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DE3300943A1 - Electrically heatable strip for producing a sleeve connection for thermally-insulated pipelines - Google Patents

Electrically heatable strip for producing a sleeve connection for thermally-insulated pipelines

Info

Publication number
DE3300943A1
DE3300943A1 DE19833300943 DE3300943A DE3300943A1 DE 3300943 A1 DE3300943 A1 DE 3300943A1 DE 19833300943 DE19833300943 DE 19833300943 DE 3300943 A DE3300943 A DE 3300943A DE 3300943 A1 DE3300943 A1 DE 3300943A1
Authority
DE
Germany
Prior art keywords
meander
plastic
resistance wire
tape
plastic tape
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.)
Ceased
Application number
DE19833300943
Other languages
German (de)
Inventor
Albert 3054 Apelern Elbeshausen
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.)
Kabelmetal Electro GmbH
Original Assignee
Kabelmetal Electro 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 Kabelmetal Electro GmbH filed Critical Kabelmetal Electro GmbH
Priority to DE19833300943 priority Critical patent/DE3300943A1/en
Priority to FR8309607A priority patent/FR2535570A1/en
Priority to CH550983A priority patent/CH662874A5/en
Priority to DK489083A priority patent/DK164927C/en
Priority to FI833953A priority patent/FI833953A/en
Priority to SE8400130A priority patent/SE460683B/en
Priority to NL8400110A priority patent/NL8400110A/en
Publication of DE3300943A1 publication Critical patent/DE3300943A1/en
Ceased 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
    • B29C65/3428—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 said at least a single wire having a waveform, e.g. a sinusoidal form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/4805—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the type of adhesives
    • B29C65/481—Non-reactive adhesives, e.g. physically hardening adhesives
    • B29C65/4815—Hot melt adhesives, e.g. thermoplastic adhesives
    • 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
    • B29C66/723—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 being multi-layered
    • 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
    • F16L59/00—Thermal insulation in general
    • F16L59/14—Arrangements for the insulation of pipes or pipe systems
    • F16L59/16—Arrangements specially adapted to local requirements at flanges, junctions, valves or the like
    • F16L59/18—Arrangements specially adapted to local requirements at flanges, junctions, valves or the like adapted for joints
    • F16L59/20—Arrangements specially adapted to local requirements at flanges, junctions, valves or the like adapted for joints for non-disconnectable joints
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/40—Heating elements having the shape of rods or tubes
    • H05B3/54—Heating elements having the shape of rods or tubes flexible
    • H05B3/56—Heating cables
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/40—Heating elements having the shape of rods or tubes
    • H05B3/54—Heating elements having the shape of rods or tubes flexible
    • H05B3/56—Heating cables
    • H05B3/565—Heating cables flat cables
    • 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
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/50—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like
    • B29C65/5057—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like positioned between the surfaces 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
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/432—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms
    • B29C66/4322—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms by joining a single sheet to itself
    • 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
    • B29C66/53—Joining single elements to tubular articles, hollow articles or bars
    • B29C66/532—Joining single elements to the wall of tubular articles, hollow articles or bars
    • B29C66/5326—Joining single elements to the wall of tubular articles, hollow articles or bars said single elements being substantially flat
    • 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
    • B29C66/72—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
    • B29C66/727—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 being porous, e.g. foam
    • 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
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • 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
    • B29L2023/00—Tubular articles
    • B29L2023/22—Tubes or pipes, i.e. rigid
    • B29L2023/225—Insulated
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/002—Heaters using a particular layout for the resistive material or resistive elements
    • H05B2203/003—Heaters using a particular layout for the resistive material or resistive elements using serpentine layout

Landscapes

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

Abstract

In a heatable strip for producing a sleeve connection for thermally-insulated pipelines having an outer pipe consisting of plastic, in which the sleeve body consists of a plastic strip formed above the connection point, and the sleeve body is welded both to the outer pipe ends and in the course of its overlapping seam, a resistance wire having a meandering shape is embedded in a plastic strip, the distance between the individual meander walls being kept constant.

