DE3712356A1 - Thermoplastic band for covering a joint of plastic pipes - Google Patents

Thermoplastic band for covering a joint of plastic pipes

Info

Publication number
DE3712356A1
DE3712356A1 DE19873712356 DE3712356A DE3712356A1 DE 3712356 A1 DE3712356 A1 DE 3712356A1 DE 19873712356 DE19873712356 DE 19873712356 DE 3712356 A DE3712356 A DE 3712356A DE 3712356 A1 DE3712356 A1 DE 3712356A1
Authority
DE
Germany
Prior art keywords
plastic
heating conductor
tape
band
turns
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
DE19873712356
Other languages
German (de)
Inventor
Juergen Dipl Ing Friessner
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 DE19873712356 priority Critical patent/DE3712356A1/en
Priority to DK186488A priority patent/DK186488A/en
Publication of DE3712356A1 publication Critical patent/DE3712356A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D23/00—Producing tubular articles
    • B29D23/001—Pipes; Pipe joints
    • B29D23/003—Pipe joints, e.g. straight joints
    • B29D23/005—Pipe joints, e.g. straight joints provided with electrical wiring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/3404—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the type of heated elements which remain in the joint
    • B29C65/342—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the type of heated elements which remain in the joint comprising at least a single wire, e.g. in the form of a winding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/3472—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the composition of the heated elements which remain in the joint
    • B29C65/3476—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the composition of the heated elements which remain in the joint being metallic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/24—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight
    • B29C66/244—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being non-straight, e.g. forming non-closed contours
    • 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
    • B29C66/40—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
    • B29C66/49—Internally supporting the, e.g. tubular, article during joining
    • B29C66/496—Internally supporting the, e.g. tubular, article during joining using a support which remains in the joined object
    • 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
    • B29C66/72—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
    • 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
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
    • B29C70/82—Forcing wires, nets or the like partially or completely into the surface of an article, e.g. by cutting and pressing
    • 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
    • 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
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

A thermoplastic band (1) for covering a joint of plastic pipes is described, which is laid on the ends of the pipes to be joined, around the joint, with overlapping longitudinal edges and is welded in the region of the overlapping band edges with the ends of the pipes by means of a heating conductor (2). To protect the heating conductor (2) against mechanical damage and corrosion and to simplify the production of the band (1), the heating conductor (2) is laid in at least two loops (3), running almost parallel with respect to each other, in three peripheral regions (4, 5, 6) of the plastic band (1) and is inset into the surface of the plastic band (1). <IMAGE>

Description

Die Erfindung betrifft ein Band aus thermoplastischem Kunststoff zur Abdeckung einer Verbindungsstelle von Rohren aus Kunststoff, wobei das Band auf den Enden der zu verbindenden Rohre aufliegend um die Verbindungsstelle mit überlappenden Längskanten herumgelegt und im Bereich der überlappenden Längskanten und mit den Enden der Rohre mittels eines Heizleiters verschweißt ist, insbesondere zur Abdeckung der Verbindungsstelle von wärmeisolierten Leitungsrohren, welche aus einem mediumführenden lnnenrohr, einer Wärmeisolationsschicht sowie einem Außenrohr aus thermoplastischem Kunststoff bestehen.The invention relates to a tape made of thermoplastic material for Covering a junction of plastic pipes, where the tape resting on the ends of the pipes to be connected around the Connection point with overlapping longitudinal edges laid around and in Area of the overlapping longitudinal edges and with the ends of the pipes is welded by means of a heating conductor, in particular for covering the junction of heat-insulated conduits, which are made of a medium-carrying inner tube, a heat insulation layer and an outer tube made of thermoplastic material.

