EP2974798B1 - Device for applying a glue track to a wrapping strip of a rod-shaped product of the tobacco processing industry - Google Patents

Device for applying a glue track to a wrapping strip of a rod-shaped product of the tobacco processing industry Download PDF

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Publication number
EP2974798B1
EP2974798B1 EP15174993.4A EP15174993A EP2974798B1 EP 2974798 B1 EP2974798 B1 EP 2974798B1 EP 15174993 A EP15174993 A EP 15174993A EP 2974798 B1 EP2974798 B1 EP 2974798B1
Authority
EP
European Patent Office
Prior art keywords
glue
roller
wrapping strip
nozzle
outlet opening
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
EP15174993.4A
Other languages
German (de)
French (fr)
Other versions
EP2974798A1 (en
Inventor
Ralf Soltow
Peter Golz
Thomas Busch
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.)
Koerber Technologies GmbH
Original Assignee
Hauni Maschinenbau GmbH
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Filing date
Publication date
Application filed by Hauni Maschinenbau GmbH filed Critical Hauni Maschinenbau GmbH
Priority to PL15174993T priority Critical patent/PL2974798T3/en
Publication of EP2974798A1 publication Critical patent/EP2974798A1/en
Application granted granted Critical
Publication of EP2974798B1 publication Critical patent/EP2974798B1/en
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Anticipated expiration legal-status Critical

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Classifications

    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24C—MACHINES FOR MAKING CIGARS OR CIGARETTES
    • A24C5/00—Making cigarettes; Making tipping materials for, or attaching filters or mouthpieces to, cigars or cigarettes
    • A24C5/14—Machines of the continuous-rod type
    • A24C5/24—Pasting the seam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
    • B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
    • B05C1/0813—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line characterised by means for supplying liquid or other fluent material to the roller
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
    • B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
    • B05C1/0826—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line the work being a web or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
    • B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
    • B05C1/0839—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line the work being unsupported at the line of contact between the coating roller and the work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
    • B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
    • B05C1/0856—Reverse coating rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
    • B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
    • B05C1/12—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line the work being fed round the roller

