CH683026A5 - Welded coupling sleeve for crosslinked polyethylene@ pipe - has non-crosslinked polyethylene@ inner layer and outer reinforcement - Google Patents

Welded coupling sleeve for crosslinked polyethylene@ pipe - has non-crosslinked polyethylene@ inner layer and outer reinforcement Download PDF

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Publication number
CH683026A5
CH683026A5 CH1807/91A CH180791A CH683026A5 CH 683026 A5 CH683026 A5 CH 683026A5 CH 1807/91 A CH1807/91 A CH 1807/91A CH 180791 A CH180791 A CH 180791A CH 683026 A5 CH683026 A5 CH 683026A5
Authority
CH
Switzerland
Prior art keywords
sleeve
welding
welding sleeve
polyethylene
cross
Prior art date
Application number
CH1807/91A
Other languages
German (de)
Inventor
Kurt Buerli
Original Assignee
Gunzenhauser Ag J & R
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 Gunzenhauser Ag J & R filed Critical Gunzenhauser Ag J & R
Priority to CH1807/91A priority Critical patent/CH683026A5/en
Priority to DE9208024U priority patent/DE9208024U1/en
Publication of CH683026A5 publication Critical patent/CH683026A5/en

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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
    • 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
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/20—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools with direct contact, e.g. using "mirror"
    • 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
    • B29C65/344—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 being a woven or non-woven fabric or being a mesh
    • 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
    • B29C65/3444—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 being a ribbon, band or strip
    • 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
    • B29C65/3444—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 being a ribbon, band or strip
    • B29C65/3452—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 being a ribbon, band or strip forming a sleeve, e.g. a wrap-around sleeve
    • 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
    • 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
    • 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
    • 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
    • B29C66/737—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 state of the material of the parts to be joined
    • B29C66/7375—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 state of the material of the parts to be joined uncured, partially cured or fully cured
    • B29C66/73751—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 state of the material of the parts to be joined uncured, partially cured or fully cured the to-be-joined area of at least one of the parts to be joined being uncured, i.e. non cross-linked, non vulcanized
    • 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
    • B29C66/737—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 state of the material of the parts to be joined
    • B29C66/7375—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 state of the material of the parts to be joined uncured, partially cured or fully cured
    • B29C66/73755—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 state of the material of the parts to be joined uncured, partially cured or fully cured the to-be-joined area of at least one of the parts to be joined being fully cured, i.e. fully cross-linked, fully vulcanized
    • 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
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/24—Pipe joints or couplings

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

Abstract

The welded coupling sleeve for plastics pipes of cross linked polyethylene has an inner layer of non-cross linked polyethylene over at least part of its length. The sleeve has a reinforcement to increase its mechanical strength at the pipe joint. Pref. the coupling has two concentric sleeves (4,5), where the inner sleeve (4) is of non-crosslinked polyethylene, and the outer sleeve (5) is of a cross linked polyethylene. The inner sleeve (4) is divided with their facing ends bent downwards to grip the central ring beading (7) of the outer sleeve (5) between them. The outer sleeve is of a plastics with a higher mechanical resistance than the inner sleeve, or is of a metal such as chrome steel as a shrouding round the inner sleeve, with mating ribs and grooves between them to withstand longitudinal forces on the coupling. USE/ADVANTAGE - The coupling sleeve is for joining plastics pipes, especially in domestic drinking and hot water systems. The sleeve gives an effective sealed joint for the pipes with a long life it is resistant to heat and tension.

Description

1 1

CH 683 026 A5 CH 683 026 A5

2 2nd

Beschreibung description

Es ist bekannt, dass Kunststoffrohre aufgrund ihrer vorteilhaften Betriebseigenschaften, wie Korrosions- und Chemikalienbeständigkeit, leichte Verleg-barkeit, Flexibilität, Lebensdauer, Verschleissfestig-keit, Kalt- und Warmbiegbarkeit, in den letzten Jahren mit grossem Erfolg für Trinkwasser-Hausin-stallationen, Heizwassersysteme und anderes eingesetzt wurden. Zum Verbinden von Rohrabschnitten wurde bisher mit Erfolg das Thermo-Schweiss-verfahren verwendet, das im wesentlichen in zwei Varianten vorliegt. It is known that plastic pipes due to their advantageous operating properties, such as corrosion and chemical resistance, easy to install, flexibility, durability, wear resistance, cold and warm bendability, have been very successful in recent years for domestic drinking water installations, heating water systems and other things were used. So far, the thermal welding process has been used successfully for connecting pipe sections, which is essentially available in two variants.