Description

Elektrisch beheizbares Band zur Herstellung einer Muffenverbindung fürElectrically heatable tape for making a socket connection for

wärmeisolierte Leitungsrohre Die Erfindung betrifft ein elektrisch beheizbares Band zur Herstellung einer Muffenverbindung für wärmeisolierte Leitungsrohre, die aus einem mediumführenden Innenrohr, einer das Innenrohr umgebenden Wärmeisolationsschicht aus aufgeschäumtem Kunststoff und einem Außenrohr aus Kunststoff bestehen, bei der die von Schaumstoff freien Enden der Innenrohre zweier miteinander zu verbindender Rohrschüsse miteinander verschweißt sind, die Verbindungsstelle durch eine auf den Außenrohrenden aufliegende Muffe abgedeckt und der zwischen der Muffe und dem Innenrohr befindliche Ringraum ausgeschäumt ist, wobei der Muffenkörper aus einem mit Überlappung über die Verbindungsstelle geformten Kunststoffband besteht, welches sowohl mit den Außenrohrenden als auch entlang der Überlappungsnaht verschweißt ist.heat-insulated conduit The invention relates to an electrically heatable tape for producing a socket connection for heat-insulated pipes, that consists of an inner pipe carrying the medium, a thermal insulation layer surrounding the inner pipe made of foamed plastic and an outer tube made of plastic, in which the foam-free ends of the inner tubes of two to be connected to one another Pipe sections are welded together, the connection point by one on the Outer pipe ends covered sleeve and that between the sleeve and the inner pipe located annular space is filled with foam, the sleeve body from one with an overlap There is a plastic tape molded over the junction, which both with is welded to the outer pipe ends as well as along the overlap seam.

Aus dem DE-GM 8204372 ist eine Muffenverbindung bekannt, bei der die Verschweißung des Muffenkörpers mit den Außenrohrenden und die Verschweißung im Überlappungsbereich des Kunststoffbandes mittels eines elektrisch beheizbaren Bandes vorgenommen wird. Das Band besteht aus einem mäanderartig geformten Widerstandsdraht, dessen einzelne Windungen durch ein Klebeband in Lage gehalten sind. Nach einer anderen Ausgestaltung ist das aus dem mäanderartig geformten Widerstandsdraht gebildete Band in die Kantenbereiche des Kunststoffbandes eingetempert.From DE-GM 8204372 a socket connection is known in which the Welding of the socket body with the outer pipe ends and the welding in the Overlap area of the plastic tape by means of an electrically heatable tape is made. The band consists of a meander-like shaped resistance wire, whose individual turns are held in place by an adhesive tape. After a Another embodiment is that formed from the meandering resistance wire The tape is annealed into the edge areas of the plastic tape.

Der Nachteil dieser Lösungen ist darin zu sehen, daß bei der Verbindung größerer Rohre der Durchmesser des Widerstandsdrahtes so hoch gewählt werden muß, daß die Gefahr besteht, daß zwischen den einzelnen Mäanderwindungen eine Verschweißung des Muffenkörpers mit den Außenrohrenden bzw. im Überlappungsbereich das Kunststoffband nicht erzielt wird. Hinzu kommt noch, daß durch das Klebeband Fremdmaterial in die Schweißnaht eingebracht wird, wodurch ebenfalls eine einwandfreie Verschweißung der angrenzenden Schichten miteinander behindert wird. Die Lösung des Eintemperns hat insbesondere für große Rohrdurchmesser den Nachteil, daß das Band aufgrund des großen Drahtdurchmessers unhandlich wird.The disadvantage of these solutions can be seen in the fact that the connection larger tubes the diameter of the resistance wire must be chosen so high, that there is a risk of welding between the individual meander turns of the socket body with the outer pipe ends or the plastic tape in the overlapping area is not achieved. In addition, foreign material in the Weld seam is introduced, which also ensures a perfect weld the adjacent layers are hindered with each other. The solution of tempering has the disadvantage, especially for large pipe diameters, that the tape due to the large wire diameter becomes unwieldy.

Der Erfindung liegt von daher die Aufgabe zugrunde, ein Heizband anzugeben, welches eine einwandfreie, lunkerfreie Verschweißung aufgrund von Widerstandserwärmung ermöglicht.The invention is therefore based on the object of specifying a heating tape, which is a flawless, void-free weld due to resistance heating enables.

