EP2613891B1 - Method and adhesive applicator for the contactless application of a multiplicity of discrete spots of adhesive, distributed over a surface area, permanently to a substrate - Google Patents
Method and adhesive applicator for the contactless application of a multiplicity of discrete spots of adhesive, distributed over a surface area, permanently to a substrate Download PDFInfo
- Publication number
- EP2613891B1 EP2613891B1 EP11770043.5A EP11770043A EP2613891B1 EP 2613891 B1 EP2613891 B1 EP 2613891B1 EP 11770043 A EP11770043 A EP 11770043A EP 2613891 B1 EP2613891 B1 EP 2613891B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- adhesive
- substrate
- applicator head
- application
- separating element
- 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.)
- Not-in-force
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D5/10—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an adhesive surface
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- 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
- B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
- B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
- B05C5/027—Coating heads with several outlets, e.g. aligned transversally to the moving direction of a web to be coated
- B05C5/0275—Coating heads with several outlets, e.g. aligned transversally to the moving direction of a web to be coated flow controlled, e.g. by a valve
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/14—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by electrical means
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- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
- E06B7/00—Special arrangements or measures in connection with doors or windows
- E06B7/16—Sealing arrangements on wings or parts co-operating with the wings
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- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
- E06B7/00—Special arrangements or measures in connection with doors or windows
- E06B7/16—Sealing arrangements on wings or parts co-operating with the wings
- E06B7/22—Sealing arrangements on wings or parts co-operating with the wings by means of elastic edgings, e.g. elastic rubber tubes; by means of resilient edgings, e.g. felt or plush strips, resilient metal strips
- E06B7/23—Plastic, sponge rubber, or like strips or tubes
- E06B7/2305—Plastic, sponge rubber, or like strips or tubes with an integrally formed part for fixing the edging
- E06B7/2307—Plastic, sponge rubber, or like strips or tubes with an integrally formed part for fixing the edging with a single sealing-line or -plane between the wing and the part co-operating with the wing
- E06B7/231—Plastic, sponge rubber, or like strips or tubes with an integrally formed part for fixing the edging with a single sealing-line or -plane between the wing and the part co-operating with the wing with a solid sealing part
Definitions
- the invention relates to a method and adhesive application device for non-contact application of a plurality of distributed on a surface, non-contiguous adhesive dots on a substrate for permanent retention with the features of the preamble of claim 7. Accordingly, is provided with respect to the adhesive application device, a plurality of on a surface distributed, non-contiguous adhesive dots on a substrate to permanent local whereabouts apply without contact.
- a rotatable applicator head is used.
- the applicator head has means distributed on its radial (outer) surface for transferring adhesive dots to a substrate.
- the substrate is generally planar, in particular web-shaped and is passed in a suitable manner on the rotating applicator head.
- the order pattern can be adhered to only as precisely as this non-contact centrifugal technology allows, namely in dependence on the rotational speed of the rotary head, the adhesive pressure pending there, the adhesive temperature, the ambient temperature and the type of adhesive.
- the ambient temperature remains in most cases a not completely controllable factor, since working in temperature-controlled production areas is usually too expensive.
- a non-generic application method for patterning adhesive dots that works according to the contact principle is known as pocket technology.
- the means for transferring the adhesive dots consist of small-caliber "cups", ie recesses in the roller surface of the applicator roll whose mostly circular base, depth and cup contour can be freely specified and produced, for example, by etching.
- the wells are depending on the desired surface density and distribution according to a desired Surface pattern introduced into the roll surface. The procedure is such that the wells are filled with adhesive by means of a leak roll or other means known from printing technology and the remaining surface of the applicator roll is kept free of the adhesive.
- the filled with adhesive cups can be brought by rotation of the roller surface of the applicator roll with surface contact or at least with line contact to a substrate or a transfer roller and the adhesive transferred to it.
- the volume of adhesive introduced in the individual wells can not be transferred to the substrate fast enough and, as a rule, not completely enough so that an adhesive thread is formed between the wells on the applicator roll and the glue dots on the substrate ,
- Such adhesive threads tear in an undefined manner and the thread cooling leads to the point of glue on the substrate not having sufficiently uniform contours.
- adhesive residues can remain in the wells and gradually add in operation and they make the applicator roll thus exchange or at least require cleaning.
- Another contact application method for hot melt adhesive on a surface is from the DE 2125387 A1 known.
- the job is carried out via a plurality of nozzles in a flat application plate, the supply holes are opened via needle-like, resiliently projecting from the plate valve tappet when the application plate is pressed flat on the substrate.
- This method is suitable for the batchwise hot melt application (batch operation).
- thread-free application systems are known, with which melted thermoplastic coating materials can be transferred from a coating head to a substrate.
- a printing pattern exhibiting Siebumblen Anlagen cylinder is known on which a to be provided with a printing pattern web-shaped or arcuate substrate in physical conditioning is guided under the pressure of a counter-roller linearly along.
- An elongated, parallel to the application roller arranged feed chamber, for coating materials has a nozzle slot which rests against the inner surface of the perforated cylinder jacket in the region of the contact line of the counter-pressure roller. The coating material is expressed from the nozzle slot by the cylinder jacket perforation in the physical contact of cylinder and substrate on the substrate.
- non-generic transfer methods are exemplified in DE 19905317 A1 and DE 4020420 A1 known.
- the EP 1 160 016 A2 discloses an adhesive applicator apparatus for applying a plurality of discontinuous adhesive dots distributed on a surface to a substrate for permanent retention therein, comprising a rotary applicator head having means for distributing the adhesive dots for transferring the adhesive dots to the substrate displaceable relative to the rotary applicator head wherein the transfer means are an order pattern forming openings in a roll surface of an applicator roll forming roll shell, which are acted upon on the inside of the roll shell with the adhesive.
