DE2136656A1 - Inductive heating current - used to heat-seal two thermoplastic tubes together - Google Patents

Inductive heating current - used to heat-seal two thermoplastic tubes together

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Publication number
DE2136656A1
DE2136656A1 DE2136656A DE2136656A DE2136656A1 DE 2136656 A1 DE2136656 A1 DE 2136656A1 DE 2136656 A DE2136656 A DE 2136656A DE 2136656 A DE2136656 A DE 2136656A DE 2136656 A1 DE2136656 A1 DE 2136656A1
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Germany
Prior art keywords
conductors
plastic
welded
pipes
joint according
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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.)
Pending
Application number
DE2136656A
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German (de)
Inventor
Klaus Dipl Ing Blecken
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Individual
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Individual
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Priority to DE2136656A priority Critical patent/DE2136656A1/en
Publication of DE2136656A1 publication Critical patent/DE2136656A1/en
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/36—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
    • B29C65/3604—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint
    • B29C65/3608—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint comprising single particles, e.g. fillers or discontinuous fibre-reinforcements
    • B29C65/3612—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint comprising single particles, e.g. fillers or discontinuous fibre-reinforcements comprising fillers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/36—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
    • B29C65/3604—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint
    • B29C65/362—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint comprising at least a single wire, e.g. in the form of a winding
    • B29C65/3628—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint comprising at least a single wire, e.g. in the form of a winding said at least a single wire having a waveform, e.g. a sinusoidal form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/36—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
    • B29C65/3604—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint
    • B29C65/362—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint comprising at least a single wire, e.g. in the form of a winding
    • B29C65/3632—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint comprising at least a single wire, e.g. in the form of a winding comprising several wires, e.g. in the form of several independent windings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/116—Single bevelled joints, i.e. one of the parts to be joined being bevelled in the joint area
    • B29C66/1162—Single bevel to bevel joints, e.g. mitre joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/23—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being multiple and parallel or being in the form of tessellations
    • B29C66/232—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being multiple and parallel or being in the form of tessellations said joint lines being multiple and parallel, i.e. the joint being formed by several parallel joint lines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5221—Joining tubular articles for forming coaxial connections, i.e. the tubular articles to be joined forming a zero angle relative to each other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L47/00—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
    • F16L47/02—Welded joints; Adhesive joints
    • F16L47/03—Welded joints with an electrical resistance incorporated in the joint
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/36—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
    • B29C65/3672—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the composition of the elements heated by induction which remain in the joint
    • B29C65/3676—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the composition of the elements heated by induction which remain in the joint being metallic

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

Closed electric conductors are applied to the surfaces of the tubes or plates to be welded together to heat them by inductive current to the melting point of the plastic. Pref. the electrical conductor is formed as small rings on the mesh of a net which are distributed over the surface to be welded. The conductors can be placed in the ends of the tubes for butt sealing the tubes together.

Description

ScllweitSverbindunz zweier Kunststoffrohre Die Erfindung betrifft eine Schweißverbindung zweier schmelzfähiger Kunststoffrohre oder -platten mittels Induktionsschweissung. ScllweitSverbindunz two plastic pipes The invention relates to a welded joint between two fusible plastic pipes or plates by means of Induction welding.

5s sind Induktions-Schweißverfahren für Metalle bekannb, bei denen durch ßrzeugentsehr hoher Indulctionsströmo die beteiligten Metalle örtlich zum Schmelzen gebracht werden und so miteinander verschweien. 5s induction welding processes are known for metals in which by means of a very high induction current, the metals involved locally to the Melts are brought and so welded together.

Jedoch lassen sich diese Verfahren zum Verschweißen von Kunststoffrohren nicht anwenden. Besonders schwierig gestaltet sich das Verschweißen von Kunststoffrohren großen Durchmessers. Des weiteren schmelzen gewisse Kunststoffe bei Sauerstoffzutritt nicht, sondern es tritt ab einer bestimmten Temperatur nur eine Schrumpfung ein. Auf jeden Fall ist das Verlegen und Verschweißen von Rohrleitungen, die absolut dicht sein müssen, sehr arbeitsintensiv. However, these methods can be used for welding plastic pipes do not apply. Welding plastic pipes is particularly difficult large diameter. Furthermore, certain plastics melt when exposed to oxygen not, but only a shrinkage occurs from a certain temperature. In any case, the laying and welding of pipelines is absolute have to be tight, very labor-intensive.

