Method and packaging means manufacturing machine for joining layers of a fibre-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 a magnetic alternating 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 process (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); applying (203) 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) through the adhesive module (107); joining (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) through the transfer 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) through the magnetic module (117) in the area of ​​at least one adhesive seam (113) 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 by means of 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 therefore finite, resources. The desire for more sustainable production processes is giving bio-based adhesives, derived from renewable raw materials, a new significance. Examples of such bio-based adhesives include those that rely primarily on starch, dextrin, lignin, or other natural, renewable raw materials or mixtures thereof. However, these bio-based adhesives have the disadvantage of requiring a longer setting time than synthetic adhesives.

[0003] One reason for this is 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 dispersion agent being absorbed as quickly as possible by the porous substrate or evaporating. This removal of water from the adhesive leads to film formation and thus to the development of the adhesive's stickiness.This process is slower for bio-based adhesives made from renewable raw materials than for synthetic adhesives, so that when using bio-based adhesives the efficiency of producing bonded packaging materials by a manufacturing machine is limited, as the conveying speed of the manufacturing machine often has to be reduced 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 resources are more environmentally friendly because they do not rely on finite fossil resources. Furthermore, fluctuating oil prices also affect the prices of petroleum-based products manufactured by the petrochemical industry, which in turn influences the cost of adhesives. The planned and projected increase in CO₂ pricing will further raise the cost 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 towards sustainable industrial production. However, bio-based adhesives derived from renewable resources have a longer curing time compared to synthetic adhesives, which affects the production of bonded packaging materials.

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

[0007] 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-activated adhesive is advantageously reduced.

[0008] The problem is solved 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 manufacturing machine, wherein the packaging manufacturing machine has a conveying module for conveying at least one layer of the fiber-based paper or cardboard packaging material, an adhesive module for applying aqueous, non-heat-activated 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 magnetic module for applying an alternating magnetic field, wherein the fiber-based paper or cardboard packaging material is configured to absorb water from the aqueous, non-heat-activated adhesive, characterized in thatthat the process comprises the following process steps: conveying a first layer of the fiber-based paper or cardboard packaging material through the conveying module; applying the aqueous, non-heat-activated adhesive to at least one adhesive seam of the first layer of the fiber-based paper or cardboard packaging material by the adhesive module; joining 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 transfer module; and physically curing 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 area 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.

[0009] This achieves the technical advantage that the setting time of the aqueous, non-heat-activated adhesive, or cold glue, can be advantageously reduced, thereby accelerating the setting process of aqueous cold glues for adhesives based on synthetic or bio-based, renewable or synthetic raw materials, and allowing the stickiness of the adhesive layer between the layers of the fiber-based paper or cardboard packaging material to develop more quickly.

[0010] 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 large number 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.

[0011] The packaging material manufacturing machine according to the present invention comprises a conveying module which, preferably continuously, transports at least one layer of the fiber-based paper and cardboard packaging material, in the form of a web or as a blank, through various modules of the packaging material manufacturing machine. The conveying module is connected to a control system of the packaging material manufacturing machine which regulates the conveying speed of the conveying module.

[0012] Within the packaging material manufacturing machine is at least one adhesive module through which an aqueous, non-heat-activated adhesive containing ferromagnetic, ferrimagnetic, superparamagnetic, and / or piezoelectric particles is applied via an adhesive application valve of the adhesive module to at least one layer of the fiber-based paper and cardboard packaging material. This adhesive application valve is connected to the control system of the packaging material manufacturing machine, which controls the adhesive application valve according to an adhesive pattern stored in the control system.

[0013] In particular, the control system of the packaging material manufacturing machine receives a signal from the conveyor module that is proportional to the conveyor module's conveying speed, specifically from a rotary encoder integrated into the packaging material manufacturing machine. This conveying speed signal serves to determine the optimal time for activating and deactivating the adhesive application valve of the adhesive module in order to apply at least one adhesive bead with precise positioning to the first layer of the fiber-based paper and cardboard packaging material.

