EP0006273A1 - Apparatus for continuously applying a polymer coating to the external surface of thin-walled endless profiles - Google Patents

Apparatus for continuously applying a polymer coating to the external surface of thin-walled endless profiles Download PDF

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Publication number
EP0006273A1
EP0006273A1 EP79200306A EP79200306A EP0006273A1 EP 0006273 A1 EP0006273 A1 EP 0006273A1 EP 79200306 A EP79200306 A EP 79200306A EP 79200306 A EP79200306 A EP 79200306A EP 0006273 A1 EP0006273 A1 EP 0006273A1
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EP
European Patent Office
Prior art keywords
plastic
profiles
coating
powder
thin
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.)
Ceased
Application number
EP79200306A
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German (de)
French (fr)
Inventor
Werner Dr. Dipl.-Chem. Scheiber
Per Otto Dipl.-Chem. Aalrust
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GEA Group AG
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Metallgesellschaft AG
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Publication date
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Publication of EP0006273A1 publication Critical patent/EP0006273A1/en
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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
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/20—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to wires
    • 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
    • B05C19/00—Apparatus specially adapted for applying particulate materials to surfaces
    • B05C19/008—Accessories or implements for use in connection with applying particulate materials to surfaces; not provided elsewhere in B05C19/00
    • 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
    • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
    • B05C9/08—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation
    • B05C9/10—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation the auxiliary operation being performed before the application
    • 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
    • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
    • B05C9/08—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation
    • B05C9/14—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation the auxiliary operation involving heating or cooling
    • 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
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
    • B05D7/146—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies to metallic pipes or tubes
    • 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
    • B05D2401/00—Form of the coating product, e.g. solution, water dispersion, powders or the like
    • B05D2401/30—Form of the coating product, e.g. solution, water dispersion, powders or the like the coating being applied in other forms than involving eliminable solvent, diluent or dispersant
    • B05D2401/32—Form of the coating product, e.g. solution, water dispersion, powders or the like the coating being applied in other forms than involving eliminable solvent, diluent or dispersant applied as powders
    • 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
    • B05D3/02—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 baking
    • B05D3/0218—Pretreatment, e.g. heating the substrate
    • B05D3/0245—Pretreatment, e.g. heating the substrate with induction heating
    • 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
    • B05D3/02—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 baking
    • B05D3/0254—After-treatment
    • B05D3/0281—After-treatment with induction heating

Definitions

  • the invention relates to a device for the continuous production of plastic coatings on the outside of thin-walled endless hollow profiles, in particular continuous tubes, consisting of a heating device with which the hollow profiles can be heated in a defined manner, a coating device in which the plastic powder can be applied to the heated surface of the hollow profiles, if appropriate a further heating device in which the powder applied can be melted through to a smooth plastic coating and a cooling device in which the coated profiles can be cooled.
  • the coating of hollow profiles, especially pipes, with plastics has been widely used in recent years.
  • a two-stage powder melting process is used in particular, in which a certain amount of plastic is fritted onto the defined, preheated metal surface of the tube, which is heated again in a further operation and the melted powder is melted into a smooth plastic coating.
  • the device for carrying out this method as described in OE-PS 342 738, consists of an induction coil in which the endless tube to be coated is heated to the surface temperature required for fritting the plastic. The heated pipe moves further into a coating head, where it is surrounded by a turbulent plastic powder / air mixture.
  • the endless tube which is fritted with plastic, now runs through a second induction coil, in which it is heated to such an extent that the plastic cover which has been fritted melts through evenly.
  • the coated tube is cooled and leaves the system by means of a suitable cutting or reeling device. After flowing through the coating head, the residual plastic powder is separated from the air flow in a cyclone.
  • the disadvantage of this device is a comparatively moderate coating speed. It is therefore provided in DE-OS 26 16 292 arranged behind the cooling device pulling device, which consists of two circumferential belts, of which the tube is gripped on the bottom and top and under the action of traction over a limited distance with continuous Speed is transported without damaging the plastic coating.
  • Another disadvantage is that, with such a pulling device, only tubes with a circular cross section can be transported in accordance with the proposed method of operation.
  • the solution to this problem consists in the use of a known, for the reducing deformation of continuous profiles, such as wires and pipes, used drawing system, which consists of two drawing carriages equipped with drawing jaws driven by a shaft provided with two cam drums, the control system being designed so that during the transfer of the hollow profile from one drawing carriage to the other, both initially a short one Track are engaged together before the detaching pulling slide releases the hollow profile in the beginning return.
  • used drawing system which consists of two drawing carriages equipped with drawing jaws driven by a shaft provided with two cam drums, the control system being designed so that during the transfer of the hollow profile from one drawing carriage to the other, both initially a short one Track are engaged together before the detaching pulling slide releases the hollow profile in the beginning return.
  • the hollow profile is pulled off continuously, practically endless, "hand over hand”. This also ensures that the change between the slide takes place on the fly and that no shocks or impacts affect the coating process.
  • hollow profiles of different cross-sections can be transported.
  • hollow sections with a rectangular cross-section they can be transported lying with one edge downward, so that attached water drops can flow away from the cooling device, which would otherwise lead to streaking in the plastic coating.
  • the hollow profiles to be coated can be freely guided over comparatively long distances, which is particularly important for powder melting processes because of the required cooling time of the profiles if driving at very high speeds is particularly important.
  • the use of the drawing system enables the already coated hollow profiles to be deformed, for example their cross-section reduction, since a drawing ring can be arranged upstream of the drawing slide.
  • the plastic powder air flow in the coating head of the system is generated by in a fluidized bed 15
  • Plastic powder is kept in suspension by the inflowing air and is pressed into the coating head by ring nozzles.
  • the plastic powder pressed into the coating head is accelerated and evenly distributed by the external air sucked in from the outlet opening 6.
  • the plastic powder in the cyclone 9 is separated from the air stream, which is sucked off by the fan 11 via the filter 10.
  • the plastic powder deposited in the cyclone 9 is returned to the fluidized bed 15 via the continuous lock device 12.
  • An amount equivalent to the plastic powder used is fed in batches from the powder silo 13 via the lock 14 to the fluidized bed 15.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Coating Apparatus (AREA)

