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DE966669C - Heizkeil zum Schweissen von thermoplastischen Kunststoffen - Google Patents

Heizkeil zum Schweissen von thermoplastischen Kunststoffen

Info

Publication number
DE966669C
DE966669C DEZ4394A DEZ0004394A DE966669C DE 966669 C DE966669 C DE 966669C DE Z4394 A DEZ4394 A DE Z4394A DE Z0004394 A DEZ0004394 A DE Z0004394A DE 966669 C DE966669 C DE 966669C
Authority
DE
Germany
Prior art keywords
welding
hot wedge
wedge
thermoplastics
hot
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
DEZ4394A
Other languages
English (en)
Inventor
Dr Guenther Laubmeyer
Dr Marius Smits
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.)
ZEVA ELEK ZITAETSGESELLSCHAFT
Original Assignee
ZEVA ELEK ZITAETSGESELLSCHAFT
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 ZEVA ELEK ZITAETSGESELLSCHAFT filed Critical ZEVA ELEK ZITAETSGESELLSCHAFT
Priority to DEZ4394A priority Critical patent/DE966669C/de
Application granted granted Critical
Publication of DE966669C publication Critical patent/DE966669C/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
    • B29C65/18—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
    • B29C66/70—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
    • B29C66/81—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
    • B29C66/812—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 characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/8122—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 characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the composition of the material constituting the pressing elements, e.g. constituting 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
    • B29C66/81—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
    • B29C66/812—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 characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/8126—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 characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/81261—Thermal properties, e.g. thermal conductivity, thermal expansion coefficient
    • 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
    • B29C66/818—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 characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps
    • B29C66/8183—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 characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the thermal conducting constructional aspects
    • B29C66/81831—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 characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the thermal conducting constructional aspects of the welding jaws
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C9/00—Alloys based on copper

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Description

  • Heizkeil zum Schweißen von thermoplastischen Kunststoffen Die Erfindung bezieht sich auf einen Heizkeil zum Schweißen von thermoplastischen Kunststoffen.
  • Mit der Entwicklung der thermoplastischen Kunststoffe kamen verschiedene Verfahren auf, um zwei derartige Stoffe an den miteinander zu verbindenden Fläche. unter Wärmeeinwirkung im weichplastischen Zustand zu verschweißen.
  • Zu diesem Zweck führt man einen Heizkeil, der eine der jeweiligen Schweißarbeit angepaßte messer- oder keilartige Form besitzt, zwischen die beiden zu verschweißenden Stoffe ein, so daß diese unter dem Einfluß der Wärme plastisch werden.
  • In diesem Zustand, der nur kurze Zeit anhält, werden die Stoffe mechanisch zusammengepreßt. Damit ist dann die Schweißung vollzogen.
  • Da die thermoplastischen Stoffe vielfach organische Chlorwasserstoffverbindungen darstellen, entstehen beim Schweißen Zersetzungsprodukte, die stark chlorwasserstoffhaltig sind und die Heizkeile sehr schnell angreifen, ganz gleich, ob es sich um Handwerkzeuge oder Teile von Schweißmaschinen handelt. Es wird daher als sehr lästig empfunden, daß diese Heizkeile nach kurzer 5 chweiß dauer wieder zugerichtet oder nachgeformt werden müssen. Diese häufig notwendig werdende Arbeit stört den gleichmäßigen Ablauf des Schweißens und verteuert diese erheblich. Es hat nicht an Versuchen gefehlt, diesem Übelstand abzuhelfen.
  • Man hat Versuche mit Legierungen, z. B. Messing, Tombak, Cu-Al, Bronze usw., durchgeführt. die besonderes beständig gegen die Zersetzungs- produkte der Kunststoffe sind. Diese Legierungen haben aber alle den Nachteil, daß ihre Wärmeleitfähigkeit klein ist und dadurch nur eine geringe Schweiß leistung erreicht werden kann.
  • Mit Heizkeilen aus Kupfer, aber auch aus Silber, fst die Schweileistung am besten, und man hat viele Versuche gemacht, um durch geeignete galvanische Oberflächenveredelung, wie Vernicklung, Verchromung, Cadmieren usw., eine Verbesserung der Haltbarkeit zu erzielen. Alle diese Versuche brachten nur kleine Teilerfolge, die aber zeitlich nur geringe Wirkung hatten.
  • Die demgegenüber fortschrittliche Lösung dieser Aufgabe besteht gemäß der Erfindung darin, daß der Heizkeil aus einer Legierung eines gut wärmeleitenden Metalls mit einem Erdalkalimetall aus der II. Gruppe des Periodischen Systems, z. B.
  • Beryllium, besteht. Eine solche Legierung bildet nach einer entsprechenden Wärmebehandlung an der Oberfläche des Heizkeiles eine dünne festhaftende Oxydhaut mit einer besonderen Widerstandsfestigkeit gegen die Einwirkung der Zersetzungsprodukte des Kunststoffes beim Schweißen.
  • Als Ausführungsbeispiel wird ein Heizkeil aus Kupfer mit einem geringen Berylliumzusatz genannt. DieseLegierung scheidet nach einer Wärmebehandlung an der Oberfläche eine dünne Haut von Kupfer-Beryllium-Oxyd aus, das außerordentlich festhaftet und durch seinen höheren Berylliumoxydanteil chemisch - selbst bei höherer Temperatur - von Chlorwasserstöffverbindungen so gut wie nicht angegriffen wird. Diese sehr dünne Oxydhaut, die sich bei gelegentlichen Verletzungen schnell neu bildet, bietet für den Wärmeübergang fast kein Hindernis, so daß die gute Wärmeleitfähigkeit des Kupfer-Berylliums praktisch völlig ungehemmt zur Auswirkung kommt.
  • Praktische Versuche haben gezeigt, daß Heizkeile nach der Erfindung eine Haltbarkeit bei der Kunststoffschwefßung aufweisen, die um 30- bis 50mal größer ist als diejenige von Heizkeilen aus Kupfer, selbst wenn diese besonders gut oberflächenveredelt sind.
  • Ähnliche Wirkungen sind z. B. mit Legierungen von Kupfer mit Magnesium zu erzielen.

