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DE1078318B - Device for the separation welding of thermoplastic plastic foils with an inductively heated roller - Google Patents

Device for the separation welding of thermoplastic plastic foils with an inductively heated roller

Info

Publication number
DE1078318B
DE1078318B DEH27215A DEH0027215A DE1078318B DE 1078318 B DE1078318 B DE 1078318B DE H27215 A DEH27215 A DE H27215A DE H0027215 A DEH0027215 A DE H0027215A DE 1078318 B DE1078318 B DE 1078318B
Authority
DE
Germany
Prior art keywords
inductively heated
welding
thermoplastic plastic
heated roller
cutting edge
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
DEH27215A
Other languages
German (de)
Inventor
Franz Hartleib
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to DEH27215A priority Critical patent/DE1078318B/en
Publication of DE1078318B publication Critical patent/DE1078318B/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
    • B29C65/74—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area
    • B29C65/743—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc
    • B29C65/7435—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc the tool being a roller
    • 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
    • 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
    • B29C65/24—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools characterised by the means for heating the tool
    • B29C65/30—Electrical means
    • B29C65/32—Induction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/13—Single flanged joints; Fin-type joints; Single hem joints; Edge joints; Interpenetrating fingered joints; Other specific particular designs of joint cross-sections not provided for in groups B29C66/11 - B29C66/12
    • B29C66/133—Fin-type joints, the parts to be joined being flexible
    • 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
    • B29C66/70—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
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
    • B29C66/8341—Roller, cylinder or drum types; Band or belt types; Ball types
    • B29C66/83411—Roller, cylinder or drum types

Landscapes

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

Description

Vorrichtung zum Trennschweißen thermoplastischer Kunststoff-Folien mit einer induktiv geheizten Rolle Die Erfindung betrifft eine Vorrichtung zum Trenneiner induktiv geheizten Rolle, die eine über ihre einer induktiv geheizten Rolle, ide eine über ihre Mantelfläche vorstehende Schneide aufweist und bei der die Mantellauffläche sich in radialem Abstand von der Schneidkante an die Schneide anschließt. Device for the separation welding of thermoplastic plastic foils with an inductively heated roller The invention relates to a device for separating one inductively heated role, which one over their an inductively heated role, ide has a cutting edge protruding beyond its lateral surface and in which the lateral running surface adjoins the cutting edge at a radial distance from the cutting edge.

Bekannt sind derartige Vorrichtungen mit ebenen Mantellaufflächen, die z. B. die Form eines Zylinders mit einer geradlinigen Erzeugenden oder die Form eines Kegelstumpfes haben. Da beim Arbeiten mit der Trennschweißrolle eine solche ebene rundlaufende Fläche heißer wird als die Schneide, kann man damit dünne Folien, wie sie für Verpackungszwecke verwendet werden, nicht gleichmäßig verschweißen. Die Schweißnaht wird unregelmäßig und nicht dicht, weil die heiße Lauffläche stellenweise Löcher in die dünne Folie brennt. Such devices with flat surface running surfaces are known, the z. B. the shape of a cylinder with a rectilinear generatrix or the shape of a truncated cone. Since when working with the separating welding roller, such a flat, circumferential surface becomes hotter than the cutting edge, you can use it to apply thin foils, as they are used for packaging purposes, do not weld evenly. The weld seam is irregular and not tight, because the hot running surface in places Burns holes in the thin foil.

Von den bekannten Trennschweißrollen unterscheidet sich die Erfindung dadurch, daß die Mantellauffläche im Querschnitt, vom Grunde der Schneide ausgehend, zunächst schwach und dann stärker gewölbt nach außen verläuft. The invention differs from the known separating welding rollers in that the surface running surface in cross section, starting from the base of the cutting edge, at first weakly and then more arched outwards.

