DE2228094A1 - Welding thermoplastic film - using a flexible heated welding plate - Google Patents

Welding thermoplastic film - using a flexible heated welding plate

Info

Publication number
DE2228094A1
DE2228094A1 DE2228094A DE2228094A DE2228094A1 DE 2228094 A1 DE2228094 A1 DE 2228094A1 DE 2228094 A DE2228094 A DE 2228094A DE 2228094 A DE2228094 A DE 2228094A DE 2228094 A1 DE2228094 A1 DE 2228094A1
Authority
DE
Germany
Prior art keywords
welding
plate
punch
welding plate
stamp
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
DE2228094A
Other languages
German (de)
Inventor
Ernst Dr Bischoff
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.)
Robert Bosch Verpackungsmaschinen GmbH
Original Assignee
Robert Bosch Verpackungsmaschinen 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 Robert Bosch Verpackungsmaschinen GmbH filed Critical Robert Bosch Verpackungsmaschinen GmbH
Priority to DE2228094A priority Critical patent/DE2228094A1/en
Publication of DE2228094A1 publication Critical patent/DE2228094A1/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
    • B65B51/10—Applying or generating heat or pressure or combinations thereof
    • B65B51/14—Applying or generating heat or pressure or combinations thereof by reciprocating or oscillating members
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—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
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • 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
    • B29C66/131—Single flanged joints, i.e. one of the parts to be joined being rigid and flanged in the joint area
    • 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
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/53—Joining single elements to tubular articles, hollow articles or bars
    • B29C66/534—Joining single elements to open ends of tubular or hollow articles or to the ends of bars
    • B29C66/5346—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially flat
    • B29C66/53461—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially flat joining substantially flat covers and/or substantially flat bottoms to open ends of container bodies
    • 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
    • B29C66/81431—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 comprising a single cavity, e.g. a groove
    • 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
    • B29C66/816—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 mounting of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8161—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 mounting of the pressing elements, e.g. of the welding jaws or clamps said pressing elements being supported or backed-up by springs or by resilient material
    • 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
    • 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
    • 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
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • 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
    • B29C66/84—Specific machine types or machines suitable for specific applications
    • B29C66/849—Packaging machines
    • 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
    • B29C65/305—Electrical means involving the use of cartridge heaters

Landscapes

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

Abstract

The welding plate is of 2mm steel of Al carrying a heating strip between two insulating layers. Further layers of asbestos and silicone rubber are provided to give thermal insulation and resilience between the welding plate and its rigid mounting. Welding is applied evenly over the materials and prevents any weak or unwelded points, without using pressures which would damage the thermoplastic films materials. Designed for such applications as welding a lid to a container.

Description

Vorrichtung zum flächenförmigen Verschweißen von Folien Die Erfindung bezieht sich auf eine Vorrichtung zum flächenförmigen Verschweißen zweier auSeinanderliegender Folienlagen aus thermoplastischem Kunststoff oder mit einem schareiB-oder heißsiegelfähigen Material beschichteter Folienlagen mit einem beheizten Schweißstempel und einem relativ bewegbaren starren Gegenstempel.Device for the sheet-like welding of foils The invention relates to a device for the sheet-like welding of two mutually lying Foil layers made of thermoplastic material or with a sharp or heat sealable one Material of coated film layers with a heated welding stamp and a relatively movable rigid counter punch.

