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DE7121715U - Widerstandsheizelement zum Ver schweißen von Gegenstanden aus thermo plastischem Kunststoff - Google Patents

Widerstandsheizelement zum Ver schweißen von Gegenstanden aus thermo plastischem Kunststoff

Info

Publication number
DE7121715U
DE7121715U DE7121715U DE7121715DU DE7121715U DE 7121715 U DE7121715 U DE 7121715U DE 7121715 U DE7121715 U DE 7121715U DE 7121715D U DE7121715D U DE 7121715DU DE 7121715 U DE7121715 U DE 7121715U
Authority
DE
Germany
Prior art keywords
wire winding
resistance wire
welding
heating element
thermoplastic
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.)
Expired
Application number
DE7121715U
Other languages
English (en)
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.)
Vodafone GmbH
Original Assignee
Mannesmann AG
Publication date
Publication of DE7121715U publication Critical patent/DE7121715U/de
Expired 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
    • B29C65/02—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
    • B29C65/348—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 with a polymer coating
    • 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
    • B29C65/3424—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 the form of a coil spring
    • 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
    • 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
    • B29C66/13—Single flanged joints; Fin-type joints; Single hem joints; Edge joints; Interpenetrating fingered joints; Other specific particular designs of joint cross-sections not provided for in groups B29C66/11 - B29C66/12
    • B29C66/131—Single flanged joints, i.e. one of the parts to be joined being rigid and flanged in the joint area
    • 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
    • B29C66/242—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 closed, i.e. forming closed contours
    • B29C66/2424—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 closed, i.e. forming closed contours being a closed polygonal chain
    • B29C66/24249—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 closed, i.e. forming closed contours being a closed polygonal chain forming a specific polygon not provided for in B29C66/24241 - B29C66/24243
    • 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
    • B29C66/303—Particular design of joint configurations the joint involving an anchoring effect
    • B29C66/3034—Particular design of joint configurations the joint involving an anchoring effect making use of additional elements, e.g. meshes
    • 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
    • B29C66/32—Measures for keeping the burr form under control; Avoiding burr formation; Shaping the burr
    • B29C66/322—Providing cavities in the joined article to collect the burr
    • 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
    • B29C66/5224—Joining tubular articles for forming fork-shaped connections, e.g. for making Y-shaped pieces
    • B29C66/52241—Joining tubular articles for forming fork-shaped connections, e.g. for making Y-shaped pieces with two right angles, e.g. for making T-shaped pieces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5229—Joining tubular articles involving the use of a socket
    • B29C66/52298—Joining tubular articles involving the use of a socket said socket being composed by several elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • 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
    • B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
    • B29C66/828—Other pressure application arrangements
    • B29C66/8286—Hand placed clamps
    • 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
    • F16L47/26—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics for branching pipes; for joining pipes to walls; Adaptors therefor
    • F16L47/28—Joining pipes to walls or to other pipes, the axis of the joined pipe being perpendicular to the wall or to the axis of the other pipe
    • F16L47/30—Joining pipes to walls or to other pipes, the axis of the joined pipe being perpendicular to the wall or to the axis of the other pipe using attaching means embracing the pipe
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/3468—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the means for supplying heat to said heated elements which remain in the join, e.g. special electrical connectors of windings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L47/00—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
    • F16L47/02—Welded joints; Adhesive joints
    • F16L47/03—Welded joints with an electrical resistance incorporated in the joint

