, is provided. By rotating the pin so its height and thus the operating position can be varied.

On the console 25 continues to support a first piston-cylinder unit 26, which is designed as a quick-release cylinder unit. This is actuated by the control device when the absence of a bottom cover sheet has been detected by means of the sensor 23. In addition, a second piston-cylinder unit 27 is arranged on the console 25, which is designed as a Weithubzylindereinheit. With this cylinder unit 27, the displacement of the adhesive applicator 19 in a maintenance position is possible.

In the figure 2, the outer surface 31 of the transfer cylinder 6 is shown. It can be seen that this comprises a plurality of openings 30. In order to be able to apply this to overpressure or negative pressure, a disk 32 is arranged at least on one end side of the transfer cylinder 6 and does not rotate together with the transfer cylinder. This disc 32 comprises an overpressure port 33 and a vacuum port 34. In this context, overpressure and negative pressure mean that a fluid is provided which is exposed to a higher or a lower pressure relative to the ambient pressure. Preferred fluid is air, so that can be spoken of overpressure of compressed air and negative pressure of a vacuum.

In Figure 3, the essential details are shown, which are required to apply the openings 30 with positive or negative pressure. The transfer cylinder 6 has a comparatively thick jacket, which comprises a plurality of axial bores 35, which in turn may be configured as through-bores. Each of these axial bores 35 may communicate with a plurality of radial bores 30 that represent the openings 30. If individual openings 30 are not supposed to overlap with or negative pressure can be applied, 35 bolts 37 can be inserted in the corresponding axial bores, whose length is dimensioned so that the desired number of openings 30 is covered. In FIG. 3, the open bores 35 are white and the bores closed with bolts 37 are shown in black.

In the figure 4, the disk 32 is shown in more detail. This comprises a circular arc-shaped recess 38 which communicates with the vacuum port. The radial position of the recess 38 is dimensioned so that it can communicate with the holes 35. The recess 38 includes, for example, an angle in a range of 200 to 270 degrees. A bore 35, which is located in this angular range, is subjected to negative pressure. Upon further rotation of the transfer cylinder 6, the bore 35 leaves after a certain time the recess 38. Shortly thereafter, the bore 35 reaches a second circular arc-shaped recess 39. This is supplied via the compressed air connection 33 with an overpressure, so that the overpressure now the bore 35th detected. In the manner described so switching the openings of negative pressure to overpressure, if the ground cover sheet is no longer held, but rather repelled and handed over. The procedure described does not only refer to the transfer cylinder. It can also be provided in the cutting cylinder 14.

LIST OF REFERENCE NUMBERS

Device for sticking pieces of material

bag

storage cylinder

First pressure roller

bag bottom

Second transport cylinder / transfer cylinder

Second pressure roller

reel

web

punch

First roll

Second roller

Preferred roller pair

cutting cylinder

separating knife

against knife

format part

pressure roller

Adhesive application device

adhesive reservoir

Adhesive applicator roll

Displacement direction of the adhesive application roller 21

sensor

rail

console

First piston-cylinder unit

Second piston-cylinder unit Openings

Outer surface of the transfer cylinder 6

disc

Compressed air connection

vacuum connection

Axial bore

Rotary axis of the transfer cylinder 6

bolt

Circular arc-shaped depression

Second circular arc-shaped depression

pen

Section with hexagonal floor plan

Threaded section

Claims

claims

1 . A device for adhering pieces of material (1) to parts of bags (2) or bags, comprising:

a provision device with which contiguous pieces of material can be provided,

a separating device, with which individual pieces of material can be provided,

a first transport cylinder, with which isolated pieces of material can be transported further,

an adhesive application device (19), with which adhesive can be applied to a respective piece of material,

characterized,

a second transport cylinder (6) is provided, with which the material pieces can be taken over by the first transport cylinder, and with which the material pieces can be applied to the parts of the bags (2) or sacks, and in that the adhesive application device (19) is connected to the second transport cylinder (19). 6) cooperates, so that adhesive can be applied to the piece of material, if this is on the second transport cylinder (6).

2. Apparatus according to claim 1,

characterized,

in that the second transport cylinder (6) comprises at least one format part (17) whose surface contour corresponds to the region of an adhesive area Material piece corresponds, and

that the piece of material during transport with the second transport cylinder (6) rests on this format part.

3. Device according to the preceding claim,

characterized in that

the format part recesses or recesses (38, 39).

4. Device according to one of the preceding claims,

characterized in that

the second transport cylinder (6) in its peripheral wall openings (30) which can be acted upon by negative pressure, so that the piece of material on the transport cylinder is durable.

5. Device according to one of the three preceding claims,

characterized in that

at least a part of the openings (30) continues through the format part.

6. Device according to one of the preceding claims,

characterized in that

with the adhesive application device (19) hot melt adhesive (hot melt adhesive) can be provided.

7. Device according to one of the preceding claims,

characterized in that

the adhesive application device (19) comprises an adhesive applicator roll (21) with which the adhesive can be applied to a piece of material, wherein the adhesive applicator roll (21) at least partially comprises a metal surface.

8. Device according to one of the two preceding claims,

characterized in that

the adhesive applicator (19) with a Absteileinrichtung from an operating position of the second transport roller (6) can be turned off.

9. Device according to the preceding claim,

characterized in that

the Absteileinrichtung comprises at least one compressed air cylinder.

10. Device according to one of the preceding claims,

characterized in that

a sensor (23) is provided, with which the presence or absence of a material section can be determined, so that in the case of the absence of a material section, the Absteileinrichtung is actuated.

1 1. Device according to one of the preceding claims,

characterized in that

the adhesive application device (19) comprises an adjustment device with which the minimum radial position relative to the second transport cylinder (6) is adjustable.

12. A method for adhering pieces of material on parts of bags (2) or bags, in which

contiguous pieces of material are provided with a provision device

individual pieces of material are provided by a separating device,

the separated pieces of material are transported on with a first transport cylinder,

adhesive is applied to one piece of material with an adhesive application device (19),

characterized

that the pieces of material from a second transport cylinder (6) taken over and applied to the parts of the bag (2) or bags, and

that the adhesive application device (19) adhesive is applied to the piece of material when it is on the second transport cylinder (6).