Diese Aufgabe wird dadurch gelöst, daß ein mäanderartig geformter Widerstandsdraht in ein Kunststoffband eingebettet ist, wobei der Abstand der einzelnen Mäanderwindungen konstant gehalten ist. Durch die Einbettung des Drahtes in ein Kunststoffband wird erreicht, daß genügend Kunststoffmaterial für das Ausfüllen der auftretenden Hohlräume zwischen den miteinander zu verschweißenden Lagen vorhanden ist. Man erhält auf diese Weise eine Kunststoffschweißverbindung, die sowohl wasser- als auch gasdicht zu bezeichnen ist. Zu einer optimalen Lösung gelangt man, wenn der Querschnitt des Kunststoffbandes mindestens gleich dem Querschnitt einer Mäanderwindung des Drahtes ist. Damit ist sichergestellt, daß Lunker nicht mehr auftreten können. Nach einem weiteren Gedanken der Erfindung sollte die Breite des Kunststoffbandes mindestens gleich der Breite einer Mäanderwindung und die Höhe des Kunststoffbandes mindestens dem Durchmesser des Widerstandsdrahtes entsprechen. Bei dieser Lösung sind alle Mäanderwindungen vollständig im Kunststoffband eingebettet. Nach einer anderen Lösung ist vorgesehen, daß die Breite des Bandes geringer ist als die Breite einer Mäanderwindung und die Höhe des Bandes größer ist als der Durchmesser des Widerstandsdrahtes. Während des Schweißvorganges wird das erweichte Material des Kunststoffbandes aufgrund des aufgebrachten Druckes in die freien Räume zwischen den Mäanderwindungen gepreßt und sorgt so für eine gute Verschweißung der Naht. Als Material für das Kunststoffband sollte das gleiche Material wie für das Außenrohr des wärmeisolierten Leitungsrohres und für den Muffenkörper gewählt werden. Bestehen beispielsweise der Außenmantel und der Muffenkörper aus Polyäthylen, besteht ebenfalls das Kunststoffband aus Polyäthylen.This object is achieved in that a meandering shaped Resistance wire is embedded in a plastic tape, with the spacing of each Meander turns is kept constant. By embedding the wire in a Plastic tape ensures that there is enough plastic material for filling the cavities that occur between the layers to be welded together is. In this way, a plastic welded joint is obtained that is both water- is to be referred to as gas-tight. One arrives at an optimal solution if the cross section of the plastic tape is at least equal to the cross section of a meander turn of the wire is. This ensures that blowholes no longer may occur. According to a further idea of the invention, the width of the Plastic tape at least equal to the width of a meander turn and the height of the plastic tape correspond at least to the diameter of the resistance wire. With this solution, all meander turns are completely embedded in the plastic tape. According to another solution it is provided that the width of the band is smaller than the width of a meander turn and the height of the band is greater than the diameter of the resistance wire. The material is softened during the welding process of the plastic tape due to the applied pressure in the free spaces between pressed against the meander turns and ensures that the seam is welded well. The material used for the plastic tape should be the same as for the outer tube of the heat-insulated pipe and for the socket body. Exist for example, the outer jacket and the sleeve body made of polyethylene, is also made the plastic tape made of polyethylene.

Die Erfindung betrifft weiterhin ein Verfahren zur Herstellung eines Bandes zum Verschweißen einer Muffe mit den Außenrohren eines wärmeisolierten Leitungsrohres. Hierbei wird der mäanderartig geformte Widerstandsdraht in erwärmtem Zustand in das Kunststoffband eingepreßt. In Weiterbildung des erfindungsgemäßen Verfahrens wird zunächst ein Widerstandsdraht mäanderartig gewickelt, auf den Mäander ein Kunststoffband aufgelegt, so daß beide Enden des Mäanders unbedeckt ble#iben, der Widerstandsdraht mittels Stromdurchgang aufgeheizt und das Kunststoffband auf den Mäander aufgepreßt wird, wobei der Mäander in das Kunststoffband eindringt. Dieses Verfahren eignet sich insbesondere zur Herstellung vorkonfektionierter Längen. Da die Außendurchmesser der miteinander zu verbindenden Rohrschüsse sich auf relativ wenige Abmessungen beschränken, bietet sich diese Art der Fertigung gegenüber einer kontinuierlichen Fertigung an.The invention further relates to a method for producing a Tape for welding a sleeve to the outer pipes of a heat-insulated conduit pipe. Here, the meander-like shaped resistance wire is heated in the plastic tape is pressed in. In a further development of the method according to the invention First, a resistance wire is wound in a meander-like manner, and a plastic tape is attached to the meander placed so that both ends of the meander remain uncovered, the resistance wire heated by the passage of current and the plastic tape is pressed onto the meander where the meander penetrates the plastic tape. This method is suitable in particular for the production of pre-assembled lengths. As the outside diameter of the pipe sections to be connected to one another have relatively few dimensions limit, this type of production offers itself over a continuous one Manufacturing.

