EP0384278B1 - Process and device for applying liquid, pasty or plastic substances to a substrate - Google Patents

Process and device for applying liquid, pasty or plastic substances to a substrate Download PDF

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Publication number
EP0384278B1
EP0384278B1 EP90102857A EP90102857A EP0384278B1 EP 0384278 B1 EP0384278 B1 EP 0384278B1 EP 90102857 A EP90102857 A EP 90102857A EP 90102857 A EP90102857 A EP 90102857A EP 0384278 B1 EP0384278 B1 EP 0384278B1
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EP
European Patent Office
Prior art keywords
cylinder
substrate
coating
substance
coated substrate
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EP90102857A
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German (de)
French (fr)
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EP0384278A3 (en
EP0384278A2 (en
Inventor
Volker Ludwig
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Zweckform Buero Produkte GmbH
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Individual
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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
    • B05C1/003—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 incorporating means for heating or cooling the liquid or other fluent material
    • 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
    • B05C1/10—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 liquid or other fluent material being supplied from inside 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
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/001—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work incorporating means for heating or cooling the liquid or other fluent material
    • 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
    • B05C5/0254—Coating heads with slot-shaped outlet
    • B05C5/0258—Coating heads with slot-shaped outlet flow controlled, e.g. by a valve
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F15/00—Screen printers
    • B41F15/08—Machines
    • B41F15/0831—Machines for printing webs
    • B41F15/0836—Machines for printing webs by means of cylindrical screens or screens in the form of endless belts

