CH347051A - Method for welding pipes made of thermoplastic material and device for carrying out the method - Google Patents

Method for welding pipes made of thermoplastic material and device for carrying out the method

Info

Publication number
CH347051A
CH347051A CH347051DA CH347051A CH 347051 A CH347051 A CH 347051A CH 347051D A CH347051D A CH 347051DA CH 347051 A CH347051 A CH 347051A
Authority
CH
Switzerland
Prior art keywords
mandrel
heating plate
flanges
pipe
flange
Prior art date
Application number
Other languages
German (de)
Inventor
Andre Dr Schaerer
Original Assignee
Abegg & Co Ag
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 Abegg & Co Ag filed Critical Abegg & Co Ag
Publication of CH347051A publication Critical patent/CH347051A/en

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
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/20—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools with direct contact, e.g. using "mirror"
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C57/00—Shaping of tube ends, e.g. flanging, belling or closing; Apparatus therefor, e.g. collapsible mandrels
    • 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
    • B29C66/02—Preparation of the material, in the area to be joined, prior to joining or welding
    • B29C66/022—Mechanical pre-treatments, e.g. reshaping
    • B29C66/0222—Mechanical pre-treatments, e.g. reshaping without removal of material, e.g. cleaning by air blowing or using brushes
    • 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
    • B29C66/1312—Single flange to flange joints, the parts to be joined being rigid
    • 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
    • B29C66/348—Avoiding melting or weakening of the zone directly next to the joint area, e.g. by cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5221—Joining tubular articles for forming coaxial connections, i.e. the tubular articles to be joined forming a zero angle relative to each other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/24—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools characterised by the means for heating the tool
    • B29C65/30—Electrical means
    • B29C65/305—Electrical means involving the use of cartridge heaters
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/919—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges
    • B29C66/9192—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges in explicit relation to another variable, e.g. temperature diagrams
    • B29C66/91921—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges in explicit relation to another variable, e.g. temperature diagrams in explicit relation to another temperature, e.g. to the softening temperature or softening point, to the thermal degradation temperature or to the ambient temperature
    • B29C66/91931—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges in explicit relation to another variable, e.g. temperature diagrams in explicit relation to another temperature, e.g. to the softening temperature or softening point, to the thermal degradation temperature or to the ambient temperature in explicit relation to the fusion temperature or melting point of the material of one of the parts to be joined
    • B29C66/91933—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges in explicit relation to another variable, e.g. temperature diagrams in explicit relation to another temperature, e.g. to the softening temperature or softening point, to the thermal degradation temperature or to the ambient temperature in explicit relation to the fusion temperature or melting point of the material of one of the parts to be joined higher than said fusion temperature
    • 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

Landscapes

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

Description

       

  
 



  Verfahren zum Verschweissen aus thermoplastischem Kunststoff bestehender Rohre und Vorrichtung zur Durchführung des Verfahrens
Das Patent betrifft ein Verfahren zum Verschweissen von Rohren, die aus thermoplastischem Kunststoff, vorzugsweise aus Polyolefinen, z. B.



  Polyäthylen, bestehen, und eine Vorrichtung zur Durchführung des Verfahrens.



   Nach dem erfindungsgemässen Verfahren werden die miteinander zu vereinigenden Stirnflächen an den Rohrenden ausgebildeter Flansche einander gegen über in Berührung mit je einer Seite einer Heizplatte gebracht, welche den an diese Flächen angrenzenden Kunststoff auf Schweisstemperatur erhitzt, wonach die Heizplatte entfernt und die Flansche zusammengepresst werden. Vorzugsweise wird die Heizplatte mittels eines eingebauten, elektrischen Heizkörpers erhitzt. Dabei können die Flansche an den Rohrenden durch Einführen eines Dorns gebildet werden, welcher einen dem innern Rohrquerschnitt angepassten Teil und einen dem zu bildenden Flansch angepassten Teil aufweist, wobei der letztgenannte Teil auf eine zur thermoplastischen Verformung des Kunststoffes geeignete Temperatur erhitzt wird.



