EP3402662B1 - Method and device for folding corrugated cardboard - Google Patents

Method and device for folding corrugated cardboard Download PDF

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Publication number
EP3402662B1
EP3402662B1 EP16785398.5A EP16785398A EP3402662B1 EP 3402662 B1 EP3402662 B1 EP 3402662B1 EP 16785398 A EP16785398 A EP 16785398A EP 3402662 B1 EP3402662 B1 EP 3402662B1
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EP
European Patent Office
Prior art keywords
liquid mixture
corrugated
cardboard
corrugated cardboard
vol
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP16785398.5A
Other languages
German (de)
French (fr)
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EP3402662A1 (en
Inventor
Thomas Stober
Werner Wolf
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wilhelm Bahmueller Maschinenbau Praezisionswerkzeuge GmbH
Original Assignee
Wilhelm Bahmueller Maschinenbau Praezisionswerkzeuge GmbH
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Publication date
Priority claimed from DE102016100570.3A external-priority patent/DE102016100570A1/en
Priority claimed from DE102016114660.9A external-priority patent/DE102016114660A1/en
Application filed by Wilhelm Bahmueller Maschinenbau Praezisionswerkzeuge GmbH filed Critical Wilhelm Bahmueller Maschinenbau Praezisionswerkzeuge GmbH
Publication of EP3402662A1 publication Critical patent/EP3402662A1/en
Application granted granted Critical
Publication of EP3402662B1 publication Critical patent/EP3402662B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
    • B31B50/26—Folding sheets, blanks or webs
    • B31B50/585—Folding sheets, blanks or webs by air jets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
    • B31B50/25—Surface scoring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
    • B31B50/74—Auxiliary operations
    • B31B50/741—Moistening; Drying; Cooling; Heating; Sterilizing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F1/00—Mechanical deformation without removing material, e.g. in combination with laminating
    • B31F1/08—Creasing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F1/00—Mechanical deformation without removing material, e.g. in combination with laminating
    • B31F1/36—Moistening and heating webs to facilitate mechanical deformation and drying deformed webs

