CH349404A - Welding sleeve for producing a welded joint of interlocking molded bodies made of thermoplastics, use of this welding sleeve and method for producing it - Google Patents

Welding sleeve for producing a welded joint of interlocking molded bodies made of thermoplastics, use of this welding sleeve and method for producing it

Info

Publication number
CH349404A
CH349404A CH349404DA CH349404A CH 349404 A CH349404 A CH 349404A CH 349404D A CH349404D A CH 349404DA CH 349404 A CH349404 A CH 349404A
Authority
CH
Switzerland
Prior art keywords
welding
welding sleeve
producing
molded bodies
sleeve
Prior art date
Application number
Other languages
German (de)
Inventor
Riegen Johannes Dipl-Ing Von
Bauer Hans
Original Assignee
Sued West Chemie Gmbh
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sued West Chemie Gmbh filed Critical Sued West Chemie Gmbh
Publication of CH349404A publication Critical patent/CH349404A/en

Links

Classifications

    • 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"
    • B29C65/3404—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" characterised by the type of heated elements which remain in the joint
    • B29C65/342—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" characterised by the type of heated elements which remain in the joint comprising at least a single wire, e.g. in the form of a winding
    • 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"
    • B29C65/3404—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" characterised by the type of heated elements which remain in the joint
    • B29C65/342—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" characterised by the type of heated elements which remain in the joint comprising at least a single wire, e.g. in the form of a winding
    • B29C65/3432—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" characterised by the type of heated elements 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
    • 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"
    • B29C65/3472—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" characterised by the composition of the heated elements which remain in the joint
    • B29C65/3476—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" characterised by the composition of the heated elements which remain in the joint being metallic
    • 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
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/122—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
    • B29C66/1222—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least a lapped joint-segment
    • 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
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/122—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
    • B29C66/1224—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least a butt joint-segment
    • 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
    • B29C66/50—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
    • B29C66/5229—Joining tubular articles involving the use of a socket
    • B29C66/52291—Joining tubular articles involving the use of a socket said socket comprising a stop
    • B29C66/52292—Joining tubular articles involving the use of a socket said socket comprising a stop said stop being internal
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14598—Coating tubular articles
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14598—Coating tubular articles
    • B29C45/14614—Joining tubular articles
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14639—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles for obtaining an insulating effect, e.g. for electrical components
    • 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"
    • B29C65/3468—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" characterised by the means for supplying heat to said heated elements which remain in the join, e.g. special electrical connectors of 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
    • B29C66/70—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
    • B29C66/71—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 composition of the plastics material of the parts to be joined

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Branch Pipes, Bends, And The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Description

       

  
 



   Schweisshülse zur Herstellung einer Schweissverbindung von ineinandergreifenden Formkörpern aus thermoplastischen Kunststoffen,
Verwendung dieser Schweisshülse und Verfahren zu ihrer Herstellung
Die Erfindung bezieht sich auf eine Schweisshülse zur Herstellung einer Schweissverbindung von ineinandergreifenden Formkörpern aus thermoplastischen Kunststoffen unter Zwischenlegen eines Heizleiters, gekennzeichnet durch im Abstand voneinander angeordnete Windungen eines Heizleiters, welche durch eine Schicht eines thermoplastischen Kunststoffs verbunden sind. Diese Schicht ist zweckmässig nicht wesentlich dicker als der Durchmesser des Heizleiters. Sie kann auch etwas dünner sein.



   Weiter bezieht sich die Erfindung auf die Verwendung dieser Schweisshülse zur Herstellung von zusammengesetzten, ineinandergreifenden, durch elektrisches Verschweissen zu verbindenden Formkörpern aus thermoplastischen Kunststoffen, dadurch gekennzeichnet, dass man die Schweisshülse oder Schweisshülsen mit einem der durch Verschweissen zu verbindenden Formkörper vor dem Vereinigen der beiden Formkörper verbindet.