Einerseits verwendet man hierzu die sogenannte Elektroschweissmuffe, eine aus unvernetztem Polyethylen bestehende, hohlzylindrische Muffe mit im Verbindungsbereich eingebetteter elektrischer Heizspule. Diese Heizspule bringt im erregten Zustand den sie umgebenden Werkstoff zum Schmelzen, der sich ausdehnt und beim Kontakt mit den in die Muffe hineinragenden Rohrenden dieselben ebenfalls oberflächlich zum Schmelzen bringt. Nach dem Erstarren des geschmolzenen Materials sind die beiden Rohre durch die Muffe fest miteinander verbunden. On the one hand, the so-called electro-welding sleeve is used, a hollow cylindrical sleeve made of non-cross-linked polyethylene with an electrical heating coil embedded in the connection area. When excited, this heating coil melts the surrounding material, which expands and, when it comes into contact with the pipe ends projecting into the sleeve, also causes it to melt on the surface. After the molten material has solidified, the two pipes are firmly connected to one another by the sleeve.

Gemäss einer weiteren Variante, dem Heizele-ment-Muffenschweissen, wird die Innenfläche des einen und die Aussenfläche des anderen Rohrendes durch kurzzeitigen Kontakt mit einem entsprechend geformten elektrischen Heizelement bis zur Schmelztemperatur aufgeheizt, worauf die Rohrenden nur noch gegen einen vorgeformten Anschlag ineinandergeschoben werden müssen. According to a further variant, heating element socket welding, the inner surface of one and the outer surface of the other pipe end is heated up to the melting temperature by brief contact with an appropriately shaped electrical heating element, whereupon the pipe ends only have to be pushed into one another against a pre-shaped stop.

Es ist dem Fachmann ferner bekannt, dass Rohre aus vernetztem Polyethylen bisher als grundsätzlich nicht miteinander verschweissbar angesehen wurden, so dass sich die bekannten Schweissver-fahren auf Rohre aus Polybuten, Polypropylen und unvernetztem Polyethylen (PE) beschränkten. Die Nachteile dieser bisher als schweissbar erachteten Kunststoffe sind ebenfalls bekannt: Während das Polybuten aufgrund der Schwundmasse und schwer einhaltbarer Formtoleranzen eine schwierige Verarbeitung bzw. komplizierte Herstellung mit Neigung zur Rissbildung aufweist, benötigt das Polypropylen wegen seiner geringen Festigkeit ausserordentlich dicke Rohrwandungen und das unvernetzte Polyethylen ist nur für Kaltwasser geeignet, Polyvinylchlorid-Rohrverbindungen werden bekanntlich geklebt und werden im Hinblick auf deren Umwelt-Unfreundlichkeit (z.B. die Bildung von Salzsäure beim Verbrennen) nur ungern eingesetzt. It is also known to the person skilled in the art that pipes made of cross-linked polyethylene have hitherto been regarded as fundamentally not weldable with one another, so that the known welding methods are limited to pipes made of polybutene, polypropylene and uncross-linked polyethylene (PE). The disadvantages of these plastics, which were previously considered to be weldable, are also known: While the polybutene, due to the shrinkage and shape tolerances that are difficult to maintain, is difficult to process or complicated to manufacture with a tendency to crack, polypropylene, because of its low strength, requires extremely thick tube walls and is uncrosslinked polyethylene only suitable for cold water, polyvinyl chloride pipe connections are known to be glued and are reluctant to use them due to their environmental unfriendliness (e.g. the formation of hydrochloric acid during combustion).

Demgegenüber stehen die allgemein anerkannten vorteilhaften Eigenschaften des vernetzten Polyethylens, insbesondere dessen hohe Zeitstandfestigkeit, sowie Alterungs- und Temperaturbeständigkeit, dessen Einsatz bisher am Vorurteil der Nicht-Schweissbarkeit scheiterte. This contrasts with the generally recognized advantageous properties of cross-linked polyethylene, in particular its high creep rupture strength, as well as aging and temperature resistance, the use of which has so far failed due to the prejudice of non-weldability.