Zum Verschließen von Packungseinheiten mit in einer thermoplastischen Folie in mehreren Reihe und Zeilen eingeformten Näpfchen mit einer schweißbaren oder heißsiegelfähigen Deckfolie ist bereits eine Vorrichtung mit einem plattenförmigen, beheizten Stempel und einem ebenfalls plattenförmigen Gegen stempel bekannt geworden, welche zum Verschweißen der dazwischen eingeführten Folienlagen relativ gegeneinanderbewegt und -gedrückt werden. Der mit eingesetzten, elektrischen Heizpatronen beheizte Stempel ist starr und hat eine ebene Schweißfläche. Ebenso ist der Gegenstempel starr und hat eine ebene Stempeifläche, in der Ausnehmungen entsprechend den Näpfchen einer Verpackungseinheit angeordnet sind. Durch das Beheizen des Schweißstempels kommen in ibl Spannungen zur Wirkung, welche ihn so verziehen, daß seine Schweißfläche nicht mehr planparallel mit der des Gegenstenpeis ist. Beim Schweißen liegt daher seine Schweißfläche nur noch stellenweise satt auf der zu verschweißenden Folie auf, so daß die Deckfolie nicht mehr gleichmäßig und stellenweise überhaupt nicht mit der Unterfolie verschweißt wird. Man hat daher versucht, diesen Nachteil durch Nachschleifen der Schweißfläche des Siegelstempels in erwärmtem Zustand auszuschalten. Dies hat jedoch nur Erfolg, wenn der Siegelstetapel stets die gleiche Arbeitstemperatur hat. Ferner hat man die Schließkraft der Werkzeuge so erhöht, daß der llarneverzug bei jedem Schweißvorgang ausgeglichen wurde. Dieses Verfahren geht jedoch auf Kosten der Schonung der zu verschweißenden Folien.For closing packaging units with in a thermoplastic Foil molded in several rows and rows with a weldable cell or heat-sealable cover film is already a device with a plate-shaped, heated stamp and a plate-shaped counter stamp become known, which are moved relative to one another for welding the film layers inserted between them and be pressed. The stamp heated with inserted, electric heating cartridges is rigid and has a flat welding surface. The counter punch is also rigid and has a flat stamped surface, in the recesses corresponding to the wells of a Packaging unit are arranged. Come by heating the welding stamp in ibl tensions to effect, which warp him so that his welding surface is no longer plane-parallel with that of the counter food. When welding is therefore its welding surface is only saturated in places on the foil to be welded so that the cover sheet is no longer uniform and not at all in places is welded to the lower film. Attempts have therefore been made to overcome this disadvantage Switch off regrinding of the welding surface of the sealing die in the heated state. However, this is only successful if the stack of seals is always at the same working temperature Has. Furthermore, the clamping force of the tools has been increased so that there is no delay with every welding process was balanced. This procedure works but at the expense of protecting the foils to be welded.

Aufgabe vorliegender Erfindung ist es, eine Vorrichtung der eingangs erwärmten Art zu schaffen, bei der die Folien auf ihrer gesamten Fläche gleichmäßig miteinander verschweißt werden.The object of the present invention is to provide a device of the initially mentioned to create a heated type in which the foils are evenly distributed over their entire surface are welded together.

Diese Aufgabe wird nach der Erfindung dadurch gelöst, daß der Schweißstempel eine flexible Schweißplatte hat, welche unter Zwischenschaltung einer elastischen Zwischenlage gegen einen starren Stempelkörper gespannt ist, und daß ein flächenförmiges Heizelement isoliert z#wischen der Schweißplatte und der nachgiebigen Lage angeordnet ist.This object is achieved according to the invention in that the welding stamp has a flexible welding plate, which with the interposition of an elastic Intermediate layer is stretched against a rigid stamp body, and that a sheet-like one Heating element insulated between the welding plate and the flexible layer is.

Mit dieser Vorrichtung lassen sich beim Schweißen auch Dickenschwankungen in den Folienlagen ausgleichen.With this device, fluctuations in thickness can also be made during welding equalize in the film layers.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher beschrieben.An embodiment of the invention is shown in the drawing and is described in more detail below.

Es zeigen: Fig. i eine Siegelvorrichtung in Seitenansicht und Fig. 2 einen Siegelstempel der Siegelvorrichtung nach Fig. 1 in schaubildlicher Darstellung stufenweise geschnitten.They show: FIG. 1 a sealing device in side view and FIG. 2 shows a sealing stamp of the sealing device according to FIG. 1 in a diagrammatic representation cut in stages.

Zwischen einen oberen Schweißstempel 10 und einen unteren Gegenstempel 11 werden zwei auSinanderliegende Folienbahnen 1 und 2 schrittweise zugeführt. Die untere Folienbahn 1, welche aus einem thermoplastischen Kunststoff besteht, hat nach unten ausgeformte Näpfe 3, in die Tabletten als DEillgut eingelegt sind. Jeweils drei Näpfe 3 in einer Reihe hintereinander und mehrere in Zeilen nebeneinander bilden eine Einheit. Between an upper welding punch 10 and a lower counter punch 11 two spaced apart film webs 1 and 2 are fed step by step. the lower film web 1, which consists of a thermoplastic material has downwardly shaped wells 3, in which tablets are inserted as DEillgut. Respectively form three wells 3 in a row one behind the other and several in rows next to one another one unity.

Die auf die untere Folienbahn 1 aufgelegte Folienbahn 2 ist eine dünne Aluminiumfolie, welche auf ihrer der unteren Folienbahn 1 zugewandten Seite mit thermoplastischem Kunststoff oder mit einem heißsiegelfähigen Lack beschichtet ist. The film web 2 placed on the lower film web 1 is a thin aluminum foil, which on its side facing the lower foil web 1 coated with thermoplastic or with a heat-sealable lacquer is.

