EP0446314A1 - Welding muff and process for manufacturing it - Google Patents

Welding muff and process for manufacturing it

Info

Publication number
EP0446314A1
EP0446314A1 EP90912857A EP90912857A EP0446314A1 EP 0446314 A1 EP0446314 A1 EP 0446314A1 EP 90912857 A EP90912857 A EP 90912857A EP 90912857 A EP90912857 A EP 90912857A EP 0446314 A1 EP0446314 A1 EP 0446314A1
Authority
EP
European Patent Office
Prior art keywords
sleeve
sleeve body
welding
thermoplastic material
reinforcing layer
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.)
Withdrawn
Application number
EP90912857A
Other languages
German (de)
French (fr)
Inventor
Thomas Strauch
Alfred Thalmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Georg Fischer AG
Original Assignee
Georg Fischer AG
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 Georg Fischer AG filed Critical Georg Fischer AG
Publication of EP0446314A1 publication Critical patent/EP0446314A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D23/00—Producing tubular articles
    • B29D23/001—Pipes; Pipe joints
    • B29D23/003—Pipe joints, e.g. straight joints
    • B29D23/005—Pipe joints, e.g. straight joints provided with electrical wiring
    • 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"
    • B29C65/3472—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
    • B29C66/11—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
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap 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
    • B29C66/50—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
    • 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
    • B29C66/52295—Joining tubular articles involving the use of a socket said socket comprising reinforcements
    • 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"
    • B29C65/3468—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
    • B29C66/72—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 structure of the material of the parts to be joined
    • B29C66/721—Fibre-reinforced materials
    • B29C66/7212—Fibre-reinforced materials characterised by the composition of the fibres
    • 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

Definitions

  • the present invention relates to a welding sleeve according to the preamble of claim 1 and a method for producing a welding sleeve.
  • Welding sleeves of the type mentioned are used in particular for connecting pipes.
  • a welding sleeve for pipes made of a thermoplastic and / or weldable material has become known from European application EP-0222 287, with a heating wire arranged on an inner surface, which is wound into a heating coil and to which current can be supplied for welding.
  • a reinforcement in the form of a winding inserted in a groove or in the form of a tubular part is arranged on the outer surface of the welding sleeve, the thermal expansion coefficient of the reinforcement being smaller than that of the sleeve body.
  • the object of the present invention to propose a welding sleeve of the type mentioned in the introduction, in which the sleeve is permanently stiff with little use of material, so that it is produced during the heating process and the welding process in order to generate the required welding pressure as well as after the pipe connection has been created to accommodate the media pressure.
  • the welding sleeve should not be susceptible to corrosion and should be able to be produced by a simple, automatic process.
  • Fig. 1 shows a longitudinal section of an embodiment of the welding sleeve.
  • Fig. 2 shows a variant of the welding sleeve shown in Fig. 1.
  • sleeve body 1 consisting of a thermoplastic material such as polyethylene, on the inner surface 2 of which in a known manner a heating wire winding 3 is arranged and which, for example connecting wires 4 or
  • a reinforcing layer 6 is arranged on the outer surface 5 of the sleeve body 1 and has a higher strength than the sleeve body 1.
  • the reinforcing layer is preferably connected to the sleeve body by a material connection.
  • the sleeve body is produced as a molded body in the injection molding process or as a pipe section in the extrusion process from a crosslinkable material which has an outer dimension including the reinforcing layer.
  • the reinforcing layer is then produced by a crosslinking reaction, it being possible to use a chemical and / or physical crosslinking process for the reinforcing effect on a determinable layer on the outer circumference of the sleeve body.
  • This crosslinking reaction can be brought about, for example, by means of silane crosslinking, by means of peroxidic crosslinking, by means of electron beam crosslinking or by means of UV radiation.
  • a cross-linking reaction is basically a hardening process that is irreversible. This means that this harder or firmer layer produced by crosslinking is not plasticized again due to the heat generated by the heating wire.
  • the reinforcing layer 6 thus counteracts the radial evasion of the sleeve material during the welding process.
  • the thermoplastic material used for the sleeve body is not suitable for good stiffening by crosslinking, a compound sleeve body can be produced from two different thermoplastic materials, the material which can be easily crosslinked being arranged cohesively on the outer circumference in a required layer thickness at the manufacturer of the sleeve body is. This production can be carried out by co-injection in an injection molded body, by co-extrusion in a pipe section or by inserting a corresponding part into the injection mold.
  • this can consist of a thermoplastic material reinforced with glass or carbon fiber.
  • This reinforcing layer 6 which has a higher rigidity than the sleeve body, is produced during the manufacture of the sleeve body by co-injection or by inserting a part into the injection mold and is then integrally connected to the sleeve body.
  • a socket body which is a pipe section, the production is carried out by the co-extraction process.
  • FIG. 2 shows a different arrangement of the reinforcement layer 6 in the sleeve body 1 than in FIG. 1. This is integrated in the outer area of the sleeve body 1 and is preferably enclosed on all sides by the thermoplastic material of the sleeve body 1 according to FIG. 2, above.
  • the sleeve body 1 is preferably an injection molded part, the reinforcement layer 6 being inserted as a tubular part 7 into the injection mold when the sleeve body is produced.
  • This tubular part can consist of a plastic reinforced with glass or carbon fibers or of another solid material, such as metal. Corrosion is ruled out due to the complete covering by the thermoplastic material. 2, below, the glass or carbon fiber is reinforced
  • Layer 6 is arranged inside the sleeve body 1 consisting of a pipe section, the production being carried out by co-extrusion.
  • the welding sleeves described above are preferably used to connect pipes with larger diameters and ensure through the integrated, higher rigidity reinforcement layer with low material use, d the build-up of a welding pressure required for a good weld connection, as well as the sufficient strength during the operating period to accommodate the occurring Stresses due to the medium pressure and external influences.