Es ist ferner eine der Fachwelt bekannte Tatsache, dass nur gleichartige Kunststoffe miteinander verschweisst werden können. Da das sogenannt vernetzte Polyethylen normalerweise immer noch ca. 30% unvernetzte Werkstoffanteile aufweist, wurde bereits versucht, Rohre aus einem derartigen Kunststoff mittels einer Schweissmuffe aus unvernetztem Kunststoff zu verbinden. Dies führt zwar aufgrund des unvernetzten Werkstoffanteils der Rohre zu einer Schweissverbindung, die aber wegen der geringen Dauerfestigkeit des zwangsläufig unvernetzten Muffenwerkstoffs keinen grossen Zug-und Temperaturbelastungen ausgesetzt werden darf. Das Rohrsystem würde somit im Verbindungsbereich eine unverantwortbare Schwachstelle aufweisen, deren mechanische Beanspruchbarkeit und Heisswasserbeständigkeit weit hinter denjenigen der aus vernetztem Polyethylen erstellten Rohre zurückbliebe. It is also a fact known to experts that only plastics of the same type can be welded together. Since the so-called cross-linked polyethylene normally still contains approximately 30% non-cross-linked material, attempts have already been made to connect pipes made from such a plastic by means of a welding sleeve made from uncross-linked plastic. Although this leads to a welded connection due to the non-cross-linked material content of the pipes, this must not be exposed to large tensile and temperature loads due to the low fatigue strength of the inevitably uncross-linked socket material. The pipe system would therefore have an irresponsible weak point in the connection area, the mechanical strength and hot water resistance of which would lag far behind that of the pipes made of cross-linked polyethylene.

Es ist die Aufgabe der vorliegenden Erfindung, eine Schweissmuffe zur Erstellung einer Schweissverbindung an Rohren aus vernetztem Polyethylen vorzuschlagen, wie sie im Oberbegriff des unabhängigen Patentanspruchs 1 beschrieben ist. Dabei soll die neue Schweissmuffe trotz Verwendung des unvernetzten Polyethylens, das sich gegenüber der vernetzten Variante durch geringere mechanische Beanspruchbarkeit auszeichnet, eine einwandfreie Abdichtung mit hoher Druck- und Zugbeanspruch-barkeit aufweisen, so dass die für vernetzte Po-lyethylenrohre bekannte hohe Zeitstandfestigkeit und Temperaturbeständigkeit nun auch für den Verbindungsbereich Geltung haben. It is the object of the present invention to propose a welding sleeve for creating a welded joint on pipes made of cross-linked polyethylene, as described in the preamble of independent claim 1. Despite the use of uncrosslinked polyethylene, which is characterized by lower mechanical strength compared to the crosslinked version, the new welding socket should have a perfect seal with high pressure and tensile strength, so that the high creep rupture strength and temperature resistance known for crosslinked polyethylene pipes are now achieved also apply to the connection area.

Diese Aufgabe wird gelöst durch die im kennzeichnenden Teil des unabhängigen Patentanspruchs 1 definierte Merkmalskombination. This object is achieved by the combination of features defined in the characterizing part of independent patent claim 1.

Nachstehend wird anhand der beiliegenden Zeichnung ein Ausführungsbeispiel nebst mehrerer Varianten beschrieben. Die Fig. 1 bis 5 der beiliegenden Zeichnung sind Schnittdarstellungen verschiedener Ausführungsformen des Erfindungsgegenstandes. An exemplary embodiment and several variants are described below with reference to the accompanying drawing. 1 to 5 of the accompanying drawings are sectional views of various embodiments of the subject matter of the invention.