Definitions

  • the invention relates to a method for applying liquid, pasty or plastic substances, in particular thermoplastics, to a substrate, the substance being melted, heated and applied to the substrate through an opening gap of a coating head and through a perforated cylinder, which is then removed from the substrate Cylinder is lifted off, as well as a device for this.
  • Such a device is known for example from DE-A-36 38 307 corresponding to WO 88/03442.
  • WO 88/03442 it is provided for this that the coating head itself is heated and that further adjustable ones are provided around the coating head Heating devices are provided which act on the metal cylinder with heat from the inside.
  • a printing unit for an offset rotary printing press is also known from DE-U-33 13 088.
  • Plate cylinders are heated by heating fluid or resistance heating is provided in one cylinder.
  • two slip rings are provided on a shaft section of the plate cylinder, to each of which a power supply line, which leads to resistance heating, is placed.
  • the slip rings and the power supply line are insulated from each other and from the cylinder.
  • the object of the present invention is to show further improvements in the application of the molten substance to the substrate and to have a favorable influence on the coating quality.
  • the cylinder is connected to an energy source and is itself designed as a heat source for the substance.
  • the cylinder which serves as a template for the coating, was at most irradiated with heat from outside or inside.
  • the basic idea of the present invention is to design the cylinder itself as a heat source, it preferably being connected to a power source and thereby serving as resistance heating. As a result, the heating of the cylinder can be controlled much more precisely, so that the effects of the heating of the cylinder on the coating itself can also be regulated.
  • a sliding contact is preferably used to connect the metal cylinder to the power source.
  • the invention also covers the additional idea that after the coated substrate has been lifted off the cylinder itself, the threads between the coating and the cylinder are removed. On the one hand, this can be done mechanically, for example by cutting the threads.
  • preference is given to radiation for example thermal radiation, which, in whatever form, is introduced or radiated into the region between the cylinder and the coated substrate.
  • a laser source which removes the threads without further difficulties appears to be particularly suitable here.
  • the laser also has the advantage, when it strikes the coated substrate, that it melts the surface of the coating drops and cross-links them better. This also significantly improves the quality of the coating.
  • a cylindrical lens which generates a linear focus, can also be used to remove the threads.
  • the coating of the coated substrate with an additional material web takes place only subsequently to the coating of the substrate, heat then having to be supplied to the coated substrate or the coating substance in order for it to be effective in connecting the material webs.
  • the present invention also encompasses the idea that the coated substrate is covered with the material web immediately after it has been lifted off the cylinder, so that an additional operation of reheating or keeping warm is saved. For this purpose, it should prove to be most advantageous if the lifting roller itself is assigned a corresponding calender for feeding the material web.
  • this shows a schematic representation of a device according to the invention for applying liquid, plastic or pasty substances to a substrate, partly as a block diagram, partly in cross section.
  • a substrate 1 to be coated runs into a coating gap 2 from a supply roller (not shown in more detail).
  • This coating gap 2 is formed by a perforated cylinder 3, in particular a metal cylinder, and a counter-pressure roller 4.
  • the counter-pressure roller 4 is preferably made of elastic material.
  • the distance between the axis of rotation A of the counter-pressure roller 4 and the axis of rotation B of the cylinder 3 is smaller than the sum of the radii of the cylinder 3 and the counter-pressure roller 4.
  • the elastic counter-pressure roller 4 is deformed in the region of the coating gap 2 by the pressure of the cylinder 3. This deformation is of course also present if, in the narrower sense, no coating gap is formed between cylinder 3 and roller 4 without a substrate.
  • a coating head 5 presses against the inside surface 6 of the cylinder 3 from the inside of the cylinder 3.
  • a contact surface 8 is formed around an opening gap 7 of the coating head 5 on both sides of the opening gap 7, this contact surface 8 having a radius r 1, which is larger than the radius r of the cylinder 3.
  • the substrate 1 After the coating gap 2, the substrate 1 still runs a certain distance on the cylinder 3, then lifts off and loops around a roller 9.
  • the coating head 5 should be able to be subjected to heat by heating elements 10, this exposure being controlled by a control unit 11. Furthermore, a main chamber 12 is connected upstream of the orifice gap 7 in the coating head 5 and is connected via a corresponding connection channel 13 or supply line 14 to a source for molten substance (not shown). A 3-way valve 15 can be switched into line 14, via which line 14 is alternately connected to the source of coating substance or to a vacuum pump 16.
  • the cylinder 3 itself becomes a heat source.
  • the cylinder 3 becomes a resistor that heats itself through the connection.
  • the connection values should be around 2-10 volts and 700-900 A.
  • Slip contacts 18, which are only shown schematically, are suitable for transmitting the electrical energy. Appropriate insulation should then be provided towards the coating head 5 in the area of the contact surface 8.
  • the design of the cylinder 3 as an independent heat source has significant advantages in terms of quality, for example of the applied spot coating. At the points there are hardly any tails protruding upwards, as was the case with the coating processes known to date.
  • the coating substance Because of the mouth area of the coating head (no squeegee), the coating substance needs to have a lower moisture content. This is then evaporated faster and more completely by the heated cylinder, so that the liquid content of the substance can be drastically reduced. That is, the coating substance is already "baked" to a certain extent, which also increases the quality of the coating.
  • the area between cylinder 3 and roller 9 is associated with a device 19 for removing threads, which is only indicated schematically.
  • This device 19 can be designed mechanically, but it then has considerable disadvantages.
  • the "thread cutting" should preferably be done by heat, with every conceivable heat source being intended to be encompassed by the inventive concept.
  • a laser beam will preferably be used as a special heat source.
  • the absorption spectrum of this laser beam should correspond approximately to the emission spectrum of the coating substance, whereby the substance is also changed and influenced by the laser beam, i.e. in particular is networked. This in turn can increase the adhesive strength, the point is held together like a net and does not flow apart.
  • the roller 9 is to be followed by a heat zone 20 which is also only shown schematically.
  • a heat zone 20 which is also only shown schematically.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Coating Apparatus (AREA)

Description

Die Erfindung betrifft ein Verfahren zum Auftragen von flüssigen, pastösen oder plastischen Substanzen, insbesondere von Thermoplasten, auf ein Substrat, wobei die Substanz aufgeschmolzen, beheizt und durch einen Mündungsspalt eines Beschichtungskopfes und durch einen perforierten Zylinder auf das Substrat aufgebracht wird, welches dann von dem Zylinder abgehoben wird, sowie eine Vorrichtung hierfür.The invention relates to a method for applying liquid, pasty or plastic substances, in particular thermoplastics, to a substrate, the substance being melted, heated and applied to the substrate through an opening gap of a coating head and through a perforated cylinder, which is then removed from the substrate Cylinder is lifted off, as well as a device for this.