Definitions

  • the invention relates to a method for folding blanks from corrugated or solid cardboard for the production of folding boxes.
  • the invention further relates to an apparatus for performing the method.
  • blanks In the manufacture of solid or corrugated cardboard boxes, blanks are used which are provided with creasing lines, cracks or perforations, along which the blanks can be folded or folded in order to thereby e.g. to produce folding boxes designed with a bottom surface, an outer surface and a top surface.
  • Corrugated cardboards comprise, for example, two flat paper webs, between which there is a corrugated paper web.
  • a corrugated cardboard is also referred to as single-layer or single-corrugated cardboard
  • a double-layer or double-corrugated cardboard comprising two flat paper webs arranged on the outside, one flat paper web arranged on the inside and two corrugated paper webs, each of which is arranged between the inner flat paper web and one of the two on the outside flat paper webs are arranged.
  • three-layer or three-corrugated corrugated cardboard and other multi-corrugated corrugated cardboard are known, with corrugated cardboard further differentiating between different corrugation types and combinations of these corrugation types according to the corrugation heights and the corrugations.
  • the corrugated cardboard is arranged in such a way that in the outer surfaces of the folding boxes the waves run from the bottom surface to the top surface or the channels formed by the corrugations run from the bottom surface to the top surface of the folding box ,
  • creasing lines, cracks or perforations which are aligned parallel to the course of the waves must be introduced into the jacket surface, along which the jacket surface between the individual side surfaces the folding box can be folded or folded.
  • the creasing lines, cracks or perforations can be arranged along a wave trough, along a wave crest or along the flank between a wave trough or a wave crest, with folding not being exact due to the stiffness of the material along the line or creasing line, scoring or perforation required for this. Rather, deviations from a predetermined folding line can occur, which can subsequently result in the two mutually associated end regions of the lateral surface not being connected at the location provided for this purpose.
  • the problem that the folding does not take place exactly along a given line is also referred to in specialist circles as fishtailing and gap fluctuation.
  • the problem of fish tailing and gap fluctuation can be more pronounced with double-wall or three-wall corrugated cardboard and with a fluctuating quality of the materials used for the production of the corrugated cardboard, which can lead to problems with compliance with dimensional tolerances and with the automatic filling of the folding boxes.
  • a machine for folding folding box blanks which has various means for locally moistening the folding box blank.
  • a brush is used to moisten the underside, the lower end of which is in a reservoir filled with a liquid.
  • a nozzle is used to moisten the top. The liquid emerging from the nozzle falls onto a baffle plate and drips from there onto the folding box blank.
  • a liquid mixture which is suitable for making corrugated cardboard supple before folding. It contains 10 to 30 percent by weight of a surfactant.
  • the invention is therefore based on the object of providing a method and a device for folding blanks from corrugated or solid cardboard for the production of folding boxes, which avoid the disadvantages mentioned. This object is achieved by a method with the features of claim 1.
  • the application of such a liquid mixture is particularly advantageous since, due to the addition of the surfactant, the surface tension of the liquid mixture can be reduced in such a way that the liquid mixture can penetrate more quickly into pores and thus into the fibers of the solid or corrugated cardboard blank.
  • the compressed gas is advantageously introduced into the two-component nozzle at a pressure in the range from approximately 0.5 bar to approximately 100 bar, preferably in the range from approximately 0.5 bar to approximately 16 bar initiated, the liquid mixture being metered in without pressure.
  • Drops with a diameter in the range from approximately 15 to approximately 25 ⁇ m, preferably with a diameter of approximately 20 ⁇ m, are advantageously produced.
  • the small drops of the drop jet generated in this way can be accelerated due to the pressurized compressed gas by means of the two-substance nozzle in such a way that the drops hit a surface of the solid or corrugated cardboard with a comparatively high kinetic energy, so that the drops are drawn into the porous solid - or corrugated cardboard can also be accelerated.
  • the creasing line is introduced by locally compressing the solid cardboard or different layers of the corrugated cardboard between a rotatably mounted sonotrode and a rotatably mounted anvil or a second sonotrode and exciting the compressed area of the solid cardboard or corrugated cardboard with ultrasound.
  • a rotatably mounted sonotrode and a rotatably mounted anvil or a second sonotrode and exciting the compressed area of the solid cardboard or corrugated cardboard with ultrasound.
  • the liquid mixture is advantageously applied to an upper side of the blank made of corrugated or solid cardboard and / or an underside of the blank made of corrugated or solid cardboard. Applying the liquid mixture to the top and bottom has proven to be particularly advantageous, with blanks coated on one side being able to apply the liquid mixture only to the top or only to the bottom.
  • the liquid mixture has a compressed gas pressure in the range from approximately 2.5 bar to approximately 7 bar, preferably with a pressure gas pressure of about 5 bar is atomized. Drops that are too large only penetrate a fraction into the capillary of the corrugated cardboard. If the drops are too large, they burst on the surface of the corrugated cardboard and are partially thrown back. Furthermore, the kinetic energy of the drops can be influenced with a sufficient pressure gas pressure of this magnitude in such a way that the drops of the liquid mixture quickly penetrate into the surface of the corrugated cardboard.
  • the liquid mixture is applied, in particular sprayed, orthogonally to a direction of transport of the corrugated cardboard in a width of approximately 3 mm onto an upper side and / or a lower side of the corrugated cardboard.
  • the liquid mixture is advantageously applied, in particular sprayed, to an upper side and / or a lower side of the corrugated cardboard at an angle of approximately 45 ° to a plane arranged parallel to a direction of transport of the corrugated cardboard.
  • An orthogonal impact of the drops of the liquid mixture can thus be avoided. It has been shown that an orthogonal impact of the liquid mixture on the corrugated cardboard can, on the one hand, cause the drops to burst on the surface of the corrugated cardboard and, on the other hand, can lead to a circular spread of the burst drops, thereby also causing the edge zone of the crack, perforation or crease line can be softened and thus also the above-mentioned folding accuracy problems can arise.
  • the application, in particular the spraying, of the liquid mixture is carried out in a clocked manner.
  • the spraying process is briefly interrupted, so that Liquid mixture is only applied in the area of the crack, perforation or crease line.
  • the cycle is carried out pneumatically, for example by interrupting the compressed gas supply to the two-component nozzle.
  • the clocking it is possible for the clocking to take place electrically, for example an nozzle which can be driven by an electric motor and which is designed to close the nozzle outlet of the two-component nozzle can be provided.
  • the device comprises a device for introducing a crevice, perforation or crease line into a solid or corrugated cardboard and at least one two-substance nozzle which is designed and arranged in such a way that a liquid mixture comprising at least 96% by volume of water and a maximum of 4% by volume of a surfactant , preferably comprising at least 98% by volume of water and a maximum of 2% by volume of a surfactant can be applied to the crevice, perforation or crease line previously introduced into the blank by atomization by means of a compressed gas or is designed and arranged in such a way that it comprises a liquid mixture at least 96% by volume of water and a maximum of 4% by volume of a surfactant, preferably comprising at least 98% by volume of water and a maximum of 2% by volume of a surfactant, before introducing a crack, perforation or crease line onto the cut from corrugated or Solid cardboard can be applied by atomization using a compressed gas.
  • the device for introducing the score, perforation or crease line comprises a rotatably mounted sonotrode and a rotatably mounted anvil or a second sonotrode.
  • the device for introducing the scoring, perforation or scoring line comprises a mechanical scoring body which is designed to produce a scoring line without the use of ultrasound.
  • the two-substance nozzle has a first nozzle inlet for the liquid mixture and a second nozzle inlet for a compressed gas, and that the two-substance nozzle has a nozzle outlet for the atomized liquid.
  • At least one two-substance nozzle is provided, which is arranged in such a way that the liquid mixture can be applied to an upper side of the blank made of corrugated or solid cardboard and / or if at least one two-substance nozzle is provided, which is arranged in such a way that the Liquid mixture can be applied to an underside of the blank made of corrugated or solid cardboard.
  • a compressed air source is advantageously provided, which is designed to provide a compressed gas pressure in the range from approximately 2.5 bar to approximately 7 bar. It is particularly preferred if the compressed air source is designed to provide a compressed gas pressure of approximately 5 bar.
  • Such a pressure gas pressure has proven to be advantageous in order to be able to achieve a drop size of the liquid mixture which is particularly advantageous for a rapid penetration of the liquid mixture into the surface of the corrugated cardboard and to influence the kinetic energy of the drops in such a way that the drops of the liquid mixture quickly into the surface of corrugated cardboard.
  • a further advantageous embodiment of the device provides that the device has a device for arranging the corrugated cardboard in a spraying position, the nozzle outlet of the two-substance nozzle being arranged such that it is at a distance from an upper side and / or at a point when the corrugated cardboard is in the spraying position Bottom of the corrugated cardboard is arranged from about 3 to 8 mm.
  • a distance from the nozzle outlet of the two-substance nozzle to an upper side and / or lower side of the corrugated cardboard has proven to be advantageous in order to avoid too large a width of the droplet jet reaching the corrugated cardboard and thus to soften the corrugated cardboard in the edge regions of a crack, perforation or crease line to be produced avoid.
  • the device for arranging the corrugated cardboard in a spraying position can be designed, for example, as a plate-shaped support or as transport rollers.
  • the nozzle outlet is advantageously arranged at an angle of approximately 45 ° to a plane arranged parallel to a direction of transport of the corrugated cardboard.
  • Figure 1 shows a blank of a single-wall corrugated cardboard 12, into which a plurality of creasing lines 14 have already been introduced in a preceding process step by means of the device 10.
  • the cutting of the single-wall corrugated cardboard 12 comprises an upper flat paper web 16, a lower flat paper web 18 and one corrugated paper web 20, which is arranged between the two flat paper webs 16, 18.
  • the device 10 has a device (not shown in the figures) for introducing the creasing lines 14, which comprises a rotatably mounted sonotrode and a rotatably mounted anvil or a second rotatably mounted sonotrode, so that the creasing line 14 can be introduced into the corrugated cardboard 12 with ultrasound support ,
  • the creasing lines it is also conceivable for the creasing lines to be introduced into the corrugated cardboard 12 with a mechanical creasing body without the use of ultrasound.
  • the device 10 has spray nozzles designed as two-substance nozzles 22, to which a compressed gas, in particular compressed air with a pressure in the range from approximately 0.5 bar to approximately 16 bar and a liquid mixture is fed via lines 24 and through which the liquid mixture is applied to the creasing lines 14 becomes.
  • the liquid mixture comprises at least 96% by volume of water and a maximum of 4% by volume of a surfactant, preferably at least 98% by volume of water and a maximum of 2% by volume of a surfactant.
  • Two two-substance nozzles 22 are arranged such that the liquid mixture can be applied to an upper side 25 of the corrugated cardboard 12, two two-substance nozzles 22 being arranged such that the liquid mixture can be applied to an underside 27 of the corrugated cardboard. Applying the liquid mixture to the upper and lower sides 25, 27 has proven to be particularly advantageous, it being possible to provide the liquid mixture only on the upper side 25 or only on the lower side 27 in the case of blanks coated on one side with sensitive paints.
  • a two-component nozzle 22 of the device 10 is shown in FIG Figure 2 shown in section.
  • the two-substance nozzle 22 has a spindle 24 with a first nozzle inlet 26 for the liquid mixture and a second nozzle inlet 28 for the pressurized gas, the liquid mixture being introduced into the two-substance nozzle 22 in the direction of arrow 30 and the pressurized gas in the direction of arrow 32 in FIG Two-component nozzle 22 is introduced.
  • the two-substance nozzle 22 has a nozzle outlet 34, from which a drop jet 36 emerges during operation of the device 10 or the two-substance nozzle 22, the drops of which have a diameter in the range from approximately 15 to approximately 25 ⁇ m, preferably with a diameter of approximately 20 ⁇ m.
  • a water mixture with a comparatively low surface tension can be provided due to the use of the surfactant.
  • the drops in the drop jet 36 can be applied to a blank of corrugated cardboard 12 with a comparatively high kinetic energy due to the use of the two-component nozzle 22 by the pressurized compressed gas, so that the comparatively small drops quickly penetrate into the porous surface of the blank made of corrugated cardboard 12 can and penetrate into the fibers of the blank of corrugated cardboard 12 and can soften the fibers.
  • a compressed air source 38 (cf. Figure 1 ) provided to provide a compressed gas pressure in the range of about 2.5 bar to about 7 bar, preferably from is designed around 5 bar.
  • a pressure gas pressure has proven to be advantageous in order to be able to achieve a drop size of the liquid mixture which is particularly advantageous for a rapid penetration of the liquid mixture into the surface of the corrugated cardboard 12 and to influence the kinetic energy of the drops in such a way that the drops of the liquid mixture quickly get into the Penetrate the surface of the corrugated cardboard.
  • FIGs 5 to 7 show an atomization process when using the two-substance nozzle according to Figure 2 with different pressurized gas pressures.
  • Figure 5 if only a compressed gas pressure of about 0.5 bar is used, this leads to extremely large droplets 40
  • a compressed gas pressure of about 5 bar is used for an optimal atomization result
  • Figure 7 drop 40 can be achieved, which can penetrate quickly into the surface of the corrugated cardboard 12 on the one hand due to the small drop size and on the other hand due to the high kinetic energy.
  • the device 10 also has a device for arranging the corrugated cardboard in a spraying position (without reference number), the nozzle outlet 34 of the two-substance nozzle 22 being arranged such that it is at a distance 42 from an upper side 25 and / when the corrugated cardboard 12 is in the spraying position. or an underside 27 of the corrugated cardboard 12 of approximately 3 to 8 mm is arranged. This distance is in Figure 3 can clearly be seen which according to an enlarged section of the device 10 Figure 1 shows.
  • Such a distance 42 of the nozzle outlet 34 of the two-substance nozzle 22 to the top 25 and / or bottom 27 of the corrugated cardboard 12 has proven to be advantageous in order to to avoid excessive width of the droplet jet 36 reaching the corrugated cardboard and thus to avoid softening of the corrugated cardboard in edge regions of a crack, perforation or crease line 14 to be produced.
  • the device for arranging the corrugated cardboard 12 in a spraying position can be designed, for example, as a plate-shaped support or as transport rollers.
  • Figure 4 shows a further section of the device 10 according to Figure 1 looking in the direction of the Figures 1 and 3 shown arrow 44.
  • the direction of transport of the corrugated cardboard 12 by the device 10 is indicated by the arrow 46.
  • the Figures 1 and 3 thus show the device 10 orthogonal to the transport direction shown by the arrow 46.
  • the nozzle outlet 34 or a central longitudinal axis 48 of the two-substance nozzle 22 is arranged at an angle 50 of approximately 45 ° to a plane 52 arranged parallel to a transport direction of the corrugated cardboard 12 or to the top side 25 of the corrugated cardboard 12.
  • the liquid mixture becomes orthogonal to the direction of transport of the corrugated cardboard 12 indicated by the arrow 46 in a width 54 (cf. Figure 3 ) of about 3 mm applied to the top 25 and / or bottom 27 of the corrugated cardboard 12, in particular sprayed on.
  • the blank made of corrugated cardboard 12 becomes so supple in the area of the crease lines 14, that a subsequent folding process along the creasing lines 14 takes place exactly along the predetermined creasing line 14, regardless of the area in which the waves are folded, as a result of which the blanks of corrugated cardboard 12 are folded exactly in the required manner and thus the fishtailing described at the beginning Effect is avoided.

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  • Mechanical Engineering (AREA)
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Description

Die Erfindung betrifft ein Verfahren zur Faltung von Zuschnitten aus Well- oder Vollpappe für die Herstellung von Faltschachteln. Die Erfindung betrifft ferner eine Vorrichtung zur Durchführung des Verfahrens.The invention relates to a method for folding blanks from corrugated or solid cardboard for the production of folding boxes. The invention further relates to an apparatus for performing the method.