Vorteilhafterweise wird der Mäander zwischen zwei gleiche Kunststoffbänder gelegt und beide Bänder durch die Erwärmung des Drahtes zu einem Band zusammengeschweißt.The meander is advantageously between two identical plastic strips and both bands are welded together to form a band by heating the wire.

Die Erfindung ist anhand der in den Figuren 1 bis 3 schematisch dargestellten Ausführungsbeispiele näher erläutert.The invention is shown schematically on the basis of FIGS. 1 to 3 Embodiments explained in more detail.

Für die Herstellung einer Muffenverbindung gemäß DE-GM 8204372 wird ein Kunststoffband 1 verwendet, in welches ein mäanderartig geformter Widerstandsdraht 2 eingebettet ist. Nach Figur 1 ist die Breite des Kunststoffbandes 1 gleich der Breite des Mäanders und die Höhe entspricht dem Durchmesser des Widerstandsdrahtes 2.For the production of a socket connection according to DE-GM 8204372 a plastic tape 1 is used, in which a meandering resistance wire 2 is embedded. According to Figure 1, the width of the plastic tape 1 is equal to The width of the meander and the height corresponds to the diameter of the resistance wire 2.

Nach Figur 2 ist die Breite des Kunststoffbandes 1 geringer als die Breite des Mäanders, so daß die Enden 3 des Mäanders seitlich aus dem Kunststoffband 1 herausragen. Damit genügend Kunststoffmaterial für die Schweißnaht vorhanden ist, ist die Höhe des Kunststoffbandes 1 größer als der Durchmesser des Widerstandsdrahtes 2. Während des Schweißvorganges fließt dann das Material des Kunststoffbandes 1 unter Einwirkung des Druckes nach beiden Seiten und füllt den Hohlraum zwischen den Enden 3 vollständig aus.According to Figure 2, the width of the plastic tape 1 is less than that Width of the meander, so that the ends 3 of the meander laterally from the plastic band 1 stick out. So that there is enough plastic material for the weld seam, the height of the plastic tape 1 is greater than the diameter of the resistance wire 2. The material of the plastic strip 1 then flows during the welding process under the action of pressure on both sides and fills the cavity between the ends 3 completely.

Die Herstellung eines Heizbandes gemäß Figur 2 ist anhand der Figur 3 näher erläutert. Auf einem Brett 4 sind zwei Reihen von Stiften 5 mit gleichem Abstand zueinander angebracht. Zwischen die Stiftreihen wird zunächst ein Kunststoffband 1 a eingelegt, dessen Länge so bemessen ist, daß an beiden Seiten der Widerstandsdraht 2 überragt. Nun wird der Widerstandsdraht 1 um die Stifte 5 herumgeführt, so daß sich ein Mäander mit gleichem Abstand der einzelnen Mäanderwindungen zueinander ergibt.The production of a heating tape according to FIG. 2 is based on the figure 3 explained in more detail. On a board 4 are two rows of pins 5 with the same Attached to each other. First, a plastic band is placed between the rows of pins 1 a inserted, the length of which is such that on both sides of the resistance wire 2 towers above. Now the resistance wire 1 is passed around the pins 5 so that a meander with the same distance between the individual meander turns results.

