DD243893A1 - PROCESS FOR WELDING POLYTETRAFLOURETHYLENE - Google Patents

PROCESS FOR WELDING POLYTETRAFLOURETHYLENE Download PDF

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Publication number
DD243893A1
DD243893A1 DD85283743A DD28374385A DD243893A1 DD 243893 A1 DD243893 A1 DD 243893A1 DD 85283743 A DD85283743 A DD 85283743A DD 28374385 A DD28374385 A DD 28374385A DD 243893 A1 DD243893 A1 DD 243893A1
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DD
German Democratic Republic
Prior art keywords
temperature
welding
cooling
melting point
phase
Prior art date
Application number
DD85283743A
Other languages
German (de)
Inventor
Wilhelm Bader
Peter Schoene
Original Assignee
Zentralinstitut Schweiss
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 Zentralinstitut Schweiss filed Critical Zentralinstitut Schweiss
Priority to DD85283743A priority Critical patent/DD243893A1/en
Publication of DD243893A1 publication Critical patent/DD243893A1/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
    • B29C66/70—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
    • 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
    • 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
    • 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
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
    • B29C66/91411—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature of the parts to be joined, e.g. the joining process taking the temperature of the parts to be joined into account
    • 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
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
    • B29C66/91421—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature of the joining tools
    • 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
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
    • B29C66/91441—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature the temperature being non-constant over time
    • B29C66/91443—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature the temperature being non-constant over time following a temperature-time profile
    • 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
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
    • B29C66/91441—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature the temperature being non-constant over time
    • B29C66/91443—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature the temperature being non-constant over time following a temperature-time profile
    • B29C66/91445—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature the temperature being non-constant over time following a temperature-time profile by steps

Abstract

Um insbesondere Stumpf- oder Ueberlappverbindungen an Tafelmaterial zu erhalten, ist es Aufgabe der Erfindung, mittels geeigneter Zeit-Temperatur-Zyklen Nahtfestigkeiten nahe der Grundwerkstoffestigkeit zu schaffen. Erfindungsgemaess erfolgt nach einer Fuegedruck aufbauenden Anwaermphase eine Abkuehlphase bis zum Erreichen des Kristallitschmelzpunktes sowie eine im Kristallitschmelzpunkt konstant zu haltende Verweilzeit und danach eine Abkuehlphase zum Erreichen einer Rekristallisation und eine weitere Abkuehlphase mittels Schockkuehlung auf Raumtemperatur. Vorzugsweise findet diese erfindungsgemaesse Loesung Anwendung fuer die Behaelterauskleidung in der chemischen Industrie.In order to obtain in particular butt or overlap joints on sheet material, it is an object of the invention to provide by means of suitable time-temperature cycles seam strengths near the base material strength. According to the invention, a quenching phase takes place after a quenching pressure builds up until the crystallite melting point is reached, and a residence time to be kept constant in the crystallite melting point, and then a quenching phase to achieve recrystallization and a further quenching phase by means of shock cooling to room temperature. Preferably, this invention solution finds application for the container lining in the chemical industry.

Description

Anwendungsgebiet der Erfindung iField of application of the invention i

Die Erfindung betrifft ein Verfahren zum Schweißen von Polytetrafluorethylen (PTFE), um insbesondere Stumpf- oder Überlappverbindungen an Tafelmaterial, wie z. B. für die Behälterauskleidung in der chemischen Industrie, ausführen zu können.The invention relates to a method for welding polytetrafluoroethylene (PTFE), in particular butt or overlap joints of sheet material such. As for the container lining in the chemical industry to perform.

Charakteristik der bekannten technischen LösungenCharacteristic of the known technical solutions

Es ist bekannt, daß für das Schweißen von PTFE die große Ausdehnung oberhalb des Kristallitschmelzpunktes bei entsprechender Fixierung der Fügepartner zur Realisierung des Schweißdruckes ausgenufzt wird (DD-PS 121740). Für Folien aus diesem Werkstoff erfolgt der Schweißvorgang durch Erwärmen und rasches Abkühlen.It is known that for the welding of PTFE, the large expansion above the crystallite melting point with appropriate fixation of the joining partners for the realization of the welding pressure is exhausted (DD-PS 121740). For films made of this material, the welding process is carried out by heating and rapid cooling.

Auf Grund der geringen Wärmeleitung ist diese Technologie für Tafelmaterial nicht anwendbar.Due to the low thermal conductivity, this technology is not applicable to board material.

Ziel der ErfindungObject of the invention

Es ist Ziel der Erfindung, einen optimal technologischen Vorgang zum Schweißen von PTFE-Tafelmaterial zu schaffen.It is an object of the invention to provide an optimally technological process for welding PTFE sheet material.

Wesen der ErfindungEssence of the invention

Der Erfindung liegt die Aufgabe zugrunde, durch geeignete Zeit-Temperatur-Zyklen mit Nahtfestigkeiten nahe der Grundwerkstoffestigkeit in Stumpf- oder Überlappverbindung zu fügen.The invention has for its object to add by suitable time-temperature cycles with seam strengths near the base material strength in butt or overlap.