Abstract

Un manchon à souder comporte un corps tubulaire thermoplastique (1) qui présente sur sa surface intérieure un filament enroulé chauffant. Une couche de renforcement liée au corps de manchon (1) par liaison de matière et/ou de forme possède une rigidité élevée qui assure l'absorption de la pression de soudage lors du processus de soudage ainsi qu'une longévité accrue.A welding sleeve has a thermoplastic tubular body (1) which has on its inner surface a heated coiled filament. A reinforcing layer linked to the sleeve body (1) by material and / or shape bond has a high rigidity which ensures the absorption of the welding pressure during the welding process as well as an increased durability.

Description

Schweissmuffe und ein Verfahren zu deren Herstellung Welding socket and a process for its manufacture
Die vorliegende Erfindung betrifft eine Schweissmuffe gemäss dem Oberbegriff von Anspruch 1 und ein Verfahren zur Herstellung einer Schweissmuffe.The present invention relates to a welding sleeve according to the preamble of claim 1 and a method for producing a welding sleeve.
Schweiss uffen der genannten Art werden insbesondere zur Ver¬ bindung von Rohren verwendet.Welding sleeves of the type mentioned are used in particular for connecting pipes.
Aus der europäischen Anmeldeschrift EP-0222 287 ist eine Schweiss¬ muffe für Rohre aus einem thermoplastischen und/oder schweissbaren Werkstoff bekanntgeworden, mit einem an einer Innenfläche angeordneten Heizdraht, der zu einer Heizwendel gewickelt und welchem zum Schweissen Strom zuführbar ist. An der λussenflache der Schweissmuffe ist eine Armierung in Form einer in einer Nut eingelegten Wicklung oder in Form eines rohrförmigen Teiles angeordnet, wobei der thermische Ausdehnungskoeffizient der Armierung kleiner ist als der des Muffenkörpers.A welding sleeve for pipes made of a thermoplastic and / or weldable material has become known from European application EP-0222 287, with a heating wire arranged on an inner surface, which is wound into a heating coil and to which current can be supplied for welding. A reinforcement in the form of a winding inserted in a groove or in the form of a tubular part is arranged on the outer surface of the welding sleeve, the thermal expansion coefficient of the reinforcement being smaller than that of the sleeve body.
Mit dieser Armierung soll bei reduziertem Materialeinsatz für den Muffenkörper gleichwohl beim Schweissen der erforderliche Schweissdruck aufgebracht werden können. Nachteilig hierfür ist, dass nach der Herstellung des Muffen¬ körpers zusätzliche Arbeitsgänge erforderlich sind und dass die aus Metall bestehende Drahtwicklung bzw. der rohrför ige Körper gegen Korrosion nicht beständig ist, so dass eine dauerhafte Armierung der Schweissmuffe nicht gegeben ist.With this reinforcement, the required welding pressure should nevertheless be able to be applied during welding with reduced use of material for the socket body. The disadvantage of this is that additional work steps are required after the production of the socket body and that the wire winding made of metal or the tubular body is not resistant to corrosion, so that there is no permanent reinforcement of the welding socket.
Ausgehend von diesem Stand der Technik ist es Aufgabe der vor¬ liegenden Erfindung, eine Schweissmuffe der eingangs genannten Art vorzuschlagen, bei welcher bei geringem Materialeinsatz eine dauerhafte Steifigkeit der Muffe gegeben ist, so dass diese während des Aufheizprozesses und des Schweissvorganges zur Erzeugung des erforderlichen Schweissdruckes als auch nach der Erstellung der Rohrverbindung zur Aufnahme des Mediendruckes geeignet ist. Die Schweissmuffe soll nicht korrosionsanfällig und durch ein einfaches, automatisches Verfahren herstellbar sein.Starting from this prior art, it is the object of the present invention to propose a welding sleeve of the type mentioned in the introduction, in which the sleeve is permanently stiff with little use of material, so that it is produced during the heating process and the welding process in order to generate the required welding pressure as well as after the pipe connection has been created to accommodate the media pressure. The welding sleeve should not be susceptible to corrosion and should be able to be produced by a simple, automatic process.
Diese Aufgabe wird erfindungsge äss durch die kennzeichnenden Merkmale von Anspruch 1 gelöst.This object is achieved according to the invention by the characterizing features of claim 1.
