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DE1184486B - Heating element for welding thermoplastics using heat pulse processing - Google Patents

Heating element for welding thermoplastics using heat pulse processing

Info

Publication number
DE1184486B
DE1184486B DEN18715A DEN0018715A DE1184486B DE 1184486 B DE1184486 B DE 1184486B DE N18715 A DEN18715 A DE N18715A DE N0018715 A DEN0018715 A DE N0018715A DE 1184486 B DE1184486 B DE 1184486B
Authority
DE
Germany
Prior art keywords
heating conductor
heating
heating element
conductor
element according
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.)
Pending
Application number
DEN18715A
Other languages
German (de)
Inventor
Eugenie Nittel Geb Krause
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.)
EUGENIE NITTEL GEB KRAUSE
Original Assignee
EUGENIE NITTEL GEB KRAUSE
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 EUGENIE NITTEL GEB KRAUSE filed Critical EUGENIE NITTEL GEB KRAUSE
Priority to DEN18715A priority Critical patent/DE1184486B/en
Publication of DE1184486B publication Critical patent/DE1184486B/en
Pending 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
    • B29C65/22—Heated wire resistive ribbon, resistive band or resistive strip
    • B29C65/221—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip
    • B29C65/224—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip being a resistive ribbon, a resistive band or a resistive strip
    • 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
    • B29C65/22—Heated wire resistive ribbon, resistive band or resistive strip
    • B29C65/228—Heated wire resistive ribbon, resistive band or resistive strip characterised by the means for electrically connecting the ends of said heated wire, resistive ribbon, resistive band or resistive strip
    • 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
    • B29C65/38—Impulse heating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/24—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight
    • B29C66/242—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours
    • B29C66/2422—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being circular, oval or elliptical
    • B29C66/24221—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being circular, oval or elliptical being circular
    • 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
    • B29C66/818—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
    • 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
    • B29C66/8187—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 electrical insulating constructional aspects
    • B29C66/81871—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 electrical insulating constructional aspects of the welding jaws
    • 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
    • B29C66/004—Preventing sticking together, e.g. of some areas of the parts to be joined
    • B29C66/0042—Preventing sticking together, e.g. of some areas of the parts to be joined of the joining tool and the parts to be joined
    • B29C66/0044—Preventing sticking together, e.g. of some areas of the parts to be joined of the joining tool and the parts to be joined using a separating sheet, e.g. fixed on the joining tool
    • 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
    • B29C66/8181—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 cooling constructional aspects
    • B29C66/81811—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 cooling constructional aspects of the welding jaws

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Surface Heating Bodies (AREA)

Description

Heizelement zum Verschweißen von thermoplastischen Kunststoffen im Wärmeimpulsverfahren Die Erfindung bezieht sich auf ein Heizelement zum Verschweißen von thermoplastischen Kunststoffen im Wärmeimpulsverfahren.Heating element for welding thermoplastics in Thermal pulse method The invention relates to a heating element for welding of thermoplastics in the heat impulse process.

Es ist bekannt, derartigen Heizelementen die Gestalt eines endlos geformten Heizleiters zu geben, um beispielsweise kreisförmige Schweißnähte zu erzeugen. In der Praxis zeigten sich dabei jedoch große Schwierigkeiten, den Heizleiter gleichmäßig zu erwärmen. Man leitete daher den Strom über mehrere Stromanschlüsse in den Heizleiter. Alle diese Maßnahmen waren jedoch nicht zufriedenstellend. Es zeigte sich immer wieder, daß an den Einspeisungsstellen des Stromes keine einwandfreien Nähte, z. B. undichte Stellen, entstehen. Die Ursachen hierfür waren Querschnittsänderungen an den Einspeisungsstellen, die zu unterschiedlichen Erwärmungen, sei es zu sogenannten »kalten Zonen« oder in manchen Fällen sogar zu überhitzten Stellen führten. Auch ergaben sich Schwierigkeiten an den Einspeisungsstellen durch die ungleichmäßige Wärmeableitung. It is known that such heating elements take the form of an endless to give shaped heating conductor, for example to produce circular weld seams. In practice, however, there were great difficulties in keeping the heating conductor evenly to warm up. The current was therefore directed into the heating conductor via several power connections. However, all of these measures were unsatisfactory. It always showed again that there are no flawless seams at the feed points of the current, e.g. B. leaks arise. The reasons for this were cross-sectional changes at the feed points, which lead to different warming, be it to so-called "Cold zones" or, in some cases, even overheated areas. Even difficulties arose at the feed points due to the uneven Heat dissipation.

