Process and packaging material manufacturing machine for bonding layers of a fiber-based paper or cardboard packaging material

Abstract

The present invention relates to a method (200) for joining layers (101a, 101b), in particular two layers (101a, 101b), of a fiber-based paper or cardboard packaging material (101) by a packaging material manufacturing machine (100), wherein the packaging material manufacturing machine (100) comprises a conveying module (103) for conveying at least one layer (101a, 101b) of the fiber-based paper or cardboard packaging material (101), an adhesive module (107) for applying aqueous, non-heat-activated adhesive (109) comprising ferromagnetic, superparamagnetic and / or piezoelectric particles (111), a displacement module (115) for displacing layers (101a, 101b) of the fiber-based paper or cardboard packaging material (101), and a magnetic module (117) for applying an alternating magnetic field. (119) wherein the fiber-based paper or cardboard packaging material (101) is designed to absorb water from the aqueous, non-heat-activated adhesive (109),characterized in that the method (200) comprises the following process steps: , Conveying (201) a first layer (101a) of the fiber-based paper or cardboard packaging material (101) through the conveying module (103); Application (203) of the aqueous, non-heat-activated adhesive (109) to at least one adhesive seam (113) of the first layer (101a) of the fiber-based paper or cardboard packaging material (101) by the adhesive module (107); Connecting (205) a second layer (101b) of the fiber-based paper or cardboard packaging material (101) to the at least one adhesive seam (113) of the first layer (101a) of the fiber-based paper or cardboard packaging material (101) by the displacement module (115); and Physical setting (207) of the aqueous adhesive layer between the first and second layers (101a, 101b) of the fiber-based paper or cardboard packaging material (101) by applying an alternating magnetic field (119) through at least one of the first and second layers (101a, 101b) in the area of ​​the at least one adhesive seam (113) through the magnetic module (117) in order to accelerate effective bonding between the first and second layers (101a, 101b) of the fiber-based paper or cardboard packaging material (101).

Description

[0001] The invention relates to a method and a packaging material manufacturing machine for joining layers, in particular two layers, of a fiber-based paper or cardboard packaging material using an aqueous, non-heat-activated adhesive.

[0002] Conventional, water-based, non-heat-activated adhesives, also known as cold glues, are predominantly based on fossil and thus finite resources. The desire for more sustainable production processes is giving new importance to bio-based adhesives made from renewable raw materials. Examples of such bio-based adhesives are adhesives that are predominantly based on starch, dextrin, lignin, or other natural, renewable raw materials, or mixtures of these adhesives. However, these bio-based adhesives have the disadvantage of having a longer setting time than synthetic adhesives.

[0003] One reason for this is, among other things, that the dispersed adhesive components in these bio-based adhesives have a higher water-binding capacity than is the case with cold glues based on synthetic raw materials. Cold glues generally set by the water used as a dispersant being absorbed as quickly as possible by the porous substrate or by evaporation. This removal of water from the adhesive leads to film formation and thus to the adhesive's tackiness.This process is slower with bio-based adhesives made from renewable raw materials than with synthetic adhesives, so that when bio-based adhesives are used, the efficiency of producing bonded packaging materials using a production machine is limited, as the conveying speed of the production machine often has to be reduced in order to ensure a sufficiently long pressing time between the layers of the packaging material for the complete formation of the adhesive bond.

[0004] Bio-based adhesives made from renewable raw materials are more environmentally friendly because they are not based on finite fossil resources. Due to fluctuating oil prices, oil-based products manufactured by the petrochemical industry also fluctuate, which in turn influences the costs of adhesive products. The targeted and projected increase in CO2 pricing will further increase the costs of fossil-based adhesives.

[0005] Given these challenges, there is a need to use adhesives based on natural and renewable materials. Such bio-based adhesives are not only environmentally friendly but also offer stability in the face of unpredictable price fluctuations that can occur with petroleum-based products. Furthermore, this step represents a significant development toward sustainable industrial production. However, bio-based adhesives based on renewable raw materials have a longer setting time compared to synthetic adhesives, which compromises the production of bonded packaging materials.

[0006] The document DE 10 2011 115 617 A1 discloses a transfer device with a magnetic field dryer.

[0007] DE 42 08 564 A1 describes a method and device for applying adhesive to cardboard surfaces. In this method, a bead of adhesive is applied in a curved line to one of the cardboard surfaces before the second sheet is applied.

[0008] It is an object of the invention to provide a method and a packaging material manufacturing machine for joining layers of a fiber-based paper or cardboard packaging material, in which the setting time of the aqueous, non-heat-activatable adhesive is advantageously reduced.

[0009] The object is achieved according to a first aspect by a method for joining layers, in particular two layers, of a fiber-based paper or cardboard packaging material by a packaging material manufacturing machine, wherein the packaging material manufacturing machine has a conveyor module for conveying at least one layer of the fiber-based paper or cardboard packaging material, an adhesive module for applying an aqueous, non-heat-activatable adhesive comprising ferromagnetic, ferrimagnetic, superparamagnetic and / or piezoelectric particles, a displacement module for displacing layers of the fiber-based paper or cardboard packaging material, and a magnet module for applying an alternating magnetic field, wherein the fiber-based paper or cardboard packaging material is designed to absorb water from the aqueous, non-heat-activatable adhesive, characterized in thatthat the method comprises the following method steps: conveying a first layer of the fiber-based paper or cardboard packaging material through the conveying module; applying the aqueous, non-heat-activatable adhesive to at least one adhesive seam of the first layer of the fiber-based paper or cardboard packaging material by the adhesive module; connecting a second layer of the fiber-based paper or cardboard packaging material to the at least one adhesive seam of the first layer of the fiber-based paper or cardboard packaging material by the displacement module; and physically setting the aqueous adhesive layer between the first and second layers of the fiber-based paper or cardboard packaging material by applying an alternating magnetic field through at least one of the first and second layers in the region of the at least one adhesive seam by the magnetic module,to accelerate effective bonding between the first and second layers of the fiber-based paper or cardboard packaging material.

[0010] This achieves the technical advantage that the setting time of the aqueous, non-heat-activated adhesive, or cold glue, can be advantageously reduced, whereby the process for setting aqueous cold glues for adhesives based on synthetic or bio-based, renewable or synthetic raw materials is accelerated and the tackiness of the adhesive layer between the layers of the fiber-based paper or cardboard packaging material is thus developed more quickly.

[0011] Due to the shorter setting time of the aqueous, non-heat-activated adhesive or cold glue of the present invention, the process can be carried out with a variety of adhesives based on synthetic or bio-based, renewable or synthetic raw materials without having to reduce the production speed of the packaging manufacturing machine, thus increasing the economic efficiency of packaging production.

[0012] The packaging material manufacturing machine according to the present invention comprises a conveyor module that preferably continuously conveys at least one layer of the fiber-based paper and cardboard packaging material in the form of a packaging material web or as a packaging material blank through various modules of the packaging material manufacturing machine. The conveyor module is connected to a controller of the packaging material manufacturing machine, which regulates the conveying speed of the conveyor module.