Bei der Herstellung von aus Voll- oder Wellpappe bestehenden Faltschachteln werden Zuschnitte verwendet, welche mit Rilllinien, Ritzen oder Perforationen versehen sind, längs welcher die Zuschnitte gefaltet bzw. geknickt werden können, um hierdurch z.B. mit einer Bodenfläche, einer Mantelfläche und einer Deckfläche ausgebildete Faltschachteln herzustellen.In the manufacture of solid or corrugated cardboard boxes, blanks are used which are provided with creasing lines, cracks or perforations, along which the blanks can be folded or folded in order to thereby e.g. to produce folding boxes designed with a bottom surface, an outer surface and a top surface.

Wellpappen umfassen beispielsweise zwei ebene Papierbahnen, zwischen welchen sich eine gewellte Papierbahn befindet. Eine derartige Wellpappe wird auch als einschichtige bzw. einwellige Wellpappe bezeichnet, wobei eine zweischichtige bzw. zweiwellige Wellpappe zwei außen angeordnete ebene Papierbahnen, eine innen angeordnete ebene Papierbahn und zwei gewellten Papierbahnen umfasst, welche jeweils zwischen der inneren ebenen Papierbahn und einer der beiden außen angeordneten ebenen Papierbahnen angeordnet sind. Darüber hinaus sind auch dreischichtige bzw. dreiwellige Wellpappen und andere mehrwellige Wellpappen bekannt, wobei ferner bei Wellpappen zwischen verschiedenen Wellenarten und Kombinationen dieser Wellenarten entsprechend der Wellenhöhen und der Wellenteilungen unterschieden wird. So wird bspw. zwischen einer Grobwelle, einer Mittelwelle, einer Feinwelle und einer Mikrowelle unterschieden.
Um bei aus Wellpappe hergestellten Faltschachteln die erforderliche Stapelfestigkeit der Faltschachteln zu erzielen, wird die Wellpappe derart angeordnet, dass in den Mantelflächen der Faltschachteln die Wellen von der Bodenfläche zur Deckfläche verlaufen bzw. die durch die Wellen gebildeten Kanäle von der Bodenfläche zur Deckfläche der Faltschachtel verlaufen.
Um die Mantelfläche mit den erforderlichen Faltungen bzw. Knickungen zu versehen und die einander zugeordneten Teile der Mantelfläche miteinander verbinden zu können, müssen in die Mantelfläche parallel zum Verlauf der Wellen ausgerichtete Rilllinien, Ritzen oder Perforationen eingebracht werden, längs welcher die Mantelfläche zwischen den einzelnen Seitenflächen der Faltschachtel gefaltet bzw. geknickt werden kann. Dabei kann jedoch das Problem auftreten, dass die Rilllinien, Ritzen oder Perforationen längs eines Wellentales, längs eines Wellenberges oder längs der Flanke zwischen einem Wellental oder einem Wellenberg angeordnet sein können, wobei eine Faltung aufgrund der Steifigkeit des Materials dann nicht exakt entlang der hierfür erforderlichen Linie bzw. Rilllinie, Ritze oder Perforation erfolgt. Vielmehr können dabei Abweichungen von einer vorgegebenen Faltungslinie auftreten, welche in der Folge dazu führen können, dass eine Verbindung der beiden einander zugeordneten Endbereiche der Mantelfläche nicht an der dafür vorgesehenen Stelle erfolgt.Corrugated cardboards comprise, for example, two flat paper webs, between which there is a corrugated paper web. Such a corrugated cardboard is also referred to as single-layer or single-corrugated cardboard, a double-layer or double-corrugated cardboard comprising two flat paper webs arranged on the outside, one flat paper web arranged on the inside and two corrugated paper webs, each of which is arranged between the inner flat paper web and one of the two on the outside flat paper webs are arranged. In addition, three-layer or three-corrugated corrugated cardboard and other multi-corrugated corrugated cardboard are known, with corrugated cardboard further differentiating between different corrugation types and combinations of these corrugation types according to the corrugation heights and the corrugations. For example, a distinction is made between a coarse wave, a medium wave, a fine wave and a microwave.
In order to achieve the required stack strength of the folding boxes in the case of folding boxes made of corrugated cardboard, the corrugated cardboard is arranged in such a way that in the outer surfaces of the folding boxes the waves run from the bottom surface to the top surface or the channels formed by the corrugations run from the bottom surface to the top surface of the folding box ,
In order to provide the jacket surface with the necessary folds or kinks and to be able to connect the parts of the jacket surface which are assigned to one another, creasing lines, cracks or perforations which are aligned parallel to the course of the waves must be introduced into the jacket surface, along which the jacket surface between the individual side surfaces the folding box can be folded or folded. The problem may arise, however, that the creasing lines, cracks or perforations can be arranged along a wave trough, along a wave crest or along the flank between a wave trough or a wave crest, with folding not being exact due to the stiffness of the material along the line or creasing line, scoring or perforation required for this. Rather, deviations from a predetermined folding line can occur, which can subsequently result in the two mutually associated end regions of the lateral surface not being connected at the location provided for this purpose.

Das Problem, dass die Faltung nicht exakt längs einer vorgegebenen Linie erfolgt, wird in Fachkreisen auch als Fishtailing und Gapschwankung bezeichnet. Das Problem des Fishtailings und der Gapschwankung kann bei zweiwelligen bzw. dreiwelligen Wellpappen und bei einer schwankenden Qualität der für die Herstellung der Wellpappe verwendeten Materialien verstärkt auftreten, wobei dies zu Problemen bei der Einhaltung von Maßtoleranzen und bei der automatischen Befüllung der Faltschachteln führen kann.The problem that the folding does not take place exactly along a given line is also referred to in specialist circles as fishtailing and gap fluctuation. The problem of fish tailing and gap fluctuation can be more pronounced with double-wall or three-wall corrugated cardboard and with a fluctuating quality of the materials used for the production of the corrugated cardboard, which can lead to problems with compliance with dimensional tolerances and with the automatic filling of the folding boxes.

Aus der US 3 270 628 ist eine Maschine zum Falten von Faltschachtelzuschnitten bekannt, die verschiedene Mittel zum lokalen Befeuchten des Faltschachtelzuschnitts aufweist. Zum Befeuchten der Unterseite wird ein Pinsel eingesetzt, dessen unteres Ende in einem mit einer Flüssigkeit gefüllten Reservoir steckt. Zum Befeuchten der Oberseite wird eine Düse eingesetzt. Die aus der Düse austretende Flüssigkeit fällt auf ein Prallblech und tropft von dort auf den Faltschachtelzuschnitt.From the US 3,270,628 a machine for folding folding box blanks is known which has various means for locally moistening the folding box blank. A brush is used to moisten the underside, the lower end of which is in a reservoir filled with a liquid. A nozzle is used to moisten the top. The liquid emerging from the nozzle falls onto a baffle plate and drips from there onto the folding box blank.

Aus der EP 2 614 955 A1 sind ein Verfahren und eine Vorrichtung zum Falten von Wellpappe bekannt bei der die Wellpappe im Bereich der Rillinien vor dem Falten mit einer durch eine Düse aufgebrachten Flüssigkeit schmiegsam gemacht wird.From the EP 2 614 955 A1 a method and a device for folding corrugated cardboard are known in which the corrugated cardboard is made pliable in the region of the crease lines before being folded with a liquid applied through a nozzle.

Aus der DE 579710 ist eine Vorrichtung zum Falten von Kartonagen bekannt, bei der Teile der zu faltenden Kartonagen durch einen Tupfer befeuchtet werden.From the DE 579710 a device for folding cardboard boxes is known in which parts of the cardboard boxes to be folded are moistened by a swab.

Aus der JP 2010 260181 A ist ein Flüssigkeitsgemisch bekannt, welches dazu geeignet ist, Wellpappe vor dem Falten geschmeidig zu machen. Es enthält 10 bis 30 Gewichtsprozent eines Tensids.
Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung zur Faltung von Zuschnitten aus Well- oder Vollpappe für die Herstellung von Faltschachteln bereitzustellen, welche die genannten Nachteile vermeiden.
Diese Aufgabe wird durch ein Verfahren mit den Merkmalen des Anspruchs 1 gelöst.
Das Aufbringen eines derartigen Flüssigkeitsgemischs ist besonders vorteilhaft, da aufgrund der Zugabe des Tensids die Oberflächenspannung des Flüssigkeitsgemischs derart verringert werden kann, dass das Flüssigkeitsgemisch schneller in Poren und damit in die Fasern des Zuschnitts aus Voll- oder Wellpappe eindringen kann. Somit kann ein Aufquellen und Erweichen der Fasern im Bereich der Ritze, Perforation oder Rilllinie beschleunigt werden.
Durch die Verwendung der Zweistoffdüse aufgrund der dann geringen Oberflächenspannung wird eine besonders feine Zerstäubung des Flüssigkeitsgemischs erreicht, so dass das Flüssigkeitsgemisch aufgrund der Porosität der Voll- oder Wellpappe vergleichsweise schnell in die Voll- oder Wellpappe einziehen kann und dort in die Fasern der Voll- oder Wellpappe eindringen und diese erweichen kann.From the JP 2010 260181 A a liquid mixture is known which is suitable for making corrugated cardboard supple before folding. It contains 10 to 30 percent by weight of a surfactant.
The invention is therefore based on the object of providing a method and a device for folding blanks from corrugated or solid cardboard for the production of folding boxes, which avoid the disadvantages mentioned.
This object is achieved by a method with the features of claim 1.
The application of such a liquid mixture is particularly advantageous since, due to the addition of the surfactant, the surface tension of the liquid mixture can be reduced in such a way that the liquid mixture can penetrate more quickly into pores and thus into the fibers of the solid or corrugated cardboard blank. Swelling and softening of the fibers in the area of the crevice, perforation or crease line can thus be accelerated.
Through the use of the two-substance nozzle due to the then low surface tension, a particularly fine atomization of the liquid mixture is achieved, so that the liquid mixture can comparatively quickly pull into the solid or corrugated cardboard due to the porosity of the solid or corrugated cardboard and there into the fibers of the solid or Corrugated cardboard can penetrate and soften it.