   Die Formkörper können Rohre oder Rohrverbinder (Fittings) sein. Als thermoplastischer Kunststoff kommt z. B. Polyäthylen in Frage.



   Das Verschweissen ineinandergreifender Formkörper aus thermoplastischen Kunststoffen, z. B.



  Rohren und Rohrverbindern, unter Erhitzen der Ein  griffsflächen    der zu verbindenden Formkörper mittels eines zwischengelegten, elektrisch beheizten Heizleiters ist bekannt.



   Die bisherigen Vorschläge brachten eine Reihe von Nachteilen mit sich; ihre Anwendung in der Praxis gelang nicht oder war beschränkt.



   Diese Nachteile können gemäss der Erfindung behoben werden, da man bei der Schweisshülse durch Anlegen eines elektrischen Stromes an die Drahtwindungen die dünne Kunststoffschicht zum Schmelzen bringen und die der Hülse benachbarten Kunststoffteile der zu verbindenden Formkörper erhitzen kann.



   Man kann das Verschweissen unter Zwischenlegen der Schweisshülse zwischen die zu verbindenden Flächen, z. B. die Aussenfläche eines Rohres und die Innenfläche eines Fittings, und Anlegen eines Stromes an die Enden der Drahtwicklung vornehmen. Hierbei schmilzt die die Drahtwindungen verbindende, verhältnismässig dünne Kunststoffschicht, und es schmelzen die benachbarten Teile des Kunststoffs der zu verbindenden Formkörper, unter Bildung einer die Drahtwindung und den Kunststoff der Schweisshülse einschliessenden Schweissverbindung.



   Die Schweisshülse kann vor der Vereinigung der ineinandergreifenden Formkörper aus thermoplastischen Kunststoffen mit einem dieser Formkörper verbunden werden, z. B. mit einem Fitting, während dessen Herstellung durch Spritzen.



   Die Herstellung der Schweisshülse kann auf beliebige an sich bekannte Weise, z. B. dadurch erfolgen, dass die Windungen des Heizdrahtes in eine Schmelze des thermoplastischen Kunststoffs eingetaucht werden.



   Die Schichtdicke des thermoplastischen Kunststoffs der Hülse ist vorzugsweise über die gesamte Hülse gleichmässig verteilt; es können jedoch auch Erhöhungen oder Vertiefungen vorgesehen sein.



   Als thermoplastischer Kunststoff für die Schweisshülse wird vorzugsweise ein Kunststoff verwendet mit einem verhältnismässig niedrigen Erweichungspunkt bzw. Schmelzpunkt, wobei Voraussetzung ist, dass der Kunststoff der Schweisshülse sich mit dem Kunststoff der zu vereinigenden Teile zu verbinden vermag.  



   Das Erhitzen der Drahtwindungen kann anstelle des Einschaltens in einen Stromkreis auch durch Einbringen der vereinigten Teile in ein Wechselstromfeld erfolgen.



   Für diese Art der Ausführung der Verschweissung werden die Schweisshülsen vorzugsweise in Form langer Rohre, die zu Stücken der benötigten Länge geschnitten werden können, hergestellt.



   Die Form der Schweisshülse richtet sich nach der Form der zu verbindenden Formkörper. In der Regel besitzt die Schweisshülse zylindrische Form.



   Die Zeichnung zeigt bevorzugte Ausführungsformen der Erfindung:
Fig. 1 zeigt teilweise im axialen Schnitt, teilweise in Ansicht den mit einem thermoplastischen Kunststoff zu der Schweisshülse vereinigten Heizleiter.



   Fig. 2 zeigt teilweise im axialen Schnitt, teilweise in Ansicht die Anordnung der Schweisshülse auf dem Kern einer zur Herstellung eines   Rohrverbinders    dienenden Spritzgussform.



   Fig. 3 erläutert das Verschweissen zweier Rohrenden mit einem Rohrverbinder.