[0013] Within the packaging production machine, there is at least one adhesive module through which an aqueous, non-heat-activated adhesive containing ferromagnetic, ferrimagnetic, superparamagnetic, and / or piezoelectric particles is applied to at least one layer of the fiber-based paper and cardboard packaging material via an adhesive application valve of the adhesive module. This adhesive application valve is connected to the control system of the packaging production machine, which controls the adhesive application valve according to an adhesive pattern stored in the control system.

[0014] In particular, the control system of the packaging production machine receives a signal from the conveyor module that is proportional to the conveyor speed of the conveyor module, in particular from a rotary encoder integrated into the packaging production machine. This conveyor speed signal serves to determine the optimal time for activating and deactivating the adhesive application valve of the adhesive module in order to apply the at least one adhesive seam with precise positioning to the first layer of the fiber-based paper and cardboard packaging material.

[0015] Furthermore, the packaging material manufacturing machine comprises a transfer module designed to precisely place a second layer of the fiber-based paper and cardboard packaging material onto the first layer of the fiber-based paper and cardboard packaging material in the area of ​​the adhesive seam, thereby bringing it into contact with the adhesive seam. This transfer module can, in particular, comprise a pressing device designed to effectively press the two interconnected layers of the fiber-based paper and cardboard packaging material together in the area of ​​the adhesive seam.

[0016] The packaging material production machine further comprises a magnet module, which in particular has at least one induction head. The magnet module, or induction head, is designed to generate an alternating magnetic field and is connected to a magnet module controller, which is designed to control the induction head with variable field strengths or frequencies. The magnet module controller is connected in particular to the controller of the packaging material production machine.

[0017] The present invention describes a process for producing fiber-based paper or cardboard packaging material. The terms "paper" and "cardboard" in this context encompass a broad range of materials, including packaging papers such as kraft paper, cardboard such as folding boxboard, and corrugated board substrates. The substrate to be bonded, which is primarily used to construct the packaging and is referred to as "packaging material" or, in a processed state, also as "packaging material," consists of at least 80%, preferably at least 90%, and particularly preferably at least 95% paper fibers. The term "fibers" refers to all fibers obtained from renewable raw materials that are suitable for producing paper within the meaning of this invention in a packaging material manufacturing machine. Fibers can also be recyclates from waste paper.

[0018] The term “packaging material” refers to the substrate from which a “packaging medium” is made. The “packaging medium” is the packaging component that forms the main part of the packaging and is intended to hold the packaged goods. The packaging medium serves to partially or completely enclose the packaged goods and in its final state forms an open or closed hollow body. The packaging material is fed into the actual packaging process with varying degrees of prefabrication. A folding box is fed to the packaging process partially formed, erected, filled with the packaged goods and sealed. With a form-fill-seal machine, on the other hand, a tube is formed from the packaging material, one end of the tube is closed, the bag is filled and then the opposite end is sealed.

[0019] A feature of the fiber-based paper or cardboard packaging material described according to the invention is that at least one of the layers of the packaging material that are bonded together in the area of ​​the adhesive seam has an absorbent or porous surface. This surface is capable of absorbing the aqueous portion of the applied adhesive into the packaging material. This process of absorbing water by the packaging material is also referred to as "absorption" or "setting."

[0020] In the present invention, the term "packaging material" is used hereinafter, although it should be noted that, according to the definition of the invention, this term also includes "packaging means," which refers to pre-formed packaging elements. Packaging is defined as a unit comprising packaging means and packaging aids and serves to protect the packaged goods and to optimize handling during production and logistics. The packaging can be either primary packaging, secondary packaging, or transport packaging. Each of these packaging types has at least one adhesive seam produced using an adhesive. According to the present invention, the term "at least one adhesive seam" encompasses either a single adhesive seam or a plurality of adhesive seams.The term “adhesive seam” covers all types of adhesive joints, including small adhesive flaps that are closed, for example, with only a single adhesive point.

[0021] In the process according to the present invention, the adhesive is applied by the adhesive module either in portions or continuously to the first layer of the fiber-based paper or cardboard packaging material in the region of at least one adhesive seam. The adhesive used is aqueous and, in addition to the functional adhesive particles, also contains particles with ferromagnetic, ferrimagnetic, paramagnetic, and / or superparamagnetic properties, which are evenly dispersed in the adhesive, particularly in small quantities.

[0022] The particles with ferromagnetic, ferrimagnetic, paramagnetic, and / or superparamagnetic properties can also be applied to the fiber-based paper or cardboard packaging material immediately before or after the adhesive is applied. The particles can be sprayed on in solid form or applied in an aqueous solution and only bond with the adhesive once they are on the fiber-based paper or cardboard packaging material.

[0023] In the following, these particles having ferromagnetic, ferrimagnetic, piezoelectric and / or superparamagnetic properties in the aqueous adhesive according to the present invention are summarized under the term “magnetic”.

[0024] These particles can also comprise composites, forming a bond between the particles and an organic polymer and / or an inorganic substance. The particles can also comprise a matrix, wherein the matrix comprises magnetic, organic, and / or inorganic substances. Such compounds and matrix solutions are referred to as composites.

[0025] The magnetic particles used according to the present invention can be incorporated into the adhesive as individual, singular particles. In a preferred embodiment, these particles are of a so-called "core type." Corresponding "core-type" particles have a magnetic core, which may contain, for example, iron oxide, wherein the magnetic core is surrounded by an outer polymer shell. This outer polymer shell is shaped in particular such that the magnetic particles can be easily dispersed in the adhesive and remain in a stable state. The surface charge is crucial in maintaining the repulsion between the particles, with the surface charge depending on the surface of the outer polymer shell and the groups bonded to it.It is advantageous to provide functional substituents on the surface of the outer polymer shell to ensure the colloidal stability of the magnetic particles in the adhesive.

[0026] In addition, the outer polymer shell protects the magnetic core by preventing the magnetic core from interacting with water or any acids and bases present in the adhesive, which can prevent, for example, corrosion of the magnetic core. In particular, the magnetic particles have a surface modification of the metallic phase to impart hydrophilic properties to the magnetic particles for homogeneous and stable dispersion in water.

[0027] Among the various hydrophilic and biocompatible compounds that have been shown to be able to bind to the charged surface of the magnetic particles, sodium oleate, for example, is preferred due to its long aliphatic chain, which is advantageous for the steric stabilization of the colloidal suspension against magnetic dipole attraction forces.

[0028] Alternatively, the magnetic particles of the present invention can also be present as so-called "multicore particles," which means that they consist of several individual domains of magnetic materials, such as magnetite (Fe3O4), embedded in a polymer matrix. These two variants are referred to below as "core type."

