CH400547A - Process for mirror welding thermoplastic pipes and fittings using atmospheric pressure - Google Patents

Process for mirror welding thermoplastic pipes and fittings using atmospheric pressure

Info

Publication number
CH400547A
CH400547A CH1168262A CH1168262A CH400547A CH 400547 A CH400547 A CH 400547A CH 1168262 A CH1168262 A CH 1168262A CH 1168262 A CH1168262 A CH 1168262A CH 400547 A CH400547 A CH 400547A
Authority
CH
Switzerland
Prior art keywords
welding
parts
heated
opening
heating
Prior art date
Application number
CH1168262A
Other languages
German (de)
Inventor
Ernst Dipl Ing Rueede
Sager Ernst
Mouttet Charles
Original Assignee
Rollmaplast 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 Rollmaplast Ag filed Critical Rollmaplast Ag
Priority to CH1168262A priority Critical patent/CH400547A/en
Publication of CH400547A publication Critical patent/CH400547A/en

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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
    • 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
    • B29C66/826—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps without using a separate pressure application tool, e.g. the own weight of the parts to be joined
    • B29C66/8266—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps without using a separate pressure application tool, e.g. the own weight of the parts to be joined using fluid pressure directly acting on 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
    • 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
    • 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
    • B29C66/116—Single bevelled joints, i.e. one of the parts to be joined being bevelled in the joint area
    • B29C66/1162—Single bevel to bevel joints, e.g. mitre 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
    • B29C66/50—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
    • 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
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • 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
    • B29C66/824—Actuating mechanisms
    • B29C66/8242—Pneumatic or hydraulic drives
    • B29C66/82423—Pneumatic or hydraulic drives using vacuum
    • 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
    • B29C66/826—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps without using a separate pressure application tool, e.g. the own weight of the parts to be joined
    • B29C66/8266—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps without using a separate pressure application tool, e.g. the own weight of the parts to be joined using fluid pressure directly acting on the parts to be joined
    • B29C66/82661—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps without using a separate pressure application tool, e.g. the own weight of the parts to be joined using fluid pressure directly acting on the parts to be joined by means of vacuum
    • 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
    • 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)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Description

       

  
 



  Verfahren zum Spiegelschweissen thermoplastischer Rohre und Formstücke unter Ausnützung des atmosphärischen Druckes
Das Spiegelschweissen ist im Zusammenhang mit gut schweissbaren, thermoplastischen Kunststoffen, wie Polyäthylen, Polypropylen und Polyamid, bekannt. Es besteht darin, dass die zu verbindenden Flächen an einer geheizten Platte bis über den Schmelzpunkt erwärmt und hierauf durch Zusammenpressen stumpfgeschweisst werden. Das Verfahren hat sich unter anderem auch für Rohrleitungen aus thermoplastischem ;Material gut bewährt. Für grössere Rohre bietet jedoch die Erzeugung des erforderlichen Anpressdruckes beim Aufheizen der Schweissflächen und insbesondere beim Stumpfschweissen derselben gewisse Schwierigkeiten. Sofern die beiden zu verschweissenden Teile koaxial sind, lässt sich der Anpressdruck mit relativ einfachen mechanischen Hilfsmitteln realisieren.

   Handelt es sich aber um das Verschweissen komplizierterer Rohrleitungsteile, so werden die mechanischen Hilfsmittel meistens zu aufwendig.



   Gegenstand der vorliegenden Erfindung ist ein Verfahren, das das geschilderte Problem auf einfache Art zu lösen erlaubt. Es besteht darin, dass für das Zusammenpressen der angeschmolzenen Flächen der atmosphärische Druck verwertet wird, indem nach vorausgegangenem Abdecken aller Öffnungen der von den beiden zu verschweissenden Rohrleitungsteilen gebildete Hohlraum evakuiert wird, sobald die beiden Schweissflächen miteinander in Berührung gebracht worden sind.



