EP0366962A2 - Slot nozzle - Google Patents

Slot nozzle Download PDF

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Publication number
EP0366962A2
EP0366962A2 EP89118397A EP89118397A EP0366962A2 EP 0366962 A2 EP0366962 A2 EP 0366962A2 EP 89118397 A EP89118397 A EP 89118397A EP 89118397 A EP89118397 A EP 89118397A EP 0366962 A2 EP0366962 A2 EP 0366962A2
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EP
European Patent Office
Prior art keywords
slot
valve
nozzle body
shut
nozzle according
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.)
Granted
Application number
EP89118397A
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German (de)
French (fr)
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EP0366962B1 (en
EP0366962A3 (en
Inventor
Henning J. Claassen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nordson Corp
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Nordson Corp
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Filing date
Publication date
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Publication of EP0366962A2 publication Critical patent/EP0366962A2/en
Publication of EP0366962A3 publication Critical patent/EP0366962A3/en
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Publication of EP0366962B1 publication Critical patent/EP0366962B1/en
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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
    • B05C5/0254—Coating heads with slot-shaped outlet
    • B05C5/0258—Coating heads with slot-shaped outlet flow controlled, e.g. by a valve

Definitions

  • the invention relates to a slot nozzle for applying a liquid, high polymer material, in particular a hot melt adhesive based on polyurethane, of the type specified in the preamble of claim 1.
  • Such a slot nozzle is apparent from DE-PS 35 41 784 and has a nozzle body, a feed channel for the liquid material in the nozzle body, a controllable shut-off valve in the feed channel, a spreading chamber which adjoins the feed channel in the direction of flow, and one with the slit connected to the spreading chamber so that a closed layer of the liquid, high-polymer material can be applied to the substrate to be coated, usually a web that is moved under the nozzle body.
  • Hot melt adhesive based on polyurethane
  • a hot melt adhesive can react very quickly (“cracking") upon contact with water, in particular even at high atmospheric humidity, so that very short processing times are sought here.
  • Unprocessed hotmelt adhesive such as can accumulate in so-called dead spaces of a slot nozzle, changes rapidly and hardens, so that in extreme cases the slot nozzle becomes unusable.
  • the invention is therefore based on the object to provide a slot nozzle of the type specified, in which the disadvantages mentioned above do not occur.
  • a slotted nozzle which, on the one hand, guarantees a perfect tear-off and, on the other hand, largely prevents the liquid, high-polymer material from reacting prematurely.
  • the liquid, highly polymeric material flows in a straight line through the feed channel with the shut-off valve into the spreading chamber and is then only diverted into the outlet slot, so that there are practically no dead spaces and thus the reaction of relevant amounts of material in such dead spaces is excluded.
  • the shut-off valve is therefore not, as in the prior art, in its own application head connected to the nozzle body, but in the nozzle body itself, so that a very compact structure results.
  • This spatial arrangement contributes to the fact that the liquid, highly polymeric material can get from the feed channel via the spreading chamber into the outlet slot without significant kinks. It has proven to be advantageous if the distance between the shut-off point on the one hand and the entry into the distribution channel on the other hand is a maximum of 50 mm; very good results are obtained with a distance of about 25 mm.
  • the basic structure of the nozzle body known from DE-PS 35 41 784 can be used for this slot nozzle, in particular the structure of two parts which are connected to one another, in particular screwed together.
  • the feed channel with the shut-off valve extends through a nozzle body part, while the outlet slot is located in the interfaces between the two parts and is formed either by a so-called "mask plate” or by a milling in one of the two surfaces of the two nozzle body parts.
  • the spreading chamber can either be in the same nozzle body part as the feed channel or in the other nozzle body part. It only has to be ensured that the liquid, highly polymeric material flows as straight as possible from the feed channel via the spreading chamber into the outlet slot.
  • the slot nozzle shown in FIG. 1, generally indicated by the reference numeral 10, has a nozzle body which consists of two plate-shaped parts 12 and 14 screwed together.
  • nozzle body which consists of two plate-shaped parts 12 and 14 screwed together.
  • two connecting screws 16 can be seen, the heads of which are countersunk in the surface of part 14.
  • the nozzle body is provided with holes in which heating cartridges are located. Such a bore is indicated by reference number 18. As a rule, several heating holes with heating cartridges are provided, in both parts 12, 14.
  • a transverse channel 18 extends, which runs perpendicular to the cutting plane in FIG. 1, has a circular cross section and is connected to a melting device (not shown) which connects the usually solid or at least viscous, high polymer material, in particular a hot melt adhesive based on polyurethane, melts and supplies the cross channel 18 under pressure.
  • shut-off valves 20 Several bores run at right angles to this transverse channel 18, are used in the shut-off valves 20; Although only one shut-off valve 20 is shown in the sectional view according to FIG. 1, several shut-off valves 20 are generally used, as can also be seen from FIG. 2, which indicates a total of four shut-off valves 20.
  • Each shut-off valve 20 consists of a valve body 22 which is inserted into the bore of part 12 and has a bore in which a valve needle 24 can be pushed back and forth.
  • the valve needle 24 is provided at its upper end with a piston 26 which is located in a piston chamber 28; the piston chamber has two compressed air connections, to which compressed air is alternately supplied in the direction of the arrows; as a result, the two surfaces of the piston 26 are acted upon alternately by compressed air, so that the piston 26 and thus the valve needle 24 are pushed back and forth pneumatically.
  • valve body 22 ends somewhat above the transverse bore 18, a hole is formed surrounding the transverse bore 18, the bottom of which is covered with an exchangeable, plate-shaped seat 32 for the valve needle 24.
  • the seat 32 has a bore 34 aligned with the bore for the valve needle 24 in the valve body 22, so that the tip of the valve needle 24 penetrates into the bore 34 in the seat 32 at one end of its stroke and closes it. This position is indicated in Figure 1.
  • valve needle 24 clears the bore 34 in the seat 32 so that the liquid, highly polymeric thermoplastic material can flow from the transverse bore 18 through the hole 19 into the bore 34 of the seat 32.
  • an elongated spreading chamber 37 which extends almost over the entire length of the nozzle body from the two parts 12, 14 and is also aligned with the bores 36, so that the liquid, highly polymeric thermoplastic material is in a straight line from the hole 19th can flow into the spreading chamber 37 via the bore 34 in the seat 32 and the bore 36 in the part 12 and is thereby distributed uniformly over almost the entire length of the nozzle body 12, 14.
  • the actual outlet slot 38 is arranged between the two adjacent end faces of the two parts 12, 14, which in the embodiment shown is formed by milling in the end face of the part 14.
  • the slot can also be formed by a so-called “mask sheet”, that is to say a piece of sheet metal clamped between the two parts 12, 14 with a recess forming the slot.
  • the slot 38 extends in any case from the lower edge of the nozzle body 12, 14 up to the expansion chamber 37.
  • the lower surfaces of the two parts 12, 14 are chamfered in the usual way; in addition, the lower edge of the left part 12 facing the exit slot 38 is slightly advanced (at 48), so that a tear-off edge is formed.
  • the slot nozzle 10 receives the liquefied, high polymer, thermoplastic material, in particular a hot melt adhesive based on polyurethane, under pressure from a liquefaction device via the transverse bore 18; from the transverse bore 18 the material reaches the various holes 19 and is under pressure there, since in the position shown in FIG. 1 the tip of the valve needle 24 is in the outlet bore 34 of the seat 32 and the bore 36 is thus blocked.
  • thermoplastic material in particular a hot melt adhesive based on polyurethane
  • the piston 26 By acting on the surface of the piston 26 facing the valve body 22, the piston 26 is pneumatically displaced upward, so that the valve needle 24 moves upward and thus clears the bore 34, so that the liquid, highly polymeric thermoplastic material through the bore 34 in the seat 32, the bore 36 and the expansion chamber 37 can reach the outlet slot 38 over the entire length.
  • valve needle 24 By acting on the surface of the piston 26 facing away from the valve body 22 with compressed air, the valve needle 24 is moved downward again, thereby blocking the bore 34, so that the application of the high-polymer material is interrupted.
  • valves four in the embodiment shown, can be provided, each of which supplies parts of the spreading chamber 37 with the liquid, high-polymer material.
  • the spreading chamber 37 can also be located in the end face of the part 12; it is only essential that the liquid, highly polymeric material coming from the individual bores 36 is distributed uniformly over the entire length of the spreading chamber 37 and thus of the outlet slot 38.
  • the material After leaving the transverse bore 18, the material flows in a straight line over a short distance from the hole 19 through the bores 34, 36 into the spreading chamber 37; the bending at the transition from the expansion chamber 37 into the slot 38 is only slight, since the bore 36 and slot 38 run at an angle of 120 ° to one another.
  • FIG. 3 shows part 14 with the spreading chamber 37 and the cutout forming the outlet slot 38 in the end face of part 14.
  • FIG. 2 shows a perspective side view of the nozzle body with the two parts 12, 14, four schematically indicated shut-off valves 20, the spreading chamber 37 and the outlet slot 38.