Durch dieses. gewölbte, abfallende Rollenprofil ist erreicht, daß der Druck von der kreisförmigen Schneide aus nach der Seite allmählich abnimmt, so daß die Schnittkanten lückenlos dicht verschweißt werden und jede unzulässige Beanspruchung der Folienränder, die zu einem Einreißen Veranlassung geben könnte, vermieden ist. Because of this. arched, sloping roller profile is achieved that the pressure from the circular cutting edge gradually decreases towards the side, so that the cut edges are welded tightly without gaps and any impermissible Stress on the edges of the film, which could give rise to tearing, is avoided.

Bei Hochfrequenzschweißgeräten sind Schweißelektroden mit gewölbten Flächen bekannt. Da beim Hochfrequenzschweißen die Wärme in der Grenzschicht zwischen zwei Folien erzeugt wird und der Wärmeübergang von der D ielektrizitätskonstanten des Folienmaterials abhängig ist, sind solche Schweißgeräte nicht für alle Folienarten geeignet. Aus der für Hochfrequenz schweiß geräte bekannten Form der Schweiß elektroden kann man somit keineswegs schließen, welche Formgebung für eine induktiv geheizte Trennschweißrolle richtig ist, um eine einwandfreie Verschweißung der Schneidkanten zu erzielen. In the case of high-frequency welding devices, welding electrodes are curved Known areas. Because with high frequency welding the heat in the boundary layer between two foils is generated and the heat transfer from the dielectric constant Depending on the film material, such welding devices are not suitable for all types of film suitable. From the form of welding electrodes known for high-frequency welding devices one can therefore by no means infer which shape for an inductively heated one Separation welding roller is correct to ensure proper welding of the cutting edges to achieve.

Eine Ausführungsform einer Vorrichtung gemäß der Erfindung ist in Abb 1 in Seitenansicht und in Abb. 2 in Vorderansicht vereinfacht dargestellt. An embodiment of a device according to the invention is shown in FIG Fig. 1 is shown in a side view and in Fig. 2 in a simplified front view.

Die Trennschweißrolle 1 ist auf einer Achse 5 drehbar, die in einem Block 2 eingesetzt ist. Die Rolle 2 ist mit einer vorstehenden kreisförmigen Schneide 3 versehen, an die sich beiderseits die Mantellaufflächen 4 anschließen. Die Mantellaufflächen 4 verlaufen im Querschnitt, vom Grund der Schneide ausgehend, zunächst schwach und dann stärker gewölbt nach außen. Je nach der Dicke der zu bearbeitenden Folie und je nach der Anzahl der zu verschweißenden Folie muß die Schneide 3 mehr oder weniger scharf hervortreten. Die Breite der zu bildenden Schweißnähte hängt in erster Linie von der Ausgestaltung der Laufflächen 4 ab. The separation welding roller 1 is rotatable on an axis 5, which in a Block 2 is used. The roller 2 has a protruding circular cutting edge 3, to which the outer running surfaces 4 are connected on both sides. The outer running surfaces 4 are initially weak in cross-section, starting from the base of the cutting edge then more curved outwards. Depending on the thickness of the film to be processed and depending on the number of foil to be welded, the cutting edge 3 must be more or less stand out sharply. The width of the welds to be formed depends primarily on the design of the running surfaces 4.

Beim Gebrauch wird die Wärme von dem heizbaren Block 2 an die Rollenachse 5 und von dieser an die Rolle 1 abgegeben. Die Rolle 1, die mit ihrem Laufprofil aus mehreren kreisförmigen Blechen zusammengesetzt sein kann, besteht wegen der erforderlichen Wärmeleitfähigkeit aus Metall. Dasselbe gilt für den Block 2, wenn in ihm die Heizung untergebracht ist. In use, the heat is transferred from the heatable block 2 to the roller axle 5 and delivered by this to the roll 1. The role 1 with its running profile can be composed of several circular sheets, because of the required thermal conductivity of metal. The same applies to block 2 if the heater is housed in it.