Eine derartige Vorrichtung ist beispielsweise aus der DE-A-36 38 307 entsprechend der WO 88/03442 bekannt. Um zu einem Ausbringen der Substanz aus dem Mündungsspalt des Beschichtungskopfes durch einen perforierten Zylinder hindurch auf das Substrat zu gelangen, ist es notwendig, daß die Substanz aufgeschmolzen bleibt, d.h., laufend mit Wärme versorgt wird. Gemäß der WO 88/03442 ist hierzu vorgesehen, daß der Beschichtungskopf selbst erwärmt wird, und daß um den Beschichtungskopf herum weitere regelbare Heizeinrichtungen vorgesehen sind, welche den Metallzylinder von innen mit Wärme beaufschlagen.Such a device is known for example from DE-A-36 38 307 corresponding to WO 88/03442. In order to bring the substance out of the mouth gap of the coating head through a perforated cylinder onto the substrate, it is necessary for the substance to remain melted, ie to be continuously supplied with heat. According to WO 88/03442, it is provided for this that the coating head itself is heated and that further adjustable ones are provided around the coating head Heating devices are provided which act on the metal cylinder with heat from the inside.

Aus der DE-U-33 13 088 ist ferner ein Druckwerk für eine Offsetrotationsdruckmaschine bekannt. Dabei werden Plattenzylinder durch Heizflüssigkeit aufgeheizt oder aber in einem Zylinder ist eine Widerstandsheizung vorgesehen. Im letzteren Fall sind auf einem Wellenabschnitt des Plattenzylinders zwei Schleifringe vorgesehen, an die je eine Stromversorgungsleitung, die zur Widerstandsheizung führen, gelegt ist. Die Schleifringe und die Stromversorgungsleitung sind gegeneinander und gegenüber dem Zylinder isoliert angeordnet.A printing unit for an offset rotary printing press is also known from DE-U-33 13 088. Plate cylinders are heated by heating fluid or resistance heating is provided in one cylinder. In the latter case, two slip rings are provided on a shaft section of the plate cylinder, to each of which a power supply line, which leads to resistance heating, is placed. The slip rings and the power supply line are insulated from each other and from the cylinder.

Aufgabe der vorliegenden Erfindung ist es, weitere Verbesserungen beim Aufbringen der aufgeschmolzenen Substanz auf das Substrat aufzuzeigen und die Beschichtungsqualität günstig zu beeinflussen.The object of the present invention is to show further improvements in the application of the molten substance to the substrate and to have a favorable influence on the coating quality.

Zur Lösung dieser Aufgabe führt, daß der Zylinder an eine Energiequelle angeschlossen und selbst als Wärmequelle für die Substanz ausgebildet wird.To achieve this object, the cylinder is connected to an energy source and is itself designed as a heat source for the substance.

Bei den bislang bekannten Verfahren wurde der Zylinder, welcher als Schablone für die Beschichtung dient, höchstens von außen oder innen mit Wärme bestrahlt. Grundsätzlicher Gedanke der vorliegenden Erfindung ist es dagegen, den Zylinder selbst als Wärmequelle auszubilden, wobei er bevorzugt an eine Stromquelle angeschlossen wird und dadurch als Widerstandsheizung dient. Hierdurch läßt sich die Erwärmung des Zylinders wesentlich genauer steuern, so daß auch die Auswirkungen der Erwärmung des Zylinders auf die Beschichtung selbst geregelt werden kann.In the previously known methods, the cylinder, which serves as a template for the coating, was at most irradiated with heat from outside or inside. The basic idea of the present invention, on the other hand, is to design the cylinder itself as a heat source, it preferably being connected to a power source and thereby serving as resistance heating. As a result, the heating of the cylinder can be controlled much more precisely, so that the effects of the heating of the cylinder on the coating itself can also be regulated.