Abstract

In the apparatus, a coating device (5), if need be a further heating device (7), and a cooling device (8) are arranged downstream of a heating device (4). So that the endless profiles can be transported through the apparatus at high speed, a drawing unit (16) is added which consists of two drawing slides which are driven by a shaft provided with two barrel cams and whose drawing jaws can be controlled in such a way that the endless profile can be drawn off fully continuously "hand over hand". <IMAGE>

Description

Die Erfindung betrifft eine Vorrichtung zur kontinuierlichen Herstellung von Kunststoffüberzügen auf der Außenseite von dünnwandigen Endloshohlprofilen, insbesondere Endlosrohren, bestehend aus einer Erwärmungseinrichtung, mit der die Hohlprofile definiert erwärmbar sind, einer Beschichtungseinrichtung, in der das Kunststoffpulver auf die erwärmte Oberfläche der Hohlprofile aufbringbar ist, gegebenenfalls einer weiteren Erwärmungseinrichtung, in der das aufgebrachte Pulver zu einem glatten Kunststoffüberzug durchschmelzbar ist und einer Kühleinrichtung, in der die beschichteten Profile abkühlbar sind.The invention relates to a device for the continuous production of plastic coatings on the outside of thin-walled endless hollow profiles, in particular continuous tubes, consisting of a heating device with which the hollow profiles can be heated in a defined manner, a coating device in which the plastic powder can be applied to the heated surface of the hollow profiles, if appropriate a further heating device in which the powder applied can be melted through to a smooth plastic coating and a cooling device in which the coated profiles can be cooled.