Landscapes

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

Description

1 Berlin 33 (Grunewftkf) ffl±0ia.
Fall 3325 MANNESMANN AKTIENGESELLSCHAFT, 4 DüsseDdorf 1, Mannesmannufer 2,
Widerstandsheizelement zum Verschweißen von Gegenständen aus thermoplastischem Kunststoff
Die Neuerung betrifft ein Heizelement zum Herstellen einer flächigen Schweißverbindung von Gegenständen aus thermoplastischem Kunststoff, bestehend aus einer in der Schweißzone verbleibenden, gewendelten Widerstandsdrahtwicklung, insbesondere zum Aufschweißen eines Sattelstückes auf die Oberfläche eines Rohres.
Heizelemente zur Schweißverbindung von thermoplastischen Kunststoffteilen sind bekannt. Sie bestehen im wesentlichen aus einem oder mehreren metallischen Widerstandsdrähten, die zwischen den miteinander zu verbindenden Kunetstoffteilen angeordnet sind und denen ein elektrischer Strom zugeführt wird. Durch die dabei entstehende Wärme wird der Kunststoff flüssig, so daß die Verbindungsstellen zusammenfließen und sich dadurch homogen miteinander verbinden. Das Widerstandsheizelement verbleibt nach Beendigung des Schweißvorganges in der Verbindung.
Derartige Heizelemente haben vor allem für das Verschweißen der Enden von Kunststoffrohren Verbreitung gefunden, wie es beispielsweise in der DPS 1 055 305 dargestellt ist. Gemäß der DPS 863 255 ist es ferner bekanntgeworden, die Stoßkanten von Fußbodenbelägen aus thermoplastischem Kunststoff dadurch miteinander zu verbinden, daß eine dazwischen angeordnete Drahtspirale als Heizelement verwendet wird, die vorzugsweise mit einer Kunststoffummantelung versehen ist.
• · I
-2-
Die bekannten Widerstandsheizelemente sind Im wesentlichen für die Verwendung in Schweißmuffen oder für das örtliche Verschweißen der Kunststoffteile geeignet, nicht aber für das Verbinden von größeren Flächen, wie zum Beispiel für das Aufschweißen von Sattelstücken auf die Oberfläche von Rohren. Eine Herstellung derartiger Schweißverbindungen hat sich die Neuerung zur Aufgabe gestellt, die dadurch gelöst wird, daß als Heizelement eine Widerstandsdrahtwicklung verwendet wird, die in Gestalt eines flachen Sternes ausgebildet ist.
Gemäß den weiteren Merkmalen der Neuerung ist es empfehlenswert, daß die Widerstandsdrahtwicklung ringförmig geschlossen ist und die Anschlüsse für die Stromzuführung an zwei einander gegenüberliegenden Seiten des Sternes angeordnet sind. Auch ist vorteilhaft, daß die Widerstandsdrahtwicklung in an sich bekannter Weise mit» einet" tiiei-üioplä3tj.scnsn Kunststoff= schicht überzogen ist, welche vorzugsweise durch kurzzeitiges Erhitzen der in einer Kunststoffpulveraufschüttung eingebetteten Widerstandsdrahtwicklung erzeugt worden ist.
Das Heizelement kann als ein loses Teil vor dem Verschweißen zwischen die zu verbindenden Flächen gelegt werden. In manchen Fällen empfiehlt es sich jedoch, daß es bereits vor dem Zusammenbringen der Teile mit einem von ihnen durch Schweißen verbunden ist.
Für das Verbinden der Teile ist es zu empfehlen, daß während des Schweißvorganges das eine Teil gegen das andere gedrückt wird, so daß die Widerstandsdrahtvricklung in beide zu verbindenden ^lachen eingepreßt wird.
In der Zeichnung ist ein Ausführungsbeispiel der Neuerung dargestellt, und zwar zeigen:
Abbildung 1 einen Längsschnitt durch die Schweißverbindung einer Anbohrschelle mit einem Rohr und
Abbildung 2 eine entsprechende stirnseitige Ansicht, Abbildung 3 eine Seitenansicht des Heizelementes und Abbildung 4 eine teilweise geschnittene Draufsicht hierauf.
Das Heizelement besteht aus dem gewendelten Widerstandsdraht J, der in der thermoplastischen Kunststoffschicht 4 eingebettet und in Forme eines flachen Sternes ausgebildet ist. Die Drahtwicklung selbst ist ringförmig geschlossen, und die Zuleitung des elektrischen Heizstromes erfolgt über die einander gegenüberliegenden Anschlüsse 8 und 9. Zur Verbindung des thermoplastischen Kunststoffrohres 1 mit der Anbohrschelle 2 aus dem gleichen Werkstoff wird die sternförmige Heizdrahtwicklung 2 zwischen die Rohroberfläche und das Sattelstück der Anbohrschelle gebracht, worauf der Heizstrom eingeschaltet wird. Während des Schweißvorganges wird das Sattelstück der Anbohrschelle gegen das Rohr gedrückt, was mit Hilfe des zweigeteilten Spannbügels 5 und der auf den Haltebolzen 6 aufgesetzten Druckfedern 7 erfolgt. Das Heizelement wird dabei durch diese Anordnung in die beiden zusammenfließenden Flächen eingedrückt, wodurch eine gas- und f.lüssigkeitsdichte Verbindung der Anbohrschelle mit dem Rohr erzeugt wird. Das Sattelstück der Anbohrschelle 2 v/eist in einer b3vorzugten Ausführung gemäß Abbildung eine die sternförmige Drahtwicklung 5 umgebende nutförmige Vertiefung 10 auf, in welche die beim Schweißvorgang flüssig gewordene thermoplastische Drahtumhüllung 4 ohne nennenswerten Fließwiderstand abfließen kann.
- Schutzansprüche -