[0014] Furthermore, the packaging manufacturing machine features a transfer module designed to precisely place a second layer of the fiber-based paper and cardboard packaging material onto the first layer in the area of ​​the adhesive seam, thereby bringing it into contact with the adhesive seam. This transfer module may, in particular, include a pressing device designed to effectively press the two bonded layers of the fiber-based paper and cardboard packaging material together in the area of ​​the adhesive seam.

[0015] The packaging material manufacturing machine further comprises a magnetic module, which in particular includes at least one induction head. The magnetic module, or the induction head, is configured to generate an alternating magnetic field and is connected to a magnetic module control unit configured to control the induction head with variable field strengths or frequencies, wherein the magnetic module control unit is in particular connected to the control unit of the packaging material manufacturing machine.

[0016] The present invention describes a method for producing fiber-based paper or cardboard packaging material. The terms "paper" and "cardboard" in this context encompass a wide 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 for constructing 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 recycled paper.

[0017] The term "packaging material" refers to the substrate from which a "packaging medium" is formed. The "packaging medium" is the packaging component that forms the main part of the packaging and is designed to hold the goods being packaged. The packaging medium serves to partially or completely enclose the goods and, in its final state, forms an open or closed hollow body. The packaging medium is introduced to the actual packaging process at varying degrees of prefabrication. A folding carton is partially formed before being introduced to the packaging process, erected, filled with the goods, and sealed. In contrast, a form-fill-seal machine forms a tube from the packaging material, closes one end of the tube, fills the bag, and then seals the opposite end.

[0018] 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, which are joined together in the area of ​​the adhesive seam, has an absorbent or porous surface. This surface is able to absorb the aqueous component of the applied adhesive into the packaging material. This absorption process of water by the packaging material is also referred to as "absorption" or "setting."

[0019] In the present invention, the term "packaging material" is used below, whereby it should be noted that, according to the definition of the invention, this term also includes "packaging elements," which refers to pre-formed packaging components. Packaging is defined as a unit consisting of packaging elements 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 types of packaging has at least one adhesive seam produced using an adhesive. According to the present invention, the term "at least one adhesive seam" includes either a single adhesive seam or a plurality of adhesive seams.The term "adhesive seam" encompasses all types of adhesive connections, including small adhesive tabs that are sealed with, for example, only a single dot of glue.

[0020] In the process according to the present invention, the adhesive is applied by the adhesive module, either portionwise or continuously, to the first layer of the fiber-based paper or cardboard packaging material in the area of ​​the 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 dispersed uniformly in the adhesive, particularly in small quantities.

[0021] The particles with ferromagnetic, ferrimagnetic, paramagnetic and / or superparamagnetic properties can also be applied directly before or after the adhesive is applied to the fiber-based paper or cardboard packaging material. 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.

[0022] In the following, these particles exhibiting ferromagnetic, ferrimagnetic, piezoelectric and / or superparamagnetic properties in the aqueous adhesive according to the present invention are collectively referred to as "magnetic".

[0023] These particles can also include composites, such that corresponding composites form a bond between the particles and an organic polymer and / or an inorganic material. The particles can also include a matrix, the matrix comprising magnetic, organic, and / or inorganic materials. Such compounds and matrix solutions are referred to as composites.

[0024] The magnetic particles used according to the present invention can be introduced into the adhesive as individual, singular particles. In a preferred embodiment, these particles have a so-called "core type." Corresponding "core type" particles have a magnetic core, which may, for example, contain 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 for maintaining the repulsion between the particles, and this surface charge depends on the surface of the outer polymer shell and the groups bound to it.

[0025] 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] Furthermore, the outer polymer shell protects the magnetic core by preventing it from interacting with water or any acids and bases present in the adhesive, thus preventing corrosion of the magnetic core. In particular, the magnetic particles feature a surface modification of the metallic phase to give them hydrophilic properties for homogeneous and stable dispersion in water.

[0027] Among the various hydrophilic and biocompatible compounds that have proven capable of binding to the charged surface of magnetic particles, sodium oleate, for example, is preferred due to its long aliphatic chain, which is advantageously suited 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 in the form of so-called "multicore particles", which means that they consist of several individual domains of magnetic materials, such as magnetite (Fe3O4), which are embedded in a polymer matrix. These two variants are hereinafter referred to as the "core type".

