DE4333852A1 - Heizelement für Folienschweißgeräte - Google Patents

Heizelement für Folienschweißgeräte

Info

Publication number
DE4333852A1
DE4333852A1 DE4333852A DE4333852A DE4333852A1 DE 4333852 A1 DE4333852 A1 DE 4333852A1 DE 4333852 A DE4333852 A DE 4333852A DE 4333852 A DE4333852 A DE 4333852A DE 4333852 A1 DE4333852 A1 DE 4333852A1
Authority
DE
Germany
Prior art keywords
heating element
thick
heating
conductor track
thickness
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.)
Withdrawn
Application number
DE4333852A
Other languages
English (en)
Inventor
Reinhard Albrecht
Karl-Heinz Lentzy
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.)
Lust Hybrid Technik GmbH
Original Assignee
Lust Hybrid Technik GmbH
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 Lust Hybrid Technik GmbH filed Critical Lust Hybrid Technik GmbH
Priority to DE4333852A priority Critical patent/DE4333852A1/de
Publication of DE4333852A1 publication Critical patent/DE4333852A1/de
Withdrawn legal-status Critical Current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
    • B29C65/221—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip
    • B29C65/226—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip characterised by the cross-section of said heated wire, resistive ribbon, resistive band or resistive strip, e.g. being triangular
    • 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
    • B29C66/347—General aspects dealing with the joint area or with the area to be joined using particular temperature distributions or gradients; using particular heat distributions or gradients
    • B29C66/3472—General aspects dealing with the joint area or with the area to be joined using particular temperature distributions or gradients; using particular heat distributions or gradients in the plane of the joint, e.g. along the joint line in the plane of the joint or perpendicular to the joint line in the plane of the joint
    • 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
    • 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
    • B29C66/812—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
    • B29C66/81262—Electrical and dielectric properties, e.g. electrical conductivity
    • B29C66/81263—Dielectric properties
    • 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
    • B29C66/814—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 design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—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 design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81411—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 design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
    • B29C66/81421—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 design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being convex or concave
    • B29C66/81422—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 design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being convex or concave being convex
    • 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
    • B29C66/8182—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 insulating constructional aspects
    • B29C66/81821—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 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
    • B29C66/80—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
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
    • H05B3/12—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
    • H05B3/14—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic
    • H05B3/141—Conductive ceramics, e.g. metal oxides, metal carbides, barium titanate, ferrites, zirconia, vitrous compounds
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
    • H05B3/16—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor the conductor being mounted on an insulating base
    • 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
    • B29C65/225—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip being a coating or being printed, e.g. being applied as a paint or forming a printed circuit
    • 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
    • B29C66/40—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
    • B29C66/80—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
    • B29C66/90—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
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2101/00—Use of unspecified macromolecular compounds as moulding material
    • B29K2101/12—Thermoplastic materials

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Surface Heating Bodies (AREA)