Besonders bevorzugt ist es dabei, wenn als Druckgas Umgebungsluft verwendet wird.
Das Druckgas wird dabei vorteilhafterweise mit einem Druck im Bereich von etwa 0,5 bar bis etwa 100 bar, vorzugsweise im Bereich von etwa 0,5 bar bis etwa 16 bar in die Zweistoffdüse eingeleitet, wobei das Flüssigkeitsgemisch drucklos zudosiert wird.It is particularly preferred if ambient air is used as the compressed gas.
The compressed gas is advantageously introduced into the two-component nozzle at a pressure in the range from approximately 0.5 bar to approximately 100 bar, preferably in the range from approximately 0.5 bar to approximately 16 bar initiated, the liquid mixture being metered in without pressure.

Besonders vorteilhaft ist es dabei, wenn beim Aufbringen des Flüssigkeitsgemischs ein Tropfen aufweisender Tropfenstrahl erzeugt wird.It is particularly advantageous if a drop jet with drops is generated when the liquid mixture is applied.

Vorteilhafterweise werden dabei Tropfen mit einem Durchmesser im Bereich von etwa 15 bis etwa 25 µm, vorzugsweise mit einem Durchmesser von etwa 20 µm erzeugt.
Die dabei erzeugten kleinen Tropfen des Tropfenstrahls können aufgrund des unter Druck stehenden Druckgases mittels der Zweistoffdüse derart beschleunigt werden, dass die Tropfen auf eine Oberfläche der Voll- oder Wellpappe mit einer vergleichsweise hohen kinetischen Energie auftreffen, so dass ein Einziehen der Tropfen in die poröse Voll- oder Wellpappe zusätzlich beschleunigt werden kann.Drops with a diameter in the range from approximately 15 to approximately 25 μm, preferably with a diameter of approximately 20 μm, are advantageously produced.
The small drops of the drop jet generated in this way can be accelerated due to the pressurized compressed gas by means of the two-substance nozzle in such a way that the drops hit a surface of the solid or corrugated cardboard with a comparatively high kinetic energy, so that the drops are drawn into the porous solid - or corrugated cardboard can also be accelerated.

Weiterhin ist es vorteilhaft, wenn das Einbringen der Rilllinie durch lokales Zusammendrücken der Vollpappe oder verschiedener Lagen der Wellpappe zwischen einer drehbar gelagerten Sonotrode und einem drehbar gelagerten Amboss bzw. einer zweiten Sonotrode und Anregen des zusammengedrückten Bereichs der Vollpappe oder Wellpappe mit Ultraschall erfolgt. Es ist jedoch auch denkbar, dieIt is also advantageous if the creasing line is introduced by locally compressing the solid cardboard or different layers of the corrugated cardboard between a rotatably mounted sonotrode and a rotatably mounted anvil or a second sonotrode and exciting the compressed area of the solid cardboard or corrugated cardboard with ultrasound. However, it is also conceivable that

Rilllinie rein mechanisch ohne die Verwendung von Ultraschall mittels eines Rillkörpers in die Wellpappe einzubringen.Creasing line purely mechanically without using ultrasound to introduce a corrugated cardboard into the corrugated cardboard.

Vorteilhafterweise wird das Flüssigkeitsgemisch auf eine Oberseite des Zuschnitts aus Well- oder Vollpappe und/oder eine Unterseite des Zuschnitts aus Well- oder Vollpappe aufgebracht. Ein Aufbringen des Flüssigkeitsgemischs auf die Ober- und Unterseite hat sich dabei als besonders vorteilhaft erwiesen, wobei bei einseitig beschichteten Zuschnitten vorgesehen sein kann, das Flüssigkeitsgemisch nur auf die Oberseite oder nur auf die Unterseite aufzubringen.The liquid mixture is advantageously applied to an upper side of the blank made of corrugated or solid cardboard and / or an underside of the blank made of corrugated or solid cardboard. Applying the liquid mixture to the top and bottom has proven to be particularly advantageous, with blanks coated on one side being able to apply the liquid mixture only to the top or only to the bottom.

Um eine für ein schnelles Eindringen des Flüssigkeitsgemischs in die Oberfläche der Wellpappe besonders vorteilhafte Tropfengröße des Flüssigkeitsgemischs erreichen zu können, hat es sich als vorteilhaft erwiesen, wenn das Flüssigkeitsgemisch mit einem Druckgasdruck im Bereich von etwa 2,5 bar bis etwa 7 bar, vorzugsweise mit einem Druckgasdruck von etwa 5 bar zerstäubt wird. Zu große Tropfen dringen nur zu einem Bruchteil in die Kapillare der Wellpappe ein. Bei zu großen Tropfen zerplatzen diese an der Oberfläche der Wellpappe und werden zum Teil wieder zurückgeworfen. Ferner kann mit einem ausreichenden Druckgasdruck in dieser Größenordnung die kinetische Energie der Tropfen derart beeinflusst werden, dass die Tropfen des Flüssigkeitsgemischs schnell in die Oberfläche der Wellpappe eindringen.In order to be able to achieve a drop size of the liquid mixture which is particularly advantageous for rapid penetration of the liquid mixture into the surface of the corrugated cardboard, it has proven to be advantageous if the liquid mixture has a compressed gas pressure in the range from approximately 2.5 bar to approximately 7 bar, preferably with a pressure gas pressure of about 5 bar is atomized. Drops that are too large only penetrate a fraction into the capillary of the corrugated cardboard. If the drops are too large, they burst on the surface of the corrugated cardboard and are partially thrown back. Furthermore, the kinetic energy of the drops can be influenced with a sufficient pressure gas pressure of this magnitude in such a way that the drops of the liquid mixture quickly penetrate into the surface of the corrugated cardboard.

Um eine zu große Breite des die Wellpappe erreichenden Tropfenstrahls zu vermeiden, hat es sich ferner als vorteilhaft erwiesen, wenn das Aufbringen des Flüssigkeitsgemischs durch einen Düsenauslass der Zweistoffdüse erfolgt, der in einem Abstand von einer Oberseite und/oder einer Unterseite der Wellpappe von etwa 3 mm bis 8 mm angeordnet ist.In order to avoid too large a width of the drop jet reaching the corrugated cardboard, it has also proven to be advantageous if the application of the liquid mixture through a nozzle outlet Two-substance nozzle takes place, which is arranged at a distance from an upper side and / or a lower side of the corrugated cardboard of approximately 3 mm to 8 mm.

Besonders bevorzugt ist es dabei, wenn das Flüssigkeitsgemisch orthogonal zu einer Transportrichtung der Wellpappe in einer Breite von etwa 3 mm auf eine Oberseite und/oder eine Unterseite der Wellpappe aufgebracht, insbesondere aufgesprüht wird. Somit kann ein Erweichen der Wellpappe in einer Randzone der Ritze, Perforation oder Rilllinie vermieden werden, wobei durch ein Erweichen der Randzone hervorgerufene Faltgenauigkeitsprobleme vermieden werden können.It is particularly preferred if the liquid mixture is applied, in particular sprayed, orthogonally to a direction of transport of the corrugated cardboard in a width of approximately 3 mm onto an upper side and / or a lower side of the corrugated cardboard. Thus, a softening of the corrugated cardboard in an edge zone of the scoring, perforation or crease line can be avoided, whereby folding accuracy problems caused by softening the edge zone can be avoided.