Erfindungsgemäß wird die Aufgabe dadurch gelöst, daß der Füge- und Abkühlvorgang in vorzugsweise fünf Temperatur-, und Zeitphasen erfolgt. Nach einer Anwärmphase, in welcher sich der Fügedruck aufbaut, folgt eine erste Abkühlphase bis zum Erreichen des Kristallitschmelzpunktes. Anschließend erfolgt ein Konstanthalten zur Rekrisfallisierung des Nahtbereiches, um eine hohe Festigkeit zu erhalten. Zur Unterstützung,dieses Prozesses wird die nächste Abkühlphase mit flachem Temperaturgefälle von durchgeführt. Nach Erreichen der Einsatztemperaturgrenzen von PTFE erfolgt eine Schockkühlung auf Raumtemperatur.According to the invention the object is achieved in that the joining and cooling process takes place in preferably five temperature and time phases. After a warm-up phase in which the joining pressure builds up, a first cooling phase follows until the crystallite melting point is reached. Subsequently, a constant is held to Rekrisfallisierung the seam area in order to obtain a high strength. In support of this process, the next cooling phase is carried out with a flat temperature gradient of. After reaching the operating temperature limits of PTFE, shock cooling takes place to room temperature.

AusführungsbeispieiAusführungsbeispiei

Das Schweißverfahren soll an einer4mm dicken Stumpfnaht näher erläutert werden.The welding process will be explained in more detail on a 4mm thick butt weld.

Die Fügeteile werden in die Schweißanlage, die nach dem Wärmekontaktschweißverfahren konzipiert ist, eingelegt. Die Schweißelemente besitzen eine Temperatur von 420°C. Nach 5 Minuten hat der genannte Nahtbereich dieser Temperatur angenommen. DieTemperatur der Heizelemente wird in der Weise abgesenkt, daß nach 7,5 Minuten eine Temperatur von 327°C erreicht ist. Diese Temperatur wird 5 Minuten konstant gehalten. Die folgende Abkühlung erfolgt in 10 Minuten auf 250°C. Anschließend werden die Heizelemente in geeigneter Weise — z. B. gerichteter Luftstrom —i auf Raumtemperatur abgekühlt. Nach dieser Technologie werden Schweißnahtfestigkeiten erreicht, die 90% der Grundwerkstoffestigkeit betragen.The parts to be joined are inserted into the welding system, which is designed according to the thermal contact welding method. The welding elements have a temperature of 420 ° C. After 5 minutes, said seam area has assumed this temperature. The temperature of the heating elements is lowered in such a way that after 7.5 minutes a temperature of 327 ° C is reached. This temperature is kept constant for 5 minutes. The following cooling takes place in 10 minutes at 250 ° C. Subsequently, the heating elements in a suitable manner -. B. directed air flow -i cooled to room temperature. This technology achieves weld strengths that are 90% of the base material strength.

Claims (1)