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

[0030] The magnetic particles to be used within the scope of 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 the aforementioned elements, and / or oxides of the aforementioned elements, and / or ferrites of the aforementioned elements, and / or a mixture of two or more of the aforementioned elements.

[0032] For example, the magnetic particles can be magnetite, macchiemite, goethite or a ferrite of the general formula MeOFe 2 O 3 , 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] Materials such as wolframite (FeMnWO 4 ), ferberite (FeWO 4 ), permanent magnetic aluminium-nickel-cobalt alloys, which contain as their main components the elements iron, cobalt, nickel, aluminium, copper or titanium or mixtures of two or more of these elements, are also suitable for use as magnetic particles within the scope of the present invention.

[0034] Furthermore, alloys of platinum and cobalt, alloys of iron, cobalt, vanadium and chromium, ludwigite (Mg₂FeBO₅), vonsenite (Fe₂²⁺ < Fe³⁺ < O₂[BO₃]), cobalt-nickel pyrites of the general formula A²⁺ < B³⁺ < 2 X⁴⁻ < 2, where A comprises an element selected from the group iron, cobalt, nickel or copper, where B comprises an element selected from the group iron, cobalt, nickel or chromium or a mixture of two or more of these elements, and where 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 those commonly referred to as High-temperature materials include alloys with Co-Cr matrix, Ni-Fe-Al-Co casting alloys with up to approximately 36 wt.-% Cobalt, alloys of type CoCrW, chromium (IV) oxide (CrO 2 ), the oxide ceramic materials belonging to the group of ferrites of the general composition M 2 Fe 3+< 2 O 4 or M 2 OFe 2 O 3 , which contain permanent magnetic dipoles, wherein M includes the element zinc, cadmium, cobalt, manganese, iron, copper, magnesium and the like, as well as iron itself, 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 at least at one adhesive seam, by creating the packaging composite by bonding the second layer of the packaging material, and by curing the adhesive by applying an alternating magnetic field. The curing of the aqueous adhesive occurs through the absorption of water from the adhesive by 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 area of ​​the adhesive seam that 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. Preferably, the adhesive is applied to the packaging material via an adhesive application valve, which is equipped with a valve to start or stop the application process. The adhesive is applied to the surface of the packaging material, particularly through a nozzle. The adhesive application is preferably contactless, as the adhesive is applied 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 the packaging material are brought into contact at the adhesive seam. Within this area of ​​the adhesive seam, the applied adhesive is located between these two layers of the packaging material. The adhesive can be applied either completely, for example, as a continuous bead of adhesive, or partially, such as through a single or multiple interrupted line of adhesive, also known as "stitching," or as a series of individual dots of adhesive applied by the adhesive module.

[0040] The joining process can include a forming step, such as folding or shaping the packaging material, for example a bag or a tube, wherein the two layers of the packaging material are brought into alignment with each other in the area of ​​the at least one adhesive seam. Alternatively, within the scope of the present invention, two different packaging materials can be brought into alignment in the area 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 bonding them together in the area of ​​the adhesive seam.

[0041] In the next step of the process, an alternating magnetic field is applied to the bonded adhesive seam by the magnetic module. This has a multifaceted effect on improving the curing 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 caused by the alternating magnetic field has a positive effect on its setting behavior and can lead to a decrease in viscosity, but also, in the case of bio-based materials such as starch, an increase in viscosity through gelatinization. A lower viscosity of the adhesive accelerates the absorption of water by the packaging material and the evaporation of the adhesive. A higher viscosity of the adhesive increases the initial tack. This process utilizes two effects: When an electrically conductive material is exposed to an alternating magnetic field, eddy currents are induced within it. These eddy currents flow in closed loops within the material and generate heat due to the material's ohmic resistance.

[0043] This effect is particularly pronounced in metals and conductive ceramics. Although piezoelectric materials are not heated by induction, they 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, and lead zirconate titanate (PZT, Pb[ZrₓTi₁ₓ]O₃) is one of the most widely used piezoelectric ceramics and also exhibits high piezoelectricity.