Landscapes

  • Coating Apparatus (AREA)
  • Nozzles (AREA)
  • Percussion Or Vibration Massage (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

A slot nozzle for applying a liquid, high-polymeric material, in particular a polyurethane-based hot-melt adhesive, with a nozzle body, a feed channel for the liquid material in the nozzle body, a controllable shut-off valve, an expansion chamber adjoining the feed channel and with an outlet slot connected to the expansion chamber, has a shut-off valve which is integrated in the nozzle body; the liquid, high-polymeric material flows over a substantially straight section from the shut-off valve through a short feed channel into the expansion chamber. <IMAGE>

Description

Die Erfindung betrifft eine Schlitzdüse zum Auftragen eines flüssigen, hochpolymeren Werkstoffes, insbesondere eines Schmelzklebstoffes auf der Basis von Polyurethan, der im Oberbegriff des Anspruchs 1 angege­benen Gattung.The invention relates to a slot nozzle for applying a liquid, high polymer material, in particular a hot melt adhesive based on polyurethane, of the type specified in the preamble of claim 1.

Eine solche Schlitzdüse geht aus der DE-PS 35 41 784 hervor und weist einen Düsenkorper, einen Zuführkanal für den flüssigen Werkstoff in dem Düsenkörper, ein steuerbares Absperrventil in dem Zuführkanal, eine Ausbreitkammer, die sich in Strömungsrichtung an den Zuführkanal an­schließt, sowie einen mit der Ausbreitkammer verbundenen Austritts­schlitz auf, so daß eine geschlossene Schicht des flüssigen, hochpoly­meren Werkstoffes auf das zu beschichtende Substrat, meist eine Bahn, die unter dem Düsenkörper vorbeibewegt wird, aufgebracht werden kann.Such a slot nozzle is apparent from DE-PS 35 41 784 and has a nozzle body, a feed channel for the liquid material in the nozzle body, a controllable shut-off valve in the feed channel, a spreading chamber which adjoins the feed channel in the direction of flow, and one with the slit connected to the spreading chamber so that a closed layer of the liquid, high-polymer material can be applied to the substrate to be coated, usually a web that is moved under the nozzle body.

Bei dieser Schlitzdüse treten dann Schwierigkeiten auf, wenn bei inter­mittierenden Betrieb mit hohen Schaltfrequenzen gearbeitet werden muß, da dann der gewünschte, einwandfreie Abriß am Austrittsschlitz nicht mehr gewährleistet ist. Der auf das zu beschichtende Substrat aufge­brachte Werkstoff zeigt dann unschöne Muster, die zu Problemen bei der weiteren Handhabung führen können.Difficulties arise with this slot nozzle if it is necessary to work with high switching frequencies in intermittent operation, since then the desired, perfect tearing at the outlet slot is not more is guaranteed. The material applied to the substrate to be coated then shows unsightly patterns which can lead to problems in further handling.