Die Beschichtung von Hohlprofilen, insbesondere Rohren, mit Kunststoffen hat in den letzten Jahren eine breite Anwendung gefunden. Zu diesem Zweck wird insbesondere ein zweistufiges Pulverschmelzverfahren benutzt, bei dem auf die definiert vorerhitzte Metalloberfläche des Rohres eine bestimmte Kunststoffmenge aufgefrittet, das in einem weiteren Arbeitsgang nochmals erwärmt und dabei das gefrittete Pulver zu einem glatten Kunststoffüberzug durchgeschmolzen wird. Die Vorrichtung zur Durchführung dieses Verfahrens besteht, wie in der OE-PS 342 738 beschrieben, aus einer Induktionsspule, in der das zu beschichtende Endlosrohr auf die für das Fritten des Kunststoffs erforderliche Oberflächentemperatur erwärmt wird. Das erwärmte Rohr wandert weiter in einen Beschichtungskopf und wird dort von einem turbulent strömenden Kunststoffpulver/Luft-Gemisch umspült. Das mit Kunststoff befrittete Endlosrohr läuft nun durch eine zweite Induktionsspule, in der es so hoch erwärmt wird, daß der angefrittete Kunststoffüberzug gleichmäßig durchschmilzt. Im darauffolgenden Wasserbad wird das beschichtete Rohr abgekühlt und verläßt die Anlage durch eine geeignete Abläng- oder Haspelvorrichtung. Nach Durchströmen des Beschichtungskopfes wird das Restkunststoffpulver in einem Zyklon vom Luftstrom getrennt.The coating of hollow profiles, especially pipes, with plastics has been widely used in recent years. For this purpose, a two-stage powder melting process is used in particular, in which a certain amount of plastic is fritted onto the defined, preheated metal surface of the tube, which is heated again in a further operation and the melted powder is melted into a smooth plastic coating. The device for carrying out this method, as described in OE-PS 342 738, consists of an induction coil in which the endless tube to be coated is heated to the surface temperature required for fritting the plastic. The heated pipe moves further into a coating head, where it is surrounded by a turbulent plastic powder / air mixture. The endless tube, which is fritted with plastic, now runs through a second induction coil, in which it is heated to such an extent that the plastic cover which has been fritted melts through evenly. In the subsequent water bath, the coated tube is cooled and leaves the system by means of a suitable cutting or reeling device. After flowing through the coating head, the residual plastic powder is separated from the air flow in a cyclone.

Es besteht aber auch die Möglichkeit, dickwandige Rohre bereits beim Durchlauf durch die erste Induktionsspule so hoch zu erwärmen, daß nach dem Verlassen des Beschichtungskopfes der aufgefrittete Kunststoffüberzug ohne eine zusätzliche Erwärmung durchschmilzt.However, there is also the possibility of heating thick-walled tubes so high as they pass through the first induction coil that after the coating head has left the coated plastic coating melts without additional heating.

Es ist selbstverständlich auch möglich, das Kunststoffpulver durch Versprühen im elektrostatischen Feld auf die erwärmten Hohlprofile aufzubringen.It is of course also possible to apply the plastic powder to the heated hollow profiles by spraying in an electrostatic field.

Der Nachteil dieser Vorrichtung besteht in einer vergleichsweise mäßigen Beschichtungsgeschwindigkeit. Es ist deshalb in der DE-OS 26 16 292 eine hinter der Kühleinrichtung angeordnete Zieheinrichtung vorgesehen, die aus zwei umlaufenden Bändern besteht, von denen das Rohr an der Unter- und Oberseite erfaßt und unter der Einwirkung der Zugkraft über eine begrenzte Strecke hinweg mit kontinuierlicher Geschwindigkeit transportiert wird, ohne daß dabei der Kunststoffüberzug beschädigt wird.The disadvantage of this device is a comparatively moderate coating speed. It is therefore provided in DE-OS 26 16 292 arranged behind the cooling device pulling device, which consists of two circumferential belts, of which the tube is gripped on the bottom and top and under the action of traction over a limited distance with continuous Speed is transported without damaging the plastic coating.

Als nachteilig hat sich jedoch erwiesen, daß die Ziehgeschwindigkeit dieser Ziehvorrichtung begrenzt ist, da die Transportbänder von einer bestimmten Zugkraft an auf den zu transportierenden Rohren zu rutschen beginnen.It has proven to be disadvantageous, however, that the drawing speed of this drawing device is limited, since the conveyor belts begin to slide on the pipes to be transported from a certain tensile force.

Ein weiterer Nachteil besteht darin, daß sich mit einer solchen Ziehvorrichtung gemäß der vorgeschlagenen Arbeitsweise nur Rohre mit kreisförmigem Querschnitt transportieren lassen.Another disadvantage is that, with such a pulling device, only tubes with a circular cross section can be transported in accordance with the proposed method of operation.

Es ist die Aufgabe der vorliegenden Erfindung, Hohlprofile unterschiedlichen Querschnitts mit hoher Geschwindigkeit durch die Beschichtungsvorrichtung der eingangs beschriebenen Bauart zu transportieren, ohne daß der homogene Kunststoffüberzug in seiner Dicke, Gleichmäßigkeit und festen Haftung auf dem Hohlprofil beeinträchtigt werden. Ferner soll es möglich sein, die beschichteten Hohlprofile, falls erforderlich, abschließend zu verformen.It is the object of the present invention to transport hollow profiles of different cross-sections at high speed through the coating device of the type described at the outset, without the thickness, uniformity and firm adhesion of the homogeneous plastic coating being impaired on the hollow profile. Furthermore, it should be possible to finally deform the coated hollow profiles, if necessary.