[0044] The application of piezoelectric materials is not limited to these examples. Alternating magnetic fields cause the magnetic or piezoelectric particles to vibrate, preferably within the dispersion, thereby generating mechanical energy. This energy facilitates the separation of water molecules from other adhesive molecules and promotes the displacement 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 sloshing and hardening of the adhesive.

[0046] Furthermore, water possesses diamagnetic properties, which exert a force on the water molecules, causing them to move away from a correspondingly generated magnetic field. Applying an external alternating magnetic field therefore creates a kind of pumping effect, depending on the strength of this 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 drawn into the packaging material more quickly and thus achieving faster setting.

[0047] In ferro- or ferrimagnetic materials, heat is generated by the constant reorientation of the magnetic dipoles of the water molecules in the adhesive when the adhesive is exposed to an alternating magnetic field, which also generates heat within the adhesive. This effect is particularly relevant for ferrimagnetic ceramics such as ferrites. The control of 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 material manufacturing machine according to the present invention is defined as a device capable of producing packaging, either partially or completely, from a predetermined packaging material. A key feature of this packaging material 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 area of ​​the 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 regard to various types and shapes of packaging and various packaging material manufacturing machines.

[0049] A packaging material manufacturing machine can be a machine that transports a large number of packaging material blanks through various processing stations using a conveyor module. In this process, each packaging blank is formed into a package, with at least one adhesive seam applied to the package, bonding the two layers of the blank together with adhesive. The conveying of the blanks is continuous, and the conveying speeds can be varied as needed. A specific application example for this type of packaging machine is folding carton gluing machines, which are used to form folding carton blanks and assemble them into complete packages.An exemplary packaging machine for processing individual blanks, such as a folding carton gluing machine, has in particular at least one sensor, such as a photoelectric 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 supplied 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 point 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 specifically connected to the control system of the packaging material manufacturing machine, which stores the desired pattern for adhesive application in relation to the packaging material's shape. The packaging material manufacturing machine's control system is also connected to another sensor, such as a rotary encoder, which is capable of detecting the conveying speed of the packaging material manufacturing machine's conveyor module. Based on the measured conveying speed, the control system can determine both the start and end times of the respective adhesive application by the adhesive module and / or the start and end times of the activation of the magnetic module, particularly the induction head.

[0052] A packaging material manufacturing machine according to the present invention is a machine in which a pre-made package is erected into a three-dimensional shape, filled with the product, and then, for example, an adhesive flap is attached to this joint according to the method. An example of such a packaging material manufacturing machine is a cartoning machine. There are also hybrid forms in which packaging material manufacturing and filling are combined, such as form-fill-and-seal packaging material manufacturing machines.

[0053] The control of the magnetic module, in particular 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 carried out together with the control of the adhesive module, in particular 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, whereby in this case the control of the packaging material manufacturing machine transmits a start and end signal to the magnetic module control to activate the magnetic module or provides a signal during the desired activity period of the magnetic module.

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

[0056] According to one embodiment, the application of the aqueous, non-heat-activated adhesive to the at least one adhesive seam of the first layer of the fiber-based paper or cardboard packaging material is carried out section by section by the adhesive module and / or the method comprises the further process 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 area of ​​the magnetic module.

[0057] This achieves the technical advantage that, according to the first variant, the adhesive is applied to the adhesive seam in a resource-saving manner. According to the second variant, the control system is designed to activate the alternating magnetic field only when an adhesive area is located within the effective range of this field, while in all other cases the control system deactivates the alternating magnetic field, thus preventing unnecessary activation of the magnetic module.

[0058] In particular, the control system 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 another sensor, for example a rotary encoder.

[0059] According to one embodiment, the conveying module is designed to move the first layer of the fiber-based paper or cardboard packaging material, which is connected to the second layer, under the magnetic module at variable conveying speeds, wherein the method further comprises the process step of adjusting the field strength and / or the frequency of the alternating magnetic field provided by the magnetic module by controlling the packaging material manufacturing machine depending on the conveying 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 control system is connected to an additional sensor, such as a rotary encoder, which is designed to provide the control system with the conveying speed of the packaging machine's conveyor module.