Der Erfindung liegt die Aufgabe zugrunde, eine Schweißverbiadung zweier Kunststoffrohre oder -platten zu schaffen, bei der durch Anwendung von Induktionsströmen die Rohre am Ort mit geringstem Aufwand verschweißt werden können und bei der zum Schmelzen des Kunststoffes keine offenen Flammen oder Heißluft notwendig sind. The invention is based on the object of a welding connection to create two plastic pipes or plates, when using induction currents the pipes can be welded on site with very little effort and at the for Melting the plastic no open flames or hot air are necessary.

Die Lösung dieser Aufgabe besteht erfindungsgemäß darin, daß auf den zu verschweißenden Flächen der Kunststoffrohre oder der Platten geschlossene elektrische Leiter aufgebracht und diese durch Induktionsströme bis zum Schmelzen des Kunststoffes erhitzbar sind. The solution to this problem is according to the invention that on the surfaces of the plastic pipes or plates to be welded are closed applied electrical conductors and these by induction currents until they melt of the plastic are heatable.

Die Erfindung besitzt den Vorteil, daß mit ihr leicht beliebige Kunststoffrohre ohne Bilden einer V-Naht oder Doppel-V-Naht verschweißt werden können. Es kann nicht mehr eintreten, daß die wandung eines Rohres durchschmilzt oder Löcher bekommt. Weiterhin ist eine genaue Steuerung des Verschmelzungsprozesses durch Regulierung der Induktionsströme möglich. Dadurch können verschieden tiefe Vermischungszonen gebildet werden. Ein besonderer Vorteil gemäß der Erfindung besteht darin, daß die Schweißverbindung auch bei dickwandigen Rohren völlig homogen wird. The invention has the advantage that any plastic pipes can easily be used with it can be welded without forming a V-seam or double V-seam. It can't more occur that the wall of a pipe melts or Gets holes. Furthermore, there is precise control of the merging process possible by regulating the induction currents. This allows different depths Mixing zones are formed. There is a particular advantage according to the invention in that the welded joint is completely homogeneous even with thick-walled pipes.

Bei einer bevorzugten Ausführung der Erfindung sind die geschlos senen elektrischen Leiter zwischen zwei übereinandergeschobenen Rohrenden angeordnet und umfassen diese konzentrisch. Zum Verschweißen brauchen die Rohrenden nur von einer Induktionsspule umfaßt zu werden. Die in den Leitern auftretenden Induktionsströme erhitzen die Leiter so stark, daß der Kunststoff schmilzt und so die übereinandergelegten oder sich berührenden Flächen miteinander verschweißen. In a preferred embodiment of the invention, they are closed These electrical conductors are arranged between two pipe ends pushed one on top of the other and embrace them concentrically. The pipe ends only need from for welding an induction coil to be included. The induction currents occurring in the conductors heat the conductors so much that the plastic melts and so does the superimposed ones or weld contacting surfaces together.

Sollen dickwandige Rohre miteinander verbünden werden, so können die elektrischen Leiter in der Stirnwand angeordnet sein. Auch hier sind die Leiter konzentrische Kreise um die Rohrachse. Um die geßarnte Berührungsfläche mit einem einzigen Loitçr zu erfassen, kann derselbe mäanderförmig verlegt sein. Zum Verschweißen werden die Rohre Stoß an Stoß verlegt und aneinandergepreßt. If thick-walled pipes are to be connected to one another, so can the electrical conductors can be arranged in the end wall. Here, too, are the leaders concentric circles around the pipe axis. To the geßarnte touch area with a To capture a single Loitçr, the same can be laid in a meander shape. For welding the pipes are laid end to end and pressed together.

In einer weiteren Ausführung der Erfindung bestehen die elektrischen Leiter aus Ringen mit geringem Durchmesser, die an den zu verschweißenden Stellen des Kunststoffes in diesen eingebettet sind. Dadurch ergibt sich der Vorteil, daß die Rohre oder die Platten abschnittsweise bzw. lokal begrenzt verschweißt werden können. Diese erfindungsgemäße Variante eignet sich besonders zum Verschweißen dickwandiger Rohre mit großem Durchmesser. Die zum Schmelzen des Kunststoffs notwendige Energie muß hierbei nicht auf einmal aufgebracht werden. Die erwähnten Ringe- können auch durch die Maschen eines elektrisch leitenden netzes gebildet werden, das auch erst unmittelbar vor dem Schweißvorgang aufgebracht zu werden braucht. Vorteil ist hierbei, daß das Rohr keine speziellen Einlagen benötigt und auf beliebige Länge geschnitten werden kann. In a further embodiment of the invention, there are electrical Ladder made of small-diameter rings attached to the points to be welded of the plastic are embedded in them. This has the advantage that the tubes or the plates are welded in sections or in a locally limited manner can. This variant according to the invention is particularly suitable for welding thick-walled ones Large diameter pipes. The energy needed to melt the plastic does not have to be applied all at once. The mentioned rings can also be formed by the mesh of an electrically conductive network, which is also only needs to be applied immediately before the welding process. The advantage here is that the pipe no special insoles required and on any Length can be cut.