- the invention is based on the problem of improving a generic adhesive application method and apparatus for surface patterns of adhesive dots in such a way that thread-like adhesive structures on the treated substrate as far as possible are eliminated.
- an adhesive application method with the features of claim 1 and an adhesive application device with the features of claim 7 is proposed. Accordingly, the method provides that a rotating applicator head carrying an aperture pattern on its circumference is displaced with lateral (radial) spacing from and relative to the surface of the substrate to be permanently provided with the pattern in an application direction. The adhesive is expelled to form lenticular bulges from the apertures of the applicator head in the region of a line or strip-like distance gap formed between the substrate and the applicator head.
- the adhesive bulges are brought into contact with the substrate in the region of the gap, without that da-Der Adhesive is expelled to form lenticular bulges from the apertures of the applicator head in the region of a line or strip-like gap formed between the substrate and the applicator head.
- the adhesive bulges are brought into contact with the substrate in the area of the gap without the application head touching the substrate.
- the adhesive protrusions are peeled off the respective openings while adhering to the substrate and forming adhesive dots on the substrate.
- the transfer means for the (small) adhesive volumes are a plurality of a desired order pattern forming openings in a roll surface of an applicator roll forming roller shell, which are acted upon on the inside of the roll shell with the adhesive.
- a clearance gap or nip is provided and dimensioned so that the adhesive can be pressed out to form lens-like bulges from the perforations of the application head in the region of the distance gap formed linearly or in strips between the substrate and the application head.
- the adhesive protrusions contact the substrate in the area where the gap is located, without the applicator head touching the substrate.
- the adhesive protrusions are peelable from the respective apertures while adhering to the substrate and forming adhesive dots on the substrate.
- the adhesive viscosity and thus its thread forming behavior can be controlled better and less dependent on the ambient temperature. It was recognized that a temperature gradient in the adhesive could be utilized between the gun and the substrate. Even very temperature-sensitive sheet or web-shaped substrates, such as films made of PE, can be permanently provided with a surface pattern of adhesive dots.
- Typical opening (breakthrough) cross sections are in the order of a few mm to a few microns, preferably between 2 and 0.01 mm and more preferably between 1 and 0.1 mm. As a rule, drill holes and thus cylindrical openings are sufficient. However, the opening cross sections may also have other cross-sectional shapes, e.g. also be made by lasers.
- Within the transfer roller can be provided elongated, approximately parallel to the roll axis Klebstoffzu slaughterhouse screeningn which always supply only a limited number of adhesive transfer means / openings with adhesive, while the remaining openings are kept free of adhesive.
- Such a chamber preferably extends along the line of transmission between the surface of the applicator roll and the adhesive accepting substrate. As a result, the tendency to thread formation is further reduced.
- the inner surface of the roll mantle is guided along the open exit surface of the chamber for adhesive substantially sealingly along the chamber wall surrounding the exit surface, so that a shearing action is exerted on the adhesive on the entrance side of the apertures.
- a thread-like or blade-shaped adhesive thread separating element may be located behind the transfer nip, as seen in the substrate movement direction Be provided.
- the arrangement of this element is very particularly preferably parallel to the axis of rotation of the applicator head, but may also have a direction parallel to the roller axis direction component to fulfill its function. In this way it is possible to selectively separate the approximately forming adhesive thread at an early stage after the beginning of its formation. This ensures that the still comparatively low-viscosity adhesive can pull back from the separation point to the transmitted to the substrate main mass of the respective point of adhesive.
- the surface tension of the drop of adhesive usually suffices.
- the located on the other side of the separating element of the Due to the early separation of the adhesive thread and its surface tension and viscosity, forming adhesive thread has the possibility of retracting to the transfer means on the surface of the applicator roll.
- the adhesive originating from the one thread part can be kept sufficiently viscous to be used further in the subsequent transfer step, ie a rotation of the transfer roller by less than 360 ° for the next point of adhesive.
- Such an adhesive-thread-separating member may also be successfully used together with adhesive applicator rollers for adhesive dots by means of the above-described cups, as well as those applications in which products other than adhesives such as granular plastics are produced.
- the above solution idea is therefore of independent inventive importance.
- the adhesive filament separator can be brought to an appropriate temperature.
- an electrical resistance thread or wire which is kept at the desired temperature by electric heating.
- the adhesive threads can be melted through, so that the proportion of mechanical separation effect is significantly reduced to completely.
- the distance of the adhesive-separating element from the nip between the transfer roller and the substrate can be varied depending on the application.
- Preferred Nipablines be up to 10cm, preferably up to 1cm and more preferably up to 0.1cm.
- FIG. 1 a rotatable about its longitudinal axis, circular cylindrical in cross-section applicator roll 1 is provided distributed over its circumference with a plurality of drilled openings 2 in a roll shell 1A.
- One Web-shaped substrate 3 is guided at a small distance below the roll surface along this.
- the peripheral speed of the roller surface can be synchronized with the linear speed of the substrate and optimized as desired with a view to the thread formation.
- adhesive dots 4 are formed on the substrate surface in accordance with the distribution pattern of the adhesive-transferring perforations on the roll surface. Details are out FIG. 5 seen.
- adhesive threads 4A can form. These are severed by means of an adhesive thread separating element 6, for example in the form of a hot thread at a location close to the nip between the roll surface and substrate web, preferably by melting and / or mechanically.
- the hot thread is stretched parallel to the roll axis and over its length but at least across the width of the substrate web 3 and supplied with electrical voltage at 6A in order to maintain a desired thread temperature and to be able to introduce sufficient heat into the separation point.
- an adhesive supply 7A lead to the applicator roll 1 to an adhesive chamber 7 in the roll interior.
- held stationary adhesive chamber housing 8 extends at least over the application width of the applicator roll 1 and seals against the inner surface of the roll shell 1A.
- An adhesive feed slot 7B leads from the elongated adhesive chamber 7 to the inner surface of the roll mantle 1A, thus feeding a series of apertures 2 during the time that this row passes the adhesive feed slot. Accordingly, the apertures 2 of this series give only in this period of time for a specific adhesive point 4 amount of adhesive.