  Zweckmässig kann der erstgenannte Teil des Dorns mittels eines durch wenigstens einen in diesem Teil vorgesehenen Hohlraum zirkulierenden Kühlmittels gekühlt und der zweitgenannte Teil des Dorns mittels eines eingebauten, elektrischen Heizkörpers erhitzt werden.



   Die erfindungsgemässe Vorrichtung zur   Durch-    führung des Verfahrens nach der Erfindung zeichnet sich aus durch einen Dorn mit einem dem lichten Querschnitt der zu verschweissenden Rohre angepassten Teil und einem dem zu bildenden Flansch angepassten, erwärmbaren Teil. Zweckmässig enthält der ertstgenannte Teil des Dorns einen Hohlraum für ein Kühlmittel und der zweitgenannte Teil des Dorns einen elektrischen Heizkörper.



   Das erfindungsgemässe Verfahren und die erfindungsgemässe Vorrichtung werden im folgenden an Hand der Zeichnung beispielsweise beschrieben. Es zeigen:
Fig. 1 zwei Rohrenden, deren Flansche einander gegenüber mit je einer Seite einer Heizplatte in Berührung gebracht sind, im Längsschnitt,
Fig. 2 zwei Rohrenden, deren Flansche miteinander verschweisst sind, teilweise im Längsschnitt,
Fig. 3 ein Rohrende, mit einem zwecks Herstellung eines Flansches eingeführten Dorn, im Längsschnitt.



   Gemäss Fig. 1 werden zum Verschweissen zweier Kunststoffrohre I und 2 die Stirnseiten an den Rohrenden ausgebildeter Flansche 3 und 4 einander gegenüber mit beiden Seiten einer Heizplatte 5 in Berührung gebracht. Diese Heizplatte enthält einen (nicht dargestellten) elektrischen Heizkörper, welcher mit aussenliegenden Anschlüssen   5' in    Verbindung steht. Die Heizplatte wird durch Anschliessen dieses Heizkörpers an eine Stromquelle auf eine Temperatur gebracht, welche die an der Heizplatte anliegenden Flansche 3, 4 an ihren Stirnseiten auf eine zum Schweissen geeignete Temperatur erhitzt. Diese Temperatur muss über dem Schmelzpunkt des Kunststoffes liegen, wobei eine obere Grenze dieser Temperatur durch die Forderung gesetzt ist, dass der Kunststoff nicht oxydiert und nicht thermisch abgebaut werden soll.

   Es hat sich gezeigt, dass eine Temperatur, welche 20 bis   120ob    über dem Schmelzpunkt des Kunststoffes liegt, zum Schweissen geeignet ist und im wesentlichen weder zu einem thermischen Abbau noch zu einem Rückstand von oxydiertem Material an der Heizplatte führt. Nachdem eine Oberflächenschicht hinreichender Dicke an den Stirn  seiten der Flansche auf Schmelztemperatur gebracht wurde, werden die Rohren den von der Heizplatte abgerückt, die Heizplatte wird entfernt und die Flansche werden zusammengepresst. Die miteinander vereinigten Rohrenden haben dann das in Fig. 2 dargestellte Aussehen, die Schweisszone 10 hat eine Dicke von ungefähr 3,5 mm.