In der Praxis hat sich erwiesen, daß durch die Erwärmung des Zylinders selbst ein wesentlicher Anteil der Flüssigkeit, die sich in der Beschichtungssubstanz befindet, ausgedampft wird und sogar die Beschichtungssubstanz "gebacken" oder gesintert wird. Hierdurch wird die Qualität der Beschichtung wesentlich verbessert und das Verfahren vereinfacht, da Trocknungsöfen entfallen können. Des weiteren kommt es beispielsweise bei Pasten in wesentlich geringerem Ausmaß zur Ausbildung von Fäden beim Abheben des beschichteten Substrates von dem Zylinder.In practice it has been found that the heating of the cylinder itself causes a substantial proportion of the liquid that is in the coating substance located, is evaporated and even the coating substance is "baked" or sintered. This significantly improves the quality of the coating and simplifies the process, since drying ovens can be dispensed with. Furthermore, for example in the case of pastes, threads form to a much lesser extent when the coated substrate is lifted off the cylinder.

Für den Anschluß des Metallzylinders an die Stromquelle wird bevorzugt ein Schleifkontakt verwendet.A sliding contact is preferably used to connect the metal cylinder to the power source.

Die Erfindung erfaßt aber auch den zusätzlichen Gedanken, daß nach dem Abheben des beschichteten Substrates vom Zylinder selbst die Fäden zwischen der Beschichtung und dem Zylinder beseitigt werden. Dies kann zum einen auf mechanischem Wege, beispielsweise durch Schneiden der Fäden, erfolgen. Bevorzugt wird jedoch Strahlung, beispielsweise Wärmestrahlung, die, in welcher Form auch immer, in den Bereich zwischen Zylinder und beschichtetem Substrat eingeführt bzw. eingestrahlt wird. Besonders erscheint hier eine Laserquelle als geeignet, welche die Fäden ohne weitere Schwierigkeiten beseitigt. Der Laser hat zudem, wenn er auf das beschichtete Substrat auftrifft, den Vorteil, daß er oberflächig die Beschichtungstropfen aufschmilzt und besser vernetzt. Auch hierdurch wird die Qualität der Beschichtung wesentlich verbessert. Zum Beseitigen der Fäden kann aber auch eine Zylinderlinse dienen, welche einen linienförmigen Focus erzeugt.However, the invention also covers the additional idea that after the coated substrate has been lifted off the cylinder itself, the threads between the coating and the cylinder are removed. On the one hand, this can be done mechanically, for example by cutting the threads. However, preference is given to radiation, for example thermal radiation, which, in whatever form, is introduced or radiated into the region between the cylinder and the coated substrate. A laser source which removes the threads without further difficulties appears to be particularly suitable here. The laser also has the advantage, when it strikes the coated substrate, that it melts the surface of the coating drops and cross-links them better. This also significantly improves the quality of the coating. A cylindrical lens, which generates a linear focus, can also be used to remove the threads.

Ferner hat sich in der Vergangenheit herausgestellt, daß sich beim beispielsweise punktförmigen Beschichten des Substrates beim Abheben vom Zylinder Schwänzchen an den Beschichtungspunkten ausbilden. Um diese Schwänzchen zu beseitigen, wird das beschichtete Substrat nach dem Abheben vom Zylinder durch eine Wärmezone geführt, was dazu führt, daß die Schwänzchen wieder in den Beschichtungstropfen hineingezogen werden. Welche Vorrichtung als Wärmezone verwendet wird, ist von untergeordneter Bedeutung.Furthermore, it has been found in the past that when coating the substrate, for example in a punctiform manner, tails form at the coating points when it is lifted off the cylinder. In order to remove these tails, the coated substrate, after being lifted off the cylinder, is passed through a heating zone, which leads to the tails dropping back into the coating be drawn in. Which device is used as a heating zone is of minor importance.