Erfindungsanspruch:Invention claim: Verfahren zum Schweißen von Polytetraflourethylen, um vorzugsweise Tafelmaterial durch geeignete Zeit-Temperatur-Zyklen mit Nahtfestigkeiten nahe der G rund werkstoff estig keit in Stumpf-oder Überlappverbindung zu fügen, gekennzeichnet dadurch, daß nach einer aufbauenden Anwärmphase eine Abkühlphase bis zum Erreichen des Kristallitschmelzpunktes sowie eine im Kristallitschmelzpunkt konstant zu haltende Verweilzeit und danach eine Abkühlphase zum Erreichen einer Rekristallisation und eine weitere Abkühlphase mittels Schockkühlung auf Raumtemperatur erfolgt.A method for welding polytetrafluoroethylene, preferably to add sheet material by means of suitable time-temperature cycles with seam strengths near the round material in a butt or lap joint, characterized in that after a build-up warm-up phase a cooling phase until reaching the crystallite melting point and a residence time to be kept constant in the crystallite melting point and then a cooling phase to achieve recrystallization and a further cooling phase by means of shock cooling to room temperature. Anwendungsgebiet der ErfindungField of application of the invention Die Erfindung betrifft ein Verfahren zum Schweißen von Polytetrafluorethylen (PTFE), um insbesondere Stumpf- oder Überlappverbindungen an Tafelmaterial, wie z. B. für die Behälterauskleidung in der chemischen Industrie, ausführen zu können.The invention relates to a method for welding polytetrafluoroethylene (PTFE), in particular butt or overlap joints of sheet material such. As for the container lining in the chemical industry to perform. Charakteristik der bekannten technischen LösungenCharacteristic of the known technical solutions Es ist bekannt, daß für das Schweißen von PTFE die große Ausdehnung oberhalb des Kristallitschmelzpunktes bei entsprechender Fixierung der Fügepartner zur Realisierung des Schweißdruckes ausgenutzt wird (DD-PS 121740). Für Folien aus diesem Werkstoff erfolgt der Schweißvorgang durch Erwärmen und rasches Abkühlen. Auf Grund der geringen Wärmeleitung ist diese Technologie für Tafelmaterial nicht anwendbar.It is known that for the welding of PTFE, the large expansion above the crystallite melting point is exploited with appropriate fixation of the joining partners to realize the welding pressure (DD-PS 121740). For films made of this material, the welding process is carried out by heating and rapid cooling. Due to the low thermal conductivity, this technology is not applicable to board material. Ziel der Erfindung .Object of the invention. Es ist Ziel der Erfindung, einen optimal technologischen Vorgang zum Schweißen von PTFE-Tafelmaterial zu schaffen.It is an object of the invention to provide an optimally technological process for welding PTFE sheet material. Wesen der ErfindungEssence of the invention Der Erfindung liegt die Aufgabe zugrunde, durch geeignete Zeit-Temperatur^Zyklen mit Nahtfestigkeiten nahe der Grundwerkstoffestigkeit in Stumpf- oder Überlappverbindung zu fügen.The invention has for its object to add by suitable time-temperature ^ cycles with seam strengths close to the base material strength in butt or lap joint. Erfindungsgemäß wird die Aufgabe dadurch gelöst, daß der Füge- und Abkühlvorgang in vorzugsweise fünf Temperatur-und Zeitphasen erfolgt. Nach einer Anwärmphase, in welcher sich der Fügedruck aufbaut, folgt eine erste Abkühl phase bis zum Erreichen des Kristallitschmelzpunktes. Anschließend erfolgt ein Konstanthalten zur Rekrisfallisierung des Nahtbereiches, um eine hohe Festigkeit zu erhalten. Zur Unterstützung dieses Prozesses wird die nächste Abkühlphase mit flachem Temperaturgefälle von durchgeführt. Nach Erreichen der Einsatztemperaturgrenzen von PTFE erfolgt eine Schockkühlung auf Raumtemperatur.According to the invention the object is achieved in that the joining and cooling process takes place in preferably five temperature and time phases. After a warm-up phase, in which builds the joining pressure, followed by a first cooling phase until reaching the crystallite melting point. Subsequently, a constant is held to Rekrisfallisierung the seam area in order to obtain a high strength. In support of this process, the next cooling phase is carried out with a flat temperature gradient of. After reaching the operating temperature limits of PTFE, shock cooling takes place to room temperature. Ausführungsbeispiel embodiment Das Schweißverfahren soll an einer 4 mm dicken Stumpfnaht näher erläutert werden. Die Fügeteile werden in die Schweißanlage, die nach dem Wärmekontaktschweißverfahren konzipiert ist, eingelegt. Die Schweißelemente besitzen eine Temperatur von 420°C. Nach 5 Minuten hat der genannte Nahtbereich dieser Temperatur angenommen. Die Temperatur der Heizelemente wird in der Weise abgesenkt, daß nach 7,5 Minuten eine Temperatur von 3270C erreicht ist. Diese Temperatur wird 5 Minuten konstant gehalten. Die folgende Abkühlung erfolgt in 10 Minuten auf 2500C. Anschließend werden die Heizelemente in geeigneter Weise — z. B. gerichteter Luftstrom —. auf Raumtemperatur abgekühlt. Nach dieser Technologie werden Schweißnahtfestigkeiten erreicht, die 90% der Grundwerkstoffestigkeit betragen.The welding process will be explained in more detail on a 4 mm thick butt weld. The parts to be joined are inserted into the welding system, which is designed according to the thermal contact welding method. The welding elements have a temperature of 420 ° C. After 5 minutes, said seam area has assumed this temperature. The temperature of the heating elements is lowered in such a way that after 7.5 minutes, a temperature of 327 0 C is reached. This temperature is kept constant for 5 minutes. The following cooling takes place in 10 minutes to 250 0 C. Then the heating elements in a suitable manner -. B. directed air flow -. cooled to room temperature. This technology achieves weld strengths that are 90% of the base material strength.
DD85283743A 1985-12-04 1985-12-04 PROCESS FOR WELDING POLYTETRAFLOURETHYLENE DD243893A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DD85283743A DD243893A1 (en) 1985-12-04 1985-12-04 PROCESS FOR WELDING POLYTETRAFLOURETHYLENE

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DD85283743A DD243893A1 (en) 1985-12-04 1985-12-04 PROCESS FOR WELDING POLYTETRAFLOURETHYLENE

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DD243893A1 true DD243893A1 (en) 1987-03-18

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999037467A1 (en) * 1998-01-20 1999-07-29 Single Buoy Moorings Inc. Method of welding generally rod-shaped structures of a fluorine-containing plastic material in a butt weld
WO2003028982A1 (en) * 2001-09-24 2003-04-10 Oce Printing Systems Gmbh Method and device for producing an intermediate supporting strip by welding and involving a subsequent heat treatment

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999037467A1 (en) * 1998-01-20 1999-07-29 Single Buoy Moorings Inc. Method of welding generally rod-shaped structures of a fluorine-containing plastic material in a butt weld
WO2003028982A1 (en) * 2001-09-24 2003-04-10 Oce Printing Systems Gmbh Method and device for producing an intermediate supporting strip by welding and involving a subsequent heat treatment

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