Fig. 1 zeigt zwei Rohre 1 und 2 aus vernetztem Polyethylen, das hinfort der Einfachheit halber als VPE bezeichnet wird, während das unvernetzte Polyethylen als PE bezeichnet werden soll. Eine in ihrer Gesamtheit mit 3 bezeichnete Schweissmuffe ist zweiteilig aufgebaut: Eine Innenhülse 4 aus PE ist zwischen der Umfangsfläche der beiden Rohrenden und einer aus VPE bestehenden Aussenhülse 5 angeordnet. Die mit Heizdrähten 6 versehene Innenhülse 4 ist in ihrem Mittelbereich geteilt und die Endabschnitte beider Hülsenteile sind so abgewinkelt, dass sie einerseits die Randpartien der Aussenhülse 5, andererseits einen von der Aussenhülse 5 nach innen ragenden, zentralen Ringwulst 7 übergreifen. Fig. 1 shows two pipes 1 and 2 made of cross-linked polyethylene, which for the sake of simplicity is referred to as VPE, while the uncross-linked polyethylene is to be referred to as PE. A welding sleeve, designated as a whole by 3, is constructed in two parts: an inner sleeve 4 made of PE is arranged between the circumferential surface of the two pipe ends and an outer sleeve 5 made of XLPE. The inner sleeve 4 provided with heating wires 6 is divided in its central region and the end sections of both sleeve parts are angled in such a way that they overlap the edge parts of the outer sleeve 5 on the one hand, and a central annular bead 7 which projects inwards from the outer sleeve 5.

Die flüssigkeitsdichte Verbindung der beiden Rohre 1 untò 2 lässt sich erzielen, indem die Schweissmuffe über die Rohrenden geschoben und beheizt wird. Das schmelzende Material der Innenhülse 4 dehnt sich dabei aus und verbindet sich mit den durch Kontakt ebenfalls aufgeheizten Nachbarteilen der Aussenhülse 5 und der Rohrenden. The liquid-tight connection of the two pipes 1 and 2 can be achieved by pushing the welding sleeve over the pipe ends and heating it. The melting material of the inner sleeve 4 expands and connects to the neighboring parts of the outer sleeve 5 and the pipe ends, which are also heated by contact.

Die axiale Gesamtlänge der Schweissmuffe kann den zu erwartenden Längsbeanspruchungen des Rohrsystems angepasst werden. The total axial length of the welding socket can be adapted to the expected longitudinal stresses of the pipe system.

Gemäss Fig. 2 ist über die VPE-Rohre 1 und 2 eine ebenfalls zweiteilige Schweissmuffe 7 geschoben. Diese besteht aus einer Innenhülse 8 aus Polyethylen mit eingebettetem Heizdraht 8a und einer dieselbe allseitig umgebenden Ummantelung 9 aus 2, a likewise two-part welding sleeve 7 is pushed over the XLPE pipes 1 and 2. This consists of an inner sleeve 8 made of polyethylene with embedded heating wire 8a and a sheathing 9 surrounding the same on all sides

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einem mechanisch beanspruchbaren Kunststoff (z.B. POM) oder Metall (z.B. Chromstahl). Je nach Material kann die Innenhülse 8 umspritzt oder das Polyethylen, das die Innenhülse 8 bildet, in die Aussenhülse 9 eingespritzt werden. Die an der Aussenfläche der Innenhülse 8 eingeformten Um-fangsrippen 10 bzw. Ringnuten 11 ermöglichen die Übertragung auch beträchtlicher Druck- und Zugkräfte in Längsrichtung. a mechanically loadable plastic (e.g. POM) or metal (e.g. chrome steel). Depending on the material, the inner sleeve 8 can be extrusion-coated or the polyethylene that forms the inner sleeve 8 can be injected into the outer sleeve 9. The circumferential ribs 10 or annular grooves 11 formed on the outer surface of the inner sleeve 8 also enable the transmission of considerable compressive and tensile forces in the longitudinal direction.

Die in Fig. 3 gezeigte Variante zeigt eine beide VPE Rohre 1 und 2 übergreifende einteilige Schweissmuffe 12 aus Polyethelyen, in welche ein Armierungsnetz 13 aus Stahldraht eingebettet ist. Anstelle des letzteren liesse sich beispielsweise auch ein perforiertes Stahlrohr einbetten. Der Heizdraht ist hier weggelassen, da das System auch für Muffenschweissung geeignet ist, bei welcher die Muffeninnen- und Rohraussenflächen mittels eines Heizwerkzeugs aufgeheizt werden. The variant shown in FIG. 3 shows a one-piece welding sleeve 12 made of polyethylene that spans both XLPE tubes 1 and 2 and in which a reinforcing mesh 13 made of steel wire is embedded. Instead of the latter, for example, a perforated steel tube could also be embedded. The heating wire is omitted here, since the system is also suitable for socket welding, in which the inside and outside of the pipe surfaces are heated using a heating tool.