Aus dem DE-GM 82 04 372 ist eine Muffenverbindung für Fernwärmeleitungen bekannt, bei der die Verbindungsstelle durch ein Kunststoffband abgedeckt ist, welches durch elektrische Heizleiter sowohl an der Auflagefläche auf den Außenrohrenden als auch im Bereich seiner Überlappungsnaht verschweißt ist. Der Heizleiter ist hierbei in den Randbereichen des Kunststoffbandes in Form eines Mäanders verlegt. Die Befestigung des Heizleiters an dem Kunststoffband geschieht bei diesem Kunststoffband entweder durch ein Klebeband oder durch ein Anheften durch Eintempern. Beiden Lösungen ist gemeinsam, daß eine Festlegung des Heizleiters an der Oberfläche des Kunststoffbandes insbesondere beim Herumlegen des Kunststoffbandes um die Verbindungsstelle nicht immer gewährleistet war. Ein weiterer Nachteil besteht darin, daß vor Beginn des Schweißvorgangs die zu verschweißenden Oberflächen durch einen Spalt getrennt waren, welcher zur Folge hatte, daß der Schweißvorgang recht lange dauerte. Die Ursache hierfür ist darin zu sehen, daß die durch den Heizleiter erzeugte Wärme zu Beginn des Schweißvorganges, d. h. bevor der Heizleiter in die Kunststoffoberfläche eingedrückt wurde, durch vorbeiströmende Luft von dem Heizleiter entfernt wurde. Darüber hinaus führte die langsame Erhitzung des Heizleiters an der Luft zu einer unerwünschten Oxidation der Oberfläche des Heizleiters. Außerdem bestand die Möglichkeit, den an der Oberfläche des Kunststoffbandes befindlichen Heizleiter durch mechanische Einwirkungen beim Transport zu beschädigen. Durch die Verlegung des Heizleiters in Form einer Mäanderwindung ist die Fertigungsgeschwindigkeit für die Herstellung eines fertigen mäanderförmig gebogenen Heizleiters recht zeitaufwendig und darüber hinaus ist eine Veränderung der Heizleistung nur durch eine Veränderung des Abstandes zwischen den einzelnen Mäanderwindungen möglich.From DE-GM 82 04 372 is a socket connection for District heating lines known, in which the connection point through a Plastic tape is covered, which is covered by electrical heating conductors both on the contact surface on the outer tube ends and in Area of its lap seam is welded. The heating conductor is here in the edge areas of the plastic band in the form of a  Meandered. Attaching the heating conductor to the With this plastic band, plastic band either happens through a Adhesive tape or by tacking in by tempering. Both solutions is common that a fixing of the heating conductor on the surface the plastic tape especially when laying around the Plastic tape around the junction is not always guaranteed was. Another disadvantage is that before the start of the Welding the surfaces to be welded through a gap were separated, which meant that the welding process was right took a long time The reason for this is that the through the heat conductor generated heat at the beginning of the welding process, d. H. before the heating conductor was pressed into the plastic surface, was removed from the heating conductor by air flowing past. About that in addition, the slow heating of the heat conductor led to air undesirable oxidation of the surface of the heating conductor. In addition, there was the possibility that the surface of the Plastic band located heating conductor by mechanical Damage during transport. By laying the The heating conductor in the form of a meandering turn is the Manufacturing speed for the manufacture of a finished meandering curved heating conductor quite time consuming and above In addition, a change in the heating output is only by one Change in the distance between the individual meandering turns possible.

Der vorliegenden Erfindung liegt die Aufgabe zu Grunde, ein Kunststoffband für den genannten Zweck anzugeben, welches einen schnelleren Schweißprozeß ermöglicht und den Heizleiter sowohl beim Transport der Kunststoffbänder als auch während des Schweißvorganges vor äußeren Einflüssen wie mechanische Beschädigung und Oxidation schützt. Darüber hinaus soll die Herstellung und die Anpassung an unterschiedliche Heizleistungen bei solchen Kunststoffbändern wesentlich vereinfacht werden. The present invention is based on the object Specify plastic tape for the purpose mentioned, which one allows faster welding process and the heat conductor both Transport of the plastic straps as well as during the welding process against external influences such as mechanical damage and oxidation protects. In addition, the manufacture and adaptation to different heating powers with such plastic tapes be significantly simplified.  