Description

Die Erfindung betrifft ein elektrisches Heizelement für Folienschweißgeräte. Solche Geräte werden in Industrie und Haushalt zum Verschweißen zweier oder auch mehrerer auf einer ebenen Unterlage ausgebreiteter Folien aus thermoplastischen Polymerwerkstoffen verwendet auf die das Heizelement kurzzeitig, mit mäßigem Druck aufge­ setzt wird.
Dabei tritt das Problem auf, die Wärmeverteilung des Heizleiters so zu steuern, daß einerseits im Interesse der Produktivität in möglichst kurzer Taktzeit eine fe­ ste und dichte Schweißnaht entsteht, andererseits die beteiligten dünnen Folien nicht zu zerstören, wobei es durchaus erforderlich sein kann, die Folien unmit­ telbar neben der Schweißnaht durch entsprechend stär­ kere Wärmeeinwirkung abzutrennen.
Zur Erfüllung der letztgenannten Anforderung ist eine Vorrichtung mit einem hochkant gestellten streifenför­ migen massiven metallischen Heizleiter bekannt gewor­ den (DE GM 85 11 950), die keinerlei Möglichkeit zur Steuerung der Temperaturverteilung aufweist. Des weite­ ren hat sich herausgestellt, daß draht- und bandförmige massive Heizleiter eine zu geringe Standzeit haben.
Man hat die geschilderten Probleme auch mechanisch über die Andrückkraft zu lösen gesucht, indem beispielsweise die Auflagefläche der Folien elastisch ausgestaltet wurde (DE GM 83 22 750) oder indem als Heizleiter Dick­ schichtleiterbahnen auf einem Keramikgrundkörper in un­ terschiedlicher Höhe angebracht wurden (DE OS 34 09 925). Eine Vergleichmäßigung der Arbeitstemperatur ins­ besondere in den Randbereichen des Heizleiters oder eine gesteuerte Differenzierung derselben, wenn beispielsweise unterschiedliche Folienlagenzahlen zu verbinden sind, läßt sich dadurch nicht erreichen.
Diese Forderungen erfüllt eine bekannte Vorrichtung, bei der der Heizkörper in mehrere Heizelemente unter­ teilt ist, die jeweils einzeln in Abhängigkeit von der mit Temperaturfühlern erfaßten Folientemperatur gere­ gelt werden (DE GM 90 12 666). Diese technische Lösung ist sehr kompliziert und kostspielig sowie nur bei sehr großen, nicht im Haushalt benutzbaren Geräten anwend­ bar.
Der Erfindung liegt daher die Aufgabe zugrunde, ein einfaches und wenig aufwendiges Heizelement für Folien­ schweißgeräte zu schaffen, dessen Temperatur bzw. Heiz­ leistung in seiner Längsrichtung unterschiedlich ist und das mit geringer thermischer Trägheit bei hoher Taktfrequenz ohne zusätzliche Antihaftfolien zu arbei­ ten vermag.
Diese Aufgabe wird durch die in den Patentansprüchen beschriebene Erfindung gelöst.
Die partielle Variation der Dickschichtleiterbahn hin­ sichtlich ihrer Breite und/oder Dicke ermöglicht die Einstellung eines beliebigen, den jeweiligen Anforde­ rungen entsprechenden Temperaturverlaufs.
Die Unterschichtung der als Heizer wirksamen Dick­ schichtleiterbahn mit einer elektrisch und thermisch isolierenden Schicht hemmt die Wärmeausbreitung in den Keramikgrundkörper, wodurch Aufheizen und Abkühlen in unmittelbarer Nähe der zu verschweißenden Folien schneller vonstatten gehen. Dadurch werden höhere Pro­ duktionstaktfrequenzen möglich, das Heizelement wird geschont und Energie eingespart.
Die Variation der Dicke dieser elektrisch und thermisch isolierenden Unterschichtung schafft mit der Variation der Wärmeleitung in den Keramikgrundkörper hinein einen weiteren Freiheitsgrad für die Variation bzw. Beein­ flussung von umgesetzter Leistung und Temperatur in Längsrichtung des Heizelements.
Die Ausführung in Dickschichttechnologie ermöglicht mittels verwandter technologischer Verfahren die Auf­ bringung einer Antihaftschicht, wodurch sich die Ver­ wendung von Antihaftfolien als Verbrauchsmaterial erüb­ rigt.
Die Anbringung der erwähnten Schichten auf einer konvex gewölbten Fläche des Keramikgrundkörpers ergibt eine mechanisch feste Anordnung, wobei durch den wesentlich schmaleren erhabenen Heizleiter dennoch eine scharf begrenzte Schweißnaht erzielt wird.
Die Erfindung wird nachstehend anhand der beigefügten Zeichnung in Schnittdarstellung an einem Ausführungsbeispiel näher erläutert.
Ein Keramikgrundkörper 1 aus Aluminiumoxidkeramik, die eine Wärmeleitfähigkeit in der Größenordnung von W/m*K hat, ist mit einer 0,02 . . . 0,06 mm dicken Schicht 2 aus dielektrischem Material bedruckt, deren Wärmeleitfähigkeit mindestens eine Größenordnung nied­ riger ist. Darauf befindet sich die Dickschichtleiter­ bahn 3, deren Breite am Rand 4 mm und in der Mitte 2 mm beträgt und schließlich die Antihaftschicht 4 aus Te­ flon. Die thermische Zeitkonstante bei einer erforder­ lichen Aufheizung auf 150°C liegt in der Größenordnung von < 0,5 s.