Definitions

  • the invention relates to a device for applying a glue line to a wrapping strip of a rod-shaped product of the tobacco processing industry with the features of the preamble of claim 1.
  • the document EP 0 755 636 A1 discloses an apparatus having the features of the preamble of claim 1.
  • the wrapping strip generally serves to fix the shape of the rod-shaped products, which e.g. Pre-products, such as filter rods or tobacco, or even finished products, such as Cigarettes, cigarillos, with and without filters.
  • Pre-products such as filter rods or tobacco
  • finished products such as Cigarettes, cigarillos, with and without filters.
  • the wrapping strip is first deflected and placed on an endless conveyor belt in a continuous manufacturing process. Then a filter material made of loose filter material fibers, filter segments or a strand of not yet fixed tobacco fibers is placed on the wrapping strip.
  • the wrapping strip with the strand lying thereon is then passed through a shaping section in which the wrapping strip is turned up on the side of the strand and provided with a thin line of glue on one edge side.
  • the wrapping strip is then further wrapped around the strand until the edges of the wrapping strip overlap.
  • the edge sides of the wrapping strip are then glued to one another by exerting a slight pressure and / or thermal energy via the glue seam, so that the strand is then fixed in shape in cross section by the wrapping strip.
  • the glue trail can also be in shape can be applied by glue dots with a certain distance, which is the case, for example, if the filter segments adhere to under-gluing.
  • the glue dots and the tow material are applied to the center of the wrapping strip at a point far before the wrapping strip is turned over, and serve to pre-fix the filter segments on the wrapping strip.
  • the use of glue dots is a special case; it is normal to use a glue track for both monofilters (tow) and multifilters (segments).
  • a nozzle with a round opening cross-section with a diameter of e.g. 1.6 mm is provided, over which the glue is continuously e.g. is applied with a gear pump in a predetermined volume.
  • the volume of glue applied can in this case e.g. can be controlled by a speed control of the gear pump.
  • systems with a line speed of more than 600 m / min, such as 700 m / min or more and it cannot be ruled out that, in order to reduce the manufacturing costs, the strand speed is fundamentally increased even further.
  • the time span in which the wrapping strip is guided past the edge sections of the nozzle opening that are parallel to the transport direction is significantly shorter than the time span in which the wrapping strip is guided past the central section of the outlet opening.
  • both of these circumstances mean that significantly more glue is applied in the middle of the glue line than in the edge sections.
  • glue penetration Due to the excess of the glue exit speed and thus also the amount of glue in the middle of the exit opening of the nozzle, a larger proportion of the glue in the center of the exit opening passes through the porous wrapping strip without contributing to the gluing of the edges of the wrapping strip. This effect is also known as glue penetration.
  • the glue penetration depends on the porosity of the covering strip and increases with it. In addition to a undesired possible change in taste of the products, the glue penetration leads to undesired contamination of the entire device or system and the subsequent products. As a result of the glue penetration, the bond strength is further reduced in addition to the reduction in bond strength due to the different distribution.
  • the filter material Since the filter material is also strongly compressed during the production of the strand and is only stabilized in cross-linked form by the drying of the applied acetate, the filter material still exerts a relatively high restoring force at the time of gluing. For this reason, a hot glue seam with a high adhesive force that is immediately effective is applied to the wrapping strip.
  • the hot glue is not resistant to aging and the filters are not processed further in any case, the gluing of the edges can optionally be stabilized by a second cold glue seam, also known as a support seam, running parallel to the hot glue seam.
  • the wrapping strip for curing the cold glue seam is guided past a heating bar with as little pressure as possible, while in filter machines usually only the hot glue seam is hardened by a cooling bar during the production process.
  • the optional cold glue seam provided for the filter machine hardens in contrast to cigarette production without a thermal energy supply. In principle, the excess glue mass can adversely affect both the curing process and the guidance of the wrapping strip as such.
  • the cold glue line and the hot glue line are applied in parallel on a very narrow edge section of the wrapping strip of the filter. Because of the very narrow marginal strip the glue traces must be applied with the smallest possible deviation in shape from a given course and a given width.
  • the glue track in the form of a foam, which is formed by adding gas bubbles, in particular inert gas or air bubbles, to the liquid glue.
  • the invention is based on the object of providing a generic device with which a glue line with the greatest possible adhesive force with at the same time the least possible contamination of the wrapping strip and the device or the environment is possible.
  • a rotationally driven roller is provided between the wrapping strip and the outlet opening of the nozzle, to which the glue emerging from the outlet opening is applied and which applies the glue directly to the wrapping strip, the direction of rotation of the roller is directed so that the movement of the roller on the side facing the facing the wrapping strip moved by, is directed opposite to the movement of the wrapping strip.
  • the advantage of the proposed solution can be seen in the fact that the glue emerging from the outlet opening is first rubbed on the roller to a constant width, with an almost constant thickness.
  • the glue line is then applied directly to the wrapping strip by the roller or is transported away from the roller directly by the wrapping strip. A ring of glue is created on the roller while the glue is continuously fed through the outlet opening.
  • the movement of the roller in the opposite direction to the wrapping strip when applying the glue line is of particular importance, since the glue line is practically rubbed on the wrapping strip.
  • a glue line with a constant width can be achieved up to a strand speed of the wrapping strip of 600 m / min and beyond.
  • the speed of the roller can be changed.
  • the proposed further development creates a new parameter with the help of which the width of the glue line can be changed. This means that the glue line width can be adapted very easily to the new product after a format change in the system for manufacturing products with different dimensions, without having to replace parts.
  • roller has a diameter of 2 to 12 mm and is driven at a speed of 1000 rpm to 12000 rpm, resulting in peripheral speeds of 50 to 150 m / min.
  • At least two outlet openings arranged one behind the other in the axial direction of the roller can be provided, from which the glue is applied to the roller.
  • the glue line can be widened with a very high uniform distribution at the same time.
  • two parallel glue lines can be applied to the wrapping strip.
  • the invention can be implemented particularly cost-effectively if the roller is formed by a shaft driven by an electric motor. In addition, this results in a device with a particularly simple structural design. Since the roller only needs to have a free section for applying the glue, the only structural requirement is that the shaft must be freely accessible in a short piece.
  • the area in which the glue is applied to the roller and the area in which the glue is applied from the roller to the wrapping strip are arranged opposite one another on the roller.
  • the glue is distributed over a circumferential section of approximately 180 degrees on the roller before it is applied to the wrapping strip or is transported away from the wrapping strip.
  • the roller is practically between the wrapping strip and the nozzle.
  • the glue has a viscosity of at least 180 mPas.
  • the application of highly viscous glues with a viscosity higher than 180 mPas with a constant width is problematic when the glue track is applied directly.
  • the highly viscous glue with the proposed solution over the roller to the wrapping strip the constant width of the glue track can be achieved much more easily, since the glue is first distributed over a certain width by applying it to the roller, despite its high viscosity then applied to the wrapping strip.
  • a glue seam with a sufficiently high bond strength could be achieved by applying the glue in an amount of 5g to 40g is applied per 500 m length of the wrapping strip.
  • the solution according to the invention made it possible to produce a glue seam with very good adhesive strength when the transport speed of the wrapping strip is between 100 m / min and 700 m / min.
  • the roller is arranged eccentrically to the outlet opening of the nozzle.
  • the eccentric arrangement of the roller deliberately creates a larger free space on one side of the roller between the outlet opening of the nozzle and the roller, in which the emerging glue is first dammed up in a glue reservoir before it is transported away by the rotary movement of the roller.
  • the glue reservoir practically even out the application of the glue to the roller, which further improves the quality of the glue seam.
  • the glue reservoir can be made larger or smaller by dimensioning the eccentricity, the gap width, the amount of the inflowing glue and the speed of the roller.
  • the roller is preferably offset eccentrically in the direction of the edge of the outlet opening of the nozzle, which is arranged downstream in relation to the direction of rotation of the roller.
  • the glue is thereby applied to the roller through a narrowed gap between the roller and the edge of the outlet opening from the glue reservoir, whereby the thickness of the glue line applied to the roller is limited to a maximum.
  • the edge side of the outlet opening which is arranged downstream in relation to the direction of rotation of the roller is in the direction
  • the roller is shaped above, whereby the gap between the roller and the nozzle on the side on which the glue is applied to the roller, is further reduced, which in turn the quality of the glue line on the roller and thus the quality of the glue seam on the Wrapping strip is improved.
  • a device according to the invention with a nozzle 2, held fixed to the machine, with an outlet opening 3 and a rotatably driven roller 4 arranged at outlet opening 3 can be seen.
  • the roller 4 is in this case the end of a shaft guided out of an electric motor 5 and is driven to rotate in the direction of arrow A.
  • the electric motor 5, like the nozzle 2, is held fixed to the machine and can therefore be regarded as being stationary together with the roller 4 (the shaft that is led out). Furthermore, an endless wrapping strip 1 can be seen, which by means of a transport device (not shown) in the direction of the arrow B is transported at a transport speed of 100 m / min up to 700 m / min, preferably 600 m / min.
  • the roller 4 is arranged between the wrapping strip 1 and the outlet opening 3 of the nozzle 2, that is, it is arranged opposite the peripheral section of the roller 4 in which the roller 4 comes to rest on the wrapping strip 1.
  • the term stationary also includes a roller 4 or a nozzle 2, which during the application of glue or before the application of glue can perform slight movements with the axis of rotation to the wrapping strip 1 or to one another, whereby the alignment of the roller 4 and the nozzle 2 to one another and to the wrapping strip 1 can vary or be adjusted slightly.
  • the term “fixed” it is only important that the application movement of the glue track on the wrapping strip 1 occurs as the wrapping strip 1 moves past the roller 4 or opposite the nozzle 2.
  • the glue line is practically transported away from the roller 4 by the movement of the wrapping strip 1, the possible slight movements of the roller 4 or the nozzle 2 for setting the alignment and / or during the application of the glue line being negligible for the application movement of the glue line .
  • the roller 4 is driven clockwise in the illustration in the direction of arrow A, so that the roller 4 in the section which lies opposite the wrapping strip 1 or in the section in which it comes to rest on the wrapping strip 1, is opposite to the transport direction of the Wrapping strip 1 moved.
  • the glue emerging from the outlet opening 3 of the nozzle 2 is thereby transported away from the roller 4 in a clockwise direction and applied to the wrapping strip 1 in the form of a glue track 6 with a constant width.
  • the glue is used in an amount of 5 g to 40 g per 500 meters Length of the wrapping strip 1 applied.
  • the roller 4 is cleaned again in the movement running off the wrapping strip 1, which can also be seen because the layer thickness of the glue on the roller 4 is considerably thinner in this section. As a result, the so-called "glue nose" that has previously occurred on the nozzle 2 can be avoided.
  • the glue is applied by rubbing on the wrapping strip 1 much more evenly in terms of width and thickness of the glue line than was possible with the previously used solution of direct application of the glue line via the nozzle 2, so that after the gluing of the layers of the wrapping strip 1 has a considerably stronger glue seam with a greater adhesive strength.
  • the greater adhesive strength is achieved in that the glue is used completely to form a composite layer between the fibers of the wrapping strip 1 for bonding.
  • This homogeneous composite layer leads to an increased bond strength, since a layer consisting exclusively of glue with a lower bond strength according to experience is no longer present. In this case, using less glue leads to a higher bond strength and less pollution of the machine.
  • the glue seam is formed from cold glue with a layer consisting exclusively of glue, which is then led past a heating bar and cured, there is also the risk that the water in the glue mass will evaporate and harden on the heating bar in the glue mass thereby forming small cavities. These cavities then each form interruptions in the adhesive seam and reduce the adhesive strength by the adhesive seam tearing under load in a tear line running through the cavities. Since the glue seam is applied in a much more controlled manner with the solution according to the invention and a layer consisting exclusively of glue mass can be avoided in the glue seam, the adhesive strength can be increased as a result by the solution according to the invention.
  • the solution according to the invention made it possible to achieve a very uniform glue seam with a substantially constant thickness and a consistently high bond strength even at very high strand speeds. This is due to the fact that the glue seam is first rubbed over a larger width with a more constant thickness by being applied to the roller 4 before it is applied to the wrapping strip 1, and only then is applied to the wrapping strip 1 by the roller 4.
  • the nozzle 2 is shaped on the edge delimiting the outlet opening 3 in such a way that the lower edge side 7 in the illustration protrudes in the direction of the roller 4.
  • the roller 4 is arranged eccentrically, ie the axis of rotation of the roller 4 is arranged by the dimension E below the center M of the outlet opening 3. Due to the eccentric arrangement of the roller 4 and the protruding edge side 7 arranged downstream in relation to the direction of rotation A of the roller 4, there is a narrow gap S between the roller 4 and the edge side 7 a gap of 0.05 to 0.15 mm. As a result, an enlarged free space is formed above the gap S, in which the glue is dammed up to form a glue supply before it is applied to the roller 4.
  • the glue is then transported away from the glue supply through the gap in a glue track 10 by the rotary movement of the roller 4.
  • the thickness and / or amount of the glue line 10 applied to the roller 4 is dependent on the gap width S of the gap, which is constant and should preferably be 0.05 to 0.15 mm.
  • the glue track 10 applied to the roller 4 is applied to the wrapping strip 1 moved in the opposite direction to form a glue seam 6.
  • the glue line 10 is actively rubbed open with the exertion of a slight pressure on the wrapping strip 1, whereby the quality of the glue seam 6 applied to the wrapping strip 1 can be considerably improved in terms of the width and thickness to be maintained.
  • the glue track 10 applied to the roller 4 through the gap is completely applied to the wrapping strip 1 so that the roller 4 has a blank, glue-free surface after it has run off the wrapping strip 1.
  • the thickness of the glue track 10 applied to the roller can also be changed by the speed of the roller 4, so that the glue track 10 and the glue seam 6 applied to the wrapping strip 1 in thickness and width very easily by changing the speed of the roller 4 can be adapted to the transport speed of the wrapping strip 1.
  • a glue seam 6 with a width of 1 mm could be applied from a nozzle without the use of a roller, while a glue seam 6 with a width of 2.5 mm could be applied with an identical amount of glue, nozzle and strand speed by using the roller 4.
  • the considerably wider glue seam 6 also had a considerably more constant thickness over the width, so that the glue penetration could be reduced and the adhesive strength could be increased through the improved utilization of the adhesive.
  • rollers 4 are provided on their outer surface with regularly arranged depressions in the form of annular ribs, in which the glue mass can be received.
  • the roller 4 is shaped with a plurality of ribs running in the circumferential direction and depressions arranged in between, so that the glue track 10 is transported away from the nozzle 2 in a thickness distribution predetermined by the shape of the roller 4. Due to the thickness distribution of the glue line 10, the glue seam 6 is again applied to the wrapping strip 1 with zones I running in the longitudinal direction of the wrapping strip 1 with a small glue thickness and zones II with a greater glue thickness.
  • the same effect can be achieved by applying the glue track 10 to the roller 4 either through a corresponding shape of the outlet opening 3, a small distance between the nozzle 2 and / or by selecting the amount of glue that emerges from the outlet opening 3 in a thickness distribution that differs over the cross section as can be seen in the lower right illustration.
  • the roller 4 can also be a shaft that is releasably clamped in a chuck, so that by exchanging the shafts, rollers 4 of different dimensions and different geometries can be used with very little effort.
  • the size of the glue supply 9 and the gap width between the roller 4 and the nozzle 2 can then be adjusted.
  • the speed of the roller 4 can also be used as a setting parameter, whereby the glue seam 6 can be adjusted by selecting the distance and the speed of the roller, in particular with regard to the viscosity, the transport speed of the wrapping strip 1 and the porosity of the wrapping strip 1 .
  • the solution according to the invention offers advantages in terms of avoiding so-called glue noses, so that the contamination and the effort required for cleaning the system can be reduced. This is also the case, in particular, when the seams of the cigarette and the seams of the wrapping strip 1 enclosing the tobacco fibers are bonded.
  • the invention can at least reduce the glue penetration of the glue seam 6 on the more highly porous covering strip 1 of the filter material.
  • the adhesive strength of the glue seam 6 can be increased if the glue seam 6 is formed from a cold glue seam which is cured on a heating bar.