[0029] In another embodiment, the magnetic particles, which may also comprise the core type, are chemically or physically bonded to other non-magnetic polymers of the dispersion. The physical bonds between the magnetic particles and the non-magnetic polymers of the dispersion may, for example, comprise weak van der Waals forces mediated by functional groups on the surface. The chemical bonds between the magnetic particles and the non-magnetic polymers of the dispersion may be provided by covalent bonds to functional groups on the surface.

[0030] The magnetic particles to be used in the present invention, or the inner core of a core particle, have magnetic, in particular ferromagnetic properties.

[0031] In a preferred embodiment of the invention, the magnetic particles therefore comprise at least one element selected from the group consisting of Fe, Co, Ni, Cr, Mo, W, V, Nb, Ta, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and / or alloys of two or more of said elements, and / or oxides of said elements, and / or ferrites of said elements, and / or a mixture of two or more of said elements.

[0032] For example, the magnetic particles may be magnetite, macchiemite, goethite or a ferrite of the general formula MeOFe2O3, where Me comprises an element selected from the group consisting of Mn, Co, Ni, Cu, Zn, Mg or Cd, or a mixture of two or more of the elements.

[0033] Also suitable for use as magnetic particles in the context of the present invention are materials such as wolframite (FeMnWO4), ferberite (FeWO4), permanently magnetic aluminum-nickel-cobalt alloys which contain the elements iron, cobalt, nickel, aluminum, copper or titanium or mixtures of two or more of these elements as main components.

[0034] Furthermore, alloys of platinum and cobalt, alloys of iron, cobalt, vanadium and chromium, ludwigite (Mg2FeBO5), vonsenite (Fe2 2+ Fe 3+ O2[BO3]), cobalt nickel pyrites of the general formula A 2+ B 3+ 2X 4-2, wherein A comprises an element selected from the group consisting of iron, cobalt, nickel or copper, wherein B comprises an element selected from the group consisting of iron, cobalt, nickel or chromium or a mixture of two or more of these elements, and wherein X comprises the elements S, Se or Te or a mixture of two or more of these elements, iron oxides such as iron (II) oxide (FeO) or iron (III) oxide (Fe2O3) in its ferromagnetic modification, Fe2O3 (macchiemite) with spinel, magnetite (Fe3O4), cobalt alloys such as the alloys with Co-Cr matrix commonly used as high-temperature materials, Ni-Fe-Al-Co casting alloys with up to about 36 wt.% cobalt, alloys of the type CoCrW, chromium (IV) oxide (CrO2), the oxide-ceramic materials of the general composition M2Fe which can be assigned to the group of ferrites. 3+2O4 or M2OFe2O3, which contain permanent magnetic dipoles, where M comprises the element zinc, cadmium, cobalt, manganese, iron, copper, magnesium and the like, as well as iron itself, are suitable.

[0035] The particles can also be piezoelectric particles.

[0036] The bonding process according to the present invention is carried out by applying the adhesive to the first layer of the fiber-based paper or cardboard packaging material on at least one adhesive seam, by producing the packaging material composite by bonding the second layer of the packaging material, and by setting the adhesive by applying an alternating magnetic field. The setting of the aqueous adhesive occurs through the absorption of water from the adhesive by the material of the packaging material and through the evaporation of the water content of the adhesive. These are physical processes. Bonding can also occur through an increase in viscosity due to swelling of polymers in the adhesive or gelatinization of the adhesive.

[0037] In the context of the present invention, the connection between the layers of the fiber-based paper or cardboard packaging material is expressly not achieved by thermoplastic joining, in which a temperature is generated in the region of the adhesive seam which exceeds the melting temperature of the polymers of the adhesive.

[0038] The adhesive is applied to the packaging material via the adhesive module or an adhesive application device of the adhesive module. The adhesive is preferably applied to the packaging material via an adhesive application valve as the adhesive application device, which is equipped with a valve to start or stop the adhesive application. The adhesive is applied to the surface of the packaging material, in particular through a nozzle. The adhesive is preferably applied contactlessly, by applying the adhesive to the desired surface of the packaging material via an air gap.

[0039] The next step in the process involves the bonding or joining process, in which two layers of packaging material are brought into contact with each other in the area of ​​the adhesive seam. Within this area of ​​the adhesive seam, the applied adhesive is located between these two layers of packaging material. The adhesive can be applied either completely, for example, in the form of a continuous adhesive line, or partially, such as by a single or multiple interrupted adhesive line (also known as "stitching"), or as a series of individual adhesive dots by the adhesive module.

[0040] The connecting or joining process can comprise a shaping step, such as folding or shaping the packaging material, such as a bag or a tube, wherein the two layers of the packaging material are brought into alignment with one another in the region of the at least one adhesive seam. Alternatively, within the scope of the present invention, two different packaging materials can be brought into alignment with one another in the region of the at least one adhesive seam. This can be achieved, for example, by bringing together a first packaging material web and a second packaging material web and joining them together in the region of the adhesive seam.

[0041] In the next step of the process, an alternating magnetic field is applied to the joined adhesive seam by the magnetic module. This has a multifaceted effect on improving the setting behavior of the adhesive layer formed by the at least one adhesive seam between the two layers of the packaging material.

[0042] In principle, the heating of the adhesive generated by the alternating magnetic field has a positive effect on its setting behavior and can reduce its viscosity, but in the case of bio-based materials such as starch, it can also increase its viscosity through gelatinization. A lower viscosity of the adhesive accelerates the absorption of water from the adhesive, i.e., the absorption of the water by the packaging material and the evaporation of the adhesive. A higher viscosity of the adhesive increases the initial adhesive strength (tack). This utilizes two effects: When an electrically conductive material is exposed to an alternating magnetic field, electrical eddy currents are induced in it. These eddy currents flow in closed loops within the material and generate heat through the material's ohmic resistance.

[0043] This effect is particularly pronounced in metals and conductive ceramics. Although piezoelectric materials are not heated by induction, piezoelectric materials can generate heat by converting electrical energy into mechanical vibrations. For example, quartz is one of the most common piezoelectric materials and is used in a wide variety of applications. Rochelle salt (NaKC4H4O6-4H2O) is a crystalline solid salt that exhibits strong piezoelectric properties. Barium titanate (BaTiO3) is a ceramic material that exhibits high piezoelectricity. Lead zirconate titanate (PZT, Pb[Zr x Ti 1-x ]O3) is one of the most commonly used piezoelectric ceramics and shows high piezoelectricity.

[0044] The application of piezoelectric materials is not limited to these examples. The alternating magnetic fields allow the magnetic or piezoelectric particles to vibrate preferentially in the dispersion, generating mechanical energy. This energy facilitates the separation of water molecules from other adhesive molecules and promotes the absorption or absorption of water into the packaging material surrounding the adhesive.

[0045] Furthermore, the vibrations generated in the piezoelectric particles or the eddy currents induced in the magnetic particles lead to the generation of heat, which heats the entire adhesive dispersion and thus accelerates the absorption and curing of the adhesive.