Diese Aufgabe wird bei einem Band der eingangs erwähnten Art dadurch gelöst, daß der Heizleiter in mindestens zwei nahezu parallel zueinander verlaufenden Windungen in drei Randbereichen des Kunststoffbandes verlegt und in die Oberfläche des Kunststoffbandes eingelassen ist.This task is achieved with a tape of the type mentioned solved that the heating conductor in at least two almost parallel mutually extending turns in three edge areas of the Plastic tape laid and in the surface of the plastic tape is let in.

Zweckmäßigerweise verlaufen die einzelnen Windungen in einer leichten Sinuskurve, so daß jede Windung beim Aufheizen vor und während des Schweißprozesses die durch die Aufheizung bedingte Längenänderung des Heizleiters kompensieren kann.The individual turns expediently run in a slight Sinus curve, so that each turn when heating up before and during the Welding process the change in length caused by the heating Can compensate the heating conductor.

Nach einer besonders vorteilhaften Ausgestaltung der Erfindung ist vorgesehen, daß die Windungen zu der die Überlappungsnaht bildenden Kante des Bandes parallel und zu den die Umfangsnähte mit den Enden der Rohre bildenden Kanten unter einem Winkel von 1,5 bis 10 Grad verlaufen. Hierbei ist wesentlich, daß die Strecke, auf der die Windungen parallel zu der die Überlappungsnaht bildenden Kante des Bandes verlaufen, kürzer ist, als die Strecken zwischen den beiden End- bzw. Wendepunkten der Heizleiter an der gegenüberliegenden Kante. Dadurch ist gewährleistet, daß beim Herumlegen des Bandes um die Verbindungsstelle, eine Überdeckung und damit ein Kurzschluß zwischen den Heizleitern vermieden ist.According to a particularly advantageous embodiment of the invention provided that the turns to that forming the overlap seam Edge of the tape parallel and to the the peripheral seams with the ends of the pipe-forming edges at an angle of 1.5 to 10 degrees run. It is essential that the route on which the Turns parallel to the edge of the overlap seam Band runs, is shorter than the distances between the two End or turning points of the heating conductors on the opposite Edge. This ensures that when laying the tape around the connection point, an overlap and thus a short circuit between the heating conductors is avoided.

Der Abstand zwischen den einzelnen Windungen sollte zwischen 5 und 10 mm betragen. Die Anschlußenden des Heizleiters, über welche dem Heizleiter die erforderliche Spannung zugeführt wird, treten zweckmäßigerweise an einer Seite des Bandes aus. Dadurch wird die Anschlußtechnik wesentlich vereinfacht.The distance between the individual turns should be between 5 and 10 mm. The connection ends of the heating conductor, via which the Heating conductor is supplied with the required voltage expediently on one side of the belt. This will make the Connection technology significantly simplified.

Die Erfindung betrifft weiterhin ein Verfahren zur Herstellung eines Bandes, welches sich dadurch auszeichnet, daß der Heizleiter in Windungen in den Randbereichen verlegt und durch Erwärmung des Heizleiters in die Oberfläche des Kunststoffbandes eingedrückt wird. Das Erwärmen und Eindrücken geschieht zweckmäßigerweise unmittelbar nach der Verlegung, vorteilhafterweise durch eine beheizte Walze, welche gleichzeitig die Erwärmung und das Eindrücken vollzieht. Alternativ ist es auch möglich die vorgeformten Heizleiterwindungen auf das Kunststoffband aufzulegen, zu erwärmen und in das Kunststoffband einzupressen. Insbesondere wenn man einen hartgezogenen Kupferdraht als Heizleiter verwendet, sind die Heizleiterwindungen relativ stabil, so daß beim Einpressen in das Kunststoffband eine Veränderung des Abstandes zwischen den einzelnen Heizleiterwindungen nicht zu befürchten ist. Die Verwendung eines hartgezogenen Kupferdrahtes hat auch noch den Vorteil, daß beim Schweißvorgang ebenfalls eine Verlagerung der Heizleiterwindungen infolge der Druckanwendung beim Schweißen nicht befürchtet werden muß.The invention further relates to a method for producing a Band, which is characterized in that the heating conductor in Lay turns in the edge areas and by heating the Heating conductor is pressed into the surface of the plastic strip. The heating and pressing in is expediently done immediately after laying, advantageously by a heated roller, which is simultaneously warming and indenting. Alternatively, it is also possible to use the preformed heating conductor turns hang up on the plastic tape, heat and into the  Press in plastic tape. Especially if you have one Hard-drawn copper wire used as a heating conductor are the Heating conductor turns relatively stable, so that when pressed into the Plastic tape a change in the distance between each Heating conductor turns are not to be feared. The use of a hard drawn copper wire also has the advantage that when Welding process also a shift of the heating conductor turns are not to be feared due to the application of pressure during welding got to.