Vorteilhafterweise wird das Flüssigkeitsgemisch in einem Winkel von etwa 45° zu einer parallel zu einer Transportrichtung der Wellpappe angeordneten Ebene auf eine Oberseite und/oder eine Unterseite der Wellpappe aufgebracht, insbesondere aufgesprüht. Somit kann ein orthogonales Auftreffen der Tropfen des Flüssigkeitsgemischs vermieden werden. Es hat sich gezeigt, dass ein orthogonales Auftreffen des Flüssigkeitsgemischs auf die Wellpappe einerseits zu einem Zerplatzen der Tropfen an der Oberfläche der Wellpappe führen kann und andererseits zu einer kreisförmigen Ausbreitung der zerplatzten Tropfen führen kann, wobei dadurch ebenfalls die Randzone der Ritze, Perforation oder Rilllinie erweicht werden kann und somit ebenfalls die oben genannten Faltgenauigkeitsprobleme entstehen können.The liquid mixture is advantageously applied, in particular sprayed, to an upper side and / or a lower side of the corrugated cardboard at an angle of approximately 45 ° to a plane arranged parallel to a direction of transport of the corrugated cardboard. An orthogonal impact of the drops of the liquid mixture can thus be avoided. It has been shown that an orthogonal impact of the liquid mixture on the corrugated cardboard can, on the one hand, cause the drops to burst on the surface of the corrugated cardboard and, on the other hand, can lead to a circular spread of the burst drops, thereby also causing the edge zone of the crack, perforation or crease line can be softened and thus also the above-mentioned folding accuracy problems can arise.

Weiterhin ist es vorteilhaft, wenn das Aufbringen, insbesondere das Aufsprühen, des Flüssigkeitsgemischs getaktet erfolgt. Dabei kann vorgesehen sein, dass der Sprühvorgang kurzzeitig unterbrochen wird, so dass das Flüssigkeitsgemisch nur im Bereich der Ritze, Perforation oder Rilllinie aufgebracht wird. Zur Taktung dieses Aufbring- oder Aufsprühvorgangs kann vorgesehen sein, dass die Taktung pneumatisch bspw. durch Unterbrechung der Druckgaszufuhr der Zweistoffdüse erfolgt. Weiterhin ist es möglich, dass die Taktung elektrisch erfolgt, wobei bspw. eine elektromotorisch antreibbare Düse vorgesehen sein kann, die zum Verschließen des Düsenauslasses der Zweistoffdüse ausgelegt ist.
Die eingangs genannte Aufgabe wird ferner durch eine Vorrichtung mit den Merkmalen des Anspruchs 13 gelöst. Die Vorrichtung umfasst eine Einrichtung zum Einbringen einer Ritze, Perforation oder Rilllinie in eine Voll- oder Wellpappe und wenigstens eine Zweistoffdüse die derart ausgelegt und angeordnet ist, dass ein Flüssigkeitsgemisch umfassend mindestens 96 Vol.-% Wasser und maximal 4 Vol.-% eines Tensids, vorzugsweise umfassend mindestens 98 Vol.-% Wasser und maximal 2 Vol.-% eines Tensids auf die zuvor in den Zuschnitt eingebrachte Ritze, Perforation oder Rilllinie durch Zerstäuben durch ein Druckgas aufgebracht werden kann oder derart ausgelegt und angeordnet ist, dass ein Flüssigkeitsgemischs umfassend mindestens 96 Vol.-% Wasser und maximal 4 Vol.-% eines Tensids, vorzugsweise umfassend mindestens 98 Vol.-% Wasser und maximal 2 Vol.-% eines Tensids vor Einbringen einer Ritze, Perforation oder Rilllinie auf den Zuschnitt aus Well- oder Vollpappe durch Zerstäuben durch ein Druckgas aufgebracht werden kann.
In einer ersten vorteilhaften Weiterbildung der Vorrichtung ist vorgesehen, dass die Einrichtung zum Einbringen der Ritze, Perforation oder Rilllinie eine drehbar gelagerte Sonotrode und einen drehbar gelagerten Amboss bzw. eine zweite Sonotrode umfasst. Es ist jedoch auch denkbar, dass die Einrichtung zum Einbringen der Ritze, Perforation oder Rilllinie einen mechanischen Rillkörper umfasst, der zur Erzeugung einer Rilllinie ohne die Verwendung von Ultraschall ausgelegt ist.It is also advantageous if the application, in particular the spraying, of the liquid mixture is carried out in a clocked manner. It can be provided that the spraying process is briefly interrupted, so that Liquid mixture is only applied in the area of the crack, perforation or crease line. To cycle this application or spraying process, it can be provided that the cycle is carried out pneumatically, for example by interrupting the compressed gas supply to the two-component nozzle. Furthermore, it is possible for the clocking to take place electrically, for example an nozzle which can be driven by an electric motor and which is designed to close the nozzle outlet of the two-component nozzle can be provided.
The above-mentioned object is further achieved by a device with the features of claim 13. The device comprises a device for introducing a crevice, perforation or crease line into a solid or corrugated cardboard and at least one two-substance nozzle which is designed and arranged in such a way that a liquid mixture comprising at least 96% by volume of water and a maximum of 4% by volume of a surfactant , preferably comprising at least 98% by volume of water and a maximum of 2% by volume of a surfactant can be applied to the crevice, perforation or crease line previously introduced into the blank by atomization by means of a compressed gas or is designed and arranged in such a way that it comprises a liquid mixture at least 96% by volume of water and a maximum of 4% by volume of a surfactant, preferably comprising at least 98% by volume of water and a maximum of 2% by volume of a surfactant, before introducing a crack, perforation or crease line onto the cut from corrugated or Solid cardboard can be applied by atomization using a compressed gas.
In a first advantageous development of the device it is provided that the device for introducing the score, perforation or crease line comprises a rotatably mounted sonotrode and a rotatably mounted anvil or a second sonotrode. However, it is also conceivable that the device for introducing the scoring, perforation or scoring line comprises a mechanical scoring body which is designed to produce a scoring line without the use of ultrasound.

Besonders bevorzugt ist es dabei, wenn die Zweistoffdüse einen ersten Düseneinlass für das Flüssigkeitsgemisch und einen zweiten Düseneinlass für ein Druckgas aufweist, und dass die Zweistoffdüse einen Düsenauslass für die zerstäubte Flüssigkeit aufweist.It is particularly preferred if the two-substance nozzle has a first nozzle inlet for the liquid mixture and a second nozzle inlet for a compressed gas, and that the two-substance nozzle has a nozzle outlet for the atomized liquid.

Weiterhin ist es vorteilhaft, wenn wenigstens eine Zweistoffdüse vorgesehen ist, die derart angeordnet ist, dass das Flüssigkeitsgemisch auf eine Oberseite des Zuschnitts aus Well- oder Vollpappe aufgebracht werden kann und/oder wenn wenigstens eine Zweistoffdüse vorgesehen ist, die derart angeordnet ist, dass das Flüssigkeitsgemisch auf eine Unterseite des Zuschnitts aus Well- oder Vollpappe aufgebracht werden kann.Furthermore, it is advantageous if at least one two-substance nozzle is provided, which is arranged in such a way that the liquid mixture can be applied to an upper side of the blank made of corrugated or solid cardboard and / or if at least one two-substance nozzle is provided, which is arranged in such a way that the Liquid mixture can be applied to an underside of the blank made of corrugated or solid cardboard.

Vorteilhafterweise ist eine Druckluftquelle vorgesehen, die zur Bereitstellung eines Druckgasdrucks im Bereich von etwa 2.5 bar bis etwa 7 bar ausgelegt ist. Besonders bevorzugt ist es dabei, wenn die Druckluftquelle zur Bereitstellung eines Druckgasdrucks von etwa 5 bar ausgelegt ist. Ein solcher Druckgasdruck hat sich als vorteilhaft erwiesen, um eine für ein schnelles Eindringen des Flüssigkeitsgemischs in die Oberfläche der Wellpappe besonders vorteilhafte Tropfengröße des Flüssigkeitsgemischs erreichen zu können und um die kinetische Energie der Tropfen derart zu beeinflussen, dass die Tropfen des Flüssigkeitsgemischs schnell in die Oberfläche der Wellpappe eindringen.A compressed air source is advantageously provided, which is designed to provide a compressed gas pressure in the range from approximately 2.5 bar to approximately 7 bar. It is particularly preferred if the compressed air source is designed to provide a compressed gas pressure of approximately 5 bar. Such a pressure gas pressure has proven to be advantageous in order to be able to achieve a drop size of the liquid mixture which is particularly advantageous for a rapid penetration of the liquid mixture into the surface of the corrugated cardboard and to influence the kinetic energy of the drops in such a way that the drops of the liquid mixture quickly into the surface of corrugated cardboard.

Eine weitere vorteilhafte Ausgestaltung der Vorrichtung sieht vor, dass die Vorrichtung eine Einrichtung zur Anordnung der Wellpappe in einer Besprühposition aufweist, wobei der Düsenauslass der Zweistoffdüse derart angeordnet ist, dass er bei in der Besprühposition befindlicher Wellpappe in einem Abstand zu einer Oberseite und/oder einer Unterseite der Wellpappe von etwa 3 bis 8 mm angeordnet ist. Ein derartiger Abstand des Düsenauslasses der Zweistoffdüse zu einer Oberseite und/oder Unterseite der Wellpappe hat sich als vorteilhaft erwiesen, um eine zu große Breite des die Wellpappe erreichenden Tropfenstrahls zu vermeiden und somit ein Erweichen der Wellpappe in Randbereichen einer herzustellenden Ritze, Perforation oder Rilllinie zu vermeiden. Die Einrichtung zur Anordnung der Wellpappe in einer Besprühposition kann beispielsweise als plattenförmiges Auflager oder als Transportrollen ausgebildet sein.A further advantageous embodiment of the device provides that the device has a device for arranging the corrugated cardboard in a spraying position, the nozzle outlet of the two-substance nozzle being arranged such that it is at a distance from an upper side and / or at a point when the corrugated cardboard is in the spraying position Bottom of the corrugated cardboard is arranged from about 3 to 8 mm. Such a distance from the nozzle outlet of the two-substance nozzle to an upper side and / or lower side of the corrugated cardboard has proven to be advantageous in order to avoid too large a width of the droplet jet reaching the corrugated cardboard and thus to soften the corrugated cardboard in the edge regions of a crack, perforation or crease line to be produced avoid. The device for arranging the corrugated cardboard in a spraying position can be designed, for example, as a plate-shaped support or as transport rollers.