[0046] Furthermore, water has diamagnetic properties, exerting a force on the water molecules that causes them to move away from a correspondingly generated magnetic field. Applying an external alternating magnetic field creates a kind of pumping effect, depending on the strength of this alternating magnetic field. This further promotes the movement of the water molecules into the packaging material, resulting in the positive effect of the water component of the adhesive being absorbed more quickly into the packaging material, thus resulting in faster setting.

[0047] In ferro- or ferrimagnetic materials, heat is generated by the constant reorientation of the magnetic dipoles of the adhesive's water molecules when the adhesive is exposed to a changing magnetic field, which also generates heat within the adhesive. This effect is particularly relevant for ferrimagnetic ceramics such as ferrites. The field strength of the applied alternating magnetic field must be carefully controlled to prevent excessive mechanical stress and heat generation in the adhesive layer from leading to cohesive failure, and to avoid undesirable odor formation resulting from overheating of fiber-based paper substrates.

[0048] A packaging manufacturing machine according to the present invention is defined as a device capable of producing a package in partial or complete form from a given packaging material. A key feature of this packaging manufacturing machine is the use of at least two layers of the fiber-based paper or cardboard packaging material, which are bonded together in the region of at least one adhesive seam by applying an aqueous, non-heat-activated adhesive. This definition underscores the broad applicability of the solution of the present invention with respect to various packaging types and shapes and various packaging manufacturing machines.

[0049] A packaging material manufacturing machine can be a machine that transports a large number of packaging blanks through various processing stations using a conveyor module. In this process, a package is formed from each blank of the packaging material, with at least one adhesive seam being applied to the package, which joins the two layers of the blank together using the adhesive. The blanks are conveyed continuously, with the conveyor speeds being able to be varied as needed. A specific application example for this packaging material machine is folding box gluing machines, which are used to form folding box blanks and combine them into complete packages.An exemplary packaging machine for processing individual blanks, such as a folding box gluing machine, has in particular at least one sensor, such as a light sensor, which serves to detect the individual blank of the packaging material, for example by detecting the leading edge of the blank.

[0050] Depending on the signal provided by the sensor and taking into account other parameters such as the distance from the leading edge, also known as offset, the starting point of the adhesive application and, if applicable, the starting time of the activity of the magnetic module or induction head, which influences the adhesive application by means of an alternating magnetic field, are determined.

[0051] The sensor is connected in particular to a control system of the packaging production machine, in which the desired pattern for the adhesive application is stored in relation to the cut of the packaging. The control system of the packaging production machine is connected in particular to another sensor, for example a rotary encoder, wherein the another sensor is capable of detecting the conveying speed of the conveyor module of the packaging production machine. Depending on the determined conveying speed, the control system can determine both the start time and the end time of the respective adhesive application by the adhesive module and / or the start time and the end time of the activation of the magnetic module, in particular of the induction head.

[0052] A packaging manufacturing machine according to the present invention is a machine in which a prefabricated package is often erected into a three-dimensional shape, filled with the packaged product, and then, for example, an adhesive flap is joined to this connection using the process. One example of such a packaging manufacturing machine is a cartoner. There are also hybrid models in which packaging manufacturing and filling are combined, such as form-fill-and-seal packaging manufacturing machines.

[0053] The control of the magnetic module, in particular of the at least one induction head, for generating the alternating magnetic field can be achieved in various ways. In particular, the control of the magnetic module can be achieved together with the control of the adhesive module, in particular of the at least one adhesive application valve of the adhesive module, via a control system integrated into the packaging manufacturing machine.

[0054] Alternatively, the control of the magnetic module, in particular of the at least one induction head, can be carried out independently of the control of the packaging material manufacturing machine by a magnetic module control of the magnetic module itself, in which case the control of the packaging material manufacturing machine transmits a start and end signal to the magnetic module control for activating the magnetic module or provides a signal during the desired activity period of the magnetic module.

[0055] Another possibility is for the magnetic module controller of the magnetic module, in particular of the at least one induction head, to independently calculate the start and end times of the activation of the magnetic module. In this case, at least one conveyor speed signal of the conveyor module can be transmitted from the controller of the packaging material manufacturing machine or from a conveyor speed sensor to the magnetic module controller, so that the magnetic module controller calculates the optimal activity times of the magnetic module, in particular of the at least one induction head, based on the transmitted conveyor speed signal.

[0056] According to one embodiment, the application of the aqueous, non-heat-activatable adhesive to the at least one adhesive seam of the first layer of the fiber-based paper or cardboard packaging material by the adhesive module takes place in sections and / or the method comprises the further method step of activating the magnetic module by a control of the packaging material manufacturing machine when the at least one adhesive seam is located in the effective range of the magnetic module.

[0057] This achieves the technical advantage that, according to the first variant, a resource-saving application of the adhesive to the adhesive seam is achieved. According to the second variant, the controller is designed to activate the alternating magnetic field only when an adhesive area is located within the effective range of this alternating magnetic field. In all other cases, the alternating magnetic field is deactivated by the controller, thus avoiding unnecessary activation of the magnetic module.

[0058] In particular, the controller is designed to determine the effective range of the alternating magnetic field as a function of a conveying speed of the conveying module of the packaging material manufacturing machine provided by a further sensor, for example a rotary encoder.

[0059] According to one embodiment, the conveyor module is designed to displace the first layer of fiber-based paper or cardboard packaging material connected to the second layer at variable conveyor speeds under the magnet module, wherein the method comprises the further method step of adjusting the field strength and / or the frequency of the alternating magnetic field provided by the magnet module by a controller of the packaging material manufacturing machine depending on the conveyor speed of the paper or cardboard packaging material.

[0060] This achieves the technical advantage that by adjusting the alternating magnetic field depending on the conveying speed, the energy supplied to the adhesive can be kept constant. In particular, the controller is connected to another sensor, for example a rotary encoder, which is designed to provide the conveying speed of the conveyor module of the packaging production machine to the controller.

[0061] The exposure time of the alternating magnetic field and the resulting energy supplied to the adhesive per unit area vary depending on the conveyor speed of the conveyor module of the packaging production machine. The packaging production machine can often be operated at different conveyor speeds, for example, at a reduced conveyor speed in an initial phase until optimal adhesive application parameters are achieved, after which the packaging material is then conveyed at full conveyor speed.

[0062] In this case, the alternating magnetic field is generated in particular by at least one induction head, wherein this induction head comprises at least one excitation coil for generating the alternating magnetic field. A preferred configuration of the induction head enables operation with varying frequencies and field strengths of the magnetic field. The induction head is in particular connected to a magnetic head controller, which generates the excitation signal for the induction head. This magnetic head controller can either be implemented as an integral component of the induction head itself or be assigned to it.