Die Erfindung ist anhand der in den Fig. 1 bis 3 schematisch dargestellten Ausführungsbeispiele näher erläutert.The invention is explained in more detail with reference to the exemplary embodiments shown schematically in FIGS. 1 to 3.

In der Fig. 1 ist ein Band 1 aus thermoplastischem Kunststoff, vorzugsweise Polyethylen, dargestellt, welches zur Abdeckung einer Verbindungsstelle für Rohre aus thermoplastischem Kunststoff geeignet ist. Das Band 1 wird um die Verbindungsstelle herumgelegt, und zwar mit überlappenden Bandkanten und durch Anliegen einer Spannung an den Heizleiter 2 sowohl mit den Enden der Kunststoffrohre als auch im Bereich der Überlappung verschweißt. In die Oberfläche des Kunststoffbandes 1 ist der Heizleiter 2 eingelassen, und zwar in Form mehrerer parallel zueinander verlaufenden Windungen 3. Die Windungen 3 verlaufen im Bereich der Kanten 4, 5 und 6 des Bandes 1, wogegen die Kante 7 von Windungen frei ist. Im Bereich der Bandkanten 4 und 6 verlaufen die Windungen 3 unter einem Winkel zu den Längskanten 4 und 6, wogegen Sie im Bereich der Längskante 5 parallel zur Längskante 5 verlaufen. Die Strecke zwischen den Umlenkpunkten 8 und 9 im Bereich der Längskante 5 ist kürzer als die Strecke zwischen den Umlenkbereichen 10 und 11 im Bereich der Längskante 7, so daß beim Formen des Bandes 1 zum Rohr die Strecke zwischen den Punkten 8 und 9 zwischen den Punkten 10 und 11 zu liegen kommt. Dadurch soll ein Kurzschluß zwischen einzelnen Heizleiterwindungen vermieden werden. Zum Anschließen einer für den Schweißvorgang erforderlichen, nicht dargestellten Spannungsquelle sind die Enden des Heizleiters 2 wie bei 12 und 13 dargestellt, aus dem Band 1 herausgeführt. In the FIG. 1 is a belt 1 made of thermoplastic material, preferably polyethylene, shown, which is suitable for covering a joint for pipes made of thermoplastic material. The tape 1 is placed around the connection point, with overlapping tape edges and by applying a voltage to the heating conductor 2, welded to both the ends of the plastic tubes and in the area of the overlap. The heating conductor 2 is embedded in the surface of the plastic strip 1 , in the form of several turns 3 running parallel to one another. The turns 3 run in the area of the edges 4 , 5 and 6 of the band 1 , whereas the edge 7 is free of turns. In the area of the band edges 4 and 6 , the turns 3 run at an angle to the longitudinal edges 4 and 6 , whereas in the area of the longitudinal edge 5 they run parallel to the longitudinal edge 5 . The distance between the deflection points 8 and 9 in the area of the longitudinal edge 5 is shorter than the distance between the deflection areas 10 and 11 in the area of the longitudinal edge 7 , so that the distance between the points 8 and 9 between the points when the band 1 is formed into a tube 10 and 11 comes to rest. This is to avoid a short circuit between individual heating conductor turns. To connect a voltage source (not shown) required for the welding process, the ends of the heating conductor 2 are led out of the strip 1 as shown at 12 and 13 .