Weitere vorteilhafte Ausgestaltungen der Erfindung sind in den davon abhängigen Ansprüchen gekennzeichnet.Further advantageous embodiments of the invention are characterized in the claims dependent thereon.
Die Erfindung ist in den beiliegenden Zeichnungen beispielsweise dargestellt und nachfolgend beschrieben. Es zeigen:The invention is illustrated, for example, in the accompanying drawings and described below. Show it:
Fig. 1 einen Längsschnitt einer Ausführungsform der Schweissmuffe.Fig. 1 shows a longitudinal section of an embodiment of the welding sleeve.
Fig. 2 eine Ausführungsvariante der in Fig. 1 gezeigten Schweissmuffe.Fig. 2 shows a variant of the welding sleeve shown in Fig. 1.
Fig. 1 zeigt eine Schweissmuffe mit einem aus einem thermoplasti¬ schen Material wie z.B. Polyethylen bestehenden Muffenkörper 1, an dessen Innenfläche 2 in bekannter Art und Weise eine Heizdraht- wicklung 3 angeordnet ist und welche z.B. Anschlussdrähte 4 oder1 shows a welding sleeve with a sleeve body 1 consisting of a thermoplastic material such as polyethylene, on the inner surface 2 of which in a known manner a heating wire winding 3 is arranged and which, for example connecting wires 4 or
Steckanschlüsse zum Anschliessen an eine Stromquelle aufweist. An der Aussenfläche 5 des Muffenkörpers 1 ist eine Verstärkungs¬ schicht 6 angeordnet, welche eine gegenüber dem Muffenkörper 1 höhere Festigkeit aufweist. Die Verstärkungsschicht ist vorzugs¬ weise durch eine Stoffschlussverbindung mit dem Muffenkörper verbunden.Has plug connections for connecting to a power source. A reinforcing layer 6 is arranged on the outer surface 5 of the sleeve body 1 and has a higher strength than the sleeve body 1. The reinforcing layer is preferably connected to the sleeve body by a material connection.
Folgende Arten einer an der Aussenfläche mit dem Muffenkör¬ per integrierten Verstärkungsschicht sind möglich:The following types of reinforcement layer integrated on the outer surface with the sleeve body are possible:
Der Muffenkörper wird als Formkörper im Spritzgussverfahren oder als Rohrabschnitt im Extrusionsverfahren aus einem vernetzbaren Material hergestellt, welcher eine die Verstär¬ kungsschicht einschliessende Aussenab essung aufweist.The sleeve body is produced as a molded body in the injection molding process or as a pipe section in the extrusion process from a crosslinkable material which has an outer dimension including the reinforcing layer.
Anschliessend wird die Verstärkungsschicht durch eine Ver¬ netzungsreaktion erzeugt, wobei ein chemischer und/oder physikalischer Vernetzungsprozess für den Verstärkungseffekt an einer bestimmbaren Schicht am Aussenumfang des Muffenkörpers angewendet werden kann.The reinforcing layer is then produced by a crosslinking reaction, it being possible to use a chemical and / or physical crosslinking process for the reinforcing effect on a determinable layer on the outer circumference of the sleeve body.
Diese Vernetzungsreaktion kann beispielsweise mittels Silan- vernetzung, mittels peroxidischer Vernetzung, mittels Elektro¬ nen-Strahlvernetzung oder mittels UV-Bestrahlung hervorgerufen werden.This crosslinking reaction can be brought about, for example, by means of silane crosslinking, by means of peroxidic crosslinking, by means of electron beam crosslinking or by means of UV radiation.
Eine Vernetzungsreaktion ist im Prinzip ein Härtungsvorgang, der irreversibel ist. Das bedeutet, dass diese durch Vernetzung erzeugte, härtere bzw. festere Schicht infolge der durch den Heizdraht erzeugten Wärme nicht wieder plastifiziert wird. Damit wirkt die Verstärkungsschicht 6 beim radialen Ausweichen des Muffenmaterials während des Schweissvorganges entgegen. Ist das für den Muffenkörper verwendete thermoplastische Material für eine gute Versteifung durch Vernetzung nicht geeignet, so kann ein Compound-Muffenkorper aus zwei verschiedenen thermoplastischen Materialien hergestellt werden, wobei das gut vernetzbare Material am Aussenumfang in einer erforderlichen Schichtdicke beim Her¬ steller des Muffenkörpers stoffschlüssig angeordnet ist. Diese Herstellung kann durch Co-Injektion bei einem Spritzgusskörper, durch Co-Extrusion bei einem Rohrabschnitt oder durch Einlegen eines entsprechenden Teiles in die Spritzgussform erfolgen.A cross-linking reaction is basically a hardening process that is irreversible. This means that this harder or firmer layer produced by crosslinking is not plasticized again due to the heat generated by the heating wire. The reinforcing layer 6 thus counteracts the radial evasion of the sleeve material during the welding process. If the thermoplastic material used for the sleeve body is not suitable for good stiffening by crosslinking, a compound sleeve body can be produced from two different thermoplastic materials, the material which can be easily crosslinked being arranged cohesively on the outer circumference in a required layer thickness at the manufacturer of the sleeve body is. This production can be carried out by co-injection in an injection molded body, by co-extrusion in a pipe section or by inserting a corresponding part into the injection mold.