Üblicherweise findet das Belegen des beschichteten Substrates mit einer zusätzlichen Materialbahn erst nachträglich an die Beschichtung des Substrates statt, wobei dann wiederum dem beschichteten Substrat bzw. der Beschichtungssubstanz Wärme zugeführt werden muß, damit diese ihre Wirksamkeit zur Verbindung der Materialbahnen erlangt. Die vorliegende Erfindung umfaßt auch den Gedanken, daß das beschichtete Substrat sofort nach dem Abheben vom Zylinder mit der Materialbahn belegt wird, so daß ein zusätzlicher Arbeitsgang des Wiederaufwärmens oder Warmhaltens gespart ist. Hierzu dürfte es sich am günstigsten erweisen, wenn der Abhebewalze selbst ein entspechender Kalander zum Zuführen der Materialbahn zugeordnet ist.Usually, the coating of the coated substrate with an additional material web takes place only subsequently to the coating of the substrate, heat then having to be supplied to the coated substrate or the coating substance in order for it to be effective in connecting the material webs. The present invention also encompasses the idea that the coated substrate is covered with the material web immediately after it has been lifted off the cylinder, so that an additional operation of reheating or keeping warm is saved. For this purpose, it should prove to be most advantageous if the lifting roller itself is assigned a corresponding calender for feeding the material web.

Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung bevorzugter Ausführungsbeispiele sowie anhand der Zeichnung; diese zeigt in ihrer einzigen Figur eine schematische Darstellung einer erfindungsgemäßen Vorrichtung zum Auftragen von flüssigen, plastischen oder pastösen Substanzen auf ein Substrat, teilweise als Blockschaltbild, teilweise im Querschnitt dargestellt.Further advantages, features and details of the invention result from the following description of preferred exemplary embodiments and from the drawing; In its single figure, this shows a schematic representation of a device according to the invention for applying liquid, plastic or pasty substances to a substrate, partly as a block diagram, partly in cross section.

Ein zu beschichtendes Substrat 1 läuft von einer nicht näher gezeigten Vorratswalze in einen Beschichtungsspalt 2 ein. Dieser Beschichtungsspalt 2 wird von einem perforierten Zylinder 3, insbesondere einem Metallzylinder, und einer Gegendruckwalze 4 gebildet.A substrate 1 to be coated runs into a coating gap 2 from a supply roller (not shown in more detail). This coating gap 2 is formed by a perforated cylinder 3, in particular a metal cylinder, and a counter-pressure roller 4.

Die Gegendruckwalze 4 besteht bevorzugt aus elastischem Material. Der Abstand zwischen der Drehachse A der Gegendruckwalze 4 und der Drehachse B des Zylinders 3 ist kleiner als die Summe der Radien von Zylinder 3 und Gegendruckwalze 4. Hierdurch wird die elastische Gegendruckwalze 4 im Bereich des Beschichtungsspaltes 2 durch den Andruck des Zylinders 3 verformt. Diese Verformung ist natürlich auch dann gegeben, wenn im engeren Sinne ohne Substrat kein Beschichtungsspalt zwischen Zylinder 3 und Walze 4 gebildet ist.The counter-pressure roller 4 is preferably made of elastic material. The distance between the axis of rotation A of the counter-pressure roller 4 and the axis of rotation B of the cylinder 3 is smaller than the sum of the radii of the cylinder 3 and the counter-pressure roller 4. As a result, the elastic counter-pressure roller 4 is deformed in the region of the coating gap 2 by the pressure of the cylinder 3. This deformation is of course also present if, in the narrower sense, no coating gap is formed between cylinder 3 and roller 4 without a substrate.

Im Bereich des Beschichtungsspaltes 2 drückt vom Inneren des Zylinders 3 her ein Beschichtungskopf 5 gegen die Innenfläche 6 des Zylinders 3. Dabei wird um einen Mündungsspalt 7 des Beschichtungskopfes 5 eine Anlagefläche 8 beidseits des Mündungsspaltes 7 ausgebildet, wobei diese Anlagefläche 8 einen Radius r₁ aufweist, welcher größer ist als der Radius r des Zylinders 3. Hierdurch wird der Zylinder 3 in diesem Bereich in geringem Maße verformt, jedoch das Aufbringen der Substanz durch den Zylinder 3 verbessert, da gegenüber der Gegendruckwalze 5 eine ebenere Fläche ausgebildet wird.In the area of the coating gap 2, a coating head 5 presses against the inside surface 6 of the cylinder 3 from the inside of the cylinder 3. A contact surface 8 is formed around an opening gap 7 of the coating head 5 on both sides of the opening gap 7, this contact surface 8 having a radius r 1, which is larger than the radius r of the cylinder 3. As a result, the cylinder 3 is slightly deformed in this area, but the application of the substance by the cylinder 3 is improved, since a flat surface is formed in relation to the counter-pressure roller 5.