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

[0062] In this process, 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 that generates the excitation signal for the induction head. This magnetic head controller can either be implemented as an integral part of the induction head itself or be associated with it.

[0063] According to one embodiment, the packaging material manufacturing machine has a control system in which an adhesive pattern to be applied to the at least one adhesive seam by the adhesive module is stored, and wherein the method comprises the further process step of positioning the magnetic module at 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 achieves the technical advantage of direct control of the magnetic module based on the specific adhesive pattern to be applied to the packaging material, as stored in the control system. Thus, the magnetic module, or rather the induction head, is controlled in this case by a separate control system for the packaging manufacturing machine, which, in addition to the induction head, also controls at least one adhesive application valve of the adhesive module.

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

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

[0067] In one embodiment, the control system 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 adhesive bond at low conveying speeds of the packaging material. At lower conveying speeds, below the threshold speed, the contact area after joining the packaging material layers should ideally be sufficiently long to allow adequate curing of the adhesive layer. This ensures that the adhesive seam does not open prematurely due to the restoring forces of the packaging material or the weight of the contents.

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

[0070] Alternatively, activation can also occur only when an adhesive area, in particular an area where adhesive has been applied to at least one layer of packaging material, is within the effective range of the alternating magnetic field. The adhesive application pattern data can be used to control the magnetic coils for generating the alternating magnetic field, whereby 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 application can be carried out via a disc gluing unit.

[0071] This ensures precise and efficient application of the alternating magnetic field only when it is actually needed. Integrating the magnetic coils as part of the induction heads into packaging manufacturing 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 guiding elements and forming elements, such as forming shoulders, in the packaging material manufacturing machine to guide the packaging material; however, these elements are preferably not magnetizable. It is also advantageous if these elements are made of stainless steel, since most stainless steels are non-magnetic.

[0073] In areas with alternating magnetic fields, it is particularly possible to use plastics as an alternative to stainless steel for conductive elements and mold components such as mold shoulders. These plastics can be reinforced with glass beads or other abrasion-resistant materials in the areas where they come into contact with the abrasive packing material. The glass beads, for example, ensure that the material is not damaged by the abrasive packing 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 is activated to apply the alternating magnetic field after the two layers of the fiber-based paper and cardboard packaging material have been joined, meaning that the magnetic field passes 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 layers of packaging material to be in direct contact from the start. When the adhesive, located in the area of ​​at least one seam between the layers, is activated, the water is quickly drawn from the gap into the packaging material, and the adhesive sets. This ensures that the adhesive bond to the layers in the joining area is established from the outset when the alternating magnetic field is applied to the gap after the joining process. This significantly increases the efficiency and quality of the bonding process.

[0076] In one embodiment, the magnetic module has at least one temperature sensing device configured to detect the surface temperature of the fiber-based paper or cardboard packaging material in the area of ​​at least one adhesive seam, the method comprising the further process step of comparing the detected surface temperature of the fiber-based paper or cardboard packaging material with a reference value by means of a control system of the packaging 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 magnetic module by means of a control system of the packaging manufacturing machine depending on the determined comparison result.

[0077] This achieves the technical advantage that overheating of the adhesive in the adhesive seam is avoided by effectively adjusting the field strength and / or frequency of the alternating magnetic field to a temperature-dependent degree.

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

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

[0080] With a fixed mounting location for the induction head and temperature sensor, the time required for a section of the packaging material to travel from the induction head to the temperature sensor is very short. Due to the delayed heat conduction through the packaging material, less time is available for the corresponding heat input to spread across the surface of the material. Therefore, the temperature setpoint can be adjusted by the controller, particularly depending on whether the temperature is linear or non-linear. Other parameters, such as the thickness or thermal conductivity of the packaging material, can also be considered when determining the temperature setpoint.