Eine weitere Schwierigkeit tritt beim Auftragen eines Schmelzklebstof­fes auf der Basis von Polyurethan auf; denn ein solcher Schmelzkleb­stoff kann bei Kontakt mit Wasser, insbesondere bereits bei hoher Luft­feuchtigkeit, sehr rasch reagieren ("Cracken"), so daß hier sehr kurze Verarbeitungszeiten angestrebt werden. Nicht verarbeiteter Schmelz­klebstoff, wie er sich bspw. in sogenannten Toträumen einer Schlitz­düse ansammeln kann, verändert sich rasch und härtet aus, so daß im Extremfall die Schlitzdüse unbrauchbar wird.Another difficulty arises when applying a hot melt adhesive based on polyurethane; because such a hot melt adhesive can react very quickly ("cracking") upon contact with water, in particular even at high atmospheric humidity, so that very short processing times are sought here. Unprocessed hotmelt adhesive, such as can accumulate in so-called dead spaces of a slot nozzle, changes rapidly and hardens, so that in extreme cases the slot nozzle becomes unusable.

Der Erfindung liegt deshalb die Aufgabe zugrunde, eine Schlitzdüse der angegebenen Gattung zu schaffen, bei der die oben erwähnten Nachteile nicht auftreten.The invention is therefore based on the object to provide a slot nozzle of the type specified, in which the disadvantages mentioned above do not occur.

Insbesondere soll eine Schlitzdüse vorgeschlagen werden, die einer­seits einen einwandfreien Abriß gewährleistet und andererseits das vor­zeitige Ausreagieren des flüssigen, hochpolymeren Werkstoffes weit­gehend verhindert.In particular, a slotted nozzle is to be proposed which, on the one hand, guarantees a perfect tear-off and, on the other hand, largely prevents the liquid, high-polymer material from reacting prematurely.

Dies wird erfindungsgemäß durch die im kennzeichnenden Teil des An­spruchs 1 angegebenen Merkmale gelöst.This is achieved according to the invention by the features specified in the characterizing part of claim 1.

Zweckmäßige Ausführungsformen werden durch die Merkmale der Unteran­sprüche definiert.Appropriate embodiments are defined by the features of the subclaims.

Die mit der Erfindung erzielten Vorteile beruhen auf der Erkenntnis, daß die bisher üblichen, langen Fließwege von dem Absperrventil im Auf­tragkopf zum Austrittsschlitz die Strömung des flüssigen Werkstoffes so stark beeinflussen, daß der angestrebte, einwandfreie Abriß nicht mehr gewährleistet ist. Deshalb wird vorgeschlagen, den Zuführkanal in unmittelbarer Nähe des Austrittsschlitzes enden zu lassen und gleich­zeitig auch das Absperrventil in unmittelbarer Nähe des Austritts­schlitzes, nämlich im Düsenkörper, anzuordnen, so daß der aus dem Zuführkanal austretende, flüssige Werkstoff sofort in die Aus­ breitkammer und damit in die Schlitzdüse gelangt, also jede relevante Beeinflussung des Strömungsvorgangs auf dieser kurzen Strecke ausge­schlossen werden kann. Dadurch ergeben sich definierte Verhältnisse, die wiederum zu einem einwandfreien Abriß führen.The advantages achieved with the invention are based on the knowledge that the previously long flow paths from the shut-off valve in the application head to the outlet slot influence the flow of the liquid material so strongly that the desired, faultless demolition is no longer guaranteed. It is therefore proposed to let the feed channel end in the immediate vicinity of the outlet slot and at the same time to arrange the shut-off valve in the immediate vicinity of the outlet slot, namely in the nozzle body, so that the liquid material emerging from the feed channel immediately into the off wide chamber and thus into the slot nozzle, so any relevant influence on the flow process can be ruled out over this short distance. This results in defined conditions, which in turn lead to a perfect demolition.

Dazu trägt auch bei, daß genau definierte Temperatur-Bedingungen einge­stellt werden können und der flüssige hochpolymere Werkstoff mit einer definierten Temperatur von dem Zuführkanal über die Ausbreitkammer in den Austrittsschlitz gelangt, wie es für einen einwandfreien, insbe­sondere intermittierenden Betrieb erforderlich ist.This also contributes to the fact that precisely defined temperature conditions can be set and that the liquid, high-polymer material with a defined temperature reaches the outlet slot via the spreading chamber, as is necessary for perfect, in particular intermittent operation.

Der flüssige, hochpolymere Werkstoff strömt auf einer geraden Linie durch den Zuführkanal mit dem Absperrventil in die Ausbreitkammer und wird dann erst in den Austrittsschlitz umgelenkt, so daß praktisch keine Toträume verhanden sind und damit das Ausreagieren relevanter Werkstoff-Mengen in solchen Toträumen ausgeschlossen wird.The liquid, highly polymeric material flows in a straight line through the feed channel with the shut-off valve into the spreading chamber and is then only diverted into the outlet slot, so that there are practically no dead spaces and thus the reaction of relevant amounts of material in such dead spaces is excluded.