Diese Schwierigkeiten konnten zum Teil durch ein Verfahren abgemildert werden, bei dem der elektrische Heizleiter über verschiedene Stromzufuhrstellen in zwei sich teilweise überdeckende Stromkreise unterteilt wird. Durch besondere Schaltvorrichtungen wird hierbei eine solche zeitliche Staffelung der Stromimpulse vorgenommen, daß von den beiden sich überdeckenden Stromkreisen jeweils nur einer angeschlossen ist. Mit anderen Worten, man suchte durch Vorheizen des Heizleiters die kalten Zonen der Einspeisungsstellen des einen Stromkreises und anschließend durch einen weiteren Heizimpuls die kalten Zonen der Einspeisungsstellen des anderen Stromkreises zu vermeiden. Dieses Verfahren hat jedoch nicht nur den Nachteil, daß die Schaltvorrichtungen teuer und aufwendig sind; ein Hauptnachteil besteht vielmehr darin, daß auch mit diesem Verfahren noch keine allen Anforderungen gerecht werdende Qualität der Schweißnähte erzielt werden kann. Die Schweißnähte werden bei Anwendung dieses Verfahrens nach wie vor ungleichmäßig erwärmt, wodurch Festigkeitsunterschiede entlang der Naht nicht zu vermeiden sind. Some of these difficulties were alleviated by a procedure in which the electrical heating conductor has various power supply points is divided into two partially overlapping circuits. By special Switching devices is such a time staggering of the current pulses made that of the two overlapping circuits only one connected. In other words, you searched by preheating the heating conductor the cold zones of the feed points of one circuit and then by means of a further heating pulse, the cold zones of the feed points of the other Circuit to avoid. However, this method not only has the disadvantage that the switching devices are expensive and complex; rather, there is a major disadvantage in the fact that this process does not yet meet all requirements Quality of the welds can be achieved. The welds are made when applying this process still heated unevenly, creating differences in strength along the seam cannot be avoided.

Die Aufgabe der Erfindung besteht darin, ein Heizelement zu schaffen, das nur wenige Stromanschlüsse hat und ohne teure Schaltvorrichtungen dennoch absolut gleichmäßige Schweißnähte liefert, deren Festigkeit nicht geringer ist als diejenige der benachbarten nicht erwärmten Kunststoffteile. The object of the invention is to create a heating element, that has only a few power connections and still absolutely without expensive switching devices provides uniform weld seams, the strength of which is no less than that the neighboring unheated plastic parts.

Nach der Erfindung werden an einem Heizleiter zwei gegenüberliegende Stromanschlüsse vorgesehen, von denen jeder zwei beiderseits des Heizleiters un- mittelbar schräg gegenüberliegend zueinander angeordnete Einspeisungsstellen aufweist, so daß sich zwei nahtlos aneinandergereihte Heizleiterhälften ergeben, wobei sowohl der Heizleiter als auch die Stromanschlüsse einstückig hergestellt sind. According to the invention, two opposing heaters are attached to a heating conductor Power connections are provided, each of which has two on both sides of the heating conductor and indirectly has feed points arranged diagonally opposite one another, so that there are two seamlessly lined up heating conductor halves, with both the heating conductor and the power connections are made in one piece.

Durch diese Maßnahme ergeben sich praktisch zwei aneinandergereihte, beispielsweise halbkreisförmige Heizleiter. Die oben geschilderten Probleme an den Einspeisungsstellen des Stromes sind durch die Erfindung restlos gelöst. Die Einspeisungsstellen sind noch nicht einmal mehr am geschweißten Stück erkennbar, was als äußeres Zeichen der absolut gleichmäßigen Güte der Schweißnaht angesehen werden kann. This measure practically results in two lined up, for example, semicircular heating conductors. The problems with the Feeding points of the electricity are completely solved by the invention. The feeding points are no longer even recognizable on the welded piece, which is an external sign the absolutely uniform quality of the weld seam can be seen.

Nach einem weiteren wesentlichen Merkmal der Erfindung wird der Heizleiter aus einem Stück Blech hergestellt, z. B. ausgesägt. Die Stromanschlüsse, die vorzugsweise ebenfalls aus dem Blech mit ausgesägt werden, sind gekröpft angeordnet. Durch diese Maßnahmen werden die Nachteile ungünstiger Wärmeableitung und Ungleichmäßigkeiten der Schweißnaht restlos vermieden. According to a further essential feature of the invention, the heating conductor made from a piece of sheet metal, e.g. B. sawn out. The power connections that are preferred are also sawn out of the sheet metal, are arranged cranked. Through this Measures will address the disadvantages of unfavorable heat dissipation and unevenness the weld seam completely avoided.