Die Vorrichtungen nach der Erfindung zeichnen sich durch leichte Handhabung und vielseitige Anwendbarkeit aus, beispielsweise können kurvenförmig verlaufende Trennschweiß ungen ausgeführt werden. Ohne Überlappungen lassen sich sehr schmale Schweißnähte herstellen, so daß man bei den Zuschnitten nur wenig Folienmaterial zuzugeben braucht. The devices according to the invention are characterized by light weight Handling and versatility from, for example, can be curved running separating welds are carried out. Without overlapping can Produce very narrow weld seams, so that only a little film material is required for the blanks needs to admit.

PATENTANSPR8CHE 1. Vorrichtung zum Trennschweißen thermoplastischer Kunststoff-Folien mit einer induktiv geheizten Rolle, die eine über ihre Mantellauffläche vorstehende Schneide aufweist, wobei die Mantellauffläche sich in radialem Abstand von der Schneidkante an die Schneide anschließt, dadurch gekennzeichnet, daß die Mantellauffläche (4) im Querschnitt, vom Grunde der Schneide (3) ausgehend, zunächst schwach und dann stärker gewölbt nach außen verläuft. PATENT CLAIMS 1. Device for cut-off welding of thermoplastic Plastic sheeting with an inductively heated roller that runs over its surface has protruding cutting edge, wherein the surface running surface is at a radial distance connects from the cutting edge to the cutting edge, characterized in that the Mantle running surface (4) in cross section, starting from the base of the cutting edge (3), initially runs weakly and then more arched outwards.

Claims (1)

2. Vorrichtung nach Anspruch 1, dadurch ge kennzeichnet, daß die Rolle (1) mit ihrem Lauf- profil aus mehreren kreisförmigen Blechen mit entsprechenden Durchmessern aufgebaut ist. 2. Apparatus according to claim 1, characterized in that the Roller (1) with its running profile made of several circular sheets is constructed with appropriate diameters. In Betracht gezogene Druckschriften: Deutsche Patentschrift Nr. 834 899; deutsches Gebrauchsmuster Nr. 1 673 783; französische Patentschrift Nr. 863 897; schweizerische Patentschrift Nr. 256 66; britische Patentschriften Nr. 602 990, 746 361; USA.-Patentschriften Nr. 2 117 452, 2 185 647, 2 589 777, 2 621 705, 2625 201, 2 675 054, 2686556. Documents considered: German Patent No. 834 899; German utility model No. 1 673 783; French patent specification No. 863 897; Swiss Patent No. 256 66; British Patent Specification No. 602 990, 746 361; U.S. Patents Nos. 2,117,452, 2,185,647, 2,589,777, 2,621,705, 2625 201, 2 675 054, 2686556.
DEH27215A 1956-06-06 1956-06-06 Device for the separation welding of thermoplastic plastic foils with an inductively heated roller Pending DE1078318B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEH27215A DE1078318B (en) 1956-06-06 1956-06-06 Device for the separation welding of thermoplastic plastic foils with an inductively heated roller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEH27215A DE1078318B (en) 1956-06-06 1956-06-06 Device for the separation welding of thermoplastic plastic foils with an inductively heated roller

Publications (1)

Publication Number Publication Date
DE1078318B true DE1078318B (en) 1960-03-24

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Application Number Title Priority Date Filing Date
DEH27215A Pending DE1078318B (en) 1956-06-06 1956-06-06 Device for the separation welding of thermoplastic plastic foils with an inductively heated roller

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Country Link
DE (1) DE1078318B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1177801B (en) * 1960-12-30 1964-09-10 Lehmacher & Sohn M Device for separating welding of thermoplastic hose or folded foils
FR2503974A1 (en) * 1981-04-08 1982-10-15 Masser Sa INDUCTION HEATING TOOL HOLDER DEVICE
EP1027981A2 (en) * 1999-02-11 2000-08-16 KALLFASS VERPACKUNGSMASCHINEN GmbH & Co. Apparatus for welding weldable films