In Abänderung zu dem in der Fig. 1 geradlinigen Verlauf des Heizleiters 2 bzw. der Windungen 3 kann es von Vorteil sein, dem Heizleiter 2 bzw. den Windungen einen sinusförmigen Verlauf zu geben, so daß der Heizleiter 2 Längendehnungen infolge einer Erwärmung in sich selbst kompensieren kann. Der sinusförmige Verlauf der Windungen 3 muß dabei so gewählt sein, daß der Abstand zwischen den benachbarten Windungen 3 an jeder Stelle nahezu gleich ist.In a modification to the straight in Fig. 1 during the heating conductor 2 and the coils 3, it may be advantageous to provide the heating conductors 2 and the turns of a sinusoidal waveform, so that the heating conductor 2 elongations due to heating in itself can compensate. The sinusoidal course of the turns 3 must be chosen so that the distance between the adjacent turns 3 is almost the same at every point.

Der Heizleiter 2 ist zweckmäßigerweise ein Kupferdraht, der nahezu vollständig in die Oberfläche des Kunststoffbandes 1 eingelassen ist.The heating conductor 2 is expediently a copper wire which is almost completely embedded in the surface of the plastic strip 1 .

In der Fig. 2 ist das Kunststoffband 1 im Schnitt dargestellt und zeigt die einzelnen Windungen 3 des Heizleiters 2, die nahezu vollständig in die Oberfläche des Kunststoffbandes eingelassen sind.In Fig. 2 the plastic tape 1 is shown in section and shows the individual turns 3 of the heating conductor 2 , which are almost completely embedded in the surface of the plastic tape.

Mit besonderem Vorteil wird ein Heizleiter 2 aus einem hartgezogenen Kupferdraht verwendet, der aufgrund seiner beim Ziehvorgang erfahrenen Härte relativ starr ist, so daß eine Veränderung des Abstandes zwischen den einzelnen Windungen 3 des Heizleiters 2 nicht befürchtet werden muß. Dies ist von Vorteil sowohl beim Eindrücken des Heizleiters 2 in die Oberfläche des Kunststoffbandes 1 als auch beim eigentlichen Schweißvorgang.A heating conductor 2 made of a hard-drawn copper wire is used with particular advantage, which is relatively rigid due to its hardness experienced during the drawing process, so that there is no need to fear a change in the distance between the individual turns 3 of the heating conductor 2 . This is advantageous both when the heating conductor 2 is pressed into the surface of the plastic strip 1 and during the actual welding process.

Die Herstellung des in den Fig. 1 und 2 dargestellten Bandes kann beispielsweise dadurch geschehen, daß man auf das Kunststoffband 1 den wie in der Fig. 1 dargestellten Heizleiter 2 mit den einzelnen Windungen 3 auflegt, eine Spannungsquelle an die Enden 12 und 13 anlegt und dabei den Heizleiter 2 erwärmt und mittels einer Andrückvorrichtung, beispielsweise einer Metallplatte, den Heizleiter 2 in die Oberfläche des Kunststoffbandes 1 einpreßt.The preparation of the belt shown in FIGS. 1 and 2 can for example be done in that the hanging up with the individual turns 3 on the plastic tape 1 as shown in the Fig. 1 illustrated heating conductor 2, applying a voltage source to the ends 12 and 13 and thereby heats the heating conductors 2 and einpreßt by means of a pressing device, for example a metal plate, the heating conductor 2 in the surface of the plastic tape. 1

Günstiger erscheint jedoch ein Verfahren, wie es in der Fig. 3 schematisch dargestellt ist. Hierzu wird das Kunststoffband 1 auf einer ebenen Unterlage befestigt und der Heizleiter 2 mittels einer in jeder Richtung bewegbaren Vorrichtung 14 verlegt. Die Vorrichtung besteht im wesentlichen aus einem Halterahmen 15, in welchem eine Vorratsspule 16, ein Verlegearm 17 sowie eine Andrückrolle 18 befestigt bzw. gelagert sind. Die Vorrichtung 15 wird entlang der Kanten 4, 5, 6 und wieder zurück bewegt, wobei der Heizleiter 2 kontinuierlich von der Vorratsspule 16 abgezogen und mittels der beheizbaren Walze 18 in die Oberfläche des Kunststoffbandes eingedrückt wird.However, a method that is shown schematically in FIG. 3 appears more favorable. For this purpose, the plastic strip 1 is fastened on a flat base and the heating conductor 2 is laid by means of a device 14 which can be moved in any direction. The device essentially consists of a holding frame 15 , in which a supply spool 16 , a laying arm 17 and a pressure roller 18 are fastened or mounted. The device 15 is moved along the edges 4 , 5 , 6 and back again, the heating conductor 2 being continuously withdrawn from the supply spool 16 and pressed into the surface of the plastic strip by means of the heatable roller 18 .