Das Absperrventil befindet sich also nicht, wie beim Stand der Technik, in einem eigenen, mit dem Dusenkörper verbundenen Auftragkopf, sondern in dem Düsenkörper selbst, so daß sich ein sehr kompakter Aufbau er­gibt. Diese räumliche Anordnung trägt dazu bei, daß der flüssige, hoch­polymere Werkstoff ohne wesentliche Abknickungen von dem Zuführkanal über die Ausbreitkammer in den Austrittsschlitz gelangen kann. Es hat sich als günstig herausgestellt, wenn der Abstand zwischen der Absperr­stelle einerseits und dem Eintritt in den Verteilerkanal andererseits maximal 50 mm beträgt; sehr gute Ergebnisse werden mit einem Abstand von etwa 25 mm erhalten.The shut-off valve is therefore not, as in the prior art, in its own application head connected to the nozzle body, but in the nozzle body itself, so that a very compact structure results. This spatial arrangement contributes to the fact that the liquid, highly polymeric material can get from the feed channel via the spreading chamber into the outlet slot without significant kinks. It has proven to be advantageous if the distance between the shut-off point on the one hand and the entry into the distribution channel on the other hand is a maximum of 50 mm; very good results are obtained with a distance of about 25 mm.

Für diese Schlitzdüse kann im Prinzip der aus der DE-PS 35 41 784 be­kannte Grundaufbau des Düsenkörpers verwendet werden, also insbesondere der Aufbau aus zwei Teilen, die miteinander verbunden, insbesondere verschraubt sind. Der Zuführkanal mit dem Absperrventil erstreckt sich durch einen Düsenkörper-Teil, während sich der Austrittsschlitz in den Grenzflächen zwischen den beiden Teilen befindet und entweder durch ein sogenanntes "Maskenblech" oder durch eine Ausfräsung in einer der bei­den Flächen der beiden Düsenkörper-Teile gebildet wird.In principle, the basic structure of the nozzle body known from DE-PS 35 41 784 can be used for this slot nozzle, in particular the structure of two parts which are connected to one another, in particular screwed together. The feed channel with the shut-off valve extends through a nozzle body part, while the outlet slot is located in the interfaces between the two parts and is formed either by a so-called "mask plate" or by a milling in one of the two surfaces of the two nozzle body parts.

Die Ausbreitkammer kann sich entweder in dem gleichen Düsenkörper-Teil wie der Zuführkanal oder in den anderem Dusenkörper-Teil befinden. Es muß nur gewährleistet sein, daß der flüssige, hochpolymere Werkstoff möglichst geradlinig von dem Zuführkanal über die Ausbreitkammer in den Austrittsschlitz strömt.The spreading chamber can either be in the same nozzle body part as the feed channel or in the other nozzle body part. It only has to be ensured that the liquid, highly polymeric material flows as straight as possible from the feed channel via the spreading chamber into the outlet slot.

Die Erfindung wird im folgenden anhand eines Ausführungsbeispiels unter Bezugnahme auf die beiliegenden, schematischen Zeichnungen näher er­läutert. Es zeigen

  • Fig. 1 einen vertikalen Schnitt durch die Schlitzdüse,
  • Fig. 2 eine perspektivische Ansicht der Schlitzdüse, und
  • Fig. 3 eine perspektivische Ansicht eines Teils des Düsenkörpers.
The invention is explained below using an exemplary embodiment with reference to the accompanying schematic drawings. Show it
  • 1 is a vertical section through the slot nozzle,
  • Fig. 2 is a perspective view of the slot nozzle, and
  • Fig. 3 is a perspective view of part of the nozzle body.

Die aus Figur 1 ersichtliche, allgemein durch das Bezugszeichen 10 an­gedeutete Schlitzdüse weist einen Düsenkörper auf, der aus zwei mit­einander verschraubten, plattenförmigen Teilen 12 und 14 besteht. In Figur 1 sind zwei Verbindungsschrauben 16 ersichtlich, deren Köpfe in die Fläche des Teils 14 versenkt sind.The slot nozzle shown in FIG. 1, generally indicated by the reference numeral 10, has a nozzle body which consists of two plate-shaped parts 12 and 14 screwed together. In Figure 1, two connecting screws 16 can be seen, the heads of which are countersunk in the surface of part 14.

Der Düsenkörper ist mit Bohrungen versehen, in denen sich Heizpatronen befinden. Eine solche Bohrung ist durch das Bezugszeichen 18 angedeu­tet. In der Regel sind mehrere Heiz-Bohrungen mit Heiz-Patronen vor­gesehen, und zwar in beiden Teilen 12, 14.The nozzle body is provided with holes in which heating cartridges are located. Such a bore is indicated by reference number 18. As a rule, several heating holes with heating cartridges are provided, in both parts 12, 14.

Durch einen der beiden Teile 12, 14, bei der dargestellten Ausführungs­form durch den Teil 12, erstreckt sich ein Querkanal 18, der senkrecht zur Schnittebene in Figur 1 verläuft, einen kreisförmigen Querschnitt hat und an ein Aufschmelzgerät (nicht dargestellt) angeschlossen ist, das den in der Regel festen oder zumindest zähflüssigen, hochpolymeren Werkstoff, insbesondere einen Schmelzklebstoff auf der Basis von Poly­urethan, aufschmilzt und dem Querkanal 18 unter Druck zuführt.Through one of the two parts 12, 14, in the embodiment shown by the part 12, a transverse channel 18 extends, which runs perpendicular to the cutting plane in FIG. 1, has a circular cross section and is connected to a melting device (not shown) which connects the usually solid or at least viscous, high polymer material, in particular a hot melt adhesive based on polyurethane, melts and supplies the cross channel 18 under pressure.

Im rechten Winkel zu diesem Querkanal 18 verlaufen mehrere Bohrungen, in die Absperrventile 20 eingesetzt sind; obwohl in der Schnittdar­stellung nach Figur 1 nur ein Absperrventil 20 dargestellt ist, wer­den in der Regel mehrere Absperrventile 20 verwendet, wie man auch aus Figur 2 erkennt, die insgesamt vier Absperrventile 20 andeutet.Several bores run at right angles to this transverse channel 18, are used in the shut-off valves 20; Although only one shut-off valve 20 is shown in the sectional view according to FIG. 1, several shut-off valves 20 are generally used, as can also be seen from FIG. 2, which indicates a total of four shut-off valves 20.