Description

Die Erfindung betrifft eine Vorrichtung zum Auftragen einer Leimspur auf einen Umhüllungsstreifen eines stabförmigen Produktes der Tabak verarbeitenden Industrie mit den Merkmalen des Oberbegriffs von Anspruch 1. Das Dokument EP 0 755 636 A1 offenbart eine Vorrichtung mit den Merkmalen des Oberbegriffs von Anspruch 1.The invention relates to a device for applying a glue line to a wrapping strip of a rod-shaped product of the tobacco processing industry with the features of the preamble of claim 1. The document EP 0 755 636 A1 discloses an apparatus having the features of the preamble of claim 1.

Der Umhüllungsstreifen dient allgemein zur Formfixierung der stabförmigen Produkte, welche z.B. Vorprodukte, wie Filterstäbe oder Tabak, oder auch fertige Produkte, wie z.B. Zigaretten, Zigarillos, mit und ohne Filter sein können.The wrapping strip generally serves to fix the shape of the rod-shaped products, which e.g. Pre-products, such as filter rods or tobacco, or even finished products, such as Cigarettes, cigarillos, with and without filters.

Der Umhüllungsstreifen wird zuerst in einem kontinuierlichen Herstellungsprozess auf ein endloses Transportband umgelenkt und aufgelegt. Anschließend wird ein Filtermaterial aus losen Filtermaterialfasern, Filtersegmenten oder ein Strang von noch nicht fixierten Tabakfasern auf den Umhüllungsstreifen aufgelegt. Der Umhüllungsstreifen wird dann mit dem aufliegenden Strang durch einen Formgebungsabschnitt geführt, in dem der Umhüllungsstreifen seitlich des Stranges hochgeschlagen und an einer Randseite mit einer dünnen Leimspur versehen wird. Anschließend wird der Umhüllungsstreifen weiter um den Strang herumgeschlagen, bis sich die Ränder des Umhüllungsstreifens überlappen. Die Randseiten des Umhüllungsstreifens werden dann durch Ausüben einer geringen Andruckkraft und/oder thermischer Energie über die Leimnaht miteinander verklebt, so dass der Strang anschließend im Querschnitt durch den Umhüllungsstreifen formfixiert ist. Alternativ kann die Leimspur auch in Form von Leimpunkten mit einem bestimmten Abstand aufgetragen werden, was z.B. bei einem Anhaften der Filtersegmente bei einer Unterbeleimung der Fall ist. Die Leimpunkte und das Towmaterial werden in diesem Fall in der Mitte auf den Umhüllungsstreifen an einer Stelle weit vor dem Umschlagen des Umhüllungsstreifens aufgebracht, und dienen zu einer Vorfixierung der Filtersegmente an dem Umhüllungsstreifen. Grundsätzlich ist die Verwendung von Leimpunkten aber ein Sonderfall, normal ist sowohl bei Monofiltern (Tow) als auch bei Multifiltern (Segmente) die Verwendung einer Leimspur.The wrapping strip is first deflected and placed on an endless conveyor belt in a continuous manufacturing process. Then a filter material made of loose filter material fibers, filter segments or a strand of not yet fixed tobacco fibers is placed on the wrapping strip. The wrapping strip with the strand lying thereon is then passed through a shaping section in which the wrapping strip is turned up on the side of the strand and provided with a thin line of glue on one edge side. The wrapping strip is then further wrapped around the strand until the edges of the wrapping strip overlap. The edge sides of the wrapping strip are then glued to one another by exerting a slight pressure and / or thermal energy via the glue seam, so that the strand is then fixed in shape in cross section by the wrapping strip. Alternatively, the glue trail can also be in shape can be applied by glue dots with a certain distance, which is the case, for example, if the filter segments adhere to under-gluing. In this case, the glue dots and the tow material are applied to the center of the wrapping strip at a point far before the wrapping strip is turned over, and serve to pre-fix the filter segments on the wrapping strip. Basically, the use of glue dots is a special case; it is normal to use a glue track for both monofilters (tow) and multifilters (segments).

Zum Auftragen der Leimspur ist eine Düse mit einem runden Öffnungsquerschnitt mit einem Durchmesser von z.B. 1,6 mm vorgesehen, über die der Leim kontinuierlich z.B. mit einer Zahnradpumpe in einem von dieser vorgegebenen Volumen aufgetragen wird. Das aufgetragene Leimvolumen kann in diesem Fall z.B. durch eine Drehzahlsteuerung der Zahnradpumpe gesteuert werden. Dadurch ergibt sich in Abhängigkeit von dem von der Zahnradpumpe erzeugten Volumen eine Leimauftragsmenge von ca. (3-8g)/600m Stranglänge für die Fixierung des den Tabak fixierenden Umhüllungsstreifens und eine Leimauftragsmenge von ca. 10 bis 30 g/600m Stranglänge für die Fixierung eines Umhüllungsstreifens eines Filterstranges, wobei die Stranggeschwindigkeit ca. 200 bis über 600 m/min beträgt. Es wurden aber in Ausnahmefällen auch schon Anlagen mit einer Stranggeschwindigkeit von mehr als 600 m/min, wie z.B. 700 m/min oder mehr, realisiert, und es ist nicht auszuschließen, dass zur Reduzierung der Herstellkosten die Stranggeschwindigkeit grundsätzlich noch weiter gesteigert wird.To apply the glue line, a nozzle with a round opening cross-section with a diameter of e.g. 1.6 mm is provided, over which the glue is continuously e.g. is applied with a gear pump in a predetermined volume. The volume of glue applied can in this case e.g. can be controlled by a speed control of the gear pump. Depending on the volume generated by the gear pump, this results in a glue application amount of approx. (3-8g) / 600m strand length for the fixation of the wrapping strip that fixes the tobacco and a glue application amount of approx. 10 to 30 g / 600m strand length for the fixation of one Wrapping strip of a filter rod, the rod speed being approx. 200 to over 600 m / min. In exceptional cases, however, systems with a line speed of more than 600 m / min, such as 700 m / min or more, and it cannot be ruled out that, in order to reduce the manufacturing costs, the strand speed is fundamentally increased even further.

Ein Nachteil der oben beschriebenen Lösung ist darin zu sehen, dass der Leim aufgrund der Reibung an der Innenwandung der Düse über den Querschnitt verteilt ungleichmäßig aus der Düse austritt. Die Leimaustrittsgeschwindigkeit ist dadurch und aufgrund der vorherrschenden laminaren Strömung in der Mitte der Düsenöffnung deutlich größer als in dem Randabschnitt der Düsenöffnung und weist einen parabelförmigen Verlauf über den Querschnitt auf. Da zur Schaffung einer Leimspur mit einer bestimmten Breite eine bestimmte Mindestmenge an Leim über die gesamte Breite der Leimspur aufgetragen werden muss, und die Leimaustrittsgeschwindigkeit in der Mitte der Düsenöffnung aufgrund der oben beschriebenen Problematik zwangsläufig höher als in der Randzone ist, wird der Leim in der Mitte der Düsenöffnung im Vergleich zu der eigentlich erforderlichen Leimmenge pro Fläche in einer überhöhten Menge aufgetragen. Ferner ist die Zeitspanne, in der der Umhüllungsstreifen an den parallel zu der Transportrichtung gerichteten Randabschnitten der Düsenöffnung vorbeigeführt wird, aufgrund der Kreisform der Austrittsöffnung der Düse deutlich geringer als die Zeitspanne, in der der Umhüllungsstreifen an dem Mittenabschnitt der Austrittsöffnung vorbeigeführt wird. Beide Umstände führen im Ergebnis dazu, dass in der Mitte der Leimspur deutlich mehr Leim als in den Randabschnitten aufgetragen wird. Grundsätzlich ist es aber wünschenswert, den Leim für eine Leimspur mit einer großen Klebkraft möglichst gleichmäßig aufzutragen, wobei eine vorgegebene Mindestmenge an Leim nicht unterschritten werden sollte.A disadvantage of the solution described above can be seen in the fact that the glue is unevenly distributed over the cross section from the nozzle due to the friction on the inner wall of the nozzle exit. As a result of this and due to the prevailing laminar flow, the glue outlet speed in the center of the nozzle opening is significantly greater than in the edge section of the nozzle opening and has a parabolic course over the cross section. Since a certain minimum amount of glue must be applied over the entire width of the glue line to create a glue line with a certain width, and the glue exit speed in the middle of the nozzle opening is necessarily higher than in the edge zone due to the problems described above, the glue in the Applied in an excessive amount in the middle of the nozzle opening compared to the actually required amount of glue per area. Furthermore, due to the circular shape of the outlet opening of the nozzle, the time span in which the wrapping strip is guided past the edge sections of the nozzle opening that are parallel to the transport direction is significantly shorter than the time span in which the wrapping strip is guided past the central section of the outlet opening. As a result, both of these circumstances mean that significantly more glue is applied in the middle of the glue line than in the edge sections. In principle, however, it is desirable to apply the glue for a glue track with a high bond strength as evenly as possible, with the amount of glue not falling below a predetermined minimum amount.