Vorteilhafterweise ist der Düsenauslass in einem Winkel von etwa 45° zu einer parallel zu einer Transportrichtung der Wellpappe angeordneten Ebene angeordnet.The nozzle outlet is advantageously arranged at an angle of approximately 45 ° to a plane arranged parallel to a direction of transport of the corrugated cardboard.

Weitere Einzelheiten und vorteilhafte Weiterbildungen der Erfindung sind der nachfolgenden Beschreibung zu entnehmen, anhand derer eine Ausführungsform der Erfindung näher beschrieben und erläutert ist.Further details and advantageous developments of the invention can be found in the following description, on the basis of which an embodiment of the invention is described and explained in more detail.

Es zeigen:

  • Figur 1 eine schematische Ansicht eines Teils einer erfindungsgemäßen Vorrichtung zur Faltung von Zuschnitten aus Well- oder Vollpappe für die Herstellung von Faltschachteln;
  • Figur 2 einen Schnitt durch eine Zweistoffdüse der Vorrichtung gemäß Figur 1;
  • Figur 3 einen vergrößerten Ausschnitt der Vorrichtung gemäß Figur 1;
  • Figur 4 einen weiteren vergrößerten Ausschnitt der Vorrichtung gemäß Figur 1;
  • Figur 5 einen Zerstäubungsvorgang bei der Verwendung der Zweistoffdüse gemäß Figur 2 mit einem Druckgasdruck von etwa 0,5 bar;
  • Figur 6 einen Zerstäubungsvorgang bei der Verwendung der Zweistoffdüse gemäß Figur 2 mit einem Druckgasdruck von etwa 2,5 bar; und
  • Figur 7 einen Zerstäubungsvorgang bei der Verwendung der Zweistoffdüse gemäß Figur 2 mit einem Druckgasdruck von etwa 5 bar.
Show it:
  • Figure 1 a schematic view of part of an apparatus according to the invention for folding blanks from corrugated or solid cardboard for the production of folding boxes;
  • Figure 2 a section through a two-fluid nozzle of the device according Figure 1 ;
  • Figure 3 an enlarged section of the device according Figure 1 ;
  • Figure 4 a further enlarged section of the device according to Figure 1 ;
  • Figure 5 an atomization process when using the two-component nozzle according to Figure 2 with a compressed gas pressure of about 0.5 bar;
  • Figure 6 an atomization process when using the two-component nozzle according to Figure 2 with a compressed gas pressure of about 2.5 bar; and
  • Figure 7 an atomization process when using the two-component nozzle according to Figure 2 with a compressed gas pressure of about 5 bar.

In den Figuren 1 bis 4 sind Abschnitte einer erfindungsgemäßen Vorrichtung 10 zur Faltung von Zuschnitten aus Well- oder Vollpappe für die Herstellung von Faltschachteln gezeigt.In the Figures 1 to 4 Sections of a device 10 according to the invention for folding blanks from corrugated or solid cardboard for the production of folding boxes are shown.

Figur 1 zeigt dabei einen Zuschnitt einer einwelligen Wellpappe 12, in den in einem vorgelagerten Prozessschritt mittels der Vorrichtung 10 bereits eine Mehrzahl von Rilllinien 14 eingebracht wurde. Der Zuschnitt der einwelligen Wellpappe 12 umfasst dabei eine obere ebene Papierbahn 16, eine untere ebene Papierbahn 18, sowie eine gewellte Papierbahn 20, die zwischen den beiden ebenen Papierbahnen 16, 18 angeordnet ist. Figure 1 shows a blank of a single-wall corrugated cardboard 12, into which a plurality of creasing lines 14 have already been introduced in a preceding process step by means of the device 10. The cutting of the single-wall corrugated cardboard 12 comprises an upper flat paper web 16, a lower flat paper web 18 and one corrugated paper web 20, which is arranged between the two flat paper webs 16, 18.

Die Vorrichtung 10 weist eine in den Figuren nicht gezeigte Einrichtung zum Einbringen der Rilllinien 14 auf, die eine drehbar gelagerte Sonotrode und einen drehbar gelagerten Amboss bzw. eine zweite drehbar gelagerte Sonotrode umfasst, so dass die Rilllinie 14 ultraschallunterstützt in die Wellpappe 12 eingebracht werden kann. Es ist jedoch auch denkbar, dass die Rilllinien mit einem mechanischen Rillkörper in die Wellpappe 12 ohne den Einsatz von Ultraschall eingebracht werden.The device 10 has a device (not shown in the figures) for introducing the creasing lines 14, which comprises a rotatably mounted sonotrode and a rotatably mounted anvil or a second rotatably mounted sonotrode, so that the creasing line 14 can be introduced into the corrugated cardboard 12 with ultrasound support , However, it is also conceivable for the creasing lines to be introduced into the corrugated cardboard 12 with a mechanical creasing body without the use of ultrasound.

Die Vorrichtung 10 weist als Zweistoffdüsen 22 ausgebildete Sprühdüsen auf, welchen über Leitungen 24 ein Druckgas, insbesondere Druckluft mit einem Druck im Bereich von etwa 0,5 bar bis etwa 16 bar und ein Flüssigkeitsgemisch zugeführt wird und durch welche das Flüssigkeitsgemisch auf die Rilllinien 14 aufgebracht wird. Das Flüssigkeitsgemisch umfasst mindestens 96 Vol.-% Wasser und maximal 4 Vol.-% eines Tensids, vorzugsweise mindestens 98 Vol.-% Wasser und maximal 2 Vol.-% eines Tensids. Zwei Zweistoffdüsen 22 sind derart angeordnet, dass das Flüssigkeitsgemisch auf eine Oberseite 25 der Wellpappe 12 aufgebracht werden kann, wobei zwei Zweistoffdüsen 22 derart angeordnet sind, dass das Flüssigkeitsgemisch auf eine Unterseite 27 der Wellpappe aufgebracht werden kann. Ein Aufbringen des Flüssigkeitsgemischs auf die Ober- und Unterseite 25, 27 hat sich dabei als besonders vorteilhaft erwiesen, wobei bei einseitig mit empfindlichen Lacken beschichteten Zuschnitten vorgesehen sein kann, das Flüssigkeitsgemisch nur auf die Oberseite 25 oder nur auf die Unterseite 27 aufzubringen.The device 10 has spray nozzles designed as two-substance nozzles 22, to which a compressed gas, in particular compressed air with a pressure in the range from approximately 0.5 bar to approximately 16 bar and a liquid mixture is fed via lines 24 and through which the liquid mixture is applied to the creasing lines 14 becomes. The liquid mixture comprises at least 96% by volume of water and a maximum of 4% by volume of a surfactant, preferably at least 98% by volume of water and a maximum of 2% by volume of a surfactant. Two two-substance nozzles 22 are arranged such that the liquid mixture can be applied to an upper side 25 of the corrugated cardboard 12, two two-substance nozzles 22 being arranged such that the liquid mixture can be applied to an underside 27 of the corrugated cardboard. Applying the liquid mixture to the upper and lower sides 25, 27 has proven to be particularly advantageous, it being possible to provide the liquid mixture only on the upper side 25 or only on the lower side 27 in the case of blanks coated on one side with sensitive paints.

Eine Zweistoffdüse 22 der Vorrichtung 10 ist in Figur 2 im Schnitt gezeigt. Die Zweistoffdüse 22 weist eine Spindel 24 mit einem ersten Düseneinlass 26 für das Flüssigkeitsgemisch und einem zweiten Düseneinlass 28 für das Druckgas auf, wobei das Flüssigkeitsgemisch in Richtung des Pfeils 30 in die Zweistoffdüse 22 eingeleitet wird und wobei das Druckgas in Richtung des Pfeils 32 in die Zweistoffdüse 22 eingeleitet wird.A two-component nozzle 22 of the device 10 is shown in FIG Figure 2 shown in section. The two-substance nozzle 22 has a spindle 24 with a first nozzle inlet 26 for the liquid mixture and a second nozzle inlet 28 for the pressurized gas, the liquid mixture being introduced into the two-substance nozzle 22 in the direction of arrow 30 and the pressurized gas in the direction of arrow 32 in FIG Two-component nozzle 22 is introduced.

