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DE4025840A1 - Joining polyolefin pipe to connector - by cold expanding end of pipe with inner dia., smaller than outer dia. of connector fitting over connector, etc. - Google Patents

Joining polyolefin pipe to connector - by cold expanding end of pipe with inner dia., smaller than outer dia. of connector fitting over connector, etc.

Info

Publication number
DE4025840A1
DE4025840A1 DE4025840A DE4025840A DE4025840A1 DE 4025840 A1 DE4025840 A1 DE 4025840A1 DE 4025840 A DE4025840 A DE 4025840A DE 4025840 A DE4025840 A DE 4025840A DE 4025840 A1 DE4025840 A1 DE 4025840A1
Authority
DE
Germany
Prior art keywords
pipe
connector
expanded
connecting part
clamping ring
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.)
Granted
Application number
DE4025840A
Other languages
German (de)
Other versions
DE4025840C2 (en
DE4025840C3 (en
Inventor
Friedel Imgram
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.)
Uponor Innovation AB
Original Assignee
WIRSBO PEX 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 WIRSBO PEX GmbH filed Critical WIRSBO PEX GmbH
Priority to DE4025840A priority Critical patent/DE4025840C3/en
Publication of DE4025840A1 publication Critical patent/DE4025840A1/en
Publication of DE4025840C2 publication Critical patent/DE4025840C2/en
Application granted granted Critical
Publication of DE4025840C3 publication Critical patent/DE4025840C3/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/66—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by liberation of internal stresses, e.g. shrinking of one 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
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5221—Joining tubular articles for forming coaxial connections, i.e. the tubular articles to be joined forming a zero angle relative to each other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—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
    • 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
    • F16L47/20—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics based principally on specific properties of plastics
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)

Abstract

Pipes are joined in a process in which one end of a polyolefin pipe is expanded and fitted over a connecting piece. The end, whose i.d. is smaller than the o.d. of the connector, is reversibly expanded at room temp. by means of a spreader mandrel to an i.d. greater than the o.d. of the connector; the spreader is removed and the pipe and connector are fitted together, after which the connector is attached formly to the pipe by reversing the expansion. Medium density and crosslinked polyolefins in partic. are cold formed and they tend to revert to their original shape. The expanded pipe therefore shrinks back again. It does so relatively quickly. Moreover the shrinkage causes the polymer to adapt itself to such features as beads, dimples, grooves etc.. Clamping ring of such reversibly formed polymer can also be fitted over the end of the pipe in the same way. Equally an e.g. metal clamping ring is used conventionally. ADVANTAGE - Produces tight joints at room temp..

Description

Die Erfindung betrifft ein Verfahren zur Herstellung einer Rohrleitungsverbindung, bei dem ein Rohrende eines Rohres aus Polyolefin aufgeweitet und auf ein Anschlußteil auf­ gespannt wird.The invention relates to a method for producing a Pipe connection, in which a pipe end of a pipe expanded from polyolefin and onto a connector is excited.

Bei einem bekannten Verfahren dieser Art, das in der DE-OS 38 17 442.1 beschrieben ist, wird eine solche Rohr­ leitungsverbindung beschrieben, die beispielsweise durch eine Schrumpfmuffe hergestellt wird, welche die Anschluß­ teile zweier Rohre überbrückt. Die Schrumpfmuffe kann beispielsweise aus einem thermoplastischen Material wie vernetztem Polyolefin bestehen. Sie wird dadurch mit den Anschlußteilen verbunden, daß das vernetzte Polyolefin nach dem Erwärmen über den Kristallitschmelzpunkt hinaus im erwärmten Zustand verformbar ist und in diesem er­ wärmten Zustand unter Aufweitung auf die Anschlußteile aufgeschoben werden kann. In gleicher Weise kann auch das Rohrende eines Rohres aus vernetztem Polyolefin auf ein Anschlußteil, zum Beispiel T-Stück aufgeschoben werden.In a known method of this type, which in the DE-OS 38 17 442.1 is described, such a tube line connection described, for example, by a shrink sleeve is produced, which is the connection parts of two pipes bridged. The shrink sleeve can for example from a thermoplastic material such as cross-linked polyolefin. It will be with the Connected parts that the crosslinked polyolefin after heating above the crystallite melting point is deformable in the heated state and in this he warmed condition while expanding to the connector parts can be postponed. In the same way it can Tube end of a cross-linked polyolefin tube on Connection part, for example T-piece, can be pushed on.