Aufgrund der Überhöhung der Leimaustrittsgeschwindigkeit und damit auch der Leimmenge in der Mitte der Austrittsöffnung der Düse tritt der Leim in der Mitte der Austrittsöffnung zu einem größeren Anteil durch den porösen Umhüllungsstreifen hindurch, ohne zur Verklebung der Ränder des Umhüllungsstreifens beizutragen. Dieser Effekt wird auch als Leimdurchschlag bezeichnet. Der Leimdurchschlag steht in Abhängigkeit zu der Porosität des Umhüllungsstreifens und nimmt mit dieser zu. Neben einer unerwünschten möglichen geschmacklichen Veränderung der Produkte führt der Leimdurchschlag zu einer unerwünschten Verschmutzung der gesamten Vorrichtung bzw. Anlage und der nachfolgenden Produkte. Durch den Leimdurchschlag wird die Klebkraft zusätzlich zu der Reduzierung der Klebkraft aufgrund der unterschiedlichen Verteilung weiter verringert.Due to the excess of the glue exit speed and thus also the amount of glue in the middle of the exit opening of the nozzle, a larger proportion of the glue in the center of the exit opening passes through the porous wrapping strip without contributing to the gluing of the edges of the wrapping strip. This effect is also known as glue penetration. The glue penetration depends on the porosity of the covering strip and increases with it. In addition to a undesired possible change in taste of the products, the glue penetration leads to undesired contamination of the entire device or system and the subsequent products. As a result of the glue penetration, the bond strength is further reduced in addition to the reduction in bond strength due to the different distribution.

Da das Filtermaterial außerdem bei der Strangherstellung stark komprimiert wird und erst durch das Trocknen des aufgebrachten Acetats vernetzt in sich formstabilisiert wird, übt das Filtermaterial zum Zeitpunkt des Verklebens noch eine verhältnismäßig hohe Rückstellkraft aus. Aus diesem Grund wird auf den Umhüllungsstreifen eine Heißleimnaht mit einer hohen sofort wirksamen Klebkraft aufgetragen. Da der Heißleim aber nicht alterungsbeständig ist, und die Filter nicht in jedem Fall zeitnah weiterverarbeitet werden, kann die Verklebung der Ränder optional durch eine zweite, auch als Unterstützungsnaht bezeichnete, parallel zu der Heißleimnaht verlaufende Kaltleimnaht stabilisiert werden. In Zigarettenmaschinen wird der Umhüllungsstreifen zum Aushärten der Kaltleimnaht mit einem möglichst geringen Andruck an einem Heizsteg vorbeigeführt, während bei Filtermaschinen in der Regel nur die Heißleimnaht während des Produktionsprozesses durch einen Kühlsteg ausgehärtet wird. Die bei der Filtermaschine vorgesehene optionale Kaltleimnaht härtet im Gegensatz zu der Zigarettenherstellung ohne eine thermische Energiezufuhr aus. Grundsätzlich kann die überschüssige Leimmasse sowohl den Aushärtungsprozess als auch die Führung des Umhüllungsstreifens als solches nachteilig beeinflussen.Since the filter material is also strongly compressed during the production of the strand and is only stabilized in cross-linked form by the drying of the applied acetate, the filter material still exerts a relatively high restoring force at the time of gluing. For this reason, a hot glue seam with a high adhesive force that is immediately effective is applied to the wrapping strip. However, since the hot glue is not resistant to aging and the filters are not processed further in any case, the gluing of the edges can optionally be stabilized by a second cold glue seam, also known as a support seam, running parallel to the hot glue seam. In cigarette machines, the wrapping strip for curing the cold glue seam is guided past a heating bar with as little pressure as possible, while in filter machines usually only the hot glue seam is hardened by a cooling bar during the production process. The optional cold glue seam provided for the filter machine hardens in contrast to cigarette production without a thermal energy supply. In principle, the excess glue mass can adversely affect both the curing process and the guidance of the wrapping strip as such.

Die Kaltleimspur und die Heißleimspur werden parallel auf einem sehr schmalen Randabschnitt des Umhüllungsstreifens des Filters aufgebracht. Aufgrund des sehr schmalen Randstreifens müssen die Leimspuren mit einer möglichst geringen Formabweichung von einem vorgegebenen Verlauf und einer vorgegebenen Breite aufgetragen werden.The cold glue line and the hot glue line are applied in parallel on a very narrow edge section of the wrapping strip of the filter. Because of the very narrow marginal strip the glue traces must be applied with the smallest possible deviation in shape from a given course and a given width.

Die Verklebung des Filterstranges über die zwei parallel ausgerichteten Leimspuren bereitet daher erhebliche konstruktive Probleme und ist darüber hinaus sehr kostenintensiv.The gluing of the filter rod via the two parallel lines of glue therefore causes considerable structural problems and is also very cost-intensive.

Zur Verbesserung der Klebkraft ist es aus der EP 1 002 468 A2 bekannt, die Leimspur in Form eines Schaumes aufzutragen, welcher dadurch gebildet wird, indem der flüssige Leim mit Gasbläschen, insbesondere mit Inertgas- oder Luftbläschen, versetzt wird.To improve the bond strength it is from the EP 1 002 468 A2 known to apply the glue track in the form of a foam, which is formed by adding gas bubbles, in particular inert gas or air bubbles, to the liquid glue.

Vor diesem Hintergrund liegt der Erfindung die Aufgabe zugrunde, eine gattungsgemäße Vorrichtung bereitzustellen, mit der eine Leimspur mit einer möglichst großen Klebkraft mit einer gleichzeitig möglichst geringen Verschmutzung des Umhüllungsstreifens und der Vorrichtung bzw. der Umgebung möglich ist.Against this background, the invention is based on the object of providing a generic device with which a glue line with the greatest possible adhesive force with at the same time the least possible contamination of the wrapping strip and the device or the environment is possible.

Zur Lösung der Aufgabe wird eine Vorrichtung mit den Merkmalen des Anspruchs 1 vorgeschlagen. Weitere bevorzugte Weiterentwicklungen der Erfindung sind den Unteransprüchen, den Figuren und der zugehörigen Beschreibung zu entnehmen.To achieve the object, a device with the features of claim 1 is proposed. Further preferred developments of the invention can be found in the subclaims, the figures and the associated description.

Gemäß dem Grundgedanken der Erfindung wird vorgeschlagen, dass zwischen dem Umhüllungsstreifen und der Austrittsöffnung der Düse eine rotatorisch angetriebene Walze vorgesehen ist, auf welche der aus der Austrittsöffnung austretende Leim aufgetragen wird, und welche den Leim unmittelbar auf den Umhüllungsstreifen aufträgt, wobei die Drehrichtung der Walze so gerichtet ist, dass die Bewegung der Walze an der Seite, welche dem vorbeibewegten Umhüllungsstreifen zugewandt ist, entgegengesetzt zu der Bewegung des Umhüllungsstreifens gerichtet ist.According to the basic idea of the invention, it is proposed that a rotationally driven roller is provided between the wrapping strip and the outlet opening of the nozzle, to which the glue emerging from the outlet opening is applied and which applies the glue directly to the wrapping strip, the direction of rotation of the roller is directed so that the movement of the roller on the side facing the facing the wrapping strip moved by, is directed opposite to the movement of the wrapping strip.

Der Vorteil der vorgeschlagenen Lösung ist darin zu sehen, dass der aus der Austrittsöffnung austretende Leim auf der Walze zunächst auf eine konstante Breite, mit einer nahezu konstanten Dicke verrieben wird. Die Leimspur wird dann von der Walze unmittelbar auf den Umhüllungsstreifen aufgetragen, bzw. unmittelbar von dem Umhüllungsstreifen von der Walze abtransportiert. Auf der Walze entsteht dabei ein Leimring, während der Leim über die Austrittsöffnung kontinuierlich nachgeführt wird. Dabei ist die entgegengesetzt gerichtete Bewegung der Walze zu dem Umhüllungsstreifen beim Auftragen der Leimspur von besonderer Bedeutung, da die Leimspur dadurch praktisch auf dem Umhüllungsstreifen verrieben wird. Dadurch kann eine Leimspur mit einer konstanten Breite bis zu einer Stranggeschwindigkeit des Umhüllungsstreifens von 600 m/min und darüber hinaus erzielt werden. Durch das Verreiben des Leims auf dem Umhüllungsstreifen kann ferner ein erheblich verbesserter Verbund aus Fasern und Leim erzielt werden, welcher im Ergebnis anschließend zu einer wesentlich größeren Klebkraft der Leimnaht führt. In Versuchen konnte die Klebkraft dadurch bis über 300 % der bisherigen Klebkraft gesteigert werden. Dies ist darauf zurückzuführen, dass der Leim erheblich effektiver zur Verklebung der beiden Lagen des Umhüllungsstreifens ausgenutzt wird, und dadurch ein geringerer Anteil an überschüssigem Leim entsteht. Dadurch kann auch der Effekt von bei Beleimungsvorrichtungen auftretenden Leimnasen nahezu vollständig vermieden werden, so dass die Vorrichtung weniger verschmutzt. Vielmehr wird die Walze aufgrund der Richtung der Drehbewegung in dem Umfangsabschnitt, in dem die Walze von dem Umhüllungsstreifen abhebt, wieder sauber gerieben, so dass sich die Vorrichtung praktisch selbstständig reinigt.The advantage of the proposed solution can be seen in the fact that the glue emerging from the outlet opening is first rubbed on the roller to a constant width, with an almost constant thickness. The glue line is then applied directly to the wrapping strip by the roller or is transported away from the roller directly by the wrapping strip. A ring of glue is created on the roller while the glue is continuously fed through the outlet opening. The movement of the roller in the opposite direction to the wrapping strip when applying the glue line is of particular importance, since the glue line is practically rubbed on the wrapping strip. As a result, a glue line with a constant width can be achieved up to a strand speed of the wrapping strip of 600 m / min and beyond. By rubbing the glue on the wrapping strip, a considerably improved composite of fibers and glue can also be achieved, which subsequently leads to a considerably greater adhesive strength of the glue seam. In tests, the bond strength could thereby be increased to over 300% of the previous bond strength. This is due to the fact that the glue is used considerably more effectively for gluing the two layers of the wrapping strip, and this results in a lower proportion of excess glue. As a result, the effect of glue protrusions occurring in gluing devices can be almost completely avoided, so that the device is less soiled. Rather, due to the direction of the rotary movement, the roller is rubbed clean again in the circumferential section in which the roller lifts off the wrapping strip, so that the device practically cleans itself.