   Der bifilar gewickelte Heizleiter 1, dessen Windungen in gleichmässigen Abständen voneinander angeordnet sind, ist mit einem thermoplastischen Kunststoff 2 zu einem hülsenförmigen Körper vereinigt.



  Die Windungen des Heizleiters liegen also in der Wandung einer Kunststoffhülse. Die beiden Anschlussenden 3, 4 des Heizleiters ragen stirnseitig aus der Wandung der Hülse heraus.



   Die den Heizleiter enthaltende Hülse kann wie schon erwähnt im Zuge der Herstellung eines Formkörpers, z. B. eines Rohrverbinders, mit diesem vereinigt werden.



   Zu diesem Zweck kann gemäss Fig. 2 die Hülse auf dem Kern 5 einer zur Herstellung des Rohrverbinders dienenden Spritzgussform 6 angeordnet werden, wobei die Anschlussenden 3, 4 des Heizleiters ausserhalb des formgebenden Hohlraumes der Spritzgussform liegen.



   Einen auf diese Weise hergestellten Rohrverbinder 7, welcher zwei Heizleiterhülsen 1, 2 enthält und zum Verbinden zweier Rohrenden 8, 9 dient, zeigt Fig. 3.



   Durch Anlegen einer Stromquelle an die Anschlussenden 3, 4 des Heizleiters wird der Heizleiter und der ihn umgebende Kunststoff erwärmt, wodurch eine homogene Verschweissung der zu verbindenden Teile herbeigeführt wird.



   Derartige Schweissverbindungen können durch elektrisches Erhitzen des in die Schweissverbindung eingebetteten Heizdrahtes wieder gelöst werden.   



  
 



   Welding sleeve for the production of a welded joint of interlocking moldings made of thermoplastics,
Use of this welding sleeve and process for its manufacture
The invention relates to a welding sleeve for producing a welded joint of interlocking molded bodies made of thermoplastic plastics with the interposition of a heating conductor, characterized by spaced-apart turns of a heating conductor which are connected by a layer of thermoplastic plastics. This layer is expediently not significantly thicker than the diameter of the heating conductor. It can also be a little thinner.



   The invention also relates to the use of this welding sleeve for the production of assembled, interlocking molded bodies made of thermoplastic plastics to be connected by electrical welding, characterized in that the welding sleeve or welding sleeves are connected to one of the molded bodies to be connected by welding before the two molded bodies are combined connects.



   The shaped bodies can be pipes or pipe connectors (fittings). As a thermoplastic material z. B. polyethylene in question.



   The welding of interlocking molded bodies made of thermoplastics, e.g. B.



  Pipes and pipe connectors, with heating of the gripping surfaces of the molded body to be connected by means of an interposed, electrically heated heating conductor is known.



   The previous proposals had a number of disadvantages; their practical application was unsuccessful or limited.



   These disadvantages can be remedied according to the invention, since in the welding sleeve, by applying an electric current to the wire windings, the thin plastic layer can be melted and the plastic parts of the molded bodies to be connected adjacent to the sleeve can be heated.



   You can do the welding with the interposition of the welding sleeve between the surfaces to be connected, for. B. make the outer surface of a pipe and the inner surface of a fitting, and apply a current to the ends of the wire winding. Here, the relatively thin plastic layer connecting the wire turns melts, and the adjacent parts of the plastic of the molded bodies to be connected melt, forming a welded joint enclosing the wire turn and the plastic of the welding sleeve.



   The welding sleeve can be connected to one of these molded bodies before the interlocking molded bodies made of thermoplastics are combined, e.g. B. with a fitting, during its manufacture by spraying.



   The welding sleeve can be manufactured in any known manner, e.g. B. be done in that the turns of the heating wire are immersed in a melt of the thermoplastic material.



   The layer thickness of the thermoplastic plastic of the sleeve is preferably evenly distributed over the entire sleeve; however, elevations or depressions can also be provided.