   Die Erfindung ist durch beiliegende Zeichnungen illustriert:
Abb. 1 zeigt das Spiegelschweissen während der Stumpfschweissphase am Beispiel eines T-Stückes.



   Abb. 2 zeigt, ebenfalls am Beispiel eines T-Stükkes, das Spiegelschweissen während der Aufheizphase.



   Abb. 1 stellt das Zusammenpressen der beiden T-Stück-Teile   1' und      1" dar,    deren Schweissfläche 2 zuvor bis über den Materialschmelzpunkt erwärmt worden ist. Die Teile   3' und    3" sind Ausführungsvarianten für das Abdecken von Öffnungen. Die dritte Öffnung des T-Stückes ruht auf der als Arbeitsunterlage dienenden Fläche 5 mit gummielastischem, dichtendem Überzug 4. Der Stutzen 6 dient der Evakuation des Luftinhaltes des Formstückes. Es versteht sich, dass anstelle der Kombination 4, 5, 6, auch eine Abdeckung, ähnlich   3' oder    3", jedoch mit Evakuationsöffnung, verwendet werden könnte.



   Abb. 2 zeigt eine Möglichkeit des Aufheizens der nachmaligen Schweissflächen. Dem Beispiel ist die Situation von Abb. 1 zugrunde gelegt. Als Wärmequelle dient die elektrisch beheizte Platte 7, die einen Durchbruch   7' aufweist,    damit sich der Druck beidseitig der Platte ausgleichen kann, wenn zwecks Erzeugung von Anpresskraft der   Luftinhalt    über den in Abb. 1 dargestellten Stutzen 6 evakuiert wird. Der gleiche Effekt liesse sich natürlich auch bei einer durchgehenden Heizplatte durch gleichzeitiges Evakuieren über je eine Öffnungsabdeckung der beiden zu erwärmenden Teile erzielen.

   Eine weitere Möglichkeit des Erwärmens besteht darin, die beiden Teile mit der zu erhitzenden Stirnfläche auf die gleiche Seite einer Heizplatte zu stellen und den jeweiligen Luftinhalt über eine   Öffnungsabdek    kung oder je einen Durchbruch der Heizplatte abzusaugen.  



   PATENTANSPRUCH
Verfahren zum Spiegelschweissen thermoplastischer Rohre und Formstücke, dadurch gekennzeich 

**WARNUNG** Ende DESC Feld konnte Anfang CLMS uberlappen**.



   



  
 



  Process for mirror welding thermoplastic pipes and fittings using atmospheric pressure
Mirror welding is known in connection with easily weldable thermoplastics such as polyethylene, polypropylene and polyamide. It consists in the fact that the surfaces to be connected are heated on a heated plate to above the melting point and then butt-welded by pressing together. The process has also proven itself well for pipelines made of thermoplastic material. For larger pipes, however, the generation of the required contact pressure when heating the welding surfaces and especially when butt welding the same presents certain difficulties. If the two parts to be welded are coaxial, the contact pressure can be achieved with relatively simple mechanical aids.

   But if it is a question of welding more complicated pipeline parts, the mechanical aids are usually too expensive.



   The present invention relates to a method which allows the problem described to be solved in a simple manner. It consists in the fact that the atmospheric pressure is used for the pressing together of the fused surfaces by evacuating the cavity formed by the two pipeline parts to be welded after all openings have been previously covered as soon as the two welding surfaces have been brought into contact.



   The invention is illustrated by the accompanying drawings:
Fig. 1 shows the mirror welding during the butt welding phase using the example of a T-piece.



   Fig. 2 shows, also using the example of a T-piece, the mirror welding during the heating phase.