Ein Kunststoffband 1 b, welches exakt dem Kunststoffband 1 a in seinen Abmessungen entspricht, wird auf den Mäander aufgelegt und ein gleichmäßiger Druck (siehe Pfeile) erzeugt. Durch Anlegen einer Spannung an die Enden des Widerstandsdrahtes 1 wird der Draht 1 allmählich erwärmt und dringt dabei in die Bänder 1 a und 1 b ein. Der Schweißvorgang wird solange fortgeführt, bis die Bänder 1 a und 1 b miteinander verschweißt sind. Das fertige Band wird dann von den Stiften 5 abgehoben und kann für die Herstellung einer Schweißverbindung für eine Muffe verwendet werden.A plastic tape 1 b, which exactly the plastic tape 1 a in his Dimensions is placed on the meander and an even pressure (see arrows). By applying voltage to the ends of the resistance wire 1, the wire 1 is gradually heated and penetrates into the bands 1 a and 1 b a. The welding process is continued until the bands 1 a and 1 b with each other welded are. The finished tape is then lifted off the pins 5 and can be used to make a weld joint for a socket.

Will man kürzere Heizbänder herstellen, beispielsweise für die Muffenverbindung von Rohren mit kleinerem Durchmesser, werden die Stifte 5 nur über eine bestimmte Länge ausgenutzt.If you want to make shorter heating bands, for example for the socket connection of tubes with a smaller diameter, the pins 5 are only about a certain Length used.

Durch den Abstand der Stifte 5 zueinander ist der Abstand der einzelnen Mäanderwindungen voneinander definiert. Zweckmäßigerweise beträgt der Abstand der einzelnen Mäanderwindungen des Heizbandes in Abhängigkeit vom Durchmesser des Widerstandsdrahtes 1 zwischen 3 und 8 mm.The distance between the pins 5 is the distance between the individual Meander turns defined from one another. The distance is expediently the individual meander turns of the heating tape depending on the diameter of the resistance wire 1 between 3 and 8 mm.

Die Breite der Mäanderwindungen beträgt vorteilhafterweise in Abhängigkeit vom Durchmesser des Widerstandsdrahtes 1 zwischen 20 und 60 mm.The width of the meander turns is advantageously dependent the diameter of the resistance wire 1 between 20 and 60 mm.

Das Heizband gemäß der Lehre der Erfindung läßt sich leicht handhaben, d. h. leicht transportieren und um das Außenrohr herumlegen, wobei sichergestellt ist, daß sich der Abstand der einzelnen Mäanderwindungen nicht verändert.The heating tape according to the teaching of the invention is easy to handle, d. H. Easily transport and wrap around the outer tube, being assured is that the distance between the individual meander turns does not change.

Claims (8)