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2117452A (en) * 1932-09-08 1938-05-17 Us Rubber Co Cut seaming machine
US2185647A (en) * 1937-08-28 1940-01-02 Edwin J Mcilvried Method and means for cutting and joining sheet material
FR863897A (en) * 1939-10-27 1941-04-11 Electric iron for soldering cellophane and the like
GB602990A (en) * 1945-11-15 1948-06-07 James White Dalgleish Method of and apparatus for cutting or trimming thermo-plastic materials
CH256616A (en) * 1942-01-14 1948-08-31 Wingfoot Corp Process for welding films of material softening under the action of heat, device for carrying out this process and article obtained by applying the process.
US2589777A (en) * 1949-07-09 1952-03-18 William F Stahl Plastic-sealing apparatus
DE834899C (en) * 1948-04-21 1952-03-24 Raytheon Mfg Co Method and device for welding thermoplastics
US2621705A (en) * 1951-04-24 1952-12-16 Norman H Nye Bagmaking apparatus
US2625201A (en) * 1949-05-10 1953-01-13 Edward W Smith Means and method of sealing plastic materials
DE1673783U (en) * 1951-04-11 1954-03-18 Lorenz C Ag DEVICE FOR SEAM WELDING OF THERMOPLASTIC FILMS.
US2675054A (en) * 1951-12-01 1954-04-13 Langer Nicholas Machine for continuously bonding thermoplastic materials
US2686556A (en) * 1950-05-31 1954-08-17 Gerber Eugene Machine for sealing thermoplastic materials
GB746361A (en) * 1954-08-30 1956-03-14 Charles Threlfall Improvements in or relating to apparatus for cutting sheet material and simultaneously sealing the cut edges

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2117452A (en) * 1932-09-08 1938-05-17 Us Rubber Co Cut seaming machine
US2185647A (en) * 1937-08-28 1940-01-02 Edwin J Mcilvried Method and means for cutting and joining sheet material
FR863897A (en) * 1939-10-27 1941-04-11 Electric iron for soldering cellophane and the like
CH256616A (en) * 1942-01-14 1948-08-31 Wingfoot Corp Process for welding films of material softening under the action of heat, device for carrying out this process and article obtained by applying the process.
GB602990A (en) * 1945-11-15 1948-06-07 James White Dalgleish Method of and apparatus for cutting or trimming thermo-plastic materials
DE834899C (en) * 1948-04-21 1952-03-24 Raytheon Mfg Co Method and device for welding thermoplastics
US2625201A (en) * 1949-05-10 1953-01-13 Edward W Smith Means and method of sealing plastic materials
US2589777A (en) * 1949-07-09 1952-03-18 William F Stahl Plastic-sealing apparatus
US2686556A (en) * 1950-05-31 1954-08-17 Gerber Eugene Machine for sealing thermoplastic materials
DE1673783U (en) * 1951-04-11 1954-03-18 Lorenz C Ag DEVICE FOR SEAM WELDING OF THERMOPLASTIC FILMS.
US2621705A (en) * 1951-04-24 1952-12-16 Norman H Nye Bagmaking apparatus
US2675054A (en) * 1951-12-01 1954-04-13 Langer Nicholas Machine for continuously bonding thermoplastic materials
GB746361A (en) * 1954-08-30 1956-03-14 Charles Threlfall Improvements in or relating to apparatus for cutting sheet material and simultaneously sealing the cut edges

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1177801B (en) * 1960-12-30 1964-09-10 Lehmacher & Sohn M Device for separating welding of thermoplastic hose or folded foils
FR2503974A1 (en) * 1981-04-08 1982-10-15 Masser Sa INDUCTION HEATING TOOL HOLDER DEVICE
EP0063556A1 (en) * 1981-04-08 1982-10-27 Masser S.A. Inductively heated toolholder device
EP1027981A2 (en) * 1999-02-11 2000-08-16 KALLFASS VERPACKUNGSMASCHINEN GmbH & Co. Apparatus for welding weldable films
EP1027981A3 (en) * 1999-02-11 2001-07-11 KALLFASS VERPACKUNGSMASCHINEN GmbH & Co. Apparatus for welding weldable films

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