   The thermoplastic plastic used for the welding sleeve is preferably a plastic with a relatively low softening point or melting point, with the prerequisite that the plastic of the welding sleeve is able to bond with the plastic of the parts to be combined.



   The heating of the wire windings can also be done by placing the combined parts in an alternating current field instead of switching them on into a circuit.



   For this type of welding, the welding sleeves are preferably made in the form of long tubes that can be cut into pieces of the required length.



   The shape of the welding sleeve depends on the shape of the molded body to be connected. As a rule, the welding sleeve has a cylindrical shape.



   The drawing shows preferred embodiments of the invention:
Fig. 1 shows partially in axial section, partially in view of the heating conductor combined with a thermoplastic material to form the welding sleeve.



   FIG. 2 shows, partly in axial section and partly in view, the arrangement of the welding sleeve on the core of an injection mold used to produce a pipe connector.



   Fig. 3 explains the welding of two pipe ends with a pipe connector.



   The bifilar-wound heating conductor 1, the turns of which are arranged at regular intervals from one another, is combined with a thermoplastic material 2 to form a sleeve-shaped body.



  The turns of the heating conductor are therefore in the wall of a plastic sleeve. The two connection ends 3, 4 of the heating conductor protrude at the front from the wall of the sleeve.



   The sleeve containing the heating conductor can, as already mentioned, in the course of the production of a molded body, e.g. B. a pipe connector, are combined with this.



   For this purpose, according to FIG. 2, the sleeve can be arranged on the core 5 of an injection mold 6 used to manufacture the pipe connector, the connection ends 3, 4 of the heating conductor being outside the shaping cavity of the injection mold.



   A pipe connector 7 produced in this way, which contains two heating conductor sleeves 1, 2 and is used to connect two pipe ends 8, 9, is shown in FIG. 3.



   By applying a current source to the connection ends 3, 4 of the heating conductor, the heating conductor and the plastic surrounding it are heated, which brings about a homogeneous welding of the parts to be connected.



   Such welded connections can be released again by electrically heating the heating wire embedded in the welded connection.

Claims (1)

PATENTANSPRÜCHE I. Schweisshülse zur Herstellung einer Schweissverbindung von ineinandergreifenden Formkörpern aus thermoplastischen Kunststoffen unter Zwischenlegen eines Heizleiters, gekennzeichnet durch im Abstand voneinander angeordnete Windungen eines Heizleiters, welche durch eine Schicht eines thermoplastischen Kunststoffs verbunden sind. PATENT CLAIMS I. Welding sleeve for producing a welded connection of interlocking molded bodies made of thermoplastics with the interposition of a heating conductor, characterized by spaced turns of a heating conductor which are connected by a layer of a thermoplastic. II. Verwendung der Schweisshülse gemäss Patentanspruch I zur Herstellung von zusammengesetzten, ineinandergreifenden, durch elektnscheis Verschweissen zu verbindenden Formkörpern aus thermoplastischen Kunststoffen, dadurch gekennzeichnet, dass man die Schweisshülse oder Schweisshülsen mit einem der durch Verschweissen zu verbindenden Formkörper vor dem Vereinigen der beiden Formkörper verbindet. II. Use of the welding sleeve according to claim I for the production of assembled, interlocking molded bodies made of thermoplastic plastics to be connected by electrical welding, characterized in that the welding sleeve or welding sleeves are connected to one of the molded bodies to be connected by welding before the two molded bodies are combined. III. Verfahren zur Herstellung einer Schweisshülse gemäss Patentanspruch I, dadurch gekennzeichnet, dass der thermoplastische Kunststoff in plastischem, flüssigem, suspendiertem oder gelöstem Zustand auf die im Abstand voneinander angeordneten Windungen der Heizleiterwicklung aufgebracht wird. III. Method for producing a welding sleeve according to patent claim 1, characterized in that the thermoplastic material is applied in a plastic, liquid, suspended or dissolved state to the turns of the heating conductor winding which are arranged at a distance from one another. UNTERANSPRÜCHE 1. Verwendung gemäss Patentanspruch II, dadurch gekennzeichnet, dass man die Schweisshülse mit Rohren oder Rohrverbindern verbindet. SUBCLAIMS 1. Use according to claim II, characterized in that the welding sleeve is connected to pipes or pipe connectors. 2. Verwendung gemäss Unteranspruch 1, dadurch gekennzeichnet, dass die Rohre oder Rohrverbinder aus Polyäthylen bestehen. 2. Use according to dependent claim 1, characterized in that the pipes or pipe connectors are made of polyethylene. 3. Verwendung gemäss Patentanspruch II, dadurch gekennzeichnet, dass man die Schweisshülse auf den Kern einer Spritzform aufbringt und sie dort mit einem Fitting aus thermoplastischem Kunststoff durch Umspritzen und/oder Einspritzen verbindet. 3. Use according to claim II, characterized in that the welding sleeve is applied to the core of an injection mold and connected there to a fitting made of thermoplastic material by overmolding and / or injection.
CH349404D 1955-07-22 1956-07-18 Welding sleeve for producing a welded joint of interlocking molded bodies made of thermoplastics, use of this welding sleeve and method for producing it CH349404A (en)