Die Zweistoffdüse 22 weist einen Düsenauslass 34 auf, aus dem im Betrieb der Vorrichtung 10 bzw. der Zweistoffdüse 22 ein Tropfenstrahl 36 austritt, dessen Tropfen einen Durchmesser im Bereich von etwa 15 bis etwa 25 µm, vorzugsweise mit einem Durchmesser von etwa 20 µm aufweisen. Zur Erzeugung derartig kleiner Tropfen ist es besonders vorteilhaft, das oben genannte Flüssigkeitsgemisch zu verwenden, da aufgrund der Verwendung des Tensids ein Wassergemisch mit einer vergleichsweise geringen Oberflächenspannung bereitgestellt werden kann.The two-substance nozzle 22 has a nozzle outlet 34, from which a drop jet 36 emerges during operation of the device 10 or the two-substance nozzle 22, the drops of which have a diameter in the range from approximately 15 to approximately 25 μm, preferably with a diameter of approximately 20 μm. To produce such small drops, it is particularly advantageous to use the above-mentioned liquid mixture, since a water mixture with a comparatively low surface tension can be provided due to the use of the surfactant.

Die Tropfen des Tropfenstrahls 36 können aufgrund der Verwendung der Zweistoffdüse 22 durch das unter Druck stehende Druckgas mit einer vergleichsweise hohen kinetischen Energie auf einen Zuschnitt aus Wellpappe 12 aufgebracht werden, so dass die vergleichsweise kleinen Tropfen schnell in die poröse Oberfläche des Zuschnitts aus Wellpappe 12 eindringen können und dort in die Fasern des Zuschnitts aus Wellpappe 12 eindringen und die Fasern aufweichen können.The drops in the drop jet 36 can be applied to a blank of corrugated cardboard 12 with a comparatively high kinetic energy due to the use of the two-component nozzle 22 by the pressurized compressed gas, so that the comparatively small drops quickly penetrate into the porous surface of the blank made of corrugated cardboard 12 can and penetrate into the fibers of the blank of corrugated cardboard 12 and can soften the fibers.

Dabei ist eine Druckluftquelle 38 (vgl. Figur 1) vorgesehen, die zur Bereitstellung eines Druckgasdrucks im Bereich von etwa 2.5 bar bis etwa 7 bar, vorzugsweise von etwa 5 bar ausgelegt ist. Ein solcher Druckgasdruck hat sich als vorteilhaft erwiesen, um eine für ein schnelles Eindringen des Flüssigkeitsgemischs in die Oberfläche der Wellpappe 12 besonders vorteilhafte Tropfengröße des Flüssigkeitsgemischs erreichen zu können und um die kinetische Energie der Tropfen derart zu beeinflussen, dass die Tropfen des Flüssigkeitsgemischs schnell in die Oberfläche der Wellpappe eindringen.A compressed air source 38 (cf. Figure 1 ) provided to provide a compressed gas pressure in the range of about 2.5 bar to about 7 bar, preferably from is designed around 5 bar. Such a pressure gas pressure has proven to be advantageous in order to be able to achieve a drop size of the liquid mixture which is particularly advantageous for a rapid penetration of the liquid mixture into the surface of the corrugated cardboard 12 and to influence the kinetic energy of the drops in such a way that the drops of the liquid mixture quickly get into the Penetrate the surface of the corrugated cardboard.

Die Figuren 5 bis 7 zeigen hierzu einen Zerstäubungsvorgang bei der Verwendung der Zweistoffdüse gemäß Figur 2 mit verschiedenen Druckgasdrücken. In Figur 5 wird lediglich ein Druckgasdruck von etwa 0,5 bar verwendet, dies führt zu extrem großen Tropfen 40, wobei bei den in Figur 6 gezeigten Tropfen 40 ein Druckgasdruck von etwa 2,5 bar verwendet wird. Für ein optimales Zerstäubungsergebnis wird ein Druckgasdruck von etwa 5 bar verwendet, wobei sich damit die in Figur 7 gezeigten Tropfen 40 erreichen lassen, die einerseits aufgrund der geringen Tropfengröße und andererseits aufgrund der hohen kinetischen Energie schnell in die Oberfläche der Wellpappe 12 eindringen können.The Figures 5 to 7 show an atomization process when using the two-substance nozzle according to Figure 2 with different pressurized gas pressures. In Figure 5 if only a compressed gas pressure of about 0.5 bar is used, this leads to extremely large droplets 40 Figure 6 Drop 40 shown a pressure gas pressure of about 2.5 bar is used. A compressed gas pressure of about 5 bar is used for an optimal atomization result Figure 7 drop 40 can be achieved, which can penetrate quickly into the surface of the corrugated cardboard 12 on the one hand due to the small drop size and on the other hand due to the high kinetic energy.

Die Vorrichtung 10 weist ferner eine Einrichtung zur Anordnung der Wellpappe in einer Besprühposition auf (ohne Bezugszeichen), wobei der Düsenauslass 34 der Zweistoffdüse 22 derart angeordnet ist, dass er bei in der Besprühposition befindlicher Wellpappe 12 in einem Abstand 42 zu einer Oberseite 25 und/oder einer Unterseite 27 der Wellpappe 12 von etwa 3 bis 8 mm angeordnet ist. Dieser Abstand ist in Figur 3 deutlich zu erkennen, die einen vergrößerten Ausschnitt der Vorrichtung 10 gemäß Figur 1 zeigt. Ein derartiger Abstand 42 des Düsenauslasses 34 der Zweistoffdüse 22 zu der Oberseite 25 und/oder Unterseite 27 der Wellpappe 12 hat sich als vorteilhaft erwiesen, um eine zu große Breite des die Wellpappe erreichenden Tropfenstrahls 36 zu vermeiden und somit ein Erweichen der Wellpappe in Randbereichen einer herzustellenden Ritze, Perforation oder Rilllinie 14 zu vermeiden. Die Einrichtung zur Anordnung der Wellpappe 12 in einer Besprühposition kann beispielsweise als plattenförmiges Auflager oder als Transportrollen ausgebildet sein.The device 10 also has a device for arranging the corrugated cardboard in a spraying position (without reference number), the nozzle outlet 34 of the two-substance nozzle 22 being arranged such that it is at a distance 42 from an upper side 25 and / when the corrugated cardboard 12 is in the spraying position. or an underside 27 of the corrugated cardboard 12 of approximately 3 to 8 mm is arranged. This distance is in Figure 3 can clearly be seen which according to an enlarged section of the device 10 Figure 1 shows. Such a distance 42 of the nozzle outlet 34 of the two-substance nozzle 22 to the top 25 and / or bottom 27 of the corrugated cardboard 12 has proven to be advantageous in order to to avoid excessive width of the droplet jet 36 reaching the corrugated cardboard and thus to avoid softening of the corrugated cardboard in edge regions of a crack, perforation or crease line 14 to be produced. The device for arranging the corrugated cardboard 12 in a spraying position can be designed, for example, as a plate-shaped support or as transport rollers.

Figur 4 zeigt einen weiteren Ausschnitt der Vorrichtung 10 gemäß Figur 1 bei Blick in Richtung des in den Figuren 1 und 3 gezeigten Pfeils 44. Dort ist die Transportrichtung der Wellpappe 12 durch die Vorrichtung 10 durch den Pfeil 46 gekennzeichnet. Die Figuren 1 und 3 zeigen somit die Vorrichtung 10 orthogonal zur durch den Pfeil 46 dargestellten Transportrichtung. Wie Figur 4 deutlich zu entnehmen ist, ist der Düsenauslass 34 bzw. eine Mittellängsachse 48 der Zweistoffdüse 22 in einem Winkel 50 von etwa 45° zu einer parallel zu einer Transportrichtung der Wellpappe 12 angeordneten Ebene 52 bzw. zur Oberseite 25 der Wellpappe 12 angeordnet. Figure 4 shows a further section of the device 10 according to Figure 1 looking in the direction of the Figures 1 and 3 shown arrow 44. There, the direction of transport of the corrugated cardboard 12 by the device 10 is indicated by the arrow 46. The Figures 1 and 3 thus show the device 10 orthogonal to the transport direction shown by the arrow 46. How Figure 4 It can be clearly seen that the nozzle outlet 34 or a central longitudinal axis 48 of the two-substance nozzle 22 is arranged at an angle 50 of approximately 45 ° to a plane 52 arranged parallel to a transport direction of the corrugated cardboard 12 or to the top side 25 of the corrugated cardboard 12.

Das Flüssigkeitsgemisch wird orthogonal zu der durch den Pfeil 46 gekennzeichneten Transportrichtung der Wellpappe 12 in einer Breite 54 (vgl. Figur 3) von etwa 3 mm auf die Oberseite 25 und/oder Unterseite 27 der Wellpappe 12 aufgebracht, insbesondere aufgesprüht. Somit kann ein Erweichen der Wellpappe 12 in einer Randzone der Ritze, Perforation oder Rilllinie 14 vermieden werden, wobei durch ein Erweichen der Randzone hervorgerufene Faltgenauigkeitsprobleme vermieden werden können.The liquid mixture becomes orthogonal to the direction of transport of the corrugated cardboard 12 indicated by the arrow 46 in a width 54 (cf. Figure 3 ) of about 3 mm applied to the top 25 and / or bottom 27 of the corrugated cardboard 12, in particular sprayed on. Thus, softening of the corrugated cardboard 12 in an edge zone of the score, perforation or crease line 14 can be avoided, and problems of folding accuracy caused by softening the edge zone can be avoided.