Durch das Aussägen des Heizleiters aus einem Stück Blech läßt sich jede beliebige, auch eckige und spitze Form eines geschlossenen Heizleiters erzielen. So hergestellte Heizleiter haben eine besonders lange Lebensdauer. Selbstverständlich kann man auch Heizleiter aus einzelnen etwa geradlinigen Stücken zusammenlöten, wenn keine allzu großen Anforderungen an die gleichmäßige Güte entlang jeder Schweißnaht gestellt werden. By sawing out the heating conductor from a piece of sheet metal, achieve any desired, even angular and pointed shape of a closed heating conductor. Heat conductors manufactured in this way have a particularly long service life. Of course you can also solder together heating conductors from individual, roughly straight-line pieces, if the requirements for uniform quality along every weld seam are not too great be asked.

Weitere Merkmale und Einzelheiten der Erfindung ergeben sich aus der folgenden Beschreibung eines Ausführungsbeispieles. In der Zeichnung stellt dar Fig. 1 den Grundriß eines Heizelementes nach der Erfindung, F i g. 2 einen Schnitt entlang Linie 2-2 in Fig. 1, F i g. 3 den Querschnitt durch einen Teil eines Druckstempels einer Wärmeimpuls-Schweißmaschine. Further features and details of the invention emerge from the following description of an embodiment. In the drawing represents Fig. 1 shows the plan of a heating element according to the invention, F. i g. 2 shows a section along line 2-2 in FIG. 1, FIG. 3 the cross section through part of a pressure ram of a heat pulse welding machine.

Der Heizleiter 10 nach Fig. 1 besitzt zwei gegenüberliegende Stromanschlüsse 11, 12. Jeder Stromanschluß besteht aus zwei beiderseits des Heizleiters angeordneten Einspeisungsstellen 11 a, 11 i; 12 a, 12 i. The heating conductor 10 according to FIG. 1 has two opposite power connections 11, 12. Each power connection consists of two arranged on both sides of the heating conductor Feed points 11 a, 11 i; 12 a, 12 i.

Sie sind unmittelbar schräg gegenüberliegend angeordnet, so daß sich zwei nahtlos aneinandergereihte Heizleiterhälften 10', 10" ergeben. Der Materialquerschnitt jeder Einspeisungsstelle 11a, 11i; 12a, 12i am unmittelbaren Übergang zum Heizleiter 10 entspricht dabei demjenigen des Heizleiters 10. Alle Einspeisungsstellen bestehen zusammen mit dem Heizleiter 10 aus einem Stück.They are arranged directly opposite one another, so that result in two heating conductor halves 10 ', 10 "lined up seamlessly. The material cross-section each feed point 11a, 11i; 12a, 12i at the immediate transition to the heating conductor 10 corresponds to that of heating conductor 10. All feed points exist together with the heating conductor 10 in one piece.

Wie F i g. 2 zeigt, sind die Stromanschlüsse 11, 12 zweifach abgekröpft, wodurch die dem Werkstoff zugewandte Unterseite des Heizleiters 10 auch an diesen Stellen beibehalten ist. Die Löcher 13 dienen zum Anschluß der nicht dargestellten Stromkabel. Like F i g. 2 shows, the power connections 11, 12 are bent twice, whereby the underside of the heating conductor 10 facing the material is also attached to this Bodies is retained. The holes 13 are used to connect the not shown Power cord.

Die Unterseite des Heizleiters ist ballig ausgebildet.The underside of the heating conductor is convex.

Mindestens aber sind die Kanten abgerundet, so daß sich beiderseits der Schweißnaht Übergangszonen ausbilden, die der Festigkeit der Nähte zugute kommen.At least the edges are rounded, so that both sides of the weld seam form transition zones that benefit the strength of the seams.

Als Material für den Heizleiter 10 kommt ein besonders korrosions- und wärmebeständiges Material in Frage, z. B. ein niedriggekohlter Chrom-Nickel-Stahl. The material used for the heating conductor 10 is a particularly corrosion-resistant and heat resistant material in question, e.g. B. a low-carbon chrome-nickel steel.

Der Druckstempel nach Fig. 3 besteht aus einer Unterlage 14 für den Heizleiter 10. Die Unterlage kann von einem Kühlmittel, z. B. Wasser oder Luft, durchflossen sein. Die Außenseite der Unterlage 14 ist mittels einer Schicht 15 isoliert. Ferner ist eine Umhüllung 16 vorgesehen. Zwischen der Schicht 15 und der Umhüllung 16 befindet sich der Heizleiter 10. Durch diese Anordnung kann sich der Heizleiter 10 trotz seiner erheblichen Wärmedehnungen frei verschieben. Auch für die Umhüllung 16 ist ein hoch wärmebeständiges Material erforderlich. Es wird ein Glasgewebe empfohlen, das mit einem polymeren halogenierten Kohlenwasserstoff getränkt wurde. Mit 17, 18 sind Spannringe bezeichnet, die zur bequemen Befestigung an einem nicht dargestellten Stößel einer Schweißmaschine dienen. The plunger according to FIG. 3 consists of a pad 14 for the Heating conductor 10. The pad can be of a coolant, e.g. B. water or air, be flowed through. The outside of the base 14 is covered by a layer 15 isolated. A casing 16 is also provided. Between the layer 15 and the Sheath 16 is the heating conductor 10. This arrangement allows the Move heating conductor 10 freely despite its considerable thermal expansion. Also for the sheath 16 is required to be a highly heat-resistant material. It will be a Recommended glass fabric impregnated with a polymeric halogenated hydrocarbon became. With 17, 18 clamping rings are designated, which are convenient for Attachment to a not shown serve a ram of a welding machine.