Claims (4)

1. Heizelement für Folienschweißgeräte mit einer Dick­ schichtleiterbahn als Heizleiter auf einem Keramik­ grundkörper, dadurch gekennzeichnet, daß die Dick­ schichtleiterbahn (3) in ihrer Längsrichtung hinsicht­ lich ihrer Breite und/oder Dicke variiert ist.
2. Heizelement nach Anspruch 1, dadurch gekennzeichnet, daß die Dickschichtleiterbahn (3) zumindest teilweise mit einer thermisch und elektrisch isolierenden Schicht (2) unterlegt ist.
3. Heizelement nach Anspruch 3, dadurch gekennzeichnet, daß die thermisch und elektrisch isolierende Schicht (2) gleichfalls hinsichtlich ihrer Dicke variiert ist.
4. Heizelement nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß sich die Anordnung der Schichten (2; 3; 4) auf einer konvex gewölbten Fläche des Keramikgrundkörpers (1) befindet.
DE4333852A 1993-09-23 1993-09-23 Heizelement für Folienschweißgeräte Withdrawn DE4333852A1 (de)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19737471A1 (de) * 1997-08-28 1999-03-11 Robert Dipl Ing Peters Heizeinrichtung
DE19820141A1 (de) * 1998-05-06 1999-11-25 Ego Elektro Geraetebau Gmbh Elektrische Zündvorrichtung, insbesondere für einen Zigarettenanzünder
DE19843481C1 (de) * 1998-09-22 2000-05-04 Fresenius Medical Care De Gmbh Verfahren und Vorrichtung zum Verschweißen einer Folie
WO2001008463A3 (en) * 1999-07-30 2002-02-28 Northcoast Technologies Aircraft de-icing system
DE10204968A1 (de) * 2002-02-06 2003-08-14 Fresenius Medical Care De Gmbh Behälter zum Befüllen mit einer Flüssigkeit, Verfahren zum Herstellen eines derartigen Behälters und Schweißwerkzeug zum Durchführen des Herstellungsverfahrens
DE102012215105A1 (de) 2011-08-30 2013-02-28 Bielomatik Leuze Gmbh + Co. Kg Vorrichtung zum Wärmeimpulsschweißen
WO2013132069A1 (de) * 2012-03-08 2013-09-12 Bielomatik Leuze Gmbh + Co. Kg Heizelement
EP3241666A1 (de) * 2016-05-04 2017-11-08 ROPEX Industrie-Elektronik GmbH Heizeinrichtung
WO2018055034A1 (de) * 2016-09-21 2018-03-29 watttron GmbH Siegelorgan

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19737471A1 (de) * 1997-08-28 1999-03-11 Robert Dipl Ing Peters Heizeinrichtung
DE19737471C2 (de) * 1997-08-28 2002-03-07 Robert Peters Heizeinrichtung
DE19820141A1 (de) * 1998-05-06 1999-11-25 Ego Elektro Geraetebau Gmbh Elektrische Zündvorrichtung, insbesondere für einen Zigarettenanzünder
DE19843481C1 (de) * 1998-09-22 2000-05-04 Fresenius Medical Care De Gmbh Verfahren und Vorrichtung zum Verschweißen einer Folie
WO2001008463A3 (en) * 1999-07-30 2002-02-28 Northcoast Technologies Aircraft de-icing system
DE10204968A1 (de) * 2002-02-06 2003-08-14 Fresenius Medical Care De Gmbh Behälter zum Befüllen mit einer Flüssigkeit, Verfahren zum Herstellen eines derartigen Behälters und Schweißwerkzeug zum Durchführen des Herstellungsverfahrens
DE102012215105A1 (de) 2011-08-30 2013-02-28 Bielomatik Leuze Gmbh + Co. Kg Vorrichtung zum Wärmeimpulsschweißen
WO2013030114A1 (de) 2011-08-30 2013-03-07 Bielomatik Leuze Gmbh + Co. Kg VORRICHTUNG ZUM WÄRMEIMPULSSCHWEIßEN
WO2013132069A1 (de) * 2012-03-08 2013-09-12 Bielomatik Leuze Gmbh + Co. Kg Heizelement
EP3241666A1 (de) * 2016-05-04 2017-11-08 ROPEX Industrie-Elektronik GmbH Heizeinrichtung
WO2018055034A1 (de) * 2016-09-21 2018-03-29 watttron GmbH Siegelorgan
EP3515693B1 (de) 2016-09-21 2020-07-01 watttron GmbH Siegelorgan
US11667421B2 (en) 2016-09-21 2023-06-06 watttron GmbH Sealing body

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