[0063] According to one embodiment, the packaging material manufacturing machine has a control system in which an adhesive pattern to be applied by the adhesive module to the at least one adhesive seam is stored, and wherein the method comprises the further method step of positioning the magnetic module on the at least one adhesive seam of the fiber-based paper or cardboard packaging material depending on the adhesive pattern stored in the control system, in particular depending on the start time of the adhesive application, the end time of the adhesive application, and / or the conveying speed of the fiber-based paper or cardboard packaging material conveyed by the conveying module.

[0064] This provides the technical advantage of directly controlling the magnetic module depending on the specific adhesive pattern stored in the control system to be applied to the packaging material. Thus, the magnetic module, or rather the induction head, is controlled in this case by a control system of the packaging production machine that is separate from the magnetic module and controls at least one adhesive application valve of the adhesive module in addition to the induction head.

[0065] In particular, the magnetic module or induction head is integrated into the packaging manufacturing machine and aligned to specifically direct the alternating magnetic field onto at least one adhesive seam of the fiber-based paper or cardboard packaging material. The induction head can be spaced from the fiber-based paper or cardboard packaging material or, if the alternating magnetic field is applied after the joining process, can be in direct contact with the fiber-based paper or cardboard packaging material.

[0066] In particular, the control of the power or the frequency of the at least one excitation coil for generating the alternating magnetic field is preferably carried out as a function of the conveying speed of the conveying module of the packaging material manufacturing machine in order to avoid both insufficient and excessive energy supply to the adhesive layer.

[0067] In one embodiment, the control of the packaging material manufacturing machine is designed to activate the magnetic module for applying the alternating magnetic field only once the conveying speed of the fiber-based paper and cardboard packaging material conveyed by the conveying module has reached a threshold speed.

[0068] This achieves the technical advantage of saving energy and preventing overheating or cohesive failure of the bond at low packaging material conveying speeds. At lower conveying speeds below the threshold speed, the contact pressure after joining the packaging material layers should ideally be sufficiently long to allow sufficient curing of the adhesive layer. This ensures that the bonded seam does not open prematurely due to the restoring forces of the packaging material or due to the load from a filling material.

[0069] In packaging production machines such as folding carton gluing machines, it is advantageous to activate the alternating magnetic fields only when a packaging material is within the effective range of the magnetic field. This is achieved by detecting the individual blanks with sensors such as light sensors, and activating the alternating magnetic field along the entire length of the packaging material blank.

[0070] Alternatively, activation can only occur when an adhesive area, particularly an area in which adhesive has been applied to at least one layer of packaging material, is within the effective range of the alternating magnetic field. The pattern data of the adhesive application can be used to control the magnetic coils for generating the alternating magnetic field. The control system can set an offset, i.e., it is switched on shortly before the start of the adhesive application and / or switched off shortly after the end of the adhesive application. Alternatively, the adhesive can be applied using a disk gluing unit.

[0071] This ensures precise and efficient application of the alternating magnetic field only when it is actually needed. The integration of the magnetic coils as part of the induction heads in packaging production machines is crucial for bringing the alternating magnetic fields as close as possible to the formed adhesive seam.

[0072] At the same time, it may be necessary to place guide elements and forming elements, such as forming shoulders, in the packaging production machine to guide the packaging material. These elements, however, are preferably non-magnetic. It is also advantageous if these elements are made of stainless steel, since most stainless steels are non-magnetic.

[0073] In the area of ​​alternating magnetic fields, it is particularly possible to use plastics as an alternative to stainless steel for the guide elements and molded elements such as forming shoulders. These plastics can be coated with glass beads or other abrasion-resistant materials in areas where they may come into contact with the abrasive packaging material. The glass beads ensure, for example, that the material is not damaged upon contact with the abrasive packaging material. Furthermore, plastics are characterized by low thermal conductivity, which is an additional advantage in preventing heating caused by the alternating magnetic field.

[0074] In one embodiment, the magnetic module for applying the alternating magnetic field is activated after the two layers of the fiber-based paper and cardboard packaging material have been joined, which means that the magnetic field acts through at least one of the first and second layers of the packaging material.

[0075] This takes advantage of the fact that the paper or cardboard packaging material has no magnetic properties and cannot be magnetized by the alternating magnetic field. This allows the two packaging layers to already be in direct contact, and when the adhesive, which is arranged in the area of ​​at least one adhesive seam between the packaging layers, is activated, the water is quickly drawn from the adhesive gap into the packaging material, and the adhesive sets. This ensures that the adhesive adheres to the packaging layers in the joining area from the very beginning, when the alternating magnetic field acts on the adhesive gap after the joining process. This significantly increases the efficiency and quality of the joining process.

[0076] In one embodiment, the magnet module has at least one temperature detection device which is designed to detect a surface temperature of the fibre-based paper or cardboard packaging material in the region of the at least one adhesive seam, wherein the method comprises the further method step of comparing the detected surface temperature of the fibre-based paper or cardboard packaging material with a reference value by a controller of the packaging material manufacturing machine in order to determine a comparison result, and adjusting the field strength and / or the frequency of the alternating magnetic field provided by the magnet module by a controller of the packaging material manufacturing machine depending on the determined comparison result.

[0077] This achieves the technical advantage that overheating of the adhesive in the bonded seam is avoided by an effective temperature-dependent adjustment of the field strength and / or the frequency of the alternating magnetic field.

[0078] For example, the magnetic module or the induction head can also be controlled based on a temperature target value of the surface of the fiber-based paper or cardboard packaging material. In particular, a temperature sensor is arranged downstream of the magnetic module or the induction head in the conveying direction of the packaging material. This temperature sensor is designed to detect the surface temperature of the paper or cardboard packaging material in the area of ​​the adhesive seam. The control system of the packaging material manufacturing machine can compare the temperature value detected by the temperature sensor with a temperature target value.

[0079] If the actual temperature value detected by the temperature sensor deviates from the temperature setpoint, the controller can be configured to adjust the field strength and / or frequency of the alternating magnetic field. In packaging production machines with variable conveyor speeds, the temperature setpoint is particularly variable and depends on the respective conveyor speed of the conveyor module. If the deviation of the actual temperature value from the temperature setpoint is too large, the bonding of the fiber-based paper or cardboard packaging material is rated as "poor." The fiber-based paper or cardboard packaging material is ejected at the end of the process.

[0080] With a fixed installation location for the induction head and temperature sensor, there is only a short period of time required for a point on the packaging material to be conveyed from the position at the induction head to the position at the temperature sensor. Due to the delayed heat conduction through the packaging material, less time remains for the corresponding heat input to spread across the surface of the packaging material. Therefore, the temperature setpoint can be adjusted by the controller, particularly depending on a linear or non-linear characteristic curve. When determining the temperature setpoint, other parameters, such as the thickness of the packaging material or the thermal conductivity of the packaging material, can also be taken into account.

[0081] In one embodiment, the packaging material manufacturing machine has a control system in which the melting temperature or degradation temperature of the polymeric components of the aqueous, non-heat-activatable adhesive are stored, wherein the application of the alternating magnetic field is predetermined by the control system in such a way that the temperature of the aqueous, non-heat-activatable adhesive does not exceed the melting temperature of the polymeric components of the aqueous, non-heat-activatable adhesive.