   Fig. 1 shows the pressing together of the two T-piece parts 1 'and 1 ", the welding surface 2 of which has previously been heated to above the melting point of the material. Parts 3' and 3" are design variants for covering openings. The third opening of the T-piece rests on the surface 5, which serves as a work surface, with a rubber-elastic, sealing coating 4. The socket 6 is used to evacuate the air content of the molded piece. It goes without saying that instead of the combination 4, 5, 6, a cover, similar to 3 'or 3 ", but with an evacuation opening, could also be used.



   Fig. 2 shows one way of heating up the subsequent welding surfaces. The example is based on the situation in Fig. 1. The heat source is the electrically heated plate 7, which has an opening 7 'so that the pressure on both sides of the plate can equalize when the air content is evacuated through the nozzle 6 shown in Fig. 1 in order to generate contact force. The same effect could of course also be achieved with a continuous heating plate by simultaneously evacuating the two parts to be heated via an opening cover.

   Another possibility of heating is to place the two parts with the end face to be heated on the same side of a heating plate and suck off the respective air content via an opening cover or an opening in the heating plate.



   PATENT CLAIM
Process for mirror welding of thermoplastic pipes and fittings, marked thereby

** WARNING ** End of DESC field could overlap beginning of CLMS **.

Claims (1)

**WARNUNG** Anfang CLMS Feld konnte Ende DESC uberlappen **. ** WARNING ** Beginning of CLMS field could overlap end of DESC **. Verfahren zum Spiegelschweissen thermoplastischer Rohre und Formstücke unter Ausnützung des atmosphärischen Druckes Das Spiegelschweissen ist im Zusammenhang mit gut schweissbaren, thermoplastischen Kunststoffen, wie Polyäthylen, Polypropylen und Polyamid, bekannt. Es besteht darin, dass die zu verbindenden Flächen an einer geheizten Platte bis über den Schmelzpunkt erwärmt und hierauf durch Zusammenpressen stumpfgeschweisst werden. Das Verfahren hat sich unter anderem auch für Rohrleitungen aus thermoplastischem ;Material gut bewährt. Für grössere Rohre bietet jedoch die Erzeugung des erforderlichen Anpressdruckes beim Aufheizen der Schweissflächen und insbesondere beim Stumpfschweissen derselben gewisse Schwierigkeiten. Sofern die beiden zu verschweissenden Teile koaxial sind, lässt sich der Anpressdruck mit relativ einfachen mechanischen Hilfsmitteln realisieren. Process for mirror welding thermoplastic pipes and fittings using atmospheric pressure Mirror welding is known in connection with easily weldable thermoplastics such as polyethylene, polypropylene and polyamide. It consists in the fact that the surfaces to be connected are heated on a heated plate to above the melting point and then butt-welded by pressing together. The process has also proven itself well for pipelines made of thermoplastic material. For larger pipes, however, the generation of the required contact pressure when heating the welding surfaces and especially when butt welding the same presents certain difficulties. If the two parts to be welded are coaxial, the contact pressure can be achieved with relatively simple mechanical aids. Handelt es sich aber um das Verschweissen komplizierterer Rohrleitungsteile, so werden die mechanischen Hilfsmittel meistens zu aufwendig. But if it is a question of welding more complicated pipeline parts, the mechanical aids are usually too expensive. Gegenstand der vorliegenden Erfindung ist ein Verfahren, das das geschilderte Problem auf einfache Art zu lösen erlaubt. Es besteht darin, dass für das Zusammenpressen der angeschmolzenen Flächen der atmosphärische Druck verwertet wird, indem nach vorausgegangenem Abdecken aller Öffnungen der von den beiden zu verschweissenden Rohrleitungsteilen gebildete Hohlraum evakuiert wird, sobald die beiden Schweissflächen miteinander in Berührung gebracht worden sind. The present invention relates to a method which allows the problem described to be solved in a simple manner. It consists in the fact that the atmospheric pressure is used for the pressing together of the fused surfaces by evacuating the cavity formed by the two pipeline parts to be welded after all openings have been previously covered as soon as the two welding surfaces have been brought into contact. Die Erfindung ist durch beiliegende Zeichnungen illustriert: Abb. 1 zeigt das Spiegelschweissen während der Stumpfschweissphase am Beispiel eines T-Stückes. The invention is illustrated by the accompanying drawings: Fig. 1 shows the mirror welding during the butt welding phase using the example of a T-piece. Abb. 2 zeigt, ebenfalls am Beispiel eines T-Stükkes, das Spiegelschweissen während der Aufheizphase. Fig. 2 shows, also using the example of a T-piece, the mirror welding during the heating phase. Abb. 1 stellt das Zusammenpressen der beiden T-Stück-Teile 1' und 1" dar, deren Schweissfläche 2 zuvor