Der Gegenstempel 11, der taktweise auf- und abbewegt wird, besteht aus einem starren, plattenförmigen Körper mit einer Stempelfläche 12, deren Abmessungen denen einer Einheit von Näpfchen 3 in der Folienbahn 1 entsprechen. In seiner Stempelfläche 12 hat er Ausnehmungen 13, deren Größe und deren Anordnung den Näpfchen 3 einer Einheit entsprechen. The counter punch 11, which is cyclically moved up and down, exists from a rigid, plate-shaped body with a stamp surface 12, the dimensions of which correspond to those of a unit of cells 3 in the film web 1. In its stamp area 12 it has recesses 13, the size and arrangement of which the wells 3 one Unit.

Der Schweißstempel 10, welcher ortsfest über dem Gegenstempel 11 angeordnet ist, hat zuoberst einen starren, plattenförmigen Grundkörper 15 und zuunterst eine flexible, etwa 2 mm dicke Platte 16 aus Stahl oder Aluminium mit einer nach unten weisenden Schweißfläche 14. Auf der Platte 16 ist zwischen zwei dünnen, elektrisch isolierenden Lage 17, 18 ein elektrischer, bandförmiger Heizleiter 19 in Schlingen so verlegt, daß die Platte 16 in ihrem gesamten Bereich gleichförmig erhitzt wird. The welding punch 10, which is stationary above the counter punch 11 is arranged, has a rigid, plate-shaped base body 15 at the top and at the bottom a flexible, about 2 mm thick plate 16 made of steel or aluminum with a after downward facing welding surface 14. On the plate 16 is between two thin, electrically insulating layer 17, 18 an electrical, band-shaped heating conductor 19 laid in loops so that the plate 16 is uniform over its entire area is heated.

Zwischen der oberen isolierenden Lage 18 und dem Grundl#örl?er 15 sind unten eine etwa 5 mm dicke, wärmeisolierende Platte 20 aus Asbest und darüber eine etwa 5 mm dicke, elastische Platte 21 aus Silikonkautschuk eingelegt. Die verschiedenen Platten 16, 20, 21 und Lagen 17, 18 sowie der Heizleiter 19 werden von sie durchsetzenden Schrauben 23 getragen und federnd gegen die Unterseite des Grundkörpers 15 gespannt. Dazu sind auf die durch den Grundkörper 15 durchragenden Enden der Schrauben 23 Druckfedern 24 aufgesteckt, welche sich auf der Oberseite des Grundkörpers 15 und an Muttern 25 abstützen, welche auf die Schrauben 23 aufgeschraubt sind. Zum Verschweißen einer Einheit mit Näpfchen 3 der unteren Folienbahn 2 mit der oberen Folienbahn 1 wird der Gegenstempel 11 jeweils nach oben bewegt und während einer bestimmten Zeitdauer gegen den Schweißstempel 10 mit einer bestimmten Kraft gepreßt. Dabei verschweißen die beiden Folienbahnen 1 und 2 in den Bereichen rings um die Näpfchen 3 unter der Einwirkung von Druck und der von der Platte 16 übertragenen Wårme. Der Gegenstempel 11 kann eine Kühl einrichtung haben, so daß er sich während einer längeren Arbeitszeit nicht aufheizen kann.Between the upper insulating layer 18 and the base layer 15 are below an approximately 5 mm thick, heat-insulating plate 20 made of asbestos and above an approximately 5 mm thick, elastic plate 21 made of silicone rubber is inserted. The different Plates 16, 20, 21 and layers 17, 18 and the heating conductor 19 are penetrated by them Screws 23 carried and tensioned resiliently against the underside of the base body 15. For this purpose, the ends of the screws 23 protruding through the base body 15 Compression springs 24 attached, which are on the top of the base body 15 and Support on nuts 25 which are screwed onto the screws 23. For welding a unit with cells 3 of the lower film web 2 with the upper film web 1, the counter punch 11 is moved upwards and during a certain Time period pressed against the welding die 10 with a certain force. Included weld the two film webs 1 and 2 in the areas around the cells 3 under the action of pressure and the heat transferred from the plate 16. Of the Counter punch 11 can have a cooling device so that it can be used for a long time Working hours cannot heat up.