Nach dem Beschichtungsspalt 2 läuft das Substrat 1 noch über eine gewisse Strecke auf dem Zylinder 3, hebt dann ab und umschlingt eine Walze 9.After the coating gap 2, the substrate 1 still runs a certain distance on the cylinder 3, then lifts off and loops around a roller 9.

Im vorliegenden Ausführungsbeispiel soll der Beschichtungskopf 5 durch Heizelemente 10 mit Wärme beaufschlagbar sein, wobei diese Beaufschlagung durch eine Steuereinheit 11 kontrolliert wird. Ferner ist dem Mündungsspalt 7 im Beschichtungskopf 5 eine Hauptkammer 12 vorgeschaltet, welche über entsprechende Anschlußkanäle 13 bzw. Zuleitungen 14 mit einer nicht näher dargestellten Quelle für aufgeschmolzene Substanz in Verbindung steht. In die Leitung 14 kann ein 3-Wege-Ventil 15 eingeschaltet sein, über welches wechselweise die Leitung 14 mit der Quelle für Beschichtungssubstanz oder mit einer Vakuumpumpe 16 verbunden ist.In the present exemplary embodiment, the coating head 5 should be able to be subjected to heat by heating elements 10, this exposure being controlled by a control unit 11. Furthermore, a main chamber 12 is connected upstream of the orifice gap 7 in the coating head 5 and is connected via a corresponding connection channel 13 or supply line 14 to a source for molten substance (not shown). A 3-way valve 15 can be switched into line 14, via which line 14 is alternately connected to the source of coating substance or to a vacuum pump 16.

In dem vorliegenden Ausführungsbeispiel ist erfindungsgemäß vorgesehen, daß der Zylinder 3 selbst zur Wärmequelle wird. Durch einen Anschluß an elektrische Anschlüsse 17 wird der Zylinder 3 zu einem Widerstand, der sich durch den Anschluß selbst erwärmt. Die Anschlußwerte dürften etwa bei 2-10 Volt und 700-900 A liegen. Zur Übertragung der elektrischen Energie bieten sich Schleifkontakte 18 an, welche nur schematisch dargestellt sind. Zum Beschichtungskopf 5 hin sollte dann im Bereich der Anlagefläche 8 eine entsprechende Isolierung vorhanden sind.In the present embodiment it is provided according to the invention that the cylinder 3 itself becomes a heat source. By connecting to electrical connections 17, the cylinder 3 becomes a resistor that heats itself through the connection. The connection values should be around 2-10 volts and 700-900 A. Slip contacts 18, which are only shown schematically, are suitable for transmitting the electrical energy. Appropriate insulation should then be provided towards the coating head 5 in the area of the contact surface 8.

Die Ausbildung des Zylinders 3 als eigenständige Wärmequelle hat wesentliche Vorteile bezüglich der Qualität, beispielsweise von aufgetragener Punktbeschichtung. Es bilden sich bei den Punkten kaum noch nach oben wegstehende Schwänzchen, wie dies bei den bislang bekannten Beschichtungsverfahren der Fall war.The design of the cylinder 3 as an independent heat source has significant advantages in terms of quality, for example of the applied spot coating. At the points there are hardly any tails protruding upwards, as was the case with the coating processes known to date.

Ferner wird, was die Praxis gezeigt hat, eine Fadenbildung zwischen Zylinder 3 und der Beschichtung des abgehobenen Substrates vermindert.Furthermore, what has been shown in practice, thread formation between cylinder 3 and the coating of the lifted substrate is reduced.