[0082] This achieves the technical advantage that the aqueous, non-heat-activated adhesive according to the present invention is not a hot melt adhesive, but a cold glue, wherein melting of the polymeric components of the adhesive is prevented by means of temperature control by controlling the temperature below the melting temperature of the polymeric components of the adhesive.

[0083] According to a second aspect, the above-mentioned object is achieved by a packaging material manufacturing machine for joining two layers of a fiber-based paper or cardboard packaging material, comprising: a conveyor module for conveying at least one layer of the fiber-based paper or cardboard packaging material; an adhesive module for applying an aqueous, non-heat-activatable adhesive comprising ferromagnetic, ferrimagnetic, superparamagnetic, and / or piezoelectric particles; a displacement module for displacing layers of the fiber-based paper or cardboard packaging material; and a magnet module for applying an alternating magnetic field, wherein the conveyor module is designed to convey a first layer of the fiber-based paper or cardboard packaging material; wherein the adhesive module is designed to apply the aqueous, non-heat-activatable adhesive to at least one adhesive seam of the first layer of the fiber-based paper or cardboard packaging material.wherein the displacement module is configured to connect a second layer of the fiber-based paper or cardboard packaging material to the at least one adhesive seam of the first layer of the fiber-based paper or cardboard packaging material; and wherein the magnet module is configured to apply an alternating magnetic field in the region of the at least one adhesive seam between the first and second layers of the fiber-based paper or cardboard packaging material in order to effect effective physical setting of the aqueous adhesive layer between the first and second layers of the fiber-based paper or cardboard packaging material and to accelerate effective bonding between the first and second layers of the fiber-based paper or cardboard packaging material.

[0084] This provides the technical advantage of achieving effective bonding of the first and second layers of the fiber-based paper or cardboard packaging material.

[0085] According to an advantageous embodiment, the packaging material manufacturing machine has a controller which is designed to activate the conveyor module for conveying the first layer of the fiber-based paper or cardboard packaging material at a variable conveyor speed, and wherein the packaging material manufacturing machine has a conveyor speed detection device, in particular a rotary encoder, which is connected to the controller for control purposes.

[0086] This achieves the technical advantage that the residence time of the adhesive seam in the effective range of the alternating magnetic field is advantageously optimized by effectively adjusting the conveying speed.

[0087] According to an advantageous embodiment, the packaging material manufacturing machine has a control system in which an adhesive pattern to be applied by the adhesive module to the at least one adhesive seam is stored, and wherein the control system is designed to position the magnetic module on the at least one adhesive seam of the paper or cardboard packaging material depending on the stored adhesive pattern, in particular depending on the start time of the adhesive application, the end time of the adhesive application, and / or the conveying speed of the paper or cardboard packaging material.

[0088] This achieves the technical advantage that the energy provided by the alternating magnetic field and introduced into the adhesive can be effectively regulated by appropriate, advantageous positioning of the magnetic module.

[0089] The exemplary embodiments mentioned with respect to the method according to the first aspect are also exemplary embodiments for the product producible by the method, and with respect to the packaging material manufacturing machine according to the second aspect, and vice versa.

[0090] Embodiments of the invention are illustrated in the drawings and are described in more detail below.

[0091] They show: Fig. 1 a schematic representation of a packaging material manufacturing machine for joining two layers of a fiber-based paper or cardboard packaging material according to an embodiment; Fig. 2 a schematic representation of a packaging manufacturing machine for joining two layers of a fiber-based paper or cardboard packaging material according to a comparative example; Fig. 3 a schematic representation of a fiber-based paper or cardboard packaging material before bonding according to an embodiment; Fig. 4 is a schematic representation of a magnetic particle in an aqueous, non-heat-activatable adhesive according to an embodiment; and Fig. 5 a schematic representation of a method for joining layers of a fiber-based paper or cardboard packaging material according to an embodiment.

[0092] In the following detailed description, reference is made to the accompanying drawings, which form a part hereof, and in which is shown by way of illustration specific embodiments in which the invention may be practiced. It is understood that other embodiments may be utilized and structural or logical changes may be made without departing from the scope of the present invention. The following detailed description, therefore, is not to be taken in a limiting sense. Further, it is to be understood that the features of the various embodiments described herein may be combined with one another unless specifically indicated otherwise.

[0093] The aspects and embodiments are described with reference to the drawings, where like reference numerals generally refer to like elements. In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more aspects of the invention.

[0094] Fig. 1 shows a schematic representation of a packaging material manufacturing machine for joining two layers of a fiber-based paper or cardboard packaging material according to an embodiment.

[0095] The packaging manufacturing machine 100 is in the Fig. 1 is shown only schematically and allows layers 101a, 101b of fiber-based paper or cardboard packaging material 101 to be connected to each other. Even if in the Fig. 1 only shows two layers 101a, 101b of the fiber-based paper or cardboard packaging material 101 by way of example, the packaging material manufacturing machine 100 is obviously designed to connect more than two layers 101a, 101b of the fiber-based paper or cardboard packaging material 101 to one another.

[0096] In the Fig. 1 shows a conveyor module 103, in particular a conveyor belt, of the packaging material manufacturing machine 100, which is designed to convey a first layer 101a of the fiber-based paper or cardboard packaging material 101 along a conveying direction 105.

[0097] The packaging material manufacturing machine 100 further comprises an adhesive module 107, which is designed to apply an aqueous, non-heat-activatable adhesive 109 to the conveyed first layer 101a of the fiber-based paper or cardboard packaging material 101. Fig. 1 schematically shows that the applied aqueous, non-heat-activatable adhesive 109 comprises ferromagnetic, ferrimagnetic, superparamagnetic and / or piezoelectric particles 111.

[0098] As in the Fig. 1 is shown only schematically, the adhesive module 107 applies the aqueous, non-heat-activatable adhesive 109 to at least one adhesive seam 113 of the first layer 101a.

[0099] Furthermore, the packaging manufacturing machine 100 has a Fig. 1 only schematically indicated displacement module 115, which is designed to connect a second layer 101b of the fiber-based paper or cardboard packaging material 101 to the at least one adhesive seam 113 of the first layer 101a of the fiber-based paper or cardboard packaging material 101.

[0100] Even if that is in the Fig. 1 is not shown, the displacement module 115 can comprise a folding device, a forming device or a merging device which is designed to fold, form or feed the second layer 101b in the direction of the adhesive seam 113 on the first layer 101a in order to obtain an effective connection between the first and second layers 101a, 101b of the fiber-based paper or cardboard packaging material 101 at the at least one adhesive seam 113.