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

[0083] According to a second aspect, the above-mentioned problem is solved by a fiber-based paper or cardboard packaging material, producible by a method according to the first aspect, wherein the fiber-based paper or cardboard packaging material is in particular designed as a folding box, a corrugated packaging, a wrapping packaging, a bag, a pouch or a sack.

[0084] According to a third aspect, the aforementioned problem is solved by a packaging manufacturing machine for joining two layers of a fiber-based paper or cardboard packaging material, comprising: a conveying module for conveying at least one layer of the fiber-based paper or cardboard packaging material; an adhesive module for applying aqueous, non-heat-activated 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 magnetic module for applying an alternating magnetic field, wherein the conveying module is configured to convey a first layer of the fiber-based paper or cardboard packaging material; wherein the adhesive module is configured to apply the aqueous, non-heat-activated 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 join 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 magnetic module is configured to apply an alternating magnetic field in the area 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.

[0085] This achieves the technical advantage of effective bonding of the first and second layers of the fiber-based paper or cardboard packaging material.

[0086] According to an advantageous embodiment, the packaging material manufacturing machine has a control system configured to activate the conveying module for conveying the first layer of the fiber-based paper or cardboard packaging material at a variable conveying speed, and wherein the packaging material manufacturing machine has a conveying speed detection device, in particular a rotary encoder, which is connected to the control system in terms of control technology.

[0087] This achieves the technical advantage that, by effectively adjusting the conveying speed, the residence time of the adhesive seam in the effective area of ​​the alternating magnetic field is advantageously optimized.

[0088] According to an advantageous embodiment, the packaging material manufacturing machine has a control system in which an adhesive pattern to be applied to the at least one adhesive seam by the adhesive module is stored, and wherein the control system is configured to position the magnetic module at 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.

[0089] This achieves the technical advantage that, through appropriate, advantageous positioning of the magnetic module, the energy provided by the alternating magnetic field and introduced into the adhesive can be effectively regulated.

[0090] The exemplary embodiments mentioned in relation to the method according to the first aspect are likewise exemplary embodiments for the product that can be manufactured by the method according to the second aspect, and in relation to the packaging manufacturing machine according to the third aspect, and vice versa.

[0091] Exemplary embodiments of the invention are shown in the drawings and are described in more detail below.

[0092] They show: Fig. 1 is a schematic representation of a packaging material manufacturing machine for bonding two layers of a fiber-based paper or cardboard packaging material according to an embodiment; Fig. 2 is a schematic representation of a packaging material manufacturing machine for bonding two layers of a fiber-based paper or cardboard packaging material according to a comparative example; Fig. 3 is 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-activated adhesive according to an embodiment; and Fig. 5 is a schematic representation of a method for bonding layers of a fiber-based paper or cardboard packaging material according to an embodiment.

[0093] The following detailed description refers to the accompanying drawings, which form part thereof and illustrate specific embodiments in which the invention can be implemented. It is understood that other embodiments can also be used and structural or logical modifications can be made without deviating from the concept of the present invention. Therefore, the following detailed description is not to be understood as limiting. Furthermore, it is understood that the features of the various embodiments described herein can be combined with one another, unless specifically stated otherwise.

[0094] The aspects and embodiments are described with reference to the drawings, where the same reference numerals generally refer to the same elements. For explanatory purposes, numerous specific details are set forth in the following description to provide a thorough understanding of one or more aspects of the invention.

[0095] Fig. 1 Figure 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 exemplary embodiment.

[0096] The packaging material manufacturing machine 100 is in the Fig. 1 It is shown only schematically and allows layers 101a and 101b of fiber-based paper or cardboard packaging material 101 to be joined together. Even if in the Fig. 1 Although only two layers 101a, 101b of the fiber-based paper or cardboard packaging material 101 are shown as examples, the packaging material manufacturing machine 100 is obviously designed to join more than two layers 101a, 101b of the fiber-based paper or cardboard packaging material 101 together.

[0097] In the Fig. 1 A conveying module 103, in particular a conveyor belt, of the packaging material manufacturing machine 100 is shown, which is designed to convey a first layer 101a of the fiber-based paper or cardboard packaging material 101 along a conveying direction 105.