Wegen des Mündungsbereiches des Beschichtungskopfes (keine Rakel) braucht die Beschichtungssubstanz schon einen geringeren Feuchtigkeitsgehalt aufzuweisen. Dieser wird dann durch den beheizten Zylinder bereits auch schneller und vollständiger ausgedampft, so daß der Flüssigkeitsgehalt der Substanz drastisch reduziert werden kann. D.h., die Beschichtungssubstanz wird im gewissen Umfang bereits "gebacken", was ebenfalls die Qualität der Beschichtung erhöht.Because of the mouth area of the coating head (no squeegee), the coating substance needs to have a lower moisture content. This is then evaporated faster and more completely by the heated cylinder, so that the liquid content of the substance can be drastically reduced. That is, the coating substance is already "baked" to a certain extent, which also increases the quality of the coating.

Erfindungsgemäß ist dem Bereich zwischen Zylinder 3 und Walze 9 eine nur schematisch angedeutete Einrichtung 19 zum Beseitigen von Fäden zugeordnet. Diese Einrichtung 19 kann einmal mechanisch ausgebildet sein, wobei sie aber dann mit erheblichen Nachteilen behaftet ist. Bevorzugt soll das "Fadenschneiden" durch Wärme geschehen, wobei jede denkbare Wärmequelle vom Erfindungsgedanken umfaßt sein soll. Allerdings wird auch hier wiederum als besondere Wärmequelle ein Laserstrahl bevorzugt zur Anwendung kommen. Das Absorptionsspektrum dieses Laserstrahls soll etwa dem Emissionspektrum der Beschichtungssubstanz entsprechen, wodurch zudem die Substanz durch den Laserstrahl verändert und beeinflußt, d.h. insbesondere vernetzt wird. Dies kann wiederum eine Erhöhung der Klebekraft bewirken, der Punkt wird wie mit einem Netz zusammengehalten und fließt nicht auseinander.According to the invention, the area between cylinder 3 and roller 9 is associated with a device 19 for removing threads, which is only indicated schematically. This device 19 can be designed mechanically, but it then has considerable disadvantages. The "thread cutting" should preferably be done by heat, with every conceivable heat source being intended to be encompassed by the inventive concept. However, here too, a laser beam will preferably be used as a special heat source. The absorption spectrum of this laser beam should correspond approximately to the emission spectrum of the coating substance, whereby the substance is also changed and influenced by the laser beam, i.e. in particular is networked. This in turn can increase the adhesive strength, the point is held together like a net and does not flow apart.

In einem weiteren Ausführungsbeispiel der Erfindung soll der Walze 9 eine ebenfalls nur schematisch dargestellte Wärmezone 20 nachgeschaltet sein. Wie oben erwähnt, bilden sich beispielsweise bei der Punktbeschichtung durch eine thermoplastische Substanz auf den Punkten kleine Schwänzchen. Es hat sich herausgestellt, daß beim Durchführen des beschichteten Substrates 1 durch eine Wärmezone 20 diese Schwänzchen eingezogen werden und auch hierdurch die Qualität der Beschichtung wiederum wesentlich verbessert wird.In a further exemplary embodiment of the invention, the roller 9 is to be followed by a heat zone 20 which is also only shown schematically. As mentioned above, small dots are formed on the dots, for example, when a thermoplastic substance is used to coat the spots. It has been found that the When the coated substrate 1 is passed through a heat zone 20, these tails are drawn in and the quality of the coating is in turn significantly improved as a result.

Ferner kann erfindungsgemäß vorgesehen sein, der Walze 9 einen Kalander 21 zuzuordnen, welcher eine weitere, mit dem beschichteten Substrat 1 zu verbindende Materialbahn 22 zuführt. Hierdurch erfolgt ein weiterer Schritt zur Verbesserung der Automatisation, da ein späteres, neuerliches Aufschmelzen bzw. Erwärmen der auf das Substrat aufgebrachten Substanz sich erübrigt.Furthermore, it can be provided according to the invention to assign a calender 21 to the roller 9, which feeds a further material web 22 to be connected to the coated substrate 1. This takes a further step to improve the automation, since there is no need to re-melt or heat the substance applied to the substrate later.