Bei einer zweiten Art von am Aussenumfang angeordneten Verstärkungsschicht kann diese aus einem mit Glas- oder Kohlefaser verstärkten thermoplastischen Material bestehen. Diese, eine gegenüber dem Muffenkörper höhere Steifigkeit aufweisende Verstärkungsschicht 6 wird bei der Herstellung des Muffenkörpers durch Co-Injektion oder Einlegen eines Teiles in die Spritzform erzeugt und ist dann stoffschlüssig mit dem Muffenkörper verbunden. Bei einem Muffenkörper, welcher ein Rohrabschnitt ist, erfolgt dabei die Herstellung durch das Co-Extrκsionsverfahren.In the case of a second type of reinforcement layer arranged on the outer circumference, this can consist of a thermoplastic material reinforced with glass or carbon fiber. This reinforcing layer 6, which has a higher rigidity than the sleeve body, is produced during the manufacture of the sleeve body by co-injection or by inserting a part into the injection mold and is then integrally connected to the sleeve body. In the case of a socket body, which is a pipe section, the production is carried out by the co-extraction process.
Die Fig. 2 zeigt eine zur Fig. 1 unterschiedliche Anordnung der Verstärkungsschicht 6 im Muffenkörper 1. Diese ist im äusseren Bereich des Muffenkörpers 1 integriert angeordnet und vorzugs¬ weise gemäss Fig. 2, oben, allseitig vom thermoplastischen Material des Muffenkörpers 1 umschlossen.FIG. 2 shows a different arrangement of the reinforcement layer 6 in the sleeve body 1 than in FIG. 1. This is integrated in the outer area of the sleeve body 1 and is preferably enclosed on all sides by the thermoplastic material of the sleeve body 1 according to FIG. 2, above.
Vorzugsweise ist hierbei der Muffenkörper 1 ein Spritzgussteil, wobei die Verstärkungsschicht 6 als rohrförmiges Teil 7 beim Herstellen des Muffenkörpers in die Spritzgussform eingelegt wird.In this case, the sleeve body 1 is preferably an injection molded part, the reinforcement layer 6 being inserted as a tubular part 7 into the injection mold when the sleeve body is produced.
Dieser rohrförmige Teil kann aus einem mit Glas- oder Kohlestoff- Fasern verstärkten Kunststoff oder aus einem anderen, festen Material, wie z.B. Metall bestehen. Durch die vollkommene ümmantelung durch das thermoplastische Material ist eine Korrosio ausgeschlossen. Gemäss Fig. 2, unten, ist die aus Glas- oder Kohlfasern verstärThis tubular part can consist of a plastic reinforced with glass or carbon fibers or of another solid material, such as metal. Corrosion is ruled out due to the complete covering by the thermoplastic material. 2, below, the glass or carbon fiber is reinforced
Schicht 6 innerhalb dem aus einem Rohrabschnitt bestehenden Muf fenkörper 1 angeordnet, wobei die Herstellung durch Co-Extrusio erfolgt.Layer 6 is arranged inside the sleeve body 1 consisting of a pipe section, the production being carried out by co-extrusion.
Die vorgängig beschriebenen Schweissmuffen werden vorzugsweise Verbinden von Rohren mit grösserem Durchmesser verwendet und gewährleisten durch die integrierte, eine höhere Steifigkeit aufweisende Verstärkungsschicht bei geringem Materialeinsatz, d für eine gute Schweissverbindung erforderlichen Aufbau eines Schweissdruckes sowie auch die genügende Festigkeit während der Betriebsdauer zur Aufnahme der dabei auftretenden Beanspruchun¬ gen durch den Mediumsdruck und äusseren Einflüssen.The welding sleeves described above are preferably used to connect pipes with larger diameters and ensure through the integrated, higher rigidity reinforcement layer with low material use, d the build-up of a welding pressure required for a good weld connection, as well as the sufficient strength during the operating period to accommodate the occurring Stresses due to the medium pressure and external influences.
Durch die Stoffschluss- und/oder Formschlussverbindung der Verstärkungsschicht mit dem Muffenkörper kann diese neben radia wirkenden auch axial wirkende Kräfte aufnehmen. Due to the material connection and / or positive connection of the reinforcement layer with the sleeve body, this can absorb not only radially acting but also axially acting forces.