- the adhesive separator 6 may be self-cleaning or one provided with a cleaning unit 10.
- a self-cleaning adhesive separator may vaporize or chemically decompose adhesive filament residues to clean the separator at its active length, all the time, or at certain intervals.
- FIG. 4 shows an embodiment of the invention with cleaning unit 10.
- an elongated adhesive-separating element in the form of, in particular electrically, heatable wire continuously around two pulleys 10A, 10B and 10C, at least one of which is provided with a rotary drive 10A, constantly or temporarily moved in the longitudinal direction.
- the zone active for the thread-separating step comes out of the same and can, for example, pass through a scraper 10D or another cleaning unit that cleans the surface of the adhesive-separating element 6.
- Possible adhesive residues can be collected in a collecting element 10E.
- the heating and temperature control of the adhesive separating element 6 can by means of one of the deflection rollers 10A and 10B by thermal or electrical contact, as shown in the left in FIG. 4 indicated, via a power supply 6A done.
- a peripheral adhesive-separating element 6 it is also possible to unwind a corresponding thread-like element from a coil and roll up on another or reversing the adhesive-separating element to lead through the separation points.
- the distance gap between the gun and the substrate, under continued relative movement of the same in Order direction be enlarged.
- the adhesive lens in the nip area can no longer get the necessary contact with the substrate.
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- Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Coating Apparatus (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Adhesive Tapes (AREA)
Description
Die Erfindung betrifft ein Verfahren und Klebstoffauftragsvorrichtung zum berührungsfreien Auftragen einer Vielzahl von auf eine Fläche verteilten, nicht zusammenhängenden Klebstoffpunkten auf ein Substrat zum dauerhaften Verbleib mit den Merkmalen des Oberbegriffs des Anspruchs 7, Demnach ist hinsichtlich der Klebstoffauftragsvorrichtung vorgesehen, eine Vielzahl von auf eine Fläche verteilten, nicht zusammenhängenden Klebstoffpunkten auf ein Substrat zum dortigen dauerhaften Verbleib berührungsfrei aufzutragen. Hierzu wird ein rotierbarer Auftragskopf verwendet. Der Auftragskopf weist an seiner radialen (äußeren) Oberfläche verteilt angeordnete Mittel zum Übertragen von Klebstoffpunkten auf ein Substrat auf. Das Substrat ist in der Regel flächig, insbesondere bahnförmig und wird in geeigneter Weise an dem rotierenden Auftragskopf vorbeigeführt.The invention relates to a method and adhesive application device for non-contact application of a plurality of distributed on a surface, non-contiguous adhesive dots on a substrate for permanent retention with the features of the preamble of
Beim Auftragen von Klebstoff auf ein Substrat, wie ein Filtertuch oder eine Membranfolie ist es in manchen Anwendungsgebieten wichtig, möglichst viel von der Substratoberfläche offen, d. h. klebstofffrei zu halten. Zu diesem Zweck ist es möglich, stark gestreckte und somit dünne Klebstofffäden oder -punkte auf das Substrat aufzutragen und hierfür einen Rotationskopf für den berührungslosen Klebstoffauftrag zu verwenden (
Bei diesem bekannten Verfahren kann das Auftragsmuster nur so exakt eingehalten werden, wie es diese berührungslose Schleudertechnik erlaubt, nämlich in Abhängigkeit von der Drehzahl des Rotationskopfes, dem dort anstehenden Klebstoffdruck, der Klebstofftemperatur, der Umgebungstemperatur und der Klebstoffart. Dabei bleibt die Umgebungstemperatur in den meisten Anwendungsfällen ein nicht vollständig beherrschbarer Faktor, da das Arbeiten in temperaturgesteuerten Produktionsräumen in der Regel zu aufwändig ist.In this known method, the order pattern can be adhered to only as precisely as this non-contact centrifugal technology allows, namely in dependence on the rotational speed of the rotary head, the adhesive pressure pending there, the adhesive temperature, the ambient temperature and the type of adhesive. The ambient temperature remains in most cases a not completely controllable factor, since working in temperature-controlled production areas is usually too expensive.