Weiter wird vorgeschlagen, dass die Drehzahl der Walze veränderbar ist. Durch die vorgeschlagene Weiterentwicklung wird ein neuer Parameter geschaffen, mit Hilfe dessen die Breite der Leimspur verändert werden kann. Damit kann die Leimspurbreite nach einem Formatwechsel der Anlage zur Herstellung von Produkten mit anderen Abmessungen sehr einfach an das neue Produkt angepasst werden, ohne dass dazu Teile ausgetauscht werden müssen.It is also proposed that the speed of the roller can be changed. The proposed further development creates a new parameter with the help of which the width of the glue line can be changed. This means that the glue line width can be adapted very easily to the new product after a format change in the system for manufacturing products with different dimensions, without having to replace parts.

Dabei konnten besonders gute Ergebnisse erzielt werden, wenn die Walze einen Durchmesser von 2 bis 12 mm aufweist und mit einer Drehzahl von 1000U/min bis 12000 U/min angetrieben wird, woraus sich Umfangsgeschwindigkeiten von 50 bis 150 m/min ergeben.Particularly good results could be achieved when the roller has a diameter of 2 to 12 mm and is driven at a speed of 1000 rpm to 12000 rpm, resulting in peripheral speeds of 50 to 150 m / min.

Ferner konnten ein besonders gleichmäßiger Leimauftrag und eine hohe Klebkraft dadurch erzielt werden, wenn der Abstand zwischen der Walze und der Austrittsöffnung der Düse ca. 0,05 mm bis 0,15 mm beträgt.In addition, it was possible to achieve a particularly uniform application of glue and a high bond strength if the distance between the roller and the outlet opening of the nozzle is approximately 0.05 mm to 0.15 mm.

Weiter können wenigstens zwei in Axialrichtung der Walze hintereinander angeordnete Austrittsöffnungen vorgesehen sein, aus denen der Leim auf die Walze aufgetragen wird. Dadurch kann die Leimspur bei einer gleichzeitig sehr hohen gleichmäßigen Verteilung verbreitert werden. Ferner können dadurch auch zwei parallele Leimspuren auf den Umhüllungsstreifen aufgebracht werden.Furthermore, at least two outlet openings arranged one behind the other in the axial direction of the roller can be provided, from which the glue is applied to the roller. As a result, the glue line can be widened with a very high uniform distribution at the same time. Furthermore, two parallel glue lines can be applied to the wrapping strip.

Die Erfindung kann besonders kostengünstig verwirklicht werden, wenn die Walze durch eine von einem Elektromotor angetriebene Welle gebildet ist. Außerdem ergibt sich dadurch eine Vorrichtung mit einem besonders einfachen konstruktiven Aufbau. Da die Walze lediglich einen freien Abschnitt zum Auftragen des Leimes aufweisen muss, besteht die einzige konstruktive Anforderung darin, dass die Welle in einem kurzen Stück frei zugänglich sein muss.The invention can be implemented particularly cost-effectively if the roller is formed by a shaft driven by an electric motor. In addition, this results in a device with a particularly simple structural design. Since the roller only needs to have a free section for applying the glue, the only structural requirement is that the shaft must be freely accessible in a short piece.

Ferner ist es von Vorteil, wenn der Bereich, in dem der Leim auf die Walze aufgetragen wird, und der Bereich, in dem der Leim von der Walze auf den Umhüllungsstreifen aufgebracht wird gegenüberliegend an der Walze angeordnet sind. Dadurch wird der Leim nach dem Auftragen auf die Walze in einem Umfangsabschnitt von ca. 180 Grad auf der Walze verteilt, bevor er auf dem Umhüllungsstreifen aufgetragen wird bzw. von dem Umhüllungsstreifen abtransportiert wird. Die Walze befindet sich praktisch zwischen dem Umhüllungsstreifen und der Düse.It is also advantageous if the area in which the glue is applied to the roller and the area in which the glue is applied from the roller to the wrapping strip are arranged opposite one another on the roller. As a result, after being applied to the roller, the glue is distributed over a circumferential section of approximately 180 degrees on the roller before it is applied to the wrapping strip or is transported away from the wrapping strip. The roller is practically between the wrapping strip and the nozzle.

Dabei konnten besonders gute Ergebnisse hinsichtlich der Verbesserung der Klebkraft der Leimnaht gegenüber der im Stand der Technik verwendeten Leimnaht erzielt werden, wenn der Leim eine Viskosität von wenigstens 180 mPas aufweist. Grundsätzlich ist das Auftragen von hochviskosen Leimen mit einer höheren Viskosität als 180 mPas mit einer konstanten Breite bei einem direkten Auftragen der Leimspur problematisch. Durch das Auftragen des hochviskosen Leims mit der vorgeschlagenen Lösung über die Walze auf den Umhüllungsstreifen kann die konstante Breite der Leimspur aber erheblich einfacher erreicht werden, da der Leim trotz seiner hohen Viskosität durch das Auftragen auf die Walze zunächst auf eine bestimmte Breite verteilt wird und erst dann auf den Umhüllungsstreifen aufgetragen wird.It was possible to achieve particularly good results with regard to the improvement in the bond strength of the glue seam compared to the glue seam used in the prior art if the glue has a viscosity of at least 180 mPas. Basically, the application of highly viscous glues with a viscosity higher than 180 mPas with a constant width is problematic when the glue track is applied directly. However, by applying the highly viscous glue with the proposed solution over the roller to the wrapping strip, the constant width of the glue track can be achieved much more easily, since the glue is first distributed over a certain width by applying it to the roller, despite its high viscosity then applied to the wrapping strip.

Dabei konnte eine Leimnaht mit einer ausreichend hohen Klebkraft verwirklicht werden, indem der Leim in einer Menge von 5g bis 40g pro 500 m Länge des Umhüllungsstreifens aufgetragen wird.A glue seam with a sufficiently high bond strength could be achieved by applying the glue in an amount of 5g to 40g is applied per 500 m length of the wrapping strip.

Ferner konnte durch die erfindungsgemäße Lösung eine Leimnaht mit einer sehr guten Klebkraft verwirklicht werden, wenn die Transportgeschwindigkeit des Umhüllungsstreifens zwischen 100 m/min und 700 m/min beträgt.Furthermore, the solution according to the invention made it possible to produce a glue seam with very good adhesive strength when the transport speed of the wrapping strip is between 100 m / min and 700 m / min.

Weiter wird vorgeschlagen, dass die Walze exzentrisch zu der Austrittsöffnung der Düse angeordnet ist. Durch die exzentrische Anordnung der Walze wird bewusst an einer Seite der Walze ein größerer Freiraum zwischen der Austrittsöffnung der Düse und der Walze geschaffen, in dem der austretende Leim zunächst in einem Leimreservoir aufgestaut wird, bevor er durch die Drehbewegung der Walze abtransportiert wird. Durch das Leimreservoir wird das Auftragen des Leimes auf die Walze praktisch vergleichmäßigt, wodurch die Qualität der Leimnaht weiter verbessert wird. Je nach der Viskosität des Leimes und der Geometrie der Leimnaht kann das Leimreservoir durch die Bemessung der Exzentrizität, der Spaltweite, der Menge des zuströmenden Leimes und der Drehzahl der Walze größer oder kleiner bemessen werden.It is further proposed that the roller is arranged eccentrically to the outlet opening of the nozzle. The eccentric arrangement of the roller deliberately creates a larger free space on one side of the roller between the outlet opening of the nozzle and the roller, in which the emerging glue is first dammed up in a glue reservoir before it is transported away by the rotary movement of the roller. The glue reservoir practically even out the application of the glue to the roller, which further improves the quality of the glue seam. Depending on the viscosity of the glue and the geometry of the glue seam, the glue reservoir can be made larger or smaller by dimensioning the eccentricity, the gap width, the amount of the inflowing glue and the speed of the roller.

Dabei ist die Walze bevorzugt in Richtung der Kante der Austrittsöffnung der Düse exzentrisch versetzt, welche in Bezug zu der Drehrichtung der Walze stromabwärts angeordnet ist. Der Leim wird dadurch durch einen verengten Spalt zwischen der Walze und dem Rand der Austrittsöffnung aus dem Leimreservoir auf die Walze aufgetragen, wodurch die Dicke der auf die Walze aufgetragenen Leimspur auf ein Maximum begrenzt wird.The roller is preferably offset eccentrically in the direction of the edge of the outlet opening of the nozzle, which is arranged downstream in relation to the direction of rotation of the roller. The glue is thereby applied to the roller through a narrowed gap between the roller and the edge of the outlet opening from the glue reservoir, whereby the thickness of the glue line applied to the roller is limited to a maximum.