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Application Number Priority Date Filing Date Title
DE1170720X 1955-07-22

Publications (1)

Publication Number Publication Date
CH349404A true CH349404A (en) 1960-10-15

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CH (1) CH349404A (en)
FR (1) FR1170720A (en)
GB (1) GB809560A (en)
LU (1) LU34517A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3226575C1 (en) * 1982-07-16 1984-03-01 Friedrichsfeld Gmbh, Steinzeug- Und Kunststoffwerke, 6800 Mannheim Device for connecting
WO1997027418A1 (en) * 1996-01-24 1997-07-31 Uponor Aldyl Company Apparatus and method for fusion joining a pipe and fittings

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL236188A (en) * 1958-02-17
US4508368A (en) * 1982-03-01 1985-04-02 R & G Sloane Mfg. Co., Inc. Plastic pipe joint
US4852914A (en) * 1987-06-19 1989-08-01 Milfuse Systems, Inc. Plastic pipeline having rapidly fusible joints and method of making same
GB2272663B (en) * 1992-01-06 1996-09-25 Kubota Kk A method of manufacturing a plastic pipe
FR2691369A1 (en) * 1992-05-25 1993-11-26 Taylor Made Golf Co Improvement for golf club.
GB2282102B (en) * 1993-09-06 1998-02-04 Uponor Aldyl Ltd Improvements in or relating to pipe fittings
FR2963654B1 (en) † 2010-08-06 2013-12-13 Saipem Sa DRIVING COMPRISING AN INTERNAL SHAPING AND A TUBULAR JUNCTION SLEEVE OF PLASTIC MATERIAL

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3226575C1 (en) * 1982-07-16 1984-03-01 Friedrichsfeld Gmbh, Steinzeug- Und Kunststoffwerke, 6800 Mannheim Device for connecting
WO1997027418A1 (en) * 1996-01-24 1997-07-31 Uponor Aldyl Company Apparatus and method for fusion joining a pipe and fittings
EP1054206A2 (en) * 1996-01-24 2000-11-22 Uponor Aldyl Company Apparatus and method for fusion joining a pipe and fittings
US6193834B1 (en) 1996-01-24 2001-02-27 Uponor Aldyl Company Apparatus and method for fusion joining a pipe and fittings
EP1054206A3 (en) * 1996-01-24 2001-03-07 Uponor Aldyl Company Apparatus and method for fusion joining a pipe and fittings

Also Published As

Publication number Publication date
LU34517A1 (en)
GB809560A (en) 1959-02-25
FR1170720A (en) 1959-01-16

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