bis über den Materialschmelzpunkt erwärmt worden ist. Die Teile 3' und 3" sind Ausführungsvarianten für das Abdecken von Öffnungen. Die dritte Öffnung des T-Stückes ruht auf der als Arbeitsunterlage dienenden Fläche 5 mit gummielastischem, dichtendem Überzug 4. Der Stutzen 6 dient der Evakuation des Luftinhaltes des Formstückes. Es versteht sich, dass anstelle der Kombination 4, 5, 6, auch eine Abdeckung, ähnlich 3' oder 3", jedoch mit Evakuationsöffnung, verwendet werden könnte. Fig. 1 shows the pressing together of the two T-piece parts 1 'and 1 ", the welding surface 2 of which has previously been heated to above the melting point of the material. Parts 3' and 3" are design variants for covering openings. The third opening of the T-piece rests on the surface 5, which serves as a work surface, with a rubber-elastic, sealing coating 4. The socket 6 is used to evacuate the air content of the molded piece. It goes without saying that instead of the combination 4, 5, 6, a cover, similar to 3 'or 3 ", but with an evacuation opening, could also be used. Abb. 2 zeigt eine Möglichkeit des Aufheizens der nachmaligen Schweissflächen. Dem Beispiel ist die Situation von Abb. 1 zugrunde gelegt. Als Wärmequelle dient die elektrisch beheizte Platte 7, die einen Durchbruch 7' aufweist, damit sich der Druck beidseitig der Platte ausgleichen kann, wenn zwecks Erzeugung von Anpresskraft der Luftinhalt über den in Abb. 1 dargestellten Stutzen 6 evakuiert wird. Der gleiche Effekt liesse sich natürlich auch bei einer durchgehenden Heizplatte durch gleichzeitiges Evakuieren über je eine Öffnungsabdeckung der beiden zu erwärmenden Teile erzielen. Fig. 2 shows one way of heating up the subsequent welding surfaces. The example is based on the situation in Fig. 1. The heat source is the electrically heated plate 7, which has an opening 7 'so that the pressure on both sides of the plate can equalize when the air content is evacuated through the nozzle 6 shown in Fig. 1 in order to generate contact force. The same effect could of course also be achieved with a continuous heating plate by simultaneously evacuating the two parts to be heated via an opening cover. Eine weitere Möglichkeit des Erwärmens besteht darin, die beiden Teile mit der zu erhitzenden Stirnfläche auf die gleiche Seite einer Heizplatte zu stellen und den jeweiligen Luftinhalt über eine Öffnungsabdek kung oder je einen Durchbruch der Heizplatte abzusaugen. Another possibility of heating is to place the two parts with the end face to be heated on the same side of a heating plate and suck off the respective air content via an opening cover or an opening in the heating plate. PATENTANSPRUCH Verfahren zum Spiegelschweissen thermoplastischer Rohre und Formstücke, dadurch gekennzeich net, dass für das Zusammenpressen der angeschmolzenen Flächen der atmosphärische Druck verwertet wird, indem nach vorausgegangenem Abdecken aller Öffnungen der von den beiden zu verschweissenden Rohrieitungsteilen gebildete Hohlraum evakuiert wird, sobald die beiden Schweissflächen miteinander in Berührung gebracht worden sind. PATENT CLAIM Process for mirror welding of thermoplastic pipes and fittings, characterized in that the atmospheric pressure is used for the pressing together of the fused surfaces by evacuating the cavity formed by the two pipe parts to be welded as soon as the two welding surfaces come into contact after all openings have been previously covered have been brought. UNTERANSPRÜCHE 1. Verfahren gemäss Patentanspruch, dadurch gekennzeichnet, dass das Ausmass der Evakuation auf die für die Schweissung erforderliche Flächenpressung abgestimmt ist. SUBCLAIMS 1. The method according to claim, characterized in that the extent of the evacuation is matched to the surface pressure required for the welding. 2. Verfahren gemäss Patentanspruch, dadurch gekennzeichnet, dass eine der genannten Öffnungsabdeckungen durch eine als Arbeitsunterlage dienende Fläche mit gummielastischer Oberflächenbeschaffenheit und eingebautem Absaugstutzen gebildet wird. 2. The method according to claim, characterized in that one of said opening covers is formed by a surface serving as a work surface with a rubber-elastic surface finish and a built-in suction nozzle. 3. Verfahren gemäss Patentanspruch, dadurch gekennzeichnet, dass auch für das Anpressen an die Heizplatte beim Erwärmen der Schweissflächen Unterdruck angesetzt wird, wobei der Druck beidseitig der Heizplatte mit Hilfe von Durchbrüchen, die innerhalb der Schweissperipherie angeordnet sind, ausgeglichen werden kann. 3. The method according to claim, characterized in that negative pressure is also applied for pressing against the heating plate when the welding surfaces are heated, the pressure on both sides of the heating plate being able to be compensated for with the aid of openings located within the welding periphery.
CH1168262A 1962-10-04 1962-10-04 Process for mirror welding thermoplastic pipes and fittings using atmospheric pressure CH400547A (en)