   Die Herstellung des Flansches an den Rohrenden erfolgt mittels eines Dorns, wie Fig. 3 zeigt, welche ein Rohrende mit dem eingeführten Dorn in der Phase des Verfahrens darstellt, in welcher der Dorn den Flansch bereits geformt hat. Der Dorn weist einen Teil 6 auf, der dem innern Rohrquerschnitt angepasst ist und zum konzentrischen Einführen des Dorns in das Rohrende dient. Der Dorn weist weiterhin einen dem zu formenden Flansch angepassten Teil 7 auf, der eine elektrische Heizwicklung 8 enthält und mittels dieser auf eine zur thermoplastischen Verformung des Rohrendes geeignete Temperatur erhitzt wird. Damit das Rohrende nur in dem zum Flansch zu formenden Bereich eine höhere Temperatur annimmt, wird der dem lichten Rohrquerschnitt angepasste Teil 6 des Dorns gekühlt. Zu diesem Zwecke ist in diesem Teil ein ringförmiger Hohlraum 9 vorhanden, durch den Kühlwasser zirkuliert.

   Beim Einführen des Dorns in das Rohrende bringt dessen geheizter Teil 7 das äusserste Ende des Rohres auf eine, einem thermoplastischen Zustand entsprechende Temperatur, treibt das Rohrende auseinander und formt dabei den Flansch. Dabei befindet sich der an den Flansch angrenzende Teil des Rohres am gekühlten Teil 6 des Dorns, wodurch auch nach dem Entfernen des Dorns die erforderliche Stabilität des Rohres erhalten bleibt, und ein rascheres Abkühlen des Flansches auf eine dem festen Zustand entsprechende Temperatur des Kunststoffes gefördert wird.   



  
 



  Method for welding pipes made of thermoplastic material and device for carrying out the method
The patent relates to a method for welding pipes made of thermoplastic, preferably polyolefins, e.g. B.



  Polyethylene, exist, and a device for performing the method.



   According to the method according to the invention, the end faces to be combined on the pipe ends of flanges formed are brought into contact with each other with one side of a heating plate, which heats the plastic adjoining these surfaces to welding temperature, after which the heating plate is removed and the flanges are pressed together. The heating plate is preferably heated by means of a built-in electric heater. The flanges at the pipe ends can be formed by inserting a mandrel which has a part adapted to the inner pipe cross-section and a part adapted to the flange to be formed, the latter part being heated to a temperature suitable for thermoplastic deformation of the plastic.



  The first-mentioned part of the mandrel can expediently be cooled by means of a coolant circulating through at least one cavity provided in this part, and the second-mentioned part of the mandrel can be heated by means of a built-in electrical heater.



   The device according to the invention for carrying out the method according to the invention is characterized by a mandrel with a part adapted to the clear cross section of the tubes to be welded and a heatable part adapted to the flange to be formed. The first-mentioned part of the mandrel expediently contains a cavity for a coolant and the second-mentioned part of the mandrel contains an electrical heating element.



   The method according to the invention and the device according to the invention are described below with reference to the drawing, for example. Show it:
Fig. 1 two pipe ends, the flanges of which are brought into contact opposite one another with one side of a heating plate, in a longitudinal section,
2 shows two pipe ends, the flanges of which are welded together, partly in longitudinal section,
3 shows a pipe end with a mandrel inserted for the purpose of producing a flange, in longitudinal section.



   According to FIG. 1, in order to weld two plastic pipes I and 2, the end faces of flanges 3 and 4 formed on the pipe ends are brought into contact with both sides of a heating plate 5 opposite one another. This heating plate contains an electrical heating element (not shown) which is connected to external connections 5 '. By connecting this heating element to a power source, the heating plate is brought to a temperature which heats the flanges 3, 4 adjacent to the heating plate at their end faces to a temperature suitable for welding. This temperature must be above the melting point of the plastic, an upper limit of this temperature being set by the requirement that the plastic should not be oxidized and not thermally degraded.

   It has been shown that a temperature which is 20 to 120ob above the melting point of the plastic is suitable for welding and essentially leads neither to thermal degradation nor to a residue of oxidized material on the heating plate. After a surface layer of sufficient thickness on the end faces of the flanges has been brought to the melting temperature, the pipes are pulled away from the heating plate, the heating plate is removed and the flanges are pressed together. The pipe ends united with one another then have the appearance shown in FIG. 2, the welding zone 10 has a thickness of approximately 3.5 mm.