Claims (4)

Schutzansprüche
1.
Heizelement zum Herstellen einer flächigen Schweißverbindung von Gegenständen aus thermoplastischem Kunststoff, bestehend aus einer in der Schweißzone verbleibenden, gewendelten Widerstandsdrahtwicklung, insbesondere zum Aufschweißen eines SattelstücWes auf die Oberfläche eines Rohres,
dadurch gekennzeichnet,
daß die Widerstandsdrahtwicklung (3) in Gestalt eines flachen Sternes ausgebildet ist.
2.Heizelement nach Anspruch 1, dadurch gekennzeichnet, daß die Widerstandsdrahtwicklung ringförmig geschlossen ist und die Anschlüsse für die Stromzuführung an zwei einander gegenüberliegenden Seiten (8, 9) des Sternes angeordnet sind.
Heiselement nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, daß die Widerstandsdrahtwicklung in an sich bekannter Weise mit einer thermoplastischen Kunststoffschicht (4) überzogen ist, welche vorzugsweise durch kurzzeitiges Erhitzen der in einer Kunststoffpulveraufschüttung eingebetteten Widerstandsdrahtwicklung erzeugt worden ist.
4.
Heizelement nach den Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Widerstandsdrahtwicklung mit einem der beiden zu verbindenden Teile durch Schweißen verbunden ist, wobei dieses Teil vorzugsweise eine sternförmige Drahtwick·; lung (3) umgebende, zur Aufnahme der beim Schweißen verdrj ten thermoplastischen Drahtumhüllung (4) dienende » mige Vertiefung ty 0J^TfTS ^2 Q 71
DE7121715U Widerstandsheizelement zum Ver schweißen von Gegenstanden aus thermo plastischem Kunststoff Expired DE7121715U (de)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2164272A5 (de) * 1971-12-03 1973-07-27 Fischer Ag Georg
DE2848382A1 (de) * 1978-09-12 1980-03-20 Von Roll Ag Muffe zum verbinden von leitungselementen
DE3523014C1 (en) * 1985-06-27 1987-01-02 Friedrichsfeld Gmbh Electrical welding fitting or welding collar
DE3611192A1 (de) * 1986-04-04 1987-10-15 Riesselmann & Sohn Verfahren zum verschweissen stumpfgestossener rohre aus kunststoff und schweisselement zur durchfuehrung des verfahrens
DE19653465C1 (de) * 1996-12-20 1998-04-30 Daimler Benz Ag Verfahren zum thermischen Verformen eines Kunststoffmaterials und Beispiel für ein nach diesem Verfahren umformbares Formteil
DE19705327C2 (de) * 1996-02-22 2002-04-18 Fischer Georg Rohrleitung Verfahren zur Stumpfstoß-Verbindung zweier Kunststoffrohre und Vorrichtung zur Durchführung des Verfahrens
EP3145697A4 (de) * 2014-05-19 2018-01-03 Plasson Ltd Elektrofusionssattel

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2164272A5 (de) * 1971-12-03 1973-07-27 Fischer Ag Georg
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DE3611192A1 (de) * 1986-04-04 1987-10-15 Riesselmann & Sohn Verfahren zum verschweissen stumpfgestossener rohre aus kunststoff und schweisselement zur durchfuehrung des verfahrens
DE19705327C2 (de) * 1996-02-22 2002-04-18 Fischer Georg Rohrleitung Verfahren zur Stumpfstoß-Verbindung zweier Kunststoffrohre und Vorrichtung zur Durchführung des Verfahrens
DE19653465C1 (de) * 1996-12-20 1998-04-30 Daimler Benz Ag Verfahren zum thermischen Verformen eines Kunststoffmaterials und Beispiel für ein nach diesem Verfahren umformbares Formteil
EP3145697A4 (de) * 2014-05-19 2018-01-03 Plasson Ltd Elektrofusionssattel

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