Ein nach dem Kontaktprinzip arbeitendes, nicht gattungsgemäßes Auftragsverfahren für Muster von Klebstoffpunkten ist als Näpfchentechnologie bekannt. Hierbei bestehen die Mittel zum Übertragen der Klebstoffpunkte aus kleinkalibrigen "Näpfchen", d. h. Ausnehmungen in der Walzenoberfläche der Auftragswalze, deren meist kreisrunde Grundfläche, Tiefe und Näpfchenkontur frei vorgebbar und z.B. durch Ätzen erzeugbar ist. Die Näpfchen werden je nach gewünschter Flächen-Dichte und Aufteilung nach einem gewünschten Flächenmuster in die Walzenoberfläche eingebracht. Die Arbeitsweise ist so, dass die Näpfchen mittels einer Leckwalze oder einem anderen aus der Drucktechnik bekannten Mittel mit Klebstoff gefüllt werden und die übrige Oberfläche der Auftragswalze vom Klebstoff freigehalten wird. Sodann können die mit Klebstoff befüllten Näpfchen durch Rotation der Walzenoberfläche der Auftragswalze mit Oberflächenkontakt oder zumindest mit Linienkontakt an ein Substrat oder eine Übertragungswalze herangeführt und der Klebstoff darauf übertragen werden. Bei diesem Verfahren ist sehr genau auf die Oberflächentemperatur der Auftragswalze und die Klebstofftemperatur zu achten, weil ansonsten einer übermäßigen Fadenbildung nach dem Übertragen des Klebstoffpunktes von der Walzenoberfläche auf das Substrat die Folge ist. D. h., dass sich das in dem einzelnen Näpfchen herangeführte Klebstoffvolumen sich nicht schnell genug und in der Regel auch nicht vollständig genug auf das Substrat übertragen lässt, so dass sich zwischen den Näpfchen auf der Auftragswalze und den Klebstoffpunkten auf dem Substrat ein Klebstofffaden ausbildet. Solche Klebstofffäden zerreißen in undefinierter Weise und die Fadenabkühlung führt dazu, dass der Klebstoffpunkt auf dem Substrat keine hinreichend gleichförmigen Konturen aufweist. Außerdem können Klebstoffreste in den Näpfchen verbleiben und diese im Betrieb nach und nach zusetzen und sie die Auftragswalze somit austausch- oder zumindest reinigungsbedürftig machen.A non-generic application method for patterning adhesive dots that works according to the contact principle is known as pocket technology. In this case, the means for transferring the adhesive dots consist of small-caliber "cups", ie recesses in the roller surface of the applicator roll whose mostly circular base, depth and cup contour can be freely specified and produced, for example, by etching. The wells are depending on the desired surface density and distribution according to a desired Surface pattern introduced into the roll surface. The procedure is such that the wells are filled with adhesive by means of a leak roll or other means known from printing technology and the remaining surface of the applicator roll is kept free of the adhesive. Then, the filled with adhesive cups can be brought by rotation of the roller surface of the applicator roll with surface contact or at least with line contact to a substrate or a transfer roller and the adhesive transferred to it. In this method, it is very important to pay attention to the surface temperature of the applicator roll and the adhesive temperature, because otherwise an excessive thread formation after transfer of the adhesive point from the roll surface to the substrate is the result. In other words, the volume of adhesive introduced in the individual wells can not be transferred to the substrate fast enough and, as a rule, not completely enough so that an adhesive thread is formed between the wells on the applicator roll and the glue dots on the substrate , Such adhesive threads tear in an undefined manner and the thread cooling leads to the point of glue on the substrate not having sufficiently uniform contours. In addition, adhesive residues can remain in the wells and gradually add in operation and they make the applicator roll thus exchange or at least require cleaning.
Ein anderes Kontakt-Auftragsverfahren für Schmelzkleber auf eine Fläche ist aus der
Der Erfindung liegt das Problem zugrunde, ein gattungsgemäßes Klebstoffauftragsverfahren und -vorrichtung für Flächenmuster von Klebstoffpunkten dahingehend zu verbessern, dass fadenartige Klebstoffstrukturen auf dem behandelten Substrat möglichst weitgehend entfallen. Zur Lösung dieser Aufgabe wird ein Klebstoffauftragsverfahren mit den Merkmalen des Patentanspruchs 1 und eine Klebstoffauftragsvorrichtung mit den Merkmalen des Anspruchs 7 vorgeschlagen. Dementsprechend sieht das Verfahren vor, dass ein rotierender, ein Durchbrechungsmuster auf seinem Umfang tragender Auftragskopf mit seitlichem (radialem) Abstand von und relativ zu der mit dem Muster dauerhaft zu versehenden Oberfläche des Substrates in einer Auftragsrichtung verlagert wird. Der Klebstoff wird unter Bilden linsenartiger Auswölbungen aus den Durchbrechungen des Auftragskopfes im Bereich eines linien- oder streifenartigen zwischen dem Substrat und dem Auftragskopf gebildeten Abstandsspaltes herausgedrückt. Die Klebstoff-Auswölbungen werden im Bereich des Abstandsspaltes mit dem Substrat in Berührung gebracht, ohne dass da-Der Klebstoff wird unter Bilden linsenartiger Auswölbungen aus den Durchbrechungen des Auftragskopfes im Bereich eines linien- oder streifenartigen zwischen dem Substrat und dem Auftragskopf gebildeten Abstandsspaltes herausgedrückt. Die Klebstoff-Auswölbungen werden im Bereich des Abstandsspaltes mit dem Substrat in Berührung gebracht, ohne dass dabei der Auftragskopf das Substrat berührt. Die Klebstoff-Auswölbungen werden unter Anhaften an dem Substrat und Ausbilden von Klebstoffpunkten auf dem Substrat von den jeweiligen Durchbrechungen abgezogen.The invention is based on the problem of improving a generic adhesive application method and apparatus for surface patterns of adhesive dots in such a way that thread-like adhesive structures on the treated substrate as far as possible are eliminated. To solve this problem, an adhesive application method with the features of
Hinsichtlich einer gattungsgemäßen Klebstoffauftragsvorrichtung sieht die Erfindung vor, dass die Übertragungsmittel für die (kleinen) Klebstoffvolumina eine Vielzahl von ein gewünschtes Auftragsmuster bildenden Durchbrechungen in einem eine Walzenoberfläche einer Auftragswalze bildenden Walzenmantel sind, die auf der Innenseite des Walzenmantels mit dem Klebstoff beaufschlagbar sind. Zwischen der Walzenoberfläche und dem Substrat ist ein Abstandsspalt oder Nip derart vorgesehen und bemessen, dass der Klebstoff unter Bilden linsenartiger Auswölbungen aus den Durchbrechungen des Auftragskopfes im Bereich des linien- oder streifenartig zwischen dem Substrat und dem Auftragskopf gebildeten Abstandsspaltes herausdrückbar ist. Die Klebstoff-Auswölbungen gelangen in dem Bereich, in dem sich der Abstandsspalt befindet mit dem Substrat in Berührung, ohne dass dabei der Auftragskopf das Substrat berührt. Die Klebstoff-Auswölbungen sind unter Anhaften an dem Substrat und Ausbilden von Klebstoffpunkten auf dem Substrat von den jeweiligen Durchbrechungen abziehbar.With regard to a generic adhesive application device, the invention provides that the transfer means for the (small) adhesive volumes are a plurality of a desired order pattern forming openings in a roll surface of an applicator roll forming roller shell, which are acted upon on the inside of the roll shell with the adhesive. Between the roller surface and the substrate, a clearance gap or nip is provided and dimensioned so that the adhesive can be pressed out to form lens-like bulges from the perforations of the application head in the region of the distance gap formed linearly or in strips between the substrate and the application head. The adhesive protrusions contact the substrate in the area where the gap is located, without the applicator head touching the substrate. The adhesive protrusions are peelable from the respective apertures while adhering to the substrate and forming adhesive dots on the substrate.