Jedes Absperrventil 20 besteht aus einem in die Bohrung des Teils 12 eingesetzten Ventilkörper 22 mit einer Bohrung, in der eine Ventilnadel 24 hin- und hergeschoben werden kann. Die Ventilnadel 24 ist an ihrem oberen Ende mit einem Kolben 26 versehen, der sich in einer Kolbenkam­mer 28 befindet; die Kolbenkammer weist zwei Druckluftanschlüsse auf, denen in Richtung der Pfeile abwechselnd Druckluft zugeführt wird; da­durch werden die beiden Flächen des Kolbens 26 abwechselnd durch Druck­luft beaufschlagt, so daß der Kolben 26 und damit die Ventilnadel 24 pneumatisch hin- und herverschoben wird.Each shut-off valve 20 consists of a valve body 22 which is inserted into the bore of part 12 and has a bore in which a valve needle 24 can be pushed back and forth. The valve needle 24 is provided at its upper end with a piston 26 which is located in a piston chamber 28; the piston chamber has two compressed air connections, to which compressed air is alternately supplied in the direction of the arrows; as a result, the two surfaces of the piston 26 are acted upon alternately by compressed air, so that the piston 26 and thus the valve needle 24 are pushed back and forth pneumatically.

Am oberen Ende des Absperrventils 20 befindet sich ein Einstellknopf 30 für den Hub der Ventilnadel 24.At the upper end of the shut-off valve 20 there is an adjustment button 30 for the stroke of the valve needle 24.

Da der Ventilkörper 22 etwas über der Querbohrung 18 endet, entsteht ein die Querbohrung 18 umgebendes Loch, deren Boden mit einem aus­tauschbaren, plattenförmigen Sitz 32 für die Ventilnadel 24 bedeckt ist. Der Sitz 32 hat eine mit der Bohrung für die Ventilnadel 24 in dem Ventilkörper 22 fluchtende Bohrung 34, so daß die Spitze der Ventil­nadel 24 an einem Ende ihres Hubes in die Bohrung 34 in dem Sitz 32 eindringt und diese verschließt. Diese Lage ist in Figur 1 angedeutet.Since the valve body 22 ends somewhat above the transverse bore 18, a hole is formed surrounding the transverse bore 18, the bottom of which is covered with an exchangeable, plate-shaped seat 32 for the valve needle 24. The seat 32 has a bore 34 aligned with the bore for the valve needle 24 in the valve body 22, so that the tip of the valve needle 24 penetrates into the bore 34 in the seat 32 at one end of its stroke and closes it. This position is indicated in Figure 1.

Am anderen Ende ihres Hubes gibt die Ventilnadel 24 die Bohrung 34 in dem Sitz 32 frei, so daß der flüssige, hochpolymere thermoplastische Werkstoff aus der Querbohrung 18 über das Loch 19 in die Bohrung 34 des Sitzes 32 fließen kann.At the other end of its stroke, the valve needle 24 clears the bore 34 in the seat 32 so that the liquid, highly polymeric thermoplastic material can flow from the transverse bore 18 through the hole 19 into the bore 34 of the seat 32.

In Bewegungsrichtung der Ventilnadel 24, also mit der Bohrung in dem Ventilkörper 22 und der Bohrung 34 in dem Sitz 32 fluchtend, schließt sich ein kurzer Kanal 36 im Teil 12 an, der in der dem Teil 14 zuge­wandten Stirnfläche des Teils 12 endet.In the direction of movement of the valve needle 24, ie in alignment with the bore in the valve body 22 and the bore 34 in the seat 32, there is a short channel 36 in the part 12, which ends in the end face of the part 12 facing the part 14.

In der den Bohrungen 36 des Teils 12 gegenüberliegenden Stirnfläche des Teils 14 befindet sich eine langgestreckte Ausbreitkammer 37, die sich nahezu über die gesamte Länge des Düsenkörpers aus den beiden Teilen 12, 14 erstreckt und ebenfalls mit den Bohrungen 36 fluchtet, so daß der flüssige, hochpolymere thermoplastische Werkstoff auf einer geraden Linie von dem Loch 19 über die Bohrung 34 im Sitz 32 und die Bohrung 36 in dem Teil 12 in die Ausbreitkammer 37 fließen kann und dadurch gleichmäßig über nahezu die gesamte Länge des Düsenkörpers 12, 14 ver­teilt wird.In the end face of the holes 36 of the part 12 of the Part 14 is an elongated spreading chamber 37 which extends almost over the entire length of the nozzle body from the two parts 12, 14 and is also aligned with the bores 36, so that the liquid, highly polymeric thermoplastic material is in a straight line from the hole 19th can flow into the spreading chamber 37 via the bore 34 in the seat 32 and the bore 36 in the part 12 and is thereby distributed uniformly over almost the entire length of the nozzle body 12, 14.

Zwischen den beiden aneinanderliegenden Stirnflächen der beiden Teile 12, 14 ist der eigentliche Austrittsschlitz 38 angeordnet, der bei der dargestellten Ausführungsform durch eine Ausfräsung in der Stirnfläche des Teils 14 gebildet wird.The actual outlet slot 38 is arranged between the two adjacent end faces of the two parts 12, 14, which in the embodiment shown is formed by milling in the end face of the part 14.

Als Alternative hierzu ist es auch möglich, diese Ausfräsung in der Stirnfläche des Teils 12 vorzusehen. Schließlich kann der Schlitz noch durch ein sogenanntes "Maskenblech" gebildet werden, also ein zwischen die beiden Teile 12, 14 eingespanntes Blechstück mit einer den Schlitz bildenden Aussparung.As an alternative to this, it is also possible to provide this cutout in the end face of part 12. Finally, the slot can also be formed by a so-called “mask sheet”, that is to say a piece of sheet metal clamped between the two parts 12, 14 with a recess forming the slot.