Ferner ist die in Bezug zu der Drehrichtung der Walze stromabwärts angeordnete Randseite der Austrittsöffnung in Richtung der Walze vorstehend geformt, wodurch die Spaltweite zwischen der Walze und der Düse an der Seite, an der die Leimmasse auf die Walze aufgetragen wird, weiter verringert wird, wodurch wiederum die Qualität der Leimspur auf der Walze und damit auch die Qualität der Leimnaht auf dem Umhüllungsstreifen verbessert wird.Furthermore, the edge side of the outlet opening which is arranged downstream in relation to the direction of rotation of the roller is in the direction The roller is shaped above, whereby the gap between the roller and the nozzle on the side on which the glue is applied to the roller, is further reduced, which in turn the quality of the glue line on the roller and thus the quality of the glue seam on the Wrapping strip is improved.

Die Erfindung wird im Folgenden anhand einer bevorzugten Ausführungsform unter Bezugnahme auf die beigefügten Figuren erläutert. Dabei zeigen:

Fig. 1:
eine erfindungsgemäße Vorrichtung mit einer Düse und einem Umhüllungsstreifen, und
Fig. 2:
eine vergrößerte Darstellung der Austrittsöffnung der Düse mit einer exzentrisch dazu angeordneten Walze, und
Fig. 3:
verschiedenen Geometrien der Walze und der Düse zum Auftragen von Leimnähten mit einer unterschiedlichen Formgebung.
The invention is explained below on the basis of a preferred embodiment with reference to the attached figures. Show:
Fig. 1:
a device according to the invention with a nozzle and a wrapping strip, and
Fig. 2:
an enlarged view of the outlet opening of the nozzle with a roller arranged eccentrically thereto, and
Fig. 3:
different geometries of the roller and the nozzle for applying glue seams with a different shape.

In der Figur 1 ist eine erfindungsgemäße Vorrichtung mit einer maschinenfest gehaltenen Düse 2 mit einer Austrittsöffnung 3 und einer an der Austrittsöffnung 3 angeordneten rotatorisch angetriebenen Walze 4 zu erkennen. Die Walze 4 ist in diesem Fall das Ende einer aus einem Elektromotor 5 heraus geführten Welle, und wird in Pfeilrichtung A rotatorisch angetrieben.In the Figure 1 a device according to the invention with a nozzle 2, held fixed to the machine, with an outlet opening 3 and a rotatably driven roller 4 arranged at outlet opening 3 can be seen. The roller 4 is in this case the end of a shaft guided out of an electric motor 5 and is driven to rotate in the direction of arrow A.

Der Elektromotor 5 ist genauso wie die Düse 2 maschinenfest gehalten und kann daher zusammen mit der Walze 4 (der heraus geführten Welle) als feststehend angesehen werden. Ferner ist ein endloser Umhüllungsstreifen 1 zu erkennen, welcher mittels einer nicht dargestellten Transporteinrichtung in Pfeilrichtung B mit einer Transportgeschwindigkeit von 100 m/min bis zu 700 m/min, bevorzugt von 600 m/min transportiert wird. Die Walze 4 ist zwischen dem Umhüllungsstreifen 1 und der Austrittsöffnung 3 der Düse 2 angeordnet, also gegenüberliegend zu dem Umfangsabschnitt der Walze 4 angeordnet, in dem die Walze 4 zur Anlage an dem Umhüllungsstreifen 1 gelangt. Dabei wird unter dem Begriff feststehend auch eine Walze 4 oder eine Düse 2 angesehen, welche während des Leimauftrages oder vor dem Leimauftrag mit der Drehachse geringfügige Bewegungen zu dem Umhüllungsstreifen 1 oder zueinander ausführen können, wodurch die Ausrichtung der Walze 4 und der Düse 2 zueinander und zu dem Umhüllungsstreifen 1 geringfügig variieren bzw. eingestellt werden kann. Wichtig bei der Interpretation des Begriffs "feststehend" ist lediglich, dass die Auftragsbewegung der Leimspur auf den Umhüllungsstreifen 1 durch das Vorbeibewegen des Umhüllungsstreifens 1 an der Walze 4 bzw. gegenüber der Düse 2 erfolgt. Die Leimspur wird praktisch von der Walze 4 durch die Bewegung des Umhüllungsstreifens 1 abtransportiert, wobei die möglichen geringfügigen Bewegungen der Walze 4 oder der Düse 2 zur Einstellung der Ausrichtung und/oder während des Auftragens der Leimspur als für die Auftragsbewegung der Leimspur zu vernachlässigen anzusehen sind.The electric motor 5, like the nozzle 2, is held fixed to the machine and can therefore be regarded as being stationary together with the roller 4 (the shaft that is led out). Furthermore, an endless wrapping strip 1 can be seen, which by means of a transport device (not shown) in the direction of the arrow B is transported at a transport speed of 100 m / min up to 700 m / min, preferably 600 m / min. The roller 4 is arranged between the wrapping strip 1 and the outlet opening 3 of the nozzle 2, that is, it is arranged opposite the peripheral section of the roller 4 in which the roller 4 comes to rest on the wrapping strip 1. The term stationary also includes a roller 4 or a nozzle 2, which during the application of glue or before the application of glue can perform slight movements with the axis of rotation to the wrapping strip 1 or to one another, whereby the alignment of the roller 4 and the nozzle 2 to one another and to the wrapping strip 1 can vary or be adjusted slightly. When interpreting the term “fixed”, it is only important that the application movement of the glue track on the wrapping strip 1 occurs as the wrapping strip 1 moves past the roller 4 or opposite the nozzle 2. The glue line is practically transported away from the roller 4 by the movement of the wrapping strip 1, the possible slight movements of the roller 4 or the nozzle 2 for setting the alignment and / or during the application of the glue line being negligible for the application movement of the glue line .

Die Walze 4 wird in der Darstellung im Uhrzeigersinn in Pfeilrichtung A angetrieben, so dass die Walze 4 in dem Abschnitt, welcher dem Umhüllungsstreifen 1 gegenüberliegt bzw. in dem Abschnitt, in dem sie an dem Umhüllungstreifen 1 zur Anlage gelangt, sich entgegen der Transportrichtung des Umhüllungsstreifens 1 bewegt. Der aus der Austrittsöffnung 3 der Düse 2 austretende Leim wird dadurch im Uhrzeigersinn von der Walze 4 abtransportiert und in Form einer Leimspur 6 mit einer konstanten Breite auf den Umhüllungsstreifen 1 aufgetragen. Dabei wird der Leim in einer Menge von 5 g bis 40 g je 500 Meter Länge des Umhüllungsstreifens 1 aufgetragen. Nach dem Auftragen der Leimspur 6 auf den Umhüllungsstreifen 1 wird die Walze 4 in der von dem Umhüllungsstreifen 1 ablaufenden Bewegung wieder gereinigt, was auch dadurch zu erkennen ist, da die Schichtdicke des auf der Walze 4 befindlichen Leims in diesem Abschnitt erheblich dünner ist. Dadurch kann die bisher auftretende sogenannte "Leimnase" an der Düse 2 vermieden werden.The roller 4 is driven clockwise in the illustration in the direction of arrow A, so that the roller 4 in the section which lies opposite the wrapping strip 1 or in the section in which it comes to rest on the wrapping strip 1, is opposite to the transport direction of the Wrapping strip 1 moved. The glue emerging from the outlet opening 3 of the nozzle 2 is thereby transported away from the roller 4 in a clockwise direction and applied to the wrapping strip 1 in the form of a glue track 6 with a constant width. The glue is used in an amount of 5 g to 40 g per 500 meters Length of the wrapping strip 1 applied. After the glue line 6 has been applied to the wrapping strip 1, the roller 4 is cleaned again in the movement running off the wrapping strip 1, which can also be seen because the layer thickness of the glue on the roller 4 is considerably thinner in this section. As a result, the so-called "glue nose" that has previously occurred on the nozzle 2 can be avoided.