Durch die Erfindung kann die Klebstoffviskosität und damit ihr Fadenbildungsverhalten besser und weniger von der Umgebungstemperatur abhängig gesteuert werden. Es wurde erkannt, dass zwischen dem Auftragskopf und dem Substrat ein Temperaturgefälle im Klebstoff nutzbar gemacht werden kann. Selbst sehr temperaturempfindliche bogen- oder bahnförmige Substrate, wie Folien aus PE, können mit einem Flächenmuster aus Klebstoffpunkten dauerhaft versehen werden.By virtue of the invention, the adhesive viscosity and thus its thread forming behavior can be controlled better and less dependent on the ambient temperature. It was recognized that a temperature gradient in the adhesive could be utilized between the gun and the substrate. Even very temperature-sensitive sheet or web-shaped substrates, such as films made of PE, can be permanently provided with a surface pattern of adhesive dots.
Typische Öffnungs- (Durchbrechungs-) querschnitte liegen in der Größenordnung zwischen wenigen mm und einigen µm, vorzugsweise zwischen 2 und 0,01 mm und besonders bevorzugt zwischen 1 und 0,1 mm. In der Regel reichen durch Bohren hergestellte und damit zylindrische Durchbrechungen aus. Die Öffnungsquerschnitte können allerdings auch andere Querschnittsformen erhalten und z.B. auch durch Lasern hergestellt werden. Innerhalb der Übertragungswalze können längliche, zur Walzenachse etwa parallel angeordnete Klebstoffzuführkammern vorgesehen sein, die immer nur eine begrenzte Anzahl an Klebstoffübertragungsmitteln/Durchbrechungen mit Klebstoff versorgen, während die übrigen Durchbrechungen klebstofffrei gehalten werden. Eine solche Kammer erstreckt sich bevorzugt entlang der Übertragungslinie zwischen der Oberfläche der Auftragswalze und dem den Klebstoff übernehmenden Substrat. Hierdurch wird die Neigung zur Fadenbildung weiter vermindert. Die Innenoberfläche des Walzenmantels wird an der offenen Austrittsfläche der Kammer für Klebstoff im Wesentlichen dichtend an der die Austrittsfläche umgebenden Kammerwand entlang geführt, so dass eine Scherwirkung auf den Klebstoff an der Eintrittsseite der Durchbrechungen ausgeübt wird.Typical opening (breakthrough) cross sections are in the order of a few mm to a few microns, preferably between 2 and 0.01 mm and more preferably between 1 and 0.1 mm. As a rule, drill holes and thus cylindrical openings are sufficient. However, the opening cross sections may also have other cross-sectional shapes, e.g. also be made by lasers. Within the transfer roller can be provided elongated, approximately parallel to the roll axis Klebstoffzuführkammern which always supply only a limited number of adhesive transfer means / openings with adhesive, while the remaining openings are kept free of adhesive. Such a chamber preferably extends along the line of transmission between the surface of the applicator roll and the adhesive accepting substrate. As a result, the tendency to thread formation is further reduced. The inner surface of the roll mantle is guided along the open exit surface of the chamber for adhesive substantially sealingly along the chamber wall surrounding the exit surface, so that a shearing action is exerted on the adhesive on the entrance side of the apertures.
Um die negativen Folgen einer gewissen Fadenbildung, die auch mit der erfindungsgemäßen Vorrichtung in der Regel nicht vollständig unterbunden werden kann, so gering wie möglich zu halten, kann ein faden- oder klingenförmiges Klebstofffaden-Trennelement an einer in Substrat-Bewegungsrichtung gesehen hinter dem Übertragungsnip gelegenen Stelle vorgesehen werden. Die Anordnung dieses Elementes erfolgt ganz besonders bevorzugt parallel zur Drehachse des Auftragskopfes, kann aber auch eine mit der Walzenachse parallele Richtungskomponente aufweisen, um seine Funktion zu erfüllen. Auf diese Weise ist es möglich, den sich etwa bildenden Klebstofffaden zu einem frühen Zeitpunkt nach dem Beginn seines Entstehens gezielt zu trennen. Dadurch wird erreicht, dass der noch vergleichsweise niederviskose Klebstoff sich von der Trennstelle zur auf das Substrat übertragenen Hauptmasse des betreffenden Klebstoffpunktes zurück ziehen kann. Hierzu reicht die Oberflächenspannung des Klebstofftropfens in der Regel aus. Der auf der anderen Seite des Trennelementes gelegene Teil des sich ausbildenden Klebstofffadens hat aufgrund der frühzeitigen Durchtrennung des Klebstofffadens und seiner Oberflächenspannung und Viskosität die Möglichkeit, sich auf das Übertragungsmittel an der Oberfläche der Auftragswalze wieder zurückzuziehen. Im Falle von aus Durchbrechungen in einem Walzenmantel gebildeten Übertragungsmitteln kann der aus dem einen Fadenteil stammende Klebstoff ausreichend viskos gehalten werden, um beim nachfolgenden Übertragungsschritt, also einer Rotation der Übertragungswalze um weniger als 360° für den nächsten Klebstoffpunkt weiterverwendet werden. Ein derartiges Klebstofffaden-Trennelement kann auch zusammen mit Klebstoffauftragswalzen für Klebstoffpunkte mittels der oben beschriebenen Näpfchen sowie auch bei solchen Anwendungen erfolgreich eingesetzt werden, bei denen andere Produkte als Klebstoffe, wie granulierbare Kunststoffe hergestellt werden. Der vorstehende Lösungsgedanke ist also von eigenständig erfinderischer Bedeutung.In order to minimize the negative consequences of a certain thread formation, which can not be completely prevented even with the device according to the invention as a rule, a thread-like or blade-shaped adhesive thread separating element may be located behind the transfer nip, as seen in the substrate movement direction Be provided. The arrangement of this element is very particularly preferably parallel to the axis of rotation of the applicator head, but may also have a direction parallel to the roller axis direction component to fulfill its function. In this way it is possible to selectively separate the approximately forming adhesive thread at an early stage after the beginning of its formation. This ensures that the still comparatively low-viscosity adhesive can pull back from the separation point to the transmitted to the substrate main mass of the respective point of adhesive. For this purpose, the surface tension of the drop of adhesive usually suffices. The located on the other side of the separating element of the Due to the early separation of the adhesive thread and its surface tension and viscosity, forming adhesive thread has the possibility of retracting to the transfer means on the surface of the applicator roll. In the case of transmission means formed by perforations in a roll shell, the adhesive originating from the one thread part can be kept sufficiently viscous to be used further in the subsequent transfer step, ie a rotation of the transfer roller by less than 360 ° for the next point of adhesive. Such an adhesive-thread-separating member may also be successfully used together with adhesive applicator rollers for adhesive dots by means of the above-described cups, as well as those applications in which products other than adhesives such as granular plastics are produced. The above solution idea is therefore of independent inventive importance.