Claims (1)

  1. ! PATENTANSPRUCH: Heizkeil zum Schweißen von thermoplastischen Kunststoffen, dadurch gekennzeichnet, daß er aus einer Legierung eines gut wärmeleitenden Metalls mit einem Erdalkalimetall aus der II. Gruppe des Periodischen Systems, z. B. Beryllium, besteht.
    In Betracht gezogene Druckschriften: Zeitschrift »Wertkstoffe und Korrosion«, Jahrgang I950, Heft 12, S. 493.
DEZ4394A 1954-09-01 1954-09-01 Heizkeil zum Schweissen von thermoplastischen Kunststoffen Expired DE966669C (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEZ4394A DE966669C (de) 1954-09-01 1954-09-01 Heizkeil zum Schweissen von thermoplastischen Kunststoffen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEZ4394A DE966669C (de) 1954-09-01 1954-09-01 Heizkeil zum Schweissen von thermoplastischen Kunststoffen

Publications (1)

Publication Number Publication Date
DE966669C true DE966669C (de) 1957-08-29

Family

ID=7619119

Family Applications (1)

Application Number Title Priority Date Filing Date
DEZ4394A Expired DE966669C (de) 1954-09-01 1954-09-01 Heizkeil zum Schweissen von thermoplastischen Kunststoffen

Country Status (1)

Country Link
DE (1) DE966669C (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1192813B (de) * 1961-06-08 1965-05-13 Funck Kg Dr Ing Verfahren zum Verschweissen von thermoplastischen Kunststoffen
DE102006016695A1 (de) * 2006-04-08 2007-10-11 Leister Process Technologies Elektrisches Heizelement

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1192813B (de) * 1961-06-08 1965-05-13 Funck Kg Dr Ing Verfahren zum Verschweissen von thermoplastischen Kunststoffen
DE102006016695A1 (de) * 2006-04-08 2007-10-11 Leister Process Technologies Elektrisches Heizelement

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