Auch die in Fig. 4 dargestellte Ausführungsform zeigt eine einteilige Schweissmuffe aus Polyethylen. Die Vernetzung dieses Materials nimmt hier jedoch vom Aussenbereich A nach innen ab, so dass der mit den VPE-Rohren 1 und 2 zu verschweissende Innenbereich I der Schweissmuffe 14 keine Vernetzung mehr aufweist. Auch auf diese Weise wird das angestrebte Ziel erreicht, eine gut verschweiss-bare und dennoch mechanisch und thermisch beanspruchbare Schweissmuffe zu erhalten, wobei hier der vernetzte Aussenbereich A der Schweissmuffe als Armierung dient und die auftretenden Zug- und Druckkräfte durch diesen Aussenbereich übertragen werden. The embodiment shown in FIG. 4 also shows a one-piece welding sleeve made of polyethylene. However, the cross-linking of this material decreases from the outside area A to the inside, so that the inside area I of the welding sleeve 14 to be welded with the XLPE pipes 1 and 2 no longer has any cross-linking. In this way, too, the desired goal is achieved of obtaining a weldable butt weldable but nevertheless mechanically and thermally stressable, wherein the networked outer area A of the welded sleeve serves as reinforcement and the tensile and compressive forces that occur are transmitted through this outer area.

Die Variante nach Fig. 5 zeigt eine Schweissmuffe 15 aus VPE mit zwei eingeformten Hohlräumen 16 und 17, die im Querschnitt T-förmig ausgebildet sind und demgemäss je einen ringförmigen Ver-schweissungsabschnitt V und einen radialen Kanal K aufweisen. Nachdem die Schweissmuffe auf die VPE-Rohre 1 und 2 aufgesteckt wurde, wird in die Hohlräume 16 und 17 über die Kanäle K unter Druck Polyethylen eingespritzt. Das flüssige Material soll die die Hohlräume 16 und 17 umgrenzende Muffenfläche sowie die Rohre anschmelzen und verschweissen. The variant according to FIG. 5 shows a welding sleeve 15 made of XLPE with two molded-in cavities 16 and 17, which are T-shaped in cross section and accordingly each have an annular welding section V and a radial channel K. After the welding sleeve has been placed on the XLPE pipes 1 and 2, polyethylene is injected into the cavities 16 and 17 via the channels K under pressure. The liquid material is intended to melt and weld the sleeve surface delimiting the cavities 16 and 17 and the pipes.

Claims (12)