Claims

P a t e n t a n s p r ü c h e Patent claims
1. Schweissmuffe mit einem Muffenkörper aus einem thermoplastischen Material, wobei der Muffenkörper eine Verstärkung aufweist und mit einer an einer Innenfläche angeordneten Widerstandsdrahtwicklung, dadurch gekennzeichnet, dass der Muffenkörper (1) mindestens eine mit diesem integrierte Verstärkungsschicht (6) aufweist, welche eine gegenüber dem Material des Muffenkörpers (1) höhere Steifigkeit aufweist1. Welding sleeve with a sleeve body made of a thermoplastic material, the sleeve body having a reinforcement and with a resistance wire winding arranged on an inner surface, characterized in that the sleeve body (1) has at least one reinforcement layer (6) integrated therewith, which has a layer opposite that Material of the sleeve body (1) has higher rigidity
2. Schweissmuffe nach Anspruch 1, dadurch gekennzeichnet, dass die Verstärkungsschicht (6) an der Aussenfläche (5) des Muffenkörpers (1) angeordnet und durch Stoffschluss mit diesem verbunden ist.2. Welding sleeve according to claim 1, characterized in that the reinforcing layer (6) is arranged on the outer surface (5) of the sleeve body (1) and is connected to it by a material connection.
3. Schweissmuffe nach Anspruch 1, dadurch gekennzeichnet, dass die Verstärkungsschicht (6) innerhalb des Muffenkörpers (1) in dessen äusserem Bereich angeordnet ist und vom thermoplastischen Material des Muffenkörpers (l) umgeben ist. 3. Welding sleeve according to claim 1, characterized in that the reinforcing layer (6) within the sleeve body (1) is arranged in its outer region and is surrounded by the thermoplastic material of the sleeve body (l).
4. Schweissmuffe nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Verstärkungsschicht (6) aus einem gegenüber dem Muffenkörper (1) unterschiedlichen, thermoplastischen Material besteht.4. Welding sleeve according to one of claims 1 to 3, characterized in that the reinforcing layer (6) consists of a different, compared to the sleeve body (1), thermoplastic material.
5. Schweissmuffe nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Verstärkungsschicht (6) aus einem mit Glas- oder Kohlenstoff-Fasern verstärkten thermoplastischen Material besteht.5. Welding sleeve according to one of claims 1 to 3, characterized in that the reinforcing layer (6) consists of a thermoplastic material reinforced with glass or carbon fibers.
6. Schweissmuffe nach Anspruch 3, dadurch gekennzeichnet, dass die Verstärkungsschicht (6) aus einem metallischen, rohrförmigen Teil (7) besteht.6. Welding sleeve according to claim 3, characterized in that the reinforcing layer (6) consists of a metallic, tubular part (7).
7. Verfahren zur Herstellung der Schweissmuffe nach Anspruch 2,dadurch gekennzeichnet, dass der Verstär¬ kungseffekt im thermoplastischen Material durch eine Vernetzungsreaktion erzeugt wird.7. The method for producing the welding sleeve according to claim 2, characterized in that the reinforcing effect in the thermoplastic material is generated by a crosslinking reaction.