[0098] The packaging material manufacturing machine 100 further comprises an adhesive module 107, which is configured to apply an aqueous, non-heat-activated adhesive 109 to the conveyed first layer 101a of the fiber-based paper or cardboard packaging material 101. In this process, the Fig. 1 schematically shown that the applied aqueous, non-heat-activated adhesive 109 comprises ferromagnetic, ferrimagnetic, superparamagnetic and / or piezoelectric particles 111.

[0099] As in the Fig. 1 The adhesive module 107, which is only shown schematically, applies the aqueous, non-heat-activated adhesive 109 to at least one adhesive seam 113 of the first layer 101a.

[0100] Furthermore, the packaging material manufacturing machine 100 features a Fig. 1 The only schematically indicated displacement module 115 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.

[0101] Even if that is in the Fig. 1 Not shown, the transfer module 115 can comprise a folding device, a forming device, or a joining device configured 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 create an effective bond 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. The conveying module 103 then transports the fiber-based paper or cardboard packaging material 101 into the area of ​​a magnetic module 117 of the packaging manufacturing machine 100. The magnetic 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 results in a physical bonding of 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 sheets 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 on top of the other and joined together in the area of ​​the adhesive seam 113 using these joining methods. 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 comprise either a single piece of packaging material 101, in which the layers 101a, 101b have been brought into alignment in the area of ​​the adhesive seam 113 by a folding process, or it can include the possibility of two separate packaging material webs or packaging material blanks arranged one on top of 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. Crucially, at least one layer 101a, 101b of the packaging material 101 must be 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 shown schematically as follows.

[0105] The first process 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 process step comprises the 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.

[0107] The third process step comprises joining 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. Optionally, the first and second layers 101a, 101b of the fiber-based paper or cardboard packaging material 101 are pressed together in the area of ​​the adhesive seam 113.

[0108] The fourth process 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 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.

[0109] In this process, 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, which is located between the two layers 101a, 101b of the fiber-based paper or cardboard packaging material 101.

[0110] Fig. 2 Figure 101 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 a comparative example.

[0111] The procedure according to Fig. 2 differs from the procedure in Fig. 1 by the fact that the work step 207, the application of the alternating magnetic field 119 to the aqueous adhesive 109, takes place before joining 205 of the second layer 101b of the fiber-based paper and cardboard material to 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 is in the Fig. 2 In the comparative example shown, the magnetic field 119 is applied to the unprotected aqueous adhesive 109, which has not yet been incorporated into the joining process. This deviation means that the adhesive 109 is already affected by the alternating magnetic field 119 before the actual joining of the packaging material layers 101a, 101b, which can potentially produce different properties and effects on the adhesive 109 in the area of ​​the adhesive seam 113.

[0113] This method, known from the prior art, has several disadvantages compared to the method of the present invention. In particular, there is a risk that the adhesive 109 will "over-dry" and lose its stickiness.

[0114] Fig. 3 shows a schematic representation of a fiber-based paper or cardboard packaging material before gluing according to an exemplary embodiment.

[0115] The in Figur 3 The depicted fiber-based paper or cardboard packaging material 101 is in the form of a folding carton blank. Here, a glued seam 113 of the fiber-based paper or cardboard packaging material 101 marks a specifically defined area of ​​the packaging material 101. This glued seam 113 enables the bonding of the two opposing layers 101a and 101b of the packaging material 101 to one another. It is important to note that this example is not limited to folding cartons but can also be applied to other forms of packaging.

[0116] Fig. 4 Figure 1 shows a schematic representation of a magnetic particle in an aqueous, non-heat-activated adhesive according to an exemplary embodiment.

[0117] In Fig. 4 A magnetic particle 111 of the "core" type is shown, consisting of a magnetic or magnetizable core 121. This core is surrounded by at least one shell 123 made of another material, which can, for example, be 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 can be cross-linked with a sticky component of the adhesive 109.

[0118] Fig. 5 Figure 1 shows a schematic representation of a method for joining layers of a fiber-based paper or cardboard packaging material according to an exemplary embodiment.