Dadurch, dass das Flüssigkeitsgemisch gezielt auf die Rilllinie 14 aufgesprüht wird, wird der Zuschnitt aus Wellpappe 12 im Bereich der Rilllinien 14 so schmiegsam, dass ein daran anschließender Faltungsvorgang entlang der Rilllinien 14 unabhängig davon, in welchem Bereich der Wellen eine Faltung vorgenommen wird, exakt längs der vorgegebenen Rilllinie 14 erfolgt, wodurch die Zuschnitte aus Wellpappe 12 exakt in der erforderlichen Weise gefaltet werden und somit der eingangs beschriebene Fishtailing-Effekt vermieden wird.Because the liquid mixture is sprayed specifically onto the crease line 14, the blank made of corrugated cardboard 12 becomes so supple in the area of the crease lines 14, that a subsequent folding process along the creasing lines 14 takes place exactly along the predetermined creasing line 14, regardless of the area in which the waves are folded, as a result of which the blanks of corrugated cardboard 12 are folded exactly in the required manner and thus the fishtailing described at the beginning Effect is avoided.

Claims (18)

  1. A method for folding blanks of corrugated or solid cardboard (12) for the production of folding boxes, including the following steps:
    - applying a liquid mixture, including at least 96 vol % of water and a maximum of 4 vol % of a tenside, preferably including at least 98 vol % of water and a maximum of 2 vol % of a tenside, to a score, perforation or furrow line (14) made beforehand in a blank of corrugated or solid cardboard (12), or applying a liquid mixture, including at least 96 vol % of water and a maximum of 4 vol % of a tenside, preferably including at least 98 vol % of water and a maximum of 2 vol % of a tenside, and ensuing making of a score, perforation or furrow line (14) in a blank of corrugated or solid cardboard (12);
    - folding the blank (12) along the score, perforation or furrow line (14), characterized in that the application of the liquid mixture is effected by sputtering the liquid mixture, using a two-substance nozzle (22), and the sputtering is effected by means of a compressed gas.
  2. The method of claim 1, characterized in that ambient air is used as the compressed gas.
  3. The method of claim 1 or claim 2, characterized in that in the application of the liquid mixture, a droplet stream (36) that has a droplet (40) is created.
  4. The method of claim 3, characterized in that droplets having a diameter in the range of ca. 15 to ca. 25 µm, preferably with a diameter of ca. 20 µm, are created.
  5. The method of at least one of the foregoing claims, characterized in that making the furrow line (14) is done by local compression of the solid cardboard or of various layers of the corrugated cardboard between a rotatably supported sonotrode and a rotatably supported anvil or a second sonotrode and exciting the compressed region of the solid cardboard or corrugated cardboard with ultrasound.
  6. The method of at least one of the foregoing claims, characterized in that the liquid mixture is applied to a top side (25) of the blank of corrugated or solid cardboard (12) and/or to an underside (27) of the blank of corrugated or solid cardboard (12).
  7. The method of at least one of the foregoing claims, characterized in that the liquid mixture is atomized at a compressed gas pressure in the range of ca. 2.5 bar to ca. 7 bar, preferably with a compressed gas pressure of ca. 5 bar.
  8. The method of at least one of the foregoing claims, characterized in that the application of the liquid mixture is done by means of a nozzle outlet (34) of the two-substance nozzle (22), which outlet is located at a spacing (42) of ca. 3 mm to 8 mm from a top side (25) and/or a bottom side (27) of the corrugated cardboard.
  9. The method of at least one of the foregoing claims, characterized in that the liquid mixture is applied, in particular sprayed on, orthogonally to a direction in which the corrugated cardboard (12) is transported, in a width (54) of ca. 3 mm to a top side (25) and/or a bottom side (27) of the corrugated cardboard (12).
  10. The method of at least one of the foregoing claims, characterized in that the liquid mixture is applied, in particular sprayed on, at an angle (50) of ca. 45° to a plane (52), located parallel to a direction in which the corrugated cardboard (12) is transported, to a top side (25) and/or a bottom side (27) of the corrugated cardboard (12).
  11. The method of at least one of the foregoing claims, characterized in that the application, in particular spraying on, of the liquid mixture is done in pulsed fashion.
  12. An apparatus (10) for performing the method of at least one of the foregoing claims, in particular an apparatus (10) for folding blanks of corrugated or solid cardboard (12) for the production of folding boxes, including a device for making a score, perforation or furrow line (14) in a solid or corrugated cardboard and at least one two-substance nozzle (22), which is designed and located such that a liquid mixture including at least 96 vol % of water, preferably including at least 98 vol % of water and a maximum of 2 vol % of a tenside, to the score, perforation or furrow line (14) made beforehand in the blank, can be applied by atomization by means of a compressed gas, or is designed and located such that a liquid mixture, including at least 96 vol % of water and a maximum of 4 vol % of a tenside, preferably including at least 98 vol % of water and a maximum of 2 vol % of a tenside, can be applied to the blank of corrugated or solid cardboard by atomization by means of a compressed gas, before making a score, perforation or furrow line (14) .
  13. The apparatus (10) of claim 12, characterized in that the device for introducing the score, perforation or furrow line (14) includes a rotatably supported sonotrode and a rotatably supported anvil or a second sonotrode.
  14. The apparatus (10) of claim 12 or 13, characterized in that the two-substance nozzle (22) has a first nozzle inlet (26) for the liquid mixture and a second nozzle inlet (28) for a compressed gas; and that the two-substance nozzle (22) has a nozzle outlet (34) for the atomized liquid mixture.
  15. The apparatus (10) of at least one of claims 12 through 14, characterized in that at least one two-substance nozzle (22) is provided, which is located such that the liquid mixture can be applied to a top side (25) of the blank of corrugated or solid cardboard (12), and/or that at least one two-substance nozzle (22) is provided, which is located such that the liquid mixture can be applied to a bottom side (27) of the blank of corrugated or solid cardboard (12).
  16. The apparatus (10) of at least one of claims 12 through 15, characterized in that a compressed-air source (38) is provided, which is designed for furnishing a compressed gas pressure in the range of ca. 2.5 bar to ca. 7 bar.
  17. The apparatus (10) of at least one of claims 14 through 16, characterized in that the apparatus (10) has a device for locating the corrugated cardboard (12) in a position for spraying, and the nozzle outlet (34) of the two-substance nozzle (22) is located such that, when the corrugated cardboard (12) is in the position for spraying, this outlet is located at a distance (42) of ca. 3 to 8 mm from a top side (25) and/or a bottom side (27) of the corrugated cardboard (12).
  18. The apparatus of at least one of claims 14 through 17, characterized in that the nozzle outlet (34) is located at an angle (50) of ca. 45° to a plane (52) located parallel to a direction in which the corrugated cardboard (12) is transported.
EP16785398.5A 2016-01-14 2016-10-14 Method and device for folding corrugated cardboard Active EP3402662B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102016100570.3A DE102016100570A1 (en) 2016-01-14 2016-01-14 Method and device for folding corrugated board
DE102016114660.9A DE102016114660A1 (en) 2016-08-08 2016-08-08 Method and device for folding corrugated board
PCT/EP2016/074645 WO2017121503A1 (en) 2016-01-14 2016-10-14 Method and device for folding corrugated cardboard

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EP3402662A1 EP3402662A1 (en) 2018-11-21
EP3402662B1 true EP3402662B1 (en) 2020-01-29

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WO (1) WO2017121503A1 (en)

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CN109109378A (en) * 2018-08-22 2019-01-01 江苏省海门中等专业学校 A kind of automatic moistening function device and operating procedure for preventing carton from bursting
CN109532100B (en) * 2019-01-15 2020-02-18 浙江骏驰纸制品有限公司 Corrugated paper dog-ear device
KR102696531B1 (en) 2019-07-11 2024-08-19 봅스트 리옹 Method of folding a cardboard blank to form a folded box
CN111923491B (en) * 2020-06-28 2022-06-28 浙江华熠印刷科技有限公司 Pressing line softening process for carton printing

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DE579710C (en) * 1932-04-14 1933-06-30 Saechsische Cartonnagen Maschi Method and device for the production of element sleeves
US3270628A (en) * 1962-09-20 1966-09-06 Specialty Equipment Corp Universal box folding machine
JP5333922B2 (en) * 2009-04-30 2013-11-06 レンゴー株式会社 Corrugated cardboard crack prevention processing method
AT512357B1 (en) * 2012-01-12 2013-09-15 Flatz Verpackungen Styropor Gmbh METHOD FOR FOLDING CROPS EXISTING FROM WAVE CAP FOR THE MANUFACTURE OF FOLDING BOXES AND APPARATUS THEREFOR

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EP3402662A1 (en) 2018-11-21

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