Bei einem bevorzugt zu verwendenden harten Kupferdraht als Heizleiter 2 ist es zweckmäßig, die Drahtführung 17 in unmittelbarer Nähe der Andrückrolle 18 anzuordnen. Vorteilhaft erscheint es ferner, wenn die Vorratsspule 16 oberhalb der Andrückwalze 18 angeordnet wird, um damit ein leichteres Verfahren der Vorrichtung 15 entlang des vorgegebenen Windungsverlaufes zu ermöglichen.In the case of a hard copper wire to be used as the heating conductor 2 , it is expedient to arrange the wire guide 17 in the immediate vicinity of the pressure roller 18 . It also appears to be advantageous if the supply spool 16 is arranged above the pressure roller 18 in order to enable the device 15 to be moved more easily along the predetermined winding course.

Claims (7)

1. Band aus thermoplastischem Kunststoff zur Abdeckung einer Verbindungsstelle von Rohren aus Kunststoff, wobei das Kunststoffband auf den Enden der zu verbindenden Rohre aufliegend um die Verbindungsstelle mit überlappenden Längskanten herumgelegt und im Bereich der überlappenden Längskanten und mit den Enden der Rohre mittels eines Heizleiters verschweißt ist, insbesondere zur Abdeckung der Verbindungsstelle von wärmeisolierten Leitungsrohren, welche aus einem mediumführenden Innenrohr einer Wärmeisolationsschicht sowie einem Außenrohr aus thermoplastischem Kunststoff bestehen, dadurch gekennzeichnet, daß der Heizleiter (2) in mindestens zwei nahezu parallel zueinander verlaufenden Windungen (3) in drei Randbereichen (4, 5, 6) des Kunststoffbandes (1) verlegt und in die Oberfläche des Kunststoffbandes (1) eingelassen ist. 1. Tape made of thermoplastic to cover a connection point of pipes made of plastic, the plastic tape lying on the ends of the pipes to be connected lying around the connection point with overlapping longitudinal edges and being welded in the area of the overlapping longitudinal edges and to the ends of the pipes by means of a heating conductor , in particular for covering the connection point of heat-insulated conduit pipes, which consist of a medium-carrying inner pipe of a heat insulation layer and an outer pipe made of thermoplastic, characterized in that the heating conductor ( 2 ) in at least two turns ( 3 ) running almost parallel to one another in three edge areas ( 4 , 5 , 6 ) of the plastic tape ( 1 ) is laid and embedded in the surface of the plastic tape ( 1 ). 2. Band nach Anspruch 1, dadurch gekennzeichntet, daß die Windungen (3) einen leicht sinusförmigen Verlauf aufweisen.2. Band according to claim 1, characterized in that the turns ( 3 ) have a slightly sinusoidal course. 3. Band aus Kunststoff nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Windungen (3) zu der die Überlappungsnaht bildenden Kante (5) des Bandes (1) parallel und zu den die Umfangsnähte mit den Enden der Rohre bildenden Kanten (4, 6) unter einem Winkel von 1,5 bis 10 Grad verlaufen.3. Plastic tape according to claim 1 or 2, characterized in that the windings ( 3 ) to the edge forming the overlap seam ( 5 ) of the tape ( 1 ) parallel and to the peripheral seams forming the ends of the tubes edges ( 4 , 6 ) run at an angle of 1.5 to 10 degrees. 4. Band aus Kunststoff nach Anspruch 1 oder einem der folgenden, dadurch gekennzeichnet, daß der Abstand zwischen den einzelnen Windungen (3) zwischen 5 und 10 mm beträgt.4. Plastic band according to claim 1 or one of the following, characterized in that the distance between the individual turns ( 3 ) is between 5 and 10 mm. 5. Band aus Kunststoff nach Anspruch 1 oder einem der folgenden, dadurch gekennzeichnet, daß die Anschlußenden (12, 13) des Drahtes (2) an einer Seite des Bandes (1) austreten.5. Plastic band according to claim 1 or one of the following, characterized in that the connection ends ( 12 , 13 ) of the wire ( 2 ) emerge on one side of the band ( 1 ). 6. Verfahren zur Herstellung eines Bandes nach Anspruch 1 oder einem der folgenden, dadurch gekennzeichnet, daß der Heizleiter in Windungen in den Randbereichen verlegt und durch Erwärmung des Heizleiters in die Oberfläche des Kunststoffbandes eingedrückt wird.6. A method for producing a tape according to claim 1 or one the following, characterized in that the heating conductor in Lay turns in the edge areas and by heating the Heating conductor pressed into the surface of the plastic tape becomes. 7. Verfahren nach zur Herstellung eines Bandes nach Anspruch 1 oder einem der folgenden, dadurch gekennzeichnet, daß die vorgeformten Heizleiterwindungen auf das Kunststoffband aufgelegt, erwärmt und in das Kunststoffband eingepreßt werden.7. The method according to the manufacture of a tape according to claim 1 or one of the following, characterized in that the preformed Heating conductor turns placed on the plastic band, heated and be pressed into the plastic band.
DE19873712356 1987-04-11 1987-04-11 Thermoplastic band for covering a joint of plastic pipes Withdrawn DE3712356A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE19873712356 DE3712356A1 (en) 1987-04-11 1987-04-11 Thermoplastic band for covering a joint of plastic pipes
DK186488A DK186488A (en) 1987-04-11 1988-04-06 TAPE OF THERMOPLASTIC TO COVER A PLACEMENT BETWEEN PLASTIC PIPES