Außerdem wird der Leim durch das Verreiben auf dem Umhüllungsstreifen 1 erheblich gleichmäßiger hinsichtlich der Breite und der Dicke der Leimspur aufgetragen, als dies mit der bisher verwendeten Lösung des direkten Auftragens der Leimspur über die Düse 2 möglich war, so dass anschließend nach dem Verkleben der Lagen des Umhüllungsstreifens 1 eine erheblich festere Leimnaht mit einer größeren Klebkraft vorliegt. Die größere Klebkraft wird dadurch erzielt, indem der Leim vollständig zu einer Verbundschicht zwischen die Fasern des Umhüllungsstreifens 1 für die Verklebung genutzt wird. Dadurch entsteht beim anschließenden Verkleben der Lagen eine möglichst homogene Verbundschicht von Fasern der miteinander verklebten Lagen des Umhüllungsstreifens 1 mit dazwischen eingelagerten Leimanteilen. Diese homogene Verbundschicht führt zu einer erhöhten Klebkraft, da eine ausschließlich aus Leim bestehende Schicht mit einer erfahrungsgemäß geringeren Klebkraft nicht mehr vorhanden ist. In diesem Fall führt die Verwendung von weniger Leim zu einer höheren Klebkraft und zu einer geringeren Verschmutzung der Maschine. Für den Fall, dass die Leimnaht aus Kaltleim mit einer ausschließlich aus Leim bestehenden Schicht gebildet ist, welche anschließend an einem Heizsteg vorbeigeführt und ausgehärtet wird, besteht außerdem die Gefahr, dass das Wasser in der Leimmasse beim Aushärten an dem Heizsteg in der Leimmasse verdampft und dadurch kleine Hohlräume bildet. Diese Hohlräume bilden dann jeweils Unterbrechungen der Klebenaht und verringern die Klebkraft, indem die Klebenaht unter Belastung in einer durch die Hohlräume verlaufenden Aufreißlinie aufreißt. Da durch die erfindungsgemäße Lösung die Leimnaht sehr viel kontrollierter aufgetragen wird und dadurch eine ausschließlich aus Leimmasse bestehende Schicht in der Klebenaht vermieden werden kann, kann die Klebkraft im Ergebnis durch die erfindungsgemäße Lösung erhöht werden.In addition, the glue is applied by rubbing on the wrapping strip 1 much more evenly in terms of width and thickness of the glue line than was possible with the previously used solution of direct application of the glue line via the nozzle 2, so that after the gluing of the layers of the wrapping strip 1 has a considerably stronger glue seam with a greater adhesive strength. The greater adhesive strength is achieved in that the glue is used completely to form a composite layer between the fibers of the wrapping strip 1 for bonding. As a result, when the layers are subsequently glued together, the most homogeneous possible composite layer of fibers of the layers of the wrapping strip 1 that is glued to one another is produced with portions of glue sandwiched between them. This homogeneous composite layer leads to an increased bond strength, since a layer consisting exclusively of glue with a lower bond strength according to experience is no longer present. In this case, using less glue leads to a higher bond strength and less pollution of the machine. In the event that the glue seam is formed from cold glue with a layer consisting exclusively of glue, which is then led past a heating bar and cured, there is also the risk that the water in the glue mass will evaporate and harden on the heating bar in the glue mass thereby forming small cavities. These cavities then each form interruptions in the adhesive seam and reduce the adhesive strength by the adhesive seam tearing under load in a tear line running through the cavities. Since the glue seam is applied in a much more controlled manner with the solution according to the invention and a layer consisting exclusively of glue mass can be avoided in the glue seam, the adhesive strength can be increased as a result by the solution according to the invention.

Insbesondere konnte durch die erfindungsgemäße Lösung eine sehr gleichmäßige Leimnaht mit einer im Wesentlichen konstanten Dicke und einer gleichbleibend hohen Klebkraft auch bei sehr hohen Stranggeschwindigkeiten erzielt werden. Dies liegt daran, dass die Leimnaht durch das Auftragen auf die Walze 4 vor dem Auftragen auf den Umhüllungsstreifen 1 zunächst auf eine größere Breite mit einer konstanteren Dicke verrieben wird, und erst dann von der Walze 4 auf den Umhüllungsstreifen 1 aufgetragen wird.In particular, the solution according to the invention made it possible to achieve a very uniform glue seam with a substantially constant thickness and a consistently high bond strength even at very high strand speeds. This is due to the fact that the glue seam is first rubbed over a larger width with a more constant thickness by being applied to the roller 4 before it is applied to the wrapping strip 1, and only then is applied to the wrapping strip 1 by the roller 4.

In der Figur 2 ist ein vergrößerter Ausschnitt der Düse 2 mit der vor der Austrittsöffnung 3 angeordneten Walze 4 zu erkennen. Der Umhüllungsstreifen 1 wird an der gegenüberliegenden Seite der Walze 4 geringfügig umgelenkt und liegt dadurch mit einer geringen Vorspannung an der Walze 4 an.In the Figure 2 an enlarged section of the nozzle 2 with the roller 4 arranged in front of the outlet opening 3 can be seen. The wrapping strip 1 is slightly deflected on the opposite side of the roller 4 and thus lies against the roller 4 with a slight pretension.

Die Düse 2 ist an dem die Austrittsöffnung 3 begrenzenden Rand so geformt, dass die in der Darstellung untere Randseite 7 in Richtung der Walze 4 vorstehend ausgebildet ist. Gleichzeitig ist die Walze 4 exzentrisch angeordnet, d.h. die Drehachse der Walze 4 ist um das Maß E unterhalb der Mitte M der Austrittsöffnung 3 angeordnet. Durch die exzentrische Anordnung der Walze 4 und der in Bezug zu der Drehrichtung A der Walze 4 stromabwärts angeordneten vorstehenden Randseite 7 ist zwischen der Walze 4 und der Randseite 7 eine enger Spalt S mit einer Spaltweite von 0,05 bis 0,15 mm gebildet. Oberhalb des Spaltes S ist dadurch ein vergrößerter Freiraum gebildet, in dem der Leim vor dem Auftragen auf die Walze 4 zu einem Leimvorrat aufgestaut wird. Der Leim wird dann durch die Drehbewegung der Walze 4 aus dem Leimvorrat durch den Spalt in einer Leimspur 10 abtransportiert. Die Dicke und/oder Menge der auf der Walze 4 aufgetragenen Leimspur 10 ist dabei von der Spaltweite S des Spaltes abhängig, welche konstant ist und bevorzugt 0,05 bis 0,15 mm betragen sollte.The nozzle 2 is shaped on the edge delimiting the outlet opening 3 in such a way that the lower edge side 7 in the illustration protrudes in the direction of the roller 4. At the same time, the roller 4 is arranged eccentrically, ie the axis of rotation of the roller 4 is arranged by the dimension E below the center M of the outlet opening 3. Due to the eccentric arrangement of the roller 4 and the protruding edge side 7 arranged downstream in relation to the direction of rotation A of the roller 4, there is a narrow gap S between the roller 4 and the edge side 7 a gap of 0.05 to 0.15 mm. As a result, an enlarged free space is formed above the gap S, in which the glue is dammed up to form a glue supply before it is applied to the roller 4. The glue is then transported away from the glue supply through the gap in a glue track 10 by the rotary movement of the roller 4. The thickness and / or amount of the glue line 10 applied to the roller 4 is dependent on the gap width S of the gap, which is constant and should preferably be 0.05 to 0.15 mm.

Während der weiteren Drehbewegung der Walze 4 wird die auf der Walze 4 aufgetragene Leimspur 10 auf den in die entgegengesetzte Richtung bewegten Umhüllungsstreifen 1 zu einer Leimnaht 6 aufgetragen. Dabei wird die Leimspur 10 aktiv unter Ausübung einer geringen Druckkraft auf den Umhüllungsstreifen 1 aufgerieben, wodurch die Qualität der auf dem Umhüllungsstreifen 1 aufgetragenen Leimnaht 6 hinsichtlich der einzuhaltenden Breite und Dicke erheblich verbessert werden kann. Im Idealfall wird die auf der Walze 4 durch den Spalt aufgetragene Leimspur 10 vollständig auf den Umhüllungsstreifen 1 aufgetragen, so dass die Walze 4 nach dem Ablaufen von dem Umhüllungsstreifen 1 eine blanke, leimfreie Oberfläche aufweist. Dabei kann die Dicke der auf der Walze aufgetragenen Leimspur 10 außerdem durch die Drehzahl der Walze 4 verändert werden, so dass die Leimspur 10 und die auf den Umhüllungsstreifen 1 aufgetragene Leimnaht 6 in der Dicke und Breite sehr einfach durch die Veränderung der Drehzahl der Walze 4 auf die Transportgeschwindigkeit des Umhüllungsstreifens 1 angepasst werden kann.During the further rotary movement of the roller 4, the glue track 10 applied to the roller 4 is applied to the wrapping strip 1 moved in the opposite direction to form a glue seam 6. The glue line 10 is actively rubbed open with the exertion of a slight pressure on the wrapping strip 1, whereby the quality of the glue seam 6 applied to the wrapping strip 1 can be considerably improved in terms of the width and thickness to be maintained. In the ideal case, the glue track 10 applied to the roller 4 through the gap is completely applied to the wrapping strip 1 so that the roller 4 has a blank, glue-free surface after it has run off the wrapping strip 1. The thickness of the glue track 10 applied to the roller can also be changed by the speed of the roller 4, so that the glue track 10 and the glue seam 6 applied to the wrapping strip 1 in thickness and width very easily by changing the speed of the roller 4 can be adapted to the transport speed of the wrapping strip 1.

Es hat sich herausgestellt, dass bei einer Auftragsmenge von 20 g/min und einer Stranggeschwindigkeit des Umhüllungsstreifens 1 von 600 m/min durch den unmittelbaren Auftrag der Leimspur aus einer Düse ohne die Verwendung einer Walze eine Leimnaht 6 mit einer Breite von 1 mm aufgetragen werden konnte, während bei identischer Leimmenge, Düse und Stranggeschwindigkeit durch die Verwendung der Walze 4 eine Leimnaht 6 mit einer Breite von 2,5 mm aufgetragen werden konnte. Die erheblich breitere Leimnaht 6 wies außerdem ein erheblich konstantere Dicke über die Breite auf, so dass der Leimdurchschlag verringert und die Klebkraft durch die verbesserte Ausnutzung des Klebstoffes erhöht werden konnte.It has been found that with an application rate of 20 g / min and a strand speed of the wrapping strip 1 of 600 m / min, the glue line is applied immediately A glue seam 6 with a width of 1 mm could be applied from a nozzle without the use of a roller, while a glue seam 6 with a width of 2.5 mm could be applied with an identical amount of glue, nozzle and strand speed by using the roller 4. The considerably wider glue seam 6 also had a considerably more constant thickness over the width, so that the glue penetration could be reduced and the adhesive strength could be increased through the improved utilization of the adhesive.