Claims (9)

  1. Process for applying liquid, pasty or plastic substances, in particular thermoplastics, to a substrate (1), wherein the substance is melted, heated and applied to the substrate (1) through an orifice gap (7) in a coating head (5) and through a perforated cylinder (3), the substrate (1) then being removed from the cylinder (3), characterised in that the cylinder (3) is attached to a power source and is itself designed as a heat source for the substance.
  2. Process according to claim 1, characterised in that after the coated substrate (1) has been removed from the cylinder (3), threads between the coating and the cylinder (3) are eliminated.
  3. Process according to claim 1 or 2, characterised in that the coated substrate (1) is guided through a heating zone (20) after being removed from the cylinder (3).
  4. Process according to one of claims 1 to 3, characterised in that the coated substrate is connected to a strip of material immediately after being removed from the cylinder (3).
  5. Process according to at least one of claims 1 to 4, characterised in that the perforations in the cylinder (3) are evacuated before the orifice gap (7) is travelled over.
  6. Device for applying liquid, pasty or plastic substances, in particular thermoplastics, to a substrate (1) with an arrangement for melting these substances and a coating head (5) for transferring the molten substances to the substrate (1) through a perforated cylinder (3) which, together with an opposing pressure roller (4), forms a coating gap (8) after which the substrate (1) is withdrawn while partially looping a roller (9) or the like, characterised in that the cylinder (3) is attached directly to a current source (17).
  7. Device according to claim 6, characterised in that the cylinder (3) is connected to the current source (17) via sliding contacts (18).
  8. Device according to claim 6 or 7, characterised in that the region where the coated substrate (1) is removed from the cylinder (3) is allocated an arrangement (19) for eliminating threads.
  9. Device according to claim 8, characterised in that the arrangement (19) consists of a laser, a focal glass or a cylindrical lens with linear focussing.
EP90102857A 1989-02-22 1990-02-14 Process and device for applying liquid, pasty or plastic substances to a substrate Expired - Lifetime EP0384278B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3905342 1989-02-22
DE3905342A DE3905342A1 (en) 1989-02-22 1989-02-22 METHOD AND DEVICE FOR APPLYING LIQUID, PASTOESE OR PLASTIC SUBSTANCES TO A SUBSTRATE

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EP0384278A2 EP0384278A2 (en) 1990-08-29
EP0384278A3 EP0384278A3 (en) 1991-12-04
EP0384278B1 true EP0384278B1 (en) 1994-12-14

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EP90102857A Expired - Lifetime EP0384278B1 (en) 1989-02-22 1990-02-14 Process and device for applying liquid, pasty or plastic substances to a substrate

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US (1) US5122219A (en)
EP (1) EP0384278B1 (en)
DE (2) DE3905342A1 (en)

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US5392498A (en) * 1992-12-10 1995-02-28 The Proctor & Gamble Company Non-abrasive skin friendly mechanical fastening system
US5300058A (en) * 1992-12-10 1994-04-05 The Procter & Gamble Company Disposable absorbent article having an improved mechanical fastening system
US6139479A (en) * 1998-02-23 2000-10-31 Reynolds Consumer Products, Inc. Apparatus and method for manufacture of containers of variable length
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EP1214468A1 (en) 1999-09-21 2002-06-19 Microfibres, Inc. Embossed and printed flocked fabrics and methods for making the fabrics
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DE10020101A1 (en) * 2000-04-22 2001-10-25 Beiersdorf Ag Deposition of a high viscosity fluid or paste onto a carrier material uses a screen printing process
DE10037549A1 (en) 2000-08-02 2002-02-14 Beiersdorf Ag Method and device for applying hotmelt pressure sensitive adhesives to a carrier material
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TW201249633A (en) * 2011-06-03 2012-12-16 jie-han Lin Resin filling device, mold, and method thereof
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CN109501445A (en) * 2018-11-19 2019-03-22 磐安县宸熙工艺品有限公司 A kind of indigo printing fabric production equipment
CN109484005A (en) * 2018-11-21 2019-03-19 磐安县宸熙工艺品有限公司 A kind of system for removing paddle for indigo printing fabric automatic sizing
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Also Published As

Publication number Publication date
DE3905342A1 (en) 1990-08-23
EP0384278A3 (en) 1991-12-04
US5122219A (en) 1992-06-16
DE59007967D1 (en) 1995-01-26
EP0384278A2 (en) 1990-08-29

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