Die Durchführung dieses Verfahrens bringt in der Praxis gewisse Schwierigkeiten mit sich, weil das vernetzte Poly­ olefin auf relativ hohe Temperaturen, zum Beispiel ober­ halb von 135°C im Falle von vernetztem Polyethylen er­ wärmt werden muß und nur bei dieser Temperatur eine aus­ reichend leichte Verformbarkeit besitzt. Es kommt daher darauf an, die betreffenden Teile in so kurzer Zeit mit­ einander zu verbinden, daß während dieser Zeit noch keine Abkühlung unter den Kristallitschmelzpunkt erfolgt.The implementation of this procedure brings in practice certain difficulties with it because the networked poly  olefin to relatively high temperatures, for example above half of 135 ° C in the case of cross-linked polyethylene must be warmed and only at this temperature has sufficient easy deformability. It comes from that insists on having the parts in question in such a short time to connect one another that during this time none Cooling takes place below the crystallite melting point.

Die Aufgabe der Erfindung besteht darin, ein Verfahren zur Herstellung einer Rohrleitungsverbindung der eingangs genannten Art zu schaffen, das die Herstellung einer sicheren Rohrleitungsverbindung unter normalen, d. h. Umgebungstemperaturen gestattet.The object of the invention is a method to establish a pipeline connection at the beginning to create the kind mentioned that the manufacture of a secure pipeline connection under normal, d. H. Ambient temperatures allowed.

Erfindungsgemäß wird diese Aufgabe dadurch gelöst, daß das Ende des Rohres, dessen Innendurchmesser kleiner ist als der Außendurchmesser des Anschlußteiles, mit Hilfe eines Spreizdorns bei Umgebungstemperatur reversibel auf einen Innendurchmesser aufgeweitet wird, der größer als der Außendurchmesser des Anschlußteiles ist, und daß nach Entfernung des Spreizdorns das noch aufgeweitete Ende des Rohres und das Anschlußteil aufeinandergesteckt werden, wobei das Anschlußteil durch Rückverformung des rever­ sibel aufgeweiteten Rohrendes fest und abdichtend mit dem Rohrende verbunden wird.According to the invention, this object is achieved in that the end of the tube, the inside diameter of which is smaller than the outside diameter of the connector, with the help of an expanding mandrel reversibly at ambient temperature an inner diameter that is larger than the outer diameter of the connector is, and that after Removal of the expanding mandrel the still widened end of the Tube and the connector are put together, wherein the connector by reshaping the rever sibel widened pipe end firmly and sealing with the Tube end is connected.

