WO2008128655A1

WO2008128655A1 - Method and apparatus for applying glue to workpiece components to produce sacks and bags

Info

Publication number: WO2008128655A1
Application number: PCT/EP2008/002834
Authority: WO
Inventors: Guido Kerres
Original assignee: Windmöller & Hölscher Kg
Priority date: 2007-04-20
Filing date: 2008-04-07
Publication date: 2008-10-30
Also published as: EP2136932A1; EP2136932B1; ATE513622T1; DE102007018730A1; ES2365374T3; DE102007018730B4

Abstract

The invention relates to a method for applying glue (9) to components of workpieces (3) to produce sacks or bags, preferably made of paper. In said method, glue is applied to the components of the workpieces (3) by means of a format roller or plate roller (5), the glue is transferred from a glue application roller (8) to the format roller or plate roller (5), said glue application roller (8) removing the glue from a glue feeding device (10, 12, 19). The layer thickness of the glue is influenced by a metering roller (11) that is associated with the glue application roller (8), the circumferential speeds of said rollers (5, 8, 11) being independently adjustable. The ratio between the circumferential speeds of the glue application roller (8) and the metering roller (11) and/or the ratio between the circumferential speeds of the glue application roller (8) and the format roller or plate roller (5) is adjusted in accordance with properties of the glue that is applied to the workpieces (3).

Description

Method and device for applying glue to components of workpieces for the production of sacks and bags

The invention relates to a method for applying glue to components of workpieces for the production of sacks or bags according to the preamble of claim 1 and to an apparatus for carrying out said method.

The patent application DE 102 55 484 describes a gluing unit for a bottom-laying device for cross-bottom sacks, which comprises various rollers. These include: a size or cliché roller for applying glue to components of the workpieces, a glue application roller for removing glue from or from a glue supply device and for applying the glue to the size and plate roller and a metering roller associated with the glue application roller. The peripheral speeds of these three mentioned rollers are independently adjustable. For this purpose, each of these rollers is assigned its own drive motor.

However, such gluing plants are not only used in devices for producing cross-bottom sacks. An example of another machine in which such a gluing unit can be used is a tube machine in which hoses are produced, which ultimately serve for the production of sacks or bags. Such tube machines can be operated independently of other machines for producing sacks or bags or be integral components of the latter machines. Such a hose machine is for example from the Patent EP 0 664 208 B1. However, the present invention is not limited to the machines described above.

To that of the glue applicator on. To be able to influence the format or cliché roll transferred amount of glue, the glue roller is the

Assigned metering, wherein the glue applicator roll and the metering roller can rotate in opposite directions or in the same direction. The circumferential speed with which the metering roller rotates in comparison to the glue application roller, thereby influences the amount of glue that adheres to the glue application roller after passing through the metering roller and which emits the glue application roller to the cliché roller.

In practice, however, such a gluing plant is operated by the ratio of the peripheral speeds of the rollers involved is always fixed. The peripheral speed of the format or plate roller usually corresponds to the transport speed of the workpieces to be glued so as not to apply the glue beyond their edges, which would mean inter alia soiling of the production device. By contrast, the peripheral speed of the glue application roller generally has a different peripheral speed than the format roller. To adjust the amount of glue finally applied to the workpieces, the distance between the metering and glue application rollers is now set. An increase in the nip produced by these two rolls usually means that a greater amount of glue is applied to a work piece. The adjustment of the distance is usually based on experience of the operating personnel.

It has been found, however, that at various production speeds, the amount of glue applied to the workpieces is subject to too high, too low or large variations. This has a direct effect on the quality of the bags or bags produced, in which the bonds are sometimes not durable or the outer surfaces are smeared with adhesive. Thus, it has been observed in practice that, for example, at a processing speed of 30 less glue is applied to each workpiece to be glued per unit time than if glue is applied to 250 workpieces per unit of time.

The object of the present invention is therefore to propose a method and a device in which the same, desired amount of glue is always applied to the workpieces to be glued.

The object is achieved by a method comprising the features of the characterizing portion of claim 1 and by an apparatus comprising the characterizing features of claim 6.

Accordingly, the ratio of the peripheral speeds of the glue applicator roller and the metering roller and / or the ratio of peripheral speeds of the glue applicator roller and the size or plate roller are adjusted depending on properties of the glue applied to the workpieces. The invention is based on the idea that the properties of the glue affect its transfer behavior and thus the amount of glue applied to the workpieces. Thus, if the properties of the glue are taken into account from the beginning of the production of the sacks or bags to adjust the ratio of the peripheral speeds of the rollers involved, the bags can always be subjected to an almost optimum amount of glue. Thus, ratios of peripheral speeds of the rollers can be found for each size, in which the amount of glue also at different absolute peripheral speeds of the plate roller, so ultimately at different

Production speeds, is almost constant. This situation could be determined during experiments.