Die Lösung dieser Aufgabe besteht in der Anwendung einer an sich bekannten, für das reduzierende Verformen von Endlosprofilen, wie Drähten und Rohren, verwendeten Ziehanlage, die aus zwei von einer mit zwei Kurventrommeln versehenen Welle angetriebenen mit Ziehbacken ausgerüsteten Ziehschlitten besteht, wobei die Steuerung so ausgelegt ist, daß während der Übergabe des Hohlprofils von einem Ziehschlitten zum anderen beide zunächst eine kurze Strecke gemeinsam im Eingriff sind, bevor der ablösende Ziehschlitten im beginnenden Rücklauf das Hohlprofil freigibt.The solution to this problem consists in the use of a known, for the reducing deformation of continuous profiles, such as wires and pipes, used drawing system, which consists of two drawing carriages equipped with drawing jaws driven by a shaft provided with two cam drums, the control system being designed so that during the transfer of the hollow profile from one drawing carriage to the other, both initially a short one Track are engaged together before the detaching pulling slide releases the hollow profile in the beginning return.

Das Hohlprofil wird praktisch endlos "Hand über Hand" voll kontinuierlich abgezogen. Damit ist auch sichergestellt, daß der Wechsel zwischen den Ziehschlitten fliegend erfolgt und keine Erschütterung oder Stöße den Beschichtungsvorgang beeinträchtigen.The hollow profile is pulled off continuously, practically endless, "hand over hand". This also ensures that the change between the slide takes place on the fly and that no shocks or impacts affect the coating process.

Da die Ziehbacken in vorteilhafter Weise auswechselbar sind, können Hohlprofile unterschiedlichen Querschnitts transportiert werden. Bei im Querschnitt rechteckigen Hohlprofilen können diese mit einer Kante nach unten liegend transportiert werden, so daß anhängende Wassertropfen aus der Kühleinrichtung gut abfließen können, die sonst zur Schlierenbildung in dem Kunststoffüberzug führen.Since the drawing jaws can be exchanged in an advantageous manner, hollow profiles of different cross-sections can be transported. In the case of hollow sections with a rectangular cross-section, they can be transported lying with one edge downward, so that attached water drops can flow away from the cooling device, which would otherwise lead to streaking in the plastic coating.

Da mit der erfindungsgemäß eingesetzten Ziehanlage zehnmal so große Ziehkräfte wie mit der Ziehvorrichtung nach der DE-OS 26 16 292 übertragen werden können, können die zu beschichtenden Hohlprofile über vergleichsweise längere Strecken frei geführt werden, was für Pulverschmelzverfahren wegen der erforderlichen Abkühlzeit der Profile, insbesondere wenn mit sehr hohen Geschwindigkeiten gefahren werden soll, besonders wichtig-ist.Since with the drawing system used according to the invention ten times as large drawing forces can be transmitted as with the drawing device according to DE-OS 26 16 292, the hollow profiles to be coated can be freely guided over comparatively long distances, which is particularly important for powder melting processes because of the required cooling time of the profiles if driving at very high speeds is particularly important.

Der Einsatz der Ziehanlage ermöglicht die Verformung der bereits beschichteten Hohlprofile, beispielsweise deren Querschnittsreduzierung, da den Ziehschlitten ein Ziehring vorgeordnet sein kann.The use of the drawing system enables the already coated hollow profiles to be deformed, for example their cross-section reduction, since a drawing ring can be arranged upstream of the drawing slide.

Die Erfindung ist anhand eines Ausführungsbeispiels und der zugehörigen Zeichnung näher erläutert:

  • Ein aus Endlosband zum Rohr geformtes und geschweißtes Endlosrohr 1 von 12 mm Durchmesser und 1 mm Wanddicke wird nach einer chemischen oder mechanischen Vorbehandlung bei 2 mit einem Primer versehen, der anschließend in einer Trockenkammer 3 von Lösungsmitteln befreit wird. Dann wird das zu beschichtende Endlosrohr in der Induktionsspule 4 auf die erforderliche Auffrittungstemperatur von > 1860C des Kunststoffs vorerwärmt. Das erhitzte Rohr wandert weiter in den Beschichtungskopf 5 und wird dort von dem entgegen seiner Bewegung mit einer Geschwindigkeit von 45 m/s strömenden KunststoffpulverLuft-Gemisch mit 1,5 kg/m3 Polyamid 11-Pulver in der Körnung von 20 bis 80 pm umspült. Bei der Austrittsöffnung 6 verläßt das nun mit Kunststoffpulver mit einer Dicke von 140 µm befrittete Endlosrohr die Beschichtungsstrecke und wird in einer zweiten Induktionsspule 7 nochmals über den Schmelzpunkt des Polyamid-11 erwärmt, so daß der angefrittete Kunststoffüberzug gleichmäßig durchschmilzt. Im darauffolgenden Wasserbad 8 wird das beschichtete Endlosrohr abgekühlt und über die Ziehanlage 16 einer geeigneten Abläng- oder Haspelvorrichtung zugeführt. Das Endlosrohr wandert mit einer Geschwindigkeit von ca. 110 m/min durch die Anlage.
The invention is explained in more detail using an exemplary embodiment and the associated drawing:
  • After a chemical or mechanical pretreatment at 2, a continuous tube 1, 12 mm in diameter and 1 mm in wall, which is formed and welded from an endless strip into a tube, is provided with a primer, which is then freed of solvents in a drying chamber 3. Then is preheated to be coated endless pipe in the induction coil 4 to the required Auffrittungstemperatur of> 186 0 C of the plastic. The heated tube moves further into the coating head 5 and is washed there by the plastic powder-air mixture flowing against its movement at a speed of 45 m / s with 1.5 kg / m 3 polyamide 11 powder with a grain size of 20 to 80 pm . At the outlet opening 6, the endless tube, which is now fried with plastic powder with a thickness of 140 μm, leaves the coating section and is heated again in a second induction coil 7 above the melting point of the polyamide 11, so that the plastic coating which has been fritted melts evenly. In the subsequent water bath 8, the coated endless tube is cooled and fed to a suitable cutting or coiling device via the drawing system 16. The endless tube travels through the system at a speed of approx. 110 m / min.

Der Kunststoffpulver-Luftstrom im Beschichtungskopf der Anlage wird erzeugt, indem in einem Wirbelbett 15 Kunststoffpulver durch aufströmende Luft in Schwebe gehalten und durch Ringdüsen in den Beschichtungskopf eingepreßt wird. Durch die von der Austrittsöffnung 6 angesaugte Fremdluft wird das in den Beschichtungskopf eingepreßte Kunststoffpulver beschleunigt und gleichmäßig verteilt. Nach Durchströmen des Beschichtungskopfes 5 wird das Kunststoffpulver im Zyklon 9 vom Luftstrom getrennt, der über das Filter 10 vom Gebläse 11 abgesaugt wird. Das im Zyklon 9 abgeschiedene Kunststoffpulver wird über die kontinuierliche Schleusenvorrichtung 12 in das Wirbelbett 15 zurückgeführt. Eine dem verbrauchten Kunststoffpulver äquivalente Menge wird aus dem Pulversilo 13 über die Schleuse 14 dem Wirbelbett 15 chargenweise zugeführt.The plastic powder air flow in the coating head of the system is generated by in a fluidized bed 15 Plastic powder is kept in suspension by the inflowing air and is pressed into the coating head by ring nozzles. The plastic powder pressed into the coating head is accelerated and evenly distributed by the external air sucked in from the outlet opening 6. After flowing through the coating head 5, the plastic powder in the cyclone 9 is separated from the air stream, which is sucked off by the fan 11 via the filter 10. The plastic powder deposited in the cyclone 9 is returned to the fluidized bed 15 via the continuous lock device 12. An amount equivalent to the plastic powder used is fed in batches from the powder silo 13 via the lock 14 to the fluidized bed 15.

Claims (2)