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19873712356 DE3712356A1 (en) 1987-04-11 1987-04-11 Thermoplastic band for covering a joint of plastic pipes

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995025243A1 (en) * 1994-03-17 1995-09-21 N.V. Raychem S A Wraparound cover
FR2743525A1 (en) * 1996-01-17 1997-07-18 Toa Kokyu Tugitebarubu Seizo C Welding plastics sheets
WO1999033619A1 (en) * 1997-12-24 1999-07-08 Msa Engineering Systems Limited Wirelaying tool
US6245174B1 (en) 1995-05-31 2001-06-12 Johannes Maria Cordia Heat recoverable article
US7069637B2 (en) 1997-12-24 2006-07-04 Msa Engineering Systems Limited Wirelaying tool
DE102006001777A1 (en) * 2006-01-12 2007-07-19 Ses Rfid Solutions Gmbh Attaching wire coil to plastic sheet for use in transponder assembly in chip card involves passing current through coil to heat it so that coil sinks into thermoplastic sheet

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995025243A1 (en) * 1994-03-17 1995-09-21 N.V. Raychem S A Wraparound cover
US6245174B1 (en) 1995-05-31 2001-06-12 Johannes Maria Cordia Heat recoverable article
FR2743525A1 (en) * 1996-01-17 1997-07-18 Toa Kokyu Tugitebarubu Seizo C Welding plastics sheets
WO1999033619A1 (en) * 1997-12-24 1999-07-08 Msa Engineering Systems Limited Wirelaying tool
US6530139B1 (en) 1997-12-24 2003-03-11 Msa Engineering Systems Limited Wirelaying tool
US7069637B2 (en) 1997-12-24 2006-07-04 Msa Engineering Systems Limited Wirelaying tool
DE102006001777A1 (en) * 2006-01-12 2007-07-19 Ses Rfid Solutions Gmbh Attaching wire coil to plastic sheet for use in transponder assembly in chip card involves passing current through coil to heat it so that coil sinks into thermoplastic sheet
DE102006001777B4 (en) * 2006-01-12 2008-01-31 Ses Rfid Solutions Gmbh Method for generating a spatial image with a transponder

Also Published As

Publication number Publication date
DK186488A (en) 1988-10-12
DK186488D0 (en) 1988-04-06

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