Um ein Zurückziehen der getrennten Klebstofffäden an ihren jeweiligen Ausgangspunkt zu erleichtern, kann das Klebstofffaden-Trennelement auf eine geeignete Temperaur gebracht werden. Insbesondere ist es möglich, einen elektrischen Widerstandsfaden oder -draht zu verwenden, der durch elektrische Beheizung auf der gewünschten Temperatur gehalten wird. Dadurch können die Klebstofffäden durchgeschmolzen werden, so dass der Anteil an mechanischer Trennwirkung wesentlich bis völlig verringert wird. Der Abstand des Klebstoff-Trennelementes vom Nip zwischen Übertragungswalze und Substrat kann je nach Anwendungsfall variiert werden. Bevorzugte Nipabstände betragen bis zu 10cm, vorzugsweise bis zu 1cm und besonders bevorzugt bis zu 0,1cm.To facilitate retraction of the separated adhesive filaments to their respective starting point, the adhesive filament separator can be brought to an appropriate temperature. In particular, it is possible to use an electrical resistance thread or wire which is kept at the desired temperature by electric heating. As a result, the adhesive threads can be melted through, so that the proportion of mechanical separation effect is significantly reduced to completely. The distance of the adhesive-separating element from the nip between the transfer roller and the substrate can be varied depending on the application. Preferred Nipabstände be up to 10cm, preferably up to 1cm and more preferably up to 0.1cm.
Die vorgenannten sowie die beanspruchten und in den Ausführungsbeispielen beschriebenen erfindungsgemäß zu verwendenden Bauteile unterliegen in ihrer Größe, Formgestaltung, Materialauswahl und technischen Konzeption keinen besonderen Ausnahmebedingungen, so dass die in dem Anwendungsgebiet bekannten Auswahlkriterien uneingeschränkt Anwendung finden könnenThe above-mentioned and the claimed components to be used according to the invention described in the exemplary embodiments are not subject to special conditions of size, shape, material selection and technical design, so that the selection criteria known in the field of application can be used without restriction
Weitere Einzelheiten, Merkmale und Vorteile des Gegenstandes der Erfindung ergeben sich aus den Unteransprüchen, sowie aus der nachfolgenden Beschreibung und der zugehörigen- Zeichnung, in der - beispielhaft - ein Ausführungsbeispiel einer Auftragsvorrichtung für Klebstoffpunkte dargestellt ist. Auch einzelne Merkmale der Ansprüche oder der Ausführungsformen können mit anderen Merkmalen anderer Ansprüche und Ausführungsformen kombiniert werden.Further details, features and advantages of the subject matter of the invention will become apparent from the subclaims, as well as from the following description and the accompanying drawings, in which - by way of example - an embodiment of an applicator for adhesive dots is shown. Also, individual features of the claims or of the embodiments may be combined with other features of other claims and embodiments.
In der Zeichnung zeigen
- Fig. 1
- eine schematische Darstellung der Klebstoffauftragvorrichtung in Stirnseitenansicht;
- Fig. 2
- dieselbe Vorrichtung in einer Seitenansicht der Auftragswalze (Ansicht A-A gemäß
Figur 1 ); - Fig. 3
- einen Querschnitt durch die Vorrichtung entlang der Schnittlinie III-III gemäß
Fig. 2 ; - Fig.4
- eine alternative Ausführung einer Klebstoffauftragsvorrichtung in einer Seitenansicht entsprechend
Fig. 2 sowie - Fig. 5
- eine Detaildarstellung des Abziehens eines Klebstoffvolumens aus einem Klebstoffauftragskopf.
- Fig. 1
- a schematic representation of the adhesive application device in front view;
- Fig. 2
- the same device in a side view of the applicator roll (view AA according to
FIG. 1 ); - Fig. 3
- a cross section through the device along the section line III-III according to
Fig. 2 ; - Figure 4
- an alternative embodiment of an adhesive applicator in a side view accordingly
Fig. 2 such as - Fig. 5
- a detailed view of the removal of an adhesive volume from an adhesive applicator head.