1. Vorrichtung zur kontinuierlichen Herstellung von Kunststoffüberzügen auf der Außenseite von dünnwandigen Endloshohlprofilen, insbesondere Endlosrohren, bestehend aus einer Erwärmungseinrichtung, mit der die Hohlprofile definiert erwärmbar sind, einer Beschichtungseinrichtung, in der das Kunststoffpulver auf die erwärmte Oberfläche der Hohlprofile aufbringbar ist, gegebenenfalls einer weiteren Erwärmungseinrichtung, in der das aufgebrachte Pulver zu einem glatten Kunststoffüberzug durchschmelzbar ist und einer Kühleinrichtung, in der die beschichteten Profile abkühlbar sind, gekennzeichnet durch eine anschließende Ziehanlage d6), bestehend aus zwei von einer mit zwei Kurventrommeln versehenen Welle angetriebenen Ziehschlitten, deren Ziehbacken so steuerbar sind, daß während der Übergabe des Hohlprofils (1) von einem Ziehschlitten zum anderen beide zunächst eine kurze Strecke im Eingriff sind, bevor der ablösende Ziehschlitten im beginnenden Rücklauf das Hohlprofil freigibt.1.Device for the continuous production of plastic coatings on the outside of thin-walled endless hollow profiles, in particular endless tubes, consisting of a heating device with which the hollow profiles can be heated in a defined manner, a coating device in which the plastic powder can be applied to the heated surface of the hollow profiles, optionally another Heating device in which the powder applied can be melted to a smooth plastic coating and a cooling device in which the coated profiles can be cooled, characterized by a subsequent drawing system d6), consisting of two drawing slides driven by a shaft provided with two cam drums, the drawing jaws of which can be controlled in this way are that during the transfer of the hollow profile (1) from one drawing slide to the other both are initially engaged for a short distance before the detaching drawing slide releases the hollow profile in the beginning return. 2. Vorrichtung nach Anspruch 1, gekennzeichnet durch auswechselbare Ziehbacken.2. Device according to claim 1, characterized by interchangeable drawing jaws.
EP79200306A 1978-06-20 1979-06-14 Apparatus for continuously applying a polymer coating to the external surface of thin-walled endless profiles Ceased EP0006273A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2826906 1978-06-20
DE2826906A DE2826906C2 (en) 1978-06-20 1978-06-20 Device for the continuous production of plastic coatings on endless hollow profiles

Publications (1)

Publication Number Publication Date
EP0006273A1 true EP0006273A1 (en) 1980-01-09

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EP79200306A Ceased EP0006273A1 (en) 1978-06-20 1979-06-14 Apparatus for continuously applying a polymer coating to the external surface of thin-walled endless profiles

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EP (1) EP0006273A1 (en)
JP (1) JPS608876B2 (en)
AU (1) AU525270B2 (en)
DE (1) DE2826906C2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1987006875A1 (en) * 1986-05-15 1987-11-19 Institut National De Recherche Chimique Appliquee Method for a continuous impregnation of organic, mineral or metal fibers with solid, pulverulent products suspended in a gas, and plant for implementing such method

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0058973B1 (en) * 1981-02-20 1988-10-12 Manfred Laudenklos Method and apparatus for coating endless objects
JPH0437104U (en) * 1990-07-25 1992-03-27

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3556888A (en) * 1967-06-23 1971-01-19 Glastrusions Pultrusion machine and method
US3965551A (en) * 1975-08-14 1976-06-29 Allied Tube & Conduit Corporation Production of polymer-coated steel tubing
FR2354181A1 (en) * 1976-06-10 1978-01-06 Ericson Sven PROCEDURE AND MECHANISM FOR DRIVING AND PLUGGING OF FELLOW TREE TRUNKS

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2414360C3 (en) * 1974-03-26 1980-09-04 Metallgesellschaft Ag, 6000 Frankfurt Device for producing thin plastic coatings on the outside of thin-walled metal pipes

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3556888A (en) * 1967-06-23 1971-01-19 Glastrusions Pultrusion machine and method
US3965551A (en) * 1975-08-14 1976-06-29 Allied Tube & Conduit Corporation Production of polymer-coated steel tubing
FR2354181A1 (en) * 1976-06-10 1978-01-06 Ericson Sven PROCEDURE AND MECHANISM FOR DRIVING AND PLUGGING OF FELLOW TREE TRUNKS

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1987006875A1 (en) * 1986-05-15 1987-11-19 Institut National De Recherche Chimique Appliquee Method for a continuous impregnation of organic, mineral or metal fibers with solid, pulverulent products suspended in a gas, and plant for implementing such method
EP0246167A1 (en) * 1986-05-15 1987-11-19 Institut National De Recherche Chimique Appliquee Method and installation for continuously impregnating fibres of an organic, mineral or metallic nature by pulverulent solid products suspended in a gas
FR2598649A1 (en) * 1986-05-15 1987-11-20 Inst Nat Rech Chimique PROCESS FOR THE CONTINUOUS IMPREGNATION OF ORGANIC, MINERAL OR METALLIC FIBERS BY PRODUCTS IN THE SOLID CONDITION, PULVERULENT, SUSPENSION IN A GAS AND INSTALLATION FOR ITS IMPLEMENTATION

Also Published As

Publication number Publication date
DE2826906A1 (en) 1980-01-03
JPS553898A (en) 1980-01-11
AU525270B2 (en) 1982-10-28
AU4818079A (en) 1980-01-03
DE2826906C2 (en) 1985-01-03
JPS608876B2 (en) 1985-03-06

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