Priority Applications (1)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997014548A1 (en) * 1995-10-16 1997-04-24 Bernhard Ulrich Process and device for heat mirror-welding plastic pipe sections
NL1007746C2 (en) * 1997-12-09 1999-06-10 Wavin Bv Mirror welding process for joining together thermoplastic material pipe sections end to end
WO2016144974A1 (en) 2015-03-11 2016-09-15 Morrow Robert J Method of joining pipes and apparatus for facilitating the same

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997014548A1 (en) * 1995-10-16 1997-04-24 Bernhard Ulrich Process and device for heat mirror-welding plastic pipe sections
NL1007746C2 (en) * 1997-12-09 1999-06-10 Wavin Bv Mirror welding process for joining together thermoplastic material pipe sections end to end
WO2016144974A1 (en) 2015-03-11 2016-09-15 Morrow Robert J Method of joining pipes and apparatus for facilitating the same
US20170363243A1 (en) * 2015-03-11 2017-12-21 Robert J. Morrow Method of joining pipes and apparatus for facilitating the same
EP3268652A4 (en) * 2015-03-11 2018-12-05 Robert J. Morrow Method of joining pipes and apparatus for facilitating the same
US10612710B2 (en) 2015-03-11 2020-04-07 Robert J. Morrow Method of joining pipes and apparatus for facilitating the same
AU2016229845B2 (en) * 2015-03-11 2020-10-22 Robert J. Morrow Method of joining pipes and apparatus for facilitating the same
US11339906B2 (en) 2015-03-11 2022-05-24 Robert J. Morrow Method of joining pipes and apparatus for facilitating the same
US11719372B2 (en) 2015-03-11 2023-08-08 Robert J. Morrow Method of joining pipes and apparatus for facilitating the same
US12031657B2 (en) 2015-03-11 2024-07-09 Robert J. Morrow Method of joining pipes and apparatus for facilitating the same
US12523329B2 (en) 2015-03-11 2026-01-13 Robert J. Morrow Method of joining pipes and apparatus for facilitating the same

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