In an advantageous development of the invention, the various glues which can be used in the gluing unit are assigned ratios of the circumferential speeds of the rollers involved. These values, which are then as optimal as possible, could be suitably determined, for example by corresponding tests, determined. These tests can be carried out, for example, by the manufacturer of gluing plants and the resulting values made available to the users of the gluing plants. The glues that can be used in a gluing unit differ in their properties, which affect the amount of glue that is transferred to the workpieces. The individual glues are characterized by their properties such as the viscosity of the glue, by the adhesive properties of the glue on the rollers, by the moisture and / or solids content, ie generally by the approach ratio, or by the raw materials used. These aforementioned. Characteristics can define a "glue type", whereby the above list does not claim to be exhaustive, but other properties such as the age and production batch of the glue and its manufacturer can also play a role in connection with the present invention It is assumed that the same rolls are always used, and if other rolls are used as well, the values for the ratios of the peripheral speeds in. are also applicable for the different gluing properties Depending on the rollers or their properties to determine.

In a particularly advantageous embodiment of the invention, these values for different glues or their properties are stored in a memory device. Information about the glue used in the gluing unit in the next application is made available to a computing and control device. This can be done, for example, by the operating personnel selecting one of a number of designations for the different glues with an input device provided by the arithmetic and control device. A possible glue can be defined by its properties, which are described for example by a sales description and a batch number. Another possibility is that the operating personnel have an indication of the properties of the glue to be used via an input device of the calculation unit. and control device notifies. Based on this input or input, the computing and control device can now retrieve the associated values from the memory device and set the corresponding ratios of the peripheral speeds.

It should be noted at this point that up to now there has always been talk of the ratios of the circumferential speeds of the rolls involved in glue transport. These ratios usually remain constant, with the absolute peripheral speeds naturally changing with machine speed. However, the computing and control device controls the individual drives, so that the rollers have the required absolute peripheral speeds. For this purpose, the control device calculates the absolute speeds from the machine speed and the values relating to the ratios of the peripheral speeds and controls the drives and / or transmissions accordingly.

It is also possible to change the ratios of the circumferential speeds during operation in order to be able to react to changes in the properties of the glue during operation. This is interesting, for example, when the viscosity of the glue changes due to temperature influences. Such influences can be taken into account by the computing and control unit, that a certain evaporation of the moisture of the glue, for example, the water is assumed. The corresponding evaporation rates can be stored in the memory unit.

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

Fig. 1 Top view of a glue application station for carrying out the method according to the invention. Fig. 2 side view of a glue application station for carrying out the method according to the invention Fig. 3 view of another embodiment of a gluing unit for performing the method according to the invention

Fig. 1 shows schematically a glue application station 1, as it is typically used machines for the production of bags with cross bottoms. These machines are referred to in professional circles as Bodenlegevorrichtungen. Such bags may have one or two such trays, which may be provided with valves and / or reinforced with bottom cover sheets. The later soils are molded in the floor laying device to pieces of hose. Both the pieces of tubing or the bags as well as valves and bottom cover sheets are referred to as workpieces within the scope of the invention. Such workpieces may be provided with glue in a glue application station shown, and then later joined to themselves (in the case of the individual bottom forming flaps or tabs on the length of tubing) or to other workpieces.

But also in hoses-producing machines, the so-called hose machines, glue application stations 1 can be provided. In such a tube machine, a flat material web or a plurality of superimposed material webs, the longitudinal edges, however, preferably not superimposed, but are laterally offset, are folded with their side edges to a longitudinal direction, so that overlap the two edge regions of each material web position. These overlapping areas can be provided with glue by means of a glue application station 1, resulting in a permanent connection along the overlapping area. This resulting tube can later be separated into so-called tear-offs to pieces of tubing, which are then processed directly after or later to an intermediate storage to sacks or bags. The material webs for forming a hose are covered by the term "workpieces" used in this patent application. Workpieces 3 are guided through the glue application station 1 by means of a transport device 2 shown schematically. In this glue application station 1, the counterpressure roller 4 and the plate roller 5 form a roller nip 6, in which the two rollers in question are usually placed against one another such that the plate 7 bears against the counterpressure roller 4 or the workpiece 3 with overpressure. When passing through the nip 6, the workpiece 3 is coated on its side facing the cliché roller 5 with glue. For this purpose, the cliché roller 5 carries so-called clichés 7, which are congruent with the surface of the workpiece 3 to be treated with glue. Only the cliché carries the glue, so that provided a suitable phase and height position of the workpiece 3 and the plate 7, only the intended surface is provided with glue.

The cliché roller 5 is supplied by the glue application roller 8 with glue 9, which is stored in the glue container 10. The glue application roller 8 is associated with a metering roller 11, with which the removal of the glue 9 from the glue container 10 can be adjusted. The metering roller 11 is approximated to the glue application roller 8, but does not touch it during operation, so that both rollers form a nip 20, through which the glue 9 can be removed from the glue container. The directions of rotation of the individual rollers 5, 8 and 11 are symbolized by the arrows D5, D8 and D11. The direction of rotation D4 of the roller 4 is also shown. In the embodiment shown, the rollers 11 and 8 rotate in the same direction. In the area of the nip formed by these rollers, the peripheral surfaces thus run exactly opposite. The amount of adhesive removed with the glue application roller 8 from the glue container 10 can be changed by changing the nip 20. For this purpose, the metering roller 11 can be displaced substantially along the direction of movement A symbolized by a double arrow.