Die Erfindung beruht auf der überraschenden Erkenntnis, daß Polyolefine, insbesondere mitteldichte und vernetzte Polyolefine, auch im kalten und teilweise kristallinen Zustand, d. h. im nicht über den Kristallitschmelzpunkt hinaus erwärmten Zustand eine hinreichend weitgehende, reversible Verformbarkeit besitzen. Das bedeutet, daß das Polyolefin unter mechanischer Einwirkung verformbar ist, aber im verformten Zustand bestrebt ist, die ursprüngliche Form wieder anzunehmen. Bei Aufbringung hinreichend großer Kräfte, zum Beispiel mit Hilfe eines Spreizdorns üblicher Bauart zur Aufweitung von Rohren, ist es daher möglich, Rohrenden von Rohren aus Polyolefin reversibel aufzuweiten. Unter den herrschenden Bedingungen bei Umgebungstemperatur erfolgt die Rückumwandlung in den ursprünglichen Zustand, d. h. auf die ursprüngliche Rohrweite mit relativ geringer Geschwindigkeit, so daß der Spreizdorn aus dem aufge­ weiteten Rohr entnommen und das noch aufgeweitete Rohr­ ende auf das jeweils gewünschte Anschlußteil aufgesteckt werden kann. Andererseits ist die Rückumwandlungs­ geschwindigkeit so groß, daß keine unnötigen Wartezeiten entstehen.The invention is based on the surprising finding that polyolefins, especially medium density and crosslinked Polyolefins, also in cold and partly crystalline Condition, d. H. im not over the crystallite melting point warmed up condition a sufficiently extensive, possess reversible deformability. That means that Polyolefin is deformable under mechanical influence, but strives in the deformed state, the original To take shape again. When applied sufficiently large Forces more common, for example, using an expanding mandrel  Design for expanding pipes, it is therefore possible Expandable pipe ends of polyolefin pipes. Under the prevailing conditions at ambient temperature the conversion back to the original state takes place, d. H. to the original pipe size with a relatively small Speed so that the expanding mandrel from the up removed the expanded tube and the expanded tube plugged onto the desired connector can be. On the other hand, the back conversion speed so great that no unnecessary waiting times arise.

Im Vergleich zu anderen Materialien haben Polyolefine den Vorteil, daß die Aufweitung, soweit sie nach dem Ver­ binden mit dem Anschlußteil bestehen bleibt, nicht zur Bildung von Spannungsrissen führt.Compared to other materials have polyolefins the advantage that the expansion, insofar as it is after Ver bind with the connector remains, not for Formation of stress cracks leads.

Das erfindungsgemäße Verfahren bietet daher eine beson­ ders vorteilhafte Möglichkeit, Rohre aus Polyolefin ohne Aufwendung von Wärmeenergie mit dem jeweils gewünschten Rohranschlußteil zu verbinden. Dabei wird durch die Rück­ umformung des aufgeweiteten Rohrendes eine besonders feste und abdichtende, insbesondere gasdichte Verbindung er­ halten. Bei dieser Rückumformung paßt sich das Polyolefin gegebenenfalls vorhandenen Oberflächenstrukturen an dem Anschlußteil an. Als solche, die Bindungsfestigkeit er­ höhenden Oberflächenstrukturen kommen beispielsweise Wülste, Sicken, Rillen oder Rändelungen, mit denen das rückver­ formte Polyolefin in Eingriff kommt, infrage.The method according to the invention therefore offers a special feature ders advantageous way to without polyolefin pipes Application of thermal energy with the desired one To connect pipe connection part. This is done by the back Forming the widened pipe end a particularly firm and sealing, in particular gas-tight connection hold. The polyolefin adapts during this reshaping any existing surface structures on the Connecting part. As such, the bond strength he for example, there are ridges, Beads, grooves or knurls with which the reverse molded polyolefin comes into question.

Im Zusammenhang mit dem vorstehend beschriebenen Verfahren ist auch eine weitere Sicherung der hergestellten Rohr­ leitungsverbindung möglich, soweit dies erforderlich ist. Dazu können Rohrschellen bekannter Art dienen. Es ist aber auch möglich, auf das Rohrende des Rohres aus Polyolefin einen Spannring aufzubringen. Dieser Spannring kann, so­ fern er ebenfalls aus einem reversibel verformbaren Material besteht, von Beginn an auf das Rohrende aufgebracht werden. Es ist aber auch möglich, einen nicht oder nur wenig ver­ formbaren Spannring, z. B. aus Metall, nach Herstellung der Rohrleitungsverbindung zum Beispiel mit bekannten hydrau­ lischen Mitteln auf das rohrseitige Ende der Rohrleitungs­ verbindung aufzuschieben.In connection with the method described above is also another backup of the pipe manufactured Line connection possible, if this is necessary. Pipe clips of known type can be used for this. But it is also possible on the pipe end of the polyolefin pipe  to apply a tension ring. This tension ring can, so also made of a reversibly deformable material exists, be applied to the pipe end from the beginning. But it is also possible to not or only a little malleable clamping ring, e.g. B. of metal, after the manufacture of Pipe connection for example with known hydrau means on the pipe-side end of the pipeline postpone connection.