Der Schlitz 38 erstreckt sich in jedem Fall von der Unterkante des Dü­senkörpers 12, 14 nach oben bis zur Ausbreitkammer 37.The slot 38 extends in any case from the lower edge of the nozzle body 12, 14 up to the expansion chamber 37.

Die unteren Flächen der beiden Teile 12, 14 sind in der üblichen Weise abgeschrägt; außerdem ist die dem Austrittsschlitz 38 zugewandte Unter­kante des linken Teils 12 etwas vorgezogen (bei 48), so daß eine Ab­rißkante entsteht.The lower surfaces of the two parts 12, 14 are chamfered in the usual way; in addition, the lower edge of the left part 12 facing the exit slot 38 is slightly advanced (at 48), so that a tear-off edge is formed.

Die Schlitzdüse 10 empfängt über die Querbohrung 18 den verflüssigten, hochpolymeren, thermoplastischen Werkstoff, insbesondere einen Schmelz­klebstoff auf der Basis von Polyurethan, unter Druck von einem Verflüs­sigungsgerät; aus der Querbohrung 18 gelangt der Werkstoff in die ver­schiedenen Löcher 19 und steht dort unter Druck an, da sich bei der aus Figur 1 ersichtlichen Lage die Spitze der Ventilnadel 24 in der Aus­trittsbohrung 34 des Sitzes 32 befindet und damit die Bohrung 36 ver­sperrt ist.The slot nozzle 10 receives the liquefied, high polymer, thermoplastic material, in particular a hot melt adhesive based on polyurethane, under pressure from a liquefaction device via the transverse bore 18; from the transverse bore 18 the material reaches the various holes 19 and is under pressure there, since in the position shown in FIG. 1 the tip of the valve needle 24 is in the outlet bore 34 of the seat 32 and the bore 36 is thus blocked.

Durch Beaufschlagung der dem Ventilkörper 22 zugewandten Fläche des Kolben 26 wird der Kolben 26 pneumatisch nach oben verschoben, so daß sich die Ventilnadel 24 nach oben bewegt und damit die Bohrung 34 freigibt, so daß nun der flüssige, hochpolymere thermoplastische Werk­stoff durch die Bohrung 34 in dem Sitz 32, die Bohrung 36 und die Aus­breitkammer 37 über die gesamte Länge in den Austrittsschlitz 38 ge­langen kann.By acting on the surface of the piston 26 facing the valve body 22, the piston 26 is pneumatically displaced upward, so that the valve needle 24 moves upward and thus clears the bore 34, so that the liquid, highly polymeric thermoplastic material through the bore 34 in the seat 32, the bore 36 and the expansion chamber 37 can reach the outlet slot 38 over the entire length.

Durch Beaufschlagung der von dem Ventilkörper 22 abgewandten Fläche des Kolbens 26 mit Druckluft wird die Ventilnadel 24 wieder nach unten ver­schoben und dadurch die Bohrung 34 versperrt, so daß der Auftrag des hochpolymeren Werkstoffes unterbrochen wird.By acting on the surface of the piston 26 facing away from the valve body 22 with compressed air, the valve needle 24 is moved downward again, thereby blocking the bore 34, so that the application of the high-polymer material is interrupted.

Gemäß der Darstellung in Figur 2 können mehrere, bei der dargestellten Ausführungsform insgesamt vier Ventile vorgesehen werden, die jeweils Teile der Ausbreitkammer 37 mit dem flüssigen, hochpolymeren Werkstoff versorgen.According to the illustration in FIG. 2, a plurality of valves, four in the embodiment shown, can be provided, each of which supplies parts of the spreading chamber 37 with the liquid, high-polymer material.

Als Alternative zu der dargestellten Ausführungsform kann sich die Aus­breitkammer 37 auch in der Stirnfläche des Teils 12 befinden; wesent­lich ist nur, daß der aus den einzelnen Bohrungen 36 kommende, flüssi­ge hochpolymere Werkstoff gleichmäßig über die gesamte Länge der Aus­breitkammer 37 und damit des Austrittschlitzes 38 verteilt wird.As an alternative to the illustrated embodiment, the spreading chamber 37 can also be located in the end face of the part 12; it is only essential that the liquid, highly polymeric material coming from the individual bores 36 is distributed uniformly over the entire length of the spreading chamber 37 and thus of the outlet slot 38.

Der Werkstoff fließt nach dem Verlassen der Querbohrung 18 geradlinig auf einer kurzen Strecke von dem Loch 19 durch die Bohrungen 34, 36 in die Ausbreitkammer 37; auch die Umbiegung beim Übergang von der Aus­breitkammer 37 in den Schlitz 38 ist nur gering, da Bohrung 36 und Schlitz 38 in einem Winkel von 120° zueinander verlaufen.After leaving the transverse bore 18, the material flows in a straight line over a short distance from the hole 19 through the bores 34, 36 into the spreading chamber 37; the bending at the transition from the expansion chamber 37 into the slot 38 is only slight, since the bore 36 and slot 38 run at an angle of 120 ° to one another.

In Figur 3 ist der Teil 14 mit der Ausbreitkammer 37 und der dem Aus­trittsschlitz 38 bildenden Ausfräsung in der Stirnfläche des Teils 14 dargestellt.FIG. 3 shows part 14 with the spreading chamber 37 and the cutout forming the outlet slot 38 in the end face of part 14.

Figur 2 zeigt eine perspektivische Seitenansicht des Düsenkörpers mit den beiden Teilen 12, 14, vier schematisch angedeuteten Absperrventilen 20, der Ausbreitkammer 37 und dem Austrittsschlitz 38.FIG. 2 shows a perspective side view of the nozzle body with the two parts 12, 14, four schematically indicated shut-off valves 20, the spreading chamber 37 and the outlet slot 38.