[0119] The process 200 comprises as a first process step the conveying 201 of a first layer 101a of the fiber-based paper or cardboard packaging material 101 through the conveying module 103.

[0120] The process 200 comprises, as a second process step, the 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.

[0121] The process 200 comprises, as a third process 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.

[0122] The process 200 comprises as a third process step the physical setting 207 of the aqueous adhesive layer between the first and second layer 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 layer 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 layer 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 manufacturing machine (100), wherein the packaging 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, 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 magnetic module (117) for applying a magnetic alternating 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 by the fact thatThe process (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); applying (203) 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) through the adhesive module (107); joining (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) through the transfer 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.

2. Method (200) according to claim 1, characterized by the fact thatthe application (203) of the aqueous, non-heat-activated adhesive (109), on which at least one adhesive seam (113) of the first layer (101a) of the fiber-based paper or cardboard packaging material (101) is applied section by section by the adhesive module (107) and / or wherein the method comprises the further process step of activating the magnetic module (117) by a control of the packaging material manufacturing machine (100) when the at least one adhesive seam (113) is located in the effective area of ​​the magnetic module (117).

3. Method (200) according to claim 1 or 2, characterized by the fact thatthe conveying module (103) is designed to move the first layer (101a) of the fiber-based paper or cardboard packaging material (101) connected with the second layer (101b) under the magnetic module (117) at variable conveying speeds, and wherein the method comprises the further process step of adjusting the field strength and / or the frequency of the alternating magnetic field (119) provided by the magnetic module (117) by a control of the packaging material manufacturing machine (100) depending on the conveying speed of the paper or cardboard packaging material (101).

4. Method (200) according to any of the preceding claims, characterized by the fact thatthe 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 process step of positioning the magnetic module (117) at 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 any of the preceding claims, characterized by the fact thatthe magnetic module (117) has at least one temperature sensing device configured to detect the surface temperature of the fiber-based paper or cardboard packaging material (101) in the area of ​​the at least one adhesive seam (113), the method comprising the further process steps of comparing the detected surface temperature of the fiber-based paper or cardboard packaging material (101) with a reference value by means of a control of the packaging material manufacturing machine (100) in order to determine a comparison result, and adjusting the field strength and / or the frequency of the alternating magnetic field (119) provided by the magnetic module (117) by means of a control of the packaging material manufacturing machine (100) depending on the determined comparison result.

6. Method (200) according to any of the preceding claims, characterized by the fact thatThe packaging manufacturing machine (100) has a control system in which the melting temperature of the polymeric components of the aqueous, non-heat-activated adhesive (109) is stored, wherein the application of the alternating magnetic field (119) is specified by the control system such that the temperature of the aqueous, non-heat-activated adhesive (109) does not exceed the melting temperature of the polymeric components of the aqueous, non-heat-activated adhesive (109).

7. Fiber-based paper or cardboard packaging material (101), producible by a method according to any one of claims 1 to 6, wherein the fiber-based paper or cardboard packaging material (101) is in particular designed as a folding box, a corrugated packaging, a wrapping packaging, a bag, a pouch or a sack.

8. Packaging 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 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, ferrimagnetic, superparamagnetic and / or piezoelectric particles (111); a repositioning module (115) for repositioning 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 conveying module (103) is configured to convey a first layer (101a) of the fiber-based paper or cardboard packaging material (101);wherein the adhesive module (107) is configured to apply 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); wherein the transfer module (115) is configured to join 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);and wherein the magnetic module (117) is configured 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 effect 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 effective bonding between the first and second layers (101a, 101b) of the fiber-based paper or cardboard packaging material (101).

9. Packaging material manufacturing machine (100) according to claim 8, characterized by the fact thatthe packaging material manufacturing machine (100) has a control system which is configured to activate the conveying module (103) for conveying the first layer (101a) of the fiber-based paper or cardboard packaging material (101) at a variable conveying speed, and wherein the packaging material manufacturing machine (100) has a conveying speed detection device, in particular a rotary encoder, which is connected to the control system.

10. Packaging material manufacturing machine (100) according to claim 9, characterized by the fact thatthe 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 configured to position the magnetic module (117) at 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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