Patentansprüche 1. Elektrisch beheizbares Band zur Herstellung einer Muffenverbindung für wärmeisolierte Leitungsrohre, die aus einem mediumführenden Innenrohr,- einer das Innenrohr umgebenden Wärmeisolationsschicht aus aufgeschäumtem Kunststoff und einem Außenrohr aus Kunststoff bestehen, bei der die von Schaumstoff freien Enden der Innenrohre zweier miteinander zu verbindender Rohrschüsse miteinander verschweißt sind, die Verbindungsstelle durch eine auf den Außenrohrenden aufliegende Muffe abgedeckt und der zwischen der Muffe und dem Innenrohr befindliche Ringraum ausgeschäumt ist, wobei der Muffenkörper aus einem mit Überlappung über die Verbindungsstelle geformten Kunststoffband besteht, welches sowohl mit den Außenrohrenden als auch entlang der Überlappungsnaht verschweißt ist, dadurch gekennzeichnet, daß ein mäanderartig geformter Widerstandsdraht (2) in ein Kunststoffband (1, 1 a, 1 b) eingebettet ist, wobei der Abstand der einzelnen Mäanderwindungen konstant gehalten ist.Claims 1. Electrically heatable belt for producing a Socket connection for heat-insulated line pipes, which consist of a medium-carrying Inner pipe, - a thermal insulation layer made of foamed material surrounding the inner pipe Plastic and an outer tube made of plastic, in which the foam free ends of the inner pipes of two pipe sections to be connected to one another are welded, the connection point by a resting on the outer pipe ends Sleeve covered and the annular space located between the sleeve and the inner pipe is foamed, the sleeve body from one with an overlap over the connection point molded plastic tape consists, which both with the outer pipe ends and is welded along the overlap seam, characterized in that a meandering resistance wire (2) in a plastic band (1, 1 a, 1 b) is embedded, the distance between the individual meander turns being kept constant is. 2. Elektrisch beheizbares Band nach Anspruch 1, dadurch gekennzeichnet, daß der Querschnitt des Kunststoffbandes (1) mindestens gleich dem Querschnitt einer Mäanderwindung des Drahtes (2) ist.2. Electrically heatable belt according to claim 1, characterized in that that the cross section of the plastic tape (1) is at least equal to the cross section of a Meander winding of the wire (2) is. 3. Elektrisch beheizbares Band nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Breite des Kunststoffbandes (1) mindestens gleich der Breite einer Mäanderwindung und die Höhe des Kunststoffbandes (1) mindestens dem Durchmesser des Widerstandsdrahtes (2) entspricht.3. Electrically heatable belt according to claim 1 or 2, characterized in that that the width of the plastic strip (1) is at least equal to the width of a meander turn and the height of the plastic strip (1) is at least the diameter of the resistance wire (2) corresponds. 4. Elektrisch beheizbares Band nach Anspruch 1 oder einem der folgenden, dadurch gekennzeichnet, daß die Breite des Bandes (1) geringer ist als die Breite einer Mäanderwindung und die Höhe des Bandes (1) größer ist als der Durchmesser des Widerstandsdrahtes (2).4. Electrically heatable belt according to claim 1 or one of the following, characterized in that the width of the band (1) is less than the width a meander turn and the height of the band (1) is greater than the diameter of the resistance wire (2). 5. Elektrisch beheizbares Band nach Anspruch 1 oder einem der folgenden für ein Rohr mit einem Außenmantel aus Polyäthylen, dadurch gekennzeichnet, daß auch das Kunststoffband (1) aus Polyäthylen besteht.5. Electrically heatable belt according to claim 1 or one of the following for a pipe with an outer jacket made of polyethylene, characterized in that also the plastic tape (1) is made of polyethylene. 6. Verfahren zur Herstellung eines Bandes nach Anspruch 1 oder einem der folgenden, dadurch gekennzeichnet, daß der mäanderartig geformte Widerstandsdraht in erwärmtem Zustand in das Kunststoffband eingepreßt wird.6. A method for producing a tape according to claim 1 or one the following, characterized in that the meander-like shaped resistance wire is pressed into the plastic tape in a heated state. 7. Verfahren nach Anspruch 6, dadurch gekennzeichnet, daß zunächst ein Widerstandsdraht mäanderartig gewickelt wird, daß auf den Mäander ein Kunststoffband aufgelegt wird, so daß beide Enden des Mäanders unbedeckt bleiben, daß der Widerstandsdraht mittels Stromdurchgang aufgeheizt und das Kunststoffband auf den Mäander aufgepreßt wird, wobei der Mäander in das Kunststoffband eindringt.7. The method according to claim 6, characterized in that first a resistance wire is wound like a meander that a plastic tape on the meander is placed so that both ends of the meander remain uncovered that the resistance wire heated by the passage of current and the plastic tape is pressed onto the meander where the meander penetrates the plastic tape. 8. Verfahren nach Anspruch 6 oder 7, dadurch gekennzeichnet, daß der Mäander zwischen zwei gleiche Kunststoffbänder gelegt wird und beide Bänder durch die Erwärmung des Drahtes zu einem Band zusammenschweissen.8. The method according to claim 6 or 7, characterized in that the Meander is placed between two identical plastic straps and both straps through The heating of the wire is welded together to form a band.
DE19833300943 1982-10-29 1983-01-13 Electrically heatable strip for producing a sleeve connection for thermally-insulated pipelines Ceased DE3300943A1 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
DE19833300943 DE3300943A1 (en) 1983-01-13 1983-01-13 Electrically heatable strip for producing a sleeve connection for thermally-insulated pipelines
FR8309607A FR2535570A1 (en) 1982-10-29 1983-06-09 Electrical heating strip for producing a sleeve junction for thermally insulated tubular piping, and its method of manufacture.
CH550983A CH662874A5 (en) 1982-10-29 1983-10-10 ELECTRICALLY HEATABLE TAPE FOR PRODUCING A SLEEVE CONNECTION FOR HEAT-INSULATED PIPES AND METHOD FOR PRODUCING SUCH A TAPE.
DK489083A DK164927C (en) 1982-10-29 1983-10-25 SLEEVE CONNECTION TO HEAT-INSULATED WIRING PIPES
FI833953A FI833953A (en) 1982-10-29 1983-10-28 ELEKTRISKT UPPVAERMBART BAND FOER FRAMSTAELLNING AV EN MUFFOERBINDELSE FOER VAERMEISOLERANDE LEDNIN
SE8400130A SE460683B (en) 1983-01-13 1984-01-12 ELECTRIC HEATABLE BAND FOR PREPARING A MUFFLE BOND FOR HEAT-INSULATED WIRING PIPES AND MAKING THE BAND
NL8400110A NL8400110A (en) 1983-01-13 1984-01-12 ELECTRICALLY HEATABLE BELT FOR MANUFACTURING A SLEEVE CONNECTION FOR HEAT-INSULATED PIPE TUBES.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19833300943 DE3300943A1 (en) 1983-01-13 1983-01-13 Electrically heatable strip for producing a sleeve connection for thermally-insulated pipelines