[0101] Subsequently, the conveyor module 103 conveys the fiber-based paper or cardboard packaging material 101 into the area of ​​a magnet module 117 of the packaging material manufacturing machine 100. The magnet module 117 is configured to apply an alternating magnetic field 119 through at least one of the first and second layers 101a, 101b in the area of ​​the at least one adhesive seam 113. This physically sets the aqueous adhesive layer between the first and second layers 101a, 101b of the fiber-based paper or cardboard packaging material 101.

[0102] Alternatively, two blanks of the fiber-based paper or cardboard packaging material 101 or two webs of the fiber-based paper or cardboard packaging material 101 can be arranged one above the other and joined together in the area of ​​the adhesive seam 113 using these joining processes. These process steps enable precise and effective bonding of packaging materials using an aqueous adhesive 109 with magnetic particles 111. Both alternative variants of joining two adhesive layers are subsumed under the term joining or joining process.

[0103] The fiber-based paper or cardboard packaging material 101 can include both a single-piece packaging material 101 in which the layers 101a, 101b have been aligned in the area of ​​the adhesive seam 113 by a folding process, and can also comprise two separate packaging material webs or packaging material blanks arranged one above the other. The materials of the first and second layers 101a, 101b of the fiber-based paper or cardboard packaging material 101 can be identical or different. It is crucial that at least one layer 101a, 101b of the packaging material 101 is fiber-based and capable of absorbing the water from the adhesive 109.

[0104] In the Fig. 5, the individual process steps carried out by the packaging manufacturing machine 100 are schematically shown as follows.

[0105] The first method step comprises conveying 201 a first layer 101a of the fiber-based paper or cardboard packaging material 101 through the conveying module 103.

[0106] The second method step comprises the application 203 of the aqueous, non-heat-activatable adhesive 109 to at least one adhesive seam 113 of the first layer 101a of the fiber-based paper or cardboard packaging material 101 by the adhesive module 107.

[0107] The third method step comprises the joining 205 of a second layer 101b of the fiber-based paper or cardboard packaging material 101 at the at least one adhesive seam 113 of the first layer 101a of the fiber-based paper or cardboard packaging material 101 by the displacement module 115. In this case, optionally, a pressing of the first and second layers 101a, 101b of the fiber-based paper or cardboard packaging material 101 is carried out in the region of the adhesive seam 113.

[0108] The fourth method step comprises the physical setting 207 of the aqueous adhesive layer between the first and second layers 101a, 101b of the fiber-based paper or cardboard packaging material 101 by applying an alternating magnetic field 119 through at least one of the first and second layers 101a, 101b in the region of the at least one adhesive seam 113 by the magnet module 117 in order to accelerate an effective bonding between the first and second layers 101a, 101b of the fiber-based paper or cardboard packaging material 101.

[0109] Here, the magnetic field 119 is generated by at least one induction head of the magnetic module 117. A key characteristic of this method is that the magnetic field 119 acts through at least one layer 101a, 101b onto the aqueous adhesive 109 located between the two layers 101a, 101b of the fiber-based paper or cardboard packaging material 101.

[0110] Fig. 2 shows a schematic representation of a packaging material manufacturing machine for joining two layers of a fiber-based paper or cardboard packaging material 101 according to a comparative example.

[0111] The procedure according to Fig. 2 differs from the procedure in Fig. 1 in that the working step 207, the application of the alternating magnetic field 119 to the aqueous adhesive 109, takes place before the joining 205 of the second layer 101b of the fiber-based paper and cardboard material at the adhesive seam 113 of the first layer 101a of the fiber-based paper and cardboard material 101.

[0112] Thus, the alternating magnetic field 119 in the Fig. 2, the adhesive is therefore applied to the unprotected aqueous adhesive 109, which has not yet been included in the joining process. Due to this deviation, the adhesive 109 is already influenced by the alternating magnetic field 119 before the packaging material layers 101a, 101b are actually joined, which can potentially produce different properties and effects on the adhesive 109 in the area of ​​the adhesive seam 113.

[0113] This prior art method has several disadvantages compared to the method of the present invention. In particular, there is a risk that the adhesive 109 will "overdry" and lose its tackiness. Fig. 3 shows a schematic representation of a fiber-based paper or cardboard packaging material before bonding according to an embodiment.

[0114] The Fig. The fiber-based paper or cardboard packaging material 101 shown in Figure 3 is in the form of a folding box blank. Here, an adhesive seam 113 of the fiber-based paper or cardboard packaging material 101 marks a specifically defined area of ​​the packaging material 101. This adhesive seam 113 enables the two opposing layers 101a, 101b of the packaging material 101 to be joined together. It is important to note that this example is not limited to folding boxes, but can also be applied to other forms of packaging.

[0115] Fig. 4 shows a schematic representation of a magnetic particle in an aqueous, non-heat-activatable adhesive according to an embodiment.

[0116] In Fig. 4 shows a magnetic particle 111 of the "core" type, consisting of a magnetic or magnetizable core 121. This core is surrounded by at least one shell 123 made of a different material, which shell 123 can be, for example, a polymer coating. The shell 123 is specifically modified to optimize the dispersion of the magnetic particle 111 in the adhesive dispersion 109. This modification can include adjusting the surface tension of the outer shell 123 or introducing active groups that ensure the stability of the magnetic particle 111 in the aqueous adhesive dispersion 109. The modification can be achieved by one or more active groups that enable crosslinking with other components in the adhesive 109. Preferably, the crosslinking of the magnetic particle 111 with another active component of the aqueous adhesive dispersion takes place before its dispersion.In one embodiment, the magnetic particle 111 may be crosslinked with a sticky component of the adhesive 109.

[0117] Fig. 5 shows a schematic representation of a method for joining layers of a fiber-based paper or cardboard packaging material according to an embodiment.

[0118] The method 200 comprises, as a first method step, the conveying 201 of a first layer 101a of the fiber-based paper or cardboard packaging material 101 through the conveying module 103.

[0119] The method 200 comprises, as a second method step, the application 203 of the aqueous, non-heat-activatable adhesive 109 to at least one adhesive seam 113 of the first layer 101a of the fiber-based paper or cardboard packaging material 101 by the adhesive module 107.

[0120] The method 200 comprises, as a third method step, the joining 205 of a second layer 101b of the fiber-based paper or cardboard packaging material 101 to the at least one adhesive seam 113 of the first layer 101a of the fiber-based paper or cardboard packaging material 101 by the displacement module 115.

[0121] The method 200 comprises, as a third method step, the physical setting 207 of the aqueous adhesive layer between the first and second layers 101a, 101b of the fiber-based paper or cardboard packaging material 101 by applying an alternating magnetic field 119 through at least one of the first and second layers 101a, 101b in the region of the at least one adhesive seam 113 by the magnet module 117 in order to accelerate an effective bond between the first and second layers 101a, 101b of the fiber-based paper or cardboard packaging material 101.