Claims (6)

1. Verfahren zur Herstellung einer Rohrleitungsverbindung, bei dem ein Rohrende eines Rohres aus Polyolefin auf­ geweitet und auf ein Anschlußteil aufgespannt wird, dadurch gekennzeichnet, daß das Ende des Rohres, dessen Innendurchmesser kleiner ist als der Außendurchmesser des Anschlußteiles, mit Hilfe eines Spreizdorns bei Umgebungstemperatur reversibel auf einen Innendurch­ messer aufgeweitet wird, der größer als der Außendurch­ messer des Anschlußteiles ist, und daß nach Entfernung des Spreizdorns das noch aufgeweitete Ende des Rohres und das Anschlußteil aufeinandergesteckt werden, wobei das Anschlußteil durch Rückverformung des reversibel aufgeweiteten Rohrendes fest und abdichtend mit dem Rohrende verbunden wird.1. A method for producing a pipeline connection, in which a pipe end of a polyolefin pipe is expanded and clamped onto a connecting part, characterized in that the end of the pipe, the inner diameter of which is smaller than the outer diameter of the connecting part, with the aid of an expanding mandrel at ambient temperature reversibly expanded to an inner diameter that is larger than the outer diameter of the connecting part, and that after removal of the expanding mandrel, the still widened end of the tube and the connecting part are plugged together, the connecting part by reshaping the reversibly widened tube end firmly and sealingly with the Tube end is connected. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Anschlußteil mit einer Oberflächenstruktur zur Vergrößerung der Eingriffsfläche mit dem Rohrende versehen wird.2. The method according to claim 1, characterized in that that the connector with a surface structure to enlarge the engagement surface with the pipe end is provided. 3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Verbindung zusätzlich durch eine Rohrschelle gesichert wird.3. The method according to claim 1 or 2, characterized in that the connection is additionally through a pipe clamp is secured. 4. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Verbindung durch einen Spannring gesichert wird. 4. The method according to claim 1 or 2, characterized in that the connection is secured by a clamping ring.   5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, daß der Spannring aus einem reversibel verformbaren Material besteht und zusammen mit dem Rohrende rever­ sibel aufgeweitet wird.5. The method according to claim 4, characterized in that the clamping ring from a reversibly deformable Material exists and rever together with the pipe end is expanded sibel. 6. Verfahren nach Anspruch 4, dadurch gekennzeichnet, daß der Spannring aus einem nicht oder nur wenig verformbaren Material besteht und nach Herstellung der Verbindung hydraulisch auf das das Anschlußteil umgebende Rohrende aufgeschoben wird.6. The method according to claim 4, characterized in that the clamping ring from a little or no deformable material and after manufacture of the connection hydraulically on the the connecting part surrounding pipe end is pushed on.
DE4025840A 1990-08-16 1990-08-16 Process for the production of pipeline connections from polyolefin Expired - Lifetime DE4025840C3 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE4025840A DE4025840C3 (en) 1990-08-16 1990-08-16 Process for the production of pipeline connections from polyolefin

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE4025840A DE4025840C3 (en) 1990-08-16 1990-08-16 Process for the production of pipeline connections from polyolefin

Publications (3)

Publication Number Publication Date
DE4025840A1 true DE4025840A1 (en) 1992-02-20
DE4025840C2 DE4025840C2 (en) 1994-03-31
DE4025840C3 DE4025840C3 (en) 1999-06-24

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Family Applications (1)

Application Number Title Priority Date Filing Date
DE4025840A Expired - Lifetime DE4025840C3 (en) 1990-08-16 1990-08-16 Process for the production of pipeline connections from polyolefin