   The flange is produced at the pipe ends by means of a mandrel, as shown in FIG. 3, which shows a pipe end with the inserted mandrel in the phase of the process in which the mandrel has already formed the flange. The mandrel has a part 6 which is adapted to the inner pipe cross section and is used for concentric introduction of the mandrel into the pipe end. The mandrel also has a part 7 which is adapted to the flange to be formed and which contains an electrical heating coil 8 and is heated by means of this to a temperature suitable for the thermoplastic deformation of the pipe end. So that the pipe end only assumes a higher temperature in the area to be formed into the flange, the part 6 of the mandrel adapted to the clear pipe cross section is cooled. For this purpose, an annular cavity 9 is provided in this part, through which cooling water circulates.

   When the mandrel is inserted into the pipe end, its heated part 7 brings the outermost end of the pipe to a temperature corresponding to a thermoplastic state, drives the pipe end apart and forms the flange in the process. The part of the pipe adjacent to the flange is located on the cooled part 6 of the mandrel, which means that the required stability of the pipe is maintained even after the mandrel has been removed, and a more rapid cooling of the flange to a temperature of the plastic corresponding to the solid state is promoted .

Claims (1)

PATENTANSPRUCH I Verfahren zum Verschweissen aus thermoplastischem Kunststoff bestehender Rohre, dadurch gekennzeichnet, dass die miteinander zu vereinigenden Stirnflächen an den Rohrenden ausgebildeter Flansche einander gegenüber in Berührung mit je einer Seite einer Heizplatte gebracht werden, welche den an diese Flächen angrenzenden Kunststoff auf Schweisstemperatur erhitzt, wonach die Heizplatte entfernt und die Flansche zusammengepresst werden. PATENT CLAIM I Method for welding pipes made of thermoplastic material, characterized in that the end faces to be united on the pipe ends of flanges formed are brought into contact opposite one another with one side of a heating plate, which heats the plastic adjoining these surfaces to welding temperature, after which the heating plate removed and the flanges pressed together. UNTERANSPRÜCHE 1. Verfahren nach Patentanspruch I, dadurch gekennzeichnet, dass die Heizplatte mittels eines eingebauten, elektrischen Heizkörpers erhitzt wird. SUBCLAIMS 1. The method according to claim I, characterized in that the heating plate is heated by means of a built-in electric heater. 2. Verfahren nach Patentanspruch I, dadurch gekennzeichnet, dass die Flansche an den Rohrenden durch Einführen eines Dorns gebildet werden, welcher einen dem innern Rohrquerschnitt angepassten Teil und einen dem zu bildenden Flansch angepassten Teil aufweist, wobei der letztgenannte Teil auf eine zur thermoplastischen Verformung des Kunststoffes geeignete Temperatur erhitzt wird. 2. The method according to claim I, characterized in that the flanges are formed at the pipe ends by inserting a mandrel which has a part adapted to the inner pipe cross-section and a part adapted to the flange to be formed, the latter part being directed to a thermoplastic deformation of the Plastic is heated to a suitable temperature. 3. Verfahren nach Patentanspruch I und Unteranspruch 2, dadurch gekennzeichnet, dass der erstgenannte Teil des Dorns mittels eines durch wenigstens einen in diesem Teil vorgesehenen Hohlraum zirkulierenden Kühlmittels gekühlt und der zweitgenannte Teil des Dorns mittels eines eingebauten, elektrischen Heizkörpers erhitzt wird. 3. The method according to claim 1 and dependent claim 2, characterized in that the first-mentioned part of the mandrel is cooled by means of a coolant circulating through at least one cavity provided in this part and the second-mentioned part of the mandrel is heated by means of a built-in electric heater. PATENTANSPRUCH II Vorrichtung zur Durchführung des Verfahrens nach Patentanspruch I und Unteransprüchen 2 und 3, gekennzeichnet durch einen Dorn mit einem dem lichten Querschnitt des zu verschweissenden Rohres angepassten Teil und einem dem zu bildenden Flansch angepassten, erwärmbaren Teil. PATENT CLAIM II Device for performing the method according to claim 1 and dependent claims 2 and 3, characterized by a mandrel with a part adapted to the clear cross section of the pipe to be welded and a heatable part adapted to the flange to be formed. UNTERANSPRUCH 4. Vorrichtung nach Patentanspruch II, dadurch gekennzeichnet, dass der erstgenannte Teil des Dorns einen Hohlraum für ein Kühlmittel und der zweitgenannte Teil des Dorns einen elektrischen Heizkörper enthält. UNDER CLAIM 4. Device according to claim II, characterized in that the first-mentioned part of the mandrel contains a cavity for a coolant and the second-mentioned part of the mandrel contains an electric heater.
CH347051D 1957-03-04 1957-03-04 Method for welding pipes made of thermoplastic material and device for carrying out the method CH347051A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH347051T 1957-03-04