In der Figur 3 sind verschiedene Geometrien der Walzen 4 zu erkennen. In den oberen Darstellungen sind die Walzen 4 an ihrer Mantelfläche mit regelmäßig angeordneten Vertiefungen in Form von Ringrippen versehen, in denen die Leimmasse aufgenommen werden kann.In the Figure 3 different geometries of the rollers 4 can be seen. In the upper illustrations, the rollers 4 are provided on their outer surface with regularly arranged depressions in the form of annular ribs, in which the glue mass can be received.

In der unteren linken Darstellung ist die Walze 4 mit mehreren in Umfangsrichtung verlaufenden Rippen und dazwischen angeordneten Vertiefungen geformt, so dass die Leimspur 10 in einer durch die Form der Walze 4 vorgegebenen Dickenverteilung von der Düse 2 abtransportiert wird. Aufgrund der Dickenverteilung der Leimspur 10 wird die Leimnaht 6 wiederum mit in Längsrichtung des Umhüllungsstreifens 1 verlaufenden Zonen I mit einer geringen Leimdicke und Zonen II mit einer größeren Leimdicke auf den Umhüllungsstreifen 1 aufgetragen. Derselbe Effekt kann dadurch erzielt werden, indem die Leimspur 10 entweder durch eine entsprechende Form der Austrittsöffnung 3, einen geringen Abstand der Düse 2 und/oder durch die Wahl der Leimaustrittsmenge aus der Austrittsöffnung 3 in einer über den Querschnitt unterschiedlichen Dickenverteilung auf die Walze 4 aufgetragen wird, wie in der rechten unteren Darstellung zu erkennen ist.In the lower left-hand illustration, the roller 4 is shaped with a plurality of ribs running in the circumferential direction and depressions arranged in between, so that the glue track 10 is transported away from the nozzle 2 in a thickness distribution predetermined by the shape of the roller 4. Due to the thickness distribution of the glue line 10, the glue seam 6 is again applied to the wrapping strip 1 with zones I running in the longitudinal direction of the wrapping strip 1 with a small glue thickness and zones II with a greater glue thickness. The same effect can be achieved by applying the glue track 10 to the roller 4 either through a corresponding shape of the outlet opening 3, a small distance between the nozzle 2 and / or by selecting the amount of glue that emerges from the outlet opening 3 in a thickness distribution that differs over the cross section as can be seen in the lower right illustration.

Die Walze 4 kann auch eine in einem Spannfutter lösbar eingespannte Welle sein, so dass durch den Austausch der Wellen mit sehr geringem Aufwand Walzen 4 unterschiedlicher Abmessungen und unterschiedlicher Geometrie verwendet werden können.The roller 4 can also be a shaft that is releasably clamped in a chuck, so that by exchanging the shafts, rollers 4 of different dimensions and different geometries can be used with very little effort.

Je nachdem in welchem Abstand die Düse 2 angeordnet ist, können dann die Größe des Leimvorrats 9 und die Spaltweite zwischen der Walze 4 und der Düse 2 eingestellt werden. Neben dem Abstand der Düse kann außerdem die Drehzahl der Walze 4 als Einstellungsparameter verwendet werden, wobei die Leimnaht 6 durch die Wahl des Abstandes und der Drehzahl der Walze insbesondere hinsichtlich der Viskosität, der Transportgeschwindigkeit des Umhüllungsstreifens 1 und der Porosität des Umhüllungsstreifens 1 eingestellt werden kann.Depending on the distance at which the nozzle 2 is arranged, the size of the glue supply 9 and the gap width between the roller 4 and the nozzle 2 can then be adjusted. In addition to the distance between the nozzle, the speed of the roller 4 can also be used as a setting parameter, whereby the glue seam 6 can be adjusted by selecting the distance and the speed of the roller, in particular with regard to the viscosity, the transport speed of the wrapping strip 1 and the porosity of the wrapping strip 1 .

Die erfindungsgemäße Lösung bietet unabhängig von der Art und der Verwendung der Leimnaht 6 Vorteile hinsichtlich des Vermeidens der sogenannten Leimnasen, so dass die Verschmutzung und der erforderliche Aufwand zur Reinigung der Anlage verringert werden kann. Dies ist insbesondere auch bei der Nahtverklebung der Zigarette und der Nahtverklebung des die Tabakfasern umschließenden Umhüllungsstreifens 1 der Fall. Außerdem kann durch die Erfindung der Leimdurchschlag der Leimnaht 6 auf dem höherporösen Umhüllungsstreifen 1 des Filtermaterials zumindest verringert werden. Ferner kann die Klebkraft der Leimnaht 6 erhöht werden, wenn die Leimnaht 6 aus einer Kaltleimnaht gebildet ist, die an einem Heizsteg ausgehärtet wird.Regardless of the type and use of the glue seam 6, the solution according to the invention offers advantages in terms of avoiding so-called glue noses, so that the contamination and the effort required for cleaning the system can be reduced. This is also the case, in particular, when the seams of the cigarette and the seams of the wrapping strip 1 enclosing the tobacco fibers are bonded. In addition, the invention can at least reduce the glue penetration of the glue seam 6 on the more highly porous covering strip 1 of the filter material. Furthermore, the adhesive strength of the glue seam 6 can be increased if the glue seam 6 is formed from a cold glue seam which is cured on a heating bar.

Claims (12)

  1. Device for applying a glue track (6) to a moving wrapping strip (1) of a rod-shaped product of the tobacco processing industry, comprising
    - a nozzle (2) which is fixed relative to the wrapping strip (1) during the application of the glue track (6) and has
    - an outlet opening (3) which is directed towards the passing wrapping strip (1), from which opening the glue discharges,
    - a roller (4) which can be rotationally driven by means of a drive device being provided between the wrapping strip (1) and the outlet opening (3) of the nozzle (2), onto which roller the glue discharging from the outlet opening (3) is applied, and which roller applies the glue directly onto the wrapping strip (1),
    - the direction of rotation of the roller (4) being directed such that the movement of the roller (4) on the side facing the passing wrapping strip (1) is directed counter to the movement of the wrapping strip (1),
    characterised in that
    - the rim side (7) of the outlet opening that is arranged downstream with respect to the direction of rotation of the roller (4) is shaped so as to project in the direction of the roller (4).
  2. Device according to claim 1, characterised in that
    - the speed of the roller (4) can be changed.
  3. Device according to claim 2, characterised in that
    - the roller (4) has a diameter of 2 to 12 mm and is driven at a speed of 1000 rpm to 12000 rpm.
  4. Device according to any of the preceding claims, characterised in that
    - the distance between the roller (4) and the outlet opening (3) of the nozzle (2) is approximately 0.05 to 0.15 mm.
  5. Device according to any of the preceding claims, characterised in that
    - at least two outlet openings (3) are provided which are arranged behind one another in the axial direction of the roller (4), from which openings the glue is applied to the roller (4).
  6. Device according to any of the preceding claims, characterised in that
    - the roller (4) is formed by a shaft which extends out from an electric motor (5).
  7. Device according to any of the preceding claims, characterised in that
    - the region in which the glue is applied to the roller (4) and the region in which the glue is applied to the wrapping strip (1) by the roller (4) are arranged opposite one another on the roller (4).
  8. Device according to any of the preceding claims, characterised in that
    - the glue has a viscosity of at least 180 mPas.
  9. Device according to any of the preceding claims, characterised in that
    - the glue is applied in an amount of 5 g to 40 g per 500 m length of the wrapping strip (1).
  10. Device according to any of the preceding claims, characterised in that
    - the roller (4) is arranged eccentrically with respect to the outlet opening (3) of the nozzle (2).
  11. Device according to claim 10, characterised in that
    - the roller (4) is eccentrically offset in the direction of the edge of the outlet opening (3) of the nozzle (2), which edge is arranged downstream with respect to the direction of rotation of the roller (4).
  12. Device according to any of the preceding claims, characterised in that
    - the transport speed of the wrapping strip (1) is between 100 m/min and 700 m/min.
EP15174993.4A 2014-07-16 2015-07-02 Device for applying a glue track to a wrapping strip of a rod-shaped product of the tobacco processing industry Active EP2974798B1 (en)

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PL15174993T PL2974798T3 (en) 2014-07-16 2015-07-02 Device for applying a glue track to a wrapping strip of a rod-shaped product of the tobacco processing industry

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DE102014213858.2A DE102014213858B3 (en) 2014-07-16 2014-07-16 Apparatus for applying a glue trace to a wrapping strip of a rod-shaped product of the tobacco processing industry

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DE102014213858B3 (en) 2015-11-12
PL2974798T3 (en) 2021-05-31
EP2974798A1 (en) 2016-01-20
CN105266192B (en) 2019-09-20
CN105266192A (en) 2016-01-27

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