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DE (1) DE4025840C3 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4243625A1 (en) * 1992-12-22 1994-06-23 Wolf Woco & Co Franz J Connector pipe for small bore plastics pipes
WO2009004407A1 (en) * 2007-07-02 2009-01-08 Uponor Innovation Ab Method of forming a clamping ring and a clamping ring
DE202009003109U1 (en) 2009-03-09 2009-05-20 Hpg Heizrohr Produktions Gmbh Socket connection of pipes and hoses made of polyethylene for hot water applications

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20104340U1 (en) * 2001-03-14 2002-07-25 Uponor Innovation Ab, Fristad Plastic pipe
RU2207201C2 (en) * 2001-04-04 2003-06-27 ОАО "Челябинский трубопрокатный завод" Method for hot rolling of tubes of forged blanks and ingots (produced by continuous casting, electric slag refining, vacuum refining) in lines with pilger rolling mills
RU2221656C2 (en) * 2002-02-26 2004-01-20 ОАО "Челябинский трубопрокатный завод" Method for making tubes of hard-to-form kinds of steels and alloys with increased linear expansion factor
RU2220794C2 (en) * 2002-02-26 2004-01-10 ОАО "Челябинский трубопрокатный завод" Method for making conversion tubes of hard-to-form kinds of steels and alloys with increased linear expansion factor

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1909489A1 (en) * 1968-02-27 1969-11-20 Raychem Corp Metal-coated articles made of heat-shrinkable plastics
DE2852495A1 (en) * 1978-12-05 1980-06-19 Karl Heinz Vahlbrauk Metal tube ends joining system - uses metal sheath with grooves in internal surface shrunk onto outside of tubes
DE8015077U1 (en) * 1980-06-06 1980-11-13 Jeschke, Immanuel, 3203 Sarstedt GAS HOUSE CONNECTION DEVICE
DE3608843A1 (en) * 1986-03-17 1987-09-24 Rehau Ag & Co TWO PIECE METAL CLAMP CONNECTOR
DE3817442A1 (en) * 1988-05-21 1989-11-30 Platzer Schwedenbau Gmbh Clamp-free pipeline connection

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1909489A1 (en) * 1968-02-27 1969-11-20 Raychem Corp Metal-coated articles made of heat-shrinkable plastics
DE2852495A1 (en) * 1978-12-05 1980-06-19 Karl Heinz Vahlbrauk Metal tube ends joining system - uses metal sheath with grooves in internal surface shrunk onto outside of tubes
DE8015077U1 (en) * 1980-06-06 1980-11-13 Jeschke, Immanuel, 3203 Sarstedt GAS HOUSE CONNECTION DEVICE
DE3608843A1 (en) * 1986-03-17 1987-09-24 Rehau Ag & Co TWO PIECE METAL CLAMP CONNECTOR
DE3817442A1 (en) * 1988-05-21 1989-11-30 Platzer Schwedenbau Gmbh Clamp-free pipeline connection

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Technische Information der Fa. REHAU & Co, REHAU, Nr. 853601 Müs 8.89 "Rehau-Heitzkörper- Anschlußsystem Schiebehülse *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4243625A1 (en) * 1992-12-22 1994-06-23 Wolf Woco & Co Franz J Connector pipe for small bore plastics pipes
WO2009004407A1 (en) * 2007-07-02 2009-01-08 Uponor Innovation Ab Method of forming a clamping ring and a clamping ring
US8365382B2 (en) 2007-07-02 2013-02-05 Uponor Innovation Ab Method of forming a clamping ring and a clamping ring
DE202009003109U1 (en) 2009-03-09 2009-05-20 Hpg Heizrohr Produktions Gmbh Socket connection of pipes and hoses made of polyethylene for hot water applications

Also Published As

Publication number Publication date
DE4025840C2 (en) 1994-03-31
DE4025840C3 (en) 1999-06-24

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