Wie aus
Wie aus
Nach dem Durchtrennen der sich daraufhin zwischen dem Substrat 3 am Klebstoffpunkt 4 und den Durchbrechungen 2 ausbildenden Klebstofffaden 4A zieht sich die eine Fadenhälfte zu ihrer Durchbrechung 2 und die andere Fadenhälfte zu ihrem Klebstoffpunkt 4 zurück.After severing the then pulls between the
Gemäß bevorzugten Ausführungsformen kann das Klebstoff- Trennelement 6 selbstreinigend sein oder eine mit einer Reinigungseinheit 10 versehen sein. Ein selbstreinigendes Klebstoff-Trennelement kann zum Beispiel Reste von Klebstofffäden verdampfen oder chemisch so zersetzen, dass das Trennelement auf seiner aktiven Länge ständig oder nach bestimmten Zeitabständen gereinigt wird.According to preferred embodiments, the
Um das flächenverteilte dauerhafte Auftragen von nicht zusammenhängenden Klebstoffpunkten auf dem Substrat in bestimmten in Auftragsrichtung gesehenen Abständen unterbrechen zu können, kann der Abstandsspalt zwischen dem Auftragskopf und dem Substrat, unter fortgesetzter Relativbewegung derselben in Auftragsrichtung, vergrößert werden. Dadurch kann die Klebstofflinse im Nipbereich nicht mehr den erforderlichen Kontakt zum Substrat bekommen.In order to interrupt the area-distributed permanent application of non-contiguous adhesive dots on the substrate in certain seen in the direction of order intervals, the distance gap between the gun and the substrate, under continued relative movement of the same in Order direction, be enlarged. As a result, the adhesive lens in the nip area can no longer get the necessary contact with the substrate.
- 11
- Auftragswalzeapplicator roll
- 1A1A
- Walzenmantelroll shell
- 1B1B
- Walzenachseroll axis
- 22
- Durchbrechungenperforations
- 33
- Substratsubstratum
- 44
- Klebstoffpunkteadhesive points
- 4A4A
- Klebstofffädenadhesive threads
- 4B4B
- Auswölbungbulge
- 66
- Klebstoff-FadentrennelementAdhesive-thread-separating element
- 6A6A
- elektrische Spannungsversorgungelectrical power supply
- 77
- KlebstoffverteilkammerKlebstoffverteilkammer
- 7A7A
- KlebstoffzuführleitungKlebstoffzuführleitung
- 7B7B
- KlebstoffspeiseschlitzAdhesive feed slot
- 88th
- KlebstoffkammergehäuseAdhesive chamber housing
- 99
- Substrat-AuflagstischSubstrate Auflagstisch
- 1010
- Reinigungseinheitcleaning unit
- 10A10A
- Antriebdrive
- 10B10B
- Umlenkungsrolledeflection roll
- 10C10C
- Umlenkungsrolledeflection roll
- 10D10D
- Abstreiferscraper
- 10E10E
- Auffangelementcollecting element
- 1111
- Auftragsrichtungapplication direction
- 1212
- Bewegungseinheitmoving unit
- 1313
- AbstandsveränderungseinheitDistance changing unit
- GG
- Abstandsspaltspacing gap
- LL
- Längsersteckunglongitudinal extension
Claims (16)
- A method for the application of a multiplicity of discrete spots of adhesive distributed over a surface area onto a substrate to remain permanently thereon, characterized in that
a rotating applicator head bearing a perforation pattern on the periphery thereof is displaced at a radial distance from and relative to the surface of the substrate (3) that is to be furnished permanently with the pattern, wherein the substrate (3) is displaced in an application direction (11) relative to the rotating applicator head,
the adhesive is pressed out of the perforations (2) in the applicator head in the area of a linear or strip-like gap (9) formed between the substrate (3) and the applicator head, creating lenticular adhesive bulges (4B),
the adhesive bulges (4B) are brought into contact with the substrate (3) in the area of the gap (9), wherein the applicator head does not touch the substrate (3), and
the adhesive bulges (4B) are detached from the respective perforations (2), adhering to the substrate (3) and forming adhesive spots (4) on the substrate (3). - The method according to claim 1, characterized in that adhesive filaments forming between the substrate and the rotating applicator head behind the transfer clearance are severed at a predetermined distance behind the transfer clearance by means of an adhesive thread separating element extending along the applicator head, in particular by melting.
- The method according to claim 2, characterized in that the separation is effected by electrical resistance heating.
- The method according to either of claims 2 or 3, characterized in that the elongated adhesive filament separating element is moved continuously or intermittently in a first or a second direction of the longitudinal extension thereof.
- The method according to any one of claims 2 to 4, characterized in that the adhesive filament separating element is cleaned continuously or periodically.
- The method according to any one of claims 1 to 5, characterized in that the permanent application of discrete adhesive spots over a distribution area on the substrate is interrupted at defined intervals when viewed in the direction of application by enlarging the gap between the applicator head and the substrate while the relative movement of the same continues in the direction of application.
- An adhesive application apparatus for contactless application of a multiplicity of discrete spots of adhesive, distributed over a surface onto a substrate to remain permanently thereon, comprising a rotating applicator head having means disposed for the distribution of the adhesive spots for transferring the adhesive spots to the substrate, which is displaceable relative to the rotating applicator head, characterized in that
the transfer means consist of perforations (2) that create an application pattern in an outer roller shell (1A) of a rolling surface of an application roller (1), which perforations are chargeable with the adhesive on the inside of the outer roller shell (1A), and that
a gap (G) or clearance is provided between the roller surface and the substrate (3) and dimensioned in such manner that the adhesive can be expressed out of the perforations (2) in the applicator head forming lenticular bulges (4B) in the area of the linear or strip-like gap (G) created between the substrate (3) and the applicator head, and the adhesive bulges (4B) come into contact with the substrate (3) in the area of the gap (G), while the applicator head does not touch the substrate (3), and
the bulges (4B) are detachable from the respective perforations (2) while still adhering to the substrate (3) and forming adhesive spots (4) on the substrate (3) of the respective openings. - An adhesive application device according to claim 7, characterized in that the largest cross-sectional dimension of the perforations (2), which may in particular be holes having different geometries or also slits, is between 2 mm and 0.01 mm and particularly preferably between 1 and 0.1 mm.