Die Abmessungen des Schweißstempels 10 bzw. seiner dem Gegenstempel 1 zugewandten Schweißfläche 14 sind etwas größer als die Stempelfläche 12 des Gegenstempels 11 bzw. einer Näpfchen einheit, so daß seine Randbereiche, in denen die Schrauben 23 liegen, außerhalb der eigentlichen Schweißfläche liegen.The dimensions of the welding punch 10 or its counter punch 1 facing welding surface 14 are slightly larger than the punch surface 12 of the counter punch 11 or a cup unit, so that its edge areas in which the screws 23 lie outside the actual welding area.

Ansprüche:Expectations:

Claims (3)

Ansprüche 1. Vorrichtung zum flächenförmigen Verschweißen zweier aufeinanderliegender Folienlagen aus thermoplastischem Kunststoff oder mit einem schweiß- oder heißsiegelfähigen Materm81 beschichteter Folienlagen mit einem beheizten Schweißstempel und einem relativ bewegbaren starren Gegenstempel, dadurch gekennzeichnet, daß der Schweißstempel (10) eine flexible Schweißplatte (16) hat, welche unter Zwischenschaltung einer elastischen Zwischenlage (20, 21) gegen einen starren Stempelkörper (15) gespannt ist, und daß ein flächenförmiges Heizelement (19) isoliert zwischen der Schweißplatte und der nachgiebigen Lage angeordnet ist. Claims 1. Device for the two-dimensional welding of two superimposed film layers made of thermoplastic material or with a weldable or heat-sealable Materm81 coated film layers with a heated Welding punch and a relatively movable rigid counter-punch, characterized in that that the welding stamp (10) has a flexible welding plate (16) which is interposed an elastic intermediate layer (20, 21) stretched against a rigid stamp body (15) is, and that a sheet-like heating element (19) insulates between the welding plate and the compliant sheet is arranged. 2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Schweißplatte (16) aus einer etwa 2 mm dicken Platte aus Metall besteht.2. Apparatus according to claim 1, characterized in that the welding plate (16) consists of an approximately 2 mm thick plate made of metal. 3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß die Schweißplatte (16), das Heizelement (19) und die elastische Zwischenlage (20, 21) mit vorgespannten Befestigungselementen (23, 25) gegen den Stempelkörper (15) gespannt werden.$ L e e r s e i t e3. Apparatus according to claim 2, characterized in that the welding plate (16), the heating element (19) and the elastic intermediate layer (20, 21) with pre-tensioned Fastening elements (23, 25) are clamped against the punch body (15). $ L. e e r e i t e
DE2228094A 1972-06-09 1972-06-09 Welding thermoplastic film - using a flexible heated welding plate Pending DE2228094A1 (en)

Priority Applications (1)

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DE2228094A DE2228094A1 (en) 1972-06-09 1972-06-09 Welding thermoplastic film - using a flexible heated welding plate

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Application Number Priority Date Filing Date Title
DE2228094A DE2228094A1 (en) 1972-06-09 1972-06-09 Welding thermoplastic film - using a flexible heated welding plate

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DE2228094A1 true DE2228094A1 (en) 1973-12-20

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004041643A2 (en) * 2002-11-06 2004-05-21 Cfs Germany Gmbh Resistance heating
EP1854619A2 (en) 2006-05-11 2007-11-14 UHLMANN PAC-SYSTEME GmbH & Co. KG Sealing tool for sealing foils in a sealing station

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004041643A2 (en) * 2002-11-06 2004-05-21 Cfs Germany Gmbh Resistance heating
WO2004041643A3 (en) * 2002-11-06 2004-07-08 Cfs Germany Gmbh Resistance heating
EP1854619A2 (en) 2006-05-11 2007-11-14 UHLMANN PAC-SYSTEME GmbH & Co. KG Sealing tool for sealing foils in a sealing station
DE102006022264A1 (en) * 2006-05-11 2007-11-15 Uhlmann Pac-Systeme Gmbh & Co. Kg Sealing tool for sealing foils in a sealing station
DE102006022264B4 (en) * 2006-05-11 2008-04-03 Uhlmann Pac-Systeme Gmbh & Co. Kg Sealing tool for sealing foils in a sealing station
EP1854619A3 (en) * 2006-05-11 2008-10-01 UHLMANN PAC-SYSTEME GmbH & Co. KG Sealing tool for sealing foils in a sealing station
US7597776B2 (en) 2006-05-11 2009-10-06 Uhlmann Pac-Systeme Gmbh & Co. Kg Seal tool for film-sealing machine

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