In einer speziellen Ausführungsform können die vorstehend genannten elektrischen Leiter auch aus fein verteilten, in die Kunststoffmasse eingebetteten elektrisch leitenden Partikeln bestehen. In a special embodiment, the aforementioned electrical conductors also made of finely distributed, embedded in the plastic compound electrically conductive particles exist.

Beispiele der Erfindung sind in der Zeichnung dargestellt und nachstehend beschrieben. Dabei zeigt: Fig.1 einen Längsschnitt durch zwei zu verschweißende Rohre, die konusförmig ineinandergeschoben und in die elektrische Leiter eingebettet sind. Examples of the invention are illustrated in the drawing and below described. It shows: FIG. 1 a longitudinal section through two to be welded Tubes that are pushed together in a cone shape and embedded in the electrical conductor are.

Fig.2 eine weitere Anordnung der elektrischen Leiter in der Grenzfläche der beiden Rohre. 2 shows a further arrangement of the electrical conductors in the interface of the two pipes.

Fig.3 die Anordnung eines mäanderförmigen elektrischen Leiters in der Stirnwand eines Rohres Fig.4 die Verteilung von kleinen, konzentrischen und elektrisch leitenden Ringen in der Stirnfläche eines Rohres Fig.5 zwei übereinandergelegte abgeschrägte Kunststoffplatten, wobei in den Berührungsflächen kleine konzentrische' und elektrisch leitende Ringe eingebettet sind und Fig.6 eine Seitenansicht gemäß Fig.5. 3 shows the arrangement of a meandering electrical conductor in the end wall of a pipe Fig.4 the distribution of small, concentric and electrically conductive rings in the end face of a pipe Fig.5 two superimposed bevelled plastic plates, with small concentric ' and electrically conductive rings are embedded and FIG. 6 shows a side view according to Fig. 5.

In Figur 1 sind mit 1 und 2 zwei Kunststoffrohre bezeichnet, die einen konischen Paßsitz haben. Längs der Berührungsfläche sind in die Kunststoffwandung beider ( oder auch nur eines der ) Rohre geschlossene elektrische Leiter eingebettet. Diese Leiter bestehen aus einem geeigneten Widerstandsdraht, aus Kupferdraht oder aus elektrisch leitenden Partikeln. Die Leiter können schon beim Fabrikationsprozeß in die Rohre eingebettet werden. In Figure 1, 1 and 2 denote two plastic pipes, the have a conical fit. Along the contact surface are in the plastic wall both (or only one of the) tubes embedded closed electrical conductors. These conductors consist of a suitable resistance wire, copper wire or made of electrically conductive particles. The ladder can already be used during the manufacturing process be embedded in the pipes.

In Figur 2 sind zwei Kunststoffröhren 5 und 6, die ebenfalls einen konischen Sitz aufweisen, in der Berührungsfläche nachträglich mit konzentrischen Leitern 7 versehen worden. Die Leiter werden entsprechend ihres Durchmesser auf das kegelstumpfförmige Ende des Rohres 6 aufgesteckt und das Rohr 5 darübergeschoben. In Figure 2 are two plastic tubes 5 and 6, which also have one have conical seat, in the contact surface subsequently with concentric Ladders 7 have been provided. The conductors are based on their diameter the frustoconical end of the Tube 6 attached and the tube 5 pushed over it.

Sollen zwei Rohre Stoß an stoß verlegt werden, so werden die elektrischen Leiter in die Stirnfläche der Rohre eingebracht. In Figur 3 ist in einem zylindrischen Rohr 8 ein geschlossener elektrischer Leiter 9 einyebettet, der zur Erfassung einer möglichst großen Oberfläche mäanderförmig angeordnet ist. If two pipes are to be laid end to end, the electrical Conductor introduced into the end face of the pipes. In Figure 3 is in a cylindrical Tube 8 embeds a closed electrical conductor 9, which is used to detect a The largest possible surface is arranged in a meander shape.