8. Verfahren nach Anspruch 7, dadurch gekennzeichnet, dass eineSchicht aus einem für die Vernetzungsreaktion geeigneten, thermoplastischen Material bei der Herstellung des Muffenkörpers durch einen Coextrusionsprozess oder einen Coinjektionsprozess erzeugt wird.8. The method according to claim 7, characterized in that a layer of a thermoplastic material suitable for the crosslinking reaction is produced in the manufacture of the sleeve body by a coextrusion process or a co-injection process.
9. Verfahren zur Herstellung der Schweissmuffe nach Anspruch9. A method for producing the welding sleeve according to claim
3, wobei der Muffenkörper im Spritzverfahren hergestellt ist, dadurch gekennzeichnet, dass bei der Herstellung des Muffenkörpers ein rohrför iges Teil als Verstärkungsschicht in die Spitzform eingelegt wird und mit dem thermoplastischen Material des Muffenteiles umspritzt wird. 3, wherein the sleeve body is produced by spraying, characterized in that a tubular part is inserted as a reinforcing layer in the pointed shape during the manufacture of the sleeve body and is extrusion-coated with the thermoplastic material of the sleeve part.
EP90912857A 1989-09-30 1990-09-13 Welding muff and process for manufacturing it Withdrawn EP0446314A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3932807 1989-09-30
DE3932807A DE3932807C1 (en) 1989-09-30 1989-09-30

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EP (1) EP0446314A1 (en)
JP (1) JPH04501986A (en)
AU (1) AU6279490A (en)
BR (1) BR9006940A (en)
CA (1) CA2042367A1 (en)
CS (1) CS473390A3 (en)
DE (1) DE3932807C1 (en)
FI (1) FI912498A0 (en)
GR (1) GR900100705A (en)
HU (1) HUT58600A (en)
NO (1) NO912066D0 (en)
PL (1) PL287101A1 (en)
PT (1) PT95460A (en)
WO (1) WO1991004845A1 (en)
YU (1) YU172090A (en)

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NL1009169C2 (en) 1998-05-14 1999-11-16 Polva Pipelife Bv Welded sleeve connection for high pressure pipe.
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WO2005105407A1 (en) * 2004-04-28 2005-11-10 Henry Technologies Gmbh Process for producing a high-pressure pipe connection
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CA3040163C (en) 2012-02-17 2021-02-16 Core Linepipe Inc. Pipe electro-fusion assembly
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Also Published As

Publication number Publication date
FI912498A0 (en) 1991-05-23
HUT58600A (en) 1992-03-30
BR9006940A (en) 1991-10-08
JPH04501986A (en) 1992-04-09
YU172090A (en) 1992-09-07
AU6279490A (en) 1991-04-28
HU907689D0 (en) 1991-08-28
NO912066L (en) 1991-05-29
WO1991004845A1 (en) 1991-04-18
PL287101A1 (en) 1991-06-03
GR900100705A (en) 1992-01-20
NO912066D0 (en) 1991-05-29
CS473390A3 (en) 1992-01-15
DE3932807C1 (en) 1991-05-02
CA2042367A1 (en) 1991-03-31
PT95460A (en) 1992-06-30

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