Claims (12)

1. Schlitzdüse zum Auftragen eines flüssigen, hochpolymeren Werkstof­fes, insbesondere eines Schmelzklebstoffes auf der Basis von Poly­urethan,
a) mit einem Düsenkörper,
b)mit einem Zuführkanal für den flüssigen Werkstoff in dem Düsen­körper,
c) mit einem steuerbaren Absperrventil,
d) mit einer sich an den Zuführkanal anschließenden Ausbreitkammer, und
e) mit einem mit der Ausbreitkammer verbundenen Austrittsschlitz,
gekennzeichnet durch die folgenden Merkmale:
f) das Absperrventil (20) ist in den Düsenkörper (12, 14) integriert; und
g) der flüssige, hochpolymere Werkstoff strömt auf einer im wesent­ lichen geraden Strecke von dem Absperrventil (20) durch einen kurzen Zuführkanal (32, 34) in die Ausbreitkammer (37).1. slot nozzle for applying a liquid, high polymer material, in particular a hot melt adhesive based on polyurethane,
a) with a nozzle body,
b) with a feed channel for the liquid material in the nozzle body,
c) with a controllable shut-off valve,
d) with a spreading chamber adjoining the feed channel, and
e) with an outlet slot connected to the spreading chamber,
characterized by the following features:
f) the shut-off valve (20) is integrated in the nozzle body (12, 14); and
g) the liquid, highly polymeric material flows essentially on one Lichen straight line from the shut-off valve (20) through a short feed channel (32, 34) into the spreading chamber (37). 2. Schlitzdüse nach Anspruch 1, dadurch gekennzeichnet, daß das Ab­sperrventil (20) einen in den Düsenkörper (12, 14) integrierten Ven­tilkörper (22) mit einer pneumatisch hin- und herbewegbaren Ventilna­del (24) aufweist.2. slot nozzle according to claim 1, characterized in that the shut-off valve (20) in the nozzle body (12, 14) integrated valve body (22) with a pneumatically reciprocating valve needle (24). 3. Schlitzdüse nach einem der Ansprüche 1 oder 2, dadurch gekennzeich­net, daß der Düsenkörper (12, 14) einen Querkanal (18) für den flüssi­gen, hochpolymeren Werkstoff aufweist, und daß der Querkanal (18) im rechten Winkel zu dem Zuführkanal (34, 36) verläuft.3. slot nozzle according to one of claims 1 or 2, characterized in that the nozzle body (12, 14) has a transverse channel (18) for the liquid, high polymer material, and that the transverse channel (18) at right angles to the supply channel (34 , 36) runs. 4. Schlitzdüse nach einem der Ansprüche 1 bis 3, dadurch gekennzeich­net, daß der Abstand zwischen dem Absperrventil (20) und dem Eintritt in die Ausbreitkammer (37) maximal 50 mm, insbesondere maximal 25 mm beträgt.4. slot nozzle according to one of claims 1 to 3, characterized in that the distance between the shut-off valve (20) and the entry into the spreading chamber (37) is a maximum of 50 mm, in particular a maximum of 25 mm. 5. Schlitzdüse nach einem der Ansprüche 1 bis 4, dadurch gekennzeich­net, daß der Düsenkörper (12, 14) mehrere Zuführkanäle (34, 36) ent­hält, die jeweils in die Ausbreitkammer (27) münden.5. slot nozzle according to one of claims 1 to 4, characterized in that the nozzle body (12, 14) contains a plurality of feed channels (34, 36), each opening into the spreading chamber (27). 6. Schlitzdüse nach einem der Ansprüche 1 bis 5, dadurch gekennzeich­net, daß der Austrittsschlitz (38) einen Winkel von mehr als 90°, insbesondere im Bereich von 110 bis 150°, mit dem Zuführkanal (34, 36) bildet.6. slot nozzle according to one of claims 1 to 5, characterized in that the outlet slot (38) forms an angle of more than 90 °, in particular in the range of 110 to 150 °, with the feed channel (34, 36). 7. Schlitzdüse nach einem der Ansprüche 2 bis 6, dadurch gekennzeich­net, daß der Ventilkörper (20) in einen Durchlaß des Düsenkörpers (12, 14) eingesetzt ist, der mit dem Querkanal (18) verbunden ist.7. slot nozzle according to one of claims 2 to 6, characterized in that the valve body (20) is inserted into a passage of the nozzle body (12, 14) which is connected to the transverse channel (18). 8. Schlitzdüse nach Anspruch 7, dadurch gekennzeichnet, daß sich in dem Durchlaß des Düsenkörpers(12, 14) ein austauschbarer Sitz (32) für die Ventilnadel (24) befindet.8. slot nozzle according to claim 7, characterized in that in the passage of the nozzle body (12, 14) there is an exchangeable seat (32) for the valve needle (24). 9. Schlitzdüse nach einem der Ansprüche 1 bis 8, dadurch gekennzeich­ net, daß der Düsenkörper aus zwei miteinander verbundenen Teilen (12, 14) besteht, zwischen deren Anlageflächen der Austrittsschlitz (38) ausgebildet ist.9. slot nozzle according to one of claims 1 to 8, characterized in net that the nozzle body consists of two interconnected parts (12, 14), between the contact surfaces of the outlet slot (38) is formed. 10. Schlitzdüse nach Anspruch 9, dadurch gekennzeichnet, daß der Aus­trittsschlitz (38) durch eine Ausfräsung in einer der beiden Stirn­flächen der beiden Teile (12, 14) oder durch ein Maskenblech gebildet wird.10. slot nozzle according to claim 9, characterized in that the outlet slot (38) is formed by milling in one of the two end faces of the two parts (12, 14) or by a mask plate. 11. Schlitzdüse nach einem der Ansprüche 9 oder 10, dadurch gekenn­zeichnet, daß sich die Ausbreitkammer (37) in einer Stirnfläche der beiden Teile (12, 14) befindet.11. Slot nozzle according to one of claims 9 or 10, characterized in that the spreading chamber (37) is in an end face of the two parts (12, 14). 12. Schlitzdüse nach einem der Ansprüche 9 bis 11, dadurch gekennzeich­net, daß sich der Durchlaß für das Absperrventil (20) und der anschlie­ßende Zuführkanal (36) in einem der beiden Teile (12, 14) des Düsen­körper befinden.12. slot nozzle according to one of claims 9 to 11, characterized in that the passage for the shut-off valve (20) and the subsequent feed channel (36) are in one of the two parts (12, 14) of the nozzle body.
EP89118397A 1988-10-04 1989-10-04 Slot nozzle Expired - Lifetime EP0366962B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8812493U 1988-10-04
DE8812493U DE8812493U1 (en) 1988-10-04 1988-10-04 Slot nozzle