In den Figuren 4,5 und 6 ist ein weiteres Ausführungsbeispiel der Erfindung därgestellt. In die stirnwand einer zylindrischen Kunststoffröhre 1d sind kleine konzentrische Leiter 11 eingebettet. Ebenso können auf diese Weise Kunststoffplatten verschweißt werden. In die gemeinsame Berührungaflfiche zweier Kunotstoffplatten 12, 13 sind ebenfalls kleine geschlossene Leiter 14 eingelegt. A further exemplary embodiment is shown in FIGS. 4, 5 and 6 Invention represented. In the end wall of a cylindrical plastic tube 1d are small concentric conductors 11 embedded. Plastic sheets can also be used in this way be welded. In the joint contact area of two plastic panels 12, 13 small closed conductors 14 are also inserted.

Zum Verschweißen der Röhren oder der Platten müssen in den Leitern Ströme induziert werden. Zu diesem Zweck werden die Röhren gemäß den Figuren 1 bis 3 von einer geeigneten Induktionsspule umfaßt. Die Induktionsströme bringen dann den Kunststoff zum Schmelzen wodurch die Berührungsflächen der Rohre miteinander verschweilsen. To weld the tubes or the plates must be in the conductors Currents are induced. For this purpose, the tubes according to Figures 1 to 3 encompassed by a suitable induction coil. The induction currents then bring the plastic to melt causing the contact surfaces of the tubes with each other dwell.

Zum Verschweißen der Rohre gemäß Figur 4 oder der Platten gemäß den Figuren 5 und 6 muß das induzierende Feld nicht die gesamten Rohre oder Platten umfassen. Es genügt die Erzeugung eines lokal begrenzten magnetischen Wechselfeldes, wodurch die Kunststoff flächen nur örtlich schmelzen und vorschweißen. Es genügt also, mit einem Induktionamagneten Uber die zu verschweißende Flache zu fahren. For welding the tubes according to Figure 4 or the plates according to the In FIGS. 5 and 6, the inducing field does not have to cover all of the tubes or plates include. It is sufficient to generate a locally limited alternating magnetic field, as a result, the plastic surfaces only melt and pre-weld locally. It is sufficient So to drive with an induction magnet over the surface to be welded.

Claims (8)

PatentansprücheClaims 1) Schweil3verbindung zweier schmelzfähiger Kunststoffrohre oder -platten mittels Induktionsschweißung, dadurch gekennzeichnet daß auf den zu verschweißenden Flächen der Kunststoffrohre (1,2,8,1o) oder der Platten (12,13) geschlossene elektrische Leiter (3,4,7,9,11,14) aufgebracht und diese durch Induktionsströme bis zum Schmelzen des Kunststoffes erhitzbar sind.1) Welding connection between two fusible plastic pipes or plates by means of induction welding, characterized in that on the to be welded Surfaces of the plastic pipes (1,2,8,1o) or the plates (12,13) closed electrical Head (3,4,7,9,11,14) applied and this by induction currents until it melts of the plastic are heatable. 2) Schweißverbindung nach An#spruch 1, dadurch gekennzeichnet, daß die elektrischen Leiter (3,4,7) zwischen zwei übereinandergeschobenen Rohrenden angeordnet sind und diese konzentrisch umfassen.2) welded joint according to claim 1, characterized in that the electrical conductors (3, 4, 7) between two pipe ends pushed one on top of the other are arranged and encompass them concentrically. )) Schweißverbindung nach Anspruch li dadurch gekennzeichnet, daß die Leiter (9) bei Stoß-an-Stoß-Verlegung der rohre (8) in der Stirnwand angeordnet sind.)) Welded connection according to claim li, characterized in that the conductors (9) are arranged in the front wall when the pipes (8) are laid butt-to-butt are. 4) Schweißverbíndung nach Anspruch 1 bis 3, dadurch gekennzeichnet, daß die elektrischen Leiter-kleine Ringe (11,14) oder die Maschen eines netzes sind, die über die zu verschweissende Fläche verteilt sind.4) welded connection according to claim 1 to 3, characterized in that that the electrical conductors are small rings (11, 14) or the meshes of a network, which are distributed over the area to be welded. 5) Schweißverbindung nach Anspruch 3, dadurch gekennzeichnet, daß die Leiter mäanderförmig angeordnet sind.5) welded joint according to claim 3, characterized in that the conductors are arranged in a meandering shape. 6) Schweißverbindung nach Anspruch 1 bis 5, dadurch gekennzeichnet, daß die Leiter in den Kunststoff eingebettet sind.6) welded joint according to claim 1 to 5, characterized in that that the conductors are embedded in the plastic. 7) Schweißverbindung nach den Ansprüchen 1 bis 6, dadurch gekennzeichnet, daß die Leiter aus Widerstandsdraht bestehen.7) welded joint according to claims 1 to 6, characterized in that that the conductors are made of resistance wire. 8) Schweißverbindung nach den Ansprüchen 1 bis 6, dadurch gekennzeichnet, daß die Leiter aus in den Kunststoff eingebetteten elektrisch leitenden Partikeln bestehen.8) welded joint according to claims 1 to 6, characterized in that that the conductors are made of electrically conductive particles embedded in the plastic exist. L e e r s e i t eL e r s e i t e
DE2136656A 1971-07-22 1971-07-22 Inductive heating current - used to heat-seal two thermoplastic tubes together Pending DE2136656A1 (en)