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CH347051A true CH347051A (en) 1960-06-15

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2382324A1 (en) * 1977-03-02 1978-09-29 Wavin Bv METHOD AND APPARATUS FOR WELDING PLASTIC TUBES
WO1997028952A1 (en) * 1996-02-07 1997-08-14 Anthony Joseph Cesaroni Bonding of tubes into articles
EP1130303A1 (en) * 1998-10-09 2001-09-05 Sekisui Chemical Co., Ltd. Composite high-pressure pipe and method of joining same
WO2004069524A1 (en) * 2003-01-27 2004-08-19 Nike, Inc. Method for flange bonding
EP2146839A1 (en) * 2007-04-13 2010-01-27 Underground Solutions Technologies Group, Inc. Conduit, manufacture thereof and fusion process therefor
US8796407B2 (en) 2003-06-13 2014-08-05 Underground Solutions Technologies Group, Inc. Polyvinyl chloride formulations
US8906188B2 (en) 2003-06-13 2014-12-09 Underground Solutions Technologies Group, Inc. Fusion process for conduit

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2382324A1 (en) * 1977-03-02 1978-09-29 Wavin Bv METHOD AND APPARATUS FOR WELDING PLASTIC TUBES
WO1997028952A1 (en) * 1996-02-07 1997-08-14 Anthony Joseph Cesaroni Bonding of tubes into articles
EP1130303A1 (en) * 1998-10-09 2001-09-05 Sekisui Chemical Co., Ltd. Composite high-pressure pipe and method of joining same
EP1130303A4 (en) * 1998-10-09 2004-03-24 Sekisui Chemical Co Ltd Composite high-pressure pipe and method of joining same
US7094310B2 (en) 1998-10-09 2006-08-22 Sekisui Chemical Co., Ltd. Method for joining high-pressure composite pipes
WO2004069524A1 (en) * 2003-01-27 2004-08-19 Nike, Inc. Method for flange bonding
US6946050B2 (en) 2003-01-27 2005-09-20 Nike, Llc Method for flange bonding
US8796407B2 (en) 2003-06-13 2014-08-05 Underground Solutions Technologies Group, Inc. Polyvinyl chloride formulations
US8906188B2 (en) 2003-06-13 2014-12-09 Underground Solutions Technologies Group, Inc. Fusion process for conduit
US9023263B2 (en) 2003-06-13 2015-05-05 Underground Solutions Technologies Group, Inc. Fusion process for conduit
EP2146839A1 (en) * 2007-04-13 2010-01-27 Underground Solutions Technologies Group, Inc. Conduit, manufacture thereof and fusion process therefor
EP2146839A4 (en) * 2007-04-13 2013-09-11 Underground Solutions Technologies Group Inc Conduit, manufacture thereof and fusion process therefor

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