PatentansprücheClaims 1. Schweissmuffe zur unlösbaren Verbindung zweier aus vernetztem Polyethylen bestehender Rohre, wobei dieselbe einen Innendurchmesser aufweist, welcher gleich oder grösser als der Aussen-durchmesser der zu verbindenden Rohrenden ist und im Hinblick auf die beabsichtigte Verschweis-sung mindestens an ihrer zu verschweissenden Innenseite, und zwar mindestens auf einem Teilbereich ihrer Gesamtlänge, eine Schicht aus unvernetztem Polyethylen aufweist, dadurch gekennzeichnet, dass dieselbe mit einer Armierung versehen ist, welche die im Muffenbereich auftretenden mechanischen Beanspruchungen übernimmt.1.Welding sleeve for the inseparable connection of two pipes made of cross-linked polyethylene, the same having an inside diameter which is equal to or larger than the outside diameter of the pipe ends to be connected and with regard to the intended welding, at least on the inside to be welded, and at least over a portion of its total length, has a layer of uncrosslinked polyethylene, characterized in that it is provided with a reinforcement which takes over the mechanical stresses occurring in the socket area. 2. Schweissmuffe nach Anspruch 1, dadurch gekennzeichnet, dass dieselbe aus zwei konzentrischen Hülsen (4, 5) besteht, deren innere (4) aus unvernetztem Polyethylen erstellt ist (Fig. 1 und 2).2. Welding sleeve according to claim 1, characterized in that it consists of two concentric sleeves (4, 5), the inner (4) of which is made of uncrosslinked polyethylene (Fig. 1 and 2). 3. Schweissmuffe nach Anspruch 2, dadurch gekennzeichnet, dass die äussere (5) der beiden konzentrischen Hülsen (4, 5) aus vernetztem Polyethylen besteht (Fig. 1).3. Welding sleeve according to claim 2, characterized in that the outer (5) of the two concentric sleeves (4, 5) consists of cross-linked polyethylene (Fig. 1). 4. Schweissmuffe nach Anspruch 3, dadurch gekennzeichnet, dass die innere (4) der beiden konzentrischen Hülsen geteilt ist und deren beide Teile mit ihren abgewinkelten Endabschnitten sowohl die Randpartien als auch einen nach innen ragenden zentralen Ringwulst (7) der äusseren Hülse (5) umgreifen (Fig. 1).4. welding sleeve according to claim 3, characterized in that the inner (4) of the two concentric sleeves is divided and the two parts with their angled end portions both the edge parts and an inwardly projecting central annular bead (7) of the outer sleeve (5) reach around (Fig. 1). 5. Schweissmuffe nach Anspruch 2, dadurch gekennzeichnet, dass die äussere Hülse (9) aus einem mechanisch höher beanspruchbaren Kunststoff als die innere Hülse (8) oder einem entsprechenden Metall, z.B. Chromstahl, besteht und die innere Hülse (8) in Form einer Ummantelung übergreift (Fig. 2).5. Welding sleeve according to claim 2, characterized in that the outer sleeve (9) made of a mechanically stronger plastic than the inner sleeve (8) or a corresponding metal, e.g. Chrome steel, and overlaps the inner sleeve (8) in the form of a casing (Fig. 2). 6. Schweissmuffe nach Anspruch 5, dadurch gekennzeichnet, dass im Verbindungsbereich zwischen der inneren (8) und der äusseren Hülse (9) peripherische Rippen bzw. Nuten (10, 11) zur besseren Übertragung auftretender Längskräfte eingeformt sind (Fig. 2).6. Welding sleeve according to claim 5, characterized in that in the connection area between the inner (8) and the outer sleeve (9) peripheral ribs or grooves (10, 11) are formed for better transmission of occurring longitudinal forces (Fig. 2). 7. Schweissmuffe nach Anspruch 1, dadurch gekennzeichnet, dass dieselbe (12) einteilig aus unvernetztem Polyethylen hergestellt und mit einem in dieselbe eingebetteten Armierungsnetz (13) oder einem perforierten Metallrohr versehen ist (Fig. 3).7. welding sleeve according to claim 1, characterized in that the same (12) made in one piece from non-cross-linked polyethylene and is provided with a reinforcing mesh (13) embedded in the same or a perforated metal tube (FIG. 3). 8. Schweissmuffe nach Anspruch 1, dadurch gekennzeichnet, dass dieselbe (14) einteilig aus Polyethylen hergestellt ist, dessen Vernetzung von der Aussenseite (A) der Schweissmuffe nach innen abnimmt, so dass der den zu verbindenden Rohrenden zugewandte Muffenwerkstoff (I) keine Vernetzung mehr aufweist (Fig. 4).8. Welding sleeve according to claim 1, characterized in that the same (14) is made in one piece from polyethylene, the cross-linking of which decreases from the outside (A) of the welding sleeve to the inside, so that the sleeve material (I) facing the pipe ends to be connected no longer cross-links has (Fig. 4). 9. Schweissmuffe nach Anspruch 1, dadurch gekennzeichnet, dass dieselbe in ihrem aus vernetztem Polyethylen bestehenden Grundkörper Hohlräume (16, 17) aufweist, die sich auf der Innenseite der Schweissmuffe (15) erweitern und mit nach aussen geführten Kanälen (K) zum Einspritzen flüssigen, unvernetzten Polyethylens versehen sind (Fig. 5).9. welding sleeve according to claim 1, characterized in that it has in its base made of cross-linked polyethylene cavities (16, 17) which expand on the inside of the welding sleeve (15) and with outwardly directed channels (K) for injection liquid , uncrosslinked polyethylene are provided (Fig. 5). 10. Schweissmuffe nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass in dem aus unvernetztem Polyethylen bestehenden Teil derselben eine elektrische Heizspule eingebettet ist.10. Welding sleeve according to one of claims 1 to 9, characterized in that an electrical heating coil is embedded in the part thereof consisting of uncrosslinked polyethylene. 11. Schweissmuffe nach Anspruch 7, dadurch gekennzeichnet, dass das Armierungsnetz bzw. Metallrohr als elektrisches Heizelement dient.11. Welding sleeve according to claim 7, characterized in that the reinforcing mesh or metal tube serves as an electrical heating element. 12. Venwendung der Schweissmuffe nach Anspruch 7 zum Verschweissen von Rohren aus vernetztem Polyethylen, dadurch gekennzeichnet, dass für die Aufheizung des Armierungsnetzes oder des perforierten Metallrohrs ein auf die Schweissmuffe aufschiebbares Heizgerät verwendet wird.12. Use of the welding sleeve according to claim 7 for welding pipes made of cross-linked polyethylene, characterized in that a heater that can be pushed onto the welding sleeve is used for heating the reinforcing mesh or the perforated metal pipe. 55 1010th 1515 2020th 2525th 3030th 3535 4040 4545 5050 5555 6060 6565 33rd
CH1807/91A 1991-06-18 1991-06-18 Welded coupling sleeve for crosslinked polyethylene@ pipe - has non-crosslinked polyethylene@ inner layer and outer reinforcement CH683026A5 (en)