- The adhesive application device according to either of claims 7 or 8, characterized in that an adhesive distribution chamber (7) lies flush against the inner surface of the roller shell (1A) and the aperture edges thereof are sealed.
- The adhesive application device according to any one of claims 7 to 9, characterized in that a filamentous or blade-shaped adhesive thread separating element (6) is arranged with a directional component parallel to the roller axis (1B) at a point behind the transfer clearance in the direction of application.
- The adhesive application device according to claim 10, characterized in that the adhesive thread separating element (6) is positioned at a distance of up to 10 cm, preferably up to 1 cm, and particularly preferably up to 0.1 cm behind the transfer clearance.
- The adhesive application device according to either of claims 10 or 11, characterized in that the adhesive thread separating element (6) is heatable, and in particular is adjustable to generate sufficient heating power to melt through adhesive filaments.
- The adhesive application device according to any one of claims 10 to 12, characterized in that a movement unit (12) is provided for continuously or intermittently moving the elongated adhesive thread separating element (6) in a first or a second direction of the longitudinal extension thereof.
- The adhesive application device according to any one of claims 10 to 13, characterized in that a cleaning unit (10) is provided for continuous or periodic cleaning of the adhesive thread separating element.
- The adhesive application device according to any one of claims 7 to 14, characterized in that a distance adjustment unit (13) is provided for selectively increasing the gap (G) between the applicator head and the substrate in defined distances when viewed in the direction of application direction (11) while the relative movement between the substrate and is the rotating applicator head continues.
- Use of an adhesive application device according to any one of claims 7 to 15, characterized in that an application roller furnished with shell perforations and with an adhesive supply in the interior thereof is used for producing a permanent surface pattern of adhesive geometries on a substrate (3).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE202010012278U DE202010012278U1 (en) | 2010-09-07 | 2010-09-07 | An adhesive applicator for surface patterns of a plurality of non-contiguous glue dots on a substrate |
PCT/EP2011/004502 WO2012031750A1 (en) | 2010-09-07 | 2011-09-07 | Method and adhesive applicator for the contactless application of a multiplicity of discrete spots of adhesive, distributed over a surface area, permanently to a substrate |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2613891A1 EP2613891A1 (en) | 2013-07-17 |
EP2613891B1 true EP2613891B1 (en) | 2015-03-25 |
Family
ID=44508619
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11770043.5A Not-in-force EP2613891B1 (en) | 2010-09-07 | 2011-09-07 | Method and adhesive applicator for the contactless application of a multiplicity of discrete spots of adhesive, distributed over a surface area, permanently to a substrate |
Country Status (4)
Country | Link |
---|---|
US (1) | US20130209702A1 (en) |
EP (1) | EP2613891B1 (en) |
DE (1) | DE202010012278U1 (en) |
WO (1) | WO2012031750A1 (en) |
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Publication number | Priority date | Publication date | Assignee | Title |
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US20160371664A1 (en) * | 2015-06-19 | 2016-12-22 | Ncr Corporation | Slotted rotatable drum and method of using same |
CN208494752U (en) * | 2018-03-12 | 2019-02-15 | 常州恒锌禹晟智能装备有限公司 | A kind of PVDF isolation film coating mechanism |
FR3097802B1 (en) * | 2019-06-27 | 2021-07-02 | Qwarzo | MACHINE AND PROCESS FOR THE PRODUCTION OF TOUILLETTES OR MIXING STICKS FOR BEVERAGES |
CN115415107B (en) * | 2022-09-02 | 2024-02-23 | 浙江宇狮包装材料有限公司 | Patterning coating device based on laser engraving |
DE102023108694A1 (en) | 2023-04-05 | 2024-04-18 | Audi Aktiengesellschaft | Application device and robot arrangement |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2125387C3 (en) * | 1971-05-21 | 1975-02-27 | Ullrich, Walter, 8752 Kaelberau | Device for applying, in particular, hot-melt adhesives to workpieces |
GB2220872B (en) * | 1988-06-16 | 1992-07-08 | Dow Chemical Co | Bonding backing material to a substrate in carpet manufacture |
DE4020420A1 (en) * | 1990-06-27 | 1992-01-02 | Volker Ludwig | METHOD FOR APPLYING LIQUID, PASTOESE OR PLASTIC SUBSTANCES TO A SUBSTRATE |
DE19905317A1 (en) * | 1999-02-09 | 2000-08-10 | Voith Sulzer Papiertech Patent | Liquid or paste application device for running backing, with convex side of sieve element facing backing |
EP1057541A1 (en) * | 1999-06-04 | 2000-12-06 | Solipat Ag | Device and method for partially applying a coating and web with a partial coating |
KR100764675B1 (en) * | 2002-06-14 | 2007-10-08 | 간사이 페인트 가부시키가이샤 | Coating method |
US7291359B2 (en) * | 2004-08-18 | 2007-11-06 | 3M Innovative Properties Company | Method and apparatus for making an adhesive cleaning sheet |
DE102006016584B4 (en) | 2005-09-27 | 2016-02-25 | Illinois Tool Works Inc. | Method and apparatus for applying adhesive threads and dots to a substrate |
-
2010
- 2010-09-07 DE DE202010012278U patent/DE202010012278U1/en not_active Expired - Lifetime
-
2011
- 2011-09-07 US US13/821,372 patent/US20130209702A1/en not_active Abandoned
- 2011-09-07 EP EP11770043.5A patent/EP2613891B1/en not_active Not-in-force
- 2011-09-07 WO PCT/EP2011/004502 patent/WO2012031750A1/en active Application Filing
Also Published As
Publication number | Publication date |
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WO2012031750A1 (en) | 2012-03-15 |
US20130209702A1 (en) | 2013-08-15 |
DE202010012278U1 (en) | 2011-12-22 |
EP2613891A1 (en) | 2013-07-17 |
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