Publications (1)

Publication Number Publication Date
DE3300943A1 true DE3300943A1 (en) 1984-07-19

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Family Applications (1)

Application Number Title Priority Date Filing Date
DE19833300943 Ceased DE3300943A1 (en) 1982-10-29 1983-01-13 Electrically heatable strip for producing a sleeve connection for thermally-insulated pipelines

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Country Link
DE (1) DE3300943A1 (en)
NL (1) NL8400110A (en)
SE (1) SE460683B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012109796B4 (en) * 2012-10-15 2016-03-03 Gerodur Mpm Kunststoffverarbeitung Gmbh & Co Kg Locating aid for detecting plastic pipes

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1849053U (en) * 1959-09-30 1962-03-29 Siemens Ag ARRANGEMENT FOR CONNECTING THERMOPLASTIC PLASTIC MATERIALS.
CH585367A5 (en) * 1974-12-06 1977-02-28 Meldem Charles Butt-joining exposed ends of lagged pipes - using plastic sleeve including resistances which are heated electrically to shrink sleeve
EP0008912A1 (en) * 1978-09-01 1980-03-19 Ube Industries, Ltd. Heat shrinkable covers
DE8204372U1 (en) * 1982-08-05 kabelmetal electro GmbH, 3000 Hannover Socket connection for heat-insulated pipes
EP0075901A1 (en) * 1981-09-29 1983-04-06 Von Roll Ag Process for providing a mantle tube connection across a joint between heat insulated pipes and pipe section for carrying out said process
EP0098024A1 (en) * 1982-06-29 1984-01-11 i.c. Möller a/s A method of joining prefabricated heat insulated pipes and a welding fitting therefor

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8204372U1 (en) * 1982-08-05 kabelmetal electro GmbH, 3000 Hannover Socket connection for heat-insulated pipes
DE1849053U (en) * 1959-09-30 1962-03-29 Siemens Ag ARRANGEMENT FOR CONNECTING THERMOPLASTIC PLASTIC MATERIALS.
CH585367A5 (en) * 1974-12-06 1977-02-28 Meldem Charles Butt-joining exposed ends of lagged pipes - using plastic sleeve including resistances which are heated electrically to shrink sleeve
EP0008912A1 (en) * 1978-09-01 1980-03-19 Ube Industries, Ltd. Heat shrinkable covers
EP0075901A1 (en) * 1981-09-29 1983-04-06 Von Roll Ag Process for providing a mantle tube connection across a joint between heat insulated pipes and pipe section for carrying out said process
EP0098024A1 (en) * 1982-06-29 1984-01-11 i.c. Möller a/s A method of joining prefabricated heat insulated pipes and a welding fitting therefor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012109796B4 (en) * 2012-10-15 2016-03-03 Gerodur Mpm Kunststoffverarbeitung Gmbh & Co Kg Locating aid for detecting plastic pipes

Also Published As

Publication number Publication date
SE8400130L (en) 1984-07-14
SE460683B (en) 1989-11-06
SE8400130D0 (en) 1984-01-12
NL8400110A (en) 1984-08-01

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