Claims (6)

Patentansprüche: 1. Heizelement zum Verschweißen von thenaclr plastischen Kunststoffen im Wärmeimpulsverfahren mittels eines endlos geformten, bandförmigen Heizleiters, der mehrere Stromanschlüsse aufweist, dadurch gekennzeichnet, daß zwei gegenüberliegende Stromanschlüsse (11, 12) vorgesehen sind, von denen jeder aus zwei beiderseits des Heizleiters (10) unmittelbar schräg gegenüberliegend zueinander angeordnete Einspeisungsstellen (11 a, 11 i; 12 a, 12 i) aufweist, so daß sich zwei nahtlos aneinandergereihte Heizleiterhälften (10', 10") ergeben, wobei sb wohl der Heizleiter (10) als auch die Stromanschlüsse einstückig hergestellt sind. Claims: 1. Heating element for welding thenaclr plastic Plastics in the heat impulse process by means of an endlessly shaped, belt-shaped Heating conductor which has several power connections, characterized in that two opposing power connections (11, 12) are provided, each of which consists of two on both sides of the heating conductor (10) directly opposite one another at an angle arranged feed points (11 a, 11 i; 12 a, 12 i), so that two Seamlessly lined up heating conductor halves (10 ', 10 ") result, with sb probably the The heating conductor (10) and the power connections are made in one piece. 2. Heizelement nach Anspruch 1, dadurch gekennzeichnet, daß der Heizleiter (10) aus einem Stück Blech hergestellt ist. 2. Heating element according to claim 1, characterized in that the heating conductor (10) is made from a piece of sheet metal. 3. Heizelement nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, daß die Stromanschlüsse (11, 12) gekröpft angeordnet sind (Fig. 2). 3. Heating element according to claims 1 and 2, characterized in that that the power connections (11, 12) are cranked (Fig. 2). 4. Heizelement nach den Ansprüchen 1 bis 3, dadurch gekennzeichnet, daß der Heizleiter (10) aus niedriggekohltem Chrom-Nickel-Stahl besteht. 4. Heating element according to claims 1 to 3, characterized in that that the heating conductor (10) consists of low-carbon chromium-nickel steel. 5. Heizelement nach den Ansprüchen 1 bis 4, dadurch gekennzeichnet, daß der Heizleiter (10) auf einer starren isolierten, vorzugsweise gut wärmeleitenden Unterlage (14) aufliegt und beweglich gelagert ist. 5. Heating element according to claims 1 to 4, characterized in that that the heating conductor (10) on a rigid insulated, preferably good heat conductor Support (14) rests and is movably mounted. 6. Heizelement nach den Ansprüchen 1 bis 5, dadurch gekennzeichnet, daß die Unterlage(14) des Heizleiters (10) in an sich bekannter Weise von einem Kühlmittel, z. B. Wasser oder Luft, durchflossen ist. 6. Heating element according to claims 1 to 5, characterized in that that the base (14) of the heating conductor (10) in a known manner from a Coolant, e.g. B. water or air is flowed through. In Betracht gezogene Druckschriften: Deutsche Patentschrift Nr. 1 062 004; deutsche Auslegeschrift Nr. 1 082 042. Documents considered: German Patent No. 1 062 004; German interpretation document No. 1 082 042.
DEN18715A 1960-08-03 1960-08-03 Heating element for welding thermoplastics using heat pulse processing Pending DE1184486B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0618140A1 (en) * 1993-03-23 1994-10-05 Paper Converting Machine GmbH Device for sealing plastic bags

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1062004B (en) 1954-11-10 1959-07-23 Wolff & Co Method and device for producing a round bottom bag from a piece of tubular film made of thermoplastic material
DE1082042B (en) * 1958-08-09 1960-05-19 Supermatic Karl Maegerle Method and device for welding plastic

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1062004B (en) 1954-11-10 1959-07-23 Wolff & Co Method and device for producing a round bottom bag from a piece of tubular film made of thermoplastic material
DE1082042B (en) * 1958-08-09 1960-05-19 Supermatic Karl Maegerle Method and device for welding plastic

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0618140A1 (en) * 1993-03-23 1994-10-05 Paper Converting Machine GmbH Device for sealing plastic bags

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