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CH1807/91A CH683026A5 (en) 1991-06-18 1991-06-18 Welded coupling sleeve for crosslinked polyethylene@ pipe - has non-crosslinked polyethylene@ inner layer and outer reinforcement
DE9208024U DE9208024U1 (en) 1991-06-18 1992-06-15 Welding sleeve for plastic pipes

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EP0882927A1 (en) * 1997-05-09 1998-12-09 Nupi S.p.A. A pipe fitting with thermoelectric adhesion
WO2000010796A1 (en) * 1998-08-21 2000-03-02 Uponor Innovation Ab Method of joining plastics pipes and heat fusion fittings therefor
WO2001006168A1 (en) * 1999-07-16 2001-01-25 Atofina Research Reinforced electro-welding sleeve for plastic pipes
JP2018138989A (en) * 2016-12-20 2018-09-06 アクシス アーベー Alignment member and method for aligning sensor board
CN109827019A (en) * 2019-01-16 2019-05-31 浙江大学 A kind of polyethylene fused pipe considering resistance wire wiring area length
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DE4203626C2 (en) * 1992-02-08 1993-11-04 Fischer Georg Rohrleitung WELDING SLEEVE AND METHOD FOR THE PRODUCTION THEREOF
EP0635354A1 (en) * 1993-07-23 1995-01-25 Streng Plastic AG Electrofusion coupler
US5618065A (en) * 1994-07-21 1997-04-08 Hitachi Metals, Ltd. Electric welding pipe joint having a two layer outer member
GB2299047A (en) * 1995-03-21 1996-09-25 Uponor Ltd Manufacture of electrofusion fittings
AU727163B2 (en) * 1996-06-25 2000-12-07 Uponor Innovation Ab Electrofusion fitting
US5916468A (en) * 1996-07-08 1999-06-29 Hitachi Metals Ltd. Electrically weldable pipe joint and production method thereof
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EP0882927A1 (en) * 1997-05-09 1998-12-09 Nupi S.p.A. A pipe fitting with thermoelectric adhesion
US6135508A (en) * 1997-05-09 2000-10-24 Nupi S.P.A. Pipe fitting with thermoelectric adhesion
WO2000010796A1 (en) * 1998-08-21 2000-03-02 Uponor Innovation Ab Method of joining plastics pipes and heat fusion fittings therefor
WO2001006168A1 (en) * 1999-07-16 2001-01-25 Atofina Research Reinforced electro-welding sleeve for plastic pipes
US6406063B1 (en) 1999-07-16 2002-06-18 Fina Research, S.A. Pipe fittings
JP2018138989A (en) * 2016-12-20 2018-09-06 アクシス アーベー Alignment member and method for aligning sensor board
CN109827019A (en) * 2019-01-16 2019-05-31 浙江大学 A kind of polyethylene fused pipe considering resistance wire wiring area length
CN109827019B (en) * 2019-01-16 2020-05-19 浙江大学 Polyethylene electric melting pipe fitting considering resistance wire wiring area length
US20220341528A1 (en) * 2019-09-30 2022-10-27 Sekisui Chemical Co., Ltd. Electrofusion joint

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