Publications (3)

Publication Number Publication Date
EP0366962A2 true EP0366962A2 (en) 1990-05-09
EP0366962A3 EP0366962A3 (en) 1990-11-14
EP0366962B1 EP0366962B1 (en) 1995-03-01

Family

ID=6828548

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Application Number Title Priority Date Filing Date
EP89118397A Expired - Lifetime EP0366962B1 (en) 1988-10-04 1989-10-04 Slot nozzle

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US (1) US5056687A (en)
EP (1) EP0366962B1 (en)
JP (1) JP2752728B2 (en)
AT (1) ATE119080T1 (en)
DE (2) DE8812493U1 (en)
ES (1) ES2070875T3 (en)

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DE19755625A1 (en) * 1997-12-15 1999-07-01 Jagenberg Papiertech Gmbh Slot nozzle for coating material webs, in particular paper or cardboard webs with pigment coating ink
DE10232984A1 (en) * 2002-07-19 2004-02-05 Steag Hamatech Ag Nozzle arrangement for applying a liquid to a substrate

Families Citing this family (8)

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Publication number Priority date Publication date Assignee Title
DE9108543U1 (en) * 1991-07-11 1991-11-14 Nordson Corp., Westlake, Ohio Wide slot nozzle for applying fluids, especially hot melt adhesives
US5376414A (en) * 1993-06-01 1994-12-27 Sophia Systems Co., Ltd. Expansion compensated precision extrusion method
US5622315A (en) * 1995-03-14 1997-04-22 Nordson Corporation Adjustable slot goating die
JP2917127B2 (en) * 1996-07-12 1999-07-12 井上金属工業株式会社 Coating device
DE29622341U1 (en) * 1996-12-23 1997-04-03 Nordson Corp., Westlake, Ohio Device for applying flowable material to a substrate, in particular for the intermittent application of liquid adhesive
DE19714029C2 (en) * 1997-04-04 1999-06-10 Bargen Rudolf Von Application head
DE19934641C1 (en) * 1999-07-23 2000-10-12 Itw Ind Gmbh Dosed delivery device for flow medium e.g adhesive, lubricant or paint, has application head fitted with replacable application module via fixing bolts and cooperating clamp strap
US20090000758A1 (en) 2007-04-06 2009-01-01 Ashley Stone Device for Casting

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DE3223999A1 (en) * 1981-07-02 1983-02-10 Dynamelt (1981) Ltd., Daventry APPLICATION HEAD FOR APPLYING A COATING TO A PASSING TAPE
DE3635481C1 (en) * 1986-10-18 1988-02-11 Dittberner Gmbh Nozzle head for the machine application of glue with a detachably fastened nozzle plate
WO1988001542A1 (en) * 1986-09-03 1988-03-10 Nordson Corporation Adhesive applicator assembly
US4774109A (en) * 1987-07-21 1988-09-27 Nordson Corporation Method and apparatus for applying narrow, closely spaced beads of viscous liquid to a substrate

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US3348520A (en) * 1965-09-16 1967-10-24 Lockwood Tech Applicator system for hot melt adhesive and the like
GB1497661A (en) * 1974-11-02 1978-01-12 Molins Ltd Devices for applying adhesives to a moving web
US4613078A (en) * 1984-04-09 1986-09-23 Nordson Corporation Quick replaceable nozzle assembly
US4667879A (en) * 1985-08-21 1987-05-26 Nordson Corporation Thermoplastic material applicator having an adjustable slot nozzle
DE3541784C1 (en) * 1985-11-26 1987-05-21 Meltex Verbindungstechnik Gmbh Device for applying liquid adhesive, in particular hot melt

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DE3223999A1 (en) * 1981-07-02 1983-02-10 Dynamelt (1981) Ltd., Daventry APPLICATION HEAD FOR APPLYING A COATING TO A PASSING TAPE
WO1988001542A1 (en) * 1986-09-03 1988-03-10 Nordson Corporation Adhesive applicator assembly
DE3635481C1 (en) * 1986-10-18 1988-02-11 Dittberner Gmbh Nozzle head for the machine application of glue with a detachably fastened nozzle plate
US4774109A (en) * 1987-07-21 1988-09-27 Nordson Corporation Method and apparatus for applying narrow, closely spaced beads of viscous liquid to a substrate

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19755625A1 (en) * 1997-12-15 1999-07-01 Jagenberg Papiertech Gmbh Slot nozzle for coating material webs, in particular paper or cardboard webs with pigment coating ink
DE10232984A1 (en) * 2002-07-19 2004-02-05 Steag Hamatech Ag Nozzle arrangement for applying a liquid to a substrate
US7419549B2 (en) 2002-07-19 2008-09-02 Steag Hamatech Ape Gmbh & Co. Kg Nozzle assembly for applying a liquid to a substrate

Also Published As

Publication number Publication date
US5056687A (en) 1991-10-15
JP2752728B2 (en) 1998-05-18
DE58909056D1 (en) 1995-04-06
ATE119080T1 (en) 1995-03-15
EP0366962B1 (en) 1995-03-01
ES2070875T3 (en) 1995-06-16
DE8812493U1 (en) 1990-02-01
JPH02169065A (en) 1990-06-29
EP0366962A3 (en) 1990-11-14

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