Depending on the nature of the workpiece used can be provided in the glue container 10 different glues, which are adapted inter alia to these textures available. This is what the peripheral speeds of the rollers involved in glue transport are now adapt to keep the amount of glue applied to the workpieces 3 constant even when changing the absolute rotational speeds of the rollers involved in glue transport. This is advantageously done by a suitable adjustment of the peripheral speed of the metering roller 11 in a fixed ratio to the peripheral speed of the glue application roller 8, depending on the glue used. This setting preferably takes place before the start of production, but can also be carried out during ongoing production.

FIG. 2 shows the view II-II in FIG. 1. The view I-I in FIG. 2 again points to the view represented in FIG. In FIG. 2, in addition to the elements shown in FIG. 1, the support plate 13 on which the glue application roller 8 and the metering roller 11 are mounted in a floating and rotatable manner and the drive motors 14 and 15 for the glue application roller 8 and the metering roller 11 are shown. In addition, a glue supply line 12 is shown, via which the glue container 10 further glue from a glue tank can be fed.

The two drive motors 14 and 15 are set by the computing and control unit 16 in their speed, so that the desired peripheral speed is adjustable for the rollers. In order to be able to set the desired peripheral velocities, which may depend on the size of the glue, as described, a plurality of sales marks of the glues as well as further associated information can be displayed on the display or output device 17, for example as a monitor. These information relating to the glue and the associated ratios of the peripheral speeds are stored in a storage device, not shown, to which the computing and control device 16 has access and which can be integrated in the computing and control device. Via the input device 18, the machine operator can now select and determine the glue to be introduced into the glue container 10 for the new application. From the determination of the glue the computing and control device calls now from the memory the assigned value for the ratio of Peripheral speeds of the glue application roller 8 and the metering roller 11 from.

FIG. 3 shows a further embodiment of a device according to the invention, in which the glue container 10 has been replaced by a glue nozzle 19. This glue nozzle 19, as well as the glue container 10, on the support plate 13 can be fastened. The choice of Leimzuführeinrichtung, so the selection of glue container 10 and glue nozzle 19, also has an influence on the set peripheral speeds of the rollers involved in glue transport. Therefore, the calculating and control device 16, which is not shown again in this Figure 3, when using a glue nozzle 19 compared to the use of a glue container another ratio of the peripheral speeds of the glue applicator roll 8 and the metering roller 11 set at the same glue. The information or ratios of the peripheral velocities assigned to the individual glues can therefore also be subdivided with respect to the glue supply device.

Claims

claims

1. A method for applying glue (9) to components of workpieces (3) for the production of sacks or bags, preferably of paper, in which

by applying a size or cliché roller (5) glue to the components of the workpieces (3),

- The glue is transferred from a glue applicator roll (8) on the size or plate roller (5), wherein the glue application roller (8) decreases the glue from a Leimzuführeinrichtung (10, 12, 19).

the layer thickness of the glue is influenced by a metering roller (11) assigned to the glue application roller (8),

- Wherein the peripheral speeds of said rollers (5, 8, 11) can be adjusted independently of each other, characterized in that the ratio of the peripheral speeds of the glue application roller (8) and the metering roller (11) and / or the ratio of the peripheral velocities of the glue application roller (8 ) and the size or cliché roller (5) depending on properties of the applied to the workpieces (3) glue is adjusted.

2. The method according to claim 1, characterized in that values for the ratio of the circumferential speeds are respectively assigned to different gluing properties, wherein the ratios of the peripheral speeds are set on the basis of the glue used according to these values.

3. Method according to the preceding claim, characterized in that

that values for the ratio of the peripheral speeds for different glue properties are stored in a storage device,

- that the values of a computing and control device (16), which is informed about the glue properties, made accessible, and

- That the ratio of the peripheral speeds of the computing and control device (16) is set according to the values.

4. The method according to any one of the preceding claims, characterized in that the amount of glue applied to the workpiece is determined in order to draw conclusions about the properties of the glue.

5. Device (1) for carrying out the method according to one of the preceding claims, comprising:

a size or cliché roller (5) for applying glue to components of the workpieces (3),

a glue application roller (8) for removing glue from or from a glue supply device (10, 12, 19) and for applying the glue to the size and plate roller (5),

- one of the glue application roller (8) associated metering roller (11), with which the layer thickness of the glue on the glue application roller (8) is adjustable,

- wherein the peripheral speeds of said rollers (5, 8, 11) are independently adjustable, characterized in that a computing and control device (16) is provided, with which the Ratio of the peripheral speeds of the glue applicator roll (8) and the metering roller (11) and / or the ratio of the peripheral speeds of the glue applicator roll (8) and the format or plate roller (5) depending on the properties of the applied to the workpieces (3) glue adjustable is.

6. Device (1) according to the preceding claim, characterized in that a storage device is provided, in which for different gluing properties values for the ratios of the peripheral speeds of said rollers (5, 8, 11) are stored.