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4514243A (en) * 1982-07-09 1985-04-30 Dan T. Moore Co. Tire for wheelchairs and the like
EP0572546A1 (en) * 1991-02-20 1993-12-08 Uponor Aldyl Company System and method for joining plastic materials
WO1995021737A1 (en) * 1994-02-08 1995-08-17 Uponor Limited Method of joining elongate hollow members
EP0780620A1 (en) * 1995-12-19 1997-06-25 Karl-Heinz Krah GmbH Werkzeug- und Vorrichtungsbau Pipe or similar element with electrical socket, process for making the electrical socket and process for making the joint between two such pipes or similar elements
DE19919289A1 (en) * 1999-04-28 2000-11-02 Mahle Filtersysteme Gmbh Forming sealed plastic closure on end edges of zig-zag folded strip of filter, especially ring filter, comprises melting one layer containing inductively heatable particles
DE10023953A1 (en) * 2000-05-16 2001-04-19 Bosch Gmbh Robert Welding method for thermoplastic plastic components, especially pressure tight connections, in which a conductor is placed between both components and connected to an external energy source
EP1408173A1 (en) * 2002-10-11 2004-04-14 Gianmaria Guidi Covering for protecting surfaces in general
WO2004065108A1 (en) * 2003-01-22 2004-08-05 Hydac Technology Gmbh Method for producing an accumulator bladder
FR3058355A1 (en) * 2016-11-04 2018-05-11 Saipem S.A. METHOD OF ASSEMBLING THERMOPLASTIC TUBES BY INDUCTION WELDING
US11441719B2 (en) 2016-11-04 2022-09-13 Saipem S.A. Method and device for induction heating of an inner pipe of an assembly of coaxial pipes

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4514243A (en) * 1982-07-09 1985-04-30 Dan T. Moore Co. Tire for wheelchairs and the like
EP0572546A1 (en) * 1991-02-20 1993-12-08 Uponor Aldyl Company System and method for joining plastic materials
EP0572546A4 (en) * 1991-02-20 1995-01-18 Metcal Inc System and method for joining plastic materials.
WO1995021737A1 (en) * 1994-02-08 1995-08-17 Uponor Limited Method of joining elongate hollow members
EP0780620A1 (en) * 1995-12-19 1997-06-25 Karl-Heinz Krah GmbH Werkzeug- und Vorrichtungsbau Pipe or similar element with electrical socket, process for making the electrical socket and process for making the joint between two such pipes or similar elements
DE19919289A1 (en) * 1999-04-28 2000-11-02 Mahle Filtersysteme Gmbh Forming sealed plastic closure on end edges of zig-zag folded strip of filter, especially ring filter, comprises melting one layer containing inductively heatable particles
DE10023953A1 (en) * 2000-05-16 2001-04-19 Bosch Gmbh Robert Welding method for thermoplastic plastic components, especially pressure tight connections, in which a conductor is placed between both components and connected to an external energy source
EP1408173A1 (en) * 2002-10-11 2004-04-14 Gianmaria Guidi Covering for protecting surfaces in general
US6812438B2 (en) 2002-10-11 2004-11-02 Gianmaria Guidi Covering for protecting surfaces in general
WO2004065108A1 (en) * 2003-01-22 2004-08-05 Hydac Technology Gmbh Method for producing an accumulator bladder
FR3058355A1 (en) * 2016-11-04 2018-05-11 Saipem S.A. METHOD OF ASSEMBLING THERMOPLASTIC TUBES BY INDUCTION WELDING
WO2018083397A1 (en) * 2016-11-04 2018-05-11 Saipem S.A. Method for assembling thermoplastic tubes by induction welding
US11338526B2 (en) 2016-11-04 2022-05-24 Saipem S.A. Method for assembling thermoplastic tubes by induction welding
US11441719B2 (en) 2016-11-04 2022-09-13 Saipem S.A. Method and device for induction heating of an inner pipe of an assembly of coaxial pipes

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