Claims

[1] Method (200) for joining layers (101a, 101b), in particular two layers (101a, 101b), of a fiber-based paper or cardboard packaging material (101) by a packaging material manufacturing machine (100), wherein the packaging material manufacturing machine (100) comprises a conveyor module (103) for conveying at least one layer (101a, 101b) of the fiber-based paper or cardboard packaging material (101), an adhesive module (107) for applying aqueous, non-heat-activatable adhesive (109) comprising ferromagnetic, ferrimagnetic, superparamagnetic and / or piezoelectric particles (111), a displacement module (115) for displacing layers (101a, 101b) of the fiber-based paper or cardboard packaging material (101), and a magnet module (117) for applying an alternating magnetic field (119), wherein the fiber-based paper or cardboard packaging material (101) is designed to absorb water from the aqueous, non-heat-activatable adhesive (109), characterized bythat the method (200) comprises the following method steps: Conveying (201) a first layer (101a) of the fiber-based paper or cardboard packaging material (101) through the conveying module (103); Applying (203) the aqueous, non-heat-activatable adhesive (109) to at least one adhesive seam (113) of the first layer (101a) of the fiber-based paper or cardboard packaging material (101) by the adhesive module (107); Connecting (205) a second layer (101b) of the fiber-based paper or cardboard packaging material (101) to the at least one adhesive seam (113) of the first layer (101a) of the fiber-based paper or cardboard packaging material (101) by the displacement module (115); and Physically setting (207) the aqueous adhesive layer between the first and second layers (101a, 101b) of the fiber-based paper or cardboard packaging material (101) by applying an alternating magnetic field (119) through at least one of the first and second layers (101a, 101b) in the region of the at least one adhesive seam (113) by the magnet module (117) in order to accelerate effective bonding between the first and second layers (101a, 101b) of the fiber-based paper or cardboard packaging material. [2] Method (200) according to claim 1, characterized bythat the application (203) of the aqueous, non-heat-activatable adhesive (109) to the at least one adhesive seam (113) of the first layer (101a) of the fiber-based paper or cardboard packaging material (101) is carried out in sections by the adhesive module (107) and / or wherein the method comprises the further method step of activating the magnetic module (117) by a controller of the packaging material manufacturing machine (100) when the at least one adhesive seam (113) is located in the effective range of the magnetic module (117). [3] Method (200) according to claim 1 or 2, characterized byin that the conveying module (103) is designed to displace the first layer (101a) of the fiber-based paper or cardboard packaging material (101), which is connected to the second layer (101b), at variable conveying speeds under the magnet module (117), and wherein the method comprises the further method step of adjusting the field strength and / or the frequency of the alternating magnetic field (119) provided by the magnet module (117) by means of a controller of the packaging material manufacturing machine (100) as a function of the conveying speed of the paper or cardboard packaging material (101). [4] Method (200) according to one of the preceding claims, characterized byin that the packaging material manufacturing machine (100) has a control system in which an adhesive pattern to be applied by the adhesive module (107) to the at least one adhesive seam (113) is stored, and wherein the method comprises the further method step of positioning the magnet module (117) on the at least one adhesive seam (113) of the fiber-based paper or cardboard packaging material (101) depending on the adhesive pattern stored in the control system, in particular depending on the start time of the adhesive application, the end time of the adhesive application, and / or the conveying speed of the fiber-based paper or cardboard packaging material (101) conveyed by the conveying module (103). [5] Method (200) according to one of the preceding claims, characterized byin that the magnet module (117) has at least one temperature detection device which is designed to detect a surface temperature of the fibre-based paper or cardboard packaging material (101) in the region of the at least one adhesive seam (113), wherein the method comprises the further method steps of comparing the detected surface temperature of the fibre-based paper or cardboard packaging material (101) with a reference value by means of a controller of the packaging material manufacturing machine (100) in order to determine a comparison result, and adapting the field strength and / or the frequency of the alternating magnetic field (119) provided by the magnet module (117) by means of a controller of the packaging material manufacturing machine (100) depending on the determined comparison result. [6] Method (200) according to one of the preceding claims, characterized bythat the packaging material manufacturing machine (100) has a control system in which the melting temperature of the polymeric components of the aqueous, non-heat-activatable adhesive (109) is stored, wherein the application of the alternating magnetic field (119) is predetermined by the control system in such a way that the temperature of the aqueous, non-heat-activatable adhesive (109) does not exceed the melting temperature of the polymeric components of the aqueous, non-heat-activatable adhesive (109). [7] Packaging material manufacturing machine (100) for joining layers (101a, 101b), in particular two layers (101a, 101b), of a fiber-based paper or cardboard packaging material (101), comprising: a conveyor module (103) for conveying at least one layer (101a, 101b) of the fiber-based paper or cardboard packaging material (101); an adhesive module (107) for applying an aqueous, non-heat-activatable adhesive (109) comprising ferromagnetic, ferrimagnetic, superparamagnetic, and / or piezoelectric particles (111); a displacement module (115) for displacing layers (101a, 101b) of the fiber-based paper or cardboard packaging material (101); and a magnet module (117) for applying an alternating magnetic field (119), wherein the conveying module (103) is designed to convey a first layer (101a) of the fiber-based paper or cardboard packaging material (101); wherein the adhesive module (107) is designed to apply the aqueous, non-heat-activatable adhesive (109) to at least one adhesive seam (113) of the first layer (101a) of the fiber-based paper or cardboard packaging material (101); wherein the displacement module (115) is designed to fix a second layer (101b) of the fiber-based paper or cardboard packaging material (101) to the at least one adhesive seam (113) of the first layer (101a) of the fiber-based paper or cardboard packaging material (101). cardboard packaging material (101); and wherein the magnet module (117) is designed to apply an alternating magnetic field (119) in the region of the at least one adhesive seam (113) between the first and second layers (101a, 101b) of the fiber-based paper or cardboard packaging material (101) in order to bring about an effective physical setting of the aqueous adhesive layer between the first and second layers (101a, 101b) of the fiber-based paper or cardboard packaging material (101) and to accelerate an effective bonding between the first and second layers (101a, 101b) of the fiber-based paper or cardboard packaging material (101). [8] Packaging manufacturing machine (100) according to claim 7, characterized byin that the packaging material manufacturing machine (100) has a controller which is designed to activate the conveyor module (103) for conveying the first layer (101a) of the fiber-based paper or cardboard packaging material (101) at a variable conveyor speed, and wherein the packaging material manufacturing machine (100) has a conveyor speed detection device, in particular a rotary encoder, which is connected to the controller for control purposes. [9] Packaging manufacturing machine (100) according to claim 8, characterized byin that the packaging material manufacturing machine (100) has a control system in which an adhesive pattern to be applied by the adhesive module (107) to the at least one adhesive seam (113) is stored, and wherein the control system is designed to position the magnetic module (117) on the at least one adhesive seam (113) of the paper or cardboard packaging material (101) depending on the stored adhesive pattern, in particular depending on the start time of the adhesive application, the end time of the adhesive application, and